0b5d414eba
Under some circumstances we need to ignore unsupported preprocessor keywords instead of crashing the processing, for example during live parsing in HackStudio.
84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
/*
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* Copyright (c) 2021, Itamar S. <itamar8910@gmail.com>
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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/FlyString.h>
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#include <AK/HashMap.h>
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#include <AK/Optional.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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namespace Cpp {
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class Preprocessor {
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public:
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explicit Preprocessor(const String& filename, const StringView& program);
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const String& process();
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const String& processed_text();
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Vector<StringView> included_paths() const { return m_included_paths; }
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struct DefinedValue {
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Optional<StringView> value;
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FlyString filename;
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size_t line { 0 };
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size_t column { 0 };
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};
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using Definitions = HashMap<StringView, DefinedValue>;
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const Definitions& definitions() const { return m_definitions; }
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void set_ignore_unsupported_keywords(bool ignore) { m_options.ignore_unsupported_keywords = ignore; }
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private:
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void handle_preprocessor_line(const StringView&);
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Definitions m_definitions;
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const String m_filename;
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const StringView m_program;
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StringBuilder m_builder;
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Vector<StringView> m_lines;
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size_t m_line_index { 0 };
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size_t m_current_depth { 0 };
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Vector<size_t> m_depths_of_taken_branches;
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Vector<size_t> m_depths_of_not_taken_branches;
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enum class State {
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Normal,
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SkipIfBranch,
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SkipElseBranch
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};
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State m_state { State::Normal };
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Vector<StringView> m_included_paths;
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String m_processed_text;
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struct Options {
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bool ignore_unsupported_keywords { false };
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} m_options;
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};
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}
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