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module Language.Elna.Location
( Identifier(..)
, Location(..)
, Node(..)
, showArrayType
) where
import Data.Hashable (Hashable(..))
import Data.String (IsString(..))
import Data.Text (Text)
import qualified Data.Text as Text
import Data.Word (Word32)
data Location = Location
{ line :: Word32
, column :: Word32
} deriving (Eq, Show)
instance Semigroup Location
where
(Location thisLine thisColumn) <> (Location thatLine thatColumn) = Location
{ line = thisLine + thatLine
, column = thisColumn + thatColumn
}
instance Monoid Location
where
mempty = Location{ line = 1, column = 1 }
data Node a = Node a Location
deriving (Eq, Show)
instance Functor Node
where
fmap f (Node node location) = Node (f node) location
newtype Identifier = Identifier { unIdentifier :: Text }
deriving Eq
instance Show Identifier
where
show (Identifier identifier) = Text.unpack identifier
instance IsString Identifier
where
fromString = Identifier . Text.pack
instance Ord Identifier
where
compare (Identifier lhs) (Identifier rhs) = compare lhs rhs
instance Hashable Identifier
where
hashWithSalt salt (Identifier identifier) = hashWithSalt salt identifier
showArrayType :: (Show a, Show b) => a -> b -> String
showArrayType elementCount typeName = concat
["array[", show elementCount, "] of ", show typeName]
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