feat(blocks): add plain text block adapter for latex

packages/blocks/src/__tests__/adapters/plain-text.unit.spec.ts

@@ -565,7 +565,7 @@ describe('snapshot to plain text', () => {
     const plainTextAdapter = new PlainTextAdapter(createJob([middleware]));
 
     const plainText =
-      'aaa: https://affine.pro/\ntest: https://example.com/deadbeef?mode=page&blockIds=abc%2C123&elementIds=def%2C456\nLaTex, with value: E=mc^2\n';
+      'aaa: https://affine.pro/\ntest: https://example.com/deadbeef?mode=page&blockIds=abc%2C123&elementIds=def%2C456\nE=mc^2\n';
     const target = await plainTextAdapter.fromBlockSnapshot({
       snapshot: blockSnapshot,
     });
@@ -672,4 +672,37 @@ describe('snapshot to plain text', () => {
       });
     }
   });
+
+  test('latex block', async () => {
+    const blockSnapshot: BlockSnapshot = {
+      type: 'block',
+      id: 'matchesReplaceMap[0]',
+      flavour: 'affine:note',
+      props: {
+        xywh: '[0,0,800,95]',
+        background: DEFAULT_NOTE_BACKGROUND_COLOR,
+        index: 'a0',
+        hidden: false,
+        displayMode: NoteDisplayMode.DocAndEdgeless,
+      },
+      children: [
+        {
+          type: 'block',
+          id: 'matchesReplaceMap[1]',
+          flavour: 'affine:latex',
+          props: {
+            latex: 'E=mc^2',
+          },
+          children: [],
+        },
+      ],
+    };
+
+    const plainText = 'LaTex, with value: E=mc^2\n';
+    const plainTextAdapter = new PlainTextAdapter(createJob());
+    const target = await plainTextAdapter.fromBlockSnapshot({
+      snapshot: blockSnapshot,
+    });
+    expect(target.file).toBe(plainText);
+  });
 });

packages/blocks/src/_common/adapters/plain-text/block-matcher.ts

@@ -32,6 +32,10 @@ import {
   DividerBlockPlainTextAdapterExtension,
   dividerBlockPlainTextAdapterMatcher,
 } from '../../../divider-block/adapters/plain-text.js';
+import {
+  LatexBlockPlainTextAdapterExtension,
+  latexBlockPlainTextAdapterMatcher,
+} from '../../../latex-block/adapters/plain-text.js';
 
 export const defaultBlockPlainTextAdapterMatchers: BlockPlainTextAdapterMatcher[] =
   [
@@ -44,6 +48,7 @@ export const defaultBlockPlainTextAdapterMatchers: BlockPlainTextAdapterMatcher[
     embedGithubBlockPlainTextAdapterMatcher,
     embedLoomBlockPlainTextAdapterMatcher,
     embedYoutubeBlockPlainTextAdapterMatcher,
+    latexBlockPlainTextAdapterMatcher,
   ];
 
 export const BlockPlainTextAdapterExtensions: ExtensionType[] = [
@@ -56,4 +61,5 @@ export const BlockPlainTextAdapterExtensions: ExtensionType[] = [
   EmbedGithubBlockPlainTextAdapterExtension,
   EmbedLoomBlockPlainTextAdapterExtension,
   EmbedYoutubeBlockPlainTextAdapterExtension,
+  LatexBlockPlainTextAdapterExtension,
 ];

packages/blocks/src/_common/adapters/plain-text/delta-converter/inline-delta.ts

@@ -65,7 +65,7 @@ export const latexDeltaMarkdownAdapterMatch: InlineDeltaToPlainTextAdapterMatche
         return node;
       }
       return {
-        content: `LaTex, with value: ${delta.attributes?.latex}`,
+        content: delta.attributes?.latex,
       };
     },
   };

packages/blocks/src/latex-block/adapters/index.ts

@@ -0,0 +1,2 @@
+export * from './markdown.js';
+export * from './plain-text.js';

packages/blocks/src/latex-block/adapters/plain-text.ts

@@ -0,0 +1,29 @@
+import { LatexBlockSchema } from '@blocksuite/affine-model';
+import {
+  BlockPlainTextAdapterExtension,
+  type BlockPlainTextAdapterMatcher,
+} from '@blocksuite/affine-shared/adapters';
+
+const latexPrefix = 'LaTex, with value: ';
+
+export const latexBlockPlainTextAdapterMatcher: BlockPlainTextAdapterMatcher = {
+  flavour: LatexBlockSchema.model.flavour,
+  toMatch: () => false,
+  fromMatch: o => o.node.flavour === LatexBlockSchema.model.flavour,
+  toBlockSnapshot: {},
+  fromBlockSnapshot: {
+    enter: (o, context) => {
+      const latex =
+        'latex' in o.node.props ? (o.node.props.latex as string) : '';
+
+      const { textBuffer } = context;
+      if (latex) {
+        textBuffer.content += `${latexPrefix}${latex}`;
+        textBuffer.content += '\n';
+      }
+    },
+  },
+};
+
+export const LatexBlockPlainTextAdapterExtension =
+  BlockPlainTextAdapterExtension(latexBlockPlainTextAdapterMatcher);

packages/blocks/src/latex-block/index.ts

@@ -1,3 +1,3 @@
-export * from './adapters/markdown.js';
+export * from './adapters/index.js';
 export * from './latex-block.js';
 export * from './latex-spec.js';