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[utils] traverse_obj: Support xml.etree.ElementTree.Element (#8911)

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Authored by: Grub4K
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Simon Sawicki 2024-01-05 21:26:17 +01:00 committed by GitHub
parent 292d60b1ed
commit ffbd4f2a02
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2 changed files with 84 additions and 3 deletions
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52
test/test_utils.py
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@ -2340,6 +2340,58 @@ Line 1
self.assertEqual(traverse_obj(mobj, lambda k, _: k in (0, 'group')), ['0123', '3'],
msg='function on a `re.Match` should give group name as well')
# Test xml.etree.ElementTree.Element as input obj
etree = xml.etree.ElementTree.fromstring('''<?xml version="1.0"?>
<data>
<country name="Liechtenstein">
<rank>1</rank>
<year>2008</year>
<gdppc>141100</gdppc>
<neighbor name="Austria" direction="E"/>
<neighbor name="Switzerland" direction="W"/>
</country>
<country name="Singapore">
<rank>4</rank>
<year>2011</year>
<gdppc>59900</gdppc>
<neighbor name="Malaysia" direction="N"/>
</country>
<country name="Panama">
<rank>68</rank>
<year>2011</year>
<gdppc>13600</gdppc>
<neighbor name="Costa Rica" direction="W"/>
<neighbor name="Colombia" direction="E"/>
</country>
</data>''')
self.assertEqual(traverse_obj(etree, ''), etree,
msg='empty str key should return the element itself')
self.assertEqual(traverse_obj(etree, 'country'), list(etree),
msg='str key should lead all children with that tag name')
self.assertEqual(traverse_obj(etree, ...), list(etree),
msg='`...` as key should return all children')
self.assertEqual(traverse_obj(etree, lambda _, x: x[0].text == '4'), [etree[1]],
msg='function as key should get element as value')
self.assertEqual(traverse_obj(etree, lambda i, _: i == 1), [etree[1]],
msg='function as key should get index as key')
self.assertEqual(traverse_obj(etree, 0), etree[0],
msg='int key should return the nth child')
self.assertEqual(traverse_obj(etree, './/neighbor/@name'),
['Austria', 'Switzerland', 'Malaysia', 'Costa Rica', 'Colombia'],
msg='`@<attribute>` at end of path should give that attribute')
self.assertEqual(traverse_obj(etree, '//neighbor/@fail'), [None, None, None, None, None],
msg='`@<nonexistant>` at end of path should give `None`')
self.assertEqual(traverse_obj(etree, ('//neighbor/@', 2)), {'name': 'Malaysia', 'direction': 'N'},
msg='`@` should give the full attribute dict')
self.assertEqual(traverse_obj(etree, '//year/text()'), ['2008', '2011', '2011'],
msg='`text()` at end of path should give the inner text')
self.assertEqual(traverse_obj(etree, '//*[@direction]/@direction'), ['E', 'W', 'N', 'W', 'E'],
msg='full python xpath features should be supported')
self.assertEqual(traverse_obj(etree, (0, '@name')), 'Liechtenstein',
msg='special transformations should act on current element')
self.assertEqual(traverse_obj(etree, ('country', 0, ..., 'text()', {int_or_none})), [1, 2008, 141100],
msg='special transformations should act on current element')
def test_http_header_dict(self):
headers = HTTPHeaderDict()
headers['ytdl-test'] = b'0'

35
yt_dlp/utils/traversal.py
View file

@ -3,6 +3,7 @@ import contextlib
import inspect
import itertools
import re
import xml.etree.ElementTree
from ._utils import (
IDENTITY,
@ -118,7 +119,7 @@ def traverse_obj(
branching = True
if isinstance(obj, collections.abc.Mapping):
result = obj.values()
elif is_iterable_like(obj):
elif is_iterable_like(obj) or isinstance(obj, xml.etree.ElementTree.Element):
result = obj
elif isinstance(obj, re.Match):
result = obj.groups()
@ -132,7 +133,7 @@ def traverse_obj(
branching = True
if isinstance(obj, collections.abc.Mapping):
iter_obj = obj.items()
elif is_iterable_like(obj):
elif is_iterable_like(obj) or isinstance(obj, xml.etree.ElementTree.Element):
iter_obj = enumerate(obj)
elif isinstance(obj, re.Match):
iter_obj = itertools.chain(
@ -168,7 +169,7 @@ def traverse_obj(
result = next((v for k, v in obj.groupdict().items() if casefold(k) == key), None)
elif isinstance(key, (int, slice)):
if is_iterable_like(obj, collections.abc.Sequence):
if is_iterable_like(obj, (collections.abc.Sequence, xml.etree.ElementTree.Element)):
branching = isinstance(key, slice)
with contextlib.suppress(IndexError):
result = obj[key]
@ -176,6 +177,34 @@ def traverse_obj(
with contextlib.suppress(IndexError):
result = str(obj)[key]
elif isinstance(obj, xml.etree.ElementTree.Element) and isinstance(key, str):
xpath, _, special = key.rpartition('/')
if not special.startswith('@') and special != 'text()':
xpath = key
special = None
# Allow abbreviations of relative paths, absolute paths error
if xpath.startswith('/'):
xpath = f'.{xpath}'
elif xpath and not xpath.startswith('./'):
xpath = f'./{xpath}'
def apply_specials(element):
if special is None:
return element
if special == '@':
return element.attrib
if special.startswith('@'):
return try_call(element.attrib.get, args=(special[1:],))
if special == 'text()':
return element.text
assert False, f'apply_specials is missing case for {special!r}'
if xpath:
result = list(map(apply_specials, obj.iterfind(xpath)))
else:
result = apply_specials(obj)
return branching, result if branching else (result,)
def lazy_last(iterable):