RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 15:07:45 +00:00
Code Issues Activity Actions

LibSQL: Introduce a SQL library with a tokenizer

Browse source 
LibSQL aims to be a SQLite clone for SerenityOS. Step 1 is creating a
tokenizer to lex SQL tokens. This lexer is heavily influenced by the
LibJS lexer.
This commit is contained in:
Timothy Flynn 2021-04-18 17:35:40 -04:00 • committed by Andreas Kling
parent 55b7b8e930
commit 90517da9ca
6 changed files with 716 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

71
Userland/Libraries/LibSQL/Lexer.h Normal file
View file

@ -0,0 +1,71 @@
/*
* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
* 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 SQL {
class Lexer {
public:
explicit Lexer(StringView source);
Token next();
private:
void consume();
bool consume_whitespace_and_comments();
bool consume_numeric_literal();
bool consume_exponent();
bool consume_hexadecimal_number();
bool match(char a, char b) const;
bool is_identifier_start() const;
bool is_identifier_middle() const;
bool is_numeric_literal_start() const;
bool is_line_comment_start() const;
bool is_block_comment_start() const;
bool is_block_comment_end() const;
bool is_line_break() const;
bool is_eof() const;
static HashMap<String, TokenType> s_keywords;
static HashMap<char, TokenType> s_one_char_tokens;
static HashMap<String, TokenType> s_two_char_tokens;
StringView m_source;
size_t m_line_number { 1 };
size_t m_line_column { 0 };
char m_current_char { 0 };
size_t m_position { 0 };
};
}