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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: $Id$
*
*/
namespace PHPSQLParser\lexer;
/**
* 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", "'", "\"", "`",
",", "@", " ", "+", "-", "*", "/", ";");
/**
* @var string Regex string pattern of splitters.
*/
protected $splitterPattern;
/**
* Constructor.
*
* It initializes some fields.
*/
public function __construct() {
$this->splitterPattern = $this->convertSplittersToRegexPattern( self::$splitters );
}
/**
* Get the regex pattern string of all the splitters
*
* @return string
*/
public function getSplittersRegexPattern () {
return $this->splitterPattern;
}
/**
* Convert an array of splitter tokens to a regex pattern string.
*
* @param array $splitters
*
* @return string
*/
public function convertSplittersToRegexPattern( $splitters ) {
$regex_parts = array();
foreach ( $splitters as $part ) {
$part = preg_quote( $part );
switch ( $part ) {
case "\r\n":
$part = '\r\n';
break;
case "\t":
$part = '\t';
break;
case "\n":
$part = '\n';
break;
case " ":
$part = '\s';
break;
case "/":
$part = "\/";
break;
case "/\*":
$part = "\/\*";
break;
case "\*/":
$part = "\*\/";
break;
}
$regex_parts[] = $part;
}
$pattern = implode( '|', $regex_parts );
return '/(' . $pattern . ')/';
}
}
?>