Current File : //var/www/cwg/wp-content/plugins/searchwp/lib/vendor/wamania/php-stemmer/src/Russian.php
<?php
namespace SearchWP\Dependencies\Wamania\Snowball;
/**
*
* @link http://snowball.tartarus.org/algorithms/russian/stemmer.html
* @author wamania
*
*/
class Russian extends \SearchWP\Dependencies\Wamania\Snowball\Stem
{
/**
* All russian vowels
*/
protected static $vowels = array('а', 'е', 'и', 'о', 'у', 'ы', 'э', 'ю', 'я');
protected static $perfectiveGerund = array(array('вшись', 'вши', 'в'), array('ывшись', 'ившись', 'ывши', 'ивши', 'ив', 'ыв'));
protected static $adjective = array('ыми', 'ими', 'ему', 'ому', 'его', 'ого', 'ее', 'ие', 'ые', 'ое', 'ей', 'ий', 'ый', 'ой', 'ем', 'им', 'ым', 'ом', 'их', 'ых', 'ую', 'юю', 'ая', 'яя', 'ою', 'ею');
protected static $participle = array(array('ем', 'нн', 'вш', 'ющ', 'щ'), array('ивш', 'ывш', 'ующ'));
protected static $reflexive = array('ся', 'сь');
protected static $verb = array(array('ешь', 'нно', 'ете', 'йте', 'ла', 'на', 'ли', 'й', 'л', 'ем', 'н', 'ло', 'но', 'ет', 'ют', 'ны', 'ть'), array('уйте', 'ило', 'ыло', 'ено', 'ила', 'ыла', 'ена', 'ейте', 'ены', 'ить', 'ыть', 'ишь', 'ите', 'или', 'ыли', 'ует', 'уют', 'ей', 'уй', 'ил', 'ыл', 'им', 'ым', 'ен', 'ят', 'ит', 'ыт', 'ую', 'ю'));
protected static $noun = array('иями', 'ями', 'ами', 'ией', 'иям', 'ием', 'иях', 'ев', 'ов', 'ие', 'ье', 'еи', 'ии', 'ей', 'ой', 'ий', 'ям', 'ем', 'ам', 'ом', 'ах', 'ях', 'ию', 'ью', 'ия', 'ья', 'я', 'а', 'е', 'ы', 'ь', 'и', 'о', 'у', 'й', 'ю');
protected static $superlative = array('ейше', 'ейш');
protected static $derivational = array('ость', 'ост');
/**
* {@inheritdoc}
*/
public function stem($word)
{
// we do ALL in UTF-8
if (!\SearchWP\Dependencies\Wamania\Snowball\Utf8::check($word)) {
throw new \Exception('Word must be in UTF-8');
}
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::strtolower($word);
// R2 is not used: R1 is defined in the same way as in the German stemmer
$this->r1();
$this->r2();
$this->rv();
// Do each of steps 1, 2 3 and 4.
$this->step1();
$this->step2();
$this->step3();
$this->step4();
return $this->word;
}
/**
* Step 1: Search for a PERFECTIVE GERUND ending. If one is found remove it, and that is then the end of step 1.
* Otherwise try and remove a REFLEXIVE ending, and then search in turn for (1) an ADJECTIVAL, (2) a VERB or (3) a NOUN ending.
* As soon as one of the endings (1) to (3) is found remove it, and terminate step 1.
*/
public function step1()
{
// Search for a PERFECTIVE GERUND ending.
// group 1
if (($position = $this->searchIfInRv(self::$perfectiveGerund[0])) !== \false) {
if ($this->inRv($position) && $this->checkGroup1($position)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
return \true;
}
}
// group 2
if (($position = $this->searchIfInRv(self::$perfectiveGerund[1])) !== \false) {
if ($this->inRv($position)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
return \true;
}
}
// Otherwise try and remove a REFLEXIVE ending
if (($position = $this->searchIfInRv(self::$reflexive)) !== \false) {
if ($this->inRv($position)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
}
}
// then search in turn for (1) an ADJECTIVAL, (2) a VERB or (3) a NOUN ending.
// As soon as one of the endings (1) to (3) is found remove it, and terminate step 1.
if (($position = $this->searchIfInRv(self::$adjective)) !== \false) {
if ($this->inRv($position)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
if (($position2 = $this->search(self::$participle[0])) !== \false) {
if ($this->inRv($position2) && $this->checkGroup1($position2)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position2);
return \true;
}
}
if (($position2 = $this->search(self::$participle[1])) !== \false) {
if ($this->inRv($position2)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position2);
return \true;
}
}
return \true;
}
}
if (($position = $this->searchIfInRv(self::$verb[0])) !== \false) {
if ($this->inRv($position) && $this->checkGroup1($position)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
return \true;
}
}
if (($position = $this->searchIfInRv(self::$verb[1])) !== \false) {
if ($this->inRv($position)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
return \true;
}
}
if (($position = $this->searchIfInRv(self::$noun)) !== \false) {
if ($this->inRv($position)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
return \true;
}
}
return \false;
}
/**
* Step 2: If the word ends with и (i), remove it.
*/
public function step2()
{
if (($position = $this->searchIfInRv(array('и'))) !== \false) {
if ($this->inRv($position)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
return \true;
}
}
return \false;
}
/**
* Step 3: Search for a DERIVATIONAL ending in R2 (i.e. the entire ending must lie in R2),
* and if one is found, remove it.
*/
public function step3()
{
if (($position = $this->searchIfInRv(self::$derivational)) !== \false) {
if ($this->inR2($position)) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
return \true;
}
}
}
/**
* Step 4: (1) Undouble н (n), or, (2) if the word ends with a SUPERLATIVE ending, remove it
* and undouble н (n), or (3) if the word ends ь (') (soft sign) remove it.
*/
public function step4()
{
// (2) if the word ends with a SUPERLATIVE ending, remove it
if (($position = $this->searchIfInRv(self::$superlative)) !== \false) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
}
// (1) Undouble н (n)
if (($position = $this->searchIfInRv(array('нн'))) !== \false) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position + 1);
return \true;
}
// (3) if the word ends ь (') (soft sign) remove it
if (($position = $this->searchIfInRv(array('ь'))) !== \false) {
$this->word = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, 0, $position);
return \true;
}
}
/**
* In any word, RV is the region after the first vowel, or the end of the word if it contains no vowel.
*/
protected function rv()
{
$length = \SearchWP\Dependencies\Wamania\Snowball\Utf8::strlen($this->word);
$this->rv = '';
$this->rvIndex = $length;
for ($i = 0; $i < $length; $i++) {
$letter = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, $i, 1);
if (\in_array($letter, self::$vowels)) {
$this->rv = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, $i + 1);
$this->rvIndex = $i + 1;
return \true;
}
}
return \false;
}
/**
* group 1 endings must follow а (a) or я (ia)
*
* @param integer $position
* @return boolean
*/
private function checkGroup1($position)
{
if (!$this->inRv($position - 1)) {
return \false;
}
$letter = \SearchWP\Dependencies\Wamania\Snowball\Utf8::substr($this->word, $position - 1, 1);
if ($letter == 'а' || $letter == 'я') {
return \true;
}
return \false;
}
}
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