/**
* 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;
}
