Initial commit of 001code-html Scratch frontend project.

Includes scratch-gui, scratch-vm, scratch-blocks, scratch-render, scratch-l10n, and deployment config.

Co-authored-by: Cursor <cursoragent@cursor.com>

scratch-vm/test/integration/unknown-opcode.js

@@ -0,0 +1,55 @@
+const path = require('path');
+const test = require('tap').test;
+const makeTestStorage = require('../fixtures/make-test-storage');
+const readFileToBuffer = require('../fixtures/readProjectFile').readFileToBuffer;
+const VirtualMachine = require('../../src/index');
+
+const uri = path.resolve(__dirname, '../fixtures/unknown-opcode.sb2');
+const project = readFileToBuffer(uri);
+
+test('unknown opcode', t => {
+    const vm = new VirtualMachine();
+    vm.attachStorage(makeTestStorage());
+
+    vm.start();
+    vm.clear();
+    vm.setCompatibilityMode(false);
+    vm.setTurboMode(false);
+    vm.loadProject(project).then(() => {
+        vm.greenFlag();
+
+        // The project has 3 blocks in a single stack:
+        //      play sound => "undefined" => play sound
+        // the "undefined" block has opcode "0" and was found in the wild.
+        // It should be parsed in without error and it should bridge together
+        // the two play sound blocks, so there should not be a third block.
+        const blocks = vm.runtime.targets[0].blocks;
+        const topBlockId = blocks.getScripts()[0];
+        const secondBlockId = blocks.getNextBlock(topBlockId);
+        const thirdBlockId = blocks.getNextBlock(secondBlockId);
+
+        t.equal(blocks.getBlock(topBlockId).opcode, 'sound_play');
+        t.equal(blocks.getBlock(secondBlockId).opcode, 'sound_play');
+        t.equal(thirdBlockId, null);
+
+        const target = vm.runtime.targets[0];
+        const topCommentId = blocks.getBlock(topBlockId).comment;
+        const secondCommentId = blocks.getBlock(secondBlockId).comment;
+
+        t.equal(target.comments[topCommentId].text, 'pop1 comment');
+        t.equal(target.comments[secondCommentId].text, 'pop2 comment');
+
+        // The comment previously attached to the undefined block should become
+        // a workspace comment, at 0/0, with the same text as it had.
+        const undefinedCommentId = Object.keys(target.comments).filter(id =>
+            id !== topCommentId && id !== secondCommentId)[0];
+        const undefinedComment = target.comments[undefinedCommentId];
+        t.equal(undefinedComment.blockId, null);
+        t.equal(undefinedComment.text, 'undefined comment');
+        t.equal(undefinedComment.x, 0);
+        t.equal(undefinedComment.y, 0);
+
+        vm.quit();
+        t.end();
+    });
+});