Пример #1
0
 public function stem($word)
 {
     $len = strlen($word);
     if ($len <= 2) {
         return $word;
     }
     //$word = lower_case($word);
     $r1 = $r2 = $rv = $len;
     //R1 is the region after the first non-vowel following a vowel, or is the null region at the end of the word if there is no such non-vowel.
     for ($i = 0; $i < $len - 1 && $r1 == $len; $i++) {
         if (es_stemmer::is_vowel($word[$i]) && !es_stemmer::is_vowel($word[$i + 1])) {
             $r1 = $i + 2;
         }
     }
     //R2 is the region after the first non-vowel following a vowel in R1, or is the null region at the end of the word if there is no such non-vowel.
     for ($i = $r1; $i < $len - 1 && $r2 == $len; $i++) {
         if (es_stemmer::is_vowel($word[$i]) && !es_stemmer::is_vowel($word[$i + 1])) {
             $r2 = $i + 2;
         }
     }
     if ($len > 3) {
         if (!es_stemmer::is_vowel($word[1])) {
             // If the second letter is a consonant, RV is the region after the next following vowel
             $rv = es_stemmer::getNextVowelPos($word, 2) + 1;
         } elseif (es_stemmer::is_vowel($word[0]) && es_stemmer::is_vowel($word[1])) {
             // or if the first two letters are vowels, RV is the region after the next consonant
             $rv = es_stemmer::getNextConsonantPos($word, 2) + 1;
         } else {
             //otherwise (consonant-vowel case) RV is the region after the third letter. But RV is the end of the word if these positions cannot be found.
             $rv = 3;
         }
     }
     $r1_txt = substr($word, $r1);
     $r2_txt = substr($word, $r2);
     $rv_txt = substr($word, $rv);
     $word_orig = $word;
     // Step 0: Attached pronoun
     $pronoun_suf = array('me', 'se', 'sela', 'selo', 'selas', 'selos', 'la', 'le', 'lo', 'las', 'les', 'los', 'nos');
     $pronoun_suf_pre1 = array('éndo', 'ándo', 'ár', 'ér', 'ír');
     $pronoun_suf_pre2 = array('ando', 'iendo', 'ar', 'er', 'ir');
     $suf = es_stemmer::endsinArr($word, $pronoun_suf);
     if ($suf != '') {
         $pre_suff = es_stemmer::endsinArr(substr($rv_txt, 0, -strlen($suf)), $pronoun_suf_pre1);
         if ($pre_suff != '') {
             $word = es_stemmer::removeAccent(substr($word, 0, -strlen($suf)));
         } else {
             $pre_suff = es_stemmer::endsinArr(substr($rv_txt, 0, -strlen($suf)), $pronoun_suf_pre2);
             if ($pre_suff != '' || es_stemmer::endsin($word, 'yendo') && substr($word, -strlen($suf) - 6, 1) == 'u') {
                 $word = substr($word, 0, -strlen($suf));
             }
         }
     }
     if ($word != $word_orig) {
         $r1_txt = substr($word, $r1);
         $r2_txt = substr($word, $r2);
         $rv_txt = substr($word, $rv);
     }
     $word_after0 = $word;
     if (($suf = es_stemmer::endsinArr($r2_txt, array('anza', 'anzas', 'ico', 'ica', 'icos', 'icas', 'ismo', 'ismos', 'able', 'ables', 'ible', 'ibles', 'ista', 'istas', 'oso', 'osa', 'osos', 'osas', 'amiento', 'amientos', 'imiento', 'imientos'))) != '') {
         $word = substr($word, 0, -strlen($suf));
     } elseif (($suf = es_stemmer::endsinArr($r2_txt, array('icadora', 'icador', 'icación', 'icadoras', 'icadores', 'icaciones', 'icante', 'icantes', 'icancia', 'icancias', 'adora', 'ador', 'ación', 'adoras', 'adores', 'aciones', 'ante', 'antes', 'ancia', 'ancias'))) != '') {
         $word = substr($word, 0, -strlen($suf));
     } elseif (($suf = es_stemmer::endsinArr($r2_txt, array('logía', 'logías'))) != '') {
         $word = substr($word, 0, -strlen($suf)) . 'log';
     } elseif (($suf = es_stemmer::endsinArr($r2_txt, array('ución', 'uciones'))) != '') {
         $word = substr($word, 0, -strlen($suf)) . 'u';
     } elseif (($suf = es_stemmer::endsinArr($r2_txt, array('encia', 'encias'))) != '') {
         $word = substr($word, 0, -strlen($suf)) . 'ente';
     } elseif (($suf = es_stemmer::endsinArr($r2_txt, array('ativamente', 'ivamente', 'osamente', 'icamente', 'adamente'))) != '') {
         $word = substr($word, 0, -strlen($suf));
     } elseif (($suf = es_stemmer::endsinArr($r1_txt, array('amente'))) != '') {
         $word = substr($word, 0, -strlen($suf));
     } elseif (($suf = es_stemmer::endsinArr($r2_txt, array('antemente', 'ablemente', 'iblemente', 'mente'))) != '') {
         $word = substr($word, 0, -strlen($suf));
     } elseif (($suf = es_stemmer::endsinArr($r2_txt, array('abilidad', 'abilidades', 'icidad', 'icidades', 'ividad', 'ividades', 'idad', 'idades'))) != '') {
         $word = substr($word, 0, -strlen($suf));
     } elseif (($suf = es_stemmer::endsinArr($r2_txt, array('ativa', 'ativo', 'ativas', 'ativos', 'iva', 'ivo', 'ivas', 'ivos'))) != '') {
         $word = substr($word, 0, -strlen($suf));
     }
     if ($word != $word_after0) {
         $r1_txt = substr($word, $r1);
         $r2_txt = substr($word, $r2);
         $rv_txt = substr($word, $rv);
     }
     $word_after1 = $word;
     if ($word_after0 == $word_after1) {
         // Do step 2a if no ending was removed by step 1.
         if (($suf = es_stemmer::endsinArr($rv_txt, array('ya', 'ye', 'yan', 'yen', 'yeron', 'yendo', 'yo', 'yó', 'yas', 'yes', 'yais', 'yamos'))) != '' && substr($word, -strlen($suf) - 1, 1) == 'u') {
             $word = substr($word, 0, -strlen($suf));
         }
         if ($word != $word_after1) {
             $r1_txt = substr($word, $r1);
             $r2_txt = substr($word, $r2);
             $rv_txt = substr($word, $rv);
         }
         $word_after2a = $word;
         // Do Step 2b if step 2a was done, but failed to remove a suffix.
         if ($word_after2a == $word_after1) {
             if (($suf = es_stemmer::endsinArr($rv_txt, array('en', 'es', 'éis', 'emos'))) != '') {
                 $word = substr($word, 0, -strlen($suf));
                 if (es_stemmer::endsin($word, 'gu')) {
                     $word = substr($word, 0, -1);
                 }
             } elseif (($suf = es_stemmer::endsinArr($rv_txt, array('arían', 'arías', 'arán', 'arás', 'aríais', 'aría', 'aréis', 'aríamos', 'aremos', 'ará', 'aré', 'erían', 'erías', 'erán', 'erás', 'eríais', 'ería', 'eréis', 'eríamos', 'eremos', 'erá', 'eré', 'irían', 'irías', 'irán', 'irás', 'iríais', 'iría', 'iréis', 'iríamos', 'iremos', 'irá', 'iré', 'aba', 'ada', 'ida', 'ía', 'ara', 'iera', 'ad', 'ed', 'id', 'ase', 'iese', 'aste', 'iste', 'an', 'aban', 'ían', 'aran', 'ieran', 'asen', 'iesen', 'aron', 'ieron', 'ado', 'ido', 'ando', 'iendo', 'ió', 'ar', 'er', 'ir', 'as', 'abas', 'adas', 'idas', 'ías', 'aras', 'ieras', 'ases', 'ieses', 'ís', 'áis', 'abais', 'íais', 'arais', 'ierais', '  aseis', 'ieseis', 'asteis', 'isteis', 'ados', 'idos', 'amos', 'ábamos', 'íamos', 'imos', 'áramos', 'iéramos', 'iésemos', 'ásemos'))) != '') {
                 $word = substr($word, 0, -strlen($suf));
             }
         }
     }
     // Always do step 3.
     $r1_txt = substr($word, $r1);
     $r2_txt = substr($word, $r2);
     $rv_txt = substr($word, $rv);
     if (($suf = es_stemmer::endsinArr($rv_txt, array('os', 'a', 'o', 'á', 'í', 'ó'))) != '') {
         $word = substr($word, 0, -strlen($suf));
     } elseif (($suf = es_stemmer::endsinArr($rv_txt, array('e', 'é'))) != '') {
         $word = substr($word, 0, -1);
         $rv_txt = substr($word, $rv);
         if (es_stemmer::endsin($rv_txt, 'u') && es_stemmer::endsin($word, 'gu')) {
             $word = substr($word, 0, -1);
         }
     }
     return es_stemmer::removeAccent($word);
 }