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LibJS: Implement Function.prototype.bind()
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10 changed files with 317 additions and 6 deletions
71
Libraries/LibJS/Runtime/BoundFunction.cpp
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71
Libraries/LibJS/Runtime/BoundFunction.cpp
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@ -0,0 +1,71 @@
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/*
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* Copyright (c) 2020, Jack Karamanian <karamanian.jack@gmail.com>
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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 <LibJS/Interpreter.h>
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#include <LibJS/Runtime/BoundFunction.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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BoundFunction::BoundFunction(Function& target_function, Value bound_this, Vector<Value> arguments, i32 length, Object* constructor_prototype)
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: Function::Function(*interpreter().global_object().function_prototype(), bound_this, move(arguments))
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, m_target_function(&target_function)
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, m_constructor_prototype(constructor_prototype)
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, m_name(String::format("bound %s", target_function.name().characters()))
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{
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put("length", Value(length));
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}
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BoundFunction::~BoundFunction()
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{
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}
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Value BoundFunction::call(Interpreter& interpreter)
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{
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return m_target_function->call(interpreter);
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}
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Value BoundFunction::construct(Interpreter& interpreter)
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{
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if (auto this_value = interpreter.this_value(); m_constructor_prototype && this_value.is_object()) {
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this_value.as_object().set_prototype(m_constructor_prototype);
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}
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return m_target_function->construct(interpreter);
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}
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LexicalEnvironment* BoundFunction::create_environment()
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{
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return m_target_function->create_environment();
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}
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void BoundFunction::visit_children(Visitor& visitor)
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{
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Function::visit_children(visitor);
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visitor.visit(m_target_function);
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visitor.visit(m_constructor_prototype);
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}
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}
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66
Libraries/LibJS/Runtime/BoundFunction.h
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66
Libraries/LibJS/Runtime/BoundFunction.h
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@ -0,0 +1,66 @@
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/*
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* Copyright (c) 2020, Jack Karamanian <karamanian.jack@gmail.com>
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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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#pragma once
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#include <LibJS/Runtime/Function.h>
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namespace JS {
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class BoundFunction final : public Function {
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public:
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BoundFunction(Function& target_function, Value bound_this, Vector<Value> arguments, i32 length, Object* constructor_prototype);
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virtual ~BoundFunction();
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virtual Value call(Interpreter& interpreter) override;
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virtual Value construct(Interpreter& interpreter) override;
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virtual LexicalEnvironment* create_environment() override;
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virtual void visit_children(Visitor&) override;
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virtual const FlyString& name() const override
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{
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return m_name;
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}
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Function& target_function() const
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{
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return *m_target_function;
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}
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private:
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virtual bool is_bound_function() const override { return true; }
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virtual const char* class_name() const override { return "BoundFunction"; }
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Function* m_target_function = nullptr;
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Object* m_constructor_prototype = nullptr;
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FlyString m_name;
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};
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}
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@ -25,7 +25,9 @@
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*/
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/BoundFunction.h>
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#include <LibJS/Runtime/Function.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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@ -41,6 +43,50 @@ Function::Function(Object& prototype, Optional<Value> bound_this, Vector<Value>
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{
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}
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BoundFunction* Function::bind(Value bound_this_value, Vector<Value> arguments)
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{
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Function& target_function = is_bound_function() ? static_cast<BoundFunction&>(*this).target_function() : *this;
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auto bound_this_object
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= [bound_this_value, this]() -> Value {
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if (bound_this().has_value()) {
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return bound_this().value();
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}
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switch (bound_this_value.type()) {
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case Value::Type::Undefined:
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case Value::Type::Null:
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// FIXME: Null or undefined should be passed through in strict mode.
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return &interpreter().global_object();
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default:
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return bound_this_value.to_object(interpreter().heap());
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}
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}();
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i32 computed_length = 0;
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auto length_property = get("length");
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if (interpreter().exception()) {
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return nullptr;
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}
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if (length_property.has_value() && length_property.value().is_number()) {
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computed_length = max(0, length_property.value().to_i32() - static_cast<i32>(arguments.size()));
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}
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Object* constructor_prototype = nullptr;
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auto prototype_property = target_function.get("prototype");
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if (interpreter().exception()) {
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return nullptr;
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}
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if (prototype_property.has_value() && prototype_property.value().is_object()) {
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constructor_prototype = &prototype_property.value().as_object();
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}
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auto all_bound_arguments = bound_arguments();
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all_bound_arguments.append(move(arguments));
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return interpreter().heap().allocate<BoundFunction>(target_function, bound_this_object, move(all_bound_arguments), computed_length, constructor_prototype);
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}
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void Function::visit_children(Visitor& visitor)
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{
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Object::visit_children(visitor);
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@ -42,6 +42,8 @@ public:
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virtual void visit_children(Visitor&) override;
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BoundFunction* bind(Value bound_this_value, Vector<Value> arguments);
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Optional<Value> bound_this() const
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{
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return m_bound_this;
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@ -28,6 +28,7 @@
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#include <AK/StringBuilder.h>
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#include <LibJS/AST.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/BoundFunction.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/FunctionPrototype.h>
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@ -84,8 +85,19 @@ Value FunctionPrototype::bind(Interpreter& interpreter)
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auto* this_object = interpreter.this_value().to_object(interpreter.heap());
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if (!this_object)
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return {};
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// FIXME: Implement me :^)
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ASSERT_NOT_REACHED();
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if (!this_object->is_function())
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return interpreter.throw_exception<TypeError>("Not a Function object");
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auto& this_function = static_cast<Function&>(*this_object);
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auto bound_this_arg = interpreter.argument(0);
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Vector<Value> arguments;
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if (interpreter.argument_count() > 1) {
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arguments = interpreter.call_frame().arguments;
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arguments.remove(0);
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}
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return this_function.bind(bound_this_arg, move(arguments));
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}
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Value FunctionPrototype::call(Interpreter& interpreter)
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String function_parameters = "";
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String function_body;
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if (this_object->is_native_function()) {
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if (this_object->is_native_function() || this_object->is_bound_function()) {
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function_body = String::format(" [%s]", this_object->class_name());
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} else {
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auto& parameters = static_cast<ScriptFunction*>(this_object)->parameters();
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@ -72,6 +72,7 @@ public:
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virtual bool is_error() const { return false; }
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virtual bool is_function() const { return false; }
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virtual bool is_native_function() const { return false; }
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virtual bool is_bound_function() const { return false; }
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virtual bool is_native_property() const { return false; }
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virtual bool is_string_object() const { return false; }
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