129 lines
3.9 KiB
PHP
129 lines
3.9 KiB
PHP
<?php
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/**
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* LexerSplitter.php
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*
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* Defines the characters, which are used to split the given SQL string.
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* Part of PHPSQLParser.
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*
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* PHP version 5
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*
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* LICENSE:
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* Copyright (c) 2010-2014 Justin Swanhart and André Rothe
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @author André Rothe <andre.rothe@phosco.info>
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* @copyright 2010-2014 Justin Swanhart and André Rothe
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* @license http://www.debian.org/misc/bsd.license BSD License (3 Clause)
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* @version SVN: $Id$
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*
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*/
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namespace PHPSQLParser\lexer;
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/**
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* This class holds a sorted array of characters, which are used as stop token.
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* On every part of the array the given SQL string will be split into single tokens.
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* The array must be sorted by element size, longest first (3 chars -> 2 chars -> 1 char).
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*
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* @author André Rothe <andre.rothe@phosco.info>
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* @license http://www.debian.org/misc/bsd.license BSD License (3 Clause)
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*
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*/
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class LexerSplitter {
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protected static $splitters = array("<=>", "\r\n", "!=", ">=", "<=", "<>", "<<", ">>", ":=", "\\", "&&", "||", ":=",
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"/*", "*/", "--", ">", "<", "|", "=", "^", "(", ")", "\t", "\n", "'", "\"", "`",
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",", "@", " ", "+", "-", "*", "/", ";");
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/**
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* @var string Regex string pattern of splitters.
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*/
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protected $splitterPattern;
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/**
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* Constructor.
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*
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* It initializes some fields.
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*/
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public function __construct() {
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$this->splitterPattern = $this->convertSplittersToRegexPattern( self::$splitters );
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}
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/**
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* Get the regex pattern string of all the splitters
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*
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* @return string
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*/
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public function getSplittersRegexPattern () {
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return $this->splitterPattern;
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}
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/**
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* Convert an array of splitter tokens to a regex pattern string.
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*
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* @param array $splitters
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*
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* @return string
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*/
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public function convertSplittersToRegexPattern( $splitters ) {
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$regex_parts = array();
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foreach ( $splitters as $part ) {
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$part = preg_quote( $part );
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switch ( $part ) {
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case "\r\n":
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$part = '\r\n';
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break;
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case "\t":
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$part = '\t';
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break;
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case "\n":
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$part = '\n';
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break;
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case " ":
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$part = '\s';
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break;
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case "/":
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$part = "\/";
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break;
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case "/\*":
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$part = "\/\*";
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break;
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case "\*/":
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$part = "\*\/";
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break;
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}
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$regex_parts[] = $part;
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}
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$pattern = implode( '|', $regex_parts );
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return '/(' . $pattern . ')/';
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}
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}
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?>
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