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Editing: Dutch.php

<?php

namespace Wamania\Snowball\Stemmer;

use Joomla\String\StringHelper;

/**
 *
 * @link http://snowball.tartarus.org/algorithms/dutch/stemmer.html
 * @author wamania
 *
 */
class Dutch extends Stem
{
    /**
     * All dutch vowels
     */
    protected static $vowels = array('a', 'e', 'i', 'o', 'u', 'y', 'è');

/**
     * {@inheritdoc}
     */
    public function stem($word)
    {
        $this->word = StringHelper::strtolower($word);

// First, remove all umlaut and acute accents.
        $this->word = str_replace(
            array('ä', 'ë', 'ï', 'ö', 'ü', 'á', 'é', 'í', 'ó', 'ú'),
            array('a', 'e', 'i', 'o', 'u', 'a', 'e', 'i', 'o', 'u'),
            $this->word);

$this->plainVowels = implode('', self::$vowels);

// Put initial y, y after a vowel, and i between vowels into upper case.
        $this->word = preg_replace('#^y#u', 'Y', $this->word);
        $this->word = preg_replace('#(['.$this->plainVowels.'])y#u', '$1Y', $this->word);
        $this->word = preg_replace('#(['.$this->plainVowels.'])i(['.$this->plainVowels.'])#u', '$1I$2', $this->word);

// R1 and R2 (see the note on R1 and R2) are then defined as in German.
        // R1 and R2 are first set up in the standard way
        $this->r1();
        $this->r2();

// but then R1 is adjusted so that the region before it contains at least 3 letters.
        if ($this->r1Index < 3) {
            $this->r1Index = 3;
            $this->r1 = StringHelper::substr($this->word, 3);
        }

// Do each of steps 1, 2 3 and 4.
        $this->step1();
        $removedE = $this->step2();
        $this->step3a();
        $this->step3b($removedE);
        $this->step4();
        $this->finish();

return $this->word;
    }

/**
     * Define a valid s-ending as a non-vowel other than j.
     * @param string $ending
     * @return boolean
     */
    private function hasValidSEnding($word)
    {
        $lastLetter = StringHelper::substr($word, -1, 1);
        return !in_array($lastLetter, array_merge(self::$vowels, array('j')));
    }

/**
     * Define a valid en-ending as a non-vowel, and not gem.
     * @param string $ending
     * @return boolean
     */
    private function hasValidEnEnding($word)
    {
        $lastLetter = StringHelper::substr($word, -1, 1);
        if (in_array($lastLetter, self::$vowels)) {
            return false;
        }

$threeLastLetters = StringHelper::substr($word, -3, 3);
        if ($threeLastLetters == 'gem') {
            return false;
        }
        return true;
    }

/**
     *  Define undoubling the ending as removing the last letter if the word ends kk, dd or tt.
     */
    private function unDoubling()
    {
        if ($this->search(array('kk', 'dd', 'tt')) !== false) {
            $this->word = StringHelper::substr($this->word, 0, -1);
        }
    }

/**
     * Step 1
     * Search for the longest among the following suffixes, and perform the action indicated
     */
    private function step1()
    {
        // heden
        //      replace with heid if in R1
        if ( ($position = $this->search(array('heden'))) !== false) {
            if ($this->inR1($position)) {
                $this->word = preg_replace('#(heden)$#u', 'heid', $this->word);
            }
            return true;
        }

// en   ene
        //      delete if in R1 and preceded by a valid en-ending, and then undouble the ending
        if ( ($position = $this->search(array('ene', 'en'))) !== false) {
            if ($this->inR1($position)) {
                $word = StringHelper::substr($this->word, 0, $position);
                if ($this->hasValidEnEnding($word)) {
                    $this->word = $word;
                    $this->unDoubling();
                }
            }
            return true;
        }

// s   se
        //      delete if in R1 and preceded by a valid s-ending
        if ( ($position = $this->search(array('se', 's'))) !== false) {
            if ($this->inR1($position)) {
                $word = StringHelper::substr($this->word, 0, $position);
                if ($this->hasValidSEnding($word)) {
                    $this->word = $word;
                }
            }
            return true;
        }

return false;
    }

/**
     * Step 2
     * Delete suffix e if in R1 and preceded by a non-vowel, and then undouble the ending
     */
    private function step2()
    {
        if ( ($position = $this->search(array('e'))) !== false) {
            if ($this->inR1($position)) {
                $letter = StringHelper::substr($this->word, -2, 1);
                if (!in_array($letter, self::$vowels)) {
                    $this->word = StringHelper::substr($this->word, 0, $position);
                    $this->unDoubling();

return true;
                }
            }
        }

return false;
    }

/**
     * Step 3a: heid
     * delete heid if in R2 and not preceded by c, and treat a preceding en as in step 1(b)
     */
    private function step3a()
    {
        if ( ($position = $this->search(array('heid'))) !== false) {
            if ($this->inR2($position)) {
                $letter = StringHelper::substr($this->word, -5, 1);
                if ($letter !== 'c') {
                    $this->word = StringHelper::substr($this->word, 0, $position);

if ( ($position = $this->search(array('en'))) !== false) {
                        if ($this->inR1($position)) {
                            $word = StringHelper::substr($this->word, 0, $position);
                            if ($this->hasValidEnEnding($word)) {
                                $this->word = $word;
                                $this->unDoubling();
                            }
                        }
                    }
                }
            }
        }

}

/**
     * Step 3b: d-suffixe
     * Search for the longest among the following suffixes, and perform the action indicated.
     */
    private function step3b($removedE)
    {
        // end   ing
        //      delete if in R2
        //      if preceded by ig, delete if in R2 and not preceded by e, otherwise undouble the ending
        if ( ($position = $this->search(array('end', 'ing'))) !== false) {
            if ($this->inR2($position)) {
                $this->word = StringHelper::substr($this->word, 0, $position);

if ( ($position2 = $this->searchIfInR2(array('ig'))) !== false) {
                    $letter = StringHelper::substr($this->word, -3, 1);
                    if ($letter !== 'e') {
                        $this->word = StringHelper::substr($this->word, 0, $position2);
                    }
                } else {
                    $this->unDoubling();
                }
            }

return true;
        }

// ig
        //      delete if in R2 and not preceded by e
        if ( ($position = $this->search(array('ig'))) !== false) {
            if ($this->inR2($position)) {
                $letter = StringHelper::substr($this->word, -3, 1);
                if ($letter !== 'e') {
                    $this->word = StringHelper::substr($this->word, 0, $position);
                }
            }
            return true;
        }

// lijk
        //      delete if in R2, and then repeat step 2
        if ( ($position = $this->search(array('lijk'))) !== false) {
            if ($this->inR2($position)) {
                $this->word = StringHelper::substr($this->word, 0, $position);
                $this->step2();
            }
            return true;
        }

// baar
        //      delete if in R2
        if ( ($position = $this->search(array('baar'))) !== false) {
            if ($this->inR2($position)) {
                $this->word = StringHelper::substr($this->word, 0, $position);
            }
            return true;
        }

// bar
        //      delete if in R2 and if step 2 actually removed an e
        if ( ($position = $this->search(array('bar'))) !== false) {
            if ($this->inR2($position) && $removedE) {
                $this->word = StringHelper::substr($this->word, 0, $position);
            }
            return true;
        }

return false;
    }

/**
     * Step 4: undouble vowel
     * If the words ends CVD, where C is a non-vowel, D is a non-vowel other than I, and V is double a, e, o or u,
     * remove one of the vowels from V (for example, maan -> man, brood -> brod).
     */
    private function step4()
    {
        // D is a non-vowel other than I
        $d = StringHelper::substr($this->word, -1, 1);
        if (in_array($d, array_merge(self::$vowels, array('I')))) {
            return false;
        }

// V is double a, e, o or u
        $v = StringHelper::substr($this->word, -3, 2);
        if (!in_array($v, array('aa', 'ee', 'oo', 'uu'))) {
            return false;
        }
        $singleV = StringHelper::substr($v, 0, 1);

// C is a non-vowel
        $c = StringHelper::substr($this->word, -4, 1);
        if (in_array($c, self::$vowels)) {
            return false;
        }

$this->word = StringHelper::substr($this->word, 0, -4);
        $this->word .= $c . $singleV  .$d;
    }

/**
     * Finally
     * Turn I and Y back into lower case.
     */
    private function finish()
    {
        $this->word = str_replace(array('I', 'Y'), array('i', 'y'), $this->word);
    }
}

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