/** * Parses a query string. * * @return ParserResult */ public function parse() { $AST = $this->getAST(); if (($customWalkers = $this->query->getHint(Query::HINT_CUSTOM_TREE_WALKERS)) !== false) { $this->customTreeWalkers = $customWalkers; } if (($customOutputWalker = $this->query->getHint(Query::HINT_CUSTOM_OUTPUT_WALKER)) !== false) { $this->customOutputWalker = $customOutputWalker; } // Run any custom tree walkers over the AST if ($this->customTreeWalkers) { $treeWalkerChain = new TreeWalkerChain($this->query, $this->parserResult, $this->queryComponents); foreach ($this->customTreeWalkers as $walker) { $treeWalkerChain->addTreeWalker($walker); } switch (true) { case $AST instanceof AST\UpdateStatement: $treeWalkerChain->walkUpdateStatement($AST); break; case $AST instanceof AST\DeleteStatement: $treeWalkerChain->walkDeleteStatement($AST); break; case $AST instanceof AST\SelectStatement: default: $treeWalkerChain->walkSelectStatement($AST); } $this->queryComponents = $treeWalkerChain->getQueryComponents(); } $outputWalkerClass = $this->customOutputWalker ?: __NAMESPACE__ . '\\SqlWalker'; $outputWalker = new $outputWalkerClass($this->query, $this->parserResult, $this->queryComponents); // Assign an SQL executor to the parser result $this->parserResult->setSqlExecutor($outputWalker->getExecutor($AST)); return $this->parserResult; }