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/*
* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.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(const TokenType type, const size_t start_position, const StringView value)
: m_type(type)
, m_position(start_position)
, m_value(value)
{
}
TokenType type() const { return m_type; }
const StringView& value() const { return m_value; }
size_t position() const { return m_position; }
const char* name() const;
static const char* name(const TokenType);
private:
TokenType m_type { TokenType::Eof };
size_t m_position { 0 };
StringView m_value { nullptr };
};
class Lexer {
public:
Lexer() = default;
explicit Lexer(const StringView source);
Token next();
void reset();
void back(size_t offset);
void set_source(const StringView source) { m_source = source; }
bool try_skip(char);
char skip();
const auto& source() const { return m_source; }
private:
ALWAYS_INLINE char peek(size_t offset = 0) const;
ALWAYS_INLINE void consume();
StringView m_source {};
size_t m_position { 0 };
size_t m_previous_position { 0 };
Token m_current_token { TokenType::Eof, 0, StringView(nullptr) };
int m_current_char { 0 };
};
}
using regex::Lexer;
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