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implement String.prototype.charAt

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Signed-off-by: seonghyun kim <sh8281.kim@samsung.com>
This commit is contained in:
seonghyun kim 2016-12-14 18:24:02 +09:00
commit d9948bcded
2 changed files with 30 additions and 1 deletions
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29
src/runtime/GlobalObjectBuiltinString.cpp
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@ -298,6 +298,31 @@ static Value builtinStringCharCodeAt(ExecutionState& state, Value thisValue, siz
return ret;
}
static Value builtinStringCharAt(ExecutionState& state, Value thisValue, size_t argc, Value* argv, bool isNewExpression)
{
RESOLVE_THIS_BINDING_TO_STRING(str, String, charAt);
int64_t position;
if (argc == 0) {
position = 0;
} else if (argc > 0) {
position = argv[0].toInteger(state);
} else {
return Value(String::emptyString);
}
if (LIKELY(0 <= position && position < (int64_t)str->length())) {
char16_t c = str->charAt(position);
if (LIKELY(c < ESCARGOT_ASCII_TABLE_MAX)) {
return state.context()->staticStrings().asciiTable[c].string();
} else {
return String::fromCharCode(c);
}
} else {
return String::emptyString;
}
}
static Value builtinStringFromCharCode(ExecutionState& state, Value thisValue, size_t argc, Value* argv, bool isNewExpression)
{
if (argc == 1) {
@ -377,6 +402,10 @@ void GlobalObject::installString(ExecutionState& state)
m_stringPrototype->defineOwnPropertyThrowsException(state, ObjectPropertyName(state.context()->staticStrings().charCodeAt),
ObjectPropertyDescriptorForDefineOwnProperty(new FunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().charCodeAt, builtinStringCharCodeAt, 1, nullptr, NativeFunctionInfo::Strict)), (ObjectPropertyDescriptorForDefineOwnProperty::PresentAttribute)(ObjectPropertyDescriptorForDefineOwnProperty::WritablePresent | ObjectPropertyDescriptorForDefineOwnProperty::ConfigurablePresent)));
m_stringPrototype->defineOwnPropertyThrowsException(state, ObjectPropertyName(state.context()->staticStrings().charAt),
ObjectPropertyDescriptorForDefineOwnProperty(new FunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().charAt, builtinStringCharAt, 1, nullptr, NativeFunctionInfo::Strict)), (ObjectPropertyDescriptorForDefineOwnProperty::PresentAttribute)(ObjectPropertyDescriptorForDefineOwnProperty::WritablePresent | ObjectPropertyDescriptorForDefineOwnProperty::ConfigurablePresent)));
m_string->defineOwnPropertyThrowsException(state, ObjectPropertyName(state.context()->staticStrings().fromCharCode),
ObjectPropertyDescriptorForDefineOwnProperty(new FunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().fromCharCode, builtinStringFromCharCode, 1, nullptr, NativeFunctionInfo::Strict)), (ObjectPropertyDescriptorForDefineOwnProperty::PresentAttribute)(ObjectPropertyDescriptorForDefineOwnProperty::WritablePresent | ObjectPropertyDescriptorForDefineOwnProperty::ConfigurablePresent)));