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https://github.com/RGBCube/serenity
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df40c85f80
Previously, we were assuming all declared variables were bound to a block scope, now, with the addition of declaration types, we can bind a variable to a block scope using `let`, or a function scope (the scope of the inner-most enclosing function of a `var` declaration) using `var`.
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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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 <AK/HashMap.h>
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#include <AK/Vector.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Heap.h>
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namespace JS {
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enum class ScopeType {
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Function,
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Block,
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};
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struct ScopeFrame {
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ScopeType type;
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const ScopeNode& scope_node;
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HashMap<String, Value> variables;
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};
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class Interpreter {
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public:
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Interpreter();
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~Interpreter();
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Value run(const ScopeNode&, ScopeType = ScopeType::Block);
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Object& global_object() { return *m_global_object; }
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const Object& global_object() const { return *m_global_object; }
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Heap& heap() { return m_heap; }
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void do_return();
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Value get_variable(const String& name);
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void set_variable(String name, Value);
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void declare_variable(String name, DeclarationType);
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void collect_roots(Badge<Heap>, HashTable<Cell*>&);
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private:
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void enter_scope(const ScopeNode&, ScopeType);
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void exit_scope(const ScopeNode&);
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Heap m_heap;
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Vector<ScopeFrame> m_scope_stack;
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Object* m_global_object { nullptr };
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};
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}
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