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[utils] traverse_obj: More fixes (#6959)

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- Fix result when branching with `traverse_string`
- Fix `slice` path on `dict`s
- Fix tests and docstrings from 21b5ec86c2
- Add `is_iterable_like` helper function

Authored by: Grub4K
This commit is contained in:
Simon Sawicki 2023-04-30 19:50:22 +02:00 committed by GitHub
parent 4d9280c9c8
commit b079c26f0a
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 37 additions and 12 deletions
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21
test/test_utils.py
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@ -2016,7 +2016,7 @@ Line 1
msg='nested `...` queries should work')
self.assertCountEqual(traverse_obj(_TEST_DATA, (..., ..., 'index')), range(4),
msg='`...` query result should be flattened')
self.assertEqual(traverse_obj(range(4), ...), list(range(4)),
self.assertEqual(traverse_obj(iter(range(4)), ...), list(range(4)),
msg='`...` should accept iterables')
# Test function as key
@ -2025,7 +2025,7 @@ Line 1
msg='function as query key should perform a filter based on (key, value)')
self.assertCountEqual(traverse_obj(_TEST_DATA, lambda _, x: isinstance(x[0], str)), {'str'},
msg='exceptions in the query function should be catched')
self.assertEqual(traverse_obj(range(4), lambda _, x: x % 2 == 0), [0, 2],
self.assertEqual(traverse_obj(iter(range(4)), lambda _, x: x % 2 == 0), [0, 2],
msg='function key should accept iterables')
if __debug__:
with self.assertRaises(Exception, msg='Wrong function signature should raise in debug'):
@ -2051,6 +2051,17 @@ Line 1
with self.assertRaises(Exception, msg='Sets with length != 1 should raise in debug'):
traverse_obj(_TEST_DATA, {str.upper, str})
# Test `slice` as a key
_SLICE_DATA = [0, 1, 2, 3, 4]
self.assertEqual(traverse_obj(_TEST_DATA, ('dict', slice(1))), None,
msg='slice on a dictionary should not throw')
self.assertEqual(traverse_obj(_SLICE_DATA, slice(1)), _SLICE_DATA[:1],
msg='slice key should apply slice to sequence')
self.assertEqual(traverse_obj(_SLICE_DATA, slice(1, 2)), _SLICE_DATA[1:2],
msg='slice key should apply slice to sequence')
self.assertEqual(traverse_obj(_SLICE_DATA, slice(1, 4, 2)), _SLICE_DATA[1:4:2],
msg='slice key should apply slice to sequence')
# Test alternative paths
self.assertEqual(traverse_obj(_TEST_DATA, 'fail', 'str'), 'str',
msg='multiple `paths` should be treated as alternative paths')
@ -2234,6 +2245,12 @@ Line 1
self.assertEqual(traverse_obj(_TRAVERSE_STRING_DATA, ('str', (0, 2)),
traverse_string=True), ['s', 'r'],
msg='branching should result in list if `traverse_string`')
self.assertEqual(traverse_obj({}, (0, ...), traverse_string=True), [],
msg='branching should result in list if `traverse_string`')
self.assertEqual(traverse_obj({}, (0, lambda x, y: True), traverse_string=True), [],
msg='branching should result in list if `traverse_string`')
self.assertEqual(traverse_obj({}, (0, slice(1)), traverse_string=True), [],
msg='branching should result in list if `traverse_string`')
# Test is_user_input behavior
_IS_USER_INPUT_DATA = {'range8': list(range(8))}

28
yt_dlp/utils.py
View file

@ -3273,8 +3273,14 @@ def multipart_encode(data, boundary=None):
return out, content_type
def variadic(x, allowed_types=(str, bytes, dict)):
return x if isinstance(x, collections.abc.Iterable) and not isinstance(x, allowed_types) else (x,)
def is_iterable_like(x, allowed_types=collections.abc.Iterable, blocked_types=NO_DEFAULT):
if blocked_types is NO_DEFAULT:
blocked_types = (str, bytes, collections.abc.Mapping)
return isinstance(x, allowed_types) and not isinstance(x, blocked_types)
def variadic(x, allowed_types=NO_DEFAULT):
return x if is_iterable_like(x, blocked_types=allowed_types) else (x,)
def dict_get(d, key_or_keys, default=None, skip_false_values=True):
@ -5467,7 +5473,7 @@ def traverse_obj(
obj, *paths, default=NO_DEFAULT, expected_type=None, get_all=True,
casesense=True, is_user_input=False, traverse_string=False):
"""
Safely traverse nested `dict`s and `Sequence`s
Safely traverse nested `dict`s and `Iterable`s
>>> obj = [{}, {"key": "value"}]
>>> traverse_obj(obj, (1, "key"))
@ -5475,7 +5481,7 @@ def traverse_obj(
Each of the provided `paths` is tested and the first producing a valid result will be returned.
The next path will also be tested if the path branched but no results could be found.
Supported values for traversal are `Mapping`, `Sequence` and `re.Match`.
Supported values for traversal are `Mapping`, `Iterable` and `re.Match`.
Unhelpful values (`{}`, `None`) are treated as the absence of a value and discarded.
The paths will be wrapped in `variadic`, so that `'key'` is conveniently the same as `('key', )`.
@ -5492,7 +5498,7 @@ def traverse_obj(
Read as: `[traverse_obj(obj, branch) for branch in branches]`.
- `function`: Branch out and return values filtered by the function.
Read as: `[value for key, value in obj if function(key, value)]`.
For `Sequence`s, `key` is the index of the value.
For `Iterable`s, `key` is the index of the value.
For `re.Match`es, `key` is the group number (0 = full match)
as well as additionally any group names, if given.
- `dict` Transform the current object and return a matching dict.
@ -5540,7 +5546,9 @@ def traverse_obj(
result = None
if obj is None and traverse_string:
pass
if key is ... or callable(key) or isinstance(key, slice):
branching = True
result = ()
elif key is None:
result = obj
@ -5563,7 +5571,7 @@ def traverse_obj(
branching = True
if isinstance(obj, collections.abc.Mapping):
result = obj.values()
elif isinstance(obj, collections.abc.Iterable) and not isinstance(obj, (str, bytes)):
elif is_iterable_like(obj):
result = obj
elif isinstance(obj, re.Match):
result = obj.groups()
@ -5577,7 +5585,7 @@ def traverse_obj(
branching = True
if isinstance(obj, collections.abc.Mapping):
iter_obj = obj.items()
elif isinstance(obj, collections.abc.Iterable) and not isinstance(obj, (str, bytes)):
elif is_iterable_like(obj):
iter_obj = enumerate(obj)
elif isinstance(obj, re.Match):
iter_obj = itertools.chain(
@ -5601,7 +5609,7 @@ def traverse_obj(
} or None
elif isinstance(obj, collections.abc.Mapping):
result = (obj.get(key) if casesense or (key in obj) else
result = (try_call(obj.get, args=(key,)) if casesense or try_call(obj.__contains__, args=(key,)) else
next((v for k, v in obj.items() if casefold(k) == key), None))
elif isinstance(obj, re.Match):
@ -5613,7 +5621,7 @@ def traverse_obj(
result = next((v for k, v in obj.groupdict().items() if casefold(k) == key), None)
elif isinstance(key, (int, slice)):
if isinstance(obj, collections.abc.Sequence) and not isinstance(obj, (str, bytes)):
if is_iterable_like(obj, collections.abc.Sequence):
branching = isinstance(key, slice)
with contextlib.suppress(IndexError):
result = obj[key]