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ladybird/Userland/Libraries/LibJS/Runtime/ObjectConstructor.h

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LibJS: Add a global "Object" constructor This patch adds an "Object" constructor to the global object. The only function it implements so far is Object.getPrototypeOf().
2020-03-28 17:23:54 +01:00
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
Everywhere: Use linusg@serenityos.org for my copyright headers
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* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
LibJS: Add a global "Object" constructor This patch adds an "Object" constructor to the global object. The only function it implements so far is Object.getPrototypeOf().
2020-03-28 17:23:54 +01:00
*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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* SPDX-License-Identifier: BSD-2-Clause
LibJS: Add a global "Object" constructor This patch adds an "Object" constructor to the global object. The only function it implements so far is Object.getPrototypeOf().
2020-03-28 17:23:54 +01:00
*/
#pragma once
#include <LibJS/Runtime/NativeFunction.h>
namespace JS {
class ObjectConstructor final : public NativeFunction {
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. :^)
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JS_OBJECT(ObjectConstructor, NativeFunction);
LibJS: Add a global "Object" constructor This patch adds an "Object" constructor to the global object. The only function it implements so far is Object.getPrototypeOf().
2020-03-28 17:23:54 +01:00
public:
LibJS: Move native objects towards two-pass construction To make sure that everything is set up correctly in objects before we start adding properties to them, we split cell allocation into 3 steps: 1. Allocate a cell of appropriate size from the Heap 2. Call the C++ constructor on the cell 3. Call initialize() on the constructed object The job of initialize() is to define all the initial properties. Doing it in a second pass guarantees that the Object has a valid Shape and can find its own GlobalObject.
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explicit ObjectConstructor(GlobalObject&);
LibJS: Simplify Cell::initialize() Remove the Interpreter& argument and pass only GlobalObject&. We can find everything we need via the global object anyway.
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virtual void initialize(GlobalObject&) override;
LibJS: Add a global "Object" constructor This patch adds an "Object" constructor to the global object. The only function it implements so far is Object.getPrototypeOf().
2020-03-28 17:23:54 +01:00
virtual ~ObjectConstructor() override;
LibJS: Convert NativeFunction::{call,construct}() to ThrowCompletionOr Both at the same time because many of them call construct() in call() and I'm not keen on adding a bunch of temporary plumbing to turn exceptions into throw completions. Also changes the return value of construct() to Object* instead of Value as it always needs to return an object; allowing an arbitrary Value is a massive foot gun.
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virtual ThrowCompletionOr<Value> call() override;
virtual ThrowCompletionOr<Object*> construct(FunctionObject& new_target) override;
LibJS: Add a global "Object" constructor This patch adds an "Object" constructor to the global object. The only function it implements so far is Object.getPrototypeOf().
2020-03-28 17:23:54 +01:00
private:
LibJS: Implement constructor/non-constructor function calls This adds Function::construct() for constructor function calls via `new` keyword. NativeFunction doesn't have constructor behaviour by default, ScriptFunction simply calls call() in construct()
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virtual bool has_constructor() const override { return true; }
LibJS: Rework how native functions are called to improve |this| value Native functions now only get the Interpreter& as an argument. They can then extract |this| along with any indexed arguments it wants from it. This forces functions that want |this| to actually deal with calling interpreter.this_value().to_object(), and dealing with the possibility of a non-object |this|. This is still not great but let's keep massaging it forward.
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LibJS: Convert ObjectConstructor to ThrowCompletionOr
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JS_DECLARE_NATIVE_FUNCTION(define_property);
JS_DECLARE_NATIVE_FUNCTION(define_properties);
JS_DECLARE_NATIVE_FUNCTION(is);
JS_DECLARE_NATIVE_FUNCTION(get_own_property_descriptor);
JS_DECLARE_NATIVE_FUNCTION(get_own_property_descriptors);
JS_DECLARE_NATIVE_FUNCTION(get_own_property_names);
JS_DECLARE_NATIVE_FUNCTION(get_own_property_symbols);
JS_DECLARE_NATIVE_FUNCTION(get_prototype_of);
JS_DECLARE_NATIVE_FUNCTION(set_prototype_of);
JS_DECLARE_NATIVE_FUNCTION(is_extensible);
JS_DECLARE_NATIVE_FUNCTION(is_frozen);
JS_DECLARE_NATIVE_FUNCTION(is_sealed);
JS_DECLARE_NATIVE_FUNCTION(prevent_extensions);
JS_DECLARE_NATIVE_FUNCTION(seal);
JS_DECLARE_NATIVE_FUNCTION(freeze);
JS_DECLARE_NATIVE_FUNCTION(from_entries);
JS_DECLARE_NATIVE_FUNCTION(keys);
JS_DECLARE_NATIVE_FUNCTION(values);
JS_DECLARE_NATIVE_FUNCTION(entries);
JS_DECLARE_NATIVE_FUNCTION(create);
JS_DECLARE_NATIVE_FUNCTION(has_own);
JS_DECLARE_NATIVE_FUNCTION(assign);
LibJS: Add a global "Object" constructor This patch adds an "Object" constructor to the global object. The only function it implements so far is Object.getPrototypeOf().
2020-03-28 17:23:54 +01:00
};
}
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