fix(example): parse Gemma text tool bracket calls

Author: abetlen

examples/server/configs/gemma-4-12b-it-qat.json

@@ -44,7 +44,7 @@
         },
         "tool_calls": {
           "type": "array",
-          "x-regex-iterator": "<\\|tool_call>(call:[^\\{]+\\{.*?\\})<tool_call\\|>",
+          "x-regex-iterator": "<\\|tool_call>(call:[^\\{\\[]+[\\{\\[].*?[\\}\\]])<tool_call\\|>",
           "items": {
             "type": "object",
             "properties": {
@@ -56,11 +56,11 @@
                 "properties": {
                   "name": {
                     "type": "string",
-                    "x-regex": "^call:(\\w+)\\{"
+                    "x-regex": "^call:(\\w+)[\\{\\[]"
                   },
                   "arguments": {
                     "type": "object",
-                    "x-regex": "^call:\\w+(\\{.*\\})$",
+                    "x-regex": "^call:\\w+(\\{.*\\}|\\[.*\\])$",
                     "x-parser": "gemma4-tool-call",
                     "additionalProperties": true
                   }

examples/server/server.py

@@ -4389,6 +4389,9 @@ def capture(match: re.Match[str]) -> str:
             strings.append(match.group(1))
             return f"\x00{len(strings) - 1}\x00"
 
+        stripped = text.strip()
+        if stripped.startswith("[") and stripped.endswith("]"):
+            text = "{" + stripped[1:-1] + "}"
         text = re.sub(r'<\|"\|>(.*?)<\|"\|>', capture, text, flags=re.S)
         text = re.sub(r"(?<=[{,])(\w+):", r'"\1":', text)
         for index, value in enumerate(strings):