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fbc771efe9
While null StringViews are just as bad, these prevent the removal of StringView(char const*) as that constructor accepts a nullptr. No functional changes.
86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
/*
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* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Forward.h>
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#include <AK/GenericLexer.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(TokenType const type, size_t const start_position, StringView const 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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StringView value() const { return m_value; }
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size_t position() const { return m_position; }
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char const* name() const;
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static char const* name(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 {};
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};
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class Lexer : public GenericLexer {
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public:
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Lexer();
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explicit Lexer(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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char consume();
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void set_source(StringView const source) { m_input = source; }
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auto const& source() const { return m_input; }
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private:
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size_t m_previous_position { 0 };
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Token m_current_token { TokenType::Eof, 0, {} };
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};
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}
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using regex::Lexer;
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