1 files changed, 59 insertions, 0 deletions
diff --git a/configlib/model_impl.py b/configlib/model_impl.py
new file mode 100644
index 0000000..4b7a866
--- /dev/null
+++ b/configlib/model_impl.py
@@ -0,0 +1,59 @@
+from typing import TypeVar, Type, Dict, List
+
+from .model import Config, ConfigValueMissingException, InvalidConfigTypingException
+from .util import snake_case
+
+_T = TypeVar('_T', bound=Config)
+
+_T0 = TypeVar('_T0')
+
+
+def parse_list_impl(cls: Type[_T0], data, path=''):
+    lis = []
+    for i, item in enumerate(data):
+        list.append(parse_single_item(cls, item, path + '[' + str(i) + ']'))
+    return lis
+
+
+def parse_obj_impl(cls: Type[_T0], data, path='Config') -> _T0:
+    obj = cls()
+    annotations: Dict[str, Type] = obj.__annotations__
+    for key, val_type in annotations.items():
+        if key not in data.keys():
+            raise ConfigValueMissingException(path + key)
+        val = data[key]
+        setattr(obj, key, parse_single_item(val_type, val, path + '.' + key))
+    return obj
+
+
+def parse_dict_impl(val_type: Type[_T0], val, path) -> _T0:
+    dic = {}
+    for key, value in val.items():
+        dic[key] = parse_single_item(val_type, value, path + '[' + repr(key) + ']')
+    return dic
+
+
+def parse_single_item(val_type: Type[_T0], val, path) -> _T0:
+    if issubclass(val_type, (str, int, float)):
+        return val
+    if isinstance(val_type, List):
+        if len(val_type.__args__) != 1:
+            raise InvalidConfigTypingException(path + ': List must be supplied exactly one type')
+        return parse_list_impl(val_type.__args__[0], val, path)
+    if isinstance(val_type, Dict):
+        if len(val_type.__args__) != 2:
+            raise InvalidConfigTypingException(path + ': Dict must be supplied exactly two types')
+        if val_type.__args__[0] != str:
+            raise InvalidConfigTypingException(path + ': Dict must have `str` as indexing')
+        return parse_dict_impl(val_type.__args__[1], val, path)
+    return parse_obj_impl(val_type, val, path)
+
+
+class BaseConfig(Config):
+    @classmethod
+    def get_name(cls) -> str:
+        return snake_case(cls.__name__).upper()
+
+    @classmethod
+    def parse_dict(cls: Type[_T], data: dict) -> _T:
+        return parse_obj_impl(cls, data)