Code Coverage |
||||||||||
Lines |
Functions and Methods |
Classes and Traits |
||||||||
| Total | |
100.00% |
136 / 136 |
|
100.00% |
30 / 30 |
CRAP | |
100.00% |
1 / 1 |
| AnalyzerBuilder | |
100.00% |
136 / 136 |
|
100.00% |
30 / 30 |
50 | |
100.00% |
1 / 1 |
| __construct | |
100.00% |
2 / 2 |
|
100.00% |
1 / 1 |
1 | |||
| withCharFilters | |
100.00% |
2 / 2 |
|
100.00% |
1 / 1 |
1 | |||
| withTokenizer | |
100.00% |
2 / 2 |
|
100.00% |
1 / 1 |
1 | |||
| withFilters | |
100.00% |
2 / 2 |
|
100.00% |
1 / 1 |
1 | |||
| withCharMap | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withNumberCharFilter | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withElision | |
100.00% |
4 / 4 |
|
100.00% |
1 / 1 |
1 | |||
| withLangLowercase | |
100.00% |
2 / 2 |
|
100.00% |
1 / 1 |
1 | |||
| withStop | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withStemmerOverride | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withUnpackedAnalyzer | |
100.00% |
2 / 2 |
|
100.00% |
1 / 1 |
1 | |||
| unpackedCheck | |
100.00% |
4 / 4 |
|
100.00% |
1 / 1 |
2 | |||
| insertFiltersBefore | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| omitDottedI | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withWordBreakHelper | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withAggressiveSplitting | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withLightStemmer | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| omitStemmer | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withAsciifoldingPreserve | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| omitAsciifolding | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withRemoveEmpty | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| withDecimalDigit | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
1 | |||
| build | |
100.00% |
61 / 61 |
|
100.00% |
1 / 1 |
18 | |||
| patternFilter | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| mappingCharFilter | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| numberCharFilter | |
100.00% |
4 / 4 |
|
100.00% |
1 / 1 |
2 | |||
| elisionFilter | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| stopFilterFromList | |
100.00% |
4 / 4 |
|
100.00% |
1 / 1 |
2 | |||
| overrideFilter | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| stemmerFilter | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Maintenance; |
| 4 | |
| 5 | /** |
| 6 | * Builds one elasticsearch analyzer to add to an analysis config array. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 21 | * http://www.gnu.org/copyleft/gpl.html |
| 22 | */ |
| 23 | class AnalyzerBuilder { |
| 24 | /** |
| 25 | * Indicate that filters should be automatically appended or prepended, rather |
| 26 | * than inserted before a given filter. |
| 27 | */ |
| 28 | public const APPEND = 1; |
| 29 | public const PREPEND = 2; |
| 30 | |
| 31 | /** @var string */ |
| 32 | private $langName; |
| 33 | |
| 34 | /** @var string */ |
| 35 | private $analyzerName; |
| 36 | |
| 37 | /** @var string[]|null list of char_filters */ |
| 38 | private $charFilters; |
| 39 | |
| 40 | /** @var string|null name of tokenizer */ |
| 41 | private $tokenizer = 'standard'; |
| 42 | |
| 43 | /** @var string[]|null list of filters */ |
| 44 | private $filters; |
| 45 | |
| 46 | /** @var string[]|null list of lang-specific character filter mappings */ |
| 47 | private $charMap; |
| 48 | |
| 49 | /** @var string|null */ |
| 50 | private $charMapName; |
| 51 | |
| 52 | /** @var int|null Unicode value for script-specific zero */ |
| 53 | private $langZero; |
| 54 | |
| 55 | /** @var string|null name of char filter mapping digits (using $langZero) */ |
| 56 | private $numCharMapName; |
| 57 | |
| 58 | /** @var bool is elision processing case INsensitive? */ |
| 59 | private $elisionArticleCase = true; |
| 60 | |
| 61 | /** @var string[]|null list of articles to elide */ |
| 62 | private $elisionArticles; |
| 63 | |
| 64 | /** @var string|null */ |
| 65 | private $elisionName; |
| 66 | |
| 67 | /** @var bool use language-specific lowercasing? */ |
| 68 | private $langLowercase = false; |
| 69 | |
| 70 | /** @var mixed|null stopword _list_ or array of stopwords */ |
| 71 | private $customStopList; |
| 72 | |
| 73 | /** @var string|null */ |
| 74 | private $stopName; |
| 75 | |
| 76 | /** @var string[]|null list of stemmer override rules */ |
| 77 | private $overrideRules; |
| 78 | |
| 79 | /** @var string|null */ |
| 80 | private $overrideName; |
| 81 | |
| 82 | /********** |
| 83 | * The properties below are only used by unpacked analyzers |
| 84 | */ |
| 85 | |
| 86 | /** @var bool */ |
| 87 | private $unpacked = false; |
| 88 | |
| 89 | /** @var array<int, array<string, string[]>> */ |
| 90 | private $insertFilterList = []; |
| 91 | |
| 92 | /** @var string */ |
| 93 | private $dottedIFix = 'dotted_I_fix'; |
| 94 | |
| 95 | /** @var string|null */ |
| 96 | private $wordBreakHelper; |
| 97 | |
| 98 | /** @var string|null */ |
| 99 | private $aggressiveSplitting; |
| 100 | |
| 101 | /** @var bool */ |
| 102 | private $useStemmer = true; |
| 103 | |
| 104 | /** @var string|null */ |
| 105 | private $stemmerName; |
| 106 | |
| 107 | /** @var string|null asciifolding flavor to use (null for none) */ |
| 108 | private $asciifolding = 'asciifolding'; |
| 109 | |
| 110 | /** @var string|null */ |
| 111 | private $removeEmpty; |
| 112 | |
| 113 | /** @var string|null */ |
| 114 | private $decimalDigit; |
| 115 | |
| 116 | /** |
| 117 | * @param string $langName |
| 118 | * @param string $analyzerName (default to 'text') |
| 119 | */ |
| 120 | public function __construct( string $langName, string $analyzerName = 'text' ) { |
| 121 | $this->langName = $langName; |
| 122 | $this->analyzerName = $analyzerName; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * @param string[] $charFilters |
| 127 | * @return self |
| 128 | */ |
| 129 | public function withCharFilters( array $charFilters ): self { |
| 130 | $this->charFilters = $charFilters; |
| 131 | return $this; |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * @param string $tokenizer |
| 136 | * @return self |
| 137 | */ |
| 138 | public function withTokenizer( string $tokenizer ): self { |
| 139 | $this->tokenizer = $tokenizer; |
| 140 | return $this; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * @param string[] $filters |
| 145 | * @return self |
| 146 | */ |
| 147 | public function withFilters( array $filters ): self { |
| 148 | $this->filters = $filters; |
| 149 | return $this; |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * @param string[] $mappings |
| 154 | * @return self |
| 155 | */ |
| 156 | public function withCharMap( array $mappings ): self { |
| 157 | $this->charMap = $mappings; |
| 158 | $this->charMapName = "{$this->langName}_charfilter"; |
| 159 | return $this; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * @param int $langZero |
| 164 | * @return self |
| 165 | */ |
| 166 | public function withNumberCharFilter( int $langZero ): self { |
| 167 | $this->langZero = $langZero; |
| 168 | $this->numCharMapName = "{$this->langName}_numbers"; |
| 169 | return $this; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * @param string[] $articles "articles" to be elided |
| 174 | * @param bool $articleCase whether elision is case insensitive |
| 175 | * @return self |
| 176 | */ |
| 177 | public function withElision( array $articles, bool $articleCase = true ): self { |
| 178 | $this->elisionArticleCase = $articleCase; |
| 179 | $this->elisionArticles = $articles; |
| 180 | $this->elisionName = "{$this->langName}_elision"; |
| 181 | return $this; |
| 182 | } |
| 183 | |
| 184 | /** @return self */ |
| 185 | public function withLangLowercase(): self { |
| 186 | $this->langLowercase = true; |
| 187 | return $this; |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * @param mixed $stop pre-defined list like _french_ or an array of stopwords |
| 192 | * @return self |
| 193 | */ |
| 194 | public function withStop( $stop ): self { |
| 195 | $this->customStopList = $stop; |
| 196 | $this->stopName = "{$this->langName}_stop"; |
| 197 | return $this; |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * @param string[] $rules stemmer override rules |
| 202 | * @return self |
| 203 | */ |
| 204 | public function withStemmerOverride( array $rules ): self { |
| 205 | $this->overrideRules = $rules; |
| 206 | $this->overrideName = "{$this->langName}_override"; |
| 207 | return $this; |
| 208 | } |
| 209 | |
| 210 | /********** |
| 211 | * The with.., omit.., and insert.. methods below are only used by unpacked analyzers |
| 212 | */ |
| 213 | |
| 214 | /** @return self */ |
| 215 | public function withUnpackedAnalyzer(): self { |
| 216 | $this->unpacked = true; |
| 217 | return $this; |
| 218 | } |
| 219 | |
| 220 | private function unpackedCheck(): void { |
| 221 | if ( !$this->unpacked ) { |
| 222 | $caller = debug_backtrace()[1]['function']; |
| 223 | throw new \ConfigException( "$caller() is only compatible with unpacked analyzers;" . |
| 224 | "call withUnpackedAnalyzer() before calling $caller()." ); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * @param mixed $beforeFilter specific filter to insert $filters before; use APPEND |
| 230 | * or PREPEND to always add to beginning or end of the list |
| 231 | * @param string[] $filterList list of additional filters to insert |
| 232 | * @return self |
| 233 | */ |
| 234 | public function insertFiltersBefore( $beforeFilter, array $filterList ): self { |
| 235 | $this->unpackedCheck(); |
| 236 | $this->insertFilterList[] = [ $beforeFilter => $filterList ]; |
| 237 | return $this; |
| 238 | } |
| 239 | |
| 240 | /** @return self */ |
| 241 | public function omitDottedI(): self { |
| 242 | $this->unpackedCheck(); |
| 243 | $this->dottedIFix = ''; |
| 244 | return $this; |
| 245 | } |
| 246 | |
| 247 | /** @return self */ |
| 248 | public function withWordBreakHelper(): self { |
| 249 | $this->unpackedCheck(); |
| 250 | $this->wordBreakHelper = 'word_break_helper'; |
| 251 | return $this; |
| 252 | } |
| 253 | |
| 254 | /** @return self */ |
| 255 | public function withAggressiveSplitting(): self { |
| 256 | $this->unpackedCheck(); |
| 257 | $this->aggressiveSplitting = 'aggressive_splitting'; |
| 258 | return $this; |
| 259 | } |
| 260 | |
| 261 | /** @return self */ |
| 262 | public function withLightStemmer(): self { |
| 263 | $this->unpackedCheck(); |
| 264 | $this->stemmerName = "light_{$this->langName}"; |
| 265 | return $this; |
| 266 | } |
| 267 | |
| 268 | /** @return self */ |
| 269 | public function omitStemmer(): self { |
| 270 | $this->unpackedCheck(); |
| 271 | $this->useStemmer = false; |
| 272 | return $this; |
| 273 | } |
| 274 | |
| 275 | /** @return self */ |
| 276 | public function withAsciifoldingPreserve(): self { |
| 277 | $this->unpackedCheck(); |
| 278 | $this->asciifolding = 'asciifolding_preserve'; |
| 279 | return $this; |
| 280 | } |
| 281 | |
| 282 | /** @return self */ |
| 283 | public function omitAsciifolding(): self { |
| 284 | $this->unpackedCheck(); |
| 285 | $this->asciifolding = ''; |
| 286 | return $this; |
| 287 | } |
| 288 | |
| 289 | /** @return self */ |
| 290 | public function withRemoveEmpty(): self { |
| 291 | $this->unpackedCheck(); |
| 292 | $this->removeEmpty = 'remove_empty'; |
| 293 | return $this; |
| 294 | } |
| 295 | |
| 296 | /** @return self */ |
| 297 | public function withDecimalDigit(): self { |
| 298 | $this->unpackedCheck(); |
| 299 | $this->decimalDigit = 'decimal_digit'; |
| 300 | return $this; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * Create a basic analyzer with support for various common options |
| 305 | * |
| 306 | * Can create various filters and character filters as specified. |
| 307 | * None are automatically added to the char_filter or filter list |
| 308 | * because the best order for these basic analyzers depends on the |
| 309 | * details of various third-party plugins. |
| 310 | * |
| 311 | * type: custom |
| 312 | * tokenizer: standard |
| 313 | * char_filter: as per $this->charFilters |
| 314 | * filter: as per $this->filters |
| 315 | * |
| 316 | * @param mixed[] $config to be updated |
| 317 | * @return mixed[] updated config |
| 318 | */ |
| 319 | public function build( array $config ): array { |
| 320 | $langStem = "{$this->langName}_stemmer"; |
| 321 | |
| 322 | if ( $this->unpacked ) { |
| 323 | // Analyzer config for char_filter and filter will be in the order below, |
| 324 | // if the relevant filters are enabled/configured. |
| 325 | // |
| 326 | // type: custom |
| 327 | // tokenizer: standard |
| 328 | // char_filter: dotted_I_fix, lang_charfilter, lang_numbers, word_break_helper |
| 329 | // filter: elision, aggressive_splitting, lowercase, stopwords, lang_norm, |
| 330 | // stemmer_override, stemmer, asciifolding, remove_empty |
| 331 | if ( $this->useStemmer ) { |
| 332 | $this->stemmerName = $this->stemmerName ?? $this->langName; |
| 333 | } else { |
| 334 | $langStem = ''; |
| 335 | } |
| 336 | $this->withStop( $this->customStopList ?? "_{$this->langName}_" ); |
| 337 | |
| 338 | // build up the char_filter list--everything is optional |
| 339 | $this->charFilters[] = $this->dottedIFix; |
| 340 | $this->charFilters[] = $this->charMapName; |
| 341 | $this->charFilters[] = $this->numCharMapName; |
| 342 | $this->charFilters[] = $this->wordBreakHelper; |
| 343 | |
| 344 | // remove 'falsey' (== not configured) values from the list |
| 345 | $this->charFilters = array_values( array_filter( $this->charFilters ) ); |
| 346 | |
| 347 | // build up the filter list--lowercase, stop, and stem are required |
| 348 | $this->filters[] = $this->elisionName; |
| 349 | $this->filters[] = $this->aggressiveSplitting; |
| 350 | $this->filters[] = 'lowercase'; |
| 351 | $this->filters[] = $this->decimalDigit; |
| 352 | $this->filters[] = $this->stopName; |
| 353 | $this->filters[] = $this->overrideName; |
| 354 | $this->filters[] = $langStem; |
| 355 | $this->filters[] = $this->asciifolding; |
| 356 | $this->filters[] = $this->removeEmpty; |
| 357 | |
| 358 | // remove 'falsey' (== not configured) values from the list |
| 359 | $this->filters = array_values( array_filter( $this->filters ) ); |
| 360 | |
| 361 | // iterate over all lists of sets of filters to insert, in order, and insert |
| 362 | // them before the specified filter. If no such filter exists, $idx == -1 and |
| 363 | // the filters will be prepended, but you shouldn't count on that. APPEND and |
| 364 | // PREPEND constants can be used to add to beginning or end, regardless of |
| 365 | // other filters |
| 366 | foreach ( $this->insertFilterList as $filterPatch ) { |
| 367 | foreach ( $filterPatch as $beforeFilter => $filterList ) { |
| 368 | switch ( $beforeFilter ) { |
| 369 | case self::APPEND: |
| 370 | $this->filters = array_merge( $this->filters, $filterList ); |
| 371 | break; |
| 372 | case self::PREPEND: |
| 373 | $this->filters = array_merge( $filterList, $this->filters ); |
| 374 | break; |
| 375 | default: |
| 376 | $idx = array_search( $beforeFilter, $this->filters ); |
| 377 | array_splice( $this->filters, $idx, 0, $filterList ); |
| 378 | break; |
| 379 | } |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | } |
| 384 | |
| 385 | $config[ 'analyzer' ][ $this->analyzerName ] = [ |
| 386 | 'type' => 'custom', |
| 387 | 'tokenizer' => $this->tokenizer, |
| 388 | ]; |
| 389 | |
| 390 | if ( $this->charMapName ) { |
| 391 | $config[ 'char_filter' ][ $this->charMapName ] = |
| 392 | $this->mappingCharFilter( $this->charMap ); |
| 393 | } |
| 394 | |
| 395 | if ( $this->numCharMapName ) { |
| 396 | $config[ 'char_filter' ][ $this->numCharMapName ] = |
| 397 | $this->numberCharFilter( $this->langZero ); |
| 398 | } |
| 399 | |
| 400 | if ( $this->elisionName ) { |
| 401 | $config[ 'filter' ][ $this->elisionName ] = |
| 402 | $this->elisionFilter( $this->elisionArticles, $this->elisionArticleCase ); |
| 403 | } |
| 404 | |
| 405 | if ( $this->langLowercase ) { |
| 406 | $config[ 'filter' ][ 'lowercase' ][ 'language' ] = $this->langName; |
| 407 | } |
| 408 | |
| 409 | if ( $this->overrideName ) { |
| 410 | $config[ 'filter' ][ $this->overrideName ] = |
| 411 | $this->overrideFilter( $this->overrideRules ); |
| 412 | } |
| 413 | |
| 414 | if ( $this->stopName ) { |
| 415 | $config[ 'filter' ][ $this->stopName ] = |
| 416 | $this->stopFilterFromList( $this->customStopList ); |
| 417 | } |
| 418 | |
| 419 | if ( $this->charFilters ) { |
| 420 | $config[ 'analyzer' ][ $this->analyzerName ][ 'char_filter' ] = $this->charFilters; |
| 421 | } |
| 422 | |
| 423 | if ( $this->filters ) { |
| 424 | $config[ 'analyzer' ][ $this->analyzerName ][ 'filter' ] = $this->filters; |
| 425 | } |
| 426 | |
| 427 | if ( $this->stemmerName && $this->useStemmer ) { |
| 428 | $config[ 'filter' ][ $langStem ] = |
| 429 | $this->stemmerFilter( $this->stemmerName ); |
| 430 | } |
| 431 | |
| 432 | return $config; |
| 433 | } |
| 434 | |
| 435 | /** |
| 436 | * Create a pattern_replace filter/char_filter with the mappings provided. |
| 437 | * |
| 438 | * @param string $pat |
| 439 | * @param string $repl |
| 440 | * @return mixed[] filter |
| 441 | */ |
| 442 | public static function patternFilter( string $pat, string $repl ): array { |
| 443 | return [ 'type' => 'pattern_replace', 'pattern' => $pat, 'replacement' => $repl ]; |
| 444 | } |
| 445 | |
| 446 | /** |
| 447 | * Create a mapping character filter with the mappings provided. |
| 448 | * |
| 449 | * @param string[] $mappings |
| 450 | * @return mixed[] character filter |
| 451 | */ |
| 452 | public static function mappingCharFilter( array $mappings ): array { |
| 453 | return [ 'type' => 'mapping', 'mappings' => $mappings ]; |
| 454 | } |
| 455 | |
| 456 | /** |
| 457 | * Create a character filter that maps non-Arabic digits (e.g., ០-៩ or ０-９) to |
| 458 | * Arabic digits (0-9). Since they are usually all in a row, we just need the |
| 459 | * starting digit (equal to 0) |
| 460 | * |
| 461 | * @param int $langZero |
| 462 | * @return mixed[] character filter |
| 463 | */ |
| 464 | public static function numberCharFilter( int $langZero ): array { |
| 465 | $numMap = []; |
| 466 | for ( $i = 0; $i <= 9; $i++ ) { |
| 467 | $numMap[] = sprintf( '\\u%04x=>%d', $langZero + $i, $i ); |
| 468 | } |
| 469 | return self::mappingCharFilter( $numMap ); |
| 470 | } |
| 471 | |
| 472 | /** |
| 473 | * Create an elision filter with the "articles" provided; $case determines whether |
| 474 | * stripping is case sensitive or not |
| 475 | * |
| 476 | * @param string[] $articles |
| 477 | * @param bool $case |
| 478 | * @return mixed[] token filter |
| 479 | */ |
| 480 | public static function elisionFilter( array $articles, bool $case = true ): array { |
| 481 | return [ 'type' => 'elision', 'articles_case' => $case, 'articles' => $articles ]; |
| 482 | } |
| 483 | |
| 484 | /** |
| 485 | * Create a stop word filter with the provided config. The config can be an array |
| 486 | * of stop words, or a string like _french_ that refers to a pre-defined list. |
| 487 | * |
| 488 | * @param mixed $stopwords |
| 489 | * @param bool|null $ignoreCase |
| 490 | * @return mixed[] token filter |
| 491 | */ |
| 492 | public static function stopFilterFromList( $stopwords, bool $ignoreCase = null ): array { |
| 493 | $retArray = [ 'type' => 'stop', 'stopwords' => $stopwords ]; |
| 494 | if ( isset( $ignoreCase ) ) { |
| 495 | $retArray['ignore_case'] = $ignoreCase; |
| 496 | } |
| 497 | return $retArray; |
| 498 | } |
| 499 | |
| 500 | /** |
| 501 | * Create an stemming override filter with the rules provided |
| 502 | * |
| 503 | * @param string[] $rules |
| 504 | * @return mixed[] token filter |
| 505 | */ |
| 506 | private function overrideFilter( array $rules ): array { |
| 507 | return [ 'type' => 'stemmer_override', 'rules' => $rules ]; |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | * Create a stemmer filter with the provided config. |
| 512 | * |
| 513 | * @param string $stemmer |
| 514 | * @return mixed[] token filter |
| 515 | */ |
| 516 | public static function stemmerFilter( string $stemmer ): array { |
| 517 | return [ 'type' => 'stemmer', 'language' => $stemmer ]; |
| 518 | } |
| 519 | |
| 520 | } |