LanguageRu.php

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<?php
class LanguageRu extends Language {

        function convertGrammar( $word, $case ) {
                global $wgGrammarForms;
                if ( isset( $wgGrammarForms['ru'][$case][$word] ) ) {
                        return $wgGrammarForms['ru'][$case][$word];
                }

                # These rules are not perfect, but they are currently only used for Wikimedia site names so it doesn't
                # matter if they are wrong sometimes. Just add a special case for your site name if necessary.

                # substr doesn't support Unicode and mb_substr has issues,
                # so break it to characters using preg_match_all and then use array_slice and join
                $chars = array();
                preg_match_all( '/./us', $word, $chars );
                if ( !preg_match( "/[a-zA-Z_]/us", $word ) ) {
                        switch ( $case ) {
                                case 'genitive': # родительный падеж
                                        if ( join( '', array_slice( $chars[0], -1 ) ) === 'ь' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -1 ) ) . 'я';
                                        } elseif ( join( '', array_slice( $chars[0], -2 ) ) === 'ия' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -2 ) ) . 'ии';
                                        } elseif ( join( '', array_slice( $chars[0], -2 ) ) === 'ка' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -2 ) ) . 'ки';
                                        } elseif ( join( '', array_slice( $chars[0], -2 ) ) === 'ти' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -2 ) ) . 'тей';
                                        } elseif ( join( '', array_slice( $chars[0], -2 ) ) === 'ды' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -2 ) ) . 'дов';
                                        } elseif ( join( '', array_slice( $chars[0], -3 ) ) === 'ник' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -3 ) ) . 'ника';
                                        } elseif ( join( '', array_slice( $chars[0], -3 ) ) === 'ные' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -3 ) ) . 'ных';
                                        }
                                        break;
                                case 'dative': # дательный падеж
                                        # stub
                                        break;
                                case 'accusative': # винительный падеж
                                        # stub
                                        break;
                                case 'instrumental': # творительный падеж
                                        # stub
                                        break;
                                case 'prepositional': # предложный падеж
                                        if ( join( '', array_slice( $chars[0], -1 ) ) === 'ь' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -1 ) ) . 'е';
                                        } elseif ( join( '', array_slice( $chars[0], -2 ) ) === 'ия' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -2 ) ) . 'ии';
                                        } elseif ( join( '', array_slice( $chars[0], -2 ) ) === 'ка' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -2 ) ) . 'ке';
                                        } elseif ( join( '', array_slice( $chars[0], -2 ) ) === 'ти' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -2 ) ) . 'тях';
                                        } elseif ( join( '', array_slice( $chars[0], -2 ) ) === 'ды' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -2 ) ) . 'дах';
                                        } elseif ( join( '', array_slice( $chars[0], -3 ) ) === 'ник' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -3 ) ) . 'нике';
                                        } elseif ( join( '', array_slice( $chars[0], -3 ) ) === 'ные' ) {
                                                $word = join( '', array_slice( $chars[0], 0, -3 ) ) . 'ных';
                                        }
                                        break;
                        }
                }

                return $word;
        }

        function convertPlural( $count, $forms ) {
                if ( !count( $forms ) ) {
                        return '';
                }

                // If the actual number is not mentioned in the expression, then just two forms are enough:
                // singular for $count === 1
                // plural   for $count !== 1
                // For example, "This user belongs to {{PLURAL:$1|one group|several groups}}."
                if ( count( $forms ) === 2 ) {
                        return $count === 1 ? $forms[0] : $forms[1];
                }

                // @todo FIXME: CLDR defines 4 plural forms. Form with decimals missing.
                // See http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html#ru
                $forms = $this->preConvertPlural( $forms, 3 );

                if ( $count > 10 && (int)floor( ( $count % 100 ) / 10 ) === 1 ) {
                        return $forms[2];
                }

                switch ( $count % 10 ) {
                        case 1:
                                return $forms[0];
                        case 2:
                        case 3:
                        case 4:
                                return $forms[1];
                        default:
                                return $forms[2];
                }
        }

        function commafy( $_ ) {
                if ( preg_match( '/^-?\d{1,4}(\.\d*)?$/', $_ ) ) {
                        return $_;
                } else {
                        return strrev( (string)preg_replace( '/(\d{3})(?=\d)(?!\d*\.)/', '$1,', strrev( $_ ) ) );
                }
        }
}