add mergeable field for annotation

dedoc/data_structures/annotation.py

@@ -12,7 +12,7 @@ class Annotation(Serializable):
     Look to the concrete kind of annotations to get mode examples.
     """
 
-    def __init__(self, start: int, end: int, name: str, value: str) -> None:
+    def __init__(self, start: int, end: int, name: str, value: str, mergeable: bool = True) -> None:
         """
         Some kind of text information about symbols between start and end.
         For example Annotation(1, 13, "italic", "True") says that text between 1st and 13th symbol was writen in italic.
@@ -21,11 +21,13 @@ def __init__(self, start: int, end: int, name: str, value: str) -> None:
         :param end: end of the annotated text (end isn't included)
         :param name: annotation's name
         :param value: information about annotated text
+        :param mergeable: is it possible to merge annotations with the same value
         """
         self.start = start
         self.end = end
         self.name = name
         self.value = value
+        self.mergeable = mergeable
 
     def __eq__(self, o: object) -> bool:
         if not isinstance(o, Annotation):

dedoc/data_structures/concrete_annotations/confidence_annotation.py

@@ -21,7 +21,7 @@ def __init__(self, start: int, end: int, value: str) -> None:
             raise ValueError("the value of confidence annotation should be float value")
         except AssertionError:
             raise ValueError("the value of confidence annotation should be in range [0, 100]")
-        super().__init__(start=start, end=end, name=ConfidenceAnnotation.name, value=value)
+        super().__init__(start=start, end=end, name=ConfidenceAnnotation.name, value=value, mergeable=False)
 
     @staticmethod
     def get_api_dict(api: Api) -> Model:

dedoc/utils/annotation_merger.py

@@ -82,7 +82,7 @@ def _merge_one_group(self, annotations: List[Annotation], spaces: List[Space]) -
         """
         Merge one group annotations, assume that all annotations has the same name and value
         """
-        if len(annotations) <= 1:
+        if len(annotations) <= 1 or not annotations[0].mergeable:
             return annotations
         self.__check_annotations_group(annotations)
         result = []