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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\WikiLambda\ActionAPI; |
| 4 | |
| 5 | use MediaWiki\Api\ApiPageSet; |
| 6 | use MediaWiki\Api\ApiQueryGeneratorBase; |
| 7 | use MediaWiki\Extension\WikiLambda\HttpStatus; |
| 8 | use MediaWiki\Extension\WikiLambda\Registry\ZErrorTypeRegistry; |
| 9 | use MediaWiki\Extension\WikiLambda\ZErrorFactory; |
| 10 | use MediaWiki\Extension\WikiLambda\ZObjectUtils; |
| 11 | use Psr\Log\LoggerAwareInterface; |
| 12 | use Psr\Log\LoggerInterface; |
| 13 | |
| 14 | /** |
| 15 | * WikiLambda Query Generator Base API util |
| 16 | * |
| 17 | * This abstract class extends the Wikimedia's ApiBase class |
| 18 | * and provides specific additional methods. |
| 19 | * |
| 20 | * @stable to extend |
| 21 | * |
| 22 | * @ingroup API |
| 23 | * @copyright 2020– Abstract Wikipedia team; see AUTHORS.txt |
| 24 | * @license MIT |
| 25 | */ |
| 26 | abstract class WikiLambdaApiQueryGeneratorBase extends ApiQueryGeneratorBase implements LoggerAwareInterface { |
| 27 | |
| 28 | protected LoggerInterface $logger; |
| 29 | |
| 30 | /** |
| 31 | * @inheritDoc |
| 32 | */ |
| 33 | public function execute() { |
| 34 | // Exit if we're running in non-repo mode (e.g. on a client wiki) |
| 35 | if ( !$this->getConfig()->get( 'WikiLambdaEnableRepoMode' ) ) { |
| 36 | WikiLambdaApiBase::dieWithZError( |
| 37 | ZErrorFactory::createZErrorInstance( |
| 38 | ZErrorTypeRegistry::Z_ERROR_USER_CANNOT_RUN, |
| 39 | [] |
| 40 | ), |
| 41 | HttpStatus::BAD_REQUEST |
| 42 | ); |
| 43 | } |
| 44 | |
| 45 | $this->run( null ); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * @inheritDoc |
| 50 | */ |
| 51 | public function executeGenerator( $resultPageSet ) { |
| 52 | // Exit if we're running in non-repo mode (e.g. on a client wiki) |
| 53 | if ( !$this->getConfig()->get( 'WikiLambdaEnableRepoMode' ) ) { |
| 54 | WikiLambdaApiBase::dieWithZError( |
| 55 | ZErrorFactory::createZErrorInstance( |
| 56 | ZErrorTypeRegistry::Z_ERROR_USER_CANNOT_RUN, |
| 57 | [] |
| 58 | ), |
| 59 | HttpStatus::BAD_REQUEST |
| 60 | ); |
| 61 | } |
| 62 | |
| 63 | $this->run( $resultPageSet ); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * @param ApiPageSet|null $resultPageSet |
| 68 | */ |
| 69 | protected function run( $resultPageSet ) { |
| 70 | // Throw, not implemented |
| 71 | WikiLambdaApiBase::dieWithZError( |
| 72 | ZErrorFactory::createZErrorInstance( |
| 73 | ZErrorTypeRegistry::Z_ERROR_UNKNOWN, |
| 74 | [ 'message' => 'You must implement your run() method when using WikiLambdaApiBase' ] |
| 75 | ), |
| 76 | HttpStatus::NOT_IMPLEMENTED |
| 77 | ); |
| 78 | } |
| 79 | |
| 80 | /** @inheritDoc */ |
| 81 | public function setLogger( LoggerInterface $logger ): void { |
| 82 | $this->logger = $logger; |
| 83 | } |
| 84 | |
| 85 | /** @inheritDoc */ |
| 86 | public function getLogger(): LoggerInterface { |
| 87 | return $this->logger; |
| 88 | } |
| 89 | |
| 90 | private const PREFIX_BOOST_FACTOR = 1.5; |
| 91 | private const POSITION_WEIGHT_FACTOR = 3.5; |
| 92 | private const COVERAGE_FACTOR = 0.3; |
| 93 | |
| 94 | /** |
| 95 | * Return the float match rate between a substring and the returned hit. |
| 96 | * The match rate is an aggregation of the match rates of each substring token. |
| 97 | * |
| 98 | * @param string $substring |
| 99 | * @param string $hit |
| 100 | * @param bool $exact |
| 101 | * @return float |
| 102 | */ |
| 103 | protected static function getMatchRate( $substring, $hit, $exact = false ) { |
| 104 | if ( !$exact ) { |
| 105 | $substring = ZObjectUtils::comparableString( $substring ); |
| 106 | $hit = ZObjectUtils::comparableString( $hit ); |
| 107 | } |
| 108 | |
| 109 | // Try match rate of full search term if substring is part of the hit |
| 110 | if ( strpos( $hit, $substring ) !== false ) { |
| 111 | return self::getSubstringMatchRate( $substring, $hit ); |
| 112 | } |
| 113 | |
| 114 | // Tokenize substring and calculate match rate for each token |
| 115 | $tokens = preg_split( '/\s+/', trim( $substring ), -1, PREG_SPLIT_NO_EMPTY ); |
| 116 | if ( count( $tokens ) === 0 ) { |
| 117 | return 0.0; |
| 118 | } |
| 119 | |
| 120 | $weightedSum = 0; |
| 121 | $totalWeight = 0; |
| 122 | $matchedTokens = 0; |
| 123 | |
| 124 | // Aggregate weighted token's rates |
| 125 | foreach ( $tokens as $index => $token ) { |
| 126 | $rate = self::getSubstringMatchRate( $token, $hit ); |
| 127 | |
| 128 | // Count number of matched tokens to promote full token coverate |
| 129 | if ( $rate > 0 ) { |
| 130 | $matchedTokens++; |
| 131 | } |
| 132 | |
| 133 | // Boost if first token matches the first characters of the hit |
| 134 | if ( $index === 0 && strpos( $hit, $token ) === 0 ) { |
| 135 | $rate = min( 1.0, $rate * self::PREFIX_BOOST_FACTOR ); |
| 136 | } |
| 137 | |
| 138 | // Weight by token length |
| 139 | $lengthWeight = strlen( $token ); |
| 140 | // Weight by token position |
| 141 | $positionWeight = ( 1 / ( $index + 1 ) ) * self::POSITION_WEIGHT_FACTOR; |
| 142 | // Combined weights |
| 143 | $weight = $lengthWeight + $positionWeight; |
| 144 | |
| 145 | $weightedSum += $rate * $weight; |
| 146 | $totalWeight += $weight; |
| 147 | } |
| 148 | |
| 149 | $baseScore = ( $weightedSum / $totalWeight ) * ( 1 - self::COVERAGE_FACTOR ); |
| 150 | $coverageScore = ( $matchedTokens / count( $tokens ) ) * self::COVERAGE_FACTOR; |
| 151 | |
| 152 | return $baseScore + $coverageScore; |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Calculates the float match rate between a substring token and the returned hit. |
| 157 | * The match rate is calculated considering: |
| 158 | * * Levenshtein distance |
| 159 | * * Position score |
| 160 | * |
| 161 | * @param string $substring |
| 162 | * @param string $hit |
| 163 | * @return float |
| 164 | */ |
| 165 | private static function getSubstringMatchRate( $substring, $hit ) { |
| 166 | // Zero score if token not present at all |
| 167 | if ( strpos( $hit, $substring ) === false ) { |
| 168 | return 0.0; |
| 169 | } |
| 170 | |
| 171 | // Calculate the base match rate with the Levenshtein distance |
| 172 | $distance = levenshtein( $substring, $hit ); |
| 173 | $max = max( strlen( $substring ), strlen( $hit ) ); |
| 174 | $baseMatchRate = ( $max - $distance ) / $max; |
| 175 | |
| 176 | // Find the position of the substring in the hit |
| 177 | $position = strpos( $hit, $substring ); |
| 178 | |
| 179 | // Normalize the position to a score (earlier positions get higher weight) |
| 180 | $positionScore = 1 - ( $position / strlen( $hit ) ); |
| 181 | |
| 182 | // Combine the base match rate and position score |
| 183 | return $baseMatchRate * 0.5 + $positionScore * 0.5; |
| 184 | } |
| 185 | } |