NightOwl888 commented on code in PR #654:
URL: https://github.com/apache/lucenenet/pull/654#discussion_r995587910
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src/Lucene.Net.Analysis.Common/Analysis/Fr/FrenchStemmer.cs:
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@@ -483,21 +483,21 @@ private void DeleteButSuffixFromElseReplace(string
source, string[] search, stri
{
if (source.EndsWith(prefix + search[i],
StringComparison.Ordinal))
{
- sb.Remove(sb.Length - (prefix.Length +
search[i].Length), sb.Length - sb.Length - (prefix.Length + search[i].Length));
+ sb.Remove(sb.Length - (prefix.Length +
search[i].Length), sb.Length);
Review Comment:
The reason why this differs is because in Java the parameters are
`startIndex` and `endIndex`, but in .NET we have `startIndex` and `length`.
https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html#delete-int-int-
https://learn.microsoft.com/en-us/dotnet/api/system.text.stringbuilder.remove?view=net-7.0
Therefore, we need to do some light math to correct this:
```
length = endIndex - startIndex
```
This correction is common across many method conversions from Java to .NET.
That being said, we are missing a set of parentheses here and in the other
methods in this class to force the order of precedence, which is a very subtle
bug:
```c#
sb.Remove(sb.Length - (prefix.Length + search[i].Length), sb.Length -
(sb.Length - (prefix.Length + search[i].Length)));
```
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