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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Search_Lucene
* @subpackage Analysis
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Utf8Num.php 20096 2010-01-06 02:05:09Z bkarwin $
*/
/** Zend_Search_Lucene_Analysis_Analyzer_Common */
require_once 'Zend/Search/Lucene/Analysis/Analyzer/Common.php';
/**
* @category Zend
* @package Zend_Search_Lucene
* @subpackage Analysis
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Search_Lucene_Analysis_Analyzer_Common_Utf8Num extends Zend_Search_Lucene_Analysis_Analyzer_Common
{
/**
* Current char position in an UTF-8 stream
*
* @var integer
*/
private $_position;
/**
* Current binary position in an UTF-8 stream
*
* @var integer
*/
private $_bytePosition;
/**
* Object constructor
*
* @throws Zend_Search_Lucene_Exception
*/
public function __construct()
{
if (@preg_match('/\pL/u', 'a') != 1) {
// PCRE unicode support is turned off
require_once 'Zend/Search/Lucene/Exception.php';
throw new Zend_Search_Lucene_Exception('Utf8Num analyzer needs PCRE unicode support to be enabled.');
}
}
/**
* Reset token stream
*/
public function reset()
{
$this->_position = 0;
$this->_bytePosition = 0;
// convert input into UTF-8
if (strcasecmp($this->_encoding, 'utf8' ) != 0 &&
strcasecmp($this->_encoding, 'utf-8') != 0 ) {
$this->_input = iconv($this->_encoding, 'UTF-8', $this->_input);
$this->_encoding = 'UTF-8';
}
}
/**
* Tokenization stream API
* Get next token
* Returns null at the end of stream
*
* @return Zend_Search_Lucene_Analysis_Token|null
*/
public function nextToken()
{
if ($this->_input === null) {
return null;
}
do {
if (! preg_match('/[\p{L}\p{N}]+/u', $this->_input, $match, PREG_OFFSET_CAPTURE, $this->_bytePosition)) {
// It covers both cases a) there are no matches (preg_match(...) === 0)
// b) error occured (preg_match(...) === FALSE)
return null;
}
// matched string
$matchedWord = $match[0][0];
// binary position of the matched word in the input stream
$binStartPos = $match[0][1];
// character position of the matched word in the input stream
$startPos = $this->_position +
iconv_strlen(substr($this->_input,
$this->_bytePosition,
$binStartPos - $this->_bytePosition),
'UTF-8');
// character postion of the end of matched word in the input stream
$endPos = $startPos + iconv_strlen($matchedWord, 'UTF-8');
$this->_bytePosition = $binStartPos + strlen($matchedWord);
$this->_position = $endPos;
$token = $this->normalize(new Zend_Search_Lucene_Analysis_Token($matchedWord, $startPos, $endPos));
} while ($token === null); // try again if token is skipped
return $token;
}
}
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