EnConverter.php

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<?php
class EnConverter extends LanguageConverter {
 
    public function __construct( $langobj ) {
        parent::__construct( $langobj, 'en', [ 'en', 'en-x-piglatin' ] );
    }
 
    protected function loadDefaultTables() {
        $this->mTables = [
            'en' => new ReplacementArray(),
            'en-x-piglatin' => new ReplacementArray(),
        ];
    }
 
    public function translate( $text, $toVariant ) {
        if ( $toVariant !== 'en-x-piglatin' ) {
            return $text;
        }
 
        // Only process words composed of standard English alphabet, leave the rest unchanged.
        // This skips some English words like 'naïve' or 'résumé', but we can live with that.
        // Ignore single letters and words which aren't lowercase or uppercase-first.
        return preg_replace_callback( '/[A-Za-z][a-z\']+/', function ( $matches ) {
            $word = $matches[0];
            if ( preg_match( '/^[aeiou]/i', $word ) ) {
                return $word . 'way';
            }
 
            return preg_replace_callback( '/^(s?qu|[^aeiou][^aeiouy]*)(.*)$/i', function ( $m ) {
                $ucfirst = strtoupper( $m[1][0] ) === $m[1][0];
                if ( $ucfirst ) {
                    return ucfirst( $m[2] ) . lcfirst( $m[1] ) . 'ay';
                }
 
                return $m[2] . $m[1] . 'ay';
            }, $word );
        }, $text );
    }
}