Plural_Forms::execute( int $n ): int

261		public function execute( $n ) {262			$stack = array();263			$i     = 0;264			$total = count( $this->tokens );265			while ( $i < $total ) {266				$next = $this->tokens[ $i ];267				++$i;268				if ( 'var' === $next[0] ) {269					$stack[] = $n;270					continue;271				} elseif ( 'value' === $next[0] ) {272					$stack[] = $next[1];273					continue;274				}275 276				// Only operators left.277				switch ( $next[1] ) {278					case '%':279						$v2      = array_pop( $stack );280						$v1      = array_pop( $stack );281						$stack[] = $v1 % $v2;282						break;283 284					case '||':285						$v2      = array_pop( $stack );286						$v1      = array_pop( $stack );287						$stack[] = $v1 || $v2;288						break;289 290					case '&&':291						$v2      = array_pop( $stack );292						$v1      = array_pop( $stack );293						$stack[] = $v1 && $v2;294						break;295 296					case '<':297						$v2      = array_pop( $stack );298						$v1      = array_pop( $stack );299						$stack[] = $v1 < $v2;300						break;301 302					case '<=':303						$v2      = array_pop( $stack );304						$v1      = array_pop( $stack );305						$stack[] = $v1 <= $v2;306						break;307 308					case '>':309						$v2      = array_pop( $stack );310						$v1      = array_pop( $stack );311						$stack[] = $v1 > $v2;312						break;313 314					case '>=':315						$v2      = array_pop( $stack );316						$v1      = array_pop( $stack );317						$stack[] = $v1 >= $v2;318						break;319 320					case '!=':321						$v2      = array_pop( $stack );322						$v1      = array_pop( $stack );323						$stack[] = $v1 !== $v2;324						break;325 326					case '==':327						$v2      = array_pop( $stack );328						$v1      = array_pop( $stack );329						$stack[] = $v1 === $v2;330						break;331 332					case '?:':333						$v3      = array_pop( $stack );334						$v2      = array_pop( $stack );335						$v1      = array_pop( $stack );336						$stack[] = $v1 ? $v2 : $v3;337						break;338 339					default:340						throw new Exception( sprintf( 'Unknown operator "%s"', $next[1] ) );