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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_QueryToken */
require_once 'Zend/Search/Lucene/Search/QueryToken.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_QueryTokenizer implements Iterator
{
/**
* inputString tokens.
*
* @var array
*/
protected $_tokens = array();
/**
* tokens pointer.
*
* @var integer
*/
protected $_currToken = 0;
/**
* QueryTokenize constructor needs query string as a parameter.
*
* @param string $inputString
*/
public function __construct($inputString)
{
if (!strlen($inputString)) {
throw new Zend_Search_Lucene_Exception('Cannot tokenize empty query string.');
}
$currentToken = '';
for ($count = 0; $count < strlen($inputString); $count++) {
if (ctype_alnum( $inputString{$count} )) {
$currentToken .= $inputString{$count};
} else {
// Previous token is finished
if (strlen($currentToken)) {
$this->_tokens[] = new Zend_Search_Lucene_Search_QueryToken(Zend_Search_Lucene_Search_QueryToken::TOKTYPE_WORD,
$currentToken);
$currentToken = '';
}
if ($inputString{$count} == '+' || $inputString{$count} == '-') {
$this->_tokens[] = new Zend_Search_Lucene_Search_QueryToken(Zend_Search_Lucene_Search_QueryToken::TOKTYPE_SIGN,
$inputString{$count});
} elseif ($inputString{$count} == '(' || $inputString{$count} == ')') {
$this->_tokens[] = new Zend_Search_Lucene_Search_QueryToken(Zend_Search_Lucene_Search_QueryToken::TOKTYPE_BRACKET,
$inputString{$count});
} elseif ($inputString{$count} == ':' && $this->count()) {
if ($this->_tokens[count($this->_tokens)-1]->type == Zend_Search_Lucene_Search_QueryToken::TOKTYPE_WORD) {
$this->_tokens[count($this->_tokens)-1]->type = Zend_Search_Lucene_Search_QueryToken::TOKTYPE_FIELD;
}
}
}
}
if (strlen($currentToken)) {
$this->_tokens[] = new Zend_Search_Lucene_Search_QueryToken(Zend_Search_Lucene_Search_QueryToken::TOKTYPE_WORD, $currentToken);
}
if (empty($this->_tokens))
$this->_tokens[] = $inputString;
}
/**
* Returns number of tokens
*
* @return integer
*/
public function count()
{
return count($this->_tokens);
}
/**
* Returns TRUE if a token exists at the current position.
*
* @return boolean
*/
public function valid()
{
return $this->_currToken < $this->count();
}
/**
* Resets token stream.
*
* @return integer
*/
public function rewind()
{
$this->_currToken = 0;
}
/**
* Returns the token at the current position or FALSE if
* the position does not contain a valid token.
*
* @return mixed
*/
public function current()
{
return $this->valid() ? $this->_tokens[$this->_currToken] : false;
}
/**
* Returns next token
*
* @return Zend_Search_Lucene_Search_QueryToken
*/
public function next()
{
return ++$this->_currToken;
}
/**
* Return the position of the current token.
*
* @return integer
*/
public function key()
{
return $this->_currToken;
}
}
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