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112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@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/Forward.h>
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#include <AK/StringView.h>
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namespace regex {
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#define ENUMERATE_REGEX_TOKENS \
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__ENUMERATE_REGEX_TOKEN(Eof) \
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__ENUMERATE_REGEX_TOKEN(Char) \
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__ENUMERATE_REGEX_TOKEN(Circumflex) \
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__ENUMERATE_REGEX_TOKEN(Period) \
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__ENUMERATE_REGEX_TOKEN(LeftParen) \
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__ENUMERATE_REGEX_TOKEN(RightParen) \
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__ENUMERATE_REGEX_TOKEN(LeftCurly) \
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__ENUMERATE_REGEX_TOKEN(RightCurly) \
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__ENUMERATE_REGEX_TOKEN(LeftBracket) \
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__ENUMERATE_REGEX_TOKEN(RightBracket) \
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__ENUMERATE_REGEX_TOKEN(Asterisk) \
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__ENUMERATE_REGEX_TOKEN(EscapeSequence) \
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__ENUMERATE_REGEX_TOKEN(Dollar) \
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__ENUMERATE_REGEX_TOKEN(Pipe) \
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__ENUMERATE_REGEX_TOKEN(Plus) \
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__ENUMERATE_REGEX_TOKEN(Comma) \
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__ENUMERATE_REGEX_TOKEN(Slash) \
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__ENUMERATE_REGEX_TOKEN(EqualSign) \
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__ENUMERATE_REGEX_TOKEN(HyphenMinus) \
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__ENUMERATE_REGEX_TOKEN(Colon) \
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__ENUMERATE_REGEX_TOKEN(Questionmark)
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enum class TokenType {
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#define __ENUMERATE_REGEX_TOKEN(x) x,
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ENUMERATE_REGEX_TOKENS
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#undef __ENUMERATE_REGEX_TOKEN
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};
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class Token {
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public:
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Token() = default;
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Token(const TokenType type, const size_t start_position, const StringView value)
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: m_type(type)
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, m_position(start_position)
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, m_value(value)
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{
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}
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TokenType type() const { return m_type; }
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const StringView& value() const { return m_value; }
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size_t position() const { return m_position; }
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const char* name() const;
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static const char* name(const TokenType);
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private:
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TokenType m_type { TokenType::Eof };
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size_t m_position { 0 };
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StringView m_value { nullptr };
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};
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class Lexer {
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public:
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Lexer() = default;
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explicit Lexer(const StringView source);
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Token next();
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void reset();
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void back(size_t offset);
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void set_source(const StringView source) { m_source = source; }
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bool try_skip(char);
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char skip();
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StringView slice_back(size_t offset) const { return m_source.substring_view(m_position - offset - 1, offset); }
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private:
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ALWAYS_INLINE char peek(size_t offset = 0) const;
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ALWAYS_INLINE void consume();
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StringView m_source {};
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size_t m_position { 0 };
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size_t m_previous_position { 0 };
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Token m_current_token { TokenType::Eof, 0, StringView(nullptr) };
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int m_current_char { 0 };
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};
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}
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using regex::Lexer;
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