<?php
/*
 * 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 MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ORM\Query\AST\Functions;

use Doctrine\ORM\Query\Lexer;

/**
 * "CONCAT" "(" StringPrimary "," StringPrimary {"," StringPrimary }* ")"
 *
 *
 * @link    www.doctrine-project.org
 * @since   2.0
 * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author  Jonathan Wage <jonwage@gmail.com>
 * @author  Roman Borschel <roman@code-factory.org>
 * @author  Benjamin Eberlei <kontakt@beberlei.de>
 */
class ConcatFunction extends FunctionNode
{
    public $firstStringPrimary;
    
    public $secondStringPrimary;
    
    public $concatExpressions = array();
    
    /**
     * @override
     */
    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
    {
        $platform = $sqlWalker->getConnection()->getDatabasePlatform();
        
        $args = array();
        
        foreach ($this->concatExpressions as $expression) {
            $args[] = $sqlWalker->walkStringPrimary($expression);
        }
        
        return call_user_func_array(array($platform,'getConcatExpression'), $args);
    }

    /**
     * @override
     */
    public function parse(\Doctrine\ORM\Query\Parser $parser)
    {
        $parser->match(Lexer::T_IDENTIFIER);
        $parser->match(Lexer::T_OPEN_PARENTHESIS);
        
        $this->firstStringPrimary = $parser->StringPrimary();
        $this->concatExpressions[] = $this->firstStringPrimary;
        
        $parser->match(Lexer::T_COMMA);
        
        $this->secondStringPrimary = $parser->StringPrimary();
        $this->concatExpressions[] = $this->secondStringPrimary;
        
        while ($parser->getLexer()->isNextToken(Lexer::T_COMMA)) {
 		    $parser->match(Lexer::T_COMMA);
	        $this->concatExpressions[] = $parser->StringPrimary();
        }

        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
    }
}

