--- /dev/null
+<?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 Search
+ * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license http://framework.zend.com/license/new-bsd New BSD License
+ * @version $Id: Wildcard.php 16971 2009-07-22 18:05:45Z mikaelkael $
+ */
+
+
+/** Zend_Search_Lucene_Search_Query */
+require_once 'Zend/Search/Lucene/Search/Query.php';
+
+/** Zend_Search_Lucene_Search_Query_MultiTerm */
+require_once 'Zend/Search/Lucene/Search/Query/MultiTerm.php';
+
+
+/**
+ * @category Zend
+ * @package Zend_Search_Lucene
+ * @subpackage Search
+ * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license http://framework.zend.com/license/new-bsd New BSD License
+ */
+class Zend_Search_Lucene_Search_Query_Wildcard extends Zend_Search_Lucene_Search_Query
+{
+ /**
+ * Search pattern.
+ *
+ * Field has to be fully specified or has to be null
+ * Text may contain '*' or '?' symbols
+ *
+ * @var Zend_Search_Lucene_Index_Term
+ */
+ private $_pattern;
+
+ /**
+ * Matched terms.
+ *
+ * Matched terms list.
+ * It's filled during the search (rewrite operation) and may be used for search result
+ * post-processing
+ *
+ * Array of Zend_Search_Lucene_Index_Term objects
+ *
+ * @var array
+ */
+ private $_matches = null;
+
+ /**
+ * Minimum term prefix length (number of minimum non-wildcard characters)
+ *
+ * @var integer
+ */
+ private static $_minPrefixLength = 3;
+
+ /**
+ * Zend_Search_Lucene_Search_Query_Wildcard constructor.
+ *
+ * @param Zend_Search_Lucene_Index_Term $pattern
+ */
+ public function __construct(Zend_Search_Lucene_Index_Term $pattern)
+ {
+ $this->_pattern = $pattern;
+ }
+
+ /**
+ * Get minimum prefix length
+ *
+ * @return integer
+ */
+ public static function getMinPrefixLength()
+ {
+ return self::$_minPrefixLength;
+ }
+
+ /**
+ * Set minimum prefix length
+ *
+ * @param integer $minPrefixLength
+ */
+ public static function setMinPrefixLength($minPrefixLength)
+ {
+ self::$_minPrefixLength = $minPrefixLength;
+ }
+
+ /**
+ * Get terms prefix
+ *
+ * @param string $word
+ * @return string
+ */
+ private static function _getPrefix($word)
+ {
+ $questionMarkPosition = strpos($word, '?');
+ $astrericPosition = strpos($word, '*');
+
+ if ($questionMarkPosition !== false) {
+ if ($astrericPosition !== false) {
+ return substr($word, 0, min($questionMarkPosition, $astrericPosition));
+ }
+
+ return substr($word, 0, $questionMarkPosition);
+ } else if ($astrericPosition !== false) {
+ return substr($word, 0, $astrericPosition);
+ }
+
+ return $word;
+ }
+
+ /**
+ * Re-write query into primitive queries in the context of specified index
+ *
+ * @param Zend_Search_Lucene_Interface $index
+ * @return Zend_Search_Lucene_Search_Query
+ * @throws Zend_Search_Lucene_Exception
+ */
+ public function rewrite(Zend_Search_Lucene_Interface $index)
+ {
+ $this->_matches = array();
+
+ if ($this->_pattern->field === null) {
+ // Search through all fields
+ $fields = $index->getFieldNames(true /* indexed fields list */);
+ } else {
+ $fields = array($this->_pattern->field);
+ }
+
+ $prefix = self::_getPrefix($this->_pattern->text);
+ $prefixLength = strlen($prefix);
+ $matchExpression = '/^' . str_replace(array('\\?', '\\*'), array('.', '.*') , preg_quote($this->_pattern->text, '/')) . '$/';
+
+ if ($prefixLength < self::$_minPrefixLength) {
+ throw new Zend_Search_Lucene_Exception('At least ' . self::$_minPrefixLength . ' non-wildcard characters are required at the beginning of pattern.');
+ }
+
+ /** @todo check for PCRE unicode support may be performed through Zend_Environment in some future */
+ if (@preg_match('/\pL/u', 'a') == 1) {
+ // PCRE unicode support is turned on
+ // add Unicode modifier to the match expression
+ $matchExpression .= 'u';
+ }
+
+ $maxTerms = Zend_Search_Lucene::getTermsPerQueryLimit();
+ foreach ($fields as $field) {
+ $index->resetTermsStream();
+
+ if ($prefix != '') {
+ $index->skipTo(new Zend_Search_Lucene_Index_Term($prefix, $field));
+
+ while ($index->currentTerm() !== null &&
+ $index->currentTerm()->field == $field &&
+ substr($index->currentTerm()->text, 0, $prefixLength) == $prefix) {
+ if (preg_match($matchExpression, $index->currentTerm()->text) === 1) {
+ $this->_matches[] = $index->currentTerm();
+
+ if ($maxTerms != 0 && count($this->_matches) > $maxTerms) {
+ throw new Zend_Search_Lucene_Exception('Terms per query limit is reached.');
+ }
+ }
+
+ $index->nextTerm();
+ }
+ } else {
+ $index->skipTo(new Zend_Search_Lucene_Index_Term('', $field));
+
+ while ($index->currentTerm() !== null && $index->currentTerm()->field == $field) {
+ if (preg_match($matchExpression, $index->currentTerm()->text) === 1) {
+ $this->_matches[] = $index->currentTerm();
+
+ if ($maxTerms != 0 && count($this->_matches) > $maxTerms) {
+ throw new Zend_Search_Lucene_Exception('Terms per query limit is reached.');
+ }
+ }
+
+ $index->nextTerm();
+ }
+ }
+
+ $index->closeTermsStream();
+ }
+
+ if (count($this->_matches) == 0) {
+ return new Zend_Search_Lucene_Search_Query_Empty();
+ } else if (count($this->_matches) == 1) {
+ return new Zend_Search_Lucene_Search_Query_Term(reset($this->_matches));
+ } else {
+ $rewrittenQuery = new Zend_Search_Lucene_Search_Query_MultiTerm();
+
+ foreach ($this->_matches as $matchedTerm) {
+ $rewrittenQuery->addTerm($matchedTerm);
+ }
+
+ return $rewrittenQuery;
+ }
+ }
+
+ /**
+ * Optimize query in the context of specified index
+ *
+ * @param Zend_Search_Lucene_Interface $index
+ * @return Zend_Search_Lucene_Search_Query
+ */
+ public function optimize(Zend_Search_Lucene_Interface $index)
+ {
+ throw new Zend_Search_Lucene_Exception('Wildcard query should not be directly used for search. Use $query->rewrite($index)');
+ }
+
+
+ /**
+ * Returns query pattern
+ *
+ * @return Zend_Search_Lucene_Index_Term
+ */
+ public function getPattern()
+ {
+ return $this->_pattern;
+ }
+
+
+ /**
+ * Return query terms
+ *
+ * @return array
+ * @throws Zend_Search_Lucene_Exception
+ */
+ public function getQueryTerms()
+ {
+ if ($this->_matches === null) {
+ throw new Zend_Search_Lucene_Exception('Search has to be performed first to get matched terms');
+ }
+
+ return $this->_matches;
+ }
+
+ /**
+ * Constructs an appropriate Weight implementation for this query.
+ *
+ * @param Zend_Search_Lucene_Interface $reader
+ * @return Zend_Search_Lucene_Search_Weight
+ * @throws Zend_Search_Lucene_Exception
+ */
+ public function createWeight(Zend_Search_Lucene_Interface $reader)
+ {
+ throw new Zend_Search_Lucene_Exception('Wildcard query should not be directly used for search. Use $query->rewrite($index)');
+ }
+
+
+ /**
+ * Execute query in context of index reader
+ * It also initializes necessary internal structures
+ *
+ * @param Zend_Search_Lucene_Interface $reader
+ * @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
+ * @throws Zend_Search_Lucene_Exception
+ */
+ public function execute(Zend_Search_Lucene_Interface $reader, $docsFilter = null)
+ {
+ throw new Zend_Search_Lucene_Exception('Wildcard query should not be directly used for search. Use $query->rewrite($index)');
+ }
+
+ /**
+ * Get document ids likely matching the query
+ *
+ * It's an array with document ids as keys (performance considerations)
+ *
+ * @return array
+ * @throws Zend_Search_Lucene_Exception
+ */
+ public function matchedDocs()
+ {
+ throw new Zend_Search_Lucene_Exception('Wildcard query should not be directly used for search. Use $query->rewrite($index)');
+ }
+
+ /**
+ * Score specified document
+ *
+ * @param integer $docId
+ * @param Zend_Search_Lucene_Interface $reader
+ * @return float
+ * @throws Zend_Search_Lucene_Exception
+ */
+ public function score($docId, Zend_Search_Lucene_Interface $reader)
+ {
+ throw new Zend_Search_Lucene_Exception('Wildcard query should not be directly used for search. Use $query->rewrite($index)');
+ }
+
+ /**
+ * Query specific matches highlighting
+ *
+ * @param Zend_Search_Lucene_Search_Highlighter_Interface $highlighter Highlighter object (also contains doc for highlighting)
+ */
+ protected function _highlightMatches(Zend_Search_Lucene_Search_Highlighter_Interface $highlighter)
+ {
+ $words = array();
+
+ $matchExpression = '/^' . str_replace(array('\\?', '\\*'), array('.', '.*') , preg_quote($this->_pattern->text, '/')) . '$/';
+ if (@preg_match('/\pL/u', 'a') == 1) {
+ // PCRE unicode support is turned on
+ // add Unicode modifier to the match expression
+ $matchExpression .= 'u';
+ }
+
+ $docBody = $highlighter->getDocument()->getFieldUtf8Value('body');
+ $tokens = Zend_Search_Lucene_Analysis_Analyzer::getDefault()->tokenize($docBody, 'UTF-8');
+ foreach ($tokens as $token) {
+ if (preg_match($matchExpression, $token->getTermText()) === 1) {
+ $words[] = $token->getTermText();
+ }
+ }
+
+ $highlighter->highlight($words);
+ }
+
+ /**
+ * Print a query
+ *
+ * @return string
+ */
+ public function __toString()
+ {
+ // It's used only for query visualisation, so we don't care about characters escaping
+ if ($this->_pattern->field !== null) {
+ $query = $this->_pattern->field . ':';
+ } else {
+ $query = '';
+ }
+
+ $query .= $this->_pattern->text;
+
+ if ($this->getBoost() != 1) {
+ $query = $query . '^' . round($this->getBoost(), 4);
+ }
+
+ return $query;
+ }
+}
+
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