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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 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: QueryParserContext.php 18954 2009-11-12 20:01:33Z alexander $
*/
/** Zend_Search_Lucene_Search_QueryToken */
require_once 'Zend/Search/Lucene/Search/QueryToken.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_QueryParserContext
{
/**
* Default field for the context.
*
* null means, that term should be searched through all fields
* Zend_Search_Lucene_Search_Query::rewriteQuery($index) transletes such queries to several
*
* @var string|null
*/
private $_defaultField;
/**
* Field specified for next entry
*
* @var string
*/
private $_nextEntryField = null;
/**
* True means, that term is required.
* False means, that term is prohibited.
* null means, that term is neither prohibited, nor required
*
* @var boolean
*/
private $_nextEntrySign = null;
/**
* Entries grouping mode
*/
const GM_SIGNS = 0; // Signs mode: '+term1 term2 -term3 +(subquery1) -(subquery2)'
const GM_BOOLEAN = 1; // Boolean operators mode: 'term1 and term2 or (subquery1) and not (subquery2)'
/**
* Grouping mode
*
* @var integer
*/
private $_mode = null;
/**
* Entries signs.
* Used in GM_SIGNS grouping mode
*
* @var arrays
*/
private $_signs = array();
/**
* Query entries
* Each entry is a Zend_Search_Lucene_Search_QueryEntry object or
* boolean operator (Zend_Search_Lucene_Search_QueryToken class constant)
*
* @var array
*/
private $_entries = array();
/**
* Query string encoding
*
* @var string
*/
private $_encoding;
/**
* Context object constructor
*
* @param string $encoding
* @param string|null $defaultField
*/
public function __construct($encoding, $defaultField = null)
{
$this->_encoding = $encoding;
$this->_defaultField = $defaultField;
}
/**
* Get context default field
*
* @return string|null
*/
public function getField()
{
return ($this->_nextEntryField !== null) ? $this->_nextEntryField : $this->_defaultField;
}
/**
* Set field for next entry
*
* @param string $field
*/
public function setNextEntryField($field)
{
$this->_nextEntryField = $field;
}
/**
* Set sign for next entry
*
* @param integer $sign
* @throws Zend_Search_Lucene_Exception
*/
public function setNextEntrySign($sign)
{
if ($this->_mode === self::GM_BOOLEAN) {
require_once 'Zend/Search/Lucene/Search/QueryParserException.php';
throw new Zend_Search_Lucene_Search_QueryParserException('It\'s not allowed to mix boolean and signs styles in the same subquery.');
}
$this->_mode = self::GM_SIGNS;
if ($sign == Zend_Search_Lucene_Search_QueryToken::TT_REQUIRED) {
$this->_nextEntrySign = true;
} else if ($sign == Zend_Search_Lucene_Search_QueryToken::TT_PROHIBITED) {
$this->_nextEntrySign = false;
} else {
require_once 'Zend/Search/Lucene/Exception.php';
throw new Zend_Search_Lucene_Exception('Unrecognized sign type.');
}
}
/**
* Add entry to a query
*
* @param Zend_Search_Lucene_Search_QueryEntry $entry
*/
public function addEntry(Zend_Search_Lucene_Search_QueryEntry $entry)
{
if ($this->_mode !== self::GM_BOOLEAN) {
$this->_signs[] = $this->_nextEntrySign;
}
$this->_entries[] = $entry;
$this->_nextEntryField = null;
$this->_nextEntrySign = null;
}
/**
* Process fuzzy search or proximity search modifier
*
* @throws Zend_Search_Lucene_Search_QueryParserException
*/
public function processFuzzyProximityModifier($parameter = null)
{
// Check, that modifier has came just after word or phrase
if ($this->_nextEntryField !== null || $this->_nextEntrySign !== null) {
require_once 'Zend/Search/Lucene/Search/QueryParserException.php';
throw new Zend_Search_Lucene_Search_QueryParserException('\'~\' modifier must follow word or phrase.');
}
$lastEntry = array_pop($this->_entries);
if (!$lastEntry instanceof Zend_Search_Lucene_Search_QueryEntry) {
// there are no entries or last entry is boolean operator
require_once 'Zend/Search/Lucene/Search/QueryParserException.php';
throw new Zend_Search_Lucene_Search_QueryParserException('\'~\' modifier must follow word or phrase.');
}
$lastEntry->processFuzzyProximityModifier($parameter);
$this->_entries[] = $lastEntry;
}
/**
* Set boost factor to the entry
*
* @param float $boostFactor
*/
public function boost($boostFactor)
{
// Check, that modifier has came just after word or phrase
if ($this->_nextEntryField !== null || $this->_nextEntrySign !== null) {
require_once 'Zend/Search/Lucene/Search/QueryParserException.php';
throw new Zend_Search_Lucene_Search_QueryParserException('\'^\' modifier must follow word, phrase or subquery.');
}
$lastEntry = array_pop($this->_entries);
if (!$lastEntry instanceof Zend_Search_Lucene_Search_QueryEntry) {
// there are no entries or last entry is boolean operator
require_once 'Zend/Search/Lucene/Search/QueryParserException.php';
throw new Zend_Search_Lucene_Search_QueryParserException('\'^\' modifier must follow word, phrase or subquery.');
}
$lastEntry->boost($boostFactor);
$this->_entries[] = $lastEntry;
}
/**
* Process logical operator
*
* @param integer $operator
*/
public function addLogicalOperator($operator)
{
if ($this->_mode === self::GM_SIGNS) {
require_once 'Zend/Search/Lucene/Search/QueryParserException.php';
throw new Zend_Search_Lucene_Search_QueryParserException('It\'s not allowed to mix boolean and signs styles in the same subquery.');
}
$this->_mode = self::GM_BOOLEAN;
$this->_entries[] = $operator;
}
/**
* Generate 'signs style' query from the context
* '+term1 term2 -term3 +(<subquery1>) ...'
*
* @return Zend_Search_Lucene_Search_Query
*/
public function _signStyleExpressionQuery()
{
require_once 'Zend/Search/Lucene/Search/Query/Boolean.php';
$query = new Zend_Search_Lucene_Search_Query_Boolean();
require_once 'Zend/Search/Lucene/Search/QueryParser.php';
if (Zend_Search_Lucene_Search_QueryParser::getDefaultOperator() == Zend_Search_Lucene_Search_QueryParser::B_AND) {
$defaultSign = true; // required
} else {
// Zend_Search_Lucene_Search_QueryParser::B_OR
$defaultSign = null; // optional
}
foreach ($this->_entries as $entryId => $entry) {
$sign = ($this->_signs[$entryId] !== null) ? $this->_signs[$entryId] : $defaultSign;
$query->addSubquery($entry->getQuery($this->_encoding), $sign);
}
return $query;
}
/**
* Generate 'boolean style' query from the context
* 'term1 and term2 or term3 and (<subquery1>) and not (<subquery2>)'
*
* @return Zend_Search_Lucene_Search_Query
* @throws Zend_Search_Lucene
*/
private function _booleanExpressionQuery()
{
/**
* We treat each level of an expression as a boolean expression in
* a Disjunctive Normal Form
*
* AND operator has higher precedence than OR
*
* Thus logical query is a disjunction of one or more conjunctions of
* one or more query entries
*/
require_once 'Zend/Search/Lucene/Search/BooleanExpressionRecognizer.php';
$expressionRecognizer = new Zend_Search_Lucene_Search_BooleanExpressionRecognizer();
require_once 'Zend/Search/Lucene/Exception.php';
try {
foreach ($this->_entries as $entry) {
if ($entry instanceof Zend_Search_Lucene_Search_QueryEntry) {
$expressionRecognizer->processLiteral($entry);
} else {
switch ($entry) {
case Zend_Search_Lucene_Search_QueryToken::TT_AND_LEXEME:
$expressionRecognizer->processOperator(Zend_Search_Lucene_Search_BooleanExpressionRecognizer::IN_AND_OPERATOR);
break;
case Zend_Search_Lucene_Search_QueryToken::TT_OR_LEXEME:
$expressionRecognizer->processOperator(Zend_Search_Lucene_Search_BooleanExpressionRecognizer::IN_OR_OPERATOR);
break;
case Zend_Search_Lucene_Search_QueryToken::TT_NOT_LEXEME:
$expressionRecognizer->processOperator(Zend_Search_Lucene_Search_BooleanExpressionRecognizer::IN_NOT_OPERATOR);
break;
default:
throw new Zend_Search_Lucene('Boolean expression error. Unknown operator type.');
}
}
}
$conjuctions = $expressionRecognizer->finishExpression();
} catch (Zend_Search_Exception $e) {
// throw new Zend_Search_Lucene_Search_QueryParserException('Boolean expression error. Error message: \'' .
// $e->getMessage() . '\'.' );
// It's query syntax error message and it should be user friendly. So FSM message is omitted
require_once 'Zend/Search/Lucene/Search/QueryParserException.php';
throw new Zend_Search_Lucene_Search_QueryParserException('Boolean expression error.');
}
// Remove 'only negative' conjunctions
foreach ($conjuctions as $conjuctionId => $conjuction) {
$nonNegativeEntryFound = false;
foreach ($conjuction as $conjuctionEntry) {
if ($conjuctionEntry[1]) {
$nonNegativeEntryFound = true;
break;
}
}
if (!$nonNegativeEntryFound) {
unset($conjuctions[$conjuctionId]);
}
}
$subqueries = array();
foreach ($conjuctions as $conjuction) {
// Check, if it's a one term conjuction
if (count($conjuction) == 1) {
$subqueries[] = $conjuction[0][0]->getQuery($this->_encoding);
} else {
require_once 'Zend/Search/Lucene/Search/Query/Boolean.php';
$subquery = new Zend_Search_Lucene_Search_Query_Boolean();
foreach ($conjuction as $conjuctionEntry) {
$subquery->addSubquery($conjuctionEntry[0]->getQuery($this->_encoding), $conjuctionEntry[1]);
}
$subqueries[] = $subquery;
}
}
if (count($subqueries) == 0) {
require_once 'Zend/Search/Lucene/Search/Query/Insignificant.php';
return new Zend_Search_Lucene_Search_Query_Insignificant();
}
if (count($subqueries) == 1) {
return $subqueries[0];
}
require_once 'Zend/Search/Lucene/Search/Query/Boolean.php';
$query = new Zend_Search_Lucene_Search_Query_Boolean();
foreach ($subqueries as $subquery) {
// Non-requirered entry/subquery
$query->addSubquery($subquery);
}
return $query;
}
/**
* Generate query from current context
*
* @return Zend_Search_Lucene_Search_Query
*/
public function getQuery()
{
if ($this->_mode === self::GM_BOOLEAN) {
return $this->_booleanExpressionQuery();
} else {
return $this->_signStyleExpressionQuery();
}
}
}
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