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doctrine2/lib/Doctrine/Expression.php

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<?php
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/*
* $Id$
*
* 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.com>.
*/
Doctrine::autoload('Doctrine_Connection_Module');
/**
* Doctrine_Expression
*
* @package Doctrine
* @subpackage Expression
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @link www.phpdoctrine.com
* @since 1.0
* @version $Revision$
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
*/
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class Doctrine_Expression
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{
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protected $_expression;
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protected $_conn;
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public function __construct($expr, $conn = null)
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{
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$this->setExpression($expr);
if ($conn !== null) {
$this->_conn = $conn;
}
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}
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public function getConnection()
{
if ( ! isset($this->_conn)) {
return Doctrine_Manager::connection();
}
return $this->_conn;
}
public function setExpression($clause)
{
$this->_expression = $this->parseClause($clause);
}
public function parseExpression($expr)
{
$pos = strpos($expr, '(');
if ($pos === false) {
return $expr;
}
// get the name of the function
$name = substr($expr, 0, $pos);
$argStr = substr($expr, ($pos + 1), -1);
// parse args
foreach (Doctrine_Tokenizer::bracketExplode($argStr, ',') as $arg) {
$args[] = $this->parseClause($arg);
}
return call_user_func_array(array($this->getConnection()->expression, $name), $args);
}
public function parseClause($clause)
{
$e = Doctrine_Tokenizer::bracketExplode($clause, ' ');
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foreach ($e as $k => $expr) {
$e[$k] = $this->parseExpression($expr);
}
return implode(' ', $e);
}
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public function getSql()
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{
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return $this->_expression;
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}
public function __toString()
{
return $this->getSql();
}
}