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<?php |
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namespace Spatie\CommonMarkHighlighter; |
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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 CodeBlockHighlighter |
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{ |
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/** @var \Highlight\Highlighter */ |
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protected $highlighter; |
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public function __construct(array $autodetectLanguages = []) |
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{ |
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$this->highlighter = new Highlighter(); |
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$this->highlighter->setAutodetectLanguages($autodetectLanguages); |
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} |
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public function highlight(string $codeBlock, ?string $infoLine = null) |
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{ |
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$codeBlockWithoutTags = strip_tags($codeBlock); |
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$contents = htmlspecialchars_decode($codeBlockWithoutTags); |
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$definition = $this->parseLangAndLines($infoLine); |
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$language = $definition['lang']; |
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try { |
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$result = $language |
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? $this->highlighter->highlight($language, $contents) |
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: $this->highlighter->highlightAuto($contents); |
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$code = $result->value; |
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if (count($definition['lines']) > 0) { |
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$loc = splitCodeIntoArray($code); |
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foreach ($loc as $i => $line) { |
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$loc[$i] = vsprintf('<span class="loc%s">%s</span>', [ |
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isset($definition['lines'][$i + 1]) ? ' highlighted' : '', |
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$line, |
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]); |
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} |
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$code = implode("\n", $loc); |
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} |
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return vsprintf('<code class="%s hljs %s" data-lang="%s">%s</code>', [ |
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'language-'.($language ? $language : $result->language), |
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$result->language, |
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$language ? $language : $result->language, |
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$code, |
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]); |
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} catch (DomainException $e) { |
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return $codeBlock; |
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} |
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} |
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private function parseLangAndLines(?string $language) |
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{ |
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$parsed = [ |
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'lang' => $language, |
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'lines' => [], |
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]; |
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if ($language === null) { |
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return $parsed; |
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} |
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$bracePos = strpos($language, '{'); |
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if ($bracePos === false) { |
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return $parsed; |
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} |
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$parsed['lang'] = substr($language, 0, $bracePos); |
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$lineDef = substr($language, $bracePos + 1, -1); |
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$lineNums = explode(',', $lineDef); |
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foreach ($lineNums as $lineNum) { |
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if (strpos($lineNum, '-') === false) { |
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$parsed['lines'][intval($lineNum)] = true; |
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continue; |
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} |
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$extremes = explode('-', $lineNum); |
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if (count($extremes) !== 2) { |
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continue; |
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} |
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$start = intval($extremes[0]); |
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$end = intval($extremes[1]); |
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for ($i = $start; $i <= $end; $i++) { |
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$parsed['lines'][$i] = true; |
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} |
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} |
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return $parsed; |
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} |
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} |
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spatie /
commonmark-highlighter
