TranslationStats.php

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<?php
class TranslationStats {
    public static function getPercentageTranslated( $group, $languages, $threshold = false,
        $simple = false
    ) {
        $stats = array();

        $g = MessageGroups::singleton()->getGroup( $group );

        $collection = $g->initCollection( 'en' );
        foreach ( $languages as $code ) {
            $collection->resetForNewLanguage( $code );
            // Initialise messages
            $collection->filter( 'ignored' );
            $collection->filter( 'optional' );
            // Store the count of real messages for later calculation.
            $total = count( $collection );
            $collection->filter( 'translated', false );
            $translated = count( $collection );

            $translatedPercentage = ( $translated * 100 ) / $total;
            if ( $translatedPercentage >= $threshold ) {
                if ( $simple ) {
                    $stats[] = $code;
                } else {
                    $stats[$code] = $translatedPercentage;
                }
            }
        }

        return $stats;
    }
}