mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 02:12:45 +00:00
11405c5139
- initializing m_line_column to 1 in the lexer results in incorrect column values in tokens on the first line of input. - not incrementing m_line_column when EOF is reached results in an incorrect column value on the last token.
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
|
|
* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@gmx.de>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "Token.h"
|
|
|
|
#include <AK/HashMap.h>
|
|
#include <AK/String.h>
|
|
#include <AK/StringView.h>
|
|
|
|
namespace JS {
|
|
|
|
class Lexer {
|
|
public:
|
|
explicit Lexer(StringView source);
|
|
|
|
Token next();
|
|
|
|
private:
|
|
void consume();
|
|
void consume_exponent();
|
|
bool is_eof() const;
|
|
bool is_identifier_start() const;
|
|
bool is_identifier_middle() const;
|
|
bool is_line_comment_start() const;
|
|
bool is_block_comment_start() const;
|
|
bool is_block_comment_end() const;
|
|
bool is_numeric_literal_start() const;
|
|
bool match(char, char) const;
|
|
bool match(char, char, char) const;
|
|
bool match(char, char, char, char) const;
|
|
|
|
StringView m_source;
|
|
size_t m_position { 0 };
|
|
Token m_current_token;
|
|
int m_current_char { 0 };
|
|
size_t m_line_number { 1 };
|
|
size_t m_line_column { 0 };
|
|
|
|
struct TemplateState {
|
|
bool in_expr;
|
|
u8 open_bracket_count;
|
|
};
|
|
Vector<TemplateState> m_template_states;
|
|
|
|
static HashMap<String, TokenType> s_keywords;
|
|
static HashMap<String, TokenType> s_three_char_tokens;
|
|
static HashMap<String, TokenType> s_two_char_tokens;
|
|
static HashMap<char, TokenType> s_single_char_tokens;
|
|
};
|
|
|
|
}
|