Fix off-by-one error in validation within GetOffsetAtPosition
#1669
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The incoming line number is 1-indexed (not 0-indexed), so while the lower limit was correctly set to 1, the upper limit was set to `FileLines.Count` which could be 0, but 0 lines implies an upper limit of 1 with this indexing. See `ScriptFile.GetLine` for the only other use of this 1-index range validation.
ghost
added
| @@ -411,7 +411,7 @@ public void ApplyChange(FileChange fileChange) | |||
| /// <returns>The zero-based offset for the given file position.</returns> | |||
| public int GetOffsetAtPosition(int lineNumber, int columnNumber) | |||
| { | |||
| Validate.IsWithinRange("lineNumber", lineNumber, 1, this.FileLines.Count); | |||
| Validate.IsWithinRange("lineNumber", lineNumber, 1, this.FileLines.Count + 1); | |||
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Maybe this should just be a separate check for FileLines.Count == 0? I feel like the check is correct here, it just doesn't account for empty? Maybe it should be Math.Max(this.FileLines.Count, 1)?
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The use of IsWithinRange does not work well with 1-indexed lists that could be empty. I agree this looks weird, but it's what's done here too:
|
@SeeminglyScience I'm going to merge this for now so that the user reported issue can be tested. We can revert if needed. |
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The incoming line number is 1-indexed (not 0-indexed), so while the
lower limit was correctly set to 1, the upper limit was set to
FileLines.Countwhich could be 0, but 0 lines implies an upper limitof 1 with this indexing. See
ScriptFile.GetLinefor the only other useof this 1-index range validation.
Fixes #1663.