✨ Rewrite for Kirby

site/plugins/kirby-highlighter/extensions/fieldmethods.php

@@ -0,0 +1,23 @@
+<?php
+
+if (!function_exists('is_base64_string_s')) {
+    // https://stackoverflow.com/a/51877882
+    function is_base64_string_s(string $str, $enc = ['UTF-8', 'ASCII'])
+    {
+        return !(($b = base64_decode($str, true)) === false) && in_array(mb_detect_encoding($b), $enc);
+    }
+}
+
+return [
+    'fromBase64' => function ($field) {
+        if ($field->isNotEmpty()) {
+            $value = trim((string)$field->value());
+
+            if (is_base64_string_s($value)) {
+                $field->value = base64_decode($value);
+            }
+        }
+
+        return $field;
+    },
+];

site/plugins/kirby-highlighter/extensions/hooks.php

@@ -0,0 +1,86 @@
+<?php
+
+use Highlight\Highlighter;
+use JohannSchopplich\HTML5DOMDocument;
+use Kirby\Cms\App;
+
+return [
+    'kirbytext:after' => function (string|null $text) {
+        $kirby = App::instance();
+
+        // Parse KirbyText input as HTML document
+        $dom = new HTML5DOMDocument();
+        $dom->loadHTML($text);
+
+        // Retrieve all `pre` elements inside newly created HTML document
+        $preNodes = $dom->getElementsByTagName('pre');
+
+        // Bail if no `pre` elements have been found
+        if ($preNodes->length === 0) {
+            return $text;
+        }
+
+        // Loop through all `pre` elements
+        foreach ($preNodes as $preNode) {
+            // Ensure nothing but the `code` element exists
+            if ($preNode->childNodes->length !== 1) {
+                continue;
+            }
+
+            // Select direct `code` child element of `pre` block
+            $codeNode = $preNode->firstChild;
+
+            // Get language code if present
+            $language = $codeNode->getAttribute('class');
+            if (str_starts_with($language, 'language-')) {
+                $language = preg_replace('/^language-/', '', $language);
+            }
+
+            // Bail highlighting if language isn't set and auto detection is disabled
+            if (empty($language) && !$kirby->option('johannschopplich.highlighter.autodetect', false)) {
+                continue;
+            }
+
+            // Add `hljs` class to `pre` block
+            $preNode->setAttribute('class', $kirby->option('johannschopplich.highlighter.class', 'hljs'));
+
+            // Get raw code data to highlight
+            $code = $codeNode->nodeValue;
+
+            // Remove code element afterwards
+            $preNode->removeChild($codeNode);
+
+            // Initiate `Highlighter` and use pre-defined language code, fall
+            // back to language auto detection if enabled
+            $highlighter = new Highlighter();
+
+            // Highlight code
+            if (!empty($language)) {
+                $highlightedCode = $highlighter->highlight($language, $code);
+            } elseif ($kirby->option('johannschopplich.highlighter.autodetect', false)) {
+                $languageSubset = $kirby->option('johannschopplich.highlighter.languages', []);
+                if (!empty($languageSubset)) {
+                    $highlighter->setAutodetectLanguages($languageSubset);
+                }
+
+                $highlightedCode = $highlighter->highlightAuto($code);
+            }
+
+            // Line numbering
+            if ($kirby->option('johannschopplich.highlighter.line-numbering', false)) {
+                $lines = preg_split('/\R/', $highlightedCode->value);
+                $lineClass = $kirby->option('johannschopplich.highlighter.line-numbering-class', 'hljs-code-line');
+                $highlightedCode->value = '<span class="' . $lineClass . '">' . implode("</span>\n<span class=\"$lineClass\">", $lines) . '</span>';
+            }
+
+            // Append highlighted wrapped in `code` block to parent `pre`
+            $codeNode = $dom->createDocumentFragment();
+            $codeNode->appendXML('<code data-language="' . $language . '">' . $highlightedCode->value . '</code>');
+            $preNode->appendChild($codeNode);
+        }
+
+        // Save all changes
+        $text = $dom->saveHTML(null, true);
+        return $text;
+    }
+];

site/plugins/kirby-highlighter/extensions/kirbytags.php

@@ -0,0 +1,27 @@
+<?php
+
+use Kirby\Cms\App;
+
+return [
+    'code' => [
+        'attr' => [
+            'lang',
+            'language',
+        ],
+        // TODO: Type as `\Kirby\Text\KirbyTag` for Kirby 4
+        'html' => function ($tag) {
+            $kirby = App::instance();
+            $code = $tag->value;
+            $language = $tag->lang ?? $tag->language;
+            $block = new \Kirby\Cms\Block([
+                'type' => 'code',
+                'content' => [
+                    'language' => $language ?? 'plaintext',
+                    'code' => is_base64_string_s($code) ? base64_decode($code) : $code,
+                ]
+            ]);
+
+            return $kirby->snippet('blocks/code', ['block' => $block], true);
+        }
+    ]
+];