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Handle nil end position in getMappedLocation #1920

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Merged
merged 5 commits into from
Oct 22, 2025
Merged

Handle nil end position in getMappedLocation #1920

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17a4f9e
Handle nil end position in getMappedLocation
jakebailey Oct 22, 2025
6ffa90f
bitten by the local baselines again
jakebailey Oct 22, 2025
8103882
Revert unrelated changes
jakebailey Oct 22, 2025
eb68a0b
Remove baseline
jakebailey Oct 22, 2025
b760558
clamp position in PositionToLineAndCharacter maybe
jakebailey Oct 22, 2025
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2 changes: 2 additions & 0 deletions internal/ls/converters.go
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Original file line number Diff line number Diff line change
Expand Up @@ -166,6 +166,8 @@ func (c *Converters) LineAndCharacterToPosition(script Script, lineAndCharacter
func (c *Converters) PositionToLineAndCharacter(script Script, position core.TextPos) lsproto.Position {
// UTF-8 offset to UTF-8/16 0-indexed line and character

position = min(position, core.TextPos(len(script.Text())))

lineMap := c.getLineMap(script.FileName())

line, isLineStart := slices.BinarySearch(lineMap.LineStarts, position)
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6 changes: 6 additions & 0 deletions internal/ls/source_map.go
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Expand Up @@ -18,6 +18,12 @@ func (l *LanguageService) getMappedLocation(fileName string, fileRange core.Text
}
}
endPos := l.tryGetSourcePosition(fileName, core.TextPos(fileRange.End()))
if endPos == nil {
endPos = &sourcemap.DocumentPosition{
FileName: startPos.FileName,
Pos: startPos.Pos + fileRange.Len(),
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@andrewbranch andrewbranch Oct 22, 2025

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Looks right as a port, but since this is happening, do we need to ensure this position is inside the length of the file?

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@jakebailey jakebailey Oct 22, 2025

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I'm not sure; my understanding is that the conversion to an LSP range will clamp it via the line map, but maybe not... I can grab the script and min the text length.

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@andrewbranch andrewbranch Oct 22, 2025

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It looks like PositionToLineAndCharacter will crash with a slice range out of bounds when rescanning the line for the UTF-16 character offset. Maybe it’s worth adding a guard there and not worrying about it here.

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@jakebailey jakebailey Oct 22, 2025

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Hm, I can. I'm questioning whether or not it's a good idea, though, given we don't do the same sort of bounds checks when going from an LSP position to a byte position... Could go either way. Either way it's sort of papering over something.

}
}
debug.Assert(endPos.FileName == startPos.FileName, "start and end should be in same file")
newRange := core.NewTextRange(startPos.Pos, endPos.Pos)
lspRange := l.createLspRangeFromRange(newRange, l.getScript(startPos.FileName))
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