snapshot of https://github.com/toeverything/AFFiNE.git (canary, 2026-09-16; blobs > 131072B omitted)

blocksuite/affine/blocks/code/src/adapters/markdown/preprocessor.ts

@@ -0,0 +1,76 @@
+import {
+  type MarkdownAdapterPreprocessor,
+  MarkdownPreprocessorExtension,
+} from '@blocksuite/affine-shared/adapters';
+import { isValidUrl } from '@blocksuite/affine-shared/utils';
+
+const codePreprocessor: MarkdownAdapterPreprocessor = {
+  name: 'code',
+  levels: ['slice'],
+  preprocess: content => {
+    let codeFence = '';
+    const lines = content
+      .split('\n')
+      .map(line => {
+        if (line.trimStart().startsWith('-')) {
+          return line;
+        }
+        let trimmedLine = line.trimStart();
+        if (!codeFence && trimmedLine.startsWith('```')) {
+          codeFence = trimmedLine.substring(
+            0,
+            trimmedLine.lastIndexOf('```') + 3
+          );
+          if (codeFence.split('').every(c => c === '`')) {
+            return line;
+          }
+          codeFence = '';
+        }
+        if (!codeFence && trimmedLine.startsWith('~~~')) {
+          codeFence = trimmedLine.substring(
+            0,
+            trimmedLine.lastIndexOf('~~~') + 3
+          );
+          if (codeFence.split('').every(c => c === '~')) {
+            return line;
+          }
+          codeFence = '';
+        }
+        if (
+          !!codeFence &&
+          trimmedLine.startsWith(codeFence) &&
+          trimmedLine.lastIndexOf(codeFence) === 0
+        ) {
+          codeFence = '';
+        }
+        if (codeFence) {
+          return line;
+        }
+
+        trimmedLine = trimmedLine.trimEnd();
+        if (
+          !trimmedLine.startsWith('<') &&
+          !trimmedLine.endsWith('>') &&
+          !trimmedLine.includes(' ')
+        ) {
+          // check if it is a url link and wrap it with the angle brackets
+          // sometimes the url includes emphasis `_` that will break URL parsing
+          //
+          // eg. /MuawcBMT1Mzvoar09-_66?mode=page&blockIds=rL2_GXbtLU2SsJVfCSmh_
+          // https://www.markdownguide.org/basic-syntax/#urls-and-email-addresses
+          const valid = isValidUrl(trimmedLine);
+          if (valid) {
+            return `<${trimmedLine}>`;
+          }
+        }
+
+        return line.replace(/^ /, '&#x20;');
+      })
+      .join('\n');
+
+    return lines;
+  },
+};
+
+export const CodeMarkdownPreprocessorExtension =
+  MarkdownPreprocessorExtension(codePreprocessor);