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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to version 1.0 of the Zend Framework
* license, that is bundled with this package in the file LICENSE, and
* is available through the world-wide-web at the following URL:
* http://www.zend.com/license/framework/1_0.txt. If you did not receive
* a copy of the Zend Framework license and are unable to obtain it
* through the world-wide-web, please send a note to license@zend.com
* so we can mail you a copy immediately.
*
* @package Zend_Search_Lucene
* @subpackage Search
* @copyright Copyright (c) 2005-2006 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://www.zend.com/license/framework/1_0.txt Zend Framework License version 1.0
*/
/** Zend_Search_Lucene_Search_QueryTokenizer */
require_once 'Zend/Search/Lucene/Search/QueryTokenizer.php';
/** Zend_Search_Lucene_Index_Term */
require_once 'Zend/Search/Lucene/Index/Term.php';
/** Zend_Search_Lucene_Search_Query_Term */
require_once 'Zend/Search/Lucene/Search/Query/Term.php';
/** Zend_Search_Lucene_Search_Query_MultiTerm */
require_once 'Zend/Search/Lucene/Search/Query/MultiTerm.php';
/** Zend_Search_Lucene_Search_Query_Phrase */
require_once 'Zend/Search/Lucene/Search/Query/Phrase.php';
/** Zend_Search_Lucene_Exception */
require_once 'Zend/Search/Lucene/Exception.php';
/**
* @package Zend_Search_Lucene
* @subpackage Search
* @copyright Copyright (c) 2005-2006 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://www.zend.com/license/framework/1_0.txt Zend Framework License version 1.0
*/
class Zend_Search_Lucene_Search_QueryParser
{
/**
* Parses a query string, returning a Zend_Search_Lucene_Search_Query
*
* @param string $strQuery
* @return Zend_Search_Lucene_Search_Query
*/
static public function parse($strQuery)
{
$tokens = new Zend_Search_Lucene_Search_QueryTokenizer($strQuery);
// Empty query
if (!$tokens->count()) {
throw new Zend_Search_Lucene_Exception('Syntax error: query string cannot be empty.');
}
// Term query
if ($tokens->count() == 1) {
if ($tokens->current()->type == Zend_Search_Lucene_Search_QueryToken::TOKTYPE_WORD) {
return new Zend_Search_Lucene_Search_Query_Term(new Zend_Search_Lucene_Index_Term($tokens->current()->text, 'contents'));
} else {
throw new Zend_Search_Lucene_Exception('Syntax error: query string must contain at least one word.');
}
}
/**
* MultiTerm Query
*
* Process each token that was returned by the tokenizer.
*/
$terms = array();
$signs = array();
$prevToken = null;
$openBrackets = 0;
$field = 'contents';
foreach ($tokens as $token) {
switch ($token->type) {
case Zend_Search_Lucene_Search_QueryToken::TOKTYPE_WORD:
$terms[] = new Zend_Search_Lucene_Index_Term($token->text, $field);
$field = 'contents';
if ($prevToken !== null &&
$prevToken->type == Zend_Search_Lucene_Search_QueryToken::TOKTYPE_SIGN) {
if ($prevToken->text == "+") {
$signs[] = true;
} else {
$signs[] = false;
}
} else {
$signs[] = null;
}
break;
case Zend_Search_Lucene_Search_QueryToken::TOKTYPE_SIGN:
if ($prevToken !== null &&
$prevToken->type == Zend_Search_Lucene_Search_QueryToken::TOKTYPE_SIGN) {
throw new Zend_Search_Lucene_Exception('Syntax error: sign operator must be followed by a word.');
}
break;
case Zend_Search_Lucene_Search_QueryToken::TOKTYPE_FIELD:
$field = $token->text;
// let previous token to be signed as next $prevToken
$token = $prevToken;
break;
case Zend_Search_Lucene_Search_QueryToken::TOKTYPE_BRACKET:
$token->text=='(' ? $openBrackets++ : $openBrackets--;
}
$prevToken = $token;
}
// Finish up parsing: check the last token in the query for an opening sign or parenthesis.
if ($prevToken->type == Zend_Search_Lucene_Search_QueryToken::TOKTYPE_SIGN) {
throw new Zend_Search_Lucene_Exception('Syntax Error: sign operator must be followed by a word.');
}
// Finish up parsing: check that every opening bracket has a matching closing bracket.
if ($openBrackets != 0) {
throw new Zend_Search_Lucene_Exception('Syntax Error: mismatched parentheses, every opening must have closing.');
}
switch (count($terms)) {
case 0:
throw new Zend_Search_Lucene_Exception('Syntax error: bad term count.');
case 1:
return new Zend_Search_Lucene_Search_Query_Term($terms[0],$signs[0] !== false);
default:
return new Zend_Search_Lucene_Search_Query_MultiTerm($terms,$signs);
}
}
}
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