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LibSQL: Introduce a SQL library with a tokenizer
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.
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Userland/Libraries/LibSQL/Lexer.h
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Userland/Libraries/LibSQL/Lexer.h
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/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "Token.h"
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#include <AK/HashMap.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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namespace SQL {
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class Lexer {
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public:
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explicit Lexer(StringView source);
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Token next();
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private:
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void consume();
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bool consume_whitespace_and_comments();
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bool consume_numeric_literal();
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bool consume_exponent();
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bool consume_hexadecimal_number();
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bool match(char a, char b) const;
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bool is_identifier_start() const;
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bool is_identifier_middle() const;
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bool is_numeric_literal_start() const;
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bool is_line_comment_start() const;
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bool is_block_comment_start() const;
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bool is_block_comment_end() const;
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bool is_line_break() const;
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bool is_eof() const;
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static HashMap<String, TokenType> s_keywords;
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static HashMap<char, TokenType> s_one_char_tokens;
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static HashMap<String, TokenType> s_two_char_tokens;
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StringView m_source;
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size_t m_line_number { 1 };
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size_t m_line_column { 0 };
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char m_current_char { 0 };
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size_t m_position { 0 };
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};
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}
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