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<?php |
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namespace sixlive; |
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use Parsedown; |
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use DomainException; |
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use Highlight\Highlighter; |
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use function HighlightUtilities\splitCodeIntoArray; |
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class ParsedownHighlight extends Parsedown |
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{ |
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protected $highlighter; |
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public function __construct() |
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{ |
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$this->highlighter = new Highlighter; |
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} |
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protected function blockFencedCodeComplete($block) |
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{ |
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if (! isset($block['element']['element']['attributes'])) { |
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return $block; |
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} |
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$code = $block['element']['element']['text']; |
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$blockClass = $block['element']['element']['attributes']['class']; // language-php{1,4-5} |
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$infoString = $this->parseInfoString($blockClass); |
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$language = $infoString['language']; |
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try { |
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$highlighted = $this->highlighter->highlight($language, $code); |
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$highlightedCode = $highlighted->value; |
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if (! empty($infoString['lines'])) { |
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$loc = splitCodeIntoArray($highlightedCode); |
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foreach ($loc as $i => &$line) { |
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$line = vsprintf('<span class="loc%s">%s</span>', [ |
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isset($infoString['lines'][$i + 1]) ? ' highlighted' : '', |
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$line, |
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]); |
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} |
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$highlightedCode = implode("\n", $loc); |
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} |
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$block['element']['element']['attributes']['class'] = vsprintf('language-%s hljs %s', [ |
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$highlighted->language, |
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$highlighted->language, |
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]); |
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$block['element']['element']['rawHtml'] = $highlightedCode; |
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unset($block['element']['element']['text']); |
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} catch (DomainException $e) { |
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// |
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} |
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return $block; |
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} |
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private function parseInfoString($languageClass) |
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{ |
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$infoString = [ |
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'language' => '', |
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'lines' => [], |
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]; |
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// The length of the following prefix attached by Parsedown: `language-` |
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$prefixLength = 9; |
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if (($bracePos = strpos($languageClass, '{'))) { |
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$infoString['language'] = substr($languageClass, $prefixLength, $bracePos - $prefixLength); |
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$rawLineDef = substr($languageClass, $bracePos + 1, -1); |
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$lineDefs = explode(',', $rawLineDef); |
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foreach ($lineDefs as $lineDef) { |
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if (($hyphenPos = strpos($lineDef, '-')) !== false) { |
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$start = intval(substr($lineDef, 0, $hyphenPos)); |
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$end = intval(substr($lineDef, $hyphenPos + 1)); |
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for ($i = $start; $i <= $end; $i++) { |
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$infoString['lines'][$i] = true; |
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} |
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} else { |
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$infoString['lines'][intval($lineDef)] = true; |
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} |
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} |
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} else { |
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$infoString['language'] = substr($languageClass, $prefixLength); |
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} |
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return $infoString; |
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} |
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} |
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sixlive /
parsedown-highlight
