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[devalue] add code comments

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Authored by: bashonly
This commit is contained in:
bashonly 2025-06-11 13:36:50 -05:00
parent 39cb150d76
commit ac834cb366
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1 changed files with 3 additions and 0 deletions
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yt_dlp/utils/web/devalue.py
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@ -33,6 +33,7 @@
def parse_iter(parsed: typing.Any, /, *, revivers: dict[str, collections.abc.Callable[[list], typing.Any]] | None = None): def parse_iter(parsed: typing.Any, /, *, revivers: dict[str, collections.abc.Callable[[list], typing.Any]] | None = None):
# based on https://github.com/Rich-Harris/devalue/blob/f3fd2aa93d79f21746555671f955a897335edb1b/src/parse.js
resolved = { resolved = {
-1: None, -1: None,
-2: None, -2: None,
@ -69,6 +70,7 @@ def parse_iter(parsed: typing.Any, /, *, revivers: dict[str, collections.abc.Cal
target[index] = resolved[source] target[index] = resolved[source]
continue continue
# guard against Python negative indexing
if source < 0: if source < 0:
yield IndexError(f'invalid index: {source!r}') yield IndexError(f'invalid index: {source!r}')
continue continue
@ -79,6 +81,7 @@ def parse_iter(parsed: typing.Any, /, *, revivers: dict[str, collections.abc.Cal
# TODO: implement zips `strict=True` # TODO: implement zips `strict=True`
if reviver := revivers.get(value[0]): if reviver := revivers.get(value[0]):
if value[1] == source: if value[1] == source:
# XXX: avoid infinite loop
yield IndexError(f'{value[0]!r} cannot point to itself (index: {source})') yield IndexError(f'{value[0]!r} cannot point to itself (index: {source})')
continue continue
# inverse order: resolve index, revive value # inverse order: resolve index, revive value