Feature/union typed arrays (#58)

Solves #53 

* Added failing test based on issue #53

* Improved support for union typed objects in arrays

lmformatenforcer/jsonschemaparser.py

@@ -10,7 +10,8 @@
 from .consts import BACKSLASH, BACKSLASH_ESCAPING_CHARACTERS, MAX_CONSECUTIVE_WHITESPACES, WHITESPACE_CHARACTERS
 
 
-_ANY_JSON_SCHEMA_DICT = {'anyOf': [{'type': type} for type in json_schema_data_formats.keys()]}
+# No need to include the 'integer' option in the anyOf, as it is a subset of 'number'
+_ANY_JSON_SCHEMA_DICT = {'anyOf': [{'type': type} for type in json_schema_data_formats.keys() if type != 'integer']}
 
 class JsonSchemaParser(CharacterLevelParser):
     ANY_JSON_OBJECT_SCHEMA: JsonSchemaObject = JsonSchemaObject(**_ANY_JSON_SCHEMA_DICT)
@@ -53,6 +54,7 @@ def __init__(self,
         self.last_non_whitespace_character = ""
 
     def add_character(self, new_character: str) -> CharacterLevelParser:
+        self.context.active_parser = self
         # Assumption: The top-most parser that can accept the character is the one that should accept it.
         # This is different from the SequenceParser, in which we need to split (union) into all options.
         receiving_idx = len(self.object_stack) - 1
@@ -73,9 +75,26 @@ def add_character(self, new_character: str) -> CharacterLevelParser:
         else:
             updated_parser.num_consecutive_whitespaces = 0
             updated_parser.last_non_whitespace_character = new_character
+
+        if isinstance(updated_parser.object_stack[-1], UnionParser) and \
+            any(isinstance(parser, (ObjectParsingState, ListParsingState)) for parser in updated_parser.object_stack[-1].parsers):
+            # If the top parser is a union parser with "advanced" (=parsers that modify the object stack) parsers inside, 
+            # we need to split the top level parser into the different options,
+            # As each "fork" can live with a different object stack, and we need to make sure they have their own ones.
+            option_json_schema_parsers = []
+            for option_parser in updated_parser.object_stack[-1].parsers:
+                option_stack = updated_parser.object_stack[:-1] + [option_parser]
+                option_parser = JsonSchemaParser(self.context, self.config, option_stack, updated_parser.num_consecutive_whitespaces)
+                option_parser.context.active_parser = option_parser
+                option_parser.last_parsed_string = last_parsed_string
+                option_json_schema_parsers.append(option_parser)
+            return UnionParser(option_json_schema_parsers)
+
         return updated_parser
 
     def get_allowed_characters(self) -> str:
+        self.context.active_parser = self
+
         allowed_character_strs = []
         for parser in reversed(self.object_stack):
             # Similar to SequenceParser, if the top object can end, we need to know to accept the next character of parser below, etc.
@@ -535,7 +554,11 @@ def add_character(self, new_character: str) -> "ListParsingState":
                 parser_to_push = item_parser
             else:
                 # If we don't require items, we can also end immediately, the Union + ForceStopParser combination achieves this
-                parser_to_push = UnionParser([item_parser, ForceStopParser()])
+                if isinstance(item_parser, UnionParser):
+                    item_parser.parsers.append(ForceStopParser())
+                    parser_to_push = item_parser
+                else:
+                    parser_to_push = UnionParser([item_parser, ForceStopParser()])
             self.root.context.active_parser.object_stack.append(parser_to_push)
         elif new_character == "]":
             self.seen_list_closer = True

tests/test_jsonschemaparser.py

@@ -303,3 +303,18 @@ def test_more_string_constraints():
         'min_4_max_6': '12_'
     }.items():
         _test_json_schema_parsing_with_string(f'{{"{k}": "{v}"}}', StringConstraints.model_json_schema(), False)
+
+
+def test_union_typed_arrays():
+    class AppleSchema(BaseModel):
+        apple_type: int
+
+    class BananaSchema(BaseModel):
+        is_ripe: bool
+
+    class FruitsSchema(BaseModel):
+        fruits: List[Union[AppleSchema, BananaSchema]]
+
+    _test_json_schema_parsing_with_string('{"fruits": [{"apple_type": 1}, {"apple_type": 2}] }', FruitsSchema.model_json_schema(), True)
+    _test_json_schema_parsing_with_string('{"fruits": [{"apple_type": 1}, {"is_ripe": true}] }', FruitsSchema.model_json_schema(), True)
+    _test_json_schema_parsing_with_string('{"fruits": [{"apple_type": 1, "is_ripe": true}] }', FruitsSchema.model_json_schema(), False)