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<?php
/**
* TMarkdown class file
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package Prado\Web\UI\WebControls
*/
namespace Prado\Web\UI\WebControls;
use Parsedown;
/**
* TMarkdown class
*
* TMarkdown is a control that produces HTML from code with markdown syntax.
*
* Markdown is a text-to-HTML conversion tool for web writers. Markdown allows
* you to write using an easy-to-read, easy-to-write plain text format, then
* convert it to structurally valid XHTML (or HTML).
* Further documentation regarding Markdown can be found at
* http://daringfireball.net/projects/markdown/
*
* To use TMarkdown, simply enclose the content to be rendered within
* the body of TMarkdown in a template.
*
* See https://daringfireball.net/projects/markdown/basics for
* details on the Markdown syntax usage.
*
* TMarkdown also performs syntax highlighting for code blocks whose language
* is recognized by {@link TTextHighlighter}.
* The language of a code block must be specified in the first line of the block
* and enclosed within a pair of square brackets (e.g. [php]).
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @package Prado\Web\UI\WebControls
* @since 3.0.1
*/
class TMarkdown extends TTextHighlighter
{
/**
* Processes a text string.
* This method is required by the parent class.
* @param string text string to be processed
* @return string the processed text result
*/
public function processText($text)
{
$result = Parsedown::instance()->parse($text);
return preg_replace_callback(
'/<pre><code class="language-(\w+)">((.|\n)*?)<\\/code><\\/pre>/im',
array($this, 'highlightCode'), $result);
}
/**
* Highlights source code using TTextHighlighter
* @param array matches of code blocks
* @return string highlighted code.
*/
protected function highlightCode($matches)
{
$text = html_entity_decode($matches[2],ENT_QUOTES,'UTF-8');
$this->setLanguage($matches[1]);
return parent::processText($text);
}
}
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