Flow\Loader::load PHP Method

    public function load($template, $from = '')
    {
        if ($template instanceof Template) {
            return $template;
        }
        if (!is_string($template)) {
            throw new \InvalidArgumentException('string expected');
        }
        $source = $this->options['source'];
        $adapter = $this->options['adapter'];
        if (isset($this->paths[$template . $from])) {
            $path = $this->paths[$template . $from];
        } else {
            $path = $this->resolvePath($template, $from);
            $this->paths[$template . $from] = $path;
        }
        $class = self::CLASS_PREFIX . md5($path);
        if (isset($this->cache[$class])) {
            return $this->cache[$class];
        }
        if (!class_exists($class, false)) {
            if (!$adapter->isReadable($path)) {
                throw new \RuntimeException(sprintf('%s is not a valid readable template', $template));
            }
            $target = $this->options['target'] . '/' . $class . '.php';
            switch ($this->options['mode']) {
                case self::RECOMPILE_ALWAYS:
                    $compile = true;
                    break;
                case self::RECOMPILE_NEVER:
                    $compile = !file_exists($target);
                    break;
                case self::RECOMPILE_NORMAL:
                default:
                    $compile = !file_exists($target) || filemtime($target) < $adapter->lastModified($path);
                    break;
            }
            if ($compile) {
                try {
                    $lexer = new Lexer($adapter->getContents($path));
                    $parser = new Parser($lexer->tokenize());
                    $compiler = new Compiler($parser->parse());
                    $compiler->compile($path, $target);
                } catch (SyntaxError $e) {
                    throw $e->setMessage($path . ': ' . $e->getMessage());
                }
            }
            require_once $target;
        }
        $this->cache[$class] = new $class($this, $this->options['helpers']);
        return $this->cache[$class];
    }