EnConverter.php

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<?php
class EnConverter extends LanguageConverter {
 
    public function getMainCode(): string {
        return 'en';
    }
 
    public function getLanguageVariants(): array {
        return [ 'en', 'en-x-piglatin' ];
    }
 
    public function getVariantsFallbacks(): array {
        return [];
    }
 
    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;
        }
        // Apply any custom rules.  (Primarily for testing.)
        $this->loadTables();
        $customRules = $this->mTables[$toVariant];
 
        if ( !$customRules->getArray() ) {
            return self::pigLatin( $text );
        }
 
        // Split on the matches from custom rules, so that we only apply
        // the Pig Latin transformation on output which is not from a
        // custom rule; this avoids double-conversion.
        // (See SrConverter for similar split-and-process code.)
        $re = '(' .
            implode(
                '|',
                array_map(
                    'preg_quote',
                    // "Original" texts from the ReplacementArray rules
                    array_keys( $customRules->getArray() )
                )
             ) . ')';
 
        $matches = preg_split( $re, $text, -1, PREG_SPLIT_OFFSET_CAPTURE );
        $m = array_shift( $matches );
 
        // Apply Pig Latin transformation to initial "non-matching" section.
        $ret = self::pigLatin( $m[0] );
        $mstart = (int)$m[1] + strlen( $m[0] );
        foreach ( $matches as $m ) {
            // Use the ReplacementArray rules to transform any matching sections
            $ret .= $customRules->replace(
                substr( $text, $mstart, (int)$m[1] - $mstart )
            );
            // And Pig Latin transformation on the non-matching sections.
            $ret .= self::pigLatin( $m[0] );
            $mstart = (int)$m[1] + strlen( $m[0] );
        }
        // $mstart will always equal strlen($text) here.
 
        return $ret;
    }
 
    private static function pigLatin( string $text ): string {
        // 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\']+/', static function ( $matches ) {
            $word = $matches[0];
            if ( preg_match( '/^[aeiou]/i', $word ) ) {
                return $word . 'way';
            }
 
            return preg_replace_callback( '/^(s?qu|[^aeiou][^aeiouy]*)(.*)$/i', static 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 );
    }
}