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LibSQL: Introduce a SQL library with a tokenizer

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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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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
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73
Userland/Libraries/LibSQL/Token.cpp Normal file
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/*
* 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.
*/
#include "Token.h"
#include <AK/Assertions.h>
#include <AK/String.h>
#include <stdlib.h>
namespace SQL {
StringView Token::name(TokenType type)
{
switch (type) {
#define __ENUMERATE_SQL_TOKEN(value, type, category) \
case TokenType::type: \
return #type;
ENUMERATE_SQL_TOKENS
#undef __ENUMERATE_SQL_TOKEN
default:
VERIFY_NOT_REACHED();
}
}
TokenCategory Token::category(TokenType type)
{
switch (type) {
#define __ENUMERATE_SQL_TOKEN(value, type, category) \
case TokenType::type: \
return TokenCategory::category;
ENUMERATE_SQL_TOKENS
#undef __ENUMERATE_SQL_TOKEN
default:
VERIFY_NOT_REACHED();
}
}
double Token::double_value() const
{
VERIFY(type() == TokenType::NumericLiteral);
String value(m_value);
if (value[0] == '0' && value.length() >= 2) {
if (value[1] == 'x' || value[1] == 'X')
return static_cast<double>(strtoul(value.characters() + 2, nullptr, 16));
}
return strtod(value.characters(), nullptr);
}
}