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|
<?php
namespace SMW\Query;
/**
* @license GNU GPL v2+
* @since 1.5.3
*
* @author mwjames
* @author Jeroen De Dauw
*/
class QueryComparator {
/**
* @var QueryComparator
*/
private static $instance = null;
/**
* @var array
*/
private $comparators = null;
/**
* @var array
*/
private $reverseCache = [];
/**
* @since 2.3
*
* @param string $comparatorList
* @param boolean $strictComparators
*/
public function __construct( $comparatorList, $strictComparators ) {
$this->comparators = $this->getEnabledComparators( $comparatorList, $strictComparators );
}
/**
* @since 2.3
*
* @return self
*/
public static function getInstance() {
if ( self::$instance === null ) {
self::$instance = new self(
$GLOBALS['smwgQComparators'],
$GLOBALS['smwStrictComparators']
);
}
return self::$instance;
}
/**
* @since 2.3
*/
public static function clear() {
self::$instance = null;
}
/**
* Gets an array with all supported comparator strings.
* The string for SMW_CMP_EQ, which is an empty string, is not in this list.
*
* @since 1.5.3
*
* @return array
*/
public function getComparatorStrings() {
return array_keys( $this->comparators );
}
/**
* Gets the SMW_CMP_ for a string comparator, falling back to the
* $defaultComparator when none is found.
*
* @since 1.5.3
*
* @param string $string
* @param integer $defaultComparator Item of the SMW_CMP_ enum
*
* @return integer Item of the SMW_CMP_ enum
*/
public function getComparatorFromString( $string, $defaultComparator = SMW_CMP_EQ ) {
if ( $string === '' ) {
return SMW_CMP_EQ;
}
return array_key_exists( $string, $this->comparators ) ? $this->comparators[$string] : $defaultComparator;
}
/**
* @since 2.5
*
* @param string $value
* @param integer $comparator
*
* @return boolean
*/
public function containsComparator( $value, $comparator = SMW_CMP_EQ ) {
return $this->extractComparatorFromString( $value ) === $comparator;
}
/**
* Extract possible comparators from a value and alter it to consist
* only of the remaining effective value string (without the comparator).
*
* @since 2.4
*
* @param $value
*
* @return integer
*/
public function extractComparatorFromString( &$value ) {
$comparator = SMW_CMP_EQ;
foreach ( $this->getComparatorStrings() as $string ) {
if ( strpos( $value, $string ) === 0 ) {
$comparator = $this->getComparatorFromString( substr( $value, 0, strlen( $string ) ) );
$value = substr( $value, strlen( $string ) );
break;
}
}
return $comparator;
}
/**
* Gets the comparator string for a comparator.
*
* @since 1.5.3
*
* @param $comparator
*
* @return string
*/
public function getStringForComparator( $comparator ) {
if ( $this->reverseCache === [] ) {
$this->reverseCache = array_flip( $this->comparators );
}
if ( $comparator == SMW_CMP_EQ ) {
return '';
} elseif ( array_key_exists( $comparator, $this->reverseCache ) ) {
return $this->reverseCache[$comparator];
}
throw new Exception( "Comparator $comparator does not have a string representatation" );
}
private function getEnabledComparators( $comparatorList, $strictComparators ) {
// Note: Comparators that contain other comparators at the beginning of
// the string need to be at beginning of the array.
$comparators = [
'like:' => SMW_CMP_PRIM_LIKE,
'nlike:' => SMW_CMP_PRIM_NLKE,
'in:' => SMW_CMP_IN,
'not:' => SMW_CMP_NOT,
'phrase:' => SMW_CMP_PHRASE,
'!~' => SMW_CMP_NLKE,
'<<' => SMW_CMP_LESS,
'>>' => SMW_CMP_GRTR,
'<' => $strictComparators ? SMW_CMP_LESS : SMW_CMP_LEQ,
'>' => $strictComparators ? SMW_CMP_GRTR : SMW_CMP_GEQ,
'≤' => SMW_CMP_LEQ,
'≥' => SMW_CMP_GEQ,
'!' => SMW_CMP_NEQ,
'~' => SMW_CMP_LIKE,
];
if ( strpos( $comparatorList, '|' ) === false ) {
return $comparators;
}
$allowedComparators = explode( '|', $comparatorList );
// Remove the comparators that are not allowed.
foreach ( $comparators as $string => $comparator ) {
if ( !in_array( $string, $allowedComparators ) ) {
unset( $comparators[$string] );
}
}
return $comparators;
}
}
|
