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Implement Array.prototype.slice

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Junyoung Cho 2016-12-15 14:47:47 +09:00
commit ee1f78f348
1 changed files with 30 additions and 0 deletions
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30
src/runtime/GlobalObjectBuiltinArray.cpp
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@ -191,6 +191,34 @@ static Value builtinArrayConcat(ExecutionState& state, Value thisValue, size_t a
return array;
}
static Value builtinArraySlice(ExecutionState& state, Value thisValue, size_t argc, Value* argv, bool isNewExpression)
{
RESOLVE_THIS_BINDING_TO_OBJECT(thisObject, Array, concat);
uint32_t len = thisObject->length(state);
double relativeStart = argv[0].toInteger(state);
uint32_t k = (relativeStart < 0) ? std::max((double)len + relativeStart, 0.0) : std::min(relativeStart, (double)len);
double relativeEnd = (argv[1].isUndefined()) ? len : argv[1].toInteger(state);
uint32_t finalEnd = (relativeEnd < 0) ? std::max((double)len + relativeEnd, 0.0) : std::min(relativeEnd, (double)len);
uint32_t n = 0;
ArrayObject* array = new ArrayObject(state);
while (k < finalEnd) {
ObjectGetResult exists = thisObject->get(state, ObjectPropertyName(state, Value(k)));
if (exists.hasValue()) {
array->defineOwnPropertyThrowsException(state, ObjectPropertyName(state, Value(n)),
ObjectPropertyDescriptorForDefineOwnProperty(exists.value(), ObjectPropertyDescriptorForDefineOwnProperty::AllPresent));
k++;
n++;
} else {
double tmp = Object::nextIndexForward(state, thisObject, k, len, false);
n += tmp - k;
k = tmp;
}
}
array->setLength(state, n);
return array;
}
void GlobalObject::installArray(ExecutionState& state)
{
m_array = new FunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().Array, builtinArrayConstructor, 1, [](ExecutionState& state, size_t argc, Value* argv) -> Object* {
@ -209,6 +237,8 @@ void GlobalObject::installArray(ExecutionState& state)
ObjectPropertyDescriptorForDefineOwnProperty(new FunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().join, builtinArrayJoin, 1, nullptr, NativeFunctionInfo::Strict)), (ObjectPropertyDescriptorForDefineOwnProperty::PresentAttribute)(ObjectPropertyDescriptorForDefineOwnProperty::WritablePresent | ObjectPropertyDescriptorForDefineOwnProperty::ConfigurablePresent)));
m_arrayPrototype->defineOwnPropertyThrowsException(state, ObjectPropertyName(state.context()->staticStrings().sort),
ObjectPropertyDescriptorForDefineOwnProperty(new FunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().sort, builtinArraySort, 1, nullptr, NativeFunctionInfo::Strict)), (ObjectPropertyDescriptorForDefineOwnProperty::PresentAttribute)(ObjectPropertyDescriptorForDefineOwnProperty::WritablePresent | ObjectPropertyDescriptorForDefineOwnProperty::ConfigurablePresent)));
m_arrayPrototype->defineOwnPropertyThrowsException(state, ObjectPropertyName(state.context()->staticStrings().slice),
ObjectPropertyDescriptorForDefineOwnProperty(new FunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().slice, builtinArraySlice, 2, nullptr, NativeFunctionInfo::Strict)), (ObjectPropertyDescriptorForDefineOwnProperty::PresentAttribute)(ObjectPropertyDescriptorForDefineOwnProperty::WritablePresent | ObjectPropertyDescriptorForDefineOwnProperty::ConfigurablePresent)));
m_arrayPrototype->defineOwnPropertyThrowsException(state, ObjectPropertyName(state.context()->staticStrings().toString),
ObjectPropertyDescriptorForDefineOwnProperty(new FunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().toString, builtinArrayToString, 0, nullptr, NativeFunctionInfo::Strict)), (ObjectPropertyDescriptorForDefineOwnProperty::PresentAttribute)(ObjectPropertyDescriptorForDefineOwnProperty::WritablePresent | ObjectPropertyDescriptorForDefineOwnProperty::ConfigurablePresent)));