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Share the computation of the first line.

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This commit is contained in:
Rob Rix 2017-05-19 11:45:51 -04:00
parent 406001f25f
commit 13b6445309
1 changed files with 3 additions and 2 deletions
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src/Source.hs
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@ -121,8 +121,9 @@ sourceSpanToRange source SourceSpan{..} = Range start end
-- | Compute the 'SourceSpan' corresponding to a given byte 'Range' in a 'Source'. -- | Compute the 'SourceSpan' corresponding to a given byte 'Range' in a 'Source'.
rangeToSourceSpan :: Source -> Range -> SourceSpan rangeToSourceSpan :: Source -> Range -> SourceSpan
rangeToSourceSpan source (Range rangeStart rangeEnd) = SourceSpan startPos endPos rangeToSourceSpan source (Range rangeStart rangeEnd) = SourceSpan startPos endPos
where startPos = SourcePos (Prologue.length before + 1) (rangeStart - start firstRange + 1) where startPos = SourcePos (firstLine + 1) (rangeStart - start firstRange + 1)
endPos = SourcePos (Prologue.length before + Prologue.length lineRanges) (rangeEnd - start lastRange + 1) endPos = SourcePos (firstLine + Prologue.length lineRanges) (rangeEnd - start lastRange + 1)
firstLine = Prologue.length before
(before, rest) = span ((< rangeStart) . end) (actualLineRanges source) (before, rest) = span ((< rangeStart) . end) (actualLineRanges source)
(lineRanges, _) = span ((<= rangeEnd) . start) rest (lineRanges, _) = span ((<= rangeEnd) . start) rest
Just firstRange = getFirst (foldMap (First . Just) lineRanges) Just firstRange = getFirst (foldMap (First . Just) lineRanges)