| 1 | <?php |
| 2 | /* |
| 3 | * $Id: Expression.php 2702 2007-10-03 21:43:22Z Jonathan.Wage $ |
| 4 | * |
| 5 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 6 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 7 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 8 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 9 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 10 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 11 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 12 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 13 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 14 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 15 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 16 | * |
| 17 | * This software consists of voluntary contributions made by many individuals |
| 18 | * and is licensed under the LGPL. For more information, see |
| 19 | * <http://www.phpdoctrine.com>. |
| 20 | */ |
| 21 | Doctrine::autoload('Doctrine_Connection_Module'); |
| 22 | /** |
| 23 | * Doctrine_Expression |
| 24 | * |
| 25 | * @package Doctrine |
| 26 | * @subpackage Expression |
| 27 | * @license http://www.opensource.org/licenses/lgpl-license.php LGPL |
| 28 | * @link www.phpdoctrine.com |
| 29 | * @since 1.0 |
| 30 | * @version $Revision: 2702 $ |
| 31 | * @author Konsta Vesterinen <kvesteri@cc.hut.fi> |
| 32 | */ |
| 33 | class Doctrine_Expression |
| 34 | { |
| 35 | protected $_expression; |
| 36 | |
| 37 | protected $_conn; |
| 38 | |
| 39 | public function __construct($expr, $conn = null) |
| 40 | { |
| 41 | $this->setExpression($expr); |
| 42 | |
| 43 | if ($conn !== null) { |
| 44 | $this->_conn = $conn; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | public function getConnection() |
| 49 | { |
| 50 | if ( ! isset($this->_conn)) { |
| 51 | return Doctrine_Manager::connection(); |
| 52 | } |
| 53 | |
| 54 | return $this->_conn; |
| 55 | } |
| 56 | |
| 57 | public function setExpression($clause) |
| 58 | { |
| 59 | $this->_expression = $this->parseClause($clause); |
| 60 | } |
| 61 | |
| 62 | public function parseExpression($expr) |
| 63 | { |
| 64 | $pos = strpos($expr, '('); |
| 65 | if ($pos === false) { |
| 66 | return $expr; |
| 67 | } |
| 68 | |
| 69 | // get the name of the function |
| 70 | $name = substr($expr, 0, $pos); |
| 71 | $argStr = substr($expr, ($pos + 1), -1); |
| 72 | |
| 73 | // parse args |
| 74 | foreach (Doctrine_Tokenizer::bracketExplode($argStr, ',') as $arg) { |
| 75 | $args[] = $this->parseClause($arg); |
| 76 | } |
| 77 | |
| 78 | return call_user_func_array(array($this->getConnection()->expression, $name), $args); |
| 79 | } |
| 80 | |
| 81 | public function parseClause($clause) |
| 82 | { |
| 83 | $e = Doctrine_Tokenizer::bracketExplode($clause, ' '); |
| 84 | |
| 85 | foreach ($e as $k => $expr) { |
| 86 | $e[$k] = $this->parseExpression($expr); |
| 87 | } |
| 88 | |
| 89 | return implode(' ', $e); |
| 90 | } |
| 91 | |
| 92 | public function getSql() |
| 93 | { |
| 94 | |
| 95 | return $this->_expression; |
| 96 | } |
| 97 | |
| 98 | public function __toString() |
| 99 | { |
| 100 | return $this->getSql(); |
| 101 | } |
| 102 | } |