mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-10 13:00:29 +03:00
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++
/*
|
|
* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Forward.h>
|
|
#include <AK/GenericLexer.h>
|
|
#include <AK/StringView.h>
|
|
|
|
namespace regex {
|
|
|
|
#define ENUMERATE_REGEX_TOKENS \
|
|
__ENUMERATE_REGEX_TOKEN(Eof) \
|
|
__ENUMERATE_REGEX_TOKEN(Char) \
|
|
__ENUMERATE_REGEX_TOKEN(Circumflex) \
|
|
__ENUMERATE_REGEX_TOKEN(Period) \
|
|
__ENUMERATE_REGEX_TOKEN(LeftParen) \
|
|
__ENUMERATE_REGEX_TOKEN(RightParen) \
|
|
__ENUMERATE_REGEX_TOKEN(LeftCurly) \
|
|
__ENUMERATE_REGEX_TOKEN(RightCurly) \
|
|
__ENUMERATE_REGEX_TOKEN(LeftBracket) \
|
|
__ENUMERATE_REGEX_TOKEN(RightBracket) \
|
|
__ENUMERATE_REGEX_TOKEN(Asterisk) \
|
|
__ENUMERATE_REGEX_TOKEN(EscapeSequence) \
|
|
__ENUMERATE_REGEX_TOKEN(Dollar) \
|
|
__ENUMERATE_REGEX_TOKEN(Pipe) \
|
|
__ENUMERATE_REGEX_TOKEN(Plus) \
|
|
__ENUMERATE_REGEX_TOKEN(Comma) \
|
|
__ENUMERATE_REGEX_TOKEN(Slash) \
|
|
__ENUMERATE_REGEX_TOKEN(EqualSign) \
|
|
__ENUMERATE_REGEX_TOKEN(HyphenMinus) \
|
|
__ENUMERATE_REGEX_TOKEN(Colon) \
|
|
__ENUMERATE_REGEX_TOKEN(Questionmark)
|
|
|
|
enum class TokenType {
|
|
#define __ENUMERATE_REGEX_TOKEN(x) x,
|
|
ENUMERATE_REGEX_TOKENS
|
|
#undef __ENUMERATE_REGEX_TOKEN
|
|
};
|
|
|
|
class Token {
|
|
public:
|
|
Token() = default;
|
|
Token(TokenType const type, size_t const start_position, StringView const value)
|
|
: m_type(type)
|
|
, m_position(start_position)
|
|
, m_value(value)
|
|
{
|
|
}
|
|
|
|
TokenType type() const { return m_type; }
|
|
StringView value() const { return m_value; }
|
|
size_t position() const { return m_position; }
|
|
|
|
char const* name() const;
|
|
static char const* name(TokenType);
|
|
|
|
private:
|
|
TokenType m_type { TokenType::Eof };
|
|
size_t m_position { 0 };
|
|
StringView m_value {};
|
|
};
|
|
|
|
class Lexer : public GenericLexer {
|
|
public:
|
|
Lexer();
|
|
explicit Lexer(StringView source);
|
|
Token next();
|
|
void reset();
|
|
void back(size_t offset);
|
|
char consume();
|
|
void set_source(StringView const source) { m_input = source; }
|
|
auto const& source() const { return m_input; }
|
|
|
|
private:
|
|
size_t m_previous_position { 0 };
|
|
Token m_current_token { TokenType::Eof, 0, {} };
|
|
};
|
|
|
|
}
|
|
|
|
using regex::Lexer;
|