87 lines
3.3 KiB
PHP
87 lines
3.3 KiB
PHP
<?php
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use Highlight\Highlighter;
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use JohannSchopplich\HTML5DOMDocument;
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use Kirby\Cms\App;
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return [
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'kirbytext:after' => function (string|null $text) {
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$kirby = App::instance();
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// Parse KirbyText input as HTML document
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$dom = new HTML5DOMDocument();
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$dom->loadHTML($text);
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// Retrieve all `pre` elements inside newly created HTML document
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$preNodes = $dom->getElementsByTagName('pre');
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// Bail if no `pre` elements have been found
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if ($preNodes->length === 0) {
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return $text;
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}
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// Loop through all `pre` elements
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foreach ($preNodes as $preNode) {
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// Ensure nothing but the `code` element exists
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if ($preNode->childNodes->length !== 1) {
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continue;
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}
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// Select direct `code` child element of `pre` block
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$codeNode = $preNode->firstChild;
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// Get language code if present
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$language = $codeNode->getAttribute('class');
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if (str_starts_with($language, 'language-')) {
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$language = preg_replace('/^language-/', '', $language);
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}
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// Bail highlighting if language isn't set and auto detection is disabled
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if (empty($language) && !$kirby->option('johannschopplich.highlighter.autodetect', false)) {
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continue;
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}
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// Add `hljs` class to `pre` block
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$preNode->setAttribute('class', $kirby->option('johannschopplich.highlighter.class', 'hljs'));
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// Get raw code data to highlight
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$code = $codeNode->nodeValue;
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// Remove code element afterwards
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$preNode->removeChild($codeNode);
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// Initiate `Highlighter` and use pre-defined language code, fall
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// back to language auto detection if enabled
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$highlighter = new Highlighter();
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// Highlight code
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if (!empty($language)) {
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$highlightedCode = $highlighter->highlight($language, $code);
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} elseif ($kirby->option('johannschopplich.highlighter.autodetect', false)) {
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$languageSubset = $kirby->option('johannschopplich.highlighter.languages', []);
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if (!empty($languageSubset)) {
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$highlighter->setAutodetectLanguages($languageSubset);
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}
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$highlightedCode = $highlighter->highlightAuto($code);
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}
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// Line numbering
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if ($kirby->option('johannschopplich.highlighter.line-numbering', false)) {
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$lines = preg_split('/\R/', $highlightedCode->value);
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$lineClass = $kirby->option('johannschopplich.highlighter.line-numbering-class', 'hljs-code-line');
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$highlightedCode->value = '<span class="' . $lineClass . '">' . implode("</span>\n<span class=\"$lineClass\">", $lines) . '</span>';
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}
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// Append highlighted wrapped in `code` block to parent `pre`
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$codeNode = $dom->createDocumentFragment();
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$codeNode->appendXML('<code data-language="' . $language . '">' . $highlightedCode->value . '</code>');
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$preNode->appendChild($codeNode);
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}
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// Save all changes
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$text = $dom->saveHTML(null, true);
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return $text;
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}
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];
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