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For many and fold, consider ..0 an invalid range, just as 0..0 is #1632

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@cky cky commented Jan 31, 2023

nom::multi::many and nom::many::fold consider empty ranges, as checked by NomRange::is_inverted, to be invalid. Unfortunately, that method is incorrectly implemented for RangeTo, meaning that ..0 is not considered invalid when it should be.

While I'm here, I also fixed up off-by-one errors in RangeFrom::bounded_iter and RangeFull::bounded_iter.

@cky cky requested a review from Geal as a code owner January 31, 2023 02:45
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Pull Request Test Coverage Report for Build 4050233552

  • 6 of 9 (66.67%) changed or added relevant lines in 1 file are covered.
  • 1 unchanged line in 1 file lost coverage.
  • Overall coverage increased (+0.3%) to 62.55%

Changes Missing Coverage Covered Lines Changed/Added Lines %
src/traits.rs 6 9 66.67%
Files with Coverage Reduction New Missed Lines %
src/character/streaming.rs 1 78.38%
Totals Coverage Status
Change from base Build 3981619336: 0.3%
Covered Lines: 1560
Relevant Lines: 2494

💛 - Coveralls

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Thanks for catching these. It has been a long while since I last touched this piece of the code but the off-by-one fixes seem correct to me. I'm just not sure about removing the explicit self.end == 0 checks. Those still seem necessary to me.

if self.end == 0 {
1..0
} else {
0..self.end - 1
}
0..self.end - 1
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Wouldn't this panic when overflow checking is enabled (such as when building with debug)?
And even if the underflow does not panic it would return 0..usize::MAX as the iterator for a range of x..0. This is incorrect because the range should be empty. Similar reasoning applies to the other range implementations.

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3 participants