99 lines
3.9 KiB
PHP
99 lines
3.9 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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/**
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* SelectExpression ::= IdentificationVariable ["." "*"] | StateFieldPathExpression |
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* (AggregateExpression | "(" Subselect ")") [["AS"] FieldAliasIdentificationVariable]
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*
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* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
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* @author Janne Vanhala <jpvanhal@cc.hut.fi>
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @link http://www.phpdoctrine.org
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* @since 1.0
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* @version $Revision$
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*/
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class Doctrine_ORM_Query_Parser_SelectExpression extends Doctrine_ORM_Query_ParserRule
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{
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protected $_AST = null;
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protected $_expression = null;
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protected $_fieldIdentificationVariable = null;
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public function syntax()
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{
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// SelectExpression ::= IdentificationVariable ["." "*"] | StateFieldPathExpression |
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// (AggregateExpression | "(" Subselect ")") [["AS"] FieldAliasIdentificationVariable]
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$this->_AST = $this->AST('SelectExpression');
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// First we recognize for an IdentificationVariable (Component alias)
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if ($this->_isIdentificationVariable()) {
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$this->_expression = $this->parse('IdentificationVariable');
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// Inspecting if we are in a ["." "*"]
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if ($this->_isNextToken('.')) {
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$this->_parser->match('.');
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$this->_parser->match('*');
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}
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} else if (($isFunction = $this->_isFunction()) !== false || $this->_isSubselect()) {
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$this->_expression = $this->parse($isFunction ? 'AggregateExpression' : 'Subselect');
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if ($this->_isNextToken(Doctrine_ORM_Query_Token::T_AS)) {
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$this->_parser->match(Doctrine_ORM_Query_Token::T_AS);
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$this->_fieldIdentificationVariable = $this->parse('FieldAliasIdentificationVariable');
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} elseif ($this->_isNextToken(Doctrine_ORM_Query_Token::T_IDENTIFIER)) {
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$this->_fieldIdentificationVariable = $this->parse('FieldAliasIdentificationVariable');
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}
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} else {
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$this->_expression = $this->parse('StateFieldPathExpression');
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}
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}
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public function semantical()
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{
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$this->_AST->setExpression($this->_expression->semantical());
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if ($this->_fieldIdentificationVariable !== null) {
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$this->_AST->setFieldIdentificationVariable($this->_fieldIdentificationVariable->semantical());
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}
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// Return AST node
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return $this->_AST;
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}
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protected function _isIdentificationVariable()
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{
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// Trying to recoginize this grammar: IdentificationVariable ["." "*"]
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$token = $this->_parser->lookahead;
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$this->_parser->getScanner()->resetPeek();
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// We have an identifier here
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if ($token['type'] === Doctrine_ORM_Query_Token::T_IDENTIFIER) {
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return true;
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}
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return false;
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}
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} |