ResourceLoaderLanguageDataModule.php

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<?php
class ResourceLoaderLanguageDataModule extends ResourceLoaderModule {

    protected $targets = array( 'desktop', 'mobile' );

    protected function getData( ResourceLoaderContext $context ) {
        $language = Language::factory( $context->getLanguage() );
        return array(
            'digitTransformTable' => $language->digitTransformTable(),
            'separatorTransformTable' => $language->separatorTransformTable(),
            'grammarForms' => $language->getGrammarForms(),
            'pluralRules' => $language->getPluralRules(),
            'digitGroupingPattern' => $language->digitGroupingPattern(),
            'fallbackLanguages' => $language->getFallbackLanguages(),
        );
    }

    public function getScript( ResourceLoaderContext $context ) {
        return Xml::encodeJsCall( 'mw.language.setData', array(
            $context->getLanguage(),
            $this->getData( $context )
        ) );
    }

    public function getModifiedTime( ResourceLoaderContext $context ) {
        return max( 1, $this->getHashMtime( $context ) );
    }

    public function getModifiedHash( ResourceLoaderContext $context ) {
        return md5( serialize( $this->getData( $context ) ) );
    }

    public function getDependencies() {
        return array( 'mediawiki.language.init' );
    }
}