<?php/* @description     Transformation Style Sheets - Revolutionising PHP templating    * * @author          Tom Butler tom@r.je                                             * * @copyright       2017 Tom Butler <tom@r.je> | https://r.je/                      * * @license         http://www.opensource.org/licenses/bsd-license.php  BSD License * * @version         1.2                                                             */namespace Transphporm\Hook;/** Handles format: foo bar properties in the stylesheet */class Formatter {	private $formatters = [];	public function register($formatter) {		$this->formatters[] = $formatter;	}	public function format($value, $rules) {		if (!isset($rules['format'])) return $value;		$tokens = $rules['format'];		$functionName = $tokens->from(\Transphporm\Parser\Tokenizer::NAME, true)->read();		$options = [];		foreach (new \Transphporm\Parser\TokenFilterIterator($tokens->from(\Transphporm\Parser\Tokenizer::NAME),					[\Transphporm\Parser\Tokenizer::WHITESPACE]) as $token) {			$options[] = $token['value'];		}		try {			return $this->processFormat($options, $functionName, $value);		}		catch (\Exception $e) {			throw new \Transphporm\RunException(\Transphporm\Exception::FORMATTER, $functionName, $e);		}	}	public function runOnImmutableElements(): bool {		return false;	}	//TODO: Abstract all error reporting externally with a method for turning it on/off	private function assert($condition, $error) {		if (!$condition) throw new \Exception($error);	}	private function processFormat($format, $functionName, $value) {		$functionExists = false;		foreach ($value as &$val) {			foreach ($this->formatters as $formatter) {				if (is_callable([$formatter, $functionName])) {					$val = call_user_func_array([$formatter, $functionName], array_merge([$val], $format));					$functionExists = true;				}			}		}		$this->assert($functionExists, "Formatter '$functionName' does not exist");		return $value;	}}