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/*
* Copyright (C) 2016-2019 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 "JSDOMConvertStrings.h"
#include "JSDOMGlobalObject.h"
#include <JavaScriptCore/ObjectConstructor.h>
namespace WebCore {
namespace Detail {
template<typename IDLStringType>
struct IdentifierConverter;
template<> struct IdentifierConverter<IDLDOMString> {
static String convert(JSC::JSGlobalObject& lexicalGlobalObject, const JSC::Identifier& identifier)
{
return identifierToString(lexicalGlobalObject, identifier);
}
};
template<> struct IdentifierConverter<IDLByteString> {
static String convert(JSC::JSGlobalObject& lexicalGlobalObject, const JSC::Identifier& identifier)
{
return identifierToByteString(lexicalGlobalObject, identifier);
}
};
template<> struct IdentifierConverter<IDLUSVString> {
static String convert(JSC::JSGlobalObject& lexicalGlobalObject, const JSC::Identifier& identifier)
{
return identifierToUSVString(lexicalGlobalObject, identifier);
}
};
}
template<typename K, typename V> struct Converter<IDLRecord<K, V>> : DefaultConverter<IDLRecord<K, V>> {
using ReturnType = typename DefaultConverter<IDLRecord<K, V>>::ReturnType;
using KeyType = typename K::InnerParameterType;
using ValueType = typename V::InnerParameterType;
using Result = ConversionResult<IDLRecord<K, V>>;
static Result convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSDOMGlobalObject& globalObject)
{
return convertRecord(lexicalGlobalObject, value, globalObject);
}
static Result convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
{
return convertRecord(lexicalGlobalObject, value);
}
private:
// As temporary measure, IDL interfaces need to have their conversion result adjusted
// to properly form an inner parameter type. Once all IDL types have full support for
// using Ref for interfaces, this adjustment can be removed.
template<typename IDL>
struct ValueAdjuster {
static ValueType adjust(ConversionResult<IDL>&& result)
{
return result.releaseReturnValue();
}
};
template<typename T>
struct ValueAdjuster<IDLInterface<T>> {
static ValueType adjust(ConversionResult<IDLInterface<T>>&& result)
{
return Ref { *result.releaseReturnValue() };
}
};
template<class... Args>
static Result convertRecord(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, Args&& ...args)
{
auto& vm = JSC::getVM(&lexicalGlobalObject);
auto scope = DECLARE_THROW_SCOPE(vm);
// 1. Let result be a new empty instance of record<K, V>.
// 2. If Type(O) is Undefined or Null, return result.
if (value.isUndefinedOrNull())
return ReturnType { };
// 3. If Type(O) is not Object, throw a TypeError.
if (!value.isObject()) {
throwTypeError(&lexicalGlobalObject, scope);
return Result::exception();
}
JSC::JSObject* object = JSC::asObject(value);
ReturnType result;
UncheckedKeyHashMap<KeyType, size_t> resultMap;
// 4. Let keys be ? O.[[OwnPropertyKeys]]().
JSC::PropertyNameArray keys(vm, JSC::PropertyNameMode::StringsAndSymbols, JSC::PrivateSymbolMode::Exclude);
object->methodTable()->getOwnPropertyNames(object, &lexicalGlobalObject, keys, JSC::DontEnumPropertiesMode::Include);
RETURN_IF_EXCEPTION(scope, Result::exception());
// 5. Repeat, for each element key of keys in List order:
for (auto& key : keys) {
// 1. Let desc be ? O.[[GetOwnProperty]](key).
JSC::PropertySlot slot(object, JSC::PropertySlot::InternalMethodType::GetOwnProperty);
bool hasProperty = object->methodTable()->getOwnPropertySlot(object, &lexicalGlobalObject, key, slot);
RETURN_IF_EXCEPTION(scope, Result::exception());
// 2. If desc is not undefined and desc.[[Enumerable]] is true:
// It's necessary to filter enumerable here rather than using DontEnumPropertiesMode::Exclude,
// to prevent an observable extra [[GetOwnProperty]] operation in the case of ProxyObject records.
if (hasProperty && !(slot.attributes() & JSC::PropertyAttribute::DontEnum)) {
// 1. Let typedKey be key converted to an IDL value of type K.
auto typedKey = Detail::IdentifierConverter<K>::convert(lexicalGlobalObject, key);
RETURN_IF_EXCEPTION(scope, Result::exception());
// 2. Let value be ? Get(O, key).
JSC::JSValue subValue;
if (LIKELY(!slot.isTaintedByOpaqueObject()))
subValue = slot.getValue(&lexicalGlobalObject, key);
else
subValue = object->get(&lexicalGlobalObject, key);
RETURN_IF_EXCEPTION(scope, Result::exception());
// 3. Let typedValue be value converted to an IDL value of type V.
auto typedValue = WebCore::convert<V>(lexicalGlobalObject, subValue, args...);
if (UNLIKELY(typedValue.hasException(scope)))
return Result::exception();
// 4. Set result[typedKey] to typedValue.
// Note: It's possible that typedKey is already in result if K is USVString and key contains unpaired surrogates.
if constexpr (std::is_same_v<K, IDLUSVString>) {
if (!typedKey.is8Bit()) {
auto addResult = resultMap.add(typedKey, result.size());
if (!addResult.isNewEntry) {
ASSERT(result[addResult.iterator->value].key == typedKey);
result[addResult.iterator->value].value = ValueAdjuster<V>::adjust(WTFMove(typedValue));
continue;
}
}
} else
UNUSED_VARIABLE(resultMap);
// 5. Otherwise, append to result a mapping (typedKey, typedValue).
result.append({ WTFMove(typedKey), ValueAdjuster<V>::adjust(WTFMove(typedValue)) });
}
}
// 6. Return result.
return result;
}
};
template<typename K, typename V> struct JSConverter<IDLRecord<K, V>> {
static constexpr bool needsState = true;
static constexpr bool needsGlobalObject = true;
template<typename MapType>
static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, const MapType& map)
{
auto& vm = JSC::getVM(&lexicalGlobalObject);
// 1. Let result be ! ObjectCreate(%ObjectPrototype%).
auto result = constructEmptyObject(&lexicalGlobalObject, globalObject.objectPrototype());
// 2. Repeat, for each mapping (key, value) in D:
for (const auto& keyValuePair : map) {
// 1. Let esKey be key converted to an ECMAScript value.
// Note, this step is not required, as we need the key to be
// an Identifier, not a JSValue.
// 2. Let esValue be value converted to an ECMAScript value.
auto esValue = toJS<V>(lexicalGlobalObject, globalObject, keyValuePair.value);
// 3. Let created be ! CreateDataProperty(result, esKey, esValue).
bool created = result->createDataProperty(&lexicalGlobalObject, JSC::Identifier::fromString(vm, keyValuePair.key), esValue, true);
// 4. Assert: created is true.
ASSERT_UNUSED(created, created);
}
// 3. Return result.
return result;
}
};
} // namespace WebCore
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