LanguageOs.php

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<?php
class LanguageOs extends Language {

    function convertGrammar( $word, $case ) {
        global $wgGrammarForms;
        if ( isset( $wgGrammarForms['os'][$case][$word] ) ) {
            return $wgGrammarForms['os'][$case][$word];
        }
        # Ending for allative case
        $end_allative = 'мæ';
        # Variable for 'j' beetwen vowels
        $jot = '';
        # Variable for "-" for not Ossetic words
        $hyphen = '';
        # Variable for ending
        $ending = '';

        # CHecking if the $word is in plural form
        if ( preg_match( '/тæ$/u', $word ) ) {
            $word = mb_substr( $word, 0, -1 );
            $end_allative = 'æм';
        }
        # Works if $word is in singular form.
        # Checking if $word ends on one of the vowels: е, ё, и, о, ы, э, ю, я.
        elseif ( preg_match( "/[аæеёиоыэюя]$/u", $word ) ) {
            $jot = 'й';
        }
        # Checking if $word ends on 'у'. 'У' can be either consonant 'W' or vowel 'U' in cyrillic Ossetic.
        # Examples: {{grammar:genitive|аунеу}} = аунеуы, {{grammar:genitive|лæппу}} = лæппуйы.
        elseif ( preg_match( "/у$/u", $word ) ) {
            if ( !preg_match( "/[аæеёиоыэюя]$/u", mb_substr( $word, -2, 1 ) ) ) {
                $jot = 'й';
            }
        } elseif ( !preg_match( "/[бвгджзйклмнопрстфхцчшщьъ]$/u", $word ) ) {
            $hyphen = '-';
        }

        switch ( $case ) {
            case 'genitive':
                $ending = $hyphen . $jot . 'ы';
                break;
            case 'dative':
                $ending = $hyphen . $jot . 'æн';
                break;
            case 'allative':
                $ending = $hyphen . $end_allative;
                break;
            case 'ablative':
                if ( $jot == 'й' ) {
                    $ending = $hyphen . $jot . 'æ';
                } else {
                    $ending = $hyphen . $jot . 'æй';
                }
                break;
            case 'inessive':
                break;
            case 'superessive':
                $ending = $hyphen . $jot . 'ыл';
                break;
            case 'equative':
                $ending = $hyphen . $jot . 'ау';
                break;
            case 'comitative':
                $ending = $hyphen . 'имæ';
                break;
        }
        return $word . $ending;
    }
}