{-# LANGUAGE TemplateHaskell            #-}
{-# LANGUAGE DeriveGeneric              #-}
module Language.LSP.Types.Location where

import           Control.DeepSeq
import           Data.Aeson.TH
import           Data.Hashable
import           GHC.Generics hiding (UInt)
import           Language.LSP.Types.Common
import           Language.LSP.Types.Uri
import           Language.LSP.Types.Utils

-- ---------------------------------------------------------------------

-- | A position in a document. Note that the character offsets in a line
-- are given in UTF-16 code units, *not* Unicode code points.
data Position =
  Position
    { -- | Line position in a document (zero-based).
      Position -> UInt
_line      :: UInt
      -- | Character offset on a line in a document (zero-based). Assuming that
      -- the line is represented as a string, the @character@ value represents the
      -- gap between the @character@ and @character + 1@.
    , Position -> UInt
_character :: UInt
    } deriving (Int -> Position -> ShowS
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instance NFData Position
deriveJSON lspOptions ''Position

instance Hashable Position

-- ---------------------------------------------------------------------

data Range =
  Range
    { Range -> Position
_start :: Position -- ^ The range's start position.
    , Range -> Position
_end   :: Position -- ^ The range's end position.
    } deriving (Int -> Range -> ShowS
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deriveJSON lspOptions ''Range

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-- ---------------------------------------------------------------------

data Location =
  Location
    { Location -> Uri
_uri   :: Uri
    , Location -> Range
_range :: Range
    } deriving (Int -> Location -> ShowS
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instance NFData Location
deriveJSON lspOptions ''Location

instance Hashable Location

-- ---------------------------------------------------------------------

-- | Represents a link between a source and a target location.
data LocationLink =
  LocationLink
  { -- | Span of the origin of this link.
    -- Used as the underlined span for mouse interaction. Defaults to the word
    -- range at the mouse position.
    LocationLink -> Maybe Range
_originSelectionRange :: Maybe Range
    -- | The target resource identifier of this link.
  , LocationLink -> Uri
_targetUri :: Uri
    -- | The full target range of this link. If the target for example is a
    -- symbol then target range is the range enclosing this symbol not including
    -- leading/trailing whitespace but everything else like comments. This
    -- information is typically used to highlight the range in the editor.
  , LocationLink -> Range
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    -- | The range that should be selected and revealed when this link is being
    -- followed, e.g the name of a function. Must be contained by the the
    -- 'targetRange'. See also @DocumentSymbol._range@
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-- ---------------------------------------------------------------------

-- | A helper function for creating ranges.
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