145 lines
3.8 KiB
PHP
145 lines
3.8 KiB
PHP
<?php
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/*
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* $Id$
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software consists of voluntary contributions made by many individuals
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* and is licensed under the LGPL. For more information, see
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* <http://www.phpdoctrine.org>.
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*/
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Doctrine::autoload('Doctrine_Connection_Module');
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/**
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* Doctrine_Expression
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*
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* @package Doctrine
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* @subpackage Expression
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @link www.phpdoctrine.com
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* @since 1.0
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* @version $Revision$
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* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
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*/
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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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protected $_tokenizer;
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/**
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* Create an expression
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*
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* @param string $expr The expression
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* @param Doctrine_Connection $conn The connection (optional)
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* @return void
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*/
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public function __construct($expr, $conn = null)
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{
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$this->_tokenizer = new Doctrine_Query_Tokenizer();
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$this->setExpression($expr);
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if ($conn !== null) {
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$this->_conn = $conn;
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}
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}
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/**
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* getConnection
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*
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* @return Doctrine_Connection The connection
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*/
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public function getConnection()
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{
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if ( ! isset($this->_conn)) {
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return Doctrine_Manager::connection();
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}
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return $this->_conn;
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}
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/**
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* setExpression
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*
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* @param string $clause The expression to set
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* @return void
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*/
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public function setExpression($clause)
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{
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$this->_expression = $this->parseClause($clause);
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}
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/**
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* parseExpression
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*
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* @todo: What does this function do?
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*
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* @param string $expr The expression to parse
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* @return void
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*/
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public function parseExpression($expr)
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{
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$pos = strpos($expr, '(');
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if ($pos === false) {
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return $expr;
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}
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// get the name of the function
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$name = substr($expr, 0, $pos);
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$argStr = substr($expr, ($pos + 1), -1);
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// parse args
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foreach ($this->_tokenizer->bracketExplode($argStr, ',') as $arg) {
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$args[] = $this->parseClause($arg);
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}
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return call_user_func_array(array($this->getConnection()->expression, $name), $args);
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}
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/**
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* parseClause
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*
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* @param string $clause The clause
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* @return string The parse clause
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*/
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public function parseClause($clause)
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{
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$e = $this->_tokenizer->bracketExplode($clause, ' ');
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foreach ($e as $k => $expr) {
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$e[$k] = $this->parseExpression($expr);
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}
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return implode(' ', $e);
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}
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/**
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* getSql
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*
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* @return string The expression
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*/
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public function getSql()
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{
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return $this->_expression;
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}
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/**
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* __toString
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*
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* @return void
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*/
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public function __toString()
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{
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return $this->getSql();
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}
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}
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