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Improve traverse_obj
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7dde84f3c9
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@ -6224,37 +6224,49 @@ def load_plugins(name, suffix, namespace):
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return classes
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def traverse_obj(obj, keys, *, casesense=True, is_user_input=False, traverse_string=False):
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def traverse_obj(
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obj, *key_list, default=None, expected_type=None,
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casesense=True, is_user_input=False, traverse_string=False):
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''' Traverse nested list/dict/tuple
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@param default Default value to return
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@param expected_type Only accept final value of this type
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@param casesense Whether to consider dictionary keys as case sensitive
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@param is_user_input Whether the keys are generated from user input. If True,
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strings are converted to int/slice if necessary
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@param traverse_string Whether to traverse inside strings. If True, any
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non-compatible object will also be converted into a string
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'''
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keys = list(keys)[::-1]
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while keys:
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key = keys.pop()
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if isinstance(obj, dict):
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assert isinstance(key, compat_str)
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if not casesense:
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obj = {k.lower(): v for k, v in obj.items()}
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key = key.lower()
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obj = obj.get(key)
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else:
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if is_user_input:
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key = (int_or_none(key) if ':' not in key
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else slice(*map(int_or_none, key.split(':'))))
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if key is None:
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if not casesense:
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_lower = lambda k: k.lower() if isinstance(k, str) else k
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key_list = ((_lower(k) for k in keys) for keys in key_list)
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def _traverse_obj(obj, keys):
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for key in list(keys):
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if isinstance(obj, dict):
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obj = (obj.get(key) if casesense or (key in obj)
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else next((v for k, v in obj.items() if _lower(k) == key), None))
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else:
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if is_user_input:
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key = (int_or_none(key) if ':' not in key
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else slice(*map(int_or_none, key.split(':'))))
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if not isinstance(key, (int, slice)):
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return None
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if not isinstance(obj, (list, tuple)):
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if traverse_string:
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obj = compat_str(obj)
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else:
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if not isinstance(obj, (list, tuple)):
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if not traverse_string:
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return None
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obj = str(obj)
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try:
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obj = obj[key]
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except IndexError:
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return None
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assert isinstance(key, (int, slice))
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obj = try_get(obj, lambda x: x[key])
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return obj
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return obj
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for keys in key_list:
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val = _traverse_obj(obj, keys)
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if val is not None:
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if expected_type is None or isinstance(val, expected_type):
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return val
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return default
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def traverse_dict(dictn, keys, casesense=True):
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