escargot/src/parser/esprima_cpp/esprima.cpp

/*
 * Copyright (c) 2016-present Samsung Electronics Co., Ltd
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include "Escargot.h"
#include "esprima.h"
#include "interpreter/ByteCode.h"
#include "parser/ast/AST.h"
#include "parser/CodeBlock.h"
#include "double-conversion.h"
#include "ieee.h"

#include "wtfbridge.h"

using namespace JSC::Yarr;

namespace Escargot {

namespace esprima {

enum Token {
    BooleanLiteralToken = 1,
    EOFToken = 2,
    IdentifierToken = 3,
    KeywordToken = 4,
    NullLiteralToken = 5,
    NumericLiteralToken = 6,
    PunctuatorToken = 7,
    StringLiteralToken = 8,
    RegularExpressionToken = 9,
    TemplateToken = 10
};

enum PlaceHolders {
    ArrowParameterPlaceHolder
};

enum PunctuatorsKind {
    LeftParenthesis,
    RightParenthesis,
    LeftBrace,
    RightBrace,
    Period,
    PeriodPeriodPeriod,
    Comma,
    Colon,
    SemiColon,
    LeftSquareBracket,
    RightSquareBracket,
    GuessMark,
    Wave,
    UnsignedRightShift,
    RightShift,
    LeftShift,
    Plus,
    Minus,
    Multiply,
    Divide,
    Mod,
    ExclamationMark,
    StrictEqual,
    NotStrictEqual,
    Equal,
    NotEqual,
    LogicalAnd,
    LogicalOr,
    PlusPlus,
    MinusMinus,
    BitwiseAnd,
    BitwiseOr,
    BitwiseXor,
    LeftInequality,
    RightInequality,
    InPunctuator,
    InstanceOfPunctuator,

    Substitution,
    UnsignedRightShiftEqual,
    RightShiftEqual,
    LeftShiftEqual,
    PlusEqual,
    MinusEqual,
    MultiplyEqual,
    DivideEqual,
    ModEqual,
    // ExclamationMarkEqual,
    BitwiseAndEqual,
    BitwiseOrEqual,
    BitwiseXorEqual,
    LeftInequalityEqual,
    RightInequalityEqual,
    SubstitutionEnd,

    Arrow,
    PunctuatorsKindEnd,
};

enum KeywordKind {
    NotKeyword,
    If,
    In,
    Do,
    Var,
    For,
    New,
    Try,
    This,
    Else,
    Case,
    Void,
    With,
    Enum,
    Await,
    While,
    Break,
    Catch,
    Throw,
    Const,
    Class,
    Super,
    Return,
    Typeof,
    Delete,
    Switch,
    Export,
    Import,
    Default,
    Finally,
    Extends,
    Function,
    Continue,
    Debugger,
    InstanceofKeyword,
    StrictModeReservedWord,
    Implements,
    Interface,
    Package,
    Private,
    Protected,
    Public,
    Static,
    Yield,
    Let,
    KeywordKindEnd
};

ALWAYS_INLINE bool isDecimalDigit(char16_t ch)
{
    return (ch >= '0' && ch <= '9'); // 0..9
}

ALWAYS_INLINE bool isHexDigit(char16_t ch)
{
    return isDecimalDigit(ch) || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F');
}

ALWAYS_INLINE bool isOctalDigit(char16_t ch)
{
    return (ch >= '0' && ch < '8'); // 0..7
}

ALWAYS_INLINE char16_t octalValue(char16_t ch)
{
    ASSERT(isOctalDigit(ch));
    return ch - '0';
}

ALWAYS_INLINE uint8_t toHexNumericValue(char16_t ch)
{
    return ch < 'A' ? ch - '0' : (ch - 'A' + 10) & 0xF;
}

struct ParserCharPiece {
    char16_t data[3];
    size_t length;

    ParserCharPiece(const char16_t a)
    {
        data[0] = a;
        data[1] = 0;
        length = 1;
    }

    ParserCharPiece(const char32_t a)
    {
        if (a < 0x10000) {
            data[0] = a;
            data[1] = 0;
            length = 1;
        } else {
            data[0] = (char16_t)(0xD800 + ((a - 0x10000) >> 10));
            data[1] = (char16_t)(0xDC00 + ((a - 0x10000) & 1023));
            data[2] = 0;
            length = 2;
        }
    }

    ParserCharPiece(const char16_t a, const char16_t b)
    {
        data[0] = a;
        data[1] = b;
        data[2] = 0;
        length = 2;
    }
};

// ECMA-262 11.6 Identifier Names and Identifiers
ALWAYS_INLINE ParserCharPiece fromCodePoint(char32_t cp)
{
    if (cp < 0x10000) {
        return ParserCharPiece((char16_t)cp);
    } else {
        return ParserCharPiece((char16_t)(0xD800 + ((cp - 0x10000) >> 10)), (char16_t)(0xDC00 + ((cp - 0x10000) & 1023)));
    }
}

extern bool isIdentifierPartData[0x10000];
extern bool isIdentifierStartData[0x10000];

ALWAYS_INLINE bool isIdentifierPart(char32_t ch)
{
    return ch < 0x10000 && isIdentifierPartData[ch];
}

ALWAYS_INLINE bool isIdentifierStart(char32_t ch)
{
    return ch < 0x10000 && isIdentifierStartData[ch];
}

struct Curly {
    char m_curly[4];
    Curly() {}
    Curly(const char curly[4])
    {
        m_curly[0] = curly[0];
        m_curly[1] = curly[1];
        m_curly[2] = curly[2];
        m_curly[3] = curly[3];
    }
};

namespace Messages {
const char* UnexpectedToken = "Unexpected token %s";
const char* UnexpectedTokenIllegal = "Unexpected token ILLEGAL";
const char* UnexpectedNumber = "Unexpected number";
const char* UnexpectedString = "Unexpected string";
const char* UnexpectedIdentifier = "Unexpected identifier";
const char* UnexpectedReserved = "Unexpected reserved word";
const char* UnexpectedTemplate = "Unexpected quasi %s";
const char* UnexpectedEOS = "Unexpected end of input";
const char* NewlineAfterThrow = "Illegal newline after throw";
const char* InvalidRegExp = "Invalid regular expression";
const char* UnterminatedRegExp = "Invalid regular expression: missing /";
const char* InvalidLHSInAssignment = "Invalid left-hand side in assignment";
const char* InvalidLHSInForIn = "Invalid left-hand side in for-in";
const char* InvalidLHSInForLoop = "Invalid left-hand side in for-loop";
const char* MultipleDefaultsInSwitch = "More than one default clause in switch statement";
const char* NoCatchOrFinally = "Missing catch or finally after try";
const char* UnknownLabel = "Undefined label \'%s\'";
const char* Redeclaration = "%s \'%s\' has already been declared";
const char* IllegalContinue = "Illegal continue statement";
const char* IllegalBreak = "Illegal break statement";
const char* IllegalReturn = "Illegal return statement";
const char* StrictModeWith = "Strict mode code may not include a with statement";
const char* StrictCatchVariable = "Catch variable may not be eval or arguments in strict mode";
const char* StrictVarName = "Variable name may not be eval or arguments in strict mode";
const char* StrictParamName = "Parameter name eval or arguments is not allowed in strict mode";
const char* StrictParamDupe = "Strict mode function may not have duplicate parameter names";
const char* StrictFunctionName = "Function name may not be eval or arguments in strict mode";
const char* StrictOctalLiteral = "Octal literals are not allowed in strict mode.";
const char* StrictLeadingZeroLiteral = "Decimals with leading zeros are not allowed in strict mode.";
const char* StrictDelete = "Delete of an unqualified identifier in strict mode.";
const char* StrictLHSAssignment = "Assignment to eval or arguments is not allowed in strict mode";
const char* StrictLHSPostfix = "Postfix increment/decrement may not have eval or arguments operand in strict mode";
const char* StrictLHSPrefix = "Prefix increment/decrement may not have eval or arguments operand in strict mode";
const char* StrictReservedWord = "Use of future reserved word in strict mode";
const char* TemplateOctalLiteral = "Octal literals are not allowed in template strings.";
const char* ParameterAfterRestParameter = "Rest parameter must be last formal parameter";
const char* DefaultRestParameter = "Unexpected token =";
const char* ObjectPatternAsRestParameter = "Unexpected token {";
const char* DuplicateProtoProperty = "Duplicate __proto__ fields are not allowed in object literals";
const char* ConstructorSpecialMethod = "Class constructor may not be an accessor";
const char* DuplicateConstructor = "A class may only have one constructor";
const char* StaticPrototype = "Classes may not have static property named prototype";
const char* MissingFromClause = "Unexpected token";
const char* NoAsAfterImportNamespace = "Unexpected token";
const char* InvalidModuleSpecifier = "Unexpected token";
const char* IllegalImportDeclaration = "Unexpected token";
const char* IllegalExportDeclaration = "Unexpected token";
const char* DuplicateBinding = "Duplicate binding %s";
const char* ForInOfLoopInitializer = "%s loop variable declaration may not have an initializer";
}

/*
export interface Comment {
    multiLine: boolean;
    slice: number[];
    range: number[];
    loc: any;
}
*/

struct ParserError : public gc {
    String* description;
    size_t index;
    size_t line;
    size_t col;

    ParserError(size_t index, size_t line, size_t col, String* description)
    {
        this->index = index;
        this->line = line;
        this->col = col;
        this->description = description;
    }

    ParserError(size_t index, size_t line, size_t col, const char* description)
    {
        this->index = index;
        this->line = line;
        this->col = col;
        this->description = new ASCIIString(description);
    }
};

struct ScanTemplteResult {
    UTF16StringData valueCooked;
    StringView raw;
    size_t head;
    size_t tail;
};

struct ScanRegExpResult {
    String* body;
    String* flags;
};

class Scanner;

class ScannerResult : public RefCounted<ScannerResult> {
public:
    Scanner* scanner;
    Token type : 4;
    bool startWithZero : 1;
    bool octal : 1;
    bool plain : 1;
    bool head : 1;

    int prec;
    size_t lineNumber;
    size_t lineStart;
    size_t start;
    size_t end;
    size_t index;

    StringView valueString;
    KeywordKind valueKeywordKind;
    union {
        PunctuatorsKind valuePunctuatorsKind;
        double valueNumber;
        ScanTemplteResult valueTemplate;
        ScanRegExpResult valueRegexp;
    };

    ~ScannerResult();

    inline void operator delete(void* obj)
    {
    }

    inline void operator delete(void*, void*) {}
    inline void operator delete[](void* obj) {}
    inline void operator delete[](void*, void*) {}
    ScannerResult()
    {
    }

    ScannerResult(Scanner* scanner, Token type, size_t lineNumber, size_t lineStart, size_t start, size_t end)
    {
        this->scanner = scanner;
        this->type = type;
        this->startWithZero = this->octal = false;
        this->plain = false;
        this->head = false;
        this->prec = -1;
        this->valueKeywordKind = NotKeyword;
        this->lineNumber = lineNumber;
        this->valueNumber = 0;
        this->lineStart = lineStart;
        this->start = start;
        this->end = this->index = end;
    }

    ScannerResult(Scanner* scanner, Token type, StringView valueString, size_t lineNumber, size_t lineStart, size_t start, size_t end)
    {
        this->scanner = scanner;
        this->type = type;
        this->startWithZero = this->octal = false;
        this->plain = false;
        this->head = false;
        this->prec = -1;
        this->valueKeywordKind = NotKeyword;
        this->valueString = valueString;
        this->lineNumber = lineNumber;
        this->valueNumber = 0;
        this->lineStart = lineStart;
        this->start = start;
        this->end = this->index = end;
    }

    ScannerResult(Scanner* scanner, Token type, double value, size_t lineNumber, size_t lineStart, size_t start, size_t end)
    {
        this->scanner = scanner;
        this->type = type;
        this->startWithZero = this->octal = false;
        this->plain = false;
        this->head = false;
        this->valueKeywordKind = NotKeyword;
        this->valueNumber = value;
        this->lineNumber = lineNumber;
        this->lineStart = lineStart;
        this->start = start;
        this->end = this->index = end;
        if (end != SIZE_MAX) {
            this->end = end;
        }
    }

    ScannerResult(Scanner* scanner, Token type, ScanTemplteResult value, size_t lineNumber, size_t lineStart, size_t start, size_t end)
    {
        this->scanner = scanner;
        this->type = type;
        this->startWithZero = this->octal = false;
        this->plain = false;
        this->head = false;
        this->prec = -1;
        this->valueKeywordKind = NotKeyword;
        this->valueNumber = 0;
        this->valueTemplate = value;
        this->lineNumber = lineNumber;
        this->lineStart = lineStart;
        this->start = start;
        this->end = this->index = end;
        if (end != SIZE_MAX) {
            this->end = end;
        }
    }
};

class ErrorHandler : public gc {
public:
    // errors: Error[];
    // tolerant: boolean;

    ErrorHandler()
    {
        // this->errors = [];
        // this->tolerant = false;
    }

    // recordError(error: Error): void {
    //     this->errors.push(error);
    // };

    void tolerate(Error* error)
    {
        /*
        if (this->tolerant) {
            this->recordError(error);
        } else {
            throw error;
        }*/
        throw error;
    }

    Error* constructError(String* msg, size_t column)
    {
        Error* error = new (NoGC) Error(msg);
        error->column = column;
        return error;
        // try {
        //     throw error;
        // } catch (base) {
        /* istanbul ignore else */
        //     if (Object.create && Object.defineProperty) {
        //         error = Object.create(base);
        //         Object.defineProperty(error, 'column', { value: column });
        //     }
        // } finally {
        //     return error;
        // }
    }

    Error* createError(size_t index, size_t line, size_t col, String* description, ErrorObject::Code code)
    {
        UTF16StringDataNonGCStd msg = u"Line ";
        char lineStringBuf[512];
        snprintf(lineStringBuf, sizeof(lineStringBuf), "%zu", line);
        std::string lineString = lineStringBuf;
        msg += UTF16StringDataNonGCStd(lineString.begin(), lineString.end());
        msg += u": ";
        if (description->length()) {
            msg += UTF16StringDataNonGCStd(description->toUTF16StringData().data());
        }
        Error* error = constructError(new UTF16String(msg.data(), msg.length()), col);
        error->index = index;
        error->lineNumber = line;
        error->description = description;
        error->errorCode = code;
        return error;
    };

    void throwError(size_t index, size_t line, size_t col, String* description, ErrorObject::Code code)
    {
        throw this->createError(index, line, col, description, code);
    }

    void tolerateError(size_t index, size_t line, size_t col, String* description, ErrorObject::Code code)
    {
        Error* error = this->createError(index, line, col, description, code);
        /*
        if (this->tolerant) {
            this->recordError(error);
        } else {
            throw error;
        }*/
        throw error;
    }
};

#define SCANNER_RESULT_POOL_INITIAL_SIZE 128
class Scanner : public gc {
public:
    BufferedStringView source;
    ErrorHandler* errorHandler;
    // trackComment: boolean;

    size_t length;
    size_t index;
    size_t lineNumber;
    size_t lineStart;
    std::vector<Curly> curlyStack;
    bool isPoolEnabled;
    std::vector<ScannerResult*, gc_allocator<ScannerResult*>> resultMemoryPool;
    char scannerResultInnerPool[SCANNER_RESULT_POOL_INITIAL_SIZE * sizeof(ScannerResult)];

    ~Scanner()
    {
        isPoolEnabled = false;
    }


    Scanner(BufferedStringView code, ErrorHandler* handler, size_t startLine = 0, size_t startColumn = 0)
    {
        isPoolEnabled = true;
        source = code;
        errorHandler = handler;
        // trackComment = false;

        length = code.length();
        index = 0;
        lineNumber = ((length > 0) ? 1 : 0) + startLine;
        lineStart = startColumn;

        resultMemoryPool.reserve(SCANNER_RESULT_POOL_INITIAL_SIZE);
        ScannerResult* ptr = (ScannerResult*)scannerResultInnerPool;
        for (size_t i = 0; i < SCANNER_RESULT_POOL_INITIAL_SIZE; i++) {
            ptr[i].scanner = this;
            resultMemoryPool.push_back(&ptr[i]);
        }
    }

    ScannerResult* createScannerResult()
    {
        if (resultMemoryPool.size() == 0) {
            auto ret = (ScannerResult*)GC_MALLOC(sizeof(ScannerResult));
            return ret;
        } else {
            auto ret = resultMemoryPool.back();
            resultMemoryPool.pop_back();
            return ret;
        }
    }

    bool eof()
    {
        return index >= length;
    }

    void throwUnexpectedToken(const char* message = Messages::UnexpectedTokenIllegal)
    {
        this->errorHandler->throwError(this->index, this->lineNumber, this->index - this->lineStart + 1, new ASCIIString(message), ErrorObject::SyntaxError);
    }
    /*
    tolerateUnexpectedToken() {
        this->errorHandler.tolerateError(this->index, this->lineNumber,
            this->index - this->lineStart + 1, Messages.UnexpectedTokenIllegal);
    };
*/
    void tolerateUnexpectedToken()
    {
        throwUnexpectedToken();
    }
    // ECMA-262 11.4 Comments

    // skipSingleLineComment(offset: number): Comment[] {
    void skipSingleLineComment(size_t /*offset*/)
    {
        // let comments: Comment[];
        // size_t start, loc;

        /*
        if (this->trackComment) {
            comments = [];
            start = this->index - offset;
            loc = {
                start: {
                    line: this->lineNumber,
                    column: this->index - this->lineStart - offset
                },
                end: {}
            };
        }*/

        while (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index);
            ++this->index;
            if (isLineTerminator(ch)) {
                /*
                if (this->trackComment) {
                    loc.end = {
                        line: this->lineNumber,
                        column: this->index - this->lineStart - 1
                    };
                    const entry: Comment = {
                        multiLine: false,
                        slice: [start + offset, this->index - 1],
                        range: [start, this->index - 1],
                        loc: loc
                    };
                    comments.push(entry);
                }*/
                if (ch == 13 && this->source.bufferedCharAt(this->index) == 10) {
                    ++this->index;
                }
                ++this->lineNumber;
                this->lineStart = this->index;
                // return comments;
                return;
            }
        }

        /*
        if (this->trackComment) {
            loc.end = {
                line: this->lineNumber,
                column: this->index - this->lineStart
            };
            const entry: Comment = {
                multiLine: false,
                slice: [start + offset, this->index],
                range: [start, this->index],
                loc: loc
            };
            comments.push(entry);
        }*/

        // return comments;
        return;
    }

    // skipMultiLineComment(): Comment[] {
    void skipMultiLineComment()
    {
        // let comments: Comment[];
        // size_t start, loc;
        /*
        if (this->trackComment) {
            comments = [];
            start = this->index - 2;
            loc = {
                start: {
                    line: this->lineNumber,
                    column: this->index - this->lineStart - 2
                },
                end: {}
            };
        }
         */
        while (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index);
            if (isLineTerminator(ch)) {
                if (ch == 0x0D && this->source.bufferedCharAt(this->index + 1) == 0x0A) {
                    ++this->index;
                }
                ++this->lineNumber;
                ++this->index;
                this->lineStart = this->index;
            } else if (ch == 0x2A) {
                // Block comment ends with '*/'.
                if (this->source.bufferedCharAt(this->index + 1) == 0x2F) {
                    this->index += 2;
                    /*
                    if (this->trackComment) {
                        loc.end = {
                            line: this->lineNumber,
                            column: this->index - this->lineStart
                        };
                        const entry: Comment = {
                            multiLine: true,
                            slice: [start + 2, this->index - 2],
                            range: [start, this->index],
                            loc: loc
                        };
                        comments.push(entry);
                    }
                    return comments;
                    */
                    return;
                }
                ++this->index;
            } else {
                ++this->index;
            }
        }

        /*
        // Ran off the end of the file - the whole thing is a comment
        if (this->trackComment) {
            loc.end = {
                line: this->lineNumber,
                column: this->index - this->lineStart
            };
            const entry: Comment = {
                multiLine: true,
                slice: [start + 2, this->index],
                range: [start, this->index],
                loc: loc
            };
            comments.push(entry);
        }*/

        tolerateUnexpectedToken();
        // return comments;
        return;
    }

    void scanComments()
    {
        bool start = (this->index == 0);
        while (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index);

            if (isWhiteSpace(ch)) {
                ++this->index;
            } else if (isLineTerminator(ch)) {
                ++this->index;
                if (ch == 0x0D && this->source.bufferedCharAt(this->index) == 0x0A) {
                    ++this->index;
                }
                ++this->lineNumber;
                this->lineStart = this->index;
                start = true;
            } else if (ch == 0x2F) { // U+002F is '/'
                ch = this->source.bufferedCharAt(this->index + 1);
                if (ch == 0x2F) {
                    this->index += 2;
                    this->skipSingleLineComment(2);
                    start = true;
                } else if (ch == 0x2A) { // U+002A is '*'
                    this->index += 2;
                    this->skipMultiLineComment();
                } else {
                    break;
                }
            } else if (start && ch == 0x2D) { // U+002D is '-'
                // U+003E is '>'
                if ((this->source.bufferedCharAt(this->index + 1) == 0x2D) && (this->source.bufferedCharAt(this->index + 2) == 0x3E)) {
                    // '-->' is a single-line comment
                    this->index += 3;
                    this->skipSingleLineComment(3);
                } else {
                    break;
                }
            } else if (ch == 0x3C) { // U+003C is '<'
                if (this->length > this->index + 4) {
                    if (this->source.bufferedCharAt(this->index + 1) == '!'
                        && this->source.bufferedCharAt(this->index + 2) == '-'
                        && this->source.bufferedCharAt(this->index + 3) == '-') {
                        this->index += 4; // `<!--`
                        this->skipSingleLineComment(4);
                    } else {
                        break;
                    }
                } else {
                    break;
                }

            } else {
                break;
            }
        }

        return;
    }

    static bool equals(const char16_t* c1, const char* c2, size_t len)
    {
        for (size_t i = 0; i < len; i++) {
            if (c1[i] != c2[i]) {
                return false;
            }
        }

        return true;
    }

// ECMA-262 11.6.2.2 Future Reserved Words
#define STRING_CMP(str, len)                               \
    if (LIKELY(data.has8BitContent)) {                     \
        return strncmp(str, (char*)data.buffer, len) == 0; \
    } else {                                               \
        return equals((char16_t*)data.buffer, str, len);   \
    }

#define STRING_CMP2(str1, str2, len)                                                                   \
    if (LIKELY(data.has8BitContent)) {                                                                 \
        if (strncmp(str1, (char*)data.buffer, len) == 0) {                                             \
            return true;                                                                               \
        } else if (strncmp(str2, (char*)data.buffer, len) == 0) {                                      \
            return true;                                                                               \
        }                                                                                              \
    } else {                                                                                           \
        return equals((char16_t*)data.buffer, str1, len) || equals((char16_t*)data.buffer, str2, len); \
    }

    bool isFutureReservedWord(const StringView& id)
    {
        StringBufferAccessData data = id.bufferAccessData();
        if (data.length == 4) {
            STRING_CMP("enum", 4)
        } else if (data.length == 5) {
            STRING_CMP("super", 5)
        } else if (data.length == 6) {
            STRING_CMP2("export", "import", 6)
        }
        return false;
    }

    template <typename T>
    bool isStrictModeReservedWord(const T& id)
    {
        StringBufferAccessData data = id.bufferAccessData();
        switch (data.length) {
        case 3: // let
            STRING_CMP("let", 3)
            break;
        case 5: // yield
            STRING_CMP("yield", 3)
            break;
        case 6: // static public
            STRING_CMP2("static", "public", 6)
            break;
        case 7: // private package
            STRING_CMP2("private", "package", 7)
            break;
        case 9: // protected interface
            STRING_CMP2("protected", "interface", 9)
            break;
        case 10: // implements
            STRING_CMP("implements", 10)
            break;
        }

#undef STRING_CMP
#undef STRING_CMP2

        return false;
    }

    template <typename T>
    bool isRestrictedWord(const T& id)
    {
        StringBufferAccessData data = id.bufferAccessData();
        if (data.length == 4) {
            return data.equalsSameLength("eval");
        } else if (data.length == 9) {
            return data.equalsSameLength("arguments");
        } else {
            return false;
        }
    }

    // ECMA-262 11.6.2.1 Keywords
    ALWAYS_INLINE KeywordKind isKeyword(const StringBufferAccessData& data)
    {
        // 'const' is specialized as Keyword in V8.
        // 'yield' and 'let' are for compatibility with SpiderMonkey and ES.next.
        // Some others are from future reserved words.

        char16_t first = data.charAt(0);

        switch (data.length) {
        case 2:
            if (first == 'i') {
                if (data.equalsSameLength("if")) {
                    return If;
                } else if (data.equalsSameLength("in")) {
                    return In;
                }

            } else if (first == 'd' && data.equalsSameLength("do")) {
                return Do;
            }
            break;
        case 3:
            if (first == 'v' && data.equalsSameLength("var")) {
                return Var;
            } else if (first == 'f' && data.equalsSameLength("for")) {
                return For;
            } else if (first == 'n' && data.equalsSameLength("new")) {
                return New;
            } else if (first == 't' && data.equalsSameLength("try")) {
                return Try;
            } else if (first == 'l' && data.equalsSameLength("let")) {
                return Let;
            }

            break;
        case 4:
            if (first == 't' && data.equalsSameLength("this")) {
                return This;
            } else if (first == 'e' && data.equalsSameLength("else")) {
                return Else;
            } else if (first == 'c' && data.equalsSameLength("case")) {
                return Case;
            } else if (first == 'v' && data.equalsSameLength("void")) {
                return Void;
            } else if (first == 'w' && data.equalsSameLength("with")) {
                return With;
            } else if (first == 'e' && data.equalsSameLength("enum")) {
                return Enum;
            }
            break;
        case 5:
            if (first == 'w' && data.equalsSameLength("while")) {
                return While;
            } else if (first == 'b' && data.equalsSameLength("break")) {
                return Break;
            } else if (first == 'c') {
                if (data.equalsSameLength("catch")) {
                    return Catch;
                } else if (data.equalsSameLength("const")) {
                    return Const;
                } else if (data.equalsSameLength("class")) {
                    return Class;
                }
            } else if (first == 't' && data.equalsSameLength("throw")) {
                return Throw;
            } else if (first == 'y' && data.equalsSameLength("yield")) {
                return Yield;
            } else if (first == 's' && data.equalsSameLength("super")) {
                return Super;
                /*
            } else if (first == 'a' && data.equalsSameLength("await")) {
                return Await;
                */
            }
            break;
        case 6:
            if (first == 'r' && data.equalsSameLength("return")) {
                return Return;
            } else if (first == 't' && data.equalsSameLength("typeof")) {
                return Typeof;
            } else if (first == 'd' && data.equalsSameLength("delete")) {
                return Delete;
            } else if (first == 's' && data.equalsSameLength("switch")) {
                return Switch;
            } else if (first == 'e' && data.equalsSameLength("export")) {
                return Export;
            } else if (first == 'i' && data.equalsSameLength("import")) {
                return Import;
            }
            break;
        case 7:
            if (first == 'd' && data.equalsSameLength("default")) {
                return Default;
            } else if (first == 'f' && data.equalsSameLength("finally")) {
                return Finally;
            } else if (first == 'e' && data.equalsSameLength("extends")) {
                return Extends;
            }
            break;
        case 8:
            if (first == 'f' && data.equalsSameLength("function")) {
                return Function;
            } else if (first == 'c' && data.equalsSameLength("continue")) {
                return Continue;
            } else if (first == 'd' && data.equalsSameLength("debugger")) {
                return Debugger;
            }
            break;
        case 10:
            if (first == 'i' && data.equalsSameLength("instanceof")) {
                return InstanceofKeyword;
            }
            break;
        }

        return NotKeyword;
    }

    char32_t codePointAt(size_t i)
    {
        char32_t cp, first, second;
        cp = this->source.bufferedCharAt(i);
        if (cp >= 0xD800 && cp <= 0xDBFF) {
            second = this->source.bufferedCharAt(i + 1);
            if (second >= 0xDC00 && second <= 0xDFFF) {
                first = cp;
                cp = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
            }
        }

        return cp;
    }

    int hexValue(char16_t ch)
    {
        int c = 0;
        if (ch >= '0' && ch <= '9') {
            c = ch - '0';
        } else if (ch >= 'a' && ch <= 'f') {
            c = ch - 'a' + 10;
        } else if (ch >= 'A' && ch <= 'F') {
            c = ch - 'A' + 10;
        } else {
            RELEASE_ASSERT_NOT_REACHED();
        }
        return c;
    }

    struct CharOrEmptyResult {
        char32_t code;
        bool isEmpty;

        CharOrEmptyResult(char32_t code, bool isEmpty)
        {
            this->code = code;
            this->isEmpty = isEmpty;
        }
    };

    CharOrEmptyResult scanHexEscape(char prefix)
    {
        size_t len = (prefix == 'u') ? 4 : 2;
        char32_t code = 0;

        for (size_t i = 0; i < len; ++i) {
            if (!this->eof() && isHexDigit(this->source.bufferedCharAt(this->index))) {
                code = code * 16 + hexValue(this->source.bufferedCharAt(this->index++));
            } else {
                return CharOrEmptyResult(0, true);
            }
        }

        return CharOrEmptyResult(code, false);
    }

    char32_t scanUnicodeCodePointEscape()
    {
        char16_t ch = this->source.bufferedCharAt(this->index);
        char32_t code = 0;

        // At least, one hex digit is required.
        if (ch == '}') {
            this->throwUnexpectedToken();
        }

        while (!this->eof()) {
            ch = this->source.bufferedCharAt(this->index++);
            if (!isHexDigit(ch)) {
                break;
            }
            code = code * 16 + hexValue(ch);
        }

        if (code > 0x10FFFF || ch != '}') {
            this->throwUnexpectedToken();
        }

        return code;
    };

    StringView getIdentifier()
    {
        const size_t start = this->index++;
        while (!this->eof()) {
            const char16_t ch = this->source.bufferedCharAt(this->index);
            if (ch == 0x5C) {
                // Blackslash (U+005C) marks Unicode escape sequence.
                this->index = start;
                return this->getComplexIdentifier();
            } else if (ch >= 0xD800 && ch < 0xDFFF) {
                // Need to handle surrogate pairs.
                this->index = start;
                return this->getComplexIdentifier();
            }
            if (isIdentifierPart(ch)) {
                ++this->index;
            } else {
                break;
            }
        }

        return StringView(this->source.src(), start, this->index);
    }

    StringView getComplexIdentifier()
    {
        char32_t cp = this->codePointAt(this->index);
        ParserCharPiece piece = ParserCharPiece(cp);
        UTF16StringDataNonGCStd id(piece.data, piece.length);
        this->index += id.length();

        // '\u' (U+005C, U+0075) denotes an escaped character.
        char32_t ch;
        if (cp == 0x5C) {
            if (this->source.bufferedCharAt(this->index) != 0x75) {
                this->throwUnexpectedToken();
            }
            ++this->index;
            if (this->source.bufferedCharAt(this->index) == '{') {
                ++this->index;
                ch = this->scanUnicodeCodePointEscape();
            } else {
                CharOrEmptyResult res = this->scanHexEscape('u');
                ch = res.code;
                cp = ch;
                if (res.isEmpty || ch == '\\' || !isIdentifierStart(cp)) {
                    this->throwUnexpectedToken();
                }
            }
            id = ch;
        }

        while (!this->eof()) {
            cp = this->codePointAt(this->index);
            if (!isIdentifierPart(cp)) {
                break;
            }
            // ch = Character.fromCodePoint(cp);
            ch = cp;
            piece = ParserCharPiece(ch);
            id += UTF16StringDataNonGCStd(piece.data, piece.length);
            this->index += piece.length;

            // '\u' (U+005C, U+0075) denotes an escaped character.
            if (cp == 0x5C) {
                // id = id.substr(0, id.length - 1);
                id.erase(id.length() - 1);

                if (this->source.bufferedCharAt(this->index) != 0x75) {
                    this->throwUnexpectedToken();
                }
                ++this->index;
                if (this->source.bufferedCharAt(this->index) == '{') {
                    ++this->index;
                    ch = this->scanUnicodeCodePointEscape();
                } else {
                    CharOrEmptyResult res = this->scanHexEscape('u');
                    ch = res.code;
                    cp = ch;
                    if (res.isEmpty || ch == '\\' || !isIdentifierPart(cp)) {
                        this->throwUnexpectedToken();
                    }
                }
                piece = ParserCharPiece(ch);
                id += UTF16StringDataNonGCStd(piece.data, piece.length);
            }
        }

        String* str = new UTF16String(id.data(), id.length());
        return StringView(str, 0, str->length());
    }

    struct OctalToDecimalResult {
        char16_t code;
        bool octal;

        OctalToDecimalResult(char16_t code, bool octal)
        {
            this->code = code;
            this->octal = octal;
        }
    };
    OctalToDecimalResult octalToDecimal(char16_t ch)
    {
        // \0 is not octal escape sequence
        bool octal = (ch != '0');
        char16_t code = octalValue(ch);

        if (!this->eof() && isOctalDigit(this->source.bufferedCharAt(this->index))) {
            octal = true;
            code = code * 8 + octalValue(this->source.bufferedCharAt(this->index++));

            // 3 digits are only allowed when string starts
            // with 0, 1, 2, 3
            // if ('0123'.indexOf(ch) >= 0 && !this->eof() && Character.isOctalDigit(this->source.charCodeAt(this->index))) {
            if ((ch >= '0' && ch <= '3') && !this->eof() && isOctalDigit(this->source.bufferedCharAt(this->index))) {
                code = code * 8 + octalValue(this->source.bufferedCharAt(this->index++));
            }
        }

        return OctalToDecimalResult(code, octal);
    };

    // ECMA-262 11.6 Names and Keywords

    RefPtr<ScannerResult> scanIdentifier()
    {
        Token type;
        const size_t start = this->index;

        // Backslash (U+005C) starts an escaped character.
        StringView id;
        if (this->source.bufferedCharAt(start) == 0x5C)
            id = this->getComplexIdentifier();
        else
            id = this->getIdentifier();

        // There is no keyword or literal with only one character.
        // Thus, it must be an identifier.
        KeywordKind keywordKind = NotKeyword;
        auto data = id.bufferAccessData();
        if (data.length == 1) {
            type = Token::IdentifierToken;
        } else if ((keywordKind = this->isKeyword(data))) {
            type = Token::KeywordToken;
        } else if (data.length == 4) {
            if (data.equalsSameLength("null")) {
                type = Token::NullLiteralToken;
            } else if (data.equalsSameLength("true")) {
                type = Token::BooleanLiteralToken;
            } else {
                type = Token::IdentifierToken;
            }
        } else if ((data.length == 5 && data.equalsSameLength("false"))) {
            type = Token::BooleanLiteralToken;
        } else {
            type = Token::IdentifierToken;
        }

        if (keywordKind) {
            RefPtr<ScannerResult> r = adoptRef(new (createScannerResult()) ScannerResult(this, type, id, this->lineNumber, this->lineStart, start, this->index));
            r->valueKeywordKind = keywordKind;
            return r;
        } else {
            return adoptRef(new (createScannerResult()) ScannerResult(this, type, id, this->lineNumber, this->lineStart, start, this->index));
        }
    }

    // ECMA-262 11.7 Punctuators
    RefPtr<ScannerResult> scanPunctuator()
    {
        RefPtr<ScannerResult> token = adoptRef(new (createScannerResult()) ScannerResult(this, Token::PunctuatorToken, StringView(), this->lineNumber, this->lineStart, this->index, this->index));

        PunctuatorsKind kind;
        // Check for most common single-character punctuators.
        size_t start = this->index;
        char16_t ch0 = this->source.bufferedCharAt(this->index);
        char ch1, ch2, ch3;
        switch (ch0) {
        case '(':
            ++this->index;
            kind = LeftParenthesis;
            break;

        case '{':
            this->curlyStack.push_back(Curly("{\0\0"));
            ++this->index;
            kind = LeftBrace;
            break;

        case '.':
            ++this->index;
            kind = Period;
            if (this->source.bufferedCharAt(this->index) == '.' && this->source.bufferedCharAt(this->index + 1) == '.') {
                // Spread operator: ...
                this->index += 2;
                // resultStr = "...";
                kind = PeriodPeriodPeriod;
            }
            break;

        case '}':
            ++this->index;
            if (!this->curlyStack.size()) {
                this->throwUnexpectedToken();
            }
            this->curlyStack.pop_back();
            kind = RightBrace;
            break;
        case ')':
            kind = RightParenthesis;
            ++this->index;
            break;
        case ';':
            kind = SemiColon;
            ++this->index;
            break;
        case ',':
            kind = Comma;
            ++this->index;
            break;
        case '[':
            kind = LeftSquareBracket;
            ++this->index;
            break;
        case ']':
            kind = RightSquareBracket;
            ++this->index;
            break;
        case ':':
            kind = Colon;
            ++this->index;
            break;
        case '?':
            kind = GuessMark;
            ++this->index;
            break;
        case '~':
            kind = Wave;
            ++this->index;
            break;

        case '>':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '>') {
                ch2 = this->source.bufferedCharAt(this->index + 2);
                if (ch2 == '>') {
                    ch3 = this->source.bufferedCharAt(this->index + 3);
                    if (ch3 == '=') {
                        this->index += 4;
                        kind = UnsignedRightShiftEqual;
                    } else {
                        kind = UnsignedRightShift;
                        this->index += 3;
                    }
                } else if (ch2 == '=') {
                    kind = RightShiftEqual;
                    this->index += 3;
                } else {
                    kind = RightShift;
                    this->index += 2;
                }
            } else if (ch1 == '=') {
                kind = RightInequalityEqual;
                this->index += 2;
            } else {
                kind = RightInequality;
                this->index += 1;
            }
            break;
        case '<':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '<') {
                ch2 = this->source.bufferedCharAt(this->index + 2);
                if (ch2 == '=') {
                    kind = LeftShiftEqual;
                    this->index += 3;
                } else {
                    kind = LeftShift;
                    this->index += 2;
                }
            } else if (ch1 == '=') {
                kind = LeftInequalityEqual;
                this->index += 2;
            } else {
                kind = LeftInequality;
                this->index += 1;
            }
            break;
        case '=':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '=') {
                ch2 = this->source.bufferedCharAt(this->index + 2);
                if (ch2 == '=') {
                    kind = StrictEqual;
                    this->index += 3;
                } else {
                    kind = Equal;
                    this->index += 2;
                }
            } else if (ch1 == '>') {
                kind = Arrow;
                this->index += 2;
            } else {
                kind = Substitution;
                this->index += 1;
            }
            break;
        case '!':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '=') {
                ch2 = this->source.bufferedCharAt(this->index + 2);
                if (ch2 == '=') {
                    kind = NotStrictEqual;
                    this->index += 3;
                } else {
                    kind = NotEqual;
                    this->index += 2;
                }
            } else {
                kind = ExclamationMark;
                this->index += 1;
            }
            break;
        case '&':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '&') {
                kind = LogicalAnd;
                this->index += 2;
            } else if (ch1 == '=') {
                kind = BitwiseAndEqual;
                this->index += 2;
            } else {
                kind = BitwiseAnd;
                this->index += 1;
            }
            break;
        case '|':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '|') {
                kind = LogicalOr;
                this->index += 2;
            } else if (ch1 == '=') {
                kind = BitwiseOrEqual;
                this->index += 2;
            } else {
                kind = BitwiseOr;
                this->index += 1;
            }
            break;
        case '^':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '=') {
                kind = BitwiseXorEqual;
                this->index += 2;
            } else {
                kind = BitwiseXor;
                this->index += 1;
            }
            break;
        case '+':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '+') {
                kind = PlusPlus;
                this->index += 2;
            } else if (ch1 == '=') {
                kind = PlusEqual;
                this->index += 2;
            } else {
                kind = Plus;
                this->index += 1;
            }
            break;
        case '-':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '-') {
                kind = MinusMinus;
                this->index += 2;
            } else if (ch1 == '=') {
                kind = MinusEqual;
                this->index += 2;
            } else {
                kind = Minus;
                this->index += 1;
            }
            break;
        case '*':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '=') {
                kind = MultiplyEqual;
                this->index += 2;
            } else {
                kind = Multiply;
                this->index += 1;
            }
            break;
        case '/':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '=') {
                kind = DivideEqual;
                this->index += 2;
            } else {
                kind = Divide;
                this->index += 1;
            }
            break;
        case '%':
            ch1 = this->source.bufferedCharAt(this->index + 1);
            if (ch1 == '=') {
                kind = ModEqual;
                this->index += 2;
            } else {
                kind = Mod;
                this->index += 1;
            }
            break;
        default:
            break;
        }

        if (this->index == token->start) {
            this->throwUnexpectedToken();
        }

        token->end = this->index;
        token->valuePunctuatorsKind = kind;
        token->valueString = StringView(this->source.src(), start, this->index);
        return RefPtr<ScannerResult>(token);
    }

    // ECMA-262 11.8.3 Numeric Literals

    RefPtr<ScannerResult> scanHexLiteral(size_t start)
    {
        uint64_t number = 0;
        double numberDouble = 0.0;
        bool shouldUseDouble = false;
        bool scanned = false;

        size_t shiftCount = 0;
        while (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index);
            if (!isHexDigit(ch)) {
                break;
            }
            if (shouldUseDouble) {
                numberDouble = numberDouble * 16 + toHexNumericValue(ch);
            } else {
                number = (number << 4) + toHexNumericValue(ch);
                if (++shiftCount >= 16) {
                    shouldUseDouble = true;
                    numberDouble = number;
                    number = 0;
                }
            }
            this->index++;
            scanned = true;
        }

        if (!scanned) {
            this->throwUnexpectedToken();
        }

        if (isIdentifierStart(this->source.bufferedCharAt(this->index))) {
            this->throwUnexpectedToken();
        }

        if (shouldUseDouble) {
            ASSERT(number == 0);
            return adoptRef(new (createScannerResult()) ScannerResult(this, Token::NumericLiteralToken, numberDouble, this->lineNumber, this->lineStart, start, this->index));
        } else {
            ASSERT(numberDouble == 0.0);
            return adoptRef(new (createScannerResult()) ScannerResult(this, Token::NumericLiteralToken, number, this->lineNumber, this->lineStart, start, this->index));
        }
    }

    RefPtr<ScannerResult> scanBinaryLiteral(size_t start)
    {
        uint64_t number = 0;
        bool scanned = false;

        while (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index);
            if (ch != '0' && ch != '1') {
                break;
            }
            number = (number << 1) + ch - '0';
            this->index++;
            scanned = true;
        }

        if (!scanned) {
            // only 0b or 0B
            this->throwUnexpectedToken();
        }

        if (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index);
            /* istanbul ignore else */
            if (isIdentifierStart(ch) || isDecimalDigit(ch)) {
                this->throwUnexpectedToken();
            }
        }

        return adoptRef(new (createScannerResult()) ScannerResult(this, Token::NumericLiteralToken, number, this->lineNumber, this->lineStart, start, this->index));
    }

    RefPtr<ScannerResult> scanOctalLiteral(char16_t prefix, size_t start)
    {
        uint64_t number = 0;
        bool scanned = false;
        bool octal = isOctalDigit(prefix);

        while (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index);
            if (!isOctalDigit(ch)) {
                break;
            }
            number = (number << 3) + ch - '0';
            this->index++;
            scanned = true;
        }

        if (!octal && !scanned) {
            // only 0o or 0O
            throwUnexpectedToken();
        }

        if (isIdentifierStart(this->source.bufferedCharAt(this->index)) || isDecimalDigit(this->source.bufferedCharAt(this->index))) {
            throwUnexpectedToken();
        }
        RefPtr<ScannerResult> ret = adoptRef(new (createScannerResult()) ScannerResult(this, Token::NumericLiteralToken, number, this->lineNumber, this->lineStart, start, this->index));
        ret->octal = octal;

        return ret;
    }

    bool isImplicitOctalLiteral()
    {
        // Implicit octal, unless there is a non-octal digit.
        // (Annex B.1.1 on Numeric Literals)
        for (size_t i = this->index + 1; i < this->length; ++i) {
            const char16_t ch = this->source.bufferedCharAt(i);
            if (ch == '8' || ch == '9') {
                return false;
            }
            if (!isOctalDigit(ch)) {
                return true;
            }
        }
        return true;
    }

    RefPtr<ScannerResult> scanNumericLiteral()
    {
        const size_t start = this->index;
        char16_t ch = this->source.bufferedCharAt(start);
        char16_t startChar = ch;
        ASSERT(isDecimalDigit(ch) || (ch == '.'));
        // 'Numeric literal must start with a decimal digit or a decimal point');

        std::string number;
        number.reserve(32);

        if (ch != '.') {
            number = this->source.bufferedCharAt(this->index++);
            ch = this->source.bufferedCharAt(this->index);

            // Hex number starts with '0x'.
            // Octal number starts with '0'.
            // Octal number in ES6 starts with '0o'.
            // Binary number in ES6 starts with '0b'.
            if (number == "0") {
                if (ch == 'x' || ch == 'X') {
                    ++this->index;
                    return this->scanHexLiteral(start);
                }
                if (ch == 'b' || ch == 'B') {
                    ++this->index;
                    return this->scanBinaryLiteral(start);
                }
                if (ch == 'o' || ch == 'O') {
                    return this->scanOctalLiteral(ch, start);
                }

                if (ch && isOctalDigit(ch)) {
                    if (this->isImplicitOctalLiteral()) {
                        return this->scanOctalLiteral(ch, start);
                    }
                }
            }

            while (isDecimalDigit(this->source.bufferedCharAt(this->index))) {
                number += this->source.bufferedCharAt(this->index++);
            }
            ch = this->source.bufferedCharAt(this->index);
        }

        if (ch == '.') {
            number += this->source.bufferedCharAt(this->index++);
            while (isDecimalDigit(this->source.bufferedCharAt(this->index))) {
                number += this->source.bufferedCharAt(this->index++);
            }
            ch = this->source.bufferedCharAt(this->index);
        }

        if (ch == 'e' || ch == 'E') {
            number += this->source.bufferedCharAt(this->index++);

            ch = this->source.bufferedCharAt(this->index);
            if (ch == '+' || ch == '-') {
                number += this->source.bufferedCharAt(this->index++);
            }
            if (isDecimalDigit(this->source.bufferedCharAt(this->index))) {
                while (isDecimalDigit(this->source.bufferedCharAt(this->index))) {
                    number += this->source.bufferedCharAt(this->index++);
                }
            } else {
                this->throwUnexpectedToken();
            }
        }

        if (isIdentifierStart(this->source.bufferedCharAt(this->index))) {
            this->throwUnexpectedToken();
        }

        int length = number.length();
        int length_dummy;
        double_conversion::StringToDoubleConverter converter(double_conversion::StringToDoubleConverter::ALLOW_HEX
                                                                 | double_conversion::StringToDoubleConverter::ALLOW_LEADING_SPACES
                                                                 | double_conversion::StringToDoubleConverter::ALLOW_TRAILING_SPACES,
                                                             0.0, double_conversion::Double::NaN(),
                                                             "Infinity", "NaN");
        double ll = converter.StringToDouble(number.data(), length, &length_dummy);

        auto ret = adoptRef(new (createScannerResult()) ScannerResult(this, Token::NumericLiteralToken, ll, this->lineNumber, this->lineStart, start, this->index));
        if (startChar == '0' && length >= 2 && ll >= 1) {
            ret->startWithZero = true;
        }
        return ret;
    }

    // ECMA-262 11.8.4 String Literals

    RefPtr<ScannerResult> scanStringLiteral()
    {
        // TODO apply rope-string
        const size_t start = this->index;
        char16_t quote = this->source.bufferedCharAt(start);
        ASSERT((quote == '\'' || quote == '"'));
        // 'String literal must starts with a quote');

        ++this->index;
        bool octal = false;
        bool stringViewAllLatin1 = true;
        bool isPlainCase = true;

        UTF16StringDataNonGCStd stringUTF16;
        StringView str;

#define CONVERT_UNPLAIN_CASE_IF_NEEDED()                                   \
    if (isPlainCase) {                                                     \
        auto temp = str.toUTF16StringData();                               \
        stringUTF16 = UTF16StringDataNonGCStd(temp.data(), temp.length()); \
        isPlainCase = false;                                               \
    }

        while (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index++);

            if (ch == quote) {
                quote = '\0';
                break;
            } else if (ch == '\\') {
                ch = this->source.bufferedCharAt(this->index++);
                CONVERT_UNPLAIN_CASE_IF_NEEDED()
                if (!ch || !isLineTerminator(ch)) {
                    switch (ch) {
                    case 'u':
                    case 'x':
                        if (this->source.bufferedCharAt(this->index) == '{') {
                            ++this->index;
                            ParserCharPiece piece(this->scanUnicodeCodePointEscape());
                            stringUTF16 += UTF16StringDataNonGCStd(piece.data, piece.length);
                        } else {
                            CharOrEmptyResult res = this->scanHexEscape(ch);
                            if (res.isEmpty) {
                                this->throwUnexpectedToken();
                            }
                            const char32_t unescaped = res.code;
                            ParserCharPiece piece(unescaped);
                            stringUTF16 += UTF16StringDataNonGCStd(piece.data, piece.length);
                        }
                        break;
                    case 'n':
                        stringUTF16 += '\n';
                        break;
                    case 'r':
                        stringUTF16 += '\r';
                        break;
                    case 't':
                        stringUTF16 += '\t';
                        break;
                    case 'b':
                        stringUTF16 += '\b';
                        break;
                    case 'f':
                        stringUTF16 += '\f';
                        break;
                    case 'v':
                        stringUTF16 += '\x0B';
                        break;

                    default:
                        if (ch && isOctalDigit(ch)) {
                            OctalToDecimalResult octToDec = this->octalToDecimal(ch);

                            octal = octToDec.octal || octal;
                            stringUTF16 += octToDec.code;
                        } else if (isDecimalDigit(ch)) {
                            octal = true;
                            stringUTF16 += ch;
                        } else {
                            stringUTF16 += ch;
                        }
                        break;
                    }
                } else {
                    ++this->lineNumber;
                    if (ch == '\r' && this->source.bufferedCharAt(this->index) == '\n') {
                        ++this->index;
                    } else if (ch == '\n' && this->source.bufferedCharAt(this->index) == '\r') {
                        ++this->index;
                    }
                    this->lineStart = this->index;
                }
            } else if (isLineTerminator(ch)) {
                break;
            } else {
                if (isPlainCase) {
                    if (ch >= 256) {
                        stringViewAllLatin1 = false;
                    }
                    str = StringView(this->source.src(), start + 1, start + 1 + str.length() + 1);
                } else {
                    stringUTF16 += ch;
                }
            }
        }

        if (quote != '\0') {
            this->index = start;
            this->throwUnexpectedToken();
        }

        RefPtr<ScannerResult> ret;
        if (isPlainCase) {
            if (!str.string()->has8BitContent() && stringViewAllLatin1) {
                str = StringView(new Latin1String((char16_t*)str.bufferAccessData().buffer, str.length()), 0, str.length());
            }
            ret = adoptRef(new (createScannerResult()) ScannerResult(this, Token::StringLiteralToken, str, /*octal, */ this->lineNumber, this->lineStart, start, this->index));
        } else {
            String* newStr;
            if (isAllLatin1(stringUTF16.data(), stringUTF16.length())) {
                newStr = new Latin1String(stringUTF16.data(), stringUTF16.length());
            } else {
                newStr = new UTF16String(stringUTF16.data(), stringUTF16.length());
            }
            ret = adoptRef(new (createScannerResult()) ScannerResult(this, Token::StringLiteralToken, StringView(newStr, 0, newStr->length()), /*octal, */ this->lineNumber, this->lineStart, start, this->index));
        }
        ret->octal = octal;
        ret->plain = isPlainCase;

        return ret;
    }

    // ECMA-262 11.8.6 Template Literal Lexical Components

    RefPtr<ScannerResult> scanTemplate()
    {
        // TODO apply rope-string
        UTF16StringDataNonGCStd cooked;
        bool terminated = false;
        size_t start = this->index;

        bool head = (this->source.bufferedCharAt(start) == '`');
        bool tail = false;
        size_t rawOffset = 2;

        ++this->index;

        while (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index++);
            if (ch == '`') {
                rawOffset = 1;
                tail = true;
                terminated = true;
                break;
            } else if (ch == '$') {
                if (this->source.bufferedCharAt(this->index) == '{') {
                    this->curlyStack.push_back(Curly("${\0"));
                    ++this->index;
                    terminated = true;
                    break;
                }
                cooked += ch;
            } else if (ch == '\\') {
                ch = this->source.bufferedCharAt(this->index++);
                if (!isLineTerminator(ch)) {
                    switch (ch) {
                    case 'n':
                        cooked += '\n';
                        break;
                    case 'r':
                        cooked += '\r';
                        break;
                    case 't':
                        cooked += '\t';
                        break;
                    case 'u':
                    case 'x':
                        if (this->source.bufferedCharAt(this->index) == '{') {
                            ++this->index;
                            cooked += this->scanUnicodeCodePointEscape();
                        } else {
                            const size_t restore = this->index;
                            CharOrEmptyResult res = this->scanHexEscape(ch);
                            const char32_t unescaped = res.code;
                            if (!res.isEmpty) {
                                ParserCharPiece piece(unescaped);
                                cooked += UTF16StringDataNonGCStd(piece.data, piece.length);
                            } else {
                                this->index = restore;
                                cooked += ch;
                            }
                        }
                        break;
                    case 'b':
                        cooked += '\b';
                        break;
                    case 'f':
                        cooked += '\f';
                        break;
                    case 'v':
                        cooked += '\v';
                        break;

                    default:
                        if (ch == '0') {
                            if (isDecimalDigit(this->source.bufferedCharAt(this->index))) {
                                // Illegal: \01 \02 and so on
                                this->throwUnexpectedToken(Messages::TemplateOctalLiteral);
                            }
                            cooked += (char16_t)'\0';
                        } else if (isOctalDigit(ch)) {
                            // Illegal: \1 \2
                            this->throwUnexpectedToken(Messages::TemplateOctalLiteral);
                        } else {
                            cooked += ch;
                        }
                        break;
                    }
                } else {
                    ++this->lineNumber;
                    if (ch == '\r' && this->source.bufferedCharAt(this->index) == '\n') {
                        ++this->index;
                    }
                    this->lineStart = this->index;
                }
            } else if (isLineTerminator(ch)) {
                ++this->lineNumber;
                if (ch == '\r' && this->source.bufferedCharAt(this->index) == '\n') {
                    ++this->index;
                }
                this->lineStart = this->index;
                cooked += '\n';
            } else {
                cooked += ch;
            }
        }

        if (!terminated) {
            this->throwUnexpectedToken();
        }

        if (!head) {
            this->curlyStack.pop_back();
        }

        ScanTemplteResult result;
        result.head = head;
        result.tail = tail;
        // TODO when parsing global code, we should generate new string not string view of code
        result.raw = StringView(this->source.src(), start + 1, this->index - rawOffset);
        result.valueCooked = UTF16StringData(cooked.data(), cooked.length());

        return adoptRef(new (createScannerResult()) ScannerResult(this, Token::TemplateToken, result, this->lineNumber, this->lineStart, start, this->index));
    }

    // ECMA-262 11.8.5 Regular Expression Literals
    /*
    testRegExp(pattern: string, flags: string) {
        // The BMP character to use as a replacement for astral symbols when
        // translating an ES6 "u"-flagged pattern to an ES5-compatible
        // approximation.
        // Note: replacing with '\uFFFF' enables false positives in unlikely
        // scenarios. For example, `[\u{1044f}-\u{10440}]` is an invalid
        // pattern that would not be detected by this substitution.
        const astralSubstitute = '\uFFFF';
        let tmp = pattern;
        let self = this;

        if (flags.indexOf('u') >= 0) {
            tmp = tmp
                // Replace every Unicode escape sequence with the equivalent
                // BMP character or a constant ASCII code point in the case of
                // astral symbols. (See the above note on `astralSubstitute`
                // for more information.)
                .replace(/\\u\{([0-9a-fA-F]+)\}|\\u([a-fA-F0-9]{4})/g, function($0, $1, $2) {
                    const codePoint = parseInt($1 || $2, 16);
                    if (codePoint > 0x10FFFF) {
                        self.throwUnexpectedToken(Messages.InvalidRegExp);
                    }
                    if (codePoint <= 0xFFFF) {
                        return String.fromCharCode(codePoint);
                    }
                    return astralSubstitute;
                })
                // Replace each paired surrogate with a single ASCII symbol to
                // avoid throwing on regular expressions that are only valid in
                // combination with the "u" flag.
                .replace(
                /[\uD800-\uDBFF][\uDC00-\uDFFF]/g,
                astralSubstitute
                );
        }

        // First, detect invalid regular expressions.
        try {
            RegExp(tmp);
        } catch (e) {
            this->throwUnexpectedToken(Messages.InvalidRegExp);
        }

        // Return a regular expression object for this pattern-flag pair, or
        // `null` in case the current environment doesn't support the flags it
        // uses.
        try {
            return new RegExp(pattern, flags);
        } catch (exception) {
            return null;
        }
    };
    */

    String* scanRegExpBody()
    {
        char16_t ch = this->source.bufferedCharAt(this->index);
        ASSERT(ch == '/');
        // assert(ch == '/', 'Regular expression literal must start with a slash');

        // TODO apply rope-string
        char16_t ch0 = this->source.bufferedCharAt(this->index++);
        UTF16StringDataNonGCStd str(&ch0, 1);
        bool classMarker = false;
        bool terminated = false;

        while (!this->eof()) {
            ch = this->source.bufferedCharAt(this->index++);
            str += ch;
            if (ch == '\\') {
                ch = this->source.bufferedCharAt(this->index++);
                // ECMA-262 7.8.5
                if (isLineTerminator(ch)) {
                    this->throwUnexpectedToken(Messages::UnterminatedRegExp);
                }
                str += ch;
            } else if (isLineTerminator(ch)) {
                this->throwUnexpectedToken(Messages::UnterminatedRegExp);
            } else if (classMarker) {
                if (ch == ']') {
                    classMarker = false;
                }
            } else {
                if (ch == '/') {
                    terminated = true;
                    break;
                } else if (ch == '[') {
                    classMarker = true;
                }
            }
        }

        if (!terminated) {
            this->throwUnexpectedToken(Messages::UnterminatedRegExp);
        }

        // Exclude leading and trailing slash.
        str = str.substr(1, str.length() - 2);
        /*
        return {
            value: body,
            literal: str
        };*/
        if (isAllASCII(str.data(), str.length())) {
            return new ASCIIString(str.data(), str.length());
        } else {
            return new UTF16String(str.data(), str.length());
        }
    }

    String* scanRegExpFlags()
    {
        // UTF16StringData str = '';
        UTF16StringDataNonGCStd flags;
        while (!this->eof()) {
            char16_t ch = this->source.bufferedCharAt(this->index);
            if (!isIdentifierPart(ch)) {
                break;
            }

            ++this->index;
            if (ch == '\\' && !this->eof()) {
                ch = this->source.bufferedCharAt(this->index);
                if (ch == 'u') {
                    ++this->index;
                    const size_t restore = this->index;
                    char32_t ch32;
                    CharOrEmptyResult res = this->scanHexEscape('u');
                    ch32 = res.code;
                    if (!res.isEmpty) {
                        ParserCharPiece piece(ch32);
                        flags += UTF16StringDataNonGCStd(piece.data, piece.length);
                        /*
                        for (str += '\\u'; restore < this->index; ++restore) {
                            str += this->source[restore];
                        }*/
                    } else {
                        this->index = restore;
                        flags += 'u';
                        // str += '\\u';
                    }
                    this->tolerateUnexpectedToken();
                } else {
                    // str += '\\';
                    this->tolerateUnexpectedToken();
                }
            } else {
                flags += ch;
                // str += ch;
            }
        }

        /*
        return {
            value: flags,
            literal: str
        };
        */
        if (isAllASCII(flags.data(), flags.length())) {
            return new ASCIIString(flags.data(), flags.length());
        } else {
            return new UTF16String(flags.data(), flags.length());
        }
    }

    RefPtr<ScannerResult> scanRegExp()
    {
        const size_t start = this->index;

        String* body = this->scanRegExpBody();
        String* flags = this->scanRegExpFlags();
        // const value = this->testRegExp(body.value, flags.value);

        ScanRegExpResult result;
        result.body = body;
        result.flags = flags;
        RefPtr<ScannerResult> res = adoptRef(new (createScannerResult()) ScannerResult(this, Token::RegularExpressionToken, StringView(), this->lineNumber, this->lineStart, start, this->index));
        res->valueRegexp = result;
        return res;
    };

    RefPtr<ScannerResult> lex()
    {
        if (this->eof()) {
            return adoptRef(new (createScannerResult()) ScannerResult(this, Token::EOFToken, this->lineNumber, this->lineStart, this->index, this->index));
        }

        const char16_t cp = this->source.bufferedCharAt(this->index);

        if (isIdentifierStart(cp)) {
            return this->scanIdentifier();
        }

        // Very common: ( and ) and ;
        if (cp == 0x28 || cp == 0x29 || cp == 0x3B) {
            return this->scanPunctuator();
        }

        // String literal starts with single quote (U+0027) or double quote (U+0022).
        if (cp == 0x27 || cp == 0x22) {
            return this->scanStringLiteral();
        }

        // Dot (.) U+002E can also start a floating-point number, hence the need
        // to check the next character.
        if (cp == 0x2E) {
            if (isDecimalDigit(this->source.bufferedCharAt(this->index + 1))) {
                return this->scanNumericLiteral();
            }
            return this->scanPunctuator();
        }

        if (isDecimalDigit(cp)) {
            return this->scanNumericLiteral();
        }

        // Template literals start with ` (U+0060) for template head
        // or } (U+007D) for template middle or template tail.
        if (cp == 0x60 || (cp == 0x7D && (this->curlyStack.size() && strcmp(this->curlyStack.back().m_curly, "${") == 0))) {
            return this->scanTemplate();
        }

        // Possible identifier start in a surrogate pair.
        if (cp >= 0xD800 && cp < 0xDFFF) {
            if (isIdentifierStart(this->codePointAt(this->index))) {
                return this->scanIdentifier();
            }
        }
        return this->scanPunctuator();
    }
};

ScannerResult::~ScannerResult()
{
    if (this->scanner->isPoolEnabled) {
        this->scanner->resultMemoryPool.push_back(this);
    }
}

struct Config : public gc {
    bool range : 1;
    bool loc : 1;
    bool tokens : 1;
    bool comment : 1;
    bool tolerant : 1;
    bool parseSingleFunction : 1;
    CodeBlock* parseSingleFunctionTarget;
    SmallValue parseSingleFunctionChildIndex; // use SmallValue for saving index. this reduce memory leak from stack
};


struct Context : public gc {
    bool allowIn : 1;
    bool allowYield : 1;
    bool isAssignmentTarget : 1;
    bool isBindingElement : 1;
    bool inFunctionBody : 1;
    bool inIteration : 1;
    bool inSwitch : 1;
    bool inCatch : 1;
    bool inDirectCatchScope : 1;
    bool inWith : 1;
    bool inLoop : 1;
    bool strict : 1;
    RefPtr<ScannerResult> firstCoverInitializedNameError;
    std::vector<std::pair<String*, bool>> labelSet;
    std::vector<FunctionDeclarationNode*, GCUtil::gc_malloc_ignore_off_page_allocator<FunctionDeclarationNode*>> functionDeclarationsInDirectCatchScope;
};

struct Marker : public gc {
    size_t index;
    size_t lineNumber;
    size_t lineStart;
};

struct MetaNode : public gc {
    size_t index;
    size_t line;
    size_t column;
};


struct ArrowParameterPlaceHolderNode : public gc {
    String* type;
    ExpressionNodeVector params;
};

struct DeclarationOptions : public gc {
    bool inFor;
};

class Parser : public gc {
public:
    ::Escargot::Context* escargotContext;
    Config config;
    ParserASTNodeHandler delegate;
    ErrorHandler errorHandlerInstance;
    ErrorHandler* errorHandler;
    Scanner scannerInstance;
    Scanner* scanner;
    /*
    std::unordered_map<IdentifierNode*, RefPtr<ScannerResult>,
                       std::hash<IdentifierNode*>, std::equal_to<IdentifierNode*>, GCUtil::gc_malloc_ignore_off_page_allocator<std::pair<IdentifierNode*, RefPtr<ScannerResult>>>>
        nodeExtraInfo;
     */
    enum SourceType {
        Script,
        Module
    };
    SourceType sourceType;
    RefPtr<ScannerResult> lookahead;
    bool hasLineTerminator;

    Context contextInstance;
    Context* context;
    std::vector<RefPtr<ScannerResult>, gc_allocator_ignore_off_page<RefPtr<ScannerResult>>> tokens;
    Marker startMarker;
    Marker lastMarker;

    Vector<ASTScopeContext*, gc_allocator_ignore_off_page<ASTScopeContext*>> scopeContexts;
    bool trackUsingNames;
    size_t stackLimit;

    ASTScopeContext* popScopeContext(const MetaNode& node)
    {
        auto ret = scopeContexts.back();
        scopeContexts.pop_back();
        return ret;
    }

    void extractNamesFromFunctionParams(const PatternNodeVector& vector)
    {
        for (size_t i = 0; i < vector.size(); i++) {
            ASSERT(vector[i]->isIdentifier());
            IdentifierNode* id = (IdentifierNode*)vector[i];
            scopeContexts.back()->insertName(id->name(), true);
        }
    }

    void pushScopeContext(const PatternNodeVector& params, AtomicString functionName)
    {
        auto parentContext = scopeContexts.back();
        scopeContexts.push_back(new ASTScopeContext(this->context->strict));
        scopeContexts.back()->m_functionName = functionName;
        scopeContexts.back()->m_inCatch = this->context->inCatch;
        scopeContexts.back()->m_inWith = this->context->inWith;
        for (size_t i = 0; i < params.size(); i++) {
            ASSERT(params[i]->isIdentifier());
            IdentifierNode* id = (IdentifierNode*)params[i];
            scopeContexts.back()->m_parameters.pushBack(id->name());
        }
        if (parentContext) {
            parentContext->m_childScopes.push_back(scopeContexts.back());
        }
    }

    Parser(::Escargot::Context* escargotContext, StringView code, ParserASTNodeHandler delegate, size_t stackRemain, size_t startLine = 0, size_t startColumn = 0)
        : errorHandler(&errorHandlerInstance)
        , scannerInstance(code, this->errorHandler, startLine, startColumn)
    {
        if (stackRemain >= STACK_LIMIT_FROM_BASE) {
            stackRemain = STACK_LIMIT_FROM_BASE;
        }
        volatile int sp;
        volatile size_t currentStackBase = (size_t)&sp;
#ifdef STACK_GROWS_DOWN
        this->stackLimit = currentStackBase - stackRemain;
#else
        this->stackLimit = currentStackBase + stackRemain;
#endif
        this->escargotContext = escargotContext;
        trackUsingNames = true;
        config.range = false;
        config.loc = false;
        // config.source = String::emptyString;
        config.tokens = false;
        config.comment = false;
        config.tolerant = false;
        config.parseSingleFunction = false;
        config.parseSingleFunctionTarget = nullptr;
        config.parseSingleFunctionChildIndex = SmallValue((uint32_t)0);
        /*
        this->config = {
            range: (typeof options.range == 'boolean') && options.range,
            loc: (typeof options.loc == 'boolean') && options.loc,
            source: null,
            tokens: (typeof options.tokens == 'boolean') && options.tokens,
            comment: (typeof options.comment == 'boolean') && options.comment,
            tolerant: (typeof options.tolerant == 'boolean') && options.tolerant
        };
        if (this->config.loc && options.source && options.source !== null) {
            this->config.source = String(options.source);
        }*/

        this->delegate = delegate;

        this->scanner = &scannerInstance;

        // this->sourceType = (options && options.sourceType == 'module') ? 'module' : 'script';
        this->sourceType = Script;
        this->lookahead = nullptr;
        this->hasLineTerminator = false;

        this->context = &contextInstance;
        this->context->allowIn = true;
        this->context->allowYield = true;
        this->context->firstCoverInitializedNameError = nullptr;
        this->context->isAssignmentTarget = true;
        this->context->isBindingElement = true;
        this->context->inFunctionBody = false;
        this->context->inIteration = false;
        this->context->inSwitch = false;
        this->context->inCatch = false;
        this->context->inDirectCatchScope = false;
        this->context->inWith = false;
        this->context->inLoop = false;
        this->context->strict = this->sourceType == Module;

        this->startMarker.index = 0;
        this->startMarker.lineNumber = this->scanner->lineNumber;
        this->startMarker.lineStart = 0;

        this->lastMarker.index = 0;
        this->lastMarker.lineNumber = this->scanner->lineNumber;
        this->lastMarker.lineStart = 0;

        this->nextToken();
        this->lastMarker.index = this->scanner->index;
        this->lastMarker.lineNumber = this->scanner->lineNumber;
        this->lastMarker.lineStart = this->scanner->lineStart;
    }

    void throwError(const char* messageFormat, String* arg0 = String::emptyString, String* arg1 = String::emptyString, ErrorObject::Code code = ErrorObject::SyntaxError)
    {
        UTF16StringDataNonGCStd msg;
        if (arg0->length() && arg1->length()) {
            char message[512];
            UTF8StringData d1 = arg0->toUTF8StringData();
            UTF8StringData d2 = arg1->toUTF8StringData();
            snprintf(message, sizeof(message), messageFormat, d1.data(), d2.data());
            auto temp = utf8StringToUTF16String(message, strlen(message));
            msg = UTF16StringDataNonGCStd(temp.data(), temp.length());
        } else if (arg0->length()) {
            char message[512];
            UTF8StringData d1 = arg0->toUTF8StringData();
            snprintf(message, sizeof(message), messageFormat, d1.data());
            auto temp = utf8StringToUTF16String(message, strlen(message));
            msg = UTF16StringDataNonGCStd(temp.data(), temp.length());
        } else {
            msg.assign(messageFormat, &messageFormat[strlen(messageFormat)]);
        }

        size_t index = this->lastMarker.index;
        size_t line = this->lastMarker.lineNumber;
        size_t column = this->lastMarker.index - this->lastMarker.lineStart + 1;
        throw this->errorHandler->createError(index, line, column, new UTF16String(msg.data(), msg.length()), code);
    }

    void tolerateError(const char* messageFormat, String* arg0 = String::emptyString, String* arg1 = String::emptyString, ErrorObject::Code code = ErrorObject::SyntaxError)
    {
        throwError(messageFormat, arg0, arg1, code);
    }

    void replaceAll(UTF16StringDataNonGCStd& str, const UTF16StringDataNonGCStd& from, const UTF16StringDataNonGCStd& to)
    {
        if (from.empty())
            return;
        size_t start_pos = 0;
        while ((start_pos = str.find(from, start_pos)) != std::string::npos) {
            str.replace(start_pos, from.length(), to);
            start_pos += to.length();
        }
    }

    // Throw an exception because of the token.
    Error* unexpectedTokenError(RefPtr<ScannerResult> token = nullptr, const char* message = nullptr)
    {
        const char* msg;
        if (message)
            msg = message;
        else
            msg = Messages::UnexpectedToken;

        String* value;
        if (token) {
            if (!msg) {
                msg = (token->type == Token::EOFToken) ? Messages::UnexpectedEOS : (token->type == Token::IdentifierToken) ? Messages::UnexpectedIdentifier : (token->type == Token::NumericLiteralToken) ? Messages::UnexpectedNumber : (token->type == Token::StringLiteralToken) ? Messages::UnexpectedString : (token->type == Token::TemplateToken) ? Messages::UnexpectedTemplate : Messages::UnexpectedToken;

                if (token->type == Token::KeywordToken) {
                    if (this->scanner->isFutureReservedWord(token->valueString)) {
                        msg = Messages::UnexpectedReserved;
                    } else if (this->context->strict && this->scanner->isStrictModeReservedWord(token->valueString)) {
                        msg = Messages::StrictReservedWord;
                    }
                }
            }

            value = new StringView((token->type == Token::TemplateToken) ? token->valueTemplate.raw : token->valueString);
        } else {
            value = new ASCIIString("ILLEGAL");
        }

        // msg = msg.replace('%0', value);
        UTF16StringDataNonGCStd msgData;
        msgData.assign(msg, &msg[strlen(msg)]);
        UTF16StringDataNonGCStd valueData = UTF16StringDataNonGCStd(value->toUTF16StringData().data());
        replaceAll(msgData, UTF16StringDataNonGCStd(u"%s"), valueData);

        // if (token && typeof token.lineNumber == 'number') {
        if (token) {
            const size_t index = token->start;
            const size_t line = token->lineNumber;
            const size_t column = token->start - this->lastMarker.lineStart + 1;
            return this->errorHandler->createError(index, line, column, new UTF16String(msgData.data(), msgData.length()), ErrorObject::SyntaxError);
        } else {
            const size_t index = this->lastMarker.index;
            const size_t line = this->lastMarker.lineNumber;
            const size_t column = index - this->lastMarker.lineStart + 1;
            return this->errorHandler->createError(index, line, column, new UTF16String(msgData.data(), msgData.length()), ErrorObject::SyntaxError);
        }
    }

    void throwUnexpectedToken(RefPtr<ScannerResult> token, const char* message = nullptr)
    {
        throw this->unexpectedTokenError(token, message);
    }

    void tolerateUnexpectedToken(RefPtr<ScannerResult> token, const char* message = nullptr)
    {
        // this->errorHandler.tolerate(this->unexpectedTokenError(token, message));
        throwUnexpectedToken(token, message);
    }

    void collectComments()
    {
        this->scanner->scanComments();
        /*
        if (!this->config.comment) {
            this->scanner->scanComments();
        } else {
            const comments: Comment[] = this->scanner->scanComments();
            if (comments.length > 0 && this->delegate) {
                for (let i = 0; i < comments.length; ++i) {
                    const e: Comment = comments[i];
                    let node;
                    node = {
                        type: e.multiLine ? 'BlockComment' : 'LineComment',
                        value: this->scanner->source.slice(e.slice[0], e.slice[1])
                    };
                    if (this->config.range) {
                        node.range = e.range;
                    }
                    if (this->config.loc) {
                        node.loc = e.loc;
                    }
                    const metadata = {
                        start: {
                            line: e.loc.start.line,
                            column: e.loc.start.column,
                            offset: e.range[0]
                        },
                        end: {
                            line: e.loc.end.line,
                            column: e.loc.end.column,
                            offset: e.range[1]
                        }
                    };
                    this->delegate(node, metadata);
                }
            }
        }*/
    }

    RefPtr<ScannerResult> nextToken()
    {
        RefPtr<ScannerResult> token = this->lookahead;

        this->lastMarker.index = this->scanner->index;
        this->lastMarker.lineNumber = this->scanner->lineNumber;
        this->lastMarker.lineStart = this->scanner->lineStart;

        this->collectComments();

        this->startMarker.index = this->scanner->index;
        this->startMarker.lineNumber = this->scanner->lineNumber;
        this->startMarker.lineStart = this->scanner->lineStart;

        RefPtr<ScannerResult> next;
        next = this->scanner->lex();
        this->hasLineTerminator = (token && next) ? (token->lineNumber != next->lineNumber) : false;

        if (next && this->context->strict && next->type == Token::IdentifierToken) {
            if (this->scanner->isStrictModeReservedWord(next->valueString)) {
                next->type = Token::KeywordToken;
            }
        }
        this->lookahead = next;

        /*
        if (this->config.tokens && next.type !== Token.EOF) {
            this->tokens.push(this->convertToken(next));
        }
        */

        return token;
    }

    RefPtr<ScannerResult> nextRegexToken()
    {
        this->collectComments();

        RefPtr<ScannerResult> token = this->scanner->scanRegExp();
        /*
        if (this->config.tokens) {
            // Pop the previous token, '/' or '/='
            // This is added from the lookahead token.
            this->tokens.pop();

            this->tokens.push(this->convertToken(token));
        }*/

        // Prime the next lookahead.
        this->lookahead = token;
        this->nextToken();

        return token;
    }

    MetaNode createNode()
    {
        MetaNode n;
        n.index = this->startMarker.index;
        n.line = this->startMarker.lineNumber;
        n.column = this->startMarker.index - this->startMarker.lineStart;
        return n;
    }

    MetaNode startNode(RefPtr<ScannerResult> token)
    {
        MetaNode n;
        n.index = token->start;
        n.line = token->lineNumber;
        n.column = token->start - token->lineStart;
        return n;
    }

    template <typename T>
    T* finalize(MetaNode meta, T* node)
    {
        /*
        if (this->config.range) {
            node.range = [meta.index, this->lastMarker.index];
        }

        if (this->config.loc) {
            node.loc = {
                start: {
                    line: meta.line,
                    column: meta.column
                },
                end: {
                    line: this->lastMarker.lineNumber,
                    column: this->lastMarker.index - this->lastMarker.lineStart
                }
            };
            if (this->config.source) {
                node.loc.source = this->config.source;
            }
        }*/
        auto type = node->type();
        if (type == CallExpression) {
            CallExpressionNode* c = (CallExpressionNode*)node;
            if (c->callee()->isIdentifier()) {
                if (((IdentifierNode*)c->callee())->name().string()->equals("eval")) {
                    scopeContexts.back()->m_hasEval = true;
                }
            }
        } else if (type == WithStatement) {
            scopeContexts.back()->m_hasWith = true;
        } else if (type == YieldExpression) {
            scopeContexts.back()->m_hasYield = true;
        }

        node->m_loc = NodeLOC(meta.index);
        if (this->delegate) {
            this->delegate(node, NodeLOC(meta.index),
                           NodeLOC(this->lastMarker.index));
        }

        return node;
    }

    // Expect the next token to match the specified punctuator.
    // If not, an exception will be thrown.

    void expect(PunctuatorsKind value)
    {
        RefPtr<ScannerResult> token = this->nextToken();
        if (token->type != Token::PunctuatorToken || token->valuePunctuatorsKind != value) {
            this->throwUnexpectedToken(token);
        }
    }

    // Quietly expect a comma when in tolerant mode, otherwise delegates to expect().

    void expectCommaSeparator()
    {
        /*
        if (this->config.tolerant) {
            let token = this->lookahead;
            if (token.type == Token.Punctuator && token.value == ',') {
                this->nextToken();
            } else if (token.type == Token.Punctuator && token.value == ';') {
                this->nextToken();
                this->tolerateUnexpectedToken(token);
            } else {
                this->tolerateUnexpectedToken(token, Messages.UnexpectedToken);
            }
        } else {
            this->expect(',');
        }*/
        this->expect(PunctuatorsKind::Comma);
    }

    // Expect the next token to match the specified keyword.
    // If not, an exception will be thrown.

    void expectKeyword(KeywordKind keyword)
    {
        RefPtr<ScannerResult> token = this->nextToken();
        if (token->type != Token::KeywordToken || token->valueKeywordKind != keyword) {
            this->throwUnexpectedToken(token);
        }
    }

    // Return true if the next token matches the specified punctuator.

    bool match(PunctuatorsKind value)
    {
        return this->lookahead->type == Token::PunctuatorToken && this->lookahead->valuePunctuatorsKind == value;
    }

    // Return true if the next token matches the specified keyword

    bool matchKeyword(KeywordKind keyword)
    {
        return this->lookahead->type == Token::KeywordToken && this->lookahead->valueKeywordKind == keyword;
    }

    // Return true if the next token matches the specified contextual keyword
    // (where an identifier is sometimes a keyword depending on the context)

    bool matchContextualKeyword(KeywordKind keyword)
    {
        return this->lookahead->type == Token::IdentifierToken && this->lookahead->valueKeywordKind == keyword;
    }

    // Return true if the next token is an assignment operator

    bool matchAssign()
    {
        if (this->lookahead->type != Token::PunctuatorToken) {
            return false;
        }
        PunctuatorsKind op = this->lookahead->valuePunctuatorsKind;

        if (op >= Substitution && op < SubstitutionEnd) {
            return true;
        }
        return false;
    }

    // Cover grammar support.
    //
    // When an assignment expression position starts with an left parenthesis, the determination of the type
    // of the syntax is to be deferred arbitrarily long until the end of the parentheses pair (plus a lookahead)
    // or the first comma. This situation also defers the determination of all the expressions nested in the pair.
    //
    // There are three productions that can be parsed in a parentheses pair that needs to be determined
    // after the outermost pair is closed. They are:
    //
    //   1. AssignmentExpression
    //   2. BindingElements
    //   3. AssignmentTargets
    //
    // In order to avoid exponential backtracking, we use two flags to denote if the production can be
    // binding element or assignment target.
    //
    // The three productions have the relationship:
    //
    //   BindingElements ⊆ AssignmentTargets ⊆ AssignmentExpression
    //
    // with a single exception that CoverInitializedName when used directly in an Expression, generates
    // an early error. Therefore, we need the third state, firstCoverInitializedNameError, to track the
    // first usage of CoverInitializedName and report it when we reached the end of the parentheses pair.
    //
    // isolateCoverGrammar function runs the given parser function with a new cover grammar context, and it does not
    // effect the current flags. This means the production the parser parses is only used as an expression. Therefore
    // the CoverInitializedName check is conducted.
    //
    // inheritCoverGrammar function runs the given parse function with a new cover grammar context, and it propagates
    // the flags outside of the parser. This means the production the parser parses is used as a part of a potential
    // pattern. The CoverInitializedName check is deferred.

    typedef Node* (Parser::*ParseFunction)();

    void checkRecursiveLimit()
    {
        volatile int sp;
        size_t currentStackBase = (size_t)&sp;
#ifdef STACK_GROWS_DOWN
        if (currentStackBase < stackLimit) {
#else
        if (currentStackBase > stackLimit) {
#endif
            this->throwError("too many recursion in script", String::emptyString, String::emptyString, ErrorObject::RangeError);
        }
    }

    template <typename T>
    Node* isolateCoverGrammar(T parseFunction)
    {
        const bool previousIsBindingElement = this->context->isBindingElement;
        const bool previousIsAssignmentTarget = this->context->isAssignmentTarget;
        RefPtr<ScannerResult> previousFirstCoverInitializedNameError = this->context->firstCoverInitializedNameError;

        this->context->isBindingElement = true;
        this->context->isAssignmentTarget = true;
        this->context->firstCoverInitializedNameError = nullptr;

        this->checkRecursiveLimit();
        Node* result = (this->*parseFunction)();
        if (this->context->firstCoverInitializedNameError != nullptr) {
            this->throwUnexpectedToken(this->context->firstCoverInitializedNameError);
        }

        this->context->isBindingElement = previousIsBindingElement;
        this->context->isAssignmentTarget = previousIsAssignmentTarget;
        this->context->firstCoverInitializedNameError = previousFirstCoverInitializedNameError;

        return result;
    }

    template <typename T>
    Node* isolateCoverGrammarWithFunctor(T parseFunction)
    {
        const bool previousIsBindingElement = this->context->isBindingElement;
        const bool previousIsAssignmentTarget = this->context->isAssignmentTarget;
        RefPtr<ScannerResult> previousFirstCoverInitializedNameError = this->context->firstCoverInitializedNameError;

        this->context->isBindingElement = true;
        this->context->isAssignmentTarget = true;
        this->context->firstCoverInitializedNameError = nullptr;

        this->checkRecursiveLimit();
        Node* result = parseFunction();
        if (this->context->firstCoverInitializedNameError != nullptr) {
            this->throwUnexpectedToken(this->context->firstCoverInitializedNameError);
        }

        this->context->isBindingElement = previousIsBindingElement;
        this->context->isAssignmentTarget = previousIsAssignmentTarget;
        this->context->firstCoverInitializedNameError = previousFirstCoverInitializedNameError;

        return result;
    }

    template <typename T>
    Node* inheritCoverGrammar(T parseFunction)
    {
        const bool previousIsBindingElement = this->context->isBindingElement;
        const bool previousIsAssignmentTarget = this->context->isAssignmentTarget;
        RefPtr<ScannerResult> previousFirstCoverInitializedNameError = this->context->firstCoverInitializedNameError;

        this->context->isBindingElement = true;
        this->context->isAssignmentTarget = true;
        this->context->firstCoverInitializedNameError = nullptr;

        this->checkRecursiveLimit();
        Node* result = (this->*parseFunction)();

        this->context->isBindingElement = this->context->isBindingElement && previousIsBindingElement;
        this->context->isAssignmentTarget = this->context->isAssignmentTarget && previousIsAssignmentTarget;
        if (previousFirstCoverInitializedNameError)
            this->context->firstCoverInitializedNameError = previousFirstCoverInitializedNameError;

        return result;
    }

    void consumeSemicolon()
    {
        if (this->match(PunctuatorsKind::SemiColon)) {
            this->nextToken();
        } else if (!this->hasLineTerminator) {
            if (this->lookahead->type != Token::EOFToken && !this->match(PunctuatorsKind::RightBrace)) {
                this->throwUnexpectedToken(this->lookahead);
            }
            this->lastMarker.index = this->startMarker.index;
            this->lastMarker.lineNumber = this->startMarker.lineNumber;
            this->lastMarker.lineStart = this->startMarker.lineStart;
        }
    }

    IdentifierNode* finishIdentifier(RefPtr<ScannerResult> token, bool isScopeVariableName)
    {
        auto ret = new IdentifierNode(AtomicString(this->escargotContext, token->valueString));
        // nodeExtraInfo.insert(std::make_pair(ret, token));
        if (trackUsingNames)
            scopeContexts.back()->insertUsingName(ret->name());
        return ret;
    }

#define DEFINE_AS_NODE(TypeName)                \
    TypeName##Node* as##TypeName##Node(Node* n) \
    {                                           \
        if (!n)                                 \
            return (TypeName##Node*)n;          \
        ASSERT(n->is##TypeName##Node());        \
        return (TypeName##Node*)n;              \
    }

    DEFINE_AS_NODE(Expression);
    DEFINE_AS_NODE(Statement);

    // ECMA-262 12.2 Primary Expressions

    Node* parsePrimaryExpression()
    {
        MetaNode node = this->createNode();

        Node* expr;
        // let value, token, raw;
        RefPtr<ScannerResult> token;

        switch (this->lookahead->type) {
        case Token::IdentifierToken:
            if (this->sourceType == SourceType::Module && this->lookahead->valueKeywordKind == KeywordKind::Await) {
                this->tolerateUnexpectedToken(this->lookahead);
            }
            expr = this->finalize(node, finishIdentifier(this->nextToken(), true));
            break;

        case Token::NumericLiteralToken:
        case Token::StringLiteralToken:
            if (this->context->strict && this->lookahead->octal) {
                this->tolerateUnexpectedToken(this->lookahead, Messages::StrictOctalLiteral);
            }
            if (this->context->strict && this->lookahead->startWithZero) {
                this->tolerateUnexpectedToken(this->lookahead, Messages::StrictLeadingZeroLiteral);
            }
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
            token = this->nextToken();
            // raw = this->getTokenRaw(token);
            if (token->type == Token::NumericLiteralToken) {
                if (this->context->inLoop || token->valueNumber == 0)
                    this->scopeContexts.back()->insertNumeralLiteral(Value(token->valueNumber));
                expr = this->finalize(node, new LiteralNode(Value(token->valueNumber)));
            } else
                expr = this->finalize(node, new LiteralNode(Value(new StringView(token->valueString))));
            break;

        case Token::BooleanLiteralToken:
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
            token = this->nextToken();
            // token.value = (token.value === 'true');
            // raw = this->getTokenRaw(token);
            {
                bool value = token->valueString == "true";
                this->scopeContexts.back()->insertNumeralLiteral(Value(value));
                expr = this->finalize(node, new LiteralNode(Value(value)));
            }
            break;

        case Token::NullLiteralToken:
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
            token = this->nextToken();
            // token.value = null;
            // raw = this->getTokenRaw(token);
            this->scopeContexts.back()->insertNumeralLiteral(Value(Value::Null));
            expr = this->finalize(node, new LiteralNode(Value(Value::Null)));
            break;

        case Token::TemplateToken:
            expr = this->parseTemplateLiteral();
            break;

        case Token::PunctuatorToken: {
            PunctuatorsKind value = this->lookahead->valuePunctuatorsKind;
            switch (value) {
            case LeftParenthesis:
                this->context->isBindingElement = false;
                expr = this->inheritCoverGrammar(&Parser::parseGroupExpression);
                break;
            case LeftSquareBracket:
                expr = this->inheritCoverGrammar(&Parser::parseArrayInitializer);
                break;
            case LeftBrace:
                expr = this->inheritCoverGrammar(&Parser::parseObjectInitializer);
                break;
            case Divide:
            case DivideEqual:
                this->context->isAssignmentTarget = false;
                this->context->isBindingElement = false;
                this->scanner->index = this->startMarker.index;
                token = this->nextRegexToken();
                // raw = this->getTokenRaw(token);
                expr = this->finalize(node, new RegExpLiteralNode(token->valueRegexp.body, token->valueRegexp.flags));
                break;
            default:
                this->throwUnexpectedToken(this->nextToken());
            }
            break;
        }

        case Token::KeywordToken:
            if (!this->context->strict && this->context->allowYield && this->matchKeyword(KeywordKind::Yield)) {
                expr = this->parseIdentifierName();
            } else if (!this->context->strict && this->matchKeyword(KeywordKind::Let)) {
                throwUnexpectedToken(this->nextToken());
            } else {
                this->context->isAssignmentTarget = false;
                this->context->isBindingElement = false;
                if (this->matchKeyword(KeywordKind::Function)) {
                    expr = this->parseFunctionExpression();
                } else if (this->matchKeyword(KeywordKind::This)) {
                    this->nextToken();
                    expr = this->finalize(node, new ThisExpressionNode());
                } else if (this->matchKeyword(KeywordKind::Class)) {
                    // TODO
                    this->throwUnexpectedToken(this->nextToken());
                    // expr = this->parseClassExpression();
                } else {
                    this->throwUnexpectedToken(this->nextToken());
                }
            }
            break;

        default:
            this->throwUnexpectedToken(this->nextToken());
        }

        return expr;
    }

    struct ParseParameterOptions {
        PatternNodeVector params;
        std::vector<AtomicString, gc_allocator<AtomicString>> paramSet;
        RefPtr<ScannerResult> stricted;
        const char* message;
        RefPtr<ScannerResult> firstRestricted;
        ParseParameterOptions()
        {
            firstRestricted = nullptr;
            stricted = nullptr;
            message = nullptr;
        }
    };


    void validateParam(ParseParameterOptions& options, RefPtr<ScannerResult> param, AtomicString name)
    {
        if (this->context->strict) {
            if (this->scanner->isRestrictedWord(name)) {
                options.stricted = param;
                options.message = Messages::StrictParamName;
            }
            if (std::find(options.paramSet.begin(), options.paramSet.end(), name) != options.paramSet.end()) {
                options.stricted = param;
                options.message = Messages::StrictParamDupe;
            }
        } else if (!options.firstRestricted) {
            if (this->scanner->isRestrictedWord(name)) {
                options.firstRestricted = param;
                options.message = Messages::StrictParamName;
            } else if (this->scanner->isStrictModeReservedWord(name)) {
                options.firstRestricted = param;
                options.message = Messages::StrictReservedWord;
            } else if (std::find(options.paramSet.begin(), options.paramSet.end(), name) != options.paramSet.end()) {
                options.stricted = param;
                options.message = Messages::StrictParamDupe;
            }
        }
        options.paramSet.push_back(name);
    }

    RestElementNode* parseRestElement(std::vector<RefPtr<ScannerResult>, GCUtil::gc_malloc_ignore_off_page_allocator<RefPtr<ScannerResult>>>& params)
    {
        MetaNode node = this->createNode();

        this->throwError("Rest element is not supported yet");

        this->nextToken();
        if (this->match(LeftBrace)) {
            this->throwError(Messages::ObjectPatternAsRestParameter);
        }
        params.push_back(this->lookahead);

        IdentifierNode* param = this->parseVariableIdentifier();
        if (this->match(Equal)) {
            this->throwError(Messages::DefaultRestParameter);
        }
        if (!this->match(RightParenthesis)) {
            this->throwError(Messages::ParameterAfterRestParameter);
        }

        return this->finalize(node, new RestElementNode(param));
    }

    Node* parsePattern(std::vector<RefPtr<ScannerResult>, GCUtil::gc_malloc_ignore_off_page_allocator<RefPtr<ScannerResult>>>& params, String* kind = String::emptyString)
    {
        Node* pattern;

        if (this->match(LeftSquareBracket)) {
            this->throwError("Array pattern is not supported yet");
            RELEASE_ASSERT_NOT_REACHED();
            // pattern = this->parseArrayPattern(params, kind);
        } else if (this->match(LeftBrace)) {
            this->throwError("Object pattern is not supported yet");
            RELEASE_ASSERT_NOT_REACHED();
            // pattern = this->parseObjectPattern(params, kind);
        } else {
            if (this->matchKeyword(KeywordKind::Let) && (kind->equals("const") || kind->equals("let"))) {
                this->tolerateUnexpectedToken(this->lookahead, Messages::UnexpectedToken);
            }
            params.push_back(this->lookahead);
            pattern = this->parseVariableIdentifier(kind);
        }

        return pattern;
    }

    Node* parsePatternWithDefault(std::vector<RefPtr<ScannerResult>, GCUtil::gc_malloc_ignore_off_page_allocator<RefPtr<ScannerResult>>>& params, String* kind = String::emptyString)
    {
        RefPtr<ScannerResult> startToken = this->lookahead;

        Node* pattern = this->parsePattern(params, kind);
        if (this->match(PunctuatorsKind::Substitution)) {
            this->throwError("Assignment in parameter is not supported yet");

            this->nextToken();
            const bool previousAllowYield = this->context->allowYield;
            this->context->allowYield = true;
            Node* right = this->isolateCoverGrammar(&Parser::parseAssignmentExpression);
            this->context->allowYield = previousAllowYield;
            pattern = this->finalize(this->startNode(startToken), new AssignmentExpressionSimpleNode(pattern, right));
        }

        return pattern;
    }

    bool parseFormalParameter(ParseParameterOptions& options)
    {
        Node* param;
        trackUsingNames = false;
        std::vector<RefPtr<ScannerResult>, GCUtil::gc_malloc_ignore_off_page_allocator<RefPtr<ScannerResult>>> params;
        RefPtr<ScannerResult> token = this->lookahead;
        if (token->type == Token::PunctuatorToken && token->valuePunctuatorsKind == PunctuatorsKind::PeriodPeriodPeriod) {
            RestElementNode* param = this->parseRestElement(params);
            this->validateParam(options, params.back(), param->argument()->name());
            options.params.push_back(param);
            trackUsingNames = true;
            return false;
        }

        param = this->parsePatternWithDefault(params);
        for (size_t i = 0; i < params.size(); i++) {
            AtomicString as(this->escargotContext, params[i]->valueString);
            this->validateParam(options, params[i], as);
        }
        options.params.push_back(param);
        trackUsingNames = true;
        return !this->match(PunctuatorsKind::RightParenthesis);
    }

    struct ParseFormalParametersResult {
        PatternNodeVector params;
        RefPtr<ScannerResult> stricted;
        RefPtr<ScannerResult> firstRestricted;
        const char* message;
        ParseFormalParametersResult(PatternNodeVector params, RefPtr<ScannerResult> stricted, RefPtr<ScannerResult> firstRestricted, const char* message)
        {
            this->params = std::move(params);
            this->stricted = stricted;
            this->firstRestricted = firstRestricted;
            this->message = nullptr;
        }
    };

    ParseFormalParametersResult parseFormalParameters(RefPtr<ScannerResult> firstRestricted = nullptr)
    {
        ParseParameterOptions options;

        options.firstRestricted = firstRestricted;

        this->expect(LeftParenthesis);
        if (!this->match(RightParenthesis)) {
            options.paramSet.clear();
            while (this->startMarker.index < this->scanner->length) {
                if (!this->parseFormalParameter(options)) {
                    break;
                }
                this->expect(Comma);
            }
        }
        this->expect(RightParenthesis);

        return ParseFormalParametersResult(options.params, options.stricted, options.firstRestricted, options.message);
    }

    // ECMA-262 12.2.5 Array Initializer

    SpreadElementNode* parseSpreadElement()
    {
        MetaNode node = this->createNode();
        this->expect(PunctuatorsKind::PeriodPeriodPeriod);
        Node* arg = this->inheritCoverGrammar(&Parser::parseAssignmentExpression);
        this->throwError("Spread element is not supported yet");
        return this->finalize(node, new SpreadElementNode(arg));
    }

    Node* parseArrayInitializer()
    {
        MetaNode node = this->createNode();
        // const elements: Node.ArrayExpressionElement[] = [];
        ExpressionNodeVector elements;

        this->expect(LeftSquareBracket);
        while (!this->match(RightSquareBracket)) {
            if (this->match(Comma)) {
                this->nextToken();
                elements.push_back(nullptr);
            } else if (this->match(PeriodPeriodPeriod)) {
                SpreadElementNode* element = this->parseSpreadElement();
                if (!this->match(RightSquareBracket)) {
                    this->context->isAssignmentTarget = false;
                    this->context->isBindingElement = false;
                    this->expect(Comma);
                }
                elements.push_back(element);
            } else {
                elements.push_back(this->inheritCoverGrammar(&Parser::parseAssignmentExpression));
                if (!this->match(RightSquareBracket)) {
                    this->expect(Comma);
                }
            }
        }
        this->expect(RightSquareBracket);

        return this->finalize(node, new ArrayExpressionNode(std::move(elements)));
    }

    // ECMA-262 12.2.6 Object Initializer

    Node* parsePropertyMethod(ParseFormalParametersResult& params)
    {
        this->context->isAssignmentTarget = false;
        this->context->isBindingElement = false;

        pushScopeContext(params.params, AtomicString());
        extractNamesFromFunctionParams(params.params);
        const bool previousStrict = this->context->strict;
        Node* body = this->isolateCoverGrammar(&Parser::parseFunctionSourceElements);
        if (this->context->strict && params.firstRestricted) {
            this->tolerateUnexpectedToken(params.firstRestricted, params.message);
        }
        if (this->context->strict && params.stricted) {
            this->tolerateUnexpectedToken(params.stricted, params.message);
        }
        this->context->strict = previousStrict;

        return body;
    }

    FunctionExpressionNode* parsePropertyMethodFunction()
    {
        const bool isGenerator = false;
        MetaNode node = this->createNode();

        const bool previousAllowYield = this->context->allowYield;
        this->context->allowYield = false;
        ParseFormalParametersResult params = this->parseFormalParameters();
        Node* method = this->parsePropertyMethod(params);
        this->context->allowYield = previousAllowYield;

        return this->finalize(node, new FunctionExpressionNode(AtomicString(), std::move(params.params), method, popScopeContext(node), isGenerator));
    }

    Node* parseObjectPropertyKey()
    {
        MetaNode node = this->createNode();
        RefPtr<ScannerResult> token = this->nextToken();

        Node* key = nullptr;
        switch (token->type) {
        case Token::NumericLiteralToken:
        case Token::StringLiteralToken:
            if (this->context->strict && token->octal) {
                this->tolerateUnexpectedToken(token, Messages::StrictOctalLiteral);
            }
            if (this->context->strict && this->lookahead->startWithZero) {
                this->tolerateUnexpectedToken(this->lookahead, Messages::StrictLeadingZeroLiteral);
            }
            // const raw = this->getTokenRaw(token);
            {
                Value v;
                if (token->type == Token::NumericLiteralToken) {
                    if (this->context->inLoop || token->valueNumber == 0)
                        this->scopeContexts.back()->insertNumeralLiteral(Value(token->valueNumber));
                    v = Value(token->valueNumber);
                } else {
                    v = Value(new StringView(token->valueString));
                }
                key = this->finalize(node, new LiteralNode(v));
            }
            break;

        case Token::IdentifierToken:
        case Token::BooleanLiteralToken:
        case Token::NullLiteralToken:
        case Token::KeywordToken:
            this->trackUsingNames = false;
            key = this->finalize(node, finishIdentifier(token, false));
            this->trackUsingNames = true;
            break;

        case Token::PunctuatorToken:
            if (token->valuePunctuatorsKind == LeftSquareBracket) {
                key = this->isolateCoverGrammar(&Parser::parseAssignmentExpression);
                this->expect(RightSquareBracket);
            } else {
                this->throwUnexpectedToken(token);
            }
            break;

        default:
            this->throwUnexpectedToken(token);
        }

        return key;
    }

    bool qualifiedPropertyName(RefPtr<ScannerResult> token)
    {
        switch (token->type) {
        case Token::IdentifierToken:
        case Token::StringLiteralToken:
        case Token::BooleanLiteralToken:
        case Token::NullLiteralToken:
        case Token::NumericLiteralToken:
        case Token::KeywordToken:
            return true;
        case Token::PunctuatorToken:
            return token->valuePunctuatorsKind == LeftSquareBracket;
        default:
            return false;
        }
    }


    bool isPropertyKey(Node* key, const char* value)
    {
        if (key->type() == Identifier) {
            return ((IdentifierNode*)key)->name() == value;
        } else if (key->type() == Literal) {
            if (((LiteralNode*)key)->value().isString()) {
                return ((LiteralNode*)key)->value().asString()->equals(value);
            }
        }

        return false;
    }

    PropertyNode* parseObjectProperty(bool& hasProto, std::vector<std::pair<AtomicString, size_t>>& usedNames) //: Node.Property
    {
        MetaNode node = this->createNode();
        RefPtr<ScannerResult> token = this->lookahead;

        PropertyNode::Kind kind;
        Node* key = nullptr; //'': Node.PropertyKey;
        Node* value = nullptr; //: Node.PropertyValue;

        bool computed = false;
        bool method = false;
        bool shorthand = false;

        if (token->type == Token::IdentifierToken) {
            this->nextToken();
            key = this->finalize(node, finishIdentifier(token, true));
        } else if (this->match(PunctuatorsKind::Multiply)) {
            this->nextToken();
        } else {
            computed = this->match(LeftSquareBracket);
            key = this->parseObjectPropertyKey();
        }

        bool lookaheadPropertyKey = this->qualifiedPropertyName(this->lookahead);
        if (token->type == Token::IdentifierToken && token->valueString == "get" && lookaheadPropertyKey) {
            kind = PropertyNode::Kind::Get;
            computed = this->match(LeftSquareBracket);
            key = this->parseObjectPropertyKey();
            this->context->allowYield = false;
            value = this->parseGetterMethod();

        } else if (token->type == Token::IdentifierToken && token->valueString == "set" && lookaheadPropertyKey) {
            kind = PropertyNode::Kind::Set;
            computed = this->match(LeftSquareBracket);
            key = this->parseObjectPropertyKey();
            value = this->parseSetterMethod();

        } else if (token->type == Token::PunctuatorToken && token->valueString == "*" && lookaheadPropertyKey) {
            kind = PropertyNode::Kind::Init;
            computed = this->match(LeftSquareBracket);
            key = this->parseObjectPropertyKey();
            value = this->parseGeneratorMethod();
            method = true;

        } else {
            if (!key) {
                this->throwUnexpectedToken(this->lookahead);
            }

            kind = PropertyNode::Kind::Init;
            if (this->match(PunctuatorsKind::Colon)) {
                if (!computed && this->isPropertyKey(key, "__proto__")) {
                    if (hasProto) {
                        this->tolerateError(Messages::DuplicateProtoProperty);
                    }
                    hasProto = true;
                }
                this->nextToken();
                value = this->inheritCoverGrammar(&Parser::parseAssignmentExpression);

                /* TODO(ES6) this part is only for es6
            } else if (this->match(LeftParenthesis)) {
                value = this->parsePropertyMethodFunction();
                method = true;

            } else if (token->type == Token::IdentifierToken) {
                Node* id = this->finalize(node, finishIdentifier(token, true));
                if (this->match(Substitution)) {
                    this->context->firstCoverInitializedNameError = this->lookahead;
                    this->nextToken();
                    shorthand = true;
                    Node* init = this->isolateCoverGrammar(&Parser::parseAssignmentExpression);
                    value = this->finalize(node, new AssignmentExpressionSimpleNode(id, init));
                } else {
                    shorthand = true;
                    value = id;
                }
            */
            } else {
                this->throwUnexpectedToken(this->nextToken());
            }
        }

        if (key->isIdentifier()) {
            AtomicString as = key->asIdentifier()->name();
            bool seenInit = kind == PropertyNode::Kind::Init;
            bool seenGet = kind == PropertyNode::Kind::Get;
            bool seenSet = kind == PropertyNode::Kind::Set;
            for (size_t i = 0; i < usedNames.size(); i++) {
                if (usedNames[i].first == as) {
                    if (usedNames[i].second == PropertyNode::Kind::Init) {
                        if (this->context->strict) {
                            if (seenInit || seenGet || seenSet) {
                                this->throwError("invalid object literal");
                            }
                        } else {
                            if (seenGet || seenSet) {
                                this->throwError("invalid object literal");
                            }
                        }
                        seenInit = true;
                    } else if (usedNames[i].second == PropertyNode::Kind::Get) {
                        if (seenInit || seenGet) {
                            this->throwError("invalid object literal");
                        }
                        seenGet = true;
                    } else if (usedNames[i].second == PropertyNode::Kind::Set) {
                        if (seenInit || seenSet) {
                            this->throwError("invalid object literal");
                        }
                        seenSet = true;
                    }
                }
            }
            usedNames.push_back(std::make_pair(as, kind));
        }

        // return this->finalize(node, new PropertyNode(kind, key, computed, value, method, shorthand));
        return this->finalize(node, new PropertyNode(key, value, kind, computed));
    }

    Node* parseObjectInitializer()
    {
        MetaNode node = this->createNode();

        this->expect(LeftBrace);
        PropertiesNodeVector properties;
        bool hasProto = false;
        std::vector<std::pair<AtomicString, size_t>> usedNames;
        while (!this->match(RightBrace)) {
            properties.push_back(this->parseObjectProperty(hasProto, usedNames));
            if (!this->match(RightBrace)) {
                this->expectCommaSeparator();
            }
        }
        this->expect(RightBrace);

        return this->finalize(node, new ObjectExpressionNode(std::move(properties)));
    }

    // ECMA-262 12.2.9 Template Literals
    Node* parseTemplateLiteral()
    {
        this->throwError("Template literal is not supported yet");
        RELEASE_ASSERT_NOT_REACHED();
    }
    /*
     parseTemplateHead(): Node.TemplateElement {
         assert(this->lookahead.head, 'Template literal must start with a template head');

         const node = this->createNode();
         const token = this->nextToken();
         const value = {
             raw: token.value.raw,
             cooked: token.value.cooked
         };

         return this->finalize(node, new Node.TemplateElement(value, token.tail));
     }

     parseTemplateElement(): Node.TemplateElement {
         if (this->lookahead.type !== Token.Template) {
             this->throwUnexpectedToken();
         }

         const node = this->createNode();
         const token = this->nextToken();
         const value = {
             raw: token.value.raw,
             cooked: token.value.cooked
         };

         return this->finalize(node, new Node.TemplateElement(value, token.tail));
     }

     parseTemplateLiteral(): Node.TemplateLiteral {
         const node = this->createNode();

         const expressions = [];
         const quasis = [];

         let quasi = this->parseTemplateHead();
         quasis.push(quasi);
         while (!quasi.tail) {
             expressions.push(this->parseExpression());
             quasi = this->parseTemplateElement();
             quasis.push(quasi);
         }

         return this->finalize(node, new Node.TemplateLiteral(quasis, expressions));
     }

     // ECMA-262 12.2.10 The Grouping Operator

    reinterpretExpressionAsPattern(expr) {
        switch (expr.type) {
            case Syntax.Identifier:
            case Syntax.MemberExpression:
            case Syntax.RestElement:
            case Syntax.AssignmentPattern:
                break;
            case Syntax.SpreadElement:
                expr.type = Syntax.RestElement;
                this->reinterpretExpressionAsPattern(expr.argument);
                break;
            case Syntax.ArrayExpression:
                expr.type = Syntax.ArrayPattern;
                for (let i = 0; i < expr.elements.length; i++) {
                    if (expr.elements[i] !== null) {
                        this->reinterpretExpressionAsPattern(expr.elements[i]);
                    }
                }
                break;
            case Syntax.ObjectExpression:
                expr.type = Syntax.ObjectPattern;
                for (let i = 0; i < expr.properties.length; i++) {
                    this->reinterpretExpressionAsPattern(expr.properties[i].value);
                }
                break;
            case Syntax.AssignmentExpression:
                expr.type = Syntax.AssignmentPattern;
                delete expr.operator;
                this->reinterpretExpressionAsPattern(expr.left);
                break;
            default:
                // Allow other node type for tolerant parsing.
                break;
        }
    }

    parseGroupExpression(): ArrowParameterPlaceHolderNode | Node.Expression {
        let expr;

        this->expect('(');
        if (this->match(')')) {
            this->nextToken();
            if (!this->match('=>')) {
                this->expect('=>');
            }
            expr = {
                type: ArrowParameterPlaceHolder,
                params: []
            };
        } else {
            const startToken = this->lookahead;
            let params = [];
            if (this->match('...')) {
                expr = this->parseRestElement(params);
                this->expect(')');
                if (!this->match('=>')) {
                    this->expect('=>');
                }
                expr = {
                    type: ArrowParameterPlaceHolder,
                    params: [expr]
                };
            } else {
                let arrow = false;
                this->context.isBindingElement = true;
                expr = this->inheritCoverGrammar(this->parseAssignmentExpression);

                if (this->match(',')) {
                    const expressions = [];

                    this->context.isAssignmentTarget = false;
                    expressions.push(expr);
                    while (this->startMarker.index < this->scanner.length) {
                        if (!this->match(',')) {
                            break;
                        }
                        this->nextToken();

                        if (this->match('...')) {
                            if (!this->context.isBindingElement) {
                                this->throwUnexpectedToken(this->lookahead);
                            }
                            expressions.push(this->parseRestElement(params));
                            this->expect(')');
                            if (!this->match('=>')) {
                                this->expect('=>');
                            }
                            this->context.isBindingElement = false;
                            for (let i = 0; i < expressions.length; i++) {
                                this->reinterpretExpressionAsPattern(expressions[i]);
                            }
                            arrow = true;
                            expr = {
                                type: ArrowParameterPlaceHolder,
                                params: expressions
                            };
                        } else {
                            expressions.push(this->inheritCoverGrammar(this->parseAssignmentExpression));
                        }
                        if (arrow) {
                            break;
                        }
                    }
                    if (!arrow) {
                        expr = this->finalize(this->startNode(startToken), new Node.SequenceExpression(expressions));
                    }
                }

                if (!arrow) {
                    this->expect(')');
                    if (this->match('=>')) {
                        if (expr.type === Syntax.Identifier && expr.name === 'yield') {
                            arrow = true;
                            expr = {
                                type: ArrowParameterPlaceHolder,
                                params: [expr]
                            };
                        }
                        if (!arrow) {
                            if (!this->context.isBindingElement) {
                                this->throwUnexpectedToken(this->lookahead);
                            }

                            if (expr.type === Syntax.SequenceExpression) {
                                for (let i = 0; i < expr.expressions.length; i++) {
                                    this->reinterpretExpressionAsPattern(expr.expressions[i]);
                                }
                            } else {
                                this->reinterpretExpressionAsPattern(expr);
                            }

                            const params = (expr.type === Syntax.SequenceExpression ? expr.expressions : [expr]);
                            expr = {
                                type: ArrowParameterPlaceHolder,
                                params: params
                            };
                        }
                    }
                    this->context.isBindingElement = false;
                }
            }
        }

        return expr;
    }
*/
    void reinterpretExpressionAsPattern(Node* expr)
    {
        switch (expr->type()) {
        case ArrayExpression:
            this->throwError("Array pattern is not supported yet");
            RELEASE_ASSERT_NOT_REACHED();
            /* TODO(ES6) this part is only for es6
            expr.type = Syntax.ArrayPattern;
            for (let i = 0; i < expr.elements.length; i++) {
                if (expr.elements[i] !== null) {
                    this->reinterpretExpressionAsPattern(expr.elements[i]);
                }
            }
            */
            break;
        case ObjectExpression:
            this->throwError("Object pattern is not supported yet");
            RELEASE_ASSERT_NOT_REACHED();
            /* TODO(ES6) this part is only for es6
            expr.type = Syntax.ObjectPattern;
            for (let i = 0; i < expr.properties.length; i++) {
                this->reinterpretExpressionAsPattern(expr.properties[i].value);
            }
            */
            break;
        default:
            break;
        }
    }

    Node* parseGroupExpression()
    {
        Node* expr;

        this->expect(LeftParenthesis);
        if (this->match(RightParenthesis)) {
            this->throwError("Arrow function is not supported yet");
            RELEASE_ASSERT_NOT_REACHED();
        } else {
            RefPtr<ScannerResult> startToken = this->lookahead;
            this->context->isBindingElement = true;
            expr = this->inheritCoverGrammar(&Parser::parseAssignmentExpression);

            if (this->match(Comma)) {
                ExpressionNodeVector expressions;

                this->context->isAssignmentTarget = false;
                expressions.push_back(expr);
                while (this->startMarker.index < this->scanner->length) {
                    if (!this->match(Comma)) {
                        break;
                    }
                    this->nextToken();

                    expressions.push_back(this->inheritCoverGrammar(&Parser::parseAssignmentExpression));
                }
                expr = this->finalize(this->startNode(startToken), new SequenceExpressionNode(std::move(expressions)));
            }
        }
        this->expect(RightParenthesis);

        return expr;
    }
    // ECMA-262 12.3 Left-Hand-Side Expressions

    ArgumentVector parseArguments()
    {
        this->expect(LeftParenthesis);
        ArgumentVector args;
        if (!this->match(RightParenthesis)) {
            while (true) {
                Node* expr = this->match(PeriodPeriodPeriod) ? this->parseSpreadElement() : this->isolateCoverGrammar(&Parser::parseAssignmentExpression);
                args.push_back(expr);
                if (this->match(RightParenthesis)) {
                    break;
                }
                this->expectCommaSeparator();
            }
        }
        this->expect(RightParenthesis);

        return args;
    }

    bool isIdentifierName(RefPtr<ScannerResult> token)
    {
        return token->type == Token::IdentifierToken || token->type == Token::KeywordToken || token->type == Token::BooleanLiteralToken || token->type == Token::NullLiteralToken;
    }

    IdentifierNode* parseIdentifierName()
    {
        MetaNode node = this->createNode();
        RefPtr<ScannerResult> token = this->nextToken();
        if (!this->isIdentifierName(token)) {
            this->throwUnexpectedToken(token);
        }
        return this->finalize(node, finishIdentifier(token, true));
    }

    Node* parseNewExpression()
    {
        MetaNode node = this->createNode();

        IdentifierNode* id = this->parseIdentifierName();
        // assert(id.name === 'new', 'New expression must start with `new`');

        Node* expr;
        if (this->match(Period)) {
            this->nextToken();
            if (this->lookahead->type == Token::IdentifierToken && this->context->inFunctionBody && this->lookahead->valueString == "target") {
                // TODO
                IdentifierNode* property = this->parseIdentifierName();
                this->throwError("Meta property is not supported yet");
                RELEASE_ASSERT_NOT_REACHED();
                // expr = new Node.MetaProperty(id, property);
            } else {
                this->throwUnexpectedToken(this->lookahead);
            }
        } else {
            Node* callee = this->isolateCoverGrammar(&Parser::parseLeftHandSideExpression);
            ArgumentVector args;
            if (this->match(LeftParenthesis))
                args = this->parseArguments();
            if (args.size() > 65535) {
                this->throwError("too many arguments in new");
            }
            expr = new NewExpressionNode(callee, std::move(args));
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
        }

        return this->finalize(node, expr);
    }

    Node* parseLeftHandSideExpressionAllowCall()
    {
        RefPtr<ScannerResult> startToken = this->lookahead;
        bool previousAllowIn = this->context->allowIn;
        this->context->allowIn = true;

        Node* expr;
        if (this->matchKeyword(Super) && this->context->inFunctionBody) {
            MetaNode node = this->createNode();
            this->nextToken();
            this->throwError("super keyword is not supported yet");
            RELEASE_ASSERT_NOT_REACHED();
            // expr = this->finalize(node, new Node.Super());
            if (!this->match(LeftParenthesis) && !this->match(Period) && !this->match(LeftSquareBracket)) {
                this->throwUnexpectedToken(this->lookahead);
            }
        } else {
            expr = this->inheritCoverGrammar(this->matchKeyword(New) ? &Parser::parseNewExpression : &Parser::parsePrimaryExpression);
        }

        while (true) {
            if (this->match(Period)) {
                this->context->isBindingElement = false;
                this->context->isAssignmentTarget = true;
                this->expect(Period);
                this->trackUsingNames = false;
                IdentifierNode* property = this->parseIdentifierName();
                this->trackUsingNames = true;
                expr = this->finalize(this->startNode(startToken), new MemberExpressionNode(expr, property, true));

            } else if (this->match(LeftParenthesis)) {
                this->context->isBindingElement = false;
                this->context->isAssignmentTarget = false;
                ArgumentVector args = this->parseArguments();
                if (args.size() > 65535) {
                    this->throwError("too many arguments in call");
                }
                expr = this->finalize(this->startNode(startToken), new CallExpressionNode(expr, std::move(args)));

            } else if (this->match(LeftSquareBracket)) {
                this->context->isBindingElement = false;
                this->context->isAssignmentTarget = true;
                this->expect(LeftSquareBracket);
                Node* property = this->isolateCoverGrammar(&Parser::parseExpression);
                this->expect(RightSquareBracket);
                expr = this->finalize(this->startNode(startToken), new MemberExpressionNode(expr, property, false));

            } else if (this->lookahead->type == Token::TemplateToken && this->lookahead->head) {
                Node* quasi = this->parseTemplateLiteral();
                // expr = this->finalize(this->startNode(startToken), new Node.TaggedTemplateExpression(expr, quasi));
                RELEASE_ASSERT_NOT_REACHED();
            } else {
                break;
            }
        }
        this->context->allowIn = previousAllowIn;

        return expr;
    }

    Node* parseSuper()
    {
        MetaNode node = this->createNode();

        this->expectKeyword(Super);
        if (!this->match(LeftSquareBracket) && !this->match(Period)) {
            this->throwUnexpectedToken(this->lookahead);
        }

        this->throwError("super keyword is not supported yet");
        RELEASE_ASSERT_NOT_REACHED();
        // return this->finalize(node, new Node.Super());
        return nullptr;
    }

    Node* parseLeftHandSideExpression()
    {
        // assert(this->context->allowIn, 'callee of new expression always allow in keyword.');
        ASSERT(this->context->allowIn);

        MetaNode node = this->startNode(this->lookahead);
        Node* expr = (this->matchKeyword(Super) && this->context->inFunctionBody) ? this->parseSuper() : this->inheritCoverGrammar(this->matchKeyword(New) ? &Parser::parseNewExpression : &Parser::parsePrimaryExpression);

        while (true) {
            if (this->match(LeftSquareBracket)) {
                this->context->isBindingElement = false;
                this->context->isAssignmentTarget = true;
                this->expect(LeftSquareBracket);
                Node* property = this->isolateCoverGrammar(&Parser::parseExpression);
                this->expect(RightSquareBracket);
                expr = this->finalize(node, new MemberExpressionNode(expr, property, false));

            } else if (this->match(Period)) {
                this->context->isBindingElement = false;
                this->context->isAssignmentTarget = true;
                this->expect(Period);
                this->trackUsingNames = false;
                IdentifierNode* property = this->parseIdentifierName();
                this->trackUsingNames = true;
                expr = this->finalize(node, new MemberExpressionNode(expr, property, true));

            } else if (this->lookahead->type == Token::TemplateToken && this->lookahead->head) {
                Node* quasi = this->parseTemplateLiteral();
                // TODO
                // expr = this->finalize(node, new Node.TaggedTemplateExpression(expr, quasi));
                this->throwError("Tagged template expression is not supported yet");
                RELEASE_ASSERT_NOT_REACHED();
            } else {
                break;
            }
        }

        return expr;
    }

    // ECMA-262 12.4 Update Expressions

    Node* parseUpdateExpression()
    {
        Node* expr;
        RefPtr<ScannerResult> startToken = this->lookahead;

        if (this->match(PlusPlus) || this->match(MinusMinus)) {
            bool isPlus = this->match(PlusPlus);
            MetaNode node = this->startNode(startToken);
            RefPtr<ScannerResult> token = this->nextToken();
            expr = this->inheritCoverGrammar(&Parser::parseUnaryExpression);
            if (expr->isLiteral() || expr->type() == ASTNodeType::ThisExpression) {
                this->throwError(Messages::InvalidLHSInAssignment, String::emptyString, String::emptyString, ErrorObject::ReferenceError);
            }
            if (this->context->strict && expr->type() == Identifier && this->scanner->isRestrictedWord(((IdentifierNode*)expr)->name())) {
                this->tolerateError(Messages::StrictLHSPrefix);
            }
            if (!this->context->isAssignmentTarget && this->context->strict) {
                this->tolerateError(Messages::InvalidLHSInAssignment);
            }
            bool prefix = true;

            if (isPlus) {
                expr = this->finalize(node, new UpdateExpressionIncrementPrefixNode(expr));
            } else {
                expr = this->finalize(node, new UpdateExpressionDecrementPrefixNode(expr));
            }
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
        } else {
            expr = this->inheritCoverGrammar(&Parser::parseLeftHandSideExpressionAllowCall);
            if (!this->hasLineTerminator && this->lookahead->type == Token::PunctuatorToken) {
                if (this->match(PlusPlus) || this->match(MinusMinus)) {
                    bool isPlus = this->match(PlusPlus);
                    if (this->context->strict && expr->isIdentifier() && this->scanner->isRestrictedWord(((IdentifierNode*)expr)->name())) {
                        this->tolerateError(Messages::StrictLHSPostfix);
                    }
                    if (!this->context->isAssignmentTarget && this->context->strict) {
                        this->tolerateError(Messages::InvalidLHSInAssignment);
                    }
                    this->context->isAssignmentTarget = false;
                    this->context->isBindingElement = false;
                    this->nextToken();

                    if (expr->isLiteral() || expr->type() == ASTNodeType::ThisExpression) {
                        this->throwError(Messages::InvalidLHSInAssignment, String::emptyString, String::emptyString, ErrorObject::ReferenceError);
                    }

                    if (isPlus) {
                        expr = this->finalize(this->startNode(startToken), new UpdateExpressionIncrementPostfixNode(expr));
                    } else {
                        expr = this->finalize(this->startNode(startToken), new UpdateExpressionDecrementPostfixNode(expr));
                    }
                }
            }
        }

        return expr;
    }

    // ECMA-262 12.5 Unary Operators

    Node* parseUnaryExpression()
    {
        Node* expr;

        if (this->match(Plus)) {
            MetaNode node = this->startNode(this->lookahead);
            RefPtr<ScannerResult> token = this->nextToken();
            expr = this->inheritCoverGrammar(&Parser::parseUnaryExpression);
            expr = this->finalize(node, new UnaryExpressionPlusNode(expr));
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
        } else if (this->match(Minus)) {
            MetaNode node = this->startNode(this->lookahead);
            RefPtr<ScannerResult> token = this->nextToken();
            expr = this->inheritCoverGrammar(&Parser::parseUnaryExpression);
            expr = this->finalize(node, new UnaryExpressionMinusNode(expr));
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
        } else if (this->match(Wave)) {
            MetaNode node = this->startNode(this->lookahead);
            RefPtr<ScannerResult> token = this->nextToken();
            expr = this->inheritCoverGrammar(&Parser::parseUnaryExpression);
            expr = this->finalize(node, new UnaryExpressionBitwiseNotNode(expr));
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
        } else if (this->match(ExclamationMark)) {
            MetaNode node = this->startNode(this->lookahead);
            RefPtr<ScannerResult> token = this->nextToken();
            expr = this->inheritCoverGrammar(&Parser::parseUnaryExpression);
            expr = this->finalize(node, new UnaryExpressionLogicalNotNode(expr));
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
        } else if (this->matchKeyword(Delete)) {
            MetaNode node = this->startNode(this->lookahead);
            RefPtr<ScannerResult> token = this->nextToken();
            expr = this->inheritCoverGrammar(&Parser::parseUnaryExpression);
            Node* exprOld = expr;
            expr = this->finalize(node, new UnaryExpressionDeleteNode(expr));
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;

            if (this->context->strict && exprOld->isIdentifier()) {
                this->tolerateError(Messages::StrictDelete);
            }
            if (exprOld->isIdentifier()) {
                this->scopeContexts.back()->m_hasEvaluateBindingId = true;
            }
        } else if (this->matchKeyword(Void)) {
            MetaNode node = this->startNode(this->lookahead);
            RefPtr<ScannerResult> token = this->nextToken();
            expr = this->inheritCoverGrammar(&Parser::parseUnaryExpression);
            expr = this->finalize(node, new UnaryExpressionVoidNode(expr));
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
        } else if (this->matchKeyword(Typeof)) {
            MetaNode node = this->startNode(this->lookahead);
            RefPtr<ScannerResult> token = this->nextToken();
            expr = this->inheritCoverGrammar(&Parser::parseUnaryExpression);
            Node* exprOld = expr;
            expr = this->finalize(node, new UnaryExpressionTypeOfNode(expr));
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;

            if (exprOld->isIdentifier()) {
                AtomicString s = exprOld->asIdentifier()->name();
                if (!this->scopeContexts.back()->hasName(s)) {
                    this->scopeContexts.back()->m_hasEvaluateBindingId = true;
                }
            }
        } else {
            expr = this->parseUpdateExpression();
        }

        return expr;
    }

    Node* parseExponentiationExpression()
    {
        RefPtr<ScannerResult> startToken = this->lookahead;
        Node* expr = this->inheritCoverGrammar(&Parser::parseUnaryExpression);
        // TODO
        /*
         if (expr->type != Syntax.UnaryExpression && this->match('**')) {
             this->nextToken();
             this->context->isAssignmentTarget = false;
             this->context->isBindingElement = false;
             const left = expr;
             const right = this->isolateCoverGrammar(this->parseExponentiationExpression);
             expr = this->finalize(this->startNode(startToken), new Node.BinaryExpression('**', left, right));
         }*/

        return expr;
    }

    // ECMA-262 12.6 Exponentiation Operators
    // ECMA-262 12.7 Multiplicative Operators
    // ECMA-262 12.8 Additive Operators
    // ECMA-262 12.9 Bitwise Shift Operators
    // ECMA-262 12.10 Relational Operators
    // ECMA-262 12.11 Equality Operators
    // ECMA-262 12.12 Binary Bitwise Operators
    // ECMA-262 12.13 Binary Logical Operators

    int binaryPrecedence(RefPtr<ScannerResult> token)
    {
        if (token->type == Token::PunctuatorToken) {
            if (token->valuePunctuatorsKind == Substitution) {
                return 0;
            } else if (token->valuePunctuatorsKind == LogicalOr) {
                return 1;
            } else if (token->valuePunctuatorsKind == LogicalAnd) {
                return 2;
            } else if (token->valuePunctuatorsKind == BitwiseOr) {
                return 3;
            } else if (token->valuePunctuatorsKind == BitwiseXor) {
                return 4;
            } else if (token->valuePunctuatorsKind == BitwiseAnd) {
                return 5;
            } else if (token->valuePunctuatorsKind == Equal) {
                return 6;
            } else if (token->valuePunctuatorsKind == NotEqual) {
                return 6;
            } else if (token->valuePunctuatorsKind == StrictEqual) {
                return 6;
            } else if (token->valuePunctuatorsKind == NotStrictEqual) {
                return 6;
            } else if (token->valuePunctuatorsKind == RightInequality) {
                return 7;
            } else if (token->valuePunctuatorsKind == LeftInequality) {
                return 7;
            } else if (token->valuePunctuatorsKind == RightInequalityEqual) {
                return 7;
            } else if (token->valuePunctuatorsKind == LeftInequalityEqual) {
                return 7;
            } else if (token->valuePunctuatorsKind == LeftShift) {
                return 8;
            } else if (token->valuePunctuatorsKind == RightShift) {
                return 8;
            } else if (token->valuePunctuatorsKind == UnsignedRightShift) {
                return 8;
            } else if (token->valuePunctuatorsKind == Plus) {
                return 9;
            } else if (token->valuePunctuatorsKind == Minus) {
                return 9;
            } else if (token->valuePunctuatorsKind == Multiply) {
                return 11;
            } else if (token->valuePunctuatorsKind == Divide) {
                return 11;
            } else if (token->valuePunctuatorsKind == Mod) {
                return 11;
            }
            return 0;
        } else if (token->type == Token::KeywordToken) {
            if (token->valueKeywordKind == In) {
                return this->context->allowIn ? 7 : 0;
            } else if (token->valueKeywordKind == InstanceofKeyword) {
                return 7;
            }
        } else {
            return 0;
        }
        return 0;
    }

    Node* parseBinaryExpression()
    {
        RefPtr<ScannerResult> startToken = this->lookahead;

        Node* expr = this->inheritCoverGrammar(&Parser::parseExponentiationExpression);

        RefPtr<ScannerResult> token = this->lookahead;
        std::vector<RefPtr<ScannerResult>, GCUtil::gc_malloc_ignore_off_page_allocator<RefPtr<ScannerResult>>> tokenKeeper;
        int prec = this->binaryPrecedence(token);
        if (prec > 0) {
            this->nextToken();

            token->prec = prec;
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;

            std::vector<RefPtr<ScannerResult>, GCUtil::gc_malloc_ignore_off_page_allocator<RefPtr<ScannerResult>>> markers;
            markers.push_back(startToken);
            markers.push_back(this->lookahead);
            Node* left = expr;
            Node* right = this->isolateCoverGrammar(&Parser::parseExponentiationExpression);

            std::vector<void*, GCUtil::gc_malloc_ignore_off_page_allocator<void*>> stack;
            stack.push_back(left);
            tokenKeeper.push_back(token);
            stack.push_back(token.get());
            stack.push_back(right);

            while (true) {
                prec = this->binaryPrecedence(this->lookahead);
                if (prec <= 0) {
                    break;
                }

                // Reduce: make a binary expression from the three topmost entries.
                while ((stack.size() > 2) && (prec <= ((ScannerResult*)stack[stack.size() - 2])->prec)) {
                    right = (Node*)stack.back();
                    stack.pop_back();
                    ScannerResult* operator_ = (ScannerResult*)stack.back();
                    stack.pop_back();
                    left = (Node*)stack.back();
                    stack.pop_back();
                    markers.pop_back();
                    MetaNode node = this->startNode(markers.back());
                    stack.push_back(this->finalize(node, finishBinaryExpression(left, right, operator_)));
                }

                // Shift.
                token = this->nextToken();
                token->prec = prec;
                tokenKeeper.push_back(token);
                stack.push_back(token.get());
                markers.push_back(this->lookahead);
                stack.push_back(this->isolateCoverGrammar(&Parser::parseExponentiationExpression));
            }

            // Final reduce to clean-up the stack.
            size_t i = stack.size() - 1;
            expr = (Node*)stack[i];
            markers.pop_back();
            while (i > 1) {
                MetaNode node = this->startNode(markers.back());
                expr = this->finalize(node, finishBinaryExpression((Node*)stack[i - 2], expr, ((ScannerResult*)stack[i - 1])));
                i -= 2;
            }
        }

        return expr;
    }

    Node* finishBinaryExpression(Node* left, Node* right, ScannerResult* token)
    {
        Node* nd;
        if (token->type == Token::PunctuatorToken) {
            PunctuatorsKind oper = token->valuePunctuatorsKind;
            // Additive Operators
            if (oper == Plus)
                nd = new BinaryExpressionPlusNode(left, right);
            else if (oper == Minus)
                nd = new BinaryExpressionMinusNode(left, right);

            // Bitwise Shift Operators
            else if (oper == LeftShift)
                nd = new BinaryExpressionLeftShiftNode(left, right);
            else if (oper == RightShift)
                nd = new BinaryExpressionSignedRightShiftNode(left, right);
            else if (oper == UnsignedRightShift)
                nd = new BinaryExpressionUnsignedRightShiftNode(left, right);

            // Multiplicative Operators
            else if (oper == Multiply)
                nd = new BinaryExpressionMultiplyNode(left, right);
            else if (oper == Divide)
                nd = new BinaryExpressionDivisionNode(left, right);
            else if (oper == Mod)
                nd = new BinaryExpressionModNode(left, right);

            // Relational Operators
            else if (oper == LeftInequality)
                nd = new BinaryExpressionLessThanNode(left, right);
            else if (oper == RightInequality)
                nd = new BinaryExpressionGreaterThanNode(left, right);
            else if (oper == LeftInequalityEqual)
                nd = new BinaryExpressionLessThanOrEqualNode(left, right);
            else if (oper == RightInequalityEqual)
                nd = new BinaryExpressionGreaterThanOrEqualNode(left, right);

            // Equality Operators
            else if (oper == Equal)
                nd = new BinaryExpressionEqualNode(left, right);
            else if (oper == NotEqual)
                nd = new BinaryExpressionNotEqualNode(left, right);
            else if (oper == StrictEqual)
                nd = new BinaryExpressionStrictEqualNode(left, right);
            else if (oper == NotStrictEqual)
                nd = new BinaryExpressionNotStrictEqualNode(left, right);

            // Binary Bitwise Operator
            else if (oper == BitwiseAnd)
                nd = new BinaryExpressionBitwiseAndNode(left, right);
            else if (oper == BitwiseXor)
                nd = new BinaryExpressionBitwiseXorNode(left, right);
            else if (oper == BitwiseOr)
                nd = new BinaryExpressionBitwiseOrNode(left, right);
            else if (oper == LogicalOr)
                nd = new BinaryExpressionLogicalOrNode(left, right);
            else if (oper == LogicalAnd)
                nd = new BinaryExpressionLogicalAndNode(left, right);
            else
                RELEASE_ASSERT_NOT_REACHED();
        } else {
            if (token->valueKeywordKind == KeywordKind::In)
                nd = new BinaryExpressionInNode(left, right);
            else if (token->valueKeywordKind == KeywordKind::InstanceofKeyword)
                nd = new BinaryExpressionInstanceOfNode(left, right);
            else
                RELEASE_ASSERT_NOT_REACHED();
        }
        return nd;
    }

    // ECMA-262 12.14 Conditional Operator

    Node* parseConditionalExpression()
    {
        RefPtr<ScannerResult> startToken = this->lookahead;

        Node* expr = this->inheritCoverGrammar(&Parser::parseBinaryExpression);
        if (this->match(GuessMark)) {
            this->nextToken();

            bool previousAllowIn = this->context->allowIn;
            this->context->allowIn = true;
            Node* consequent = this->isolateCoverGrammar(&Parser::parseAssignmentExpression);
            this->context->allowIn = previousAllowIn;

            this->expect(Colon);
            Node* alternate = this->isolateCoverGrammar(&Parser::parseAssignmentExpression);

            expr = this->finalize(this->startNode(startToken), new ConditionalExpressionNode(expr, consequent, alternate));
            this->context->isAssignmentTarget = false;
            this->context->isBindingElement = false;
        }

        return expr;
    }

    // ECMA-262 12.15 Assignment Operators
    /*
    void checkPatternParam(ParseParameterOptions options, Node* param)
    {
        switch (param->type()) {
        case Identifier:
            this->validateParam(options, nodeExtraInfo.find(((IdentifierNode*)param))->second, ((IdentifierNode*)param)->name());
            break;
        case RestElement:
            this->checkPatternParam(options, ((RestElementNode*)param)->argument());
            break;
        // case AssignmentPattern:
        case AssignmentExpression:
        case AssignmentExpressionBitwiseAnd:
        case AssignmentExpressionBitwiseOr:
        case AssignmentExpressionBitwiseXor:
        case AssignmentExpressionDivision:
        case AssignmentExpressionLeftShift:
        case AssignmentExpressionMinus:
        case AssignmentExpressionMod:
        case AssignmentExpressionMultiply:
        case AssignmentExpressionPlus:
        case AssignmentExpressionSignedRightShift:
        case AssignmentExpressionUnsignedRightShift:
        case AssignmentExpressionSimple:
            this->checkPatternParam(options, ((AssignmentExpressionSimpleNode*)param)->left());
            break;
        default:
            RELEASE_ASSERT_NOT_REACHED();
             case Syntax.ArrayPattern:
                 for (let i = 0; i < param.elements.length; i++) {
                     if (param.elements[i] !== null) {
                         this->checkPatternParam(options, param.elements[i]);
                     }
                 }
                 break;
             case Syntax.YieldExpression:
                 break;
             default:
                 RELEASE_ASSERT(param->type() == Object)
                 assert(param.type === Syntax.ObjectPattern, 'Invalid type');
                 for (let i = 0; i < param.properties.length; i++) {
                     this->checkPatternParam(options, param.properties[i].value);
                 }
                 break;
        }
    }
    */
    /*
     reinterpretAsCoverFormalsList(expr) {
         let params = [expr];
         let options;

         switch (expr.type) {
             case Syntax.Identifier:
                 break;
             case ArrowParameterPlaceHolder:
                 params = expr.params;
                 break;
             default:
                 return null;
         }

         options = {
             paramSet: {}
         };

         for (let i = 0; i < params.length; ++i) {
             const param = params[i];
             if (param.type === Syntax.AssignmentPattern) {
                 if (param.right.type === Syntax.YieldExpression) {
                     if (param.right.argument) {
                         this->throwUnexpectedToken(this->lookahead);
                     }
                     param.right.type = Syntax.Identifier;
                     param.right.name = 'yield';
                     delete param.right.argument;
                     delete param.right.delegate;
                 }
             }
             this->checkPatternParam(options, param);
             params[i] = param;
         }

         if (this->context.strict || !this->context.allowYield) {
             for (let i = 0; i < params.length; ++i) {
                 const param = params[i];
                 if (param.type === Syntax.YieldExpression) {
                     this->throwUnexpectedToken(this->lookahead);
                 }
             }
         }

         if (options.message === Messages.StrictParamDupe) {
             const token = this->context.strict ? options.stricted : options.firstRestricted;
             this->throwUnexpectedToken(token, options.message);
         }

         return {
             params: params,
             stricted: options.stricted,
             firstRestricted: options.firstRestricted,
             message: options.message
         };
     }
*/
    Node* parseAssignmentExpression()
    {
        Node* expr;

        if (!this->context->allowYield && this->matchKeyword(Yield)) {
            expr = this->parseYieldExpression();
        } else {
            RefPtr<ScannerResult> startToken = this->lookahead;
            RefPtr<ScannerResult> token = startToken;
            expr = this->parseConditionalExpression();
            /*
             if (expr->type() == ArrowParameterPlaceHolder || this->match('=>')) {
                 RELEASE_ASSERT_NOT_REACHED();
                 // ECMA-262 14.2 Arrow Function Definitions
                 this->context->isAssignmentTarget = false;
                 this->context->isBindingElement = false;
                 const list = this->reinterpretAsCoverFormalsList(expr);

                 if (list) {
                     if (this->hasLineTerminator) {
                         this->tolerateUnexpectedToken(this->lookahead);
                     }
                     this->context->firstCoverInitializedNameError = null;

                     const previousStrict = this->context->strict;
                     const previousAllowYield = this->context->allowYield;
                     this->context->allowYield = true;

                     const node = this->startNode(startToken);
                     this->expect('=>');
                     const body = this->match('{') ? this->parseFunctionSourceElements() :
                         this->isolateCoverGrammar(this->parseAssignmentExpression);
                     const expression = body.type !== Syntax.BlockStatement;

                     if (this->context->strict && list.firstRestricted) {
                         this->throwUnexpectedToken(list.firstRestricted, list.message);
                     }
                     if (this->context->strict && list.stricted) {
                         this->tolerateUnexpectedToken(list.stricted, list.message);
                     }
                     expr = this->finalize(node, new Node.ArrowFunctionExpression(list.params, body, expression));

                     this->context->strict = previousStrict;
                     this->context->allowYield = previousAllowYield;
                 }

             } else {
                 if (this->matchAssign()) {
                     if (!this->context->isAssignmentTarget) {
                         this->tolerateError(Messages.InvalidLHSInAssignment);
                     }

                     if (this->context->strict && expr.type === Syntax.Identifier) {
                         const id = <Node.Identifier>(expr);
                         if (this->scanner.isRestrictedWord(id.name)) {
                             this->tolerateUnexpectedToken(token, Messages.StrictLHSAssignment);
                         }
                         if (this->scanner.isStrictModeReservedWord(id.name)) {
                             this->tolerateUnexpectedToken(token, Messages.StrictReservedWord);
                         }
                     }

                     if (!this->match('=')) {
                         this->context->isAssignmentTarget = false;
                         this->context->isBindingElement = false;
                     } else {
                         this->reinterpretExpressionAsPattern(expr);
                     }

                     token = this->nextToken();
                     const right = this->isolateCoverGrammar(this->parseAssignmentExpression);
                     expr = this->finalize(this->startNode(startToken), new Node.AssignmentExpression(token.value, expr, right));
                     this->context->firstCoverInitializedNameError = null;
                 }
             }*/
            if (this->matchAssign()) {
                if (!this->context->isAssignmentTarget && this->context->strict) {
                    this->tolerateError(Messages::InvalidLHSInAssignment, String::emptyString, String::emptyString, ErrorObject::ReferenceError);
                }

                if (this->context->strict && expr->type() == Identifier) {
                    IdentifierNode* id = (IdentifierNode*)(expr);
                    if (this->scanner->isRestrictedWord(id->name())) {
                        this->tolerateUnexpectedToken(token, Messages::StrictLHSAssignment);
                    }
                    if (this->scanner->isStrictModeReservedWord(id->name())) {
                        this->tolerateUnexpectedToken(token, Messages::StrictReservedWord);
                    }
                }

                if (!this->match(Substitution)) {
                    this->context->isAssignmentTarget = false;
                    this->context->isBindingElement = false;
                } else {
                    this->reinterpretExpressionAsPattern(expr);
                }

                if (expr->isLiteral() || expr->type() == ASTNodeType::ThisExpression) {
                    this->throwError(Messages::InvalidLHSInAssignment, String::emptyString, String::emptyString, ErrorObject::ReferenceError);
                }

                token = this->nextToken();
                Node* right = this->isolateCoverGrammar(&Parser::parseAssignmentExpression);
                if (token->valuePunctuatorsKind == Substitution) {
                    expr = new AssignmentExpressionSimpleNode(expr, right);
                } else if (token->valuePunctuatorsKind == PlusEqual) {
                    expr = new AssignmentExpressionPlusNode(expr, right);
                } else if (token->valuePunctuatorsKind == MinusEqual) {
                    expr = new AssignmentExpressionMinusNode(expr, right);
                } else if (token->valuePunctuatorsKind == MultiplyEqual) {
                    expr = new AssignmentExpressionMultiplyNode(expr, right);
                } else if (token->valuePunctuatorsKind == DivideEqual) {
                    expr = new AssignmentExpressionDivisionNode(expr, right);
                } else if (token->valuePunctuatorsKind == ModEqual) {
                    expr = new AssignmentExpressionModNode(expr, right);
                } else if (token->valuePunctuatorsKind == LeftShiftEqual) {
                    expr = new AssignmentExpressionLeftShiftNode(expr, right);
                } else if (token->valuePunctuatorsKind == RightShiftEqual) {
                    expr = new AssignmentExpressionSignedRightShiftNode(expr, right);
                } else if (token->valuePunctuatorsKind == UnsignedRightShiftEqual) {
                    expr = new AssignmentExpressionUnsignedShiftNode(expr, right);
                } else if (token->valuePunctuatorsKind == BitwiseXorEqual) {
                    expr = new AssignmentExpressionBitwiseXorNode(expr, right);
                } else if (token->valuePunctuatorsKind == BitwiseAndEqual) {
                    expr = new AssignmentExpressionBitwiseAndNode(expr, right);
                } else if (token->valuePunctuatorsKind == BitwiseOrEqual) {
                    expr = new AssignmentExpressionBitwiseOrNode(expr, right);
                } else {
                    RELEASE_ASSERT_NOT_REACHED();
                }
                expr = this->finalize(this->startNode(startToken), expr);
                this->context->firstCoverInitializedNameError = nullptr;
            }
        }

        return expr;
    }

    // ECMA-262 12.16 Comma Operator

    Node* parseExpression()
    {
        RefPtr<ScannerResult> startToken = this->lookahead;
        Node* expr = this->isolateCoverGrammar(&Parser::parseAssignmentExpression);

        if (this->match(Comma)) {
            ExpressionNodeVector expressions;
            expressions.push_back(expr);
            while (this->startMarker.index < this->scanner->length) {
                if (!this->match(Comma)) {
                    break;
                }
                this->nextToken();
                expressions.push_back(this->isolateCoverGrammar(&Parser::parseAssignmentExpression));
            }

            expr = this->finalize(this->startNode(startToken), new SequenceExpressionNode(std::move(expressions)));
        }

        return expr;
    }

    // ECMA-262 13.2 Block

    StatementNode* parseStatementListItem()
    {
        StatementNode* statement = nullptr;
        this->context->isAssignmentTarget = true;
        this->context->isBindingElement = true;
        if (this->lookahead->type == KeywordToken) {
            switch (this->lookahead->valueKeywordKind) {
            case Function:
                statement = this->parseFunctionDeclaration();
                break;
            default:
                statement = this->parseStatement();
                break;
            }
        } else {
            statement = this->parseStatement();
        }
        /*
         if (this->lookahead.type === Token.Keyword) {
             switch (this->lookahead.value) {
                 case 'export':
                     if (this->sourceType !== 'module') {
                         this->tolerateUnexpectedToken(this->lookahead, Messages.IllegalExportDeclaration);
                     }
                     statement = this->parseExportDeclaration();
                     break;
                 case 'import':
                     if (this->sourceType !== 'module') {
                         this->tolerateUnexpectedToken(this->lookahead, Messages.IllegalImportDeclaration);
                     }
                     statement = this->parseImportDeclaration();
                     break;
                 case 'const':
                     statement = this->parseLexicalDeclaration({ inFor: false });
                     break;
                 case 'function':
                     statement = this->parseFunctionDeclaration();
                     break;
                 case 'class':
                     statement = this->parseClassDeclaration();
                     break;
                 case 'let':
                     statement = this->isLexicalDeclaration() ? this->parseLexicalDeclaration({ inFor: false }) : this->parseStatement();
                     break;
                 default:
                     statement = this->parseStatement();
                     break;
             }
         } else {
             statement = this->parseStatement();
         }*/

        return statement;
    }

    BlockStatementNode* parseBlock()
    {
        MetaNode node = this->createNode();

        this->expect(LeftBrace);
        StatementNodeVector block;
        while (true) {
            if (this->match(RightBrace)) {
                break;
            }
            block.push_back(this->parseStatementListItem());
        }
        this->expect(RightBrace);

        return this->finalize(node, new BlockStatementNode(std::move(block)));
    }
    /*
         // ECMA-262 13.3.1 Let and Const Declarations

    parseLexicalBinding(kind: string, options): Node.VariableDeclarator {
        const node = this->createNode();
        let params = [];
        const id = this->parsePattern(params, kind);

        // ECMA-262 12.2.1
        if (this->context.strict && id.type === Syntax.Identifier) {
            if (this->scanner.isRestrictedWord((<Node.Identifier>(id)).name)) {
                this->tolerateError(Messages.StrictVarName);
            }
        }

        let init = null;
        if (kind === 'const') {
            if (!this->matchKeyword('in') && !this->matchContextualKeyword('of')) {
                this->expect('=');
                init = this->isolateCoverGrammar(this->parseAssignmentExpression);
            }
        } else if ((!options.inFor && id.type !== Syntax.Identifier) || this->match('=')) {
            this->expect('=');
            init = this->isolateCoverGrammar(this->parseAssignmentExpression);
        }

        return this->finalize(node, new Node.VariableDeclarator(id, init));
    }

    parseBindingList(kind: string, options): Node.VariableDeclarator[] {
        let list = [this->parseLexicalBinding(kind, options)];

        while (this->match(',')) {
            this->nextToken();
            list.push(this->parseLexicalBinding(kind, options));
        }

        return list;
    }

    isLexicalDeclaration(): boolean {
        const previousIndex = this->scanner.index;
        const previousLineNumber = this->scanner.lineNumber;
        const previousLineStart = this->scanner.lineStart;
        this->collectComments();
        const next = <any>this->scanner.lex();
        this->scanner.index = previousIndex;
        this->scanner.lineNumber = previousLineNumber;
        this->scanner.lineStart = previousLineStart;

        return (next.type === Token.Identifier) ||
            (next.type === Token.Punctuator && next.value === '[') ||
            (next.type === Token.Punctuator && next.value === '{') ||
            (next.type === Token.Keyword && next.value === 'let') ||
            (next.type === Token.Keyword && next.value === 'yield');
    }

    parseLexicalDeclaration(options): Node.VariableDeclaration {
        const node = this->createNode();
        const kind = this->nextToken().value;
        assert(kind === 'let' || kind === 'const', 'Lexical declaration must be either let or const');

        const declarations = this->parseBindingList(kind, options);
        this->consumeSemicolon();

        return this->finalize(node, new Node.VariableDeclaration(declarations, kind));
    }

    // ECMA-262 13.3.3 Destructuring Binding Patterns

    parseBindingRestElement(params, kind: string): Node.RestElement {
        const node = this->createNode();
        this->expect('...');
        params.push(this->lookahead);
        const arg = this->parseVariableIdentifier(kind);
        return this->finalize(node, new Node.RestElement(arg));
    }


    parseArrayPattern(params, kind: string): Node.ArrayPattern {
        const node = this->createNode();

        this->expect('[');
        const elements: Node.ArrayPatternElement[] = [];
        while (!this->match(']')) {
            if (this->match(',')) {
                this->nextToken();
                elements.push(null);
            } else {
                if (this->match('...')) {
                    elements.push(this->parseBindingRestElement(params, kind));
                    break;
                } else {
                    elements.push(this->parsePatternWithDefault(params, kind));
                }
                if (!this->match(']')) {
                    this->expect(',');
                }
            }

        }
        this->expect(']');

        return this->finalize(node, new Node.ArrayPattern(elements));
    }

    parsePropertyPattern(params, kind: string): Node.Property {
        const node = this->createNode();

        let computed = false;
        let shorthand = false;
        const method = false;

        let key: Node.PropertyKey;
        let value: Node.PropertyValue;

        if (this->lookahead.type === Token.Identifier) {
            const keyToken = this->lookahead;
            key = this->parseVariableIdentifier();
            const init = this->finalize(node, new Node.Identifier(keyToken.value));
            if (this->match('=')) {
                params.push(keyToken);
                shorthand = true;
                this->nextToken();
                const expr = this->parseAssignmentExpression();
                value = this->finalize(this->startNode(keyToken), new Node.AssignmentPattern(init, expr));
            } else if (!this->match(':')) {
                params.push(keyToken);
                shorthand = true;
                value = init;
            } else {
                this->expect(':');
                value = this->parsePatternWithDefault(params, kind);
            }
        } else {
            computed = this->match('[');
            key = this->parseObjectPropertyKey();
            this->expect(':');
            value = this->parsePatternWithDefault(params, kind);
        }

        return this->finalize(node, new Node.Property('init', key, computed, value, method, shorthand));
    }

    parseObjectPattern(params, kind: string): Node.ObjectPattern {
        const node = this->createNode();
        const properties: Node.Property[] = [];

        this->expect('{');
        while (!this->match('}')) {
            properties.push(this->parsePropertyPattern(params, kind));
            if (!this->match('}')) {
                this->expect(',');
            }
        }
        this->expect('}');

        return this->finalize(node, new Node.ObjectPattern(properties));
    }

    parsePattern(params, kind?: string): Node.BindingIdentifier | Node.BindingPattern {
        let pattern;

        if (this->match('[')) {
            pattern = this->parseArrayPattern(params, kind);
        } else if (this->match('{')) {
            pattern = this->parseObjectPattern(params, kind);
        } else {
            if (this->matchKeyword('let') && (kind === 'const' || kind === 'let')) {
                this->tolerateUnexpectedToken(this->lookahead, Messages.UnexpectedToken);
            }
            params.push(this->lookahead);
            pattern = this->parseVariableIdentifier(kind);
        }

        return pattern;
    }

    parsePatternWithDefault(params, kind?: string): Node.AssignmentPattern | Node.BindingIdentifier | Node.BindingPattern {
        const startToken = this->lookahead;

        let pattern = this->parsePattern(params, kind);
        if (this->match('=')) {
            this->nextToken();
            const previousAllowYield = this->context.allowYield;
            this->context.allowYield = true;
            const right = this->isolateCoverGrammar(this->parseAssignmentExpression);
            this->context.allowYield = previousAllowYield;
            pattern = this->finalize(this->startNode(startToken), new Node.AssignmentPattern(pattern, right));
        }

        return pattern;
    }
    */

    // ECMA-262 13.3.2 Variable Statement
    IdentifierNode* parseVariableIdentifier(String* kind = String::emptyString)
    {
        MetaNode node = this->createNode();

        RefPtr<ScannerResult> token = this->nextToken();
        if (token->type == Token::KeywordToken && token->valueKeywordKind == Yield) {
            if (this->context->strict) {
                this->tolerateUnexpectedToken(token, Messages::StrictReservedWord);
            }
            if (!this->context->allowYield) {
                this->throwUnexpectedToken(token);
            }
        } else if (token->type != Token::IdentifierToken) {
            if (this->context->strict && token->type == Token::KeywordToken && this->scanner->isStrictModeReservedWord(token->valueString)) {
                this->tolerateUnexpectedToken(token, Messages::StrictReservedWord);
            } else {
                if (this->context->strict || token->valueString != "let" || (!kind->equals("var"))) {
                    this->throwUnexpectedToken(token);
                }
            }
        } else if (this->sourceType == Module && token->type == Token::IdentifierToken && token->valueString == "Await") {
            this->tolerateUnexpectedToken(token);
        }

        return this->finalize(node, finishIdentifier(token, true));
    }

    struct DeclarationOptions {
        bool inFor;
    };

    VariableDeclaratorNode* parseVariableDeclaration(DeclarationOptions& options)
    {
        MetaNode node = this->createNode();

        std::vector<RefPtr<ScannerResult>, GCUtil::gc_malloc_ignore_off_page_allocator<RefPtr<ScannerResult>>> params;
        Node* id = this->parsePattern(params, new ASCIIString("var"));

        // ECMA-262 12.2.1
        if (this->context->strict && id->type() == Identifier) {
            if (this->scanner->isRestrictedWord(((IdentifierNode*)id)->name())) {
                this->tolerateError(Messages::StrictVarName);
            }
        }

        if (id->type() == Identifier) {
            this->scopeContexts.back()->insertName(((IdentifierNode*)id)->name(), true);
        }

        Node* init = nullptr;
        if (this->match(Substitution)) {
            this->nextToken();
            init = this->isolateCoverGrammar(&Parser::parseAssignmentExpression);
        } else if (id->type() != Identifier && !options.inFor) {
            this->expect(Substitution);
        }

        return this->finalize(node, new VariableDeclaratorNode(id, init));
    }

    VariableDeclaratorVector parseVariableDeclarationList(DeclarationOptions& options)
    {
        DeclarationOptions opt;
        opt.inFor = options.inFor;

        VariableDeclaratorVector list;
        list.push_back(this->parseVariableDeclaration(opt));
        while (this->match(Comma)) {
            this->nextToken();
            list.push_back(this->parseVariableDeclaration(opt));
        }

        return list;
    }

    VariableDeclarationNode* parseVariableStatement()
    {
        MetaNode node = this->createNode();
        this->expectKeyword(Var);
        DeclarationOptions opt;
        opt.inFor = false;
        VariableDeclaratorVector declarations = this->parseVariableDeclarationList(opt);
        this->consumeSemicolon();

        return this->finalize(node, new VariableDeclarationNode(std::move(declarations) /*, 'var'*/));
    }

    // ECMA-262 13.4 Empty Statement

    EmptyStatementNode* parseEmptyStatement()
    {
        MetaNode node = this->createNode();
        this->expect(SemiColon);
        return this->finalize(node, new EmptyStatementNode());
    }

    // ECMA-262 13.5 Expression Statement

    ExpressionStatementNode* parseExpressionStatement()
    {
        MetaNode node = this->createNode();
        Node* expr = this->parseExpression();
        this->consumeSemicolon();
        return this->finalize(node, new ExpressionStatementNode(expr));
    }

    // ECMA-262 13.6 If statement

    IfStatementNode* parseIfStatement()
    {
        MetaNode node = this->createNode();
        Node* consequent = nullptr;
        Node* alternate = nullptr;

        this->expectKeyword(If);
        this->expect(LeftParenthesis);
        Node* test = this->parseExpression();

        if (!this->match(RightParenthesis) && this->config.tolerant) {
            this->tolerateUnexpectedToken(this->nextToken());
            consequent = this->finalize(this->createNode(), new EmptyStatementNode());
        } else {
            this->expect(RightParenthesis);
            consequent = this->parseStatement(this->context->strict ? false : true);
            if (this->matchKeyword(Else)) {
                this->nextToken();
                alternate = this->parseStatement();
            }
        }

        return this->finalize(node, new IfStatementNode(test, consequent, alternate));
    }

    // ECMA-262 13.7.2 The do-while Statement

    DoWhileStatementNode* parseDoWhileStatement()
    {
        MetaNode node = this->createNode();
        this->expectKeyword(Do);

        bool previousInIteration = this->context->inIteration;
        this->context->inIteration = true;
        Node* body = this->parseStatement(false);
        this->context->inIteration = previousInIteration;

        this->expectKeyword(While);
        this->expect(LeftParenthesis);
        Node* test = this->parseExpression();
        this->expect(RightParenthesis);
        if (this->match(SemiColon)) {
            this->nextToken();
        }

        return this->finalize(node, new DoWhileStatementNode(test, body));
    }

    // ECMA-262 13.7.3 The while Statement

    WhileStatementNode* parseWhileStatement()
    {
        MetaNode node = this->createNode();
        Node* body;

        bool prevInLoop = this->context->inLoop;
        this->context->inLoop = true;

        this->expectKeyword(While);
        this->expect(LeftParenthesis);
        Node* test = this->parseExpression();

        if (!this->match(RightParenthesis) && this->config.tolerant) {
            this->tolerateUnexpectedToken(this->nextToken());
            body = this->finalize(this->createNode(), new EmptyStatementNode());
        } else {
            this->expect(RightParenthesis);

            bool previousInIteration = this->context->inIteration;
            this->context->inIteration = true;
            body = this->parseStatement(false);
            this->context->inIteration = previousInIteration;
        }

        this->context->inLoop = prevInLoop;

        return this->finalize(node, new WhileStatementNode(test, body));
    }

    // ECMA-262 13.7.4 The for Statement
    // ECMA-262 13.7.5 The for-in and for-of Statements

    StatementNode* parseForStatement()
    {
        Node* init = nullptr;
        Node* test = nullptr;
        Node* update = nullptr;
        bool forIn = true;
        Node* left = nullptr;
        Node* right = nullptr;

        bool prevInLoop = this->context->inLoop;

        MetaNode node = this->createNode();
        this->expectKeyword(For);
        this->expect(LeftParenthesis);

        if (this->match(SemiColon)) {
            this->nextToken();
        } else {
            if (this->matchKeyword(Var)) {
                MetaNode metaInit = this->createNode();
                this->nextToken();

                bool previousAllowIn = this->context->allowIn;
                this->context->allowIn = false;
                DeclarationOptions opt;
                opt.inFor = true;
                VariableDeclaratorVector declarations = this->parseVariableDeclarationList(opt);
                this->context->allowIn = previousAllowIn;

                if (declarations.size() == 1 && this->matchKeyword(In)) {
                    VariableDeclaratorNode* decl = declarations[0];
                    // if (decl->init() && (decl.id.type === Syntax.ArrayPattern || decl.id.type === Syntax.ObjectPattern || this->context->strict)) {
                    if (decl->init() && (decl->id()->type() == ArrayExpression || decl->id()->type() == ObjectExpression || this->context->strict)) {
                        this->tolerateError(Messages::ForInOfLoopInitializer, new ASCIIString("for-in"));
                    }
                    init = this->finalize(metaInit, new VariableDeclarationNode(std::move(declarations) /*, 'var'*/));
                    this->nextToken();
                    left = init;
                    right = this->parseExpression();
                    init = nullptr;
                } else if (declarations.size() == 1 && declarations[0]->init() == nullptr
                           && this->lookahead->type == Token::IdentifierToken && this->lookahead->valueString == "of") {
                    init = this->finalize(metaInit, new VariableDeclarationNode(std::move(declarations) /*, 'var'*/));
                    this->nextToken();
                    left = init;
                    right = this->parseAssignmentExpression();
                    init = nullptr;
                    forIn = false;
                } else {
                    init = this->finalize(metaInit, new VariableDeclarationNode(std::move(declarations) /*, 'var'*/));
                    this->expect(SemiColon);
                }
            } else if (this->matchKeyword(Const) || this->matchKeyword(Let)) {
                // TODO
                this->throwUnexpectedToken(this->nextToken());
                /*
                init = this->createNode();
                const kind = this->nextToken().value;

                if (!this->context->strict && this->lookahead.value === 'in') {
                    init = this->finalize(init, new Node.Identifier(kind));
                    this->nextToken();
                    left = init;
                    right = this->parseExpression();
                    init = null;
                } else {
                    const previousAllowIn = this->context->allowIn;
                    this->context->allowIn = false;
                    const declarations = this->parseBindingList(kind, { inFor: true });
                    this->context->allowIn = previousAllowIn;

                    if (declarations.length === 1 && declarations[0].init === null && this->matchKeyword('in')) {
                        init = this->finalize(init, new Node.VariableDeclaration(declarations, kind));
                        this->nextToken();
                        left = init;
                        right = this->parseExpression();
                        init = null;
                    } else if (declarations.length === 1 && declarations[0].init === null && this->matchContextualKeyword('of')) {
                        init = this->finalize(init, new Node.VariableDeclaration(declarations, kind));
                        this->nextToken();
                        left = init;
                        right = this->parseAssignmentExpression();
                        init = null;
                        forIn = false;
                    } else {
                        this->consumeSemicolon();
                        init = this->finalize(init, new Node.VariableDeclaration(declarations, kind));
                    }
                }
                */
            } else {
                RefPtr<ScannerResult> initStartToken = this->lookahead;
                bool previousAllowIn = this->context->allowIn;
                this->context->allowIn = false;
                init = this->inheritCoverGrammar(&Parser::parseAssignmentExpression);
                this->context->allowIn = previousAllowIn;

                if (this->matchKeyword(In)) {
                    if (init->isLiteral() || init->type() == ASTNodeType::AssignmentExpression || init->type() == ASTNodeType::ThisExpression) {
                        this->tolerateError(Messages::InvalidLHSInForIn);
                    }

                    this->nextToken();
                    this->reinterpretExpressionAsPattern(init);
                    left = init;
                    right = this->parseExpression();
                    init = nullptr;
                } else if (this->lookahead->type == Token::IdentifierToken && this->lookahead->valueString == "of") {
                    this->throwError("for of is not supported yet");
                    RELEASE_ASSERT_NOT_REACHED();
                    /*
                    if (!this->context->isAssignmentTarget || init.type === Syntax.AssignmentExpression) {
                        this->tolerateError(Messages.InvalidLHSInForLoop);
                    }

                    this->nextToken();
                    this->reinterpretExpressionAsPattern(init);
                    left = init;
                    right = this->parseAssignmentExpression();
                    init = null;
                    forIn = false;
                    */
                } else {
                    if (this->match(Comma)) {
                        ExpressionNodeVector initSeq;
                        initSeq.push_back(init);
                        while (this->match(Comma)) {
                            this->nextToken();
                            initSeq.push_back(this->isolateCoverGrammar(&Parser::parseAssignmentExpression));
                        }
                        init = this->finalize(this->startNode(initStartToken), new SequenceExpressionNode(std::move(initSeq)));
                    }
                    this->expect(SemiColon);
                }
            }
        }

        if (left == nullptr) {
            this->context->inLoop = true;
            if (!this->match(SemiColon)) {
                test = this->parseExpression();
            }
            this->expect(SemiColon);
            if (!this->match(RightParenthesis)) {
                update = this->parseExpression();
            }
        }

        Node* body = nullptr;
        if (!this->match(RightParenthesis) && this->config.tolerant) {
            this->tolerateUnexpectedToken(this->nextToken());
            body = this->finalize(this->createNode(), new EmptyStatementNode());
        } else {
            this->expect(RightParenthesis);

            bool previousInIteration = this->context->inIteration;
            this->context->inIteration = true;
            auto functor = std::bind(&Parser::parseStatement, std::ref(*this), false);
            body = this->isolateCoverGrammarWithFunctor(functor);
            this->context->inIteration = previousInIteration;
        }

        this->context->inLoop = prevInLoop;

        if (left == nullptr) {
            return this->finalize(node, new ForStatementNode(init, test, update, body));
        } else {
            if (forIn) {
                return this->finalize(node, new ForInStatementNode(left, right, body, false));
            } else {
                this->throwError("For of is not supported yet");
                RELEASE_ASSERT_NOT_REACHED();
                // return this->finalize(node, new Node.ForOfStatement(left, right, body));
            }
        }
        /*
        return (typeof left === 'undefined') ?
            this->finalize(node, new Node.ForStatement(init, test, update, body)) :
            forIn ? this->finalize(node, new Node.ForInStatement(left, right, body)) :
                this->finalize(node, new Node.ForOfStatement(left, right, body));

*/
    }

    void removeLabel(String* label)
    {
        for (size_t i = 0; i < this->context->labelSet.size(); i++) {
            if (this->context->labelSet[i].first->equals(label)) {
                this->context->labelSet.erase(this->context->labelSet.begin() + i);
                return;
            }
        }
        RELEASE_ASSERT_NOT_REACHED();
    }

    bool hasLabel(String* label)
    {
        for (size_t i = 0; i < this->context->labelSet.size(); i++) {
            if (this->context->labelSet[i].first->equals(label)) {
                return true;
            }
        }
        return false;
    }
    // ECMA-262 13.8 The continue statement

    Node* parseContinueStatement()
    {
        MetaNode node = this->createNode();
        this->expectKeyword(Continue);

        IdentifierNode* label = nullptr;
        if (this->lookahead->type == IdentifierToken && !this->hasLineTerminator) {
            label = this->parseVariableIdentifier();

            if (!hasLabel(label->name().string())) {
                this->throwError(Messages::UnknownLabel, label->name().string());
            }
        }

        this->consumeSemicolon();
        if (label == nullptr && !this->context->inIteration) {
            this->throwError(Messages::IllegalContinue);
        }

        if (label)
            return this->finalize(node, new ContinueLabelStatementNode(label->name().string()));
        else
            return this->finalize(node, new ContinueStatementNode());
    }

    // ECMA-262 13.9 The break statement

    Node* parseBreakStatement()
    {
        MetaNode node = this->createNode();
        this->expectKeyword(Break);

        IdentifierNode* label = nullptr;
        if (this->lookahead->type == IdentifierToken && !this->hasLineTerminator) {
            label = this->parseVariableIdentifier();

            if (!hasLabel(label->name().string())) {
                this->throwError(Messages::UnknownLabel, label->name().string());
            }
        }

        this->consumeSemicolon();
        if (label == nullptr && !this->context->inIteration && !this->context->inSwitch) {
            this->throwError(Messages::IllegalBreak);
        }

        if (label)
            return this->finalize(node, new BreakLabelStatementNode(label->name().string()));
        else
            return this->finalize(node, new BreakStatementNode());
    }

    // ECMA-262 13.10 The return statement

    Node* parseReturnStatement()
    {
        if (!this->context->inFunctionBody) {
            this->tolerateError(Messages::IllegalReturn);
        }

        MetaNode node = this->createNode();
        this->expectKeyword(Return);

        bool hasArgument = !this->match(SemiColon) && !this->match(RightBrace) && !this->hasLineTerminator && this->lookahead->type != EOFToken;
        Node* argument = nullptr;
        if (hasArgument) {
            argument = this->parseExpression();
        }
        this->consumeSemicolon();

        return this->finalize(node, new ReturnStatmentNode(argument));
    }

    // ECMA-262 13.11 The with statement

    Node* parseWithStatement()
    {
        if (this->context->strict) {
            this->tolerateError(Messages::StrictModeWith);
        }

        MetaNode node = this->createNode();
        this->expectKeyword(With);
        this->expect(LeftParenthesis);
        Node* object = this->parseExpression();
        this->expect(RightParenthesis);

        bool prevInWith = this->context->inWith;
        this->context->inWith = true;
        StatementNode* body = this->parseStatement(false);
        this->context->inWith = prevInWith;

        return this->finalize(node, new WithStatementNode(object, body));
    }

    // ECMA-262 13.12 The switch statement

    SwitchCaseNode* parseSwitchCase()
    {
        MetaNode node = this->createNode();

        Node* test;
        if (this->matchKeyword(Default)) {
            this->nextToken();
            test = nullptr;
        } else {
            this->expectKeyword(Case);
            test = this->parseExpression();
        }
        this->expect(Colon);

        StatementNodeVector consequent;
        while (true) {
            if (this->match(RightBrace) || this->matchKeyword(Default) || this->matchKeyword(Case)) {
                break;
            }
            consequent.push_back(this->parseStatementListItem());
        }

        return this->finalize(node, new SwitchCaseNode(test, std::move(consequent)));
    }

    SwitchStatementNode* parseSwitchStatement()
    {
        MetaNode node = this->createNode();
        this->expectKeyword(Switch);

        this->expect(LeftParenthesis);
        Node* discriminant = this->parseExpression();
        this->expect(RightParenthesis);

        bool previousInSwitch = this->context->inSwitch;
        this->context->inSwitch = true;

        StatementNodeVector casesA, casesB;
        Node* deflt = nullptr;
        bool defaultFound = false;
        this->expect(LeftBrace);
        while (true) {
            if (this->match(RightBrace)) {
                break;
            }
            SwitchCaseNode* clause = this->parseSwitchCase();
            if (clause->isDefaultNode()) {
                if (defaultFound) {
                    this->throwError(Messages::MultipleDefaultsInSwitch);
                }
                deflt = clause;
                defaultFound = true;
            } else {
                if (defaultFound) {
                    casesA.push_back(clause);
                } else {
                    casesB.push_back(clause);
                }
            }
        }
        this->expect(RightBrace);

        this->context->inSwitch = previousInSwitch;

        return this->finalize(node, new SwitchStatementNode(discriminant, std::move(casesA), deflt, std::move(casesB), false));
    }

    // ECMA-262 13.13 Labelled Statements

    Node* parseLabelledStatement()
    {
        MetaNode node = this->createNode();
        Node* expr = this->parseExpression();

        StatementNode* statement;
        if ((expr->type() == Identifier) && this->match(Colon)) {
            this->nextToken();

            IdentifierNode* id = (IdentifierNode*)expr;
            if (hasLabel(id->name().string())) {
                this->throwError(Messages::Redeclaration, new ASCIIString("Label"), id->name().string());
            }

            this->context->labelSet.push_back(std::make_pair(id->name().string(), true));
            StatementNode* labeledBody = this->parseStatement(this->context->strict ? false : true);
            removeLabel(id->name().string());

            statement = new LabeledStatementNode(labeledBody, id->name().string());
        } else {
            this->consumeSemicolon();
            statement = new ExpressionStatementNode(expr);
        }

        return this->finalize(node, statement);
    }

    // ECMA-262 13.14 The throw statement

    Node* parseThrowStatement()
    {
        MetaNode node = this->createNode();
        this->expectKeyword(Throw);

        if (this->hasLineTerminator) {
            this->throwError(Messages::NewlineAfterThrow);
        }

        Node* argument = this->parseExpression();
        this->consumeSemicolon();

        return this->finalize(node, new ThrowStatementNode(argument));
    }

    // ECMA-262 13.15 The try statement

    CatchClauseNode* parseCatchClause()
    {
        MetaNode node = this->createNode();

        this->expectKeyword(Catch);

        this->expect(LeftParenthesis);
        if (this->match(RightParenthesis)) {
            this->throwUnexpectedToken(this->lookahead);
        }

        bool prevInCatch = this->context->inCatch;
        this->context->inCatch = true;

        std::vector<FunctionDeclarationNode*, GCUtil::gc_malloc_ignore_off_page_allocator<FunctionDeclarationNode*>> vecBefore = std::move(this->context->functionDeclarationsInDirectCatchScope);
        bool prevInDirectCatchScope = this->context->inDirectCatchScope;
        this->context->inDirectCatchScope = true;

        std::vector<RefPtr<ScannerResult>, GCUtil::gc_malloc_ignore_off_page_allocator<RefPtr<ScannerResult>>> params;
        Node* param = this->parsePattern(params);

        std::vector<String*, GCUtil::gc_malloc_ignore_off_page_allocator<String*>> paramMap;
        for (size_t i = 0; i < params.size(); i++) {
            bool has = false;
            for (size_t j = 0; j < paramMap.size(); j++) {
                if (paramMap[j]->equals(&params[i]->valueString)) {
                    has = true;
                }
            }
            if (has) {
                this->tolerateError(Messages::DuplicateBinding, &params[i]->valueString);
            } else {
                paramMap.push_back(new StringView(params[i]->valueString));
            }
        }

        if (this->context->strict && param->type() == Identifier) {
            IdentifierNode* id = (IdentifierNode*)param;
            if (this->scanner->isRestrictedWord(id->name())) {
                this->tolerateError(Messages::StrictCatchVariable);
            }
        }

        this->expect(RightParenthesis);
        Node* body = this->parseBlock();

        this->context->inCatch = prevInCatch;

        this->context->inDirectCatchScope = prevInDirectCatchScope;

        std::vector<FunctionDeclarationNode*, GCUtil::gc_malloc_ignore_off_page_allocator<FunctionDeclarationNode*>> vec = std::move(this->context->functionDeclarationsInDirectCatchScope);

        this->context->functionDeclarationsInDirectCatchScope = std::move(vecBefore);

        return this->finalize(node, new CatchClauseNode(param, nullptr, body, vec));
    }

    BlockStatementNode* parseFinallyClause()
    {
        this->expectKeyword(Finally);
        return this->parseBlock();
    }

    TryStatementNode* parseTryStatement()
    {
        MetaNode node = this->createNode();
        this->expectKeyword(Try);

        BlockStatementNode* block = this->parseBlock();
        CatchClauseNode* handler = this->matchKeyword(Catch) ? this->parseCatchClause() : nullptr;
        BlockStatementNode* finalizer = this->matchKeyword(Finally) ? this->parseFinallyClause() : nullptr;

        if (!handler && !finalizer) {
            this->throwError(Messages::NoCatchOrFinally);
        }

        return this->finalize(node, new TryStatementNode(block, handler, CatchClauseNodeVector(), finalizer));
    }

    // ECMA-262 13.16 The debugger statement

    StatementNode* parseDebuggerStatement()
    {
        this->throwError("debugger keyword is not supported yet");
        RELEASE_ASSERT_NOT_REACHED();
        /*
        const node = this->createNode();
        this->expectKeyword('debugger');
        this->consumeSemicolon();
        return this->finalize(node, new Node.DebuggerStatement());
        */
    }

    // ECMA-262 13 Statements
    StatementNode* parseStatement(bool allowFunctionDeclaration = true)
    {
        checkRecursiveLimit();
        StatementNode* statement = nullptr;
        switch (this->lookahead->type) {
        case Token::BooleanLiteralToken:
        case Token::NullLiteralToken:
        case Token::NumericLiteralToken:
        case Token::StringLiteralToken:
        case Token::TemplateToken:
        case Token::RegularExpressionToken:
            statement = this->parseExpressionStatement();
            break;

        case Token::PunctuatorToken: {
            PunctuatorsKind value = this->lookahead->valuePunctuatorsKind;
            if (value == LeftBrace) {
                statement = this->parseBlock();
            } else if (value == LeftParenthesis) {
                statement = this->parseExpressionStatement();
            } else if (value == SemiColon) {
                statement = this->parseEmptyStatement();
            } else {
                statement = this->parseExpressionStatement();
            }
            break;
        }
        case Token::IdentifierToken:
            statement = asStatementNode(this->parseLabelledStatement());
            break;

        case Token::KeywordToken:
            switch (this->lookahead->valueKeywordKind) {
            case Break:
                statement = asStatementNode(this->parseBreakStatement());
                break;
            case Continue:
                statement = asStatementNode(this->parseContinueStatement());
                break;
            case Debugger:
                statement = asStatementNode(this->parseDebuggerStatement());
                break;
            case Do:
                statement = asStatementNode(this->parseDoWhileStatement());
                break;
            case For:
                statement = asStatementNode(this->parseForStatement());
                break;
            case Function: {
                if (!allowFunctionDeclaration) {
                    this->throwUnexpectedToken(this->lookahead);
                }
                statement = asStatementNode(this->parseFunctionDeclaration());
                break;
            }
            case If:
                statement = asStatementNode(this->parseIfStatement());
                break;
            case Return:
                statement = asStatementNode(this->parseReturnStatement());
                break;
            case Switch:
                statement = asStatementNode(this->parseSwitchStatement());
                break;
            case Throw:
                statement = asStatementNode(this->parseThrowStatement());
                break;
            case Try:
                statement = asStatementNode(this->parseTryStatement());
                break;
            case Var:
                statement = asStatementNode(this->parseVariableStatement());
                break;
            case While:
                statement = asStatementNode(this->parseWhileStatement());
                break;
            case With:
                statement = asStatementNode(this->parseWithStatement());
                break;
            default:
                statement = asStatementNode(this->parseExpressionStatement());
                break;
            }
            break;

        default:
            this->throwUnexpectedToken(this->lookahead);
        }

        return statement;
    }

    // ECMA-262 14.1 Function Definition

    BlockStatementNode* parseFunctionSourceElements()
    {
        if (this->config.parseSingleFunction) {
            if (this->config.parseSingleFunctionChildIndex.asUint32()) {
                size_t realIndex = this->config.parseSingleFunctionChildIndex.asUint32() - 1;
                this->config.parseSingleFunctionChildIndex = SmallValue(this->config.parseSingleFunctionChildIndex.asUint32() + 1);
                InterpretedCodeBlock* currentTarget = this->config.parseSingleFunctionTarget->asInterpretedCodeBlock();
                size_t orgIndex = this->lookahead->index;
                this->expect(LeftBrace);

                StringView src = currentTarget->childBlocks()[realIndex]->src();
                this->scanner->index = src.length() + orgIndex;

                this->scanner->lineNumber = currentTarget->childBlocks()[realIndex]->sourceElementStart().line;
                this->scanner->lineStart = currentTarget->childBlocks()[realIndex]->sourceElementStart().index - currentTarget->childBlocks()[realIndex]->sourceElementStart().column;
                this->lookahead->lineNumber = this->scanner->lineNumber;
                this->lookahead->lineNumber = this->scanner->lineStart;
                this->lookahead->type = Token::PunctuatorToken;
                this->lookahead->valuePunctuatorsKind = PunctuatorsKind::RightBrace;
                this->expect(RightBrace);
                return this->finalize(this->createNode(), new BlockStatementNode(std::move(StatementNodeVector())));
            }
            this->config.parseSingleFunctionChildIndex = SmallValue(this->config.parseSingleFunctionChildIndex.asUint32() + 1);
        }
        bool prevInDirectCatchScope = this->context->inDirectCatchScope;
        this->context->inDirectCatchScope = false;

        MetaNode nodeStart = this->createNode();

        this->expect(LeftBrace);
        StatementNodeVector body = this->parseDirectivePrologues();

        auto previousLabelSet = this->context->labelSet;
        bool previousInIteration = this->context->inIteration;
        bool previousInSwitch = this->context->inSwitch;
        bool previousInFunctionBody = this->context->inFunctionBody;

        this->context->labelSet.clear();
        this->context->inIteration = false;
        this->context->inSwitch = false;
        this->context->inFunctionBody = true;

        while (this->startMarker.index < this->scanner->length) {
            if (this->match(RightBrace)) {
                break;
            }
            body.push_back(this->parseStatementListItem());
        }

        this->expect(RightBrace);

        this->context->labelSet = previousLabelSet;
        this->context->inIteration = previousInIteration;
        this->context->inSwitch = previousInSwitch;
        this->context->inFunctionBody = previousInFunctionBody;

        scopeContexts.back()->m_locStart.line = nodeStart.line;
        scopeContexts.back()->m_locStart.column = nodeStart.column;
        scopeContexts.back()->m_locStart.index = nodeStart.index;

        scopeContexts.back()->m_locEnd.index = this->lastMarker.index;
#ifndef NDEBUG
        scopeContexts.back()->m_locEnd.line = this->lastMarker.lineNumber;
        scopeContexts.back()->m_locEnd.column = this->lastMarker.index - this->lastMarker.lineStart;
#endif

        this->context->inDirectCatchScope = prevInDirectCatchScope;

        if (this->config.parseSingleFunction) {
            return this->finalize(nodeStart, new BlockStatementNode(std::move(body)));
        } else {
            for (size_t i = 0; i < body.size(); i++) {
                delete body[i];
            }
            return this->finalize(nodeStart, new BlockStatementNode(std::move(StatementNodeVector())));
        }
    }

    FunctionDeclarationNode* parseFunctionDeclaration(bool identifierIsOptional = false)
    {
        MetaNode node = this->createNode();
        this->expectKeyword(Function);

        bool isGenerator = this->match(Multiply);
        if (isGenerator) {
            this->nextToken();
        }

        const char* message = nullptr;
        IdentifierNode* id = nullptr;
        RefPtr<ScannerResult> firstRestricted = nullptr;

        if (!identifierIsOptional || !this->match(LeftParenthesis)) {
            RefPtr<ScannerResult> token = this->lookahead;
            id = this->parseVariableIdentifier();
            if (this->context->strict) {
                if (this->scanner->isRestrictedWord(token->valueString)) {
                    this->tolerateUnexpectedToken(token, Messages::StrictFunctionName);
                }
            } else {
                if (this->scanner->isRestrictedWord(token->valueString)) {
                    firstRestricted = token;
                    message = Messages::StrictFunctionName;
                } else if (this->scanner->isStrictModeReservedWord(token->valueString)) {
                    firstRestricted = token;
                    message = Messages::StrictReservedWord;
                }
            }
        }

        bool previousAllowYield = this->context->allowYield;
        this->context->allowYield = !isGenerator;

        ParseFormalParametersResult formalParameters = this->parseFormalParameters(firstRestricted);
        PatternNodeVector params = std::move(formalParameters.params);
        RefPtr<ScannerResult> stricted = formalParameters.stricted;
        firstRestricted = formalParameters.firstRestricted;
        if (formalParameters.message) {
            message = formalParameters.message;
        }

        scopeContexts.back()->insertName(id->name(), true);
        scopeContexts.back()->insertUsingName(id->name());
        pushScopeContext(params, id->name());
        extractNamesFromFunctionParams(params);

        bool previousStrict = this->context->strict;
        BlockStatementNode* body = this->parseFunctionSourceElements();
        if (this->context->strict && firstRestricted) {
            this->throwUnexpectedToken(firstRestricted, message);
        }
        if (this->context->strict && stricted) {
            this->tolerateUnexpectedToken(stricted, message);
        }

        this->context->strict = previousStrict;
        this->context->allowYield = previousAllowYield;

        if (this->context->inDirectCatchScope) {
            scopeContexts.back()->m_needsSpecialInitialize = true;
        }

        FunctionDeclarationNode* fd = this->finalize(node, new FunctionDeclarationNode(id->name(), std::move(params), body, popScopeContext(node), isGenerator));

        if (this->context->inDirectCatchScope) {
            this->context->functionDeclarationsInDirectCatchScope.push_back(fd);
        }

        return fd;
    }

    FunctionExpressionNode* parseFunctionExpression()
    {
        MetaNode node = this->createNode();
        this->expectKeyword(Function);

        bool isGenerator = this->match(Multiply);
        if (isGenerator) {
            this->nextToken();
        }

        const char* message = nullptr;
        IdentifierNode* id = nullptr;
        RefPtr<ScannerResult> firstRestricted = nullptr;

        bool previousAllowYield = this->context->allowYield;
        this->context->allowYield = !isGenerator;

        if (!this->match(LeftParenthesis)) {
            RefPtr<ScannerResult> token = this->lookahead;
            id = (!this->context->strict && !isGenerator && this->matchKeyword(Yield)) ? this->parseIdentifierName() : this->parseVariableIdentifier();
            if (this->context->strict) {
                if (this->scanner->isRestrictedWord(token->valueString)) {
                    this->tolerateUnexpectedToken(token, Messages::StrictFunctionName);
                }
            } else {
                if (this->scanner->isRestrictedWord(token->valueString)) {
                    firstRestricted = token;
                    message = Messages::StrictFunctionName;
                } else if (this->scanner->isStrictModeReservedWord(token->valueString)) {
                    firstRestricted = token;
                    message = Messages::StrictReservedWord;
                }
            }
        }

        ParseFormalParametersResult formalParameters = this->parseFormalParameters(firstRestricted);
        PatternNodeVector params = std::move(formalParameters.params);
        RefPtr<ScannerResult> stricted = formalParameters.stricted;
        firstRestricted = formalParameters.firstRestricted;
        if (formalParameters.message) {
            message = formalParameters.message;
        }

        AtomicString fnName;
        if (id)
            fnName = id->name();

        pushScopeContext(params, fnName);

        if (id) {
            scopeContexts.back()->insertName(fnName, false);
            scopeContexts.back()->insertUsingName(fnName);
        }

        extractNamesFromFunctionParams(params);
        bool previousStrict = this->context->strict;
        BlockStatementNode* body = this->parseFunctionSourceElements();
        if (this->context->strict && firstRestricted) {
            this->throwUnexpectedToken(firstRestricted, message);
        }
        if (this->context->strict && stricted) {
            this->tolerateUnexpectedToken(stricted, message);
        }
        this->context->strict = previousStrict;
        this->context->allowYield = previousAllowYield;

        return this->finalize(node, new FunctionExpressionNode(fnName, std::move(params), body, popScopeContext(node), isGenerator));
    }

    // ECMA-262 14.1.1 Directive Prologues

    Node* parseDirective()
    {
        RefPtr<ScannerResult> token = this->lookahead;
        StringView directiveValue;
        bool isLiteral = false;

        MetaNode node = this->createNode();
        Node* expr = this->parseExpression();
        if (expr->type() == Literal) {
            isLiteral = true;
            directiveValue = token->valueString;
        }
        this->consumeSemicolon();

        if (isLiteral) {
            return this->finalize(node, new DirectiveNode(asExpressionNode(expr), directiveValue));
        } else {
            return this->finalize(node, new ExpressionStatementNode(expr));
        }
    }

    StatementNodeVector parseDirectivePrologues()
    {
        RefPtr<ScannerResult> firstRestricted = nullptr;

        StatementNodeVector body;
        while (true) {
            RefPtr<ScannerResult> token = this->lookahead;
            if (token->type != StringLiteralToken) {
                break;
            }

            Node* statement = this->parseDirective();
            body.push_back(statement);

            if (statement->type() != Directive) {
                break;
            }

            DirectiveNode* directive = (DirectiveNode*)statement;
            if (token->plain && directive->value().equals("use strict")) {
                this->scopeContexts.back()->m_isStrict = this->context->strict = true;
                if (firstRestricted) {
                    this->tolerateUnexpectedToken(firstRestricted, Messages::StrictOctalLiteral);
                }
            } else {
                if (!firstRestricted && token->octal) {
                    firstRestricted = token;
                }
            }
        }

        return body;
    }

    // ECMA-262 14.3 Method Definitions

    FunctionExpressionNode* parseGetterMethod()
    {
        MetaNode node = this->createNode();
        this->expect(LeftParenthesis);
        this->expect(RightParenthesis);

        bool isGenerator = false;
        ParseFormalParametersResult params(PatternNodeVector(), nullptr, nullptr, nullptr);
        bool previousAllowYield = this->context->allowYield;
        this->context->allowYield = false;
        Node* method = this->parsePropertyMethod(params);
        this->context->allowYield = previousAllowYield;

        extractNamesFromFunctionParams(params.params);
        return this->finalize(node, new FunctionExpressionNode(AtomicString(), std::move(params.params), method, popScopeContext(node), isGenerator));
    }

    FunctionExpressionNode* parseSetterMethod()
    {
        MetaNode node = this->createNode();

        ParseParameterOptions options;

        bool isGenerator = false;
        bool previousAllowYield = this->context->allowYield;
        this->context->allowYield = false;

        this->expect(LeftParenthesis);
        if (this->match(RightParenthesis)) {
            this->tolerateUnexpectedToken(this->lookahead);
        } else {
            this->parseFormalParameter(options);
        }
        this->expect(RightParenthesis);

        ParseFormalParametersResult options2(std::move(options.params), options.stricted, options.firstRestricted, options.message);
        Node* method = this->parsePropertyMethod(options2);
        this->context->allowYield = previousAllowYield;

        extractNamesFromFunctionParams(options.params);
        return this->finalize(node, new FunctionExpressionNode(AtomicString(), std::move(options.params), method, popScopeContext(node), isGenerator));
    }

    FunctionExpressionNode* parseGeneratorMethod()
    {
        // TODO
        this->throwUnexpectedToken(this->nextToken());
        RELEASE_ASSERT_NOT_REACHED();
        /*
        MetaNode node = this->createNode();
        const isGenerator = true;
        const previousAllowYield = this->context.allowYield;

        this->context.allowYield = true;
        const params = this->parseFormalParameters();
        this->context.allowYield = false;
        const method = this->parsePropertyMethod(params);
        this->context.allowYield = previousAllowYield;

        return this->finalize(node, new Node.FunctionExpression(null, params.params, method, isGenerator));
        */
    }

    // ECMA-262 14.4 Generator Function Definitions

    Node* parseYieldExpression()
    {
        this->throwError("yield keyword is not supported yet");
        RELEASE_ASSERT_NOT_REACHED();
        /*
        const node = this->createNode();
        this->expectKeyword('yield');

        let argument = null;
        let delegate = false;
        if (!this->hasLineTerminator) {
            const previousAllowYield = this->context.allowYield;
            this->context.allowYield = false;
            delegate = this->match('*');
            if (delegate) {
                this->nextToken();
                argument = this->parseAssignmentExpression();
            } else {
                if (!this->match(';') && !this->match('}') && !this->match(')') && this->lookahead.type !== Token.EOF) {
                    argument = this->parseAssignmentExpression();
                }
            }
            this->context.allowYield = previousAllowYield;
        }

        return this->finalize(node, new Node.YieldExpression(argument, delegate));
        */
    }

    // ECMA-262 14.5 Class Definitions
    /*
    parseClassElement(hasConstructor): Node.Property {
        let token = this.lookahead;
        let node = this.createNode();

        let kind: string;
        let key: Node.PropertyKey;
        let value: Node.FunctionExpression;
        let computed = false;
        let method = false;
        let isStatic = false;

        if (this.match('*')) {
            this.nextToken();
        } else {
            computed = this.match('[');
            key = this.parseObjectPropertyKey();
            const id = <Node.Identifier>key;
            if (id.name === 'static' && (this.qualifiedPropertyName(this.lookahead) || this.match('*'))) {
                token = this.lookahead;
                isStatic = true;
                computed = this.match('[');
                if (this.match('*')) {
                    this.nextToken();
                } else {
                    key = this.parseObjectPropertyKey();
                }
            }
        }

        const lookaheadPropertyKey = this.qualifiedPropertyName(this.lookahead);
        if (token.type === Token.Identifier) {
            if (token.value === 'get' && lookaheadPropertyKey) {
                kind = 'get';
                computed = this.match('[');
                key = this.parseObjectPropertyKey();
                this.context.allowYield = false;
                value = this.parseGetterMethod();
            } else if (token.value === 'set' && lookaheadPropertyKey) {
                kind = 'set';
                computed = this.match('[');
                key = this.parseObjectPropertyKey();
                value = this.parseSetterMethod();
            }
        } else if (token.type === Token.Punctuator && token.value === '*' && lookaheadPropertyKey) {
            kind = 'init';
            computed = this.match('[');
            key = this.parseObjectPropertyKey();
            value = this.parseGeneratorMethod();
            method = true;
        }

        if (!kind && key && this.match('(')) {
            kind = 'init';
            value = this.parsePropertyMethodFunction();
            method = true;
        }

        if (!kind) {
            this.throwUnexpectedToken(this.lookahead);
        }

        if (kind === 'init') {
            kind = 'method';
        }

        if (!computed) {
            if (isStatic && this.isPropertyKey(key, 'prototype')) {
                this.throwUnexpectedToken(token, Messages.StaticPrototype);
            }
            if (!isStatic && this.isPropertyKey(key, 'constructor')) {
                if (kind !== 'method' || !method || value.generator) {
                    this.throwUnexpectedToken(token, Messages.ConstructorSpecialMethod);
                }
                if (hasConstructor.value) {
                    this.throwUnexpectedToken(token, Messages.DuplicateConstructor);
                } else {
                    hasConstructor.value = true;
                }
                kind = 'constructor';
            }
        }


        return this.finalize(node, new Node.MethodDefinition(key, computed, value, kind, isStatic));
    }

    parseClassElementList(): Node.Property[] {
        const body = [];
        let hasConstructor = { value: false };

        this.expect('{');
        while (!this.match('}')) {
            if (this.match(';')) {
                this.nextToken();
            } else {
                body.push(this.parseClassElement(hasConstructor));
            }
        }
        this.expect('}');

        return body;
    }

    parseClassBody(): Node.ClassBody {
        const node = this.createNode();
        const elementList = this.parseClassElementList();

        return this.finalize(node, new Node.ClassBody(elementList));
    }

    parseClassDeclaration(identifierIsOptional?: boolean): Node.ClassDeclaration {
        const node = this.createNode();

        const previousStrict = this.context.strict;
        this.context.strict = true;
        this.expectKeyword('class');

        const id = (identifierIsOptional && (this.lookahead.type !== Token.Identifier)) ? null : this.parseVariableIdentifier();
        let superClass = null;
        if (this.matchKeyword('extends')) {
            this.nextToken();
            superClass = this.isolateCoverGrammar(this.parseLeftHandSideExpressionAllowCall);
        }
        const classBody = this.parseClassBody();
        this.context.strict = previousStrict;

        return this.finalize(node, new Node.ClassDeclaration(id, superClass, classBody));
    }

    parseClassExpression(): Node.ClassExpression {
        const node = this.createNode();

        const previousStrict = this.context.strict;
        this.context.strict = true;
        this.expectKeyword('class');
        const id = (this.lookahead.type === Token.Identifier) ? this.parseVariableIdentifier() : null;
        let superClass = null;
        if (this.matchKeyword('extends')) {
            this.nextToken();
            superClass = this.isolateCoverGrammar(this.parseLeftHandSideExpressionAllowCall);
        }
        const classBody = this.parseClassBody();
        this.context.strict = previousStrict;

        return this.finalize(node, new Node.ClassExpression(id, superClass, classBody));
    }
    */

    // ECMA-262 15.1 Scripts
    // ECMA-262 15.2 Modules

    ProgramNode* parseProgram()
    {
        MetaNode node = this->createNode();
        scopeContexts.push_back(new ASTScopeContext(this->context->strict));
        StatementNodeVector body = this->parseDirectivePrologues();
        while (this->startMarker.index < this->scanner->length) {
            body.push_back(this->parseStatementListItem());
        }
        scopeContexts.back()->m_locStart.line = node.line;
        scopeContexts.back()->m_locStart.column = node.column;
        scopeContexts.back()->m_locStart.index = node.index;

        MetaNode endNode = this->createNode();
#ifndef NDEBUG
        scopeContexts.back()->m_locEnd.line = endNode.line;
        scopeContexts.back()->m_locEnd.column = endNode.column;
#endif
        scopeContexts.back()->m_locEnd.index = endNode.index;
        return this->finalize(node, new ProgramNode(std::move(body), scopeContexts.back() /*, this->sourceType*/));
    }

    // ECMA-262 15.2.2 Imports
    /*
    parseModuleSpecifier(): Node.Literal {
        const node = this.createNode();

        if (this.lookahead.type !== Token.StringLiteral) {
            this.throwError(Messages.InvalidModuleSpecifier);
        }

        const token = this.nextToken();
        const raw = this.getTokenRaw(token);
        return this.finalize(node, new Node.Literal(token.value, raw));
    }

    // import {<foo as bar>} ...;
    parseImportSpecifier(): Node.ImportSpecifier {
        const node = this.createNode();

        let local;
        const imported = this.parseIdentifierName();
        if (this.matchContextualKeyword('as')) {
            this.nextToken();
            local = this.parseVariableIdentifier();
        } else {
            local = imported;
        }

        return this.finalize(node, new Node.ImportSpecifier(local, imported));
    }

    // {foo, bar as bas}
    parseNamedImports(): Node.ImportSpecifier[] {
        this.expect('{');
        const specifiers: Node.ImportSpecifier[] = [];
        while (!this.match('}')) {
            specifiers.push(this.parseImportSpecifier());
            if (!this.match('}')) {
                this.expect(',');
            }
        }
        this.expect('}');

        return specifiers;
    }

    // import <foo> ...;
    parseImportDefaultSpecifier(): Node.ImportDefaultSpecifier {
        const node = this.createNode();
        const local = this.parseIdentifierName();
        return this.finalize(node, new Node.ImportDefaultSpecifier(local));
    }

    // import <* as foo> ...;
    parseImportNamespaceSpecifier(): Node.ImportNamespaceSpecifier {
        const node = this.createNode();

        this.expect('*');
        if (!this.matchContextualKeyword('as')) {
            this.throwError(Messages.NoAsAfterImportNamespace);
        }
        this.nextToken();
        const local = this.parseIdentifierName();

        return this.finalize(node, new Node.ImportNamespaceSpecifier(local));
    }

    parseImportDeclaration(): Node.ImportDeclaration {
        if (this.context.inFunctionBody) {
            this.throwError(Messages.IllegalImportDeclaration);
        }

        const node = this.createNode();
        this.expectKeyword('import');

        let src: Node.Literal;
        let specifiers: Node.ImportDeclarationSpecifier[] = [];
        if (this.lookahead.type === Token.StringLiteral) {
            // import 'foo';
            src = this.parseModuleSpecifier();
        } else {
            if (this.match('{')) {
                // import {bar}
                specifiers = specifiers.concat(this.parseNamedImports());
            } else if (this.match('*')) {
                // import * as foo
                specifiers.push(this.parseImportNamespaceSpecifier());
            } else if (this.isIdentifierName(this.lookahead) && !this.matchKeyword('default')) {
                // import foo
                specifiers.push(this.parseImportDefaultSpecifier());
                if (this.match(',')) {
                    this.nextToken();
                    if (this.match('*')) {
                        // import foo, * as foo
                        specifiers.push(this.parseImportNamespaceSpecifier());
                    } else if (this.match('{')) {
                        // import foo, {bar}
                        specifiers = specifiers.concat(this.parseNamedImports());
                    } else {
                        this.throwUnexpectedToken(this.lookahead);
                    }
                }
            } else {
                this.throwUnexpectedToken(this.nextToken());
            }

            if (!this.matchContextualKeyword('from')) {
                const message = this.lookahead.value ? Messages.UnexpectedToken : Messages.MissingFromClause;
                this.throwError(message, this.lookahead.value);
            }
            this.nextToken();
            src = this.parseModuleSpecifier();
        }
        this.consumeSemicolon();

        return this.finalize(node, new Node.ImportDeclaration(specifiers, src));
    }

    // ECMA-262 15.2.3 Exports

    parseExportSpecifier(): Node.ExportSpecifier {
        const node = this.createNode();

        const local = this.parseIdentifierName();
        let exported = local;
        if (this.matchContextualKeyword('as')) {
            this.nextToken();
            exported = this.parseIdentifierName();
        }

        return this.finalize(node, new Node.ExportSpecifier(local, exported));
    }

    parseExportDeclaration(): Node.ExportDeclaration {
        if (this.context.inFunctionBody) {
            this.throwError(Messages.IllegalExportDeclaration);
        }

        const node = this.createNode();
        this.expectKeyword('export');

        let exportDeclaration;
        if (this.matchKeyword('default')) {
            // export default ...
            this.nextToken();
            if (this.matchKeyword('function')) {
                // export default function foo () {}
                // export default function () {}
                const declaration = this.parseFunctionDeclaration(true);
                exportDeclaration = this.finalize(node, new Node.ExportDefaultDeclaration(declaration));
            } else if (this.matchKeyword('class')) {
                // export default class foo {}
                const declaration = this.parseClassDeclaration(true);
                exportDeclaration = this.finalize(node, new Node.ExportDefaultDeclaration(declaration));
            } else {
                if (this.matchContextualKeyword('from')) {
                    this.throwError(Messages.UnexpectedToken, this.lookahead.value);
                }
                // export default {};
                // export default [];
                // export default (1 + 2);
                const declaration = this.match('{') ? this.parseObjectInitializer() :
                    this.match('[') ? this.parseArrayInitializer() : this.parseAssignmentExpression();
                this.consumeSemicolon();
                exportDeclaration = this.finalize(node, new Node.ExportDefaultDeclaration(declaration));
            }

        } else if (this.match('*')) {
            // export * from 'foo';
            this.nextToken();
            if (!this.matchContextualKeyword('from')) {
                const message = this.lookahead.value ? Messages.UnexpectedToken : Messages.MissingFromClause;
                this.throwError(message, this.lookahead.value);
            }
            this.nextToken();
            const src = this.parseModuleSpecifier();
            this.consumeSemicolon();
            exportDeclaration = this.finalize(node, new Node.ExportAllDeclaration(src));

        } else if (this.lookahead.type === Token.Keyword) {
            // export var f = 1;
            let declaration;
            switch (this.lookahead.value) {
                case 'let':
                case 'const':
                    declaration = this.parseLexicalDeclaration({ inFor: false });
                    break;
                case 'var':
                case 'class':
                case 'function':
                    declaration = this.parseStatementListItem();
                    break;
                default:
                    this.throwUnexpectedToken(this.lookahead);
            }
            exportDeclaration = this.finalize(node, new Node.ExportNamedDeclaration(declaration, [], null));

        } else {
            const specifiers = [];
            let source = null;
            let isExportFromIdentifier = false;

            this.expect('{');
            while (!this.match('}')) {
                isExportFromIdentifier = isExportFromIdentifier || this.matchKeyword('default');
                specifiers.push(this.parseExportSpecifier());
                if (!this.match('}')) {
                    this.expect(',');
                }
            }
            this.expect('}');

            if (this.matchContextualKeyword('from')) {
                // export {default} from 'foo';
                // export {foo} from 'foo';
                this.nextToken();
                source = this.parseModuleSpecifier();
                this.consumeSemicolon();
            } else if (isExportFromIdentifier) {
                // export {default}; // missing fromClause
                const message = this.lookahead.value ? Messages.UnexpectedToken : Messages.MissingFromClause;
                this.throwError(message, this.lookahead.value);
            } else {
                // export {foo};
                this.consumeSemicolon();
            }
            exportDeclaration = this.finalize(node, new Node.ExportNamedDeclaration(null, specifiers, source));
        }

        return exportDeclaration;
    }
    */
};


ProgramNode* parseProgram(::Escargot::Context* ctx, StringView source, ParserASTNodeHandler handler, bool strictFromOutside, size_t stackRemain)
{
    Parser parser(ctx, source, handler, stackRemain);
    parser.context->strict = strictFromOutside;
    return parser.parseProgram();
}

std::pair<Node*, ASTScopeContext*> parseSingleFunction(::Escargot::Context* ctx, InterpretedCodeBlock* codeBlock, size_t stackRemain)
{
    Parser parser(ctx, codeBlock->src(), nullptr, stackRemain, codeBlock->sourceElementStart().line, codeBlock->sourceElementStart().column);
    parser.config.parseSingleFunction = true;
    parser.config.parseSingleFunctionTarget = codeBlock;
    auto scopeCtx = new ASTScopeContext(codeBlock->isStrict());
    parser.scopeContexts.pushBack(scopeCtx);
    return std::make_pair(parser.parseFunctionSourceElements(), scopeCtx);
}

bool isIdentifierPartData[0x10000] = {
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1,
    0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1,
    0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1,
    1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1,
    1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1,
    0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0,
    1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0,
    1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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    1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
    0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};

bool isIdentifierStartData[0x10000] = {
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1,
    0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1,
    0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1,
    1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1,
    1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1,
    0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0,
    1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0,
    1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
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    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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};
}
}