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Fixes a performance bug in the Style class.

Essentially the hash calculation was inconsistent. Things that were equal would sometimes have different hashes. I noticed this when adding lru_cache to Style.__add__. What should have been an easy win caused dramatically reduced performance, because it broken the mechanics of storing Styles in a dict.

The hashing is now in once place. It is also lazy, so the hash is stored the first time it is used.

@willmcgugan willmcgugan changed the title fix hash Fixed Style hash Jun 15, 2022
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codecov-commenter commented Jun 15, 2022

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Codecov Report

Attention: Patch coverage is 98.83721% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.71%. Comparing base (14d47c9) to head (3bc9b28).
Report is 1034 commits behind head on master.

Files with missing lines Patch % Lines
rich/style.py 95.83% 1 Missing ⚠️

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Additional details and impacted files
@@            Coverage Diff             @@
##           master    #2346      +/-   ##
==========================================
- Coverage   98.88%   98.71%   -0.18%     
==========================================
  Files          73       73              
  Lines        7629     7761     +132     
==========================================
+ Hits         7544     7661     +117     
- Misses         85      100      +15     
Flag Coverage Δ
unittests 98.71% <98.83%> (-0.18%) ⬇️

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@willmcgugan willmcgugan marked this pull request as draft June 15, 2022 20:13
@willmcgugan willmcgugan requested review from darrenburns and olivierphi and removed request for darrenburns and olivierphi June 15, 2022 20:13
@willmcgugan willmcgugan marked this pull request as ready for review June 15, 2022 20:14
@willmcgugan willmcgugan marked this pull request as draft June 15, 2022 20:57
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LGTM 🙂

@willmcgugan willmcgugan marked this pull request as ready for review June 17, 2022 09:49
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4 participants