1292 lines
44 KiB
PHP
1292 lines
44 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.doctrine-project.org>.
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*/
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namespace Doctrine\ORM\Query;
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use Doctrine\ORM\Query\AST;
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use Doctrine\ORM\Query\Exec;
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/**
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* An LL(*) parser for the context-free grammar of Doctrine Query Language.
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* Parses a DQL query, reports any errors in it, and generates an AST.
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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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* @author Roman Borschel <roman@code-factory.org>
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @link http://www.doctrine-project.org
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* @since 2.0
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* @version $Revision$
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*/
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class Parser
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{
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/**
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* The minimum number of tokens read after last detected error before
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* another error can be reported.
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*
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* @var int
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*/
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//const MIN_ERROR_DISTANCE = 2;
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/**
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* Path expressions that were encountered during parsing of SelectExpressions
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* and still need to be validated.
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*
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* @var array
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*/
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private $_pendingPathExpressionsInSelect = array();
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/**
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* A scanner object.
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*
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* @var Doctrine_ORM_Query_Scanner
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*/
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protected $_lexer;
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/**
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* The Parser Result object.
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*
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* @var Doctrine_ORM_Query_ParserResult
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*/
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protected $_parserResult;
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/**
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* Keyword symbol table
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*
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* @var Token
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*/
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protected $_keywordTable;
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/**
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* The EntityManager.
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*
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* @var EnityManager
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*/
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protected $_em;
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/**
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* Creates a new query parser object.
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*
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* @param string $dql DQL to be parsed.
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* @param Doctrine_Connection $connection The connection to use
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*/
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public function __construct(\Doctrine\ORM\Query $query)
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{
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$this->_em = $query->getEntityManager();
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$this->_lexer = new Lexer($query->getDql());
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$this->_keywordTable = new Token();
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$defaultQueryComponent = ParserRule::DEFAULT_QUERYCOMPONENT;
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$this->_parserResult = new ParserResult(
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'',
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array( // queryComponent
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$defaultQueryComponent => array(
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'metadata' => null,
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'parent' => null,
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'relation' => null,
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'map' => null,
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'scalar' => null,
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),
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),
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array( // tableAliasMap
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$defaultQueryComponent => $defaultQueryComponent,
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)
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);
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$this->_parserResult->setEntityManager($this->_em);
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$this->free(true);
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}
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/**
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* Attempts to match the given token with the current lookahead token.
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*
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* If they match, updates the lookahead token; otherwise raises a syntax
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* error.
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*
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* @param int|string token type or value
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* @return bool True, if tokens match; false otherwise.
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*/
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public function match($token)
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{
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if (is_string($token)) {
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$isMatch = ($this->_lexer->lookahead['value'] === $token);
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} else {
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$isMatch = ($this->_lexer->lookahead['type'] === $token);
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}
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if ( ! $isMatch) {
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// No definition for value checking.
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$this->syntaxError($this->_keywordTable->getLiteral($token));
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}
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$this->_lexer->next();
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return true;
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}
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public function isA($value, $token)
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{
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return $this->_lexer->isA($value, $token);
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}
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/**
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* Free this parser enabling it to be reused
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*
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* @param boolean $deep Whether to clean peek and reset errors
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* @param integer $position Position to reset
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* @return void
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*/
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public function free($deep = false, $position = 0)
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{
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// WARNING! Use this method with care. It resets the scanner!
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$this->_lexer->resetPosition($position);
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// Deep = true cleans peek and also any previously defined errors
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if ($deep) {
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$this->_lexer->resetPeek();
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//$this->_errors = array();
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}
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$this->_lexer->token = null;
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$this->_lexer->lookahead = null;
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//$this->_errorDistance = self::MIN_ERROR_DISTANCE;
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}
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/**
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* Parses a query string.
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*/
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public function parse()
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{
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// Parse & build AST
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$AST = $this->_QueryLanguage();
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// Check for end of string
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if ($this->_lexer->lookahead !== null) {
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var_dump($this->_lexer->lookahead);
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$this->syntaxError('end of string');
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}
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// Create SqlWalker who creates the SQL from the AST
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$sqlWalker = new SqlWalker($this->_em, $this->_parserResult);
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// Assign the executor in parser result
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$this->_parserResult->setSqlExecutor(Exec\AbstractExecutor::create($AST, $sqlWalker));
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return $this->_parserResult;
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}
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/**
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* Returns the scanner object associated with this object.
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*
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* @return Doctrine_ORM_Query_Lexer
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*/
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public function getLexer()
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{
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return $this->_lexer;
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}
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/**
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* Returns the parser result associated with this object.
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*
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* @return Doctrine_ORM_Query_ParserResult
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*/
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public function getParserResult()
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{
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return $this->_parserResult;
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}
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/**
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* Generates a new syntax error.
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*
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* @param string $expected Optional expected string.
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* @param array $token Optional token.
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*/
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public function syntaxError($expected = '', $token = null)
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{
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if ($token === null) {
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$token = $this->_lexer->lookahead;
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}
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// Formatting message
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$message = 'line 0, col ' . (isset($token['position']) ? $token['position'] : '-1') . ': Error: ';
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if ($expected !== '') {
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$message .= "Expected '$expected', got ";
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} else {
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$message .= 'Unexpected ';
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}
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if ($this->_lexer->lookahead === null) {
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$message .= 'end of string.';
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} else {
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$message .= "'{$this->_lexer->lookahead['value']}'";
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}
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throw new QueryException($message);
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}
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/**
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* Generates a new semantical error.
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*
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* @param string $message Optional message.
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* @param array $token Optional token.
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*/
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public function semanticalError($message = '', $token = null)
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{
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if ($token === null) {
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$token = $this->_lexer->token;
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}
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//TODO: Include $token in $message
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throw new QueryException($message);
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}
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/**
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* Logs new error entry.
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*
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* @param string $message Message to log.
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* @param array $token Token that it was processing.
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*/
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/*protected function _logError($message = '', $token)
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{
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if ($this->_errorDistance >= self::MIN_ERROR_DISTANCE) {
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$message = 'line 0, col ' . $token['position'] . ': ' . $message;
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$this->_errors[] = $message;
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}
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$this->_errorDistance = 0;
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}*/
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/**
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* Gets the EntityManager used by the parser.
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*
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* @return EntityManager
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*/
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public function getEntityManager()
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{
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return $this->_em;
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}
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/**
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* Retrieve the piece of DQL string given the token position
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*
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* @param array $token Token that it was processing.
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* @return string Piece of DQL string.
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*/
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/*public function getQueryPiece($token, $previousChars = 10, $nextChars = 10)
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{
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$start = max(0, $token['position'] - $previousChars);
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$end = max($token['position'] + $nextChars, strlen($this->_input));
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return substr($this->_input, $start, $end);
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}*/
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/**
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* Checks if the next-next (after lookahead) token start a function.
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*
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* @return boolean
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*/
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private function _isFunction()
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{
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$next = $this->_lexer->glimpse();
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return ($next['value'] === '(');
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}
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/**
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* Checks whether the next 2 tokens start a subselect.
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*
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* @return boolean TRUE if the next 2 tokens start a subselect, FALSE otherwise.
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*/
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private function _isSubselect()
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{
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$la = $this->_lexer->lookahead;
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$next = $this->_lexer->glimpse();
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return ($la['value'] === '(' && $next['type'] === Token::T_SELECT);
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}
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/* Parse methods */
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/**
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* QueryLanguage ::= SelectStatement | UpdateStatement | DeleteStatement
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*
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* @return <type>
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*/
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private function _QueryLanguage()
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{
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$this->_lexer->next();
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switch ($this->_lexer->lookahead['type']) {
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case Token::T_SELECT:
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return $this->_SelectStatement();
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break;
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case Token::T_UPDATE:
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return $this->_UpdateStatement();
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break;
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case Token::T_DELETE:
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return $this->_DeleteStatement();
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break;
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default:
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$this->syntaxError('SELECT, UPDATE or DELETE');
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break;
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}
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}
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/**
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* SelectStatement ::= SelectClause FromClause [WhereClause] [GroupByClause] [HavingClause] [OrderByClause]
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*
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* @return <type>
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*/
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private function _SelectStatement()
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{
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$selectClause = $this->_SelectClause();
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$fromClause = $this->_FromClause();
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$this->_processPendingPathExpressionsInSelect();
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$whereClause = $this->_lexer->isNextToken(Token::T_WHERE) ?
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$this->_WhereClause() : null;
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$groupByClause = $this->_lexer->isNextToken(Token::T_GROUP) ?
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$this->_GroupByClause() : null;
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$havingClause = $this->_lexer->isNextToken(Token::T_HAVING) ?
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$this->_HavingClause() : null;
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$orderByClause = $this->_lexer->isNextToken(Token::T_ORDER) ?
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$this->_OrderByClause() : null;
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return new AST\SelectStatement(
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$selectClause, $fromClause, $whereClause, $groupByClause, $havingClause, $orderByClause
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);
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}
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/**
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* Processes pending path expressions that were encountered while parsing
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* select expressions. These will be validated to make sure they are indeed
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* valid <tt>StateFieldPathExpression</tt>s and additional information
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* is attached to their AST nodes.
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*/
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private function _processPendingPathExpressionsInSelect()
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{
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$qComps = $this->_parserResult->getQueryComponents();
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foreach ($this->_pendingPathExpressionsInSelect as $expr) {
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$parts = $expr->getParts();
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$numParts = count($parts);
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$dqlAlias = $parts[0];
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if (count($parts) == 2) {
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$expr->setIsSimpleStateFieldPathExpression(true);
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if ( ! $qComps[$dqlAlias]['metadata']->hasField($parts[1])) {
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$this->syntaxError();
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}
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} else {
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$embeddedClassFieldSeen = false;
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$assocSeen = false;
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for ($i = 1; $i < $numParts - 1; ++$i) {
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if ($qComps[$dqlAlias]['metadata']->hasAssociation($parts[$i])) {
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if ($embeddedClassFieldSeen) {
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$this->semanticalError('Invalid navigation path.');
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}
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// Indirect join
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$assoc = $qComps[$dqlAlias]['metadata']->getAssociationMapping($parts[$i]);
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if ( ! $assoc->isOneToOne()) {
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$this->semanticalError('Single-valued association expected.');
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}
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$expr->setIsSingleValuedAssociationPart($parts[$i]);
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//TODO...
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$assocSeen = true;
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} else if ($qComps[$dqlAlias]['metadata']->hasEmbeddedClassField($parts[$i])) {
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//TODO...
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$expr->setIsEmbeddedClassPart($parts[$i]);
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$this->syntaxError();
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} else {
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$this->syntaxError();
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}
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}
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if ( ! $assocSeen) {
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$expr->setIsSimpleStateFieldPathExpression(true);
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} else {
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$expr->setIsSimpleStateFieldAssociationPathExpression(true);
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}
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// Last part MUST be a simple state field
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if ( ! $qComps[$dqlAlias]['metadata']->hasField($parts[$numParts-1])) {
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$this->syntaxError();
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}
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}
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}
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}
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private function _UpdateStatement()
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{
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//TODO
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}
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private function _DeleteStatement()
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{
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//TODO
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}
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/**
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* SelectClause ::= "SELECT" ["DISTINCT"] SelectExpression {"," SelectExpression}
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*/
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private function _SelectClause()
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{
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$isDistinct = false;
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$this->match(Token::T_SELECT);
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// Inspecting if we are in a DISTINCT query
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if ($this->_lexer->isNextToken(Token::T_DISTINCT)) {
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$this->match(Token::T_DISTINCT);
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$isDistinct = true;
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}
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// Process SelectExpressions (1..N)
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$selectExpressions = array();
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$selectExpressions[] = $this->_SelectExpression();
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while ($this->_lexer->isNextToken(',')) {
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$this->match(',');
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$selectExpressions[] = $this->_SelectExpression();
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}
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return new AST\SelectClause($selectExpressions, $isDistinct);
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}
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/**
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* FromClause ::= "FROM" IdentificationVariableDeclaration {"," IdentificationVariableDeclaration}
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*/
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private function _FromClause()
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{
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$this->match(Token::T_FROM);
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$identificationVariableDeclarations = array();
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$identificationVariableDeclarations[] = $this->_IdentificationVariableDeclaration();
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while ($this->_lexer->isNextToken(',')) {
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$this->match(',');
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$identificationVariableDeclarations[] = $this->_IdentificationVariableDeclaration();
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}
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return new AST\FromClause($identificationVariableDeclarations);
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}
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/**
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* SelectExpression ::=
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* IdentificationVariable | StateFieldPathExpression |
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* (AggregateExpression | "(" Subselect ")") [["AS"] FieldAliasIdentificationVariable]
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*/
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private function _SelectExpression()
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{
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$expression = null;
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$fieldIdentificationVariable = null;
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$peek = $this->_lexer->glimpse();
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// First we recognize for an IdentificationVariable (DQL class alias)
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if ($peek['value'] != '.' && $this->_lexer->lookahead['type'] === Token::T_IDENTIFIER) {
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$expression = $this->_IdentificationVariable();
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} else if (($isFunction = $this->_isFunction()) !== false || $this->_isSubselect()) {
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$expression = $isFunction ? $this->_AggregateExpression() : $this->_Subselect();
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if ($this->_lexer->isNextToken(Token::T_AS)) {
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$this->match(Token::T_AS);
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$fieldIdentificationVariable = $this->_FieldAliasIdentificationVariable();
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} elseif ($this->_lexer->isNextToken(Token::T_IDENTIFIER)) {
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$fieldIdentificationVariable = $this->_FieldAliasIdentificationVariable();
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}
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} else {
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$expression = $this->_PathExpressionInSelect();
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}
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return new AST\SelectExpression($expression, $fieldIdentificationVariable);
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}
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|
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/**
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|
* IdentificationVariable ::= identifier
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*/
|
|
private function _IdentificationVariable()
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{
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$this->match(Token::T_IDENTIFIER);
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return $this->_lexer->token['value'];
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}
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|
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/**
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|
* IdentificationVariableDeclaration ::= RangeVariableDeclaration [IndexBy] {JoinVariableDeclaration}*
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*/
|
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private function _IdentificationVariableDeclaration()
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{
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$rangeVariableDeclaration = $this->_RangeVariableDeclaration();
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$indexBy = $this->_lexer->isNextToken(Token::T_INDEX) ?
|
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$this->_IndexBy() : null;
|
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$joinVariableDeclarations = array();
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while (
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$this->_lexer->isNextToken(Token::T_LEFT) ||
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$this->_lexer->isNextToken(Token::T_INNER) ||
|
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$this->_lexer->isNextToken(Token::T_JOIN)
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) {
|
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$joinVariableDeclarations[] = $this->_JoinVariableDeclaration();
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}
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|
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return new AST\IdentificationVariableDeclaration(
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$rangeVariableDeclaration, $indexBy, $joinVariableDeclarations
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);
|
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}
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|
|
/**
|
|
* RangeVariableDeclaration ::= AbstractSchemaName ["AS"] AliasIdentificationVariable
|
|
*/
|
|
private function _RangeVariableDeclaration()
|
|
{
|
|
$abstractSchemaName = $this->_AbstractSchemaName();
|
|
|
|
if ($this->_lexer->isNextToken(Token::T_AS)) {
|
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$this->match(Token::T_AS);
|
|
}
|
|
$aliasIdentificationVariable = $this->_AliasIdentificationVariable();
|
|
$classMetadata = $this->_em->getClassMetadata($abstractSchemaName);
|
|
|
|
// Building queryComponent
|
|
$queryComponent = array(
|
|
'metadata' => $classMetadata,
|
|
'parent' => null,
|
|
'relation' => null,
|
|
'map' => null,
|
|
'scalar' => null,
|
|
);
|
|
$this->_parserResult->setQueryComponent($aliasIdentificationVariable, $queryComponent);
|
|
|
|
return new AST\RangeVariableDeclaration(
|
|
$classMetadata, $aliasIdentificationVariable
|
|
);
|
|
}
|
|
|
|
/**
|
|
* AbstractSchemaName ::= identifier
|
|
*/
|
|
private function _AbstractSchemaName()
|
|
{
|
|
$this->match(Token::T_IDENTIFIER);
|
|
return $this->_lexer->token['value'];
|
|
}
|
|
|
|
/**
|
|
* AliasIdentificationVariable = identifier
|
|
*/
|
|
private function _AliasIdentificationVariable()
|
|
{
|
|
$this->match(Token::T_IDENTIFIER);
|
|
return $this->_lexer->token['value'];
|
|
}
|
|
|
|
/**
|
|
* Special rule that acceps all kinds of path expressions.
|
|
*/
|
|
private function _PathExpression()
|
|
{
|
|
$this->match(Token::T_IDENTIFIER);
|
|
$parts = array($this->_lexer->token['value']);
|
|
while ($this->_lexer->isNextToken('.')) {
|
|
$this->match('.');
|
|
$this->match(Token::T_IDENTIFIER);
|
|
$parts[] = $this->_lexer->token['value'];
|
|
}
|
|
$pathExpression = new AST\PathExpression($parts);
|
|
return $pathExpression;
|
|
}
|
|
|
|
/**
|
|
* Special rule that acceps all kinds of path expressions. and defers their
|
|
* semantical checking until the FROM part has been parsed completely (joins inclusive).
|
|
* Mainly used for path expressions in the SelectExpressions.
|
|
*/
|
|
private function _PathExpressionInSelect()
|
|
{
|
|
$expr = $this->_PathExpression();
|
|
$this->_pendingPathExpressionsInSelect[] = $expr;
|
|
return $expr;
|
|
}
|
|
|
|
/**
|
|
* JoinVariableDeclaration ::= Join [IndexBy]
|
|
*/
|
|
private function _JoinVariableDeclaration()
|
|
{
|
|
$join = $this->_Join();
|
|
$indexBy = $this->_lexer->isNextToken(Token::T_INDEX) ?
|
|
$this->_IndexBy() : null;
|
|
return new AST\JoinVariableDeclaration($join, $indexBy);
|
|
}
|
|
|
|
/**
|
|
* Join ::= ["LEFT" ["OUTER"] | "INNER"] "JOIN" JoinAssociationPathExpression
|
|
* ["AS"] AliasIdentificationVariable [("ON" | "WITH") ConditionalExpression]
|
|
*/
|
|
private function _Join()
|
|
{
|
|
// Check Join type
|
|
$joinType = AST\Join::JOIN_TYPE_INNER;
|
|
if ($this->_lexer->isNextToken(Token::T_LEFT)) {
|
|
$this->match(Token::T_LEFT);
|
|
// Possible LEFT OUTER join
|
|
if ($this->_lexer->isNextToken(Token::T_OUTER)) {
|
|
$this->match(Token::T_OUTER);
|
|
$joinType = AST\Join::JOIN_TYPE_LEFTOUTER;
|
|
} else {
|
|
$joinType = AST\Join::JOIN_TYPE_LEFT;
|
|
}
|
|
} else if ($this->_lexer->isNextToken(Token::T_INNER)) {
|
|
$this->match(Token::T_INNER);
|
|
}
|
|
|
|
$this->match(Token::T_JOIN);
|
|
|
|
$joinPathExpression = $this->_JoinPathExpression();
|
|
if ($this->_lexer->isNextToken(Token::T_AS)) {
|
|
$this->match(Token::T_AS);
|
|
}
|
|
|
|
$aliasIdentificationVariable = $this->_AliasIdentificationVariable();
|
|
|
|
// Verify that the association exists, if yes update the ParserResult
|
|
// with the new component.
|
|
$parentComp = $this->_parserResult->getQueryComponent($joinPathExpression->getIdentificationVariable());
|
|
$parentClass = $parentComp['metadata'];
|
|
$assocField = $joinPathExpression->getAssociationField();
|
|
if ( ! $parentClass->hasAssociation($assocField)) {
|
|
$this->semanticalError("Class " . $parentClass->getClassName() .
|
|
" has no association named '$assocField'.");
|
|
}
|
|
$targetClassName = $parentClass->getAssociationMapping($assocField)->getTargetEntityName();
|
|
|
|
// Building queryComponent
|
|
$joinQueryComponent = array(
|
|
'metadata' => $this->_em->getClassMetadata($targetClassName),
|
|
'parent' => $joinPathExpression->getIdentificationVariable(),
|
|
'relation' => $parentClass->getAssociationMapping($assocField),
|
|
'map' => null,
|
|
'scalar' => null,
|
|
);
|
|
$this->_parserResult->setQueryComponent($aliasIdentificationVariable, $joinQueryComponent);
|
|
|
|
// Create AST node
|
|
$join = new AST\Join($joinType, $joinPathExpression, $aliasIdentificationVariable);
|
|
|
|
// Check Join where type
|
|
if (
|
|
$this->_lexer->isNextToken(Token::T_ON) ||
|
|
$this->_lexer->isNextToken(Token::T_WITH)
|
|
) {
|
|
if ($this->_lexer->isNextToken(Token::T_ON)) {
|
|
$this->match(Token::T_ON);
|
|
$join->setWhereType(AST\Join::JOIN_WHERE_ON);
|
|
} else {
|
|
$this->match(Token::T_WITH);
|
|
}
|
|
$join->setConditionalExpression($this->_ConditionalExpression());
|
|
}
|
|
|
|
return $join;
|
|
}
|
|
|
|
/*private function _JoinAssociationPathExpression() {
|
|
if ($this->_isSingleValuedPathExpression()) {
|
|
return $this->_JoinSingleValuedAssociationPathExpression();
|
|
} else {
|
|
return $this->_JoinCollectionValuedPathExpression();
|
|
}
|
|
}*/
|
|
|
|
/*private function _isSingleValuedPathExpression()
|
|
{
|
|
$parserResult = $this->_parserResult;
|
|
|
|
// Trying to recoginize this grammar:
|
|
// IdentificationVariable "." (CollectionValuedAssociationField | SingleValuedAssociationField)
|
|
$token = $this->lookahead;
|
|
$this->_scanner->resetPeek();
|
|
if ($parserResult->hasQueryComponent($token['value'])) {
|
|
$queryComponent = $parserResult->getQueryComponent($token['value']);
|
|
$peek = $this->_scanner->peek();
|
|
if ($peek['value'] === '.') {
|
|
$peek2 = $this->_scanner->peek();
|
|
if ($queryComponent['metadata']->hasAssociation($peek2['value']) &&
|
|
$queryComponent['metadata']->getAssociationMapping($peek2['value'])->isOneToOne()) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}*/
|
|
|
|
/**
|
|
* JoinPathExpression ::= IdentificationVariable "." (CollectionValuedAssociationField | SingleValuedAssociationField)
|
|
*/
|
|
private function _JoinPathExpression()
|
|
{
|
|
$identificationVariable = $this->_IdentificationVariable();
|
|
$this->match('.');
|
|
$this->match(Token::T_IDENTIFIER);
|
|
$assocField = $this->_lexer->token['value'];
|
|
return new AST\JoinPathExpression(
|
|
$identificationVariable, $assocField
|
|
);
|
|
}
|
|
|
|
/**
|
|
* IndexBy ::= "INDEX" "BY" SimpleStateFieldPathExpression
|
|
*/
|
|
private function _IndexBy()
|
|
{
|
|
$this->match(Token::T_INDEX);
|
|
$this->match(Token::T_BY);
|
|
$pathExp = $this->_SimpleStateFieldPathExpression();
|
|
// Add the INDEX BY info to the query component
|
|
$qComp = $this->_parserResult->getQueryComponent($pathExp->getIdentificationVariable());
|
|
$qComp['map'] = $pathExp->getSimpleStateField();
|
|
$this->_parserResult->setQueryComponent($pathExp->getIdentificationVariable(), $qComp);
|
|
return $pathExp;
|
|
}
|
|
|
|
/**
|
|
* SimpleStateFieldPathExpression ::= IdentificationVariable "." StateField
|
|
*/
|
|
private function _SimpleStateFieldPathExpression()
|
|
{
|
|
$identificationVariable = $this->_IdentificationVariable();
|
|
$this->match('.');
|
|
$this->match(Token::T_IDENTIFIER);
|
|
$simpleStateField = $this->_lexer->token['value'];
|
|
return new AST\SimpleStateFieldPathExpression($identificationVariable, $simpleStateField);
|
|
}
|
|
|
|
/**
|
|
* StateFieldPathExpression ::= SimpleStateFieldPathExpression | SimpleStateFieldAssociationPathExpression
|
|
*/
|
|
private function _StateFieldPathExpression()
|
|
{
|
|
$parts = array();
|
|
$stateFieldSeen = false;
|
|
$assocSeen = false;
|
|
|
|
$identificationVariable = $this->_IdentificationVariable();
|
|
if ( ! $this->_parserResult->hasQueryComponent($identificationVariable)) {
|
|
$this->syntaxError("Identification variable.");
|
|
}
|
|
$qComp = $this->_parserResult->getQueryComponent($identificationVariable);
|
|
$parts[] = $identificationVariable;
|
|
|
|
$class = $qComp['metadata'];
|
|
|
|
if ( ! $this->_lexer->isNextToken('.')) {
|
|
$this->syntaxError();
|
|
}
|
|
|
|
while ($this->_lexer->isNextToken('.')) {
|
|
if ($stateFieldSeen) $this->syntaxError();
|
|
$this->match('.');
|
|
$part = $this->_IdentificationVariable();
|
|
if ($class->hasField($part)) {
|
|
$stateFieldSeen = true;
|
|
} else if ($class->hasAssociation($part)) {
|
|
$assoc = $class->getAssociationMapping($part);
|
|
$class = $this->_em->getClassMetadata($assoc->getTargetEntityName());
|
|
$assocSeen = true;
|
|
} else {
|
|
$this->syntaxError();
|
|
}
|
|
$parts[] = $part;
|
|
}
|
|
|
|
$pathExpr = new AST\PathExpression($parts);
|
|
|
|
if ($assocSeen) {
|
|
$pathExpr->setIsSimpleStateFieldAssociationPathExpression(true);
|
|
} else {
|
|
$pathExpr->setIsSimpleStateFieldPathExpression(true);
|
|
}
|
|
|
|
return $pathExpr;
|
|
}
|
|
|
|
/**
|
|
* AggregateExpression ::=
|
|
* ("AVG" | "MAX" | "MIN" | "SUM") "(" ["DISTINCT"] StateFieldPathExpression ")" |
|
|
* "COUNT" "(" ["DISTINCT"] (IdentificationVariable | SingleValuedAssociationPathExpression | StateFieldPathExpression) ")"
|
|
*/
|
|
private function _AggregateExpression()
|
|
{
|
|
$isDistinct = false;
|
|
$functionName = '';
|
|
if ($this->_lexer->isNextToken(Token::T_COUNT)) {
|
|
$this->match(Token::T_COUNT);
|
|
$functionName = $this->_lexer->token['value'];
|
|
$this->match('(');
|
|
if ($this->_lexer->isNextToken(Token::T_DISTINCT)) {
|
|
$this->match(Token::T_DISTINCT);
|
|
$isDistinct = true;
|
|
}
|
|
// For now we only support a PathExpression here...
|
|
$pathExp = $this->_PathExpression();
|
|
$this->match(')');
|
|
} else if ($this->_lexer->isNextToken(Token::T_AVG)) {
|
|
$this->match(Token::T_AVG);
|
|
$functionName = $this->_lexer->token['value'];
|
|
$this->match('(');
|
|
//...
|
|
} else {
|
|
$this->syntaxError('One of: MAX, MIN, AVG, SUM, COUNT');
|
|
}
|
|
return new AST\AggregateExpression($functionName, $pathExp, $isDistinct);
|
|
}
|
|
|
|
/**
|
|
* GroupByClause ::= "GROUP" "BY" GroupByItem {"," GroupByItem}*
|
|
* GroupByItem ::= SingleValuedPathExpression
|
|
*/
|
|
private function _GroupByClause()
|
|
{
|
|
$this->match(Token::T_GROUP);
|
|
$this->match(Token::T_BY);
|
|
$groupByItems = array();
|
|
$groupByItems[] = $this->_PathExpression();
|
|
while ($this->_lexer->isNextToken(',')) {
|
|
$this->match(',');
|
|
$groupByItems[] = $this->_PathExpression();
|
|
}
|
|
return new AST\GroupByClause($groupByItems);
|
|
}
|
|
|
|
/**
|
|
* WhereClause ::= "WHERE" ConditionalExpression
|
|
*/
|
|
private function _WhereClause()
|
|
{
|
|
$this->match(Token::T_WHERE);
|
|
return new AST\WhereClause($this->_ConditionalExpression());
|
|
}
|
|
|
|
/**
|
|
* ConditionalExpression ::= ConditionalTerm {"OR" ConditionalTerm}*
|
|
*/
|
|
private function _ConditionalExpression()
|
|
{
|
|
$conditionalTerms = array();
|
|
$conditionalTerms[] = $this->_ConditionalTerm();
|
|
while ($this->_lexer->isNextToken(Token::T_OR)) {
|
|
$this->match(Token::T_OR);
|
|
$conditionalTerms[] = $this->_ConditionalTerm();
|
|
}
|
|
return new AST\ConditionalExpression($conditionalTerms);
|
|
}
|
|
|
|
/**
|
|
* ConditionalTerm ::= ConditionalFactor {"AND" ConditionalFactor}*
|
|
*/
|
|
private function _ConditionalTerm()
|
|
{
|
|
$conditionalFactors = array();
|
|
$conditionalFactors[] = $this->_ConditionalFactor();
|
|
while ($this->_lexer->isNextToken(Token::T_AND)) {
|
|
$this->match(Token::T_AND);
|
|
$conditionalFactors[] = $this->_ConditionalFactor();
|
|
}
|
|
return new AST\ConditionalTerm($conditionalFactors);
|
|
}
|
|
|
|
/**
|
|
* ConditionalFactor ::= ["NOT"] ConditionalPrimary
|
|
*/
|
|
private function _ConditionalFactor()
|
|
{
|
|
$not = false;
|
|
if ($this->_lexer->isNextToken(Token::T_NOT)) {
|
|
$this->match(Token::T_NOT);
|
|
$not = true;
|
|
}
|
|
return new AST\ConditionalFactor($this->_ConditionalPrimary(), $not);
|
|
}
|
|
|
|
/**
|
|
* ConditionalPrimary ::= SimpleConditionalExpression | "(" ConditionalExpression ")"
|
|
*/
|
|
private function _ConditionalPrimary()
|
|
{
|
|
$condPrimary = new AST\ConditionalPrimary;
|
|
if ($this->_lexer->isNextToken('(')) {
|
|
$numUnmatched = 1;
|
|
$peek = $this->_lexer->peek();
|
|
while ($numUnmatched > 0) {
|
|
if ($peek['value'] == ')') {
|
|
--$numUnmatched;
|
|
} else if ($peek['value'] == '(') {
|
|
++$numUnmatched;
|
|
}
|
|
$peek = $this->_lexer->peek();
|
|
}
|
|
$this->_lexer->resetPeek();
|
|
|
|
//TODO: This is not complete, what about LIKE/BETWEEN/...etc?
|
|
$comparisonOps = array("=", "<", "<=", "<>", ">", ">=", "!=");
|
|
|
|
if (in_array($peek['value'], $comparisonOps)) {
|
|
$condPrimary->setSimpleConditionalExpression($this->_SimpleConditionalExpression());
|
|
} else {
|
|
$this->match('(');
|
|
$conditionalExpression = $this->_ConditionalExpression();
|
|
$this->match(')');
|
|
$condPrimary->setConditionalExpression($conditionalExpression);
|
|
}
|
|
} else {
|
|
$condPrimary->setSimpleConditionalExpression($this->_SimpleConditionalExpression());
|
|
}
|
|
return $condPrimary;
|
|
}
|
|
|
|
/**
|
|
* SimpleConditionalExpression ::=
|
|
* ComparisonExpression | BetweenExpression | LikeExpression |
|
|
* InExpression | NullComparisonExpression | ExistsExpression |
|
|
* EmptyCollectionComparisonExpression | CollectionMemberExpression
|
|
*/
|
|
private function _SimpleConditionalExpression()
|
|
{
|
|
if ($this->_lexer->isNextToken(Token::T_NOT)) {
|
|
$token = $this->_lexer->glimpse();
|
|
} else {
|
|
$token = $this->_lexer->lookahead;
|
|
}
|
|
if ($token['type'] === Token::T_EXISTS) {
|
|
return $this->_ExistsExpression();
|
|
}
|
|
|
|
$stateFieldPathExpr = false;
|
|
if ($token['type'] === Token::T_IDENTIFIER) {
|
|
// Peek beyond the PathExpression
|
|
$stateFieldPathExpr = true;
|
|
$peek = $this->_lexer->peek();
|
|
while ($peek['value'] === '.') {
|
|
$this->_lexer->peek();
|
|
$peek = $this->_lexer->peek();
|
|
}
|
|
$this->_lexer->resetPeek();
|
|
$token = $peek;
|
|
}
|
|
|
|
if ($stateFieldPathExpr) {
|
|
switch ($token['type']) {
|
|
case Token::T_BETWEEN:
|
|
return $this->_BetweenExpression();
|
|
case Token::T_LIKE:
|
|
return $this->_LikeExpression();
|
|
case Token::T_IN:
|
|
return $this->_InExpression();
|
|
case Token::T_IS:
|
|
return $this->_NullComparisonExpression();
|
|
case Token::T_NONE:
|
|
return $this->_ComparisonExpression();
|
|
default:
|
|
$this->syntaxError();
|
|
}
|
|
} else if ($token['value'] == '(') {
|
|
return $this->_ComparisonExpression();
|
|
} else {
|
|
switch ($token['type']) {
|
|
case Token::T_INTEGER:
|
|
// IF it turns out its a ComparisonExpression, then it MUST be ArithmeticExpression
|
|
break;
|
|
case Token::T_STRING:
|
|
// IF it turns out its a ComparisonExpression, then it MUST be StringExpression
|
|
break;
|
|
default:
|
|
$this->syntaxError();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* SIMPLIFIED FROM BNF FOR NOW
|
|
* ComparisonExpression ::= ArithmeticExpression ComparisonOperator ( QuantifiedExpression | ArithmeticExpression )
|
|
*/
|
|
private function _ComparisonExpression()
|
|
{
|
|
$leftExpr = $this->_ArithmeticExpression();
|
|
$operator = $this->_ComparisonOperator();
|
|
if ($this->_lexer->lookahead['type'] === Token::T_ALL ||
|
|
$this->_lexer->lookahead['type'] === Token::T_ANY ||
|
|
$this->_lexer->lookahead['type'] === Token::T_SOME) {
|
|
$rightExpr = $this->_QuantifiedExpression();
|
|
} else {
|
|
$rightExpr = $this->_ArithmeticExpression();
|
|
}
|
|
return new AST\ComparisonExpression($leftExpr, $operator, $rightExpr);
|
|
}
|
|
|
|
/**
|
|
* ArithmeticExpression ::= SimpleArithmeticExpression | "(" Subselect ")"
|
|
*/
|
|
private function _ArithmeticExpression()
|
|
{
|
|
$expr = new AST\ArithmeticExpression;
|
|
if ($this->_lexer->lookahead['value'] === '(') {
|
|
$peek = $this->_lexer->glimpse();
|
|
if ($peek['type'] === Token::T_SELECT) {
|
|
$expr->setSubselect($this->_Subselect());
|
|
return $expr;
|
|
}
|
|
}
|
|
$expr->setSimpleArithmeticExpression($this->_SimpleArithmeticExpression());
|
|
return $expr;
|
|
}
|
|
|
|
/**
|
|
* SimpleArithmeticExpression ::= ArithmeticTerm {("+" | "-") ArithmeticTerm}*
|
|
*/
|
|
private function _SimpleArithmeticExpression()
|
|
{
|
|
$terms = array();
|
|
$terms[] = $this->_ArithmeticTerm();
|
|
while ($this->_lexer->lookahead['value'] == '+' || $this->_lexer->lookahead['value'] == '-') {
|
|
if ($this->_lexer->lookahead['value'] == '+') {
|
|
$this->match('+');
|
|
} else {
|
|
$this->match('-');
|
|
}
|
|
$terms[] = $this->_lexer->token['value'];
|
|
$terms[] = $this->_ArithmeticTerm();
|
|
}
|
|
return new AST\SimpleArithmeticExpression($terms);
|
|
}
|
|
|
|
/**
|
|
* ArithmeticTerm ::= ArithmeticFactor {("*" | "/") ArithmeticFactor}*
|
|
*/
|
|
private function _ArithmeticTerm()
|
|
{
|
|
$factors = array();
|
|
$factors[] = $this->_ArithmeticFactor();
|
|
while ($this->_lexer->lookahead['value'] == '*' || $this->_lexer->lookahead['value'] == '/') {
|
|
if ($this->_lexer->lookahead['value'] == '*') {
|
|
$this->match('*');
|
|
} else {
|
|
$this->match('/');
|
|
}
|
|
$factors[] = $this->_lexer->token['value'];
|
|
$factors[] = $this->_ArithmeticFactor();
|
|
}
|
|
return new AST\ArithmeticTerm($factors);
|
|
}
|
|
|
|
/**
|
|
* ArithmeticFactor ::= [("+" | "-")] ArithmeticPrimary
|
|
*/
|
|
private function _ArithmeticFactor()
|
|
{
|
|
$pSign = $nSign = false;
|
|
if ($this->_lexer->lookahead['value'] == '+') {
|
|
$this->match('+');
|
|
$pSign = true;
|
|
} else if ($this->_lexer->lookahead['value'] == '-') {
|
|
$this->match('-');
|
|
$nSign = true;
|
|
}
|
|
return new AST\ArithmeticFactor($this->_ArithmeticPrimary(), $pSign, $nSign);
|
|
}
|
|
|
|
/**
|
|
* ArithmeticPrimary ::= StateFieldPathExpression | Literal | "(" SimpleArithmeticExpression ")" | Function | AggregateExpression
|
|
*/
|
|
private function _ArithmeticPrimary()
|
|
{
|
|
if ($this->_lexer->lookahead['value'] === '(') {
|
|
$this->match('(');
|
|
$expr = $this->_SimpleArithmeticExpression();
|
|
$this->match(')');
|
|
return $expr;
|
|
}
|
|
switch ($this->_lexer->lookahead['type']) {
|
|
case Token::T_IDENTIFIER:
|
|
$peek = $this->_lexer->glimpse();
|
|
if ($peek['value'] == '(') {
|
|
if ($this->_isAggregateFunction($peek['type'])) {
|
|
return $this->_AggregateExpression();
|
|
}
|
|
return $this->_FunctionsReturningStrings();
|
|
}
|
|
return $this->_StateFieldPathExpression();
|
|
case Token::T_INPUT_PARAMETER:
|
|
$this->match($this->_lexer->lookahead['value']);
|
|
return new AST\InputParameter($this->_lexer->token['value']);
|
|
case Token::T_STRING:
|
|
case Token::T_INTEGER:
|
|
case Token::T_FLOAT:
|
|
$this->match($this->_lexer->lookahead['value']);
|
|
return $this->_lexer->token['value'];
|
|
default:
|
|
$this->syntaxError();
|
|
}
|
|
throw new Doctrine_Exception("Not yet implemented.");
|
|
//TODO...
|
|
}
|
|
|
|
/**
|
|
* PortableFunctionsReturningStrings ::=
|
|
* "CONCAT" "(" StringPrimary "," StringPrimary ")" |
|
|
* "SUBSTRING" "(" StringPrimary "," SimpleArithmeticExpression "," SimpleArithmeticExpression ")" |
|
|
* "TRIM" "(" [["LEADING" | "TRAILING" | "BOTH"] [char] "FROM"] StringPrimary ")" |
|
|
* "LOWER" "(" StringPrimary ")" |
|
|
* "UPPER" "(" StringPrimary ")"
|
|
*/
|
|
private function _FunctionsReturningStrings()
|
|
{
|
|
switch (strtoupper($this->_lexer->lookahead['value'])) {
|
|
case 'CONCAT':
|
|
|
|
break;
|
|
case 'SUBSTRING':
|
|
|
|
break;
|
|
case 'TRIM':
|
|
$this->match($this->_lexer->lookahead['value']);
|
|
$this->match('(');
|
|
//TODO: This is not complete! See BNF
|
|
$this->_StringPrimary();
|
|
break;
|
|
case 'LOWER':
|
|
|
|
break;
|
|
case 'UPPER':
|
|
|
|
default:
|
|
$this->syntaxError('CONCAT, SUBSTRING, TRIM or UPPER');
|
|
}
|
|
}
|
|
|
|
private function _isAggregateFunction($tokenType)
|
|
{
|
|
switch ($tokenType) {
|
|
case Token::T_AVG:
|
|
case Token::T_MIN:
|
|
case Token::T_MAX:
|
|
case Token::T_SUM:
|
|
case Token::T_COUNT:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ComparisonOperator ::= "=" | "<" | "<=" | "<>" | ">" | ">=" | "!="
|
|
*/
|
|
private function _ComparisonOperator()
|
|
{
|
|
switch ($this->_lexer->lookahead['value']) {
|
|
case '=':
|
|
$this->match('=');
|
|
return '=';
|
|
case '<':
|
|
$this->match('<');
|
|
$operator = '<';
|
|
if ($this->_lexer->isNextToken('=')) {
|
|
$this->match('=');
|
|
$operator .= '=';
|
|
} else if ($this->_lexer->isNextToken('>')) {
|
|
$this->match('>');
|
|
$operator .= '>';
|
|
}
|
|
return $operator;
|
|
case '>':
|
|
$this->match('>');
|
|
$operator = '>';
|
|
if ($this->_lexer->isNextToken('=')) {
|
|
$this->match('=');
|
|
$operator .= '=';
|
|
}
|
|
return $operator;
|
|
case '!':
|
|
$this->match('!');
|
|
$this->match('=');
|
|
return '<>';
|
|
default:
|
|
$this->syntaxError('=, <, <=, <>, >, >=, !=');
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* LikeExpression ::= StringExpression ["NOT"] "LIKE" string ["ESCAPE" char]
|
|
*/
|
|
private function _LikeExpression()
|
|
{
|
|
$stringExpr = $this->_StringExpression();
|
|
$isNot = false;
|
|
if ($this->_lexer->lookahead['type'] === Token::T_NOT) {
|
|
$this->match(Token::T_NOT);
|
|
$isNot = true;
|
|
}
|
|
$this->match(Token::T_LIKE);
|
|
$this->match(Token::T_STRING);
|
|
$stringPattern = $this->_lexer->token['value'];
|
|
$escapeChar = null;
|
|
if ($this->_lexer->lookahead['type'] === Token::T_ESCAPE) {
|
|
$this->match(Token::T_ESCAPE);
|
|
var_dump($this->_lexer->lookahead);
|
|
//$this->match(Token::T_)
|
|
//$escapeChar =
|
|
}
|
|
return new AST\LikeExpression($stringExpr, $stringPattern, $isNot, $escapeChar);
|
|
}
|
|
|
|
/**
|
|
* StringExpression ::= StringPrimary | "(" Subselect ")"
|
|
*/
|
|
private function _StringExpression()
|
|
{
|
|
if ($this->_lexer->lookahead['value'] === '(') {
|
|
$peek = $this->_lexer->glimpse();
|
|
if ($peek['type'] === Token::T_SELECT) {
|
|
return $this->_Subselect();
|
|
}
|
|
}
|
|
return $this->_StringPrimary();
|
|
}
|
|
|
|
/**
|
|
* StringPrimary ::= StateFieldPathExpression | string | InputParameter | FunctionsReturningStrings | AggregateExpression
|
|
*/
|
|
private function _StringPrimary()
|
|
{
|
|
if ($this->_lexer->lookahead['type'] === Token::T_IDENTIFIER) {
|
|
$peek = $this->_lexer->glimpse();
|
|
if ($peek['value'] == '.') {
|
|
return $this->_StateFieldPathExpression();
|
|
} else if ($peek['value'] == '(') {
|
|
//TODO... FunctionsReturningStrings or AggregateExpression
|
|
} else {
|
|
$this->syntaxError("'.' or '('");
|
|
}
|
|
} else if ($this->_lexer->lookahead['type'] === Token::T_STRING) {
|
|
//TODO...
|
|
} else if ($this->_lexer->lookahead['type'] === Token::T_INPUT_PARAMETER) {
|
|
//TODO...
|
|
} else {
|
|
$this->syntaxError('StateFieldPathExpression | string | InputParameter | FunctionsReturningStrings | AggregateExpression');
|
|
}
|
|
}
|
|
}
|