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<?php
/**
* LexerSplitter.php
*
* Defines the characters, which are used to split the given SQL string.
* Part of PHPSQLParser.
*
* PHP version 5
*
* LICENSE:
* Copyright (c) 2010-2014 Justin Swanhart and André Rothe
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* @author André Rothe <andre.rothe@phosco.info>
* @copyright 2010-2014 Justin Swanhart and André Rothe
* @license http://www.debian.org/misc/bsd.license BSD License (3 Clause)
* @version SVN: $Id: LexerSplitter.php 842 2013-12-30 08:57:53Z phosco@gmx.de $
*
*/
/**
* This class holds a sorted array of characters, which are used as stop token.
* On every part of the array the given SQL string will be split into single tokens.
* The array must be sorted by element size, longest first (3 chars -> 2 chars -> 1 char).
*
* @author André Rothe <andre.rothe@phosco.info>
* @license http://www.debian.org/misc/bsd.license BSD License (3 Clause)
*
*/
class LexerSplitter {
protected static $splitters = array("<=>", "\r\n", "!=", ">=", "<=", "<>", "<<", ">>", ":=", "\\", "&&", "||", ":=",
"/*", "*/", "--", ">", "<", "|", "=", "^", "(", ")", "\t", "\n", "'", "\"", "`",
",", "@", " ", "+", "-", "*", "/", ";");
protected $tokenSize;
protected $hashSet;
/**
* Constructor.
*
* It initializes some fields.
*/
public function __construct() {
$this->tokenSize = strlen(self::$splitters[0]); // should be the largest one
$this->hashSet = array_flip(self::$splitters);
}
/**
* Get the maximum length of a split token.
*
* The largest element must be on position 0 of the internal $_splitters array,
* so the function returns the length of that token. It must be > 0.
*
* @return int The number of characters for the largest split token.
*/
public function getMaxLengthOfSplitter() {
return $this->tokenSize;
}
/**
* Looks into the internal split token array and compares the given token with
* the array content. It returns true, if the token will be found, false otherwise.
*
* @param String $token a string, which could be a split token.
*
* @return boolean true, if the given string will be a split token, false otherwise
*/
public function isSplitter($token) {
return isset($this->hashSet[$token]);
}
}
?>
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