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doctrine2/lib/Doctrine/Query/Production/Expression.php

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2008-05-24 22:18:37 +04:00
<?php
/*
* $Id$
*
* 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
* OWNER 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.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.phpdoctrine.org>.
*/
/**
* Expression = Term {("+" | "-") Term}
*
* @package Doctrine
* @subpackage Query
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Janne Vanhala <jpvanhal@cc.hut.fi>
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @link http://www.phpdoctrine.org
* @since 2.0
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* @version $Revision$
*/
class Doctrine_Query_Production_Expression extends Doctrine_Query_Production
{
protected $_terms = array();
public function syntax($paramHolder)
{
// Expression = Term {("+" | "-") Term}
$this->_terms[] = $this->AST('Term', $paramHolder);
while ($this->_isNextToken('+') || $this->_isNextToken('-')) {
if ($this->_isNextToken('+')) {
$this->_parser->match('+');
$this->_terms[] = '+';
} else{
$this->_parser->match('-');
$this->_terms[] = '-';
}
$this->_terms[] = $this->AST('Term', $paramHolder);
}
// Optimize depth instances in AST
if (count($this->_terms) == 1) {
return $this->_terms[0];
}
}
public function semantical($paramHolder)
{
for ($i = 0, $l = count($this->_terms); $i < $l; $i++) {
if ($this->_terms[$i] != '+' && $this->_terms[$i] != '-') {
$this->_terms[$i]->semantical($paramHolder);
}
}
}
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public function buildSql()
{
return implode(' ', $this->_mapTerms());
}
protected function _mapTerms()
{
return array_map(array(&$this, '_mapTerm'), $this->_terms);
}
protected function _mapTerm($value)
{
return (is_string($value) ? $value : $value->buildSql());
}
/* Getters */
public function getTerms()
{
return $this->_terms;
}
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}