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LibJS: Add basic support for "with" statements

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with statements evaluate an expression and put the result of it at the
"front" of the scope chain. This is implemented by creating a WithScope
object and placing it in front of the VM's current call frame's scope.
This commit is contained in:
Andreas Kling 2020-11-28 16:14:26 +01:00
parent c3fe9b4df8
commit 9de6443ab7
4 changed files with 135 additions and 2 deletions
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50
Libraries/LibJS/Runtime/WithScope.h Normal file
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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* 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
#include <LibJS/Runtime/ScopeObject.h>
namespace JS {
class WithScope : public ScopeObject {
JS_OBJECT(WithScope, ScopeObject);
public:
WithScope(Object&, ScopeObject* parent_scope);
virtual Optional<Variable> get_from_scope(const FlyString&) const override;
virtual void put_to_scope(const FlyString&, Variable) override;
virtual bool has_this_binding() const override;
virtual Value get_this_binding(GlobalObject&) const override;
private:
virtual void visit_edges(Visitor&) override;
Object& m_object;
};
}