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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "IDLTypes.h"
#include "JSDOMBinding.h"
#include "JSDOMConvertBase.h"
#include "JSDOMConvertBufferSource.h"
#include "JSDOMConvertInterface.h"
#include "JSDOMConvertNull.h"
#include <JavaScriptCore/IteratorOperations.h>
#include <wtf/Variant.h>
namespace WebCore {
template<typename ReturnType, bool enabled>
struct ConditionalReturner;
template<typename ReturnType>
struct ConditionalReturner<ReturnType, true> {
template<typename T>
static Optional<ReturnType> get(T&& value)
{
return ReturnType(std::forward<T>(value));
}
};
template<typename ReturnType>
struct ConditionalReturner<ReturnType, false> {
template<typename T>
static Optional<ReturnType> get(T&&)
{
return WTF::nullopt;
}
};
template<typename ReturnType, typename T, bool enabled>
struct ConditionalConverter;
template<typename ReturnType, typename T>
struct ConditionalConverter<ReturnType, T, true> {
static Optional<ReturnType> convert(JSC::ExecState& state, JSC::JSValue value)
{
return ReturnType(Converter<T>::convert(state, value));
}
};
template<typename ReturnType, typename T>
struct ConditionalConverter<ReturnType, T, false> {
static Optional<ReturnType> convert(JSC::ExecState&, JSC::JSValue)
{
return WTF::nullopt;
}
};
template<typename ReturnType, typename T, bool enabled>
struct ConditionalSequenceConverter;
template<typename ReturnType, typename T>
struct ConditionalSequenceConverter<ReturnType, T, true> {
static Optional<ReturnType> convert(JSC::ExecState& state, JSC::JSObject* object, JSC::JSValue method)
{
return ReturnType(Converter<T>::convert(state, object, method));
}
};
template<typename ReturnType, typename T>
struct ConditionalSequenceConverter<ReturnType, T, false> {
static Optional<ReturnType> convert(JSC::ExecState&, JSC::JSObject*, JSC::JSValue)
{
return WTF::nullopt;
}
};
namespace Detail {
template<typename List, bool condition>
struct ConditionalFront;
template<typename List>
struct ConditionalFront<List, true> {
using type = brigand::front<List>;
};
template<typename List>
struct ConditionalFront<List, false> {
using type = void;
};
}
template<typename List, bool condition>
using ConditionalFront = typename Detail::ConditionalFront<List, condition>::type;
template<typename... T> struct Converter<IDLUnion<T...>> : DefaultConverter<IDLUnion<T...>> {
using Type = IDLUnion<T...>;
using TypeList = typename Type::TypeList;
using ReturnType = typename Type::ImplementationType;
using NumericTypeList = brigand::filter<TypeList, IsIDLNumber<brigand::_1>>;
static constexpr size_t numberOfNumericTypes = brigand::size<NumericTypeList>::value;
static_assert(numberOfNumericTypes == 0 || numberOfNumericTypes == 1, "There can be 0 or 1 numeric types in an IDLUnion.");
using NumericType = ConditionalFront<NumericTypeList, numberOfNumericTypes != 0>;
using StringTypeList = brigand::filter<TypeList, IsIDLStringOrEnumeration<brigand::_1>>;
static constexpr size_t numberOfStringTypes = brigand::size<StringTypeList>::value;
static_assert(numberOfStringTypes == 0 || numberOfStringTypes == 1, "There can be 0 or 1 string types in an IDLUnion.");
using StringType = ConditionalFront<StringTypeList, numberOfStringTypes != 0>;
using SequenceTypeList = brigand::filter<TypeList, IsIDLSequence<brigand::_1>>;
static constexpr size_t numberOfSequenceTypes = brigand::size<SequenceTypeList>::value;
static_assert(numberOfSequenceTypes == 0 || numberOfSequenceTypes == 1, "There can be 0 or 1 sequence types in an IDLUnion.");
using SequenceType = ConditionalFront<SequenceTypeList, numberOfSequenceTypes != 0>;
using FrozenArrayTypeList = brigand::filter<TypeList, IsIDLFrozenArray<brigand::_1>>;
static constexpr size_t numberOfFrozenArrayTypes = brigand::size<FrozenArrayTypeList>::value;
static_assert(numberOfFrozenArrayTypes == 0 || numberOfFrozenArrayTypes == 1, "There can be 0 or 1 FrozenArray types in an IDLUnion.");
using FrozenArrayType = ConditionalFront<FrozenArrayTypeList, numberOfFrozenArrayTypes != 0>;
using DictionaryTypeList = brigand::filter<TypeList, IsIDLDictionary<brigand::_1>>;
static constexpr size_t numberOfDictionaryTypes = brigand::size<DictionaryTypeList>::value;
static_assert(numberOfDictionaryTypes == 0 || numberOfDictionaryTypes == 1, "There can be 0 or 1 dictionary types in an IDLUnion.");
static constexpr bool hasDictionaryType = numberOfDictionaryTypes != 0;
using DictionaryType = ConditionalFront<DictionaryTypeList, hasDictionaryType>;
using RecordTypeList = brigand::filter<TypeList, IsIDLRecord<brigand::_1>>;
static constexpr size_t numberOfRecordTypes = brigand::size<RecordTypeList>::value;
static_assert(numberOfRecordTypes == 0 || numberOfRecordTypes == 1, "There can be 0 or 1 record types in an IDLUnion.");
static constexpr bool hasRecordType = numberOfRecordTypes != 0;
using RecordType = ConditionalFront<RecordTypeList, hasRecordType>;
using ObjectTypeList = brigand::filter<TypeList, std::is_same<IDLObject, brigand::_1>>;
static constexpr size_t numberOfObjectTypes = brigand::size<ObjectTypeList>::value;
static_assert(numberOfObjectTypes == 0 || numberOfObjectTypes == 1, "There can be 0 or 1 object types in an IDLUnion.");
static constexpr bool hasObjectType = numberOfObjectTypes != 0;
using ObjectType = ConditionalFront<ObjectTypeList, hasObjectType>;
static constexpr bool hasAnyObjectType = (numberOfSequenceTypes + numberOfFrozenArrayTypes + numberOfDictionaryTypes + numberOfRecordTypes + numberOfObjectTypes) > 0;
using InterfaceTypeList = brigand::filter<TypeList, IsIDLInterface<brigand::_1>>;
using TypedArrayTypeList = brigand::filter<TypeList, IsIDLTypedArray<brigand::_1>>;
static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
{
JSC::VM& vm = state.vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// 1. If the union type includes a nullable type and V is null or undefined, then return the IDL value null.
constexpr bool hasNullType = brigand::any<TypeList, std::is_same<IDLNull, brigand::_1>>::value;
if (hasNullType) {
if (value.isUndefinedOrNull())
return ConditionalConverter<ReturnType, IDLNull, hasNullType>::convert(state, value).value();
}
// 2. Let types be the flattened member types of the union type.
// NOTE: Union is expected to be pre-flattented.
// 3. If V is null or undefined then:
if (hasDictionaryType) {
if (value.isUndefinedOrNull()) {
// 1. If types includes a dictionary type, then return the result of converting V to that dictionary type.
return ConditionalConverter<ReturnType, DictionaryType, hasDictionaryType>::convert(state, value).value();
}
}
// 4. If V is a platform object, then:
// 1. If types includes an interface type that V implements, then return the IDL value that is a reference to the object V.
// 2. If types includes object, then return the IDL value that is a reference to the object V.
// (FIXME: Add support for object and step 4.2)
if (brigand::any<TypeList, IsIDLInterface<brigand::_1>>::value) {
Optional<ReturnType> returnValue;
brigand::for_each<InterfaceTypeList>([&](auto&& type) {
if (returnValue)
return;
using Type = typename WTF::RemoveCVAndReference<decltype(type)>::type::type;
using ImplementationType = typename Type::ImplementationType;
using RawType = typename Type::RawType;
auto castedValue = JSToWrappedOverloader<RawType>::toWrapped(state, value);
if (!castedValue)
return;
returnValue = ReturnType(ImplementationType(castedValue));
});
if (returnValue)
return WTFMove(returnValue.value());
}
// FIXME: Add support for steps 5 & 6.
//
// 5. If V is a DOMException platform object, then:
// 1. If types includes DOMException or Error, then return the result of converting V to that type.
// 2 If types includes object, then return the IDL value that is a reference to the object V.
//
// 6. If Type(V) is Object and V has an [[ErrorData]] internal slot), then:
// 1. If types includes Error, then return the result of converting V to Error.
// 2. If types includes object, then return the IDL value that is a reference to the object V.
// 7. If Type(V) is Object and V has an [[ArrayBufferData]] internal slot, then:
// 1. If types includes ArrayBuffer, then return the result of converting V to ArrayBuffer.
// 2. If types includes object, then return the IDL value that is a reference to the object V.
constexpr bool hasArrayBufferType = brigand::any<TypeList, std::is_same<IDLArrayBuffer, brigand::_1>>::value;
if (hasArrayBufferType || hasObjectType) {
auto arrayBuffer = JSC::JSArrayBuffer::toWrapped(vm, value);
if (arrayBuffer) {
if (hasArrayBufferType)
return ConditionalReturner<ReturnType, hasArrayBufferType>::get(WTFMove(arrayBuffer)).value();
return ConditionalConverter<ReturnType, ObjectType, hasObjectType>::convert(state, value).value();
}
}
constexpr bool hasArrayBufferViewType = brigand::any<TypeList, std::is_same<IDLArrayBufferView, brigand::_1>>::value;
if (hasArrayBufferViewType || hasObjectType) {
auto arrayBufferView = JSC::JSArrayBufferView::toWrapped(vm, value);
if (arrayBufferView) {
if (hasArrayBufferViewType)
return ConditionalReturner<ReturnType, hasArrayBufferViewType>::get(WTFMove(arrayBufferView)).value();
return ConditionalConverter<ReturnType, ObjectType, hasObjectType>::convert(state, value).value();
}
}
// 8. If Type(V) is Object and V has a [[DataView]] internal slot, then:
// 1. If types includes DataView, then return the result of converting V to DataView.
// 2. If types includes object, then return the IDL value that is a reference to the object V.
constexpr bool hasDataViewType = brigand::any<TypeList, std::is_same<IDLDataView, brigand::_1>>::value;
if (hasDataViewType || hasObjectType) {
auto dataView = JSC::JSDataView::toWrapped(vm, value);
if (dataView) {
if (hasDataViewType)
return ConditionalReturner<ReturnType, hasDataViewType>::get(WTFMove(dataView)).value();
return ConditionalConverter<ReturnType, ObjectType, hasObjectType>::convert(state, value).value();
}
}
// 9. If Type(V) is Object and V has a [[TypedArrayName]] internal slot, then:
// 1. If types includes a typed array type whose name is the value of V’s [[TypedArrayName]] internal slot, then return the result of converting V to that type.
// 2. If types includes object, then return the IDL value that is a reference to the object V.
// (FIXME: Add support for object and step 9.2)
constexpr bool hasTypedArrayType = brigand::any<TypeList, IsIDLTypedArray<brigand::_1>>::value;
if (hasTypedArrayType) {
Optional<ReturnType> returnValue;
brigand::for_each<TypedArrayTypeList>([&](auto&& type) {
if (returnValue)
return;
using Type = typename WTF::RemoveCVAndReference<decltype(type)>::type::type;
using ImplementationType = typename Type::ImplementationType;
using WrapperType = typename Converter<Type>::WrapperType;
auto castedValue = WrapperType::toWrapped(vm, value);
if (!castedValue)
return;
returnValue = ReturnType(ImplementationType(castedValue));
});
if (returnValue)
return WTFMove(returnValue.value());
}
// FIXME: Add support for step 10.
//
// 10. If IsCallable(V) is true, then:
// 1. If types includes a callback function type, then return the result of converting V to that callback function type.
// 2. If types includes object, then return the IDL value that is a reference to the object V.
// 11. If V is any kind of object, then:
if (hasAnyObjectType) {
if (value.isCell()) {
JSC::JSCell* cell = value.asCell();
if (cell->isObject()) {
auto object = asObject(value);
// 1. If types includes a sequence type, then:
// 1. Let method be the result of GetMethod(V, @@iterator).
// 2. ReturnIfAbrupt(method).
// 3. If method is not undefined, return the result of creating a
// sequence of that type from V and method.
constexpr bool hasSequenceType = numberOfSequenceTypes != 0;
if (hasSequenceType) {
auto method = JSC::iteratorMethod(state, object);
RETURN_IF_EXCEPTION(scope, ReturnType());
if (!method.isUndefined())
return ConditionalSequenceConverter<ReturnType, SequenceType, hasSequenceType>::convert(state, object, method).value();
}
// 2. If types includes a frozen array type, then:
// 1. Let method be the result of GetMethod(V, @@iterator).
// 2. ReturnIfAbrupt(method).
// 3. If method is not undefined, return the result of creating a
// frozen array of that type from V and method.
constexpr bool hasFrozenArrayType = numberOfFrozenArrayTypes != 0;
if (hasFrozenArrayType) {
auto method = JSC::iteratorMethod(state, object);
RETURN_IF_EXCEPTION(scope, ReturnType());
if (!method.isUndefined())
return ConditionalSequenceConverter<ReturnType, FrozenArrayType, hasFrozenArrayType>::convert(state, object, method).value();
}
// 3. If types includes a dictionary type, then return the result of
// converting V to that dictionary type.
if (hasDictionaryType)
return ConditionalConverter<ReturnType, DictionaryType, hasDictionaryType>::convert(state, value).value();
// 4. If types includes a record type, then return the result of converting V to that record type.
if (hasRecordType)
return ConditionalConverter<ReturnType, RecordType, hasRecordType>::convert(state, value).value();
// 5. If types includes a callback interface type, then return the result of converting V to that interface type.
// (FIXME: Add support for callback interface type and step 12.5)
// 6. If types includes object, then return the IDL value that is a reference to the object V.
if (hasObjectType)
return ConditionalConverter<ReturnType, ObjectType, hasObjectType>::convert(state, value).value();
}
}
}
// 12. If V is a Boolean value, then:
// 1. If types includes a boolean, then return the result of converting V to boolean.
constexpr bool hasBooleanType = brigand::any<TypeList, std::is_same<IDLBoolean, brigand::_1>>::value;
if (hasBooleanType) {
if (value.isBoolean())
return ConditionalConverter<ReturnType, IDLBoolean, hasBooleanType>::convert(state, value).value();
}
// 13. If V is a Number value, then:
// 1. If types includes a numeric type, then return the result of converting V to that numeric type.
constexpr bool hasNumericType = brigand::size<NumericTypeList>::value != 0;
if (hasNumericType) {
if (value.isNumber())
return ConditionalConverter<ReturnType, NumericType, hasNumericType>::convert(state, value).value();
}
// 14. If types includes a string type, then return the result of converting V to that type.
constexpr bool hasStringType = brigand::size<StringTypeList>::value != 0;
if (hasStringType)
return ConditionalConverter<ReturnType, StringType, hasStringType>::convert(state, value).value();
// 15. If types includes a numeric type, then return the result of converting V to that numeric type.
if (hasNumericType)
return ConditionalConverter<ReturnType, NumericType, hasNumericType>::convert(state, value).value();
// 16. If types includes a boolean, then return the result of converting V to boolean.
if (hasBooleanType)
return ConditionalConverter<ReturnType, IDLBoolean, hasBooleanType>::convert(state, value).value();
// 17. Throw a TypeError.
throwTypeError(&state, scope);
return ReturnType();
}
};
template<typename... T> struct JSConverter<IDLUnion<T...>> {
using Type = IDLUnion<T...>;
using TypeList = typename Type::TypeList;
using ImplementationType = typename Type::ImplementationType;
static constexpr bool needsState = true;
static constexpr bool needsGlobalObject = true;
using Sequence = brigand::make_sequence<brigand::ptrdiff_t<0>, WTF::variant_size<ImplementationType>::value>;
static JSC::JSValue convert(JSC::ExecState& state, JSDOMGlobalObject& globalObject, const ImplementationType& variant)
{
auto index = variant.index();
Optional<JSC::JSValue> returnValue;
brigand::for_each<Sequence>([&](auto&& type) {
using I = typename WTF::RemoveCVAndReference<decltype(type)>::type::type;
if (I::value == index) {
ASSERT(!returnValue);
returnValue = toJS<brigand::at<TypeList, I>>(state, globalObject, WTF::get<I::value>(variant));
}
});
ASSERT(returnValue);
return returnValue.value();
}
};
} // namespace WebCore