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<?php
/**
* This is a reimplementation of AR-PHP Arabic stemmer.
* The original author is Khaled Al-Sham'aa <khaled@ar-php.org>
*/
namespace TeamTNT\TNTSearch\Stemmer;
class ArabicStemmer implements Stemmer
{
private static $_verbPre = 'وأسفلي';
private static $_verbPost = 'ومكانيه';
private static $_verbMay;
private static $_verbMaxPre = 4;
private static $_verbMaxPost = 6;
private static $_verbMinStem = 2;
private static $_nounPre = 'ابفكلوأ';
private static $_nounPost = 'اتةكمنهوي';
private static $_nounMay;
private static $_nounMaxPre = 4;
private static $_nounMaxPost = 6;
private static $_nounMinStem = 2;
/**
* Loads initialize values
*
* @ignore
*/
public function __construct()
{
self::$_verbMay = self::$_verbPre . self::$_verbPost;
self::$_nounMay = self::$_nounPre . self::$_nounPost;
}
/**
* Get rough stem of the given Arabic word
*
* @param string $word Arabic word you would like to get its stem
*
* @return string Arabic stem of the word
* @author Khaled Al-Sham'aa <khaled@ar-php.org>
*/
public static function stem($word)
{
$nounStem = self::roughStem(
$word, self::$_nounMay, self::$_nounPre, self::$_nounPost,
self::$_nounMaxPre, self::$_nounMaxPost, self::$_nounMinStem
);
$verbStem = self::roughStem(
$word, self::$_verbMay, self::$_verbPre, self::$_verbPost,
self::$_verbMaxPre, self::$_verbMaxPost, self::$_verbMinStem
);
if (mb_strlen($nounStem, 'UTF-8') < mb_strlen($verbStem, 'UTF-8')) {
$stem = $nounStem;
} else {
$stem = $verbStem;
}
return $stem;
}
/**
* Get rough stem of the given Arabic word (under specific rules)
*
* @param string $word Arabic word you would like to get its stem
* @param string $notChars Arabic chars those can't be in postfix or prefix
* @param string $preChars Arabic chars those may exists in the prefix
* @param string $postChars Arabic chars those may exists in the postfix
* @param integer $maxPre Max prefix length
* @param integer $maxPost Max postfix length
* @param integer $minStem Min stem length
*
* @return string Arabic stem of the word under giving rules
* @author Khaled Al-Sham'aa <khaled@ar-php.org>
*/
protected static function roughStem (
$word, $notChars, $preChars, $postChars, $maxPre, $maxPost, $minStem
) {
$right = -1;
$left = -1;
$max = mb_strlen($word, 'UTF-8');
for ($i=0; $i < $max; $i++) {
$needle = mb_substr($word, $i, 1, 'UTF-8');
if (mb_strpos($notChars, $needle, 0, 'UTF-8') === false) {
if ($right == -1) {
$right = $i;
}
$left = $i;
}
}
if ($right > $maxPre) {
$right = $maxPre;
}
if ($max - $left - 1 > $maxPost) {
$left = $max - $maxPost -1;
}
for ($i=0; $i < $right; $i++) {
$needle = mb_substr($word, $i, 1, 'UTF-8');
if (mb_strpos($preChars, $needle, 0, 'UTF-8') === false) {
$right = $i;
break;
}
}
for ($i=$max-1; $i>$left; $i--) {
$needle = mb_substr($word, $i, 1, 'UTF-8');
if (mb_strpos($postChars, $needle, 0, 'UTF-8') === false) {
$left = $i;
break;
}
}
if ($left - $right >= $minStem) {
$stem = mb_substr($word, $right, $left-$right+1, 'UTF-8');
} else {
$stem = null;
}
return $stem;
}
}