/**
* Get query parser instance
*
* @return Zend_Search_Lucene_Search_QueryParser
*/
private static function _getInstance()
{
if (self::$_instance === null) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* Parses a query string
*
* @param string $strQuery
* @param string $encoding
* @return Zend_Search_Lucene_Search_Query
* @throws Zend_Search_Lucene_Search_QueryParserException
*/
public static function parse($strQuery, $encoding = null)
{
if (self::$_instance === null) {
self::$_instance = new Zend_Search_Lucene_Search_QueryParser();
}
self::$_instance->_encoding = $encoding !== null ? $encoding : self::$_instance->_defaultEncoding;
self::$_instance->_lastToken = null;
self::$_instance->_context = new Zend_Search_Lucene_Search_QueryParserContext(self::$_instance->_encoding);
self::$_instance->_contextStack = array();
self::$_instance->_tokens = self::$_instance->_lexer->tokenize($strQuery, self::$_instance->_encoding);
// Empty query
if (count(self::$_instance->_tokens) == 0) {
return new Zend_Search_Lucene_Search_Query_Empty();
}
foreach (self::$_instance->_tokens as $token) {
try {
self::$_instance->_currentToken = $token;
self::$_instance->process($token->type);
self::$_instance->_lastToken = $token;
} catch (Exception $e) {
if (strpos($e->getMessage(), 'There is no any rule for') !== false) {
throw new Zend_Search_Lucene_Search_QueryParserException('Syntax error at char position ' . $token->position . '.');
}
throw $e;
}
}
if (count(self::$_instance->_contextStack) != 0) {
throw new Zend_Search_Lucene_Search_QueryParserException('Syntax Error: mismatched parentheses, every opening must have closing.');
}
return self::$_instance->_context->getQuery();
}
