feat(macos): add Canvas A2UI renderer

vendor/a2ui/specification/0.9/eval/src/utils.ts

@@ -0,0 +1,44 @@
+/*
+ Copyright 2025 Google LLC
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+export function extractJsonFromMarkdown(markdown: string): any[] {
+  const jsonBlockRegex = /```json\s*([\s\S]*?)\s*```/g;
+  const matches = [...markdown.matchAll(jsonBlockRegex)];
+  const results: any[] = [];
+
+  for (const match of matches) {
+    if (match[1]) {
+      const content = match[1].trim();
+      // Try parsing as a single JSON object first
+      try {
+        results.push(JSON.parse(content));
+      } catch (error) {
+        // If that fails, try parsing as JSONL (line by line)
+        const lines = content.split("\n");
+        for (const line of lines) {
+          if (line.trim()) {
+            try {
+              results.push(JSON.parse(line));
+            } catch (e2) {
+              // Ignore invalid lines
+            }
+          }
+        }
+      }
+    }
+  }
+  return results;
+}