WikiMessageGroup.php

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<?php
class WikiMessageGroup extends MessageGroupOld {
    protected $source = null;

    public function __construct( $id, $source ) {
        parent::__construct();
        $this->id = $id;
        $this->source = $source;
    }

    public function getSourceLanguage() {
        global $wgLanguageCode;

        return $wgLanguageCode;
    }

    public function getDefinitions() {
        $definitions = array();

        // In theory the page could have templates that are substitued
        $source = wfMessage( $this->source );
        if ( $source->isDisabled() ) {
            return array();
        }

        $contents = $source->text();
        $contents = preg_replace( '~^\s*#.*$~m', '', $contents );
        $messages = preg_split( '/\s+/', $contents );

        foreach ( $messages as $message ) {
            if ( !$message ) {
                continue;
            }

            $definitions[$message] = wfMessage( $message )->inContentLanguage()->plain();
        }

        return $definitions;
    }

    public function getMessage( $key, $code ) {
        if ( $code && $this->getSourceLanguage() !== $code ) {
            return TranslateUtils::getMessageContent( $key, $code );
        } else {
            return TranslateUtils::getMessageContent( $key, false );
        }
    }
}