f5476be702
I always tell people to start building things by working on the thing that seems the most interesting right now. The most interesting thing here was an AST + simple interpreter, so that's where we start! There is no lexer or parser yet, we build an AST directly and then execute it in the interpreter, producing a return value. This seems like the start of something interesting. :^)
72 lines
2.2 KiB
C++
72 lines
2.2 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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#include <LibJS/AST.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Object.h>
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#include <LibJS/Value.h>
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namespace JS {
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Interpreter::Interpreter()
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{
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m_global_object = new Object;
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}
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Interpreter::~Interpreter()
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{
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}
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Value Interpreter::run(const ScopeNode& scope_node)
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{
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enter_scope(scope_node);
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Value last_value = js_undefined();
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for (auto& node : scope_node.children()) {
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last_value = node.execute(*this);
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}
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exit_scope(scope_node);
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return last_value;
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}
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void Interpreter::enter_scope(const ScopeNode& scope_node)
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{
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m_scope_stack.append({ scope_node });
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}
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void Interpreter::exit_scope(const ScopeNode& scope_node)
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{
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ASSERT(&m_scope_stack.last().scope_node == &scope_node);
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m_scope_stack.take_last();
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}
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void Interpreter::do_return()
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{
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dbg() << "FIXME: Implement Interpreter::do_return()";
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}
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}
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