251 lines
9.5 KiB
C++
251 lines
9.5 KiB
C++
/*
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* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Function.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/Function.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/ReflectObject.h>
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namespace JS {
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static Object* get_target_object_from(Interpreter& interpreter, const String& name)
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{
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auto target = interpreter.argument(0);
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if (!target.is_object()) {
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interpreter.throw_exception<TypeError>(String::format("First argument of Reflect.%s() must be an object", name.characters()));
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return nullptr;
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}
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return static_cast<Object*>(&target.as_object());
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}
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static Function* get_target_function_from(Interpreter& interpreter, const String& name)
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{
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auto target = interpreter.argument(0);
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if (!target.is_object() || !target.as_object().is_function()) {
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interpreter.throw_exception<TypeError>(String::format("First argument of Reflect.%s() must be a function", name.characters()));
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return nullptr;
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}
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return static_cast<Function*>(&target.as_object());
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}
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static void prepare_arguments_list(Interpreter& interpreter, Value value, MarkedValueList* arguments)
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{
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if (!value.is_object()) {
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interpreter.throw_exception<TypeError>("Arguments list must be an object");
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return;
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}
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auto& arguments_list = value.as_object();
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auto length_property = arguments_list.get("length");
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if (interpreter.exception())
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return;
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auto length = length_property.to_size_t();
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for (size_t i = 0; i < length; ++i) {
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auto element = arguments_list.get(String::number(i));
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if (interpreter.exception())
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return;
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arguments->append(element.value_or(js_undefined()));
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}
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}
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ReflectObject::ReflectObject()
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: Object(interpreter().global_object().object_prototype())
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{
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u8 attr = Attribute::Writable | Attribute::Configurable;
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put_native_function("apply", apply, 3, attr);
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put_native_function("construct", construct, 2, attr);
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put_native_function("defineProperty", define_property, 3, attr);
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put_native_function("deleteProperty", delete_property, 2, attr);
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put_native_function("get", get, 2, attr);
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put_native_function("getOwnPropertyDescriptor", get_own_property_descriptor, 2, attr);
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put_native_function("getPrototypeOf", get_prototype_of, 1, attr);
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put_native_function("has", has, 2, attr);
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put_native_function("isExtensible", is_extensible, 1, attr);
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put_native_function("ownKeys", own_keys, 1, attr);
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put_native_function("preventExtensions", prevent_extensions, 1, attr);
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put_native_function("set", set, 3, attr);
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put_native_function("setPrototypeOf", set_prototype_of, 2, attr);
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}
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ReflectObject::~ReflectObject()
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{
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}
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Value ReflectObject::apply(Interpreter& interpreter)
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{
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auto* target = get_target_function_from(interpreter, "apply");
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if (!target)
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return {};
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auto this_arg = interpreter.argument(1);
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MarkedValueList arguments(interpreter.heap());
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prepare_arguments_list(interpreter, interpreter.argument(2), &arguments);
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if (interpreter.exception())
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return {};
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return interpreter.call(*target, this_arg, move(arguments));
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}
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Value ReflectObject::construct(Interpreter& interpreter)
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{
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auto* target = get_target_function_from(interpreter, "construct");
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if (!target)
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return {};
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MarkedValueList arguments(interpreter.heap());
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prepare_arguments_list(interpreter, interpreter.argument(1), &arguments);
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if (interpreter.exception())
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return {};
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auto* new_target = target;
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if (interpreter.argument_count() > 2) {
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auto new_target_value = interpreter.argument(2);
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if (!new_target_value.is_object()
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|| !new_target_value.as_object().is_function()
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|| (new_target_value.as_object().is_native_function() && !static_cast<NativeFunction&>(new_target_value.as_object()).has_constructor())) {
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interpreter.throw_exception<TypeError>("Optional third argument of Reflect.construct() must be a constructor");
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return {};
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}
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new_target = static_cast<Function*>(&new_target_value.as_object());
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}
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return interpreter.construct(*target, *new_target, move(arguments));
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}
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Value ReflectObject::define_property(Interpreter& interpreter)
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{
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auto* target = get_target_object_from(interpreter, "defineProperty");
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if (!target)
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return {};
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if (!interpreter.argument(2).is_object())
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return interpreter.throw_exception<TypeError>("Descriptor argument is not an object");
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auto property_key = interpreter.argument(1).to_string();
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auto& descriptor = interpreter.argument(2).as_object();
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auto success = target->define_property(property_key, descriptor, false);
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return Value(success);
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}
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Value ReflectObject::delete_property(Interpreter& interpreter)
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{
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auto* target = get_target_object_from(interpreter, "deleteProperty");
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if (!target)
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return {};
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auto property_key = interpreter.argument(1);
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PropertyName property = PropertyName(property_key.to_string());
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if (property_key.to_number().is_finite_number()) {
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auto property_key_as_double = property_key.to_double();
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if (property_key_as_double >= 0 && (i32)property_key_as_double == property_key_as_double)
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property = PropertyName(property_key_as_double);
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}
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return target->delete_property(property);
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}
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Value ReflectObject::get(Interpreter& interpreter)
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{
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// FIXME: There's a third argument, receiver, for getters - use it once we have those.
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auto* target = get_target_object_from(interpreter, "get");
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if (!target)
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return {};
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auto property_key = interpreter.argument(1).to_string();
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return target->get(property_key).value_or(js_undefined());
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}
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Value ReflectObject::get_own_property_descriptor(Interpreter& interpreter)
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{
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auto* target = get_target_object_from(interpreter, "getOwnPropertyDescriptor");
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if (!target)
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return {};
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auto property_key = interpreter.argument(1).to_string();
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return target->get_own_property_descriptor(property_key);
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}
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Value ReflectObject::get_prototype_of(Interpreter& interpreter)
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{
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auto* target = get_target_object_from(interpreter, "getPrototypeOf");
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if (!target)
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return {};
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return target->prototype();
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}
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Value ReflectObject::has(Interpreter& interpreter)
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{
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auto* target = get_target_object_from(interpreter, "has");
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if (!target)
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return {};
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auto property_key = interpreter.argument(1).to_string();
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return Value(target->has_property(property_key));
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}
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Value ReflectObject::is_extensible(Interpreter&)
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{
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// FIXME: For this to be useful we need one of these:
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// Object.seal(), Object.freeze(), Reflect.preventExtensions()
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// For now we just return true, as that's always the case.
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return Value(true);
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}
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Value ReflectObject::own_keys(Interpreter& interpreter)
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{
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auto* target = get_target_object_from(interpreter, "ownKeys");
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if (!target)
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return {};
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return target->get_own_properties(*target, GetOwnPropertyMode::Key);
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}
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Value ReflectObject::prevent_extensions(Interpreter&)
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{
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// FIXME: Implement me :^)
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ASSERT_NOT_REACHED();
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}
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Value ReflectObject::set(Interpreter& interpreter)
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{
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// FIXME: There's a fourth argument, receiver, for setters - use it once we have those.
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auto* target = get_target_object_from(interpreter, "set");
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if (!target)
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return {};
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auto property_key = interpreter.argument(1).to_string();
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auto value = interpreter.argument(2);
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return Value(target->put(property_key, value));
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}
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Value ReflectObject::set_prototype_of(Interpreter& interpreter)
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{
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auto* target = get_target_object_from(interpreter, "setPrototypeOf");
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if (!target)
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return {};
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auto prototype_value = interpreter.argument(1);
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if (!prototype_value.is_object() && !prototype_value.is_null()) {
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interpreter.throw_exception<TypeError>("Prototype must be an object or null");
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return {};
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}
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Object* prototype = nullptr;
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if (!prototype_value.is_null())
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prototype = const_cast<Object*>(&prototype_value.as_object());
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target->set_prototype(prototype);
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// FIXME: Needs to return false for prototype chain cycles and non-extensible objects (don't have those yet).
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return Value(true);
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}
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}
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