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Diffstat (limited to 'src/Text/Pandoc/Shared.hs')
| -rw-r--r-- | src/Text/Pandoc/Shared.hs | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/Text/Pandoc/Shared.hs b/src/Text/Pandoc/Shared.hs index 6854e5ae6..13eab9bdb 100644 --- a/src/Text/Pandoc/Shared.hs +++ b/src/Text/Pandoc/Shared.hs @@ -49,6 +49,7 @@ module Text.Pandoc.Shared ( wrapTeXIfNeeded, BlockWrapper (..), wrappedBlocksToDoc, + tabFilter, -- * Parsing (>>~), anyLine, @@ -285,6 +286,26 @@ wrappedBlocksToDoc = foldr addBlock empty addBlock (Pad d) accum = d $$ text "" $$ accum addBlock (Reg d) accum = d $$ accum +-- | Convert tabs to spaces and filter out DOS line endings. +-- Tabs will be preserved if tab stop is set to 0. +tabFilter :: Int -- ^ Tab stop + -> String -- ^ Input + -> String +tabFilter tabStop = + let go _ [] = "" + go _ ('\n':xs) = '\n' : go tabStop xs + go _ ('\r':'\n':xs) = '\n' : go tabStop xs + go _ ('\r':xs) = '\n' : go tabStop xs + go spsToNextStop ('\t':xs) = + if tabStop == 0 + then '\t' : go tabStop xs + else replicate spsToNextStop ' ' ++ go tabStop xs + go 1 (x:xs) = + x : go tabStop xs + go spsToNextStop (x:xs) = + x : go (spsToNextStop - 1) xs + in go tabStop + -- -- Parsing -- |