96 lines
3.8 KiB
PHP
96 lines
3.8 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: LexerSplitter.php 842 2013-12-30 08:57:53Z phosco@gmx.de $
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*
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*/
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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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protected $tokenSize;
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protected $hashSet;
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/**
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* Constructor.
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*
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* It initializes some fields.
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*/
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public function __construct() {
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$this->tokenSize = strlen(self::$splitters[0]); // should be the largest one
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$this->hashSet = array_flip(self::$splitters);
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}
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/**
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* Get the maximum length of a split token.
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*
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* The largest element must be on position 0 of the internal $_splitters array,
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* so the function returns the length of that token. It must be > 0.
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*
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* @return int The number of characters for the largest split token.
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*/
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public function getMaxLengthOfSplitter() {
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return $this->tokenSize;
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}
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/**
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* Looks into the internal split token array and compares the given token with
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* the array content. It returns true, if the token will be found, false otherwise.
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*
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* @param String $token a string, which could be a split token.
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*
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* @return boolean true, if the given string will be a split token, false otherwise
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*/
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public function isSplitter($token) {
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return isset($this->hashSet[$token]);
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}
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}
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?>
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