/library/Zend/Search/Lucene/Index/Term.php
PHP | 144 lines | 61 code | 16 blank | 67 comment | 13 complexity | 177ecfbc2b5136b06c033b1a0ad8dbcf MD5 | raw file
- <?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 Index
- * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: Term.php 24593 2012-01-05 20:35:02Z matthew $
- */
- /**
- * A Term represents a word from text. This is the unit of search. It is
- * composed of two elements, the text of the word, as a string, and the name of
- * the field that the text occured in, an interned string.
- *
- * Note that terms may represent more than words from text fields, but also
- * things like dates, email addresses, urls, etc.
- *
- * @category Zend
- * @package Zend_Search_Lucene
- * @subpackage Index
- * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- */
- class Zend_Search_Lucene_Index_Term
- {
- /**
- * Field name or field number (depending from context)
- *
- * @var mixed
- */
- public $field;
- /**
- * Term value
- *
- * @var string
- */
- public $text;
- /**
- * Object constructor
- */
- public function __construct($text, $field = null)
- {
- $this->field = ($field === null)? Zend_Search_Lucene::getDefaultSearchField() : $field;
- $this->text = $text;
- }
- /**
- * Returns term key
- *
- * @return string
- */
- public function key()
- {
- return $this->field . chr(0) . $this->text;
- }
- /**
- * Get term prefix
- *
- * @param string $str
- * @param integer $length
- * @return string
- */
- public static function getPrefix($str, $length)
- {
- $prefixBytes = 0;
- $prefixChars = 0;
- while ($prefixBytes < strlen($str) && $prefixChars < $length) {
- $charBytes = 1;
- if ((ord($str[$prefixBytes]) & 0xC0) == 0xC0) {
- $charBytes++;
- if (ord($str[$prefixBytes]) & 0x20 ) {
- $charBytes++;
- if (ord($str[$prefixBytes]) & 0x10 ) {
- $charBytes++;
- }
- }
- }
- if ($prefixBytes + $charBytes > strlen($str)) {
- // wrong character
- break;
- }
- $prefixChars++;
- $prefixBytes += $charBytes;
- }
- return substr($str, 0, $prefixBytes);
- }
- /**
- * Get UTF-8 string length
- *
- * @param string $str
- * @return string
- */
- public static function getLength($str)
- {
- $bytes = 0;
- $chars = 0;
- while ($bytes < strlen($str)) {
- $charBytes = 1;
- if ((ord($str[$bytes]) & 0xC0) == 0xC0) {
- $charBytes++;
- if (ord($str[$bytes]) & 0x20 ) {
- $charBytes++;
- if (ord($str[$bytes]) & 0x10 ) {
- $charBytes++;
- }
- }
- }
- if ($bytes + $charBytes > strlen($str)) {
- // wrong character
- break;
- }
- $chars++;
- $bytes += $charBytes;
- }
- return $chars;
- }
- }