Start work on docker module

sia/util.py

@@ -1,7 +1,8 @@
-from .inference_result import InferenceResult
-
-import xml.etree.ElementTree as ET
+from typing import Iterator, TypeVar
 import re
+import xml.etree.ElementTree as ET
+
+from .inference_result import InferenceResult
 
 def get_valid_root_elements(schema: str) -> set:
     """
@@ -44,4 +45,25 @@ def split_response(response: str, valid_elements: set) -> InferenceResult:
     split_point = last_match.start()
     reasoning = response[:split_point].strip()
     actions = response[split_point:].strip()
-    return InferenceResult(reasoning, actions)
+    return InferenceResult(reasoning, actions)
+
+def stop_before_value(iterator: Iterator[str], stop_value: str) -> Iterator[str]:
+    """
+    Creates an iterator that yields values from the input iterator
+    until it encounters the stop_value (exclusive).
+    
+    Args:
+        iterator: The source iterator
+        stop_value: The value to stop before
+        
+    Yields:
+        Values from the iterator until stop_value is encountered
+        If stop_value is part of an item, yields the part before stop_value
+    """
+    for item in iterator:
+        if stop_value in item:
+            split_point = item.index(stop_value)
+            if split_point > 0:
+                yield item[:split_point]
+            break
+        yield item