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LibCpp: Start working on a C preprocessor

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We currently handle basic #define statements as well as ifdef and else
branches.
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Itamar 2021-02-06 15:51:04 +02:00 • committed by Andreas Kling
parent 2d2b3ba5ed
commit bed3261723
5 changed files with 283 additions and 0 deletions
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Userland/Libraries/LibCpp/Preprocessor.h Normal file
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/*
* Copyright (c) 2021, Itamar S. <itamar8910@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
#include <AK/HashMap.h>
#include <AK/Optional.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <AK/Vector.h>
namespace Cpp {
class Preprocessor {
public:
explicit Preprocessor(const StringView&);
const String& process();
const String& processed_text();
Vector<StringView> included_paths() const { return m_included_paths; }
private:
struct DefinedValue {
Optional<StringView> value;
};
void handle_preprocessor_line(const StringView&);
HashMap<StringView, DefinedValue> m_definitions;
const StringView m_program;
StringBuilder m_builder;
Vector<StringView> m_lines;
size_t m_line_index { 0 };
size_t m_current_depth { 0 };
Vector<size_t> m_depths_of_taken_branches;
Vector<size_t> m_depths_of_not_taken_branches;
enum class State {
Normal,
SkipIfBranch,
SkipElseBranch
};
State m_state { State::Normal };
Vector<StringView> m_included_paths;
String m_processed_text;
};
}