varjujan added inline comments.
================
Comment at:
clang-tools-extra/clang-tidy/readability/SuspiciousCallArgumentCheck.cpp:51
+ {true, 40, 50}, // Substring.
+ {true, 50, 66}, // Levenshtein.
+ {true, 75, 85}, // Jaro-Winkler.
----------------
whisperity wrote:
> aaron.ballman wrote:
> > We should probably document where all these numbers come from, but `66`
> > definitely jumps out at me as being a bit strange. :-D
> Unfortunately, I have absolutely no idea. All these values are percentages
> between 0 and 100 (`-1` is just saying that //"This heuristic doesn't accept
> percentages"//), and this is written in the documentation now. However, the
> answer to //"**why** 66%?"//, unless @varjujan can say something, I think is
> lost to history...
>
> I'll read over his thesis once again, maybe I can find anything with regards
> to this.
>
> Either way, I've detailed from both the code and the thesis how the
> percentages are meant. In some cases, the % is calculated as //"% of the
> longer string's length"//. In the Leventhstein's case, it's actually inverted:
>
> ```
> Dist = (1 - Dist / LongerLength) * 100;
> ```
>
> So what this says is that if the current arg1-param1 arg2-param2 pairing has
> less than the inverse of 50% (which is more than 50%) of the longer string's
> edit distance, but the arg2-param1 and arg1-param2 (the suggested swapped
> order) has more than the inverse of 66% (which is less than 33%), then the
> swap will be suggested.
>
> Originally these values were called `LowerBound` and `UpperBound`,
> respectively, which was saying **even less** about what they mean...
Sadly, I think there isn't any scientific reason behind these numbers. They
just looked ok after a couple of test runs. (Maybe they make sense for shorter
arg names, like the 66 for 3 char long names.)
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D20689/new/
https://reviews.llvm.org/D20689
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