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Allow string comparison #49

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merged 1 commit into from Feb 14, 2022
Merged

Allow string comparison #49

merged 1 commit into from Feb 14, 2022

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johnallen3d
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This library currently only supports "comparison" of numberic values. This appears to match the JMESPath spec but is not consistent with other implementations (for example: jmespath.py).

Resolves: #47

@johnallen3d johnallen3d force-pushed the feature/allow-string-comparison branch from 9c0cce6 to 2d4691f Compare January 31, 2022 13:52
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Hello @alextwoods, I just noticed that you've recently pushed a few updates to this repository. I've rebased this PR with main and pushed. Any chance of getting it merged? FWIW — we've been using a privately published version of the gem with these changes for ~2yrs now without issue.

@alextwoods alextwoods self-assigned this Jan 31, 2022
alextwoods
alextwoods reviewed Jan 31, 2022
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Overall the code itself looks reasonable - my main concern is that the JMESPath spec is explicit that comparisons operations are valid only for numbers and other types must return null.

Do you know if other implementations support string comparison?

lib/jmespath/nodes/comparator.rb Outdated Show resolved Hide resolved
@johnallen3d
Allow string comparison
7f0a880 
This library currently only supports "comparison" of numberic values.
This appears to match the JMESPath spec but is not consistent with other
implementations (for example:
[`jmespath.py`](jmespath/jmespath.py#126)).

Resolves: jmespath#47
@johnallen3d johnallen3d force-pushed the feature/allow-string-comparison branch from 2d4691f to 7f0a880 Compare January 31, 2022 18:12
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Thanks for the quick response @alextwoods. jmespath.py does currently support this type of comparison (not 100% sure about others). Also, when I was working on this originally, https://jmespath.org/ did also work this way (maybe it's driven by jmespath.py?). Also, I may have misinterpreted the comment here and here but I thought @jamesls was saying he was going to add this type of comparison to the spec.

FWIW - I removed the debug code and amended the commit.

@alextwoods
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Thanks for the patience - I'm working with @jamesls on possible updates on the spec. The issue is in defining the string comparisons in a way that implementations will be consistent (this gets complex, see: https://unicode.org/reports/tr10/). One possibility is to just say its utf8 encoding byte comparison.

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I'm going to go ahead and merge this and release a new version of jmespath - we'll work on getting the spec updated as well. Thanks for the contribution!

@alextwoods alextwoods merged commit 4b8773a into jmespath:main Feb 14, 2022
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This has been released as jmespath 1.6.0

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