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<?php |
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namespace Jampire\Markdown\Toc; |
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use Michelf\MarkdownExtra as BaseMarkdownExtra; |
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/** |
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* Class MarkdownExtra |
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* |
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* TOC capability is ported from @link https://sculpin.io/ Sculpin project. |
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* @see generateHeaderId() |
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* |
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* @author Dzianis Kotau <[email protected]> |
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* @package Jampire\Markdown\Toc |
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*/ |
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class MarkdownExtra extends BaseMarkdownExtra |
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{ |
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public function __construct() |
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{ |
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parent::__construct(); |
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$this->header_id_func = array($this, 'generateHeaderId'); |
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} |
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/** |
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* This method is called to generate an id="" attribute for a header. |
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* |
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* TOC capability is ported from @link https://sculpin.io/ Sculpin project. |
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* |
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* @param string $headerText raw markdown input for the header name |
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* |
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* @return string |
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* @author Dragonfly Development Inc. <[email protected]> |
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* @author Beau Simensen <[email protected]> |
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*/ |
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public function generateHeaderId($headerText) |
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{ |
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// $headerText is completely raw markdown input. We need to strip it |
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// from all markup, because we are only interested in the actual 'text' |
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// part of it. |
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// Step 1: Remove html tags. |
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$result = strip_tags($headerText); |
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// Step 2: Remove all markdown links. To do this, we simply remove |
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// everything between ( and ) if the ( occurs right after a ]. |
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$result = preg_replace('% |
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(?<= \\]) # Look behind to find ] |
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( |
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\\( # match ( |
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[^\\)]* # match everything except ) |
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\\) # match ) |
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) |
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%x', '', $result); |
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// Step 3: Convert spaces to dashes, and remove unwanted special |
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// characters. |
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$map = array( |
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' ' => '-', |
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'(' => '', |
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')' => '', |
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'[' => '', |
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']' => '', |
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); |
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return rawurlencode(strtolower( |
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strtr($result, $map) |
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)); |
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} |
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} |
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Jampire /
toc-markdown-extra
