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Fix: #163. IndexError when matching values. #164

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  • checks a value before accessing an index.

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cc: @dlongley @msporny is this still maintained?

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msporny commented Oct 6, 2022

cc: @dlongley @msporny is this still maintained?

Barely... it's not a priority for us because we no longer use Python. We've been searching for a maintainer that could take over maintenance of this library for several years now (to no avail).

We do plan on setting aside some money for a maintainer in the coming year... do you know of anyone that would be interested in maintaining the library? Our engineering team is too busy in other areas at the moment (VCs, DIDs, Data Integrity, etc... all building on top of JSON-LD 1.1).

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LGTM.

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On second thought, I'm not sure this is right when comparing it to another implementation here:

https://github.com/digitalbazaar/jsonld.js/blob/main/lib/frame.js#L813

In python, the statement not v2, when v2 is an empty array (which seems to be the case of concern here) results in True. But we are looking to return False only when v1 is actually in v2 or when v2 has a first element that is an empty object. This would erroneously return False when v2 is an empty array or isn't present (because it defaults to an empty array).

@@ -4504,7 +4504,7 @@ def _value_match(self, pattern, value):

if not v2 and not t2 and not l2:
return True
if not (v1 in v2 or _is_empty_object(v2[0])):
if not (v1 in v2 or not v2 or _is_empty_object(v2[0])):
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This should probably be:

Suggested change
if not (v1 in v2 or not v2 or _is_empty_object(v2[0])):
if not (v1 in v2 or (v2 and _is_empty_object(v2[0]))):

Ideally tests would confirm.

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Seems reasonable. I'll provide further comment in the code though.

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3 participants