Added convert_to_base_types()

confiddler/__init__.py

@@ -1,3 +1,3 @@
 from jsonschema import ValidationError
-from .core import load_config, dump_default_config, validate, emit_defaults, flow_style
+from .core import load_config, dump_default_config, validate, emit_defaults, flow_style, convert_to_base_types
 from . import json

confiddler/core.py

@@ -2,7 +2,7 @@
 import copy
 from os import PathLike
 from pathlib import Path
-from collections.abc import Mapping
+from collections.abc import Mapping, Sequence
 
 from jsonschema import validators
 from jsonschema.exceptions import _Error, ValidationError
@@ -425,6 +425,19 @@ def flow_style(ob):
     return l
 
 
+def convert_to_base_types(o):
+    """
+    Convert the given container into a standard dict or list (recursively).
+    This is useful if you need to pass your config to a function that is
+    hard-coded to check for dicts or lists rather than Mapping or Sequence.
+    """
+    if not isinstance(o, dict) and isinstance(o, Mapping):
+        return { k: convert_to_base_types(v) for k,v in o.items() }
+    if not isinstance(o, (list, str, bytes)) and isinstance(o, Sequence):
+        return [convert_to_base_types(i) for i in o]
+    return o
+
+
 class _Dict(dict):
     """
     This subclass allows us to tag dicts with a new attribute 'from_default'

confiddler/tests/test_core.py

@@ -5,7 +5,7 @@
 import pytest
 from ruamel.yaml import YAML
 
-from confiddler import load_config, emit_defaults, validate, dump_default_config, flow_style, ValidationError
+from confiddler import load_config, emit_defaults, validate, dump_default_config, flow_style, ValidationError, convert_to_base_types
 
 yaml = YAML()
 yaml.default_flow_style = False
@@ -297,5 +297,17 @@ def test_load_from_path():
     assert loaded['mystring'] == "DEFAULT"
 
 
+def test_convert_to_base_types():
+    d = yaml.load('{"a": [1,2,3], "b": {"x": 1, "y": 2}}')
+    assert type(d) != dict
+    assert type(d['a']) != list
+    assert type(d['b']) != dict
+
+    d2 = convert_to_base_types(d)
+    assert type(d2) == dict
+    assert type(d2['a']) == list
+    assert type(d2['b']) == dict
+
+
 if __name__ == "__main__":
     pytest.main(['-s', '--tb=native', '--pyargs', 'confiddler.tests.test_core'])