<?php
/*
 *  $Id: Set.php 5901 2009-06-22 15:44:45Z jwage $
 *
 * 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>.
 */

/**
 * Doctrine_Query
 *
 * @package     Doctrine
 * @subpackage  Query
 * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @link        www.phpdoctrine.org
 * @since       1.0
 * @version     $Revision: 5901 $
 * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
 */
class Doctrine_Query_Set extends Doctrine_Query_Part
{
    public function parse($dql)
    {
	    $terms = $this->_tokenizer->sqlExplode($dql, ' ');
        $termsTranslation = array();
    	
        foreach ($terms as $term) {
	        $termOriginal = $term;
	    
	        // We need to check for agg functions here
            $matches = array();
            $hasAggExpression = $this->_processPossibleAggExpression($term, $matches);

            $lftExpr = (($hasAggExpression) ? $matches[1] . '(' : '');
            $rgtExpr = (($hasAggExpression) ? $matches[3] . ')' : '');
	
	        preg_match_all("/^([a-zA-Z0-9_]+[\.[a-zA-Z0-9_]+]*)(\sAS\s[a-zA-Z0-9_]+)?/i", $term, $m, PREG_SET_ORDER);
            
            if (isset($m[0])) {
                $processed = array();
                
                foreach ($m as $piece) {
                    $part = $piece[1];
                    $e = explode('.', trim($part));

                    $fieldName  = array_pop($e);
                    $reference  = (count($e) > 0) ? implode('.', $e) : $this->query->getRootAlias();
                    $aliasMap   = $this->query->getQueryComponent($reference);

                    if ($aliasMap['table']->hasField($fieldName)) {	
	                    $columnName = $aliasMap['table']->getColumnName($fieldName);
                        $columnName = $aliasMap['table']->getConnection()->quoteIdentifier($columnName);

                        $part = $columnName;
                    }
                    
                    $processed[] = $part . (isset($piece[2]) ? $piece[2] : '');
                }
                
                $termsTranslation[$termOriginal] = $lftExpr . implode(' ', $processed) . $rgtExpr;
            }
        } 

        return strtr($dql, $termsTranslation);
    }


    protected function _processPossibleAggExpression(& $expr, & $matches = array())
    {
        $hasAggExpr = preg_match('/(.*[^\s\(\=])\(([^\)]*)\)(.*)/', $expr, $matches);
        
        if ($hasAggExpr) {
            $expr = $matches[2];

            // We need to process possible comma separated items
            if (substr(trim($matches[3]), 0, 1) == ',') {
                $xplod = $this->_tokenizer->sqlExplode(trim($matches[3], ' )'), ',');
                
                $matches[3] = array();
                    
                foreach ($xplod as $part) {
                    if ($part != '') {
                        $matches[3][] = $this->parseLiteralValue($part);
                    }
                }

                $matches[3] = '), ' . implode(', ', $matches[3]);
            }
        }
        
        return $hasAggExpr;
    }
}