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[utils] Improve traverse_obj

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* Allow skipping a level: `traverse_obj([{k:v1}, {k:v2}], (None, k))` => `[v1, v2]`
* Make keys variadic: `traverse_obj(obj, k1: str, k2: str)` => `traverse_obj(obj, (k1,), (k2,))`
* Fetch from multiple keys: `traverse_obj([{k1:[1], k2:[2], k3:[3]}], (0, (k1, k2), 0))` => `[1, 2]`

TODO: Add tests
This commit is contained in:
pukkandan 2021-07-15 20:22:49 +05:30
parent 0ba692acc8
commit 8f3343809e
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GPG Key ID: 0F00D95A001F4698
1 changed files with 37 additions and 9 deletions
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46
yt_dlp/utils.py
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@ -6225,9 +6225,14 @@ def load_plugins(name, suffix, namespace):
def traverse_obj(
obj, *key_list, default=None, expected_type=None,
obj, *path_list, default=None, expected_type=None,
casesense=True, is_user_input=False, traverse_string=False):
''' Traverse nested list/dict/tuple
@param path_list A list of paths which are checked one by one.
Each path is a list of keys where each key is a string,
a tuple of strings or "...". When a tuple is given,
all the keys given in the tuple are traversed, and
"..." traverses all the keys in the object
@param default Default value to return
@param expected_type Only accept final value of this type
@param casesense Whether to consider dictionary keys as case sensitive
@ -6235,23 +6240,38 @@ def traverse_obj(
strings are converted to int/slice if necessary
@param traverse_string Whether to traverse inside strings. If True, any
non-compatible object will also be converted into a string
# TODO: Write tests
'''
if not casesense:
_lower = lambda k: k.lower() if isinstance(k, str) else k
key_list = ((_lower(k) for k in keys) for keys in key_list)
path_list = (map(_lower, variadic(path)) for path in path_list)
def _traverse_obj(obj, keys):
for key in list(keys):
if isinstance(obj, dict):
def _traverse_obj(obj, path, _current_depth=0):
nonlocal depth
path = tuple(variadic(path))
for i, key in enumerate(path):
if isinstance(key, (list, tuple)):
obj = [_traverse_obj(obj, sub_key, _current_depth) for sub_key in key]
key = ...
if key is ...:
obj = (obj.values() if isinstance(obj, dict)
else obj if isinstance(obj, (list, tuple, LazyList))
else str(obj) if traverse_string else [])
_current_depth += 1
depth = max(depth, _current_depth)
return [_traverse_obj(inner_obj, path[i + 1:], _current_depth) for inner_obj in obj]
elif isinstance(obj, dict):
obj = (obj.get(key) if casesense or (key in obj)
else next((v for k, v in obj.items() if _lower(k) == key), None))
else:
if is_user_input:
key = (int_or_none(key) if ':' not in key
else slice(*map(int_or_none, key.split(':'))))
if key == slice(None):
return _traverse_obj(obj, (..., *path[i + 1:]))
if not isinstance(key, (int, slice)):
return None
if not isinstance(obj, (list, tuple)):
if not isinstance(obj, (list, tuple, LazyList)):
if not traverse_string:
return None
obj = str(obj)
@ -6261,10 +6281,18 @@ def traverse_obj(
return None
return obj
for keys in key_list:
val = _traverse_obj(obj, keys)
for path in path_list:
depth = 0
val = _traverse_obj(obj, path)
if val is not None:
if expected_type is None or isinstance(val, expected_type):
if depth:
for _ in range(depth - 1):
val = itertools.chain.from_iterable(filter(None, val))
val = (list(filter(None, val)) if expected_type is None
else [v for v in val if isinstance(v, expected_type)])
if val:
return val
elif expected_type is None or isinstance(val, expected_type):
return val
return default