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ladybird/Libraries/LibJS/Runtime/ProxyObject.h

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LibJS: Add Proxy objects Includes all traps except the following: [[Call]], [[Construct]], [[OwnPropertyKeys]]. An important implication of this commit is that any call to any virtual Object method has the potential to throw an exception. These methods were not checked in this commit -- a future commit will have to protect these various method calls throughout the codebase.
2020-06-03 14:34:52 -07:00
/*
* Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
* 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT HOLDER OR 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
LibJS: Implement Proxy [[Call]] and [[Construct]] traps In order to do this, Proxy now extends Function rather than Object, and whether or not it returns true for is_function() depends on it's m_target.
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#include <LibJS/Runtime/Function.h>
LibJS: Add Proxy objects Includes all traps except the following: [[Call]], [[Construct]], [[OwnPropertyKeys]]. An important implication of this commit is that any call to any virtual Object method has the potential to throw an exception. These methods were not checked in this commit -- a future commit will have to protect these various method calls throughout the codebase.
2020-06-03 14:34:52 -07:00
namespace JS {
LibJS: Implement Proxy [[Call]] and [[Construct]] traps In order to do this, Proxy now extends Function rather than Object, and whether or not it returns true for is_function() depends on it's m_target.
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class ProxyObject final : public Function {
JS_OBJECT(ProxyObject, Function);
LibJS+LibWeb: Add JS::Object::inherits(class_name) To allow implementing the DOM class hierarchy in JS bindings, this patch adds an inherits() function that can be used to ask an Object if it inherits from a specific C++ class (by name). The necessary overrides are baked into each Object subclass by the new JS_OBJECT macro, which works similarly to C_OBJECT in LibCore. Thanks to @Dexesttp for suggesting this approach. :^)
2020-06-21 15:14:02 +02:00
LibJS: Add Proxy objects Includes all traps except the following: [[Call]], [[Construct]], [[OwnPropertyKeys]]. An important implication of this commit is that any call to any virtual Object method has the potential to throw an exception. These methods were not checked in this commit -- a future commit will have to protect these various method calls throughout the codebase.
2020-06-03 14:34:52 -07:00
public:
static ProxyObject* create(GlobalObject&, Object& target, Object& handler);
ProxyObject(Object& target, Object& handler, Object& prototype);
virtual ~ProxyObject() override;
LibJS: Make Function::call() not require an Interpreter& This makes a difference inside ScriptFunction::call(), which will now instantiate a temporary Interpreter if one is not attached to the VM.
2020-09-27 17:24:14 +02:00
virtual Value call() override;
LibJS: Explicitly pass a "Function& new_target" to Function::construct This allows the proxy handler to pass the proper new.target to construct handlers.
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virtual Value construct(Interpreter&, Function& new_target) override;
LibJS: Implement Proxy [[Call]] and [[Construct]] traps In order to do this, Proxy now extends Function rather than Object, and whether or not it returns true for is_function() depends on it's m_target.
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virtual const FlyString& name() const override;
virtual LexicalEnvironment* create_environment() override;
LibJS: Add Proxy objects Includes all traps except the following: [[Call]], [[Construct]], [[OwnPropertyKeys]]. An important implication of this commit is that any call to any virtual Object method has the potential to throw an exception. These methods were not checked in this commit -- a future commit will have to protect these various method calls throughout the codebase.
2020-06-03 14:34:52 -07:00
const Object& target() const { return m_target; }
const Object& handler() const { return m_handler; }
virtual Object* prototype() override;
virtual const Object* prototype() const override;
virtual bool set_prototype(Object* object) override;
virtual bool is_extensible() const override;
virtual bool prevent_extensions() override;
LibJS: Integrate Symbols into objects as valid keys This allows objects properties to be created for symbol keys in addition to just plain strings/numbers
2020-07-07 21:38:46 -07:00
virtual Optional<PropertyDescriptor> get_own_property_descriptor(const PropertyName&) const override;
virtual bool define_property(const StringOrSymbol& property_name, const Object& descriptor, bool throw_exceptions = true) override;
virtual bool has_property(const PropertyName& name) const override;
virtual Value get(const PropertyName& name, Value receiver) const override;
virtual bool put(const PropertyName& name, Value value, Value receiver) override;
virtual Value delete_property(const PropertyName& name) override;
LibJS: Add Proxy objects Includes all traps except the following: [[Call]], [[Construct]], [[OwnPropertyKeys]]. An important implication of this commit is that any call to any virtual Object method has the potential to throw an exception. These methods were not checked in this commit -- a future commit will have to protect these various method calls throughout the codebase.
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void revoke() { m_is_revoked = true; }
private:
virtual void visit_children(Visitor&) override;
virtual bool is_proxy_object() const override { return true; }
LibJS: Implement Proxy [[Call]] and [[Construct]] traps In order to do this, Proxy now extends Function rather than Object, and whether or not it returns true for is_function() depends on it's m_target.
2020-06-25 14:49:56 -07:00
LibJS: Implement spec-compliant Object.prototype.toString
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virtual bool is_function() const override { return m_target.is_function(); }
LibJS: Add JSON.stringify
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virtual bool is_array() const override { return m_target.is_array(); };
LibJS: Add Proxy objects Includes all traps except the following: [[Call]], [[Construct]], [[OwnPropertyKeys]]. An important implication of this commit is that any call to any virtual Object method has the potential to throw an exception. These methods were not checked in this commit -- a future commit will have to protect these various method calls throughout the codebase.
2020-06-03 14:34:52 -07:00
Object& m_target;
Object& m_handler;
bool m_is_revoked { false };
};
}
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