| Index: trunk/extensions/SemanticMediaWiki/includes/SMW_QueryLanguage.php |
| — | — | @@ -0,0 +1,106 @@ |
| | 2 | +<?php |
| | 3 | + |
| | 4 | +/** |
| | 5 | + * Static class for functions related to the SMW query language. |
| | 6 | + * |
| | 7 | + * @since 1.5.3 |
| | 8 | + * |
| | 9 | + * @file SMW_QueryLanguage.php |
| | 10 | + * @ingroup SMW |
| | 11 | + * |
| | 12 | + * @author Jeroen De Dauw |
| | 13 | + */ |
| | 14 | +final class SMWQueryLanguage { |
| | 15 | + |
| | 16 | + /** |
| | 17 | + * Associative array that maps the comparator strings (keys) to |
| | 18 | + * the SMW_CMP_ enum (values). Call initializeComparators before using. |
| | 19 | + * |
| | 20 | + * @since 1.5.3 |
| | 21 | + * |
| | 22 | + * @var array |
| | 23 | + */ |
| | 24 | + protected static $comparators = array(); |
| | 25 | + |
| | 26 | + /** |
| | 27 | + * Gets the SMW_CMP_ for a string comparator, falling back to the |
| | 28 | + * $defaultComparator when none is found. |
| | 29 | + * |
| | 30 | + * @since 1.5.3 |
| | 31 | + * |
| | 32 | + * @param string $string |
| | 33 | + * @param integer $defaultComparator Item of the SMW_CMP_ enum |
| | 34 | + * |
| | 35 | + * @return integer Item of the SMW_CMP_ enum |
| | 36 | + */ |
| | 37 | + public static function getComparatorFromString( $string, $defaultComparator = SMW_CMP_EQ ) { |
| | 38 | + self::initializeComparators(); |
| | 39 | + return array_key_exists( $string, self::$comparators ) ? self::$comparators[$string] : $defaultComparator; |
| | 40 | + } |
| | 41 | + |
| | 42 | + /** |
| | 43 | + * Gets the comparator string for a comparator. |
| | 44 | + * |
| | 45 | + * @since 1.5.3 |
| | 46 | + * |
| | 47 | + * @param $comparator |
| | 48 | + * |
| | 49 | + * @return string |
| | 50 | + */ |
| | 51 | + public static function getStringForComparator( $comparator ) { |
| | 52 | + self::initializeComparators(); |
| | 53 | + static $reverseCache = false; |
| | 54 | + |
| | 55 | + if ( $reverseCache === false ) { |
| | 56 | + $reverseCache = array_reverse( self::$comparators ); |
| | 57 | + } |
| | 58 | + |
| | 59 | + if ( array_key_exists( $comparator, $reverseCache ) ) { |
| | 60 | + return $reverseCache[$comparator]; |
| | 61 | + } |
| | 62 | + else { |
| | 63 | + throw new Exception( "Comparator $comparator does not have a string representatation" ); |
| | 64 | + } |
| | 65 | + } |
| | 66 | + |
| | 67 | + /** |
| | 68 | + * Initializes the $comparators field. |
| | 69 | + * |
| | 70 | + * @since 1.5.3 |
| | 71 | + */ |
| | 72 | + protected static function initializeComparators() { |
| | 73 | + global $smwgQComparators, $smwStrictComparators; |
| | 74 | + static $initialized = false; |
| | 75 | + |
| | 76 | + if ( $initialized ) { |
| | 77 | + return; |
| | 78 | + } |
| | 79 | + |
| | 80 | + $initialized = true; |
| | 81 | + |
| | 82 | + $comparators = array( |
| | 83 | + '' => SMW_CMP_EQ, |
| | 84 | + '<' => $smwStrictComparators ? SMW_CMP_LESS : SMW_CMP_LEQ, |
| | 85 | + '>' => $smwStrictComparators ? SMW_CMP_GRTR : SMW_CMP_GEQ, |
| | 86 | + '≤' => SMW_CMP_LEQ, |
| | 87 | + '≥' => SMW_CMP_GEQ, |
| | 88 | + '!' => SMW_CMP_NEQ, |
| | 89 | + '~' => SMW_CMP_LIKE, |
| | 90 | + '!~' => SMW_CMP_NLKE, |
| | 91 | + '<<' => SMW_CMP_LESS, |
| | 92 | + '>>' => SMW_CMP_GRTR, |
| | 93 | + ); |
| | 94 | + |
| | 95 | + $allowedComparators = explode( '|', $smwgQComparators ); |
| | 96 | + |
| | 97 | + // Remove the comparators that are not allowed. |
| | 98 | + foreach ( $comparators as $string => $comparator ) { |
| | 99 | + if ( !in_array( $string, $allowedComparators ) ) { |
| | 100 | + unset( $comparators[$string] ); |
| | 101 | + } |
| | 102 | + } |
| | 103 | + |
| | 104 | + self::$comparators = $comparators; |
| | 105 | + } |
| | 106 | + |
| | 107 | +} |
| Property changes on: trunk/extensions/SemanticMediaWiki/includes/SMW_QueryLanguage.php |
| ___________________________________________________________________ |
| Added: svn:eol-style |
| 1 | 108 | + native |