<?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 LGPL. For more information, see

 * <http://www.doctrine-project.org>.

 */

namespace Doctrine\ORM\Query\AST\Functions;

use Doctrine\ORM\Query\Lexer;

use Doctrine\DBAL\Platforms\AbstractPlatform;

/**

 * "TRIM" "(" [["LEADING" | "TRAILING" | "BOTH"] [char] "FROM"] StringPrimary ")"

 *

 * @license http://www.opensource.org/licenses/lgpl-license.php LGPL

 * @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 TrimFunction extends FunctionNode

{

    public $leading;

    public $trailing;

    public $both;

    public $trimChar = false;

    public $stringPrimary;

    /**

     * @override

     */

    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)

    {

        $pos = AbstractPlatform::TRIM_UNSPECIFIED;

        if ($this->leading) {

            $pos = AbstractPlatform::TRIM_LEADING;

        } else if ($this->trailing) {

            $pos = AbstractPlatform::TRIM_TRAILING;

        } else if ($this->both) {

            $pos = AbstractPlatform::TRIM_BOTH;

        }

        return $sqlWalker->getConnection()->getDatabasePlatform()->getTrimExpression(

            $sqlWalker->walkStringPrimary($this->stringPrimary),

            $pos,

            ($this->trimChar != false) ? $sqlWalker->getConnection()->quote($this->trimChar) : false

        );

    }

    /**

     * @override

     */

    public function parse(\Doctrine\ORM\Query\Parser $parser)

    {

        $lexer = $parser->getLexer();

        $parser->match(Lexer::T_IDENTIFIER);

        $parser->match(Lexer::T_OPEN_PARENTHESIS);

        if (strcasecmp('leading', $lexer->lookahead['value']) === 0) {

            $parser->match(Lexer::T_LEADING);

            $this->leading = true;

        } else if (strcasecmp('trailing', $lexer->lookahead['value']) === 0) {

            $parser->match(Lexer::T_TRAILING);

            $this->trailing = true;

        } else if (strcasecmp('both', $lexer->lookahead['value']) === 0) {

            $parser->match(Lexer::T_BOTH);

            $this->both = true;

        }

        if ($lexer->isNextToken(Lexer::T_STRING)) {

            $parser->match(Lexer::T_STRING);

            $this->trimChar = $lexer->token['value'];

        }

        if ($this->leading || $this->trailing || $this->both || $this->trimChar) {

            $parser->match(Lexer::T_FROM);

        }

        $this->stringPrimary = $parser->StringPrimary();

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

    }

}