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PARSER: use 'Either' from Prelude instead of custom QuadOrOrient

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hasufell
2014-11-14 22:58:21 +01:00
parent 068ea04d56
commit d5741d3839
2 changed files with 19 additions and 26 deletions
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29
Parser/PathParser.hs
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@@ -7,16 +7,9 @@ import Parser.Core
import Algorithms.RangeSearch.Core (Quad(NW, NE, SW, SE), Orient(North, South, West, East))
-- |Can either be an Orientation or a Quad, corresponding to the
-- Algorithms.RangeSearch module.
data QuadOrOrient = Orient Orient
| Quad Quad
deriving (Show)
-- |Parse a string such as "ne, n, sw, e" into
-- [Quad NE, Orient North, Quad SW, Orient East].
stringToQuads :: String -> [QuadOrOrient]
stringToQuads :: String -> [Either Quad Orient]
stringToQuads str = case runParser parsePath str of
Nothing -> []
Just xs -> fst xs
@@ -28,19 +21,19 @@ stringToQuads str = case runParser parsePath str of
-- |Parses a string that represents a single squad into the
-- QuadOrOrient ADT.
parseQuad :: Parser QuadOrOrient
parseQuad :: Parser (Either Quad Orient)
parseQuad =
const (Quad NW) <$> (string "nw" <|> string "NW")
<|> const (Quad NE) <$> (string "ne" <|> string "NE")
<|> const (Quad SW) <$> (string "sw" <|> string "SW")
<|> const (Quad SE) <$> (string "se" <|> string "SE")
const (Left NW) <$> (string "nw" <|> string "NW")
<|> const (Left NE) <$> (string "ne" <|> string "NE")
<|> const (Left SW) <$> (string "sw" <|> string "SW")
<|> const (Left SE) <$> (string "se" <|> string "SE")
-- |Parses a string that represents a single Orientation into the
-- QuadOrOrient ADT.
parseOrient :: Parser QuadOrOrient
parseOrient :: Parser (Either Quad Orient)
parseOrient =
const (Orient North) <$> (string "n" <|> string "N")
<|> const (Orient South) <$> (string "s" <|> string "S")
<|> const (Orient West) <$> (string "w" <|> string "W")
<|> const (Orient East) <$> (string "e" <|> string "E")
const (Right North) <$> (string "n" <|> string "N")
<|> const (Right South) <$> (string "s" <|> string "S")
<|> const (Right West) <$> (string "w" <|> string "W")
<|> const (Right East) <$> (string "e" <|> string "E")