src/Development/IDE/Types/Location.hs · ghcide

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ghcide/src/Development/IDE/Types/Location.hs

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2-- SPDX-License-Identifier: Apache-2.0

4{-# LANGUAGE OverloadedStrings #-}

6-- | Types and functions for working with source code locations.

7module Development.IDE.Types.Location

8 ( Location(..)

9 , noFilePath

10 , noRange

11 , Position(..)

12 , Range(..)

13 , Uri(..)

14 , NormalizedUri

15 , LSP.toNormalizedUri

16 , LSP.fromNormalizedUri

17 , NormalizedFilePath

18 , fromUri

19 , toNormalizedFilePath

20 , fromNormalizedFilePath

21 , filePathToUri

22 , filePathToUri'

23 , uriToFilePath'

24 ) where

26import Language.Haskell.LSP.Types (Location(..), Range(..), Position(..))

29import Control.DeepSeq

30import Data.Maybe as Maybe

31import Data.Hashable

32import Data.String

33import System.FilePath

34import qualified Language.Haskell.LSP.Types as LSP

35import Language.Haskell.LSP.Types as LSP (

36 filePathToUri

37 , NormalizedUri(..)

38 , Uri(..)

39 , toNormalizedUri

40 , fromNormalizedUri

41 )

44-- | Newtype wrapper around FilePath that always has normalized slashes.

45newtype NormalizedFilePath = NormalizedFilePath FilePath

46 deriving (Eq, Ord, Show, Hashable, NFData)

48instance IsString NormalizedFilePath where

49 fromString = toNormalizedFilePath

51toNormalizedFilePath :: FilePath -> NormalizedFilePath

52toNormalizedFilePath "" = NormalizedFilePath ""

53toNormalizedFilePath fp = NormalizedFilePath $ normalise' fp

54 where

55 -- We do not use System.FilePath’s normalise here since that

56 -- also normalises things like the case of the drive letter

57 -- which NormalizedUri does not normalise so we get VFS lookup failures.

58 normalise' :: FilePath -> FilePath

59 normalise' = map (\c -> if isPathSeparator c then pathSeparator else c)

61fromNormalizedFilePath :: NormalizedFilePath -> FilePath

62fromNormalizedFilePath (NormalizedFilePath fp) = fp

64-- | We use an empty string as a filepath when we don’t have a file.

65-- However, haskell-lsp doesn’t support that in uriToFilePath and given

66-- that it is not a valid filepath it does not make sense to upstream a fix.

67-- So we have our own wrapper here that supports empty filepaths.

68uriToFilePath' :: Uri -> Maybe FilePath

69uriToFilePath' uri

70 | uri == filePathToUri "" = Just ""

71 | otherwise = LSP.uriToFilePath uri

73filePathToUri' :: NormalizedFilePath -> NormalizedUri

74filePathToUri' = toNormalizedUri . filePathToUri . fromNormalizedFilePath

77fromUri :: LSP.NormalizedUri -> NormalizedFilePath

78fromUri = toNormalizedFilePath . fromMaybe noFilePath . uriToFilePath' . fromNormalizedUri

81noFilePath :: FilePath

82noFilePath = "<unknown>"

84-- A dummy range to use when range is unknown

85noRange :: Range

86noRange = Range (Position 0 0) (Position 100000 0)