Updated README to fix a typo and add some clarificaiton about directories

[advent-of-code-16.git] / adventofcode16 / app / advent23.hs

diff --git a/adventofcode16/app/advent23.hs b/adventofcode16/app/advent23.hs
index 20c4a15154df24f540eb67119acb9cd1b4c6e51c..2903967e8b37f64624dd7cc3eea301717050bc0d 100644 (file)
--- a/adventofcode16/app/advent23.hs
+++ b/adventofcode16/app/advent23.hs
@@ -21,7 +21,6 @@ data Machine = Machine { a :: Int
                        , instructions :: [Instruction]} 
                deriving (Show, Eq)
 
-
 testInstructions = "cpy 2 a\n\
 \tgl a\n\
 \tgl a\n\
@@ -30,7 +29,6 @@ testInstructions = "cpy 2 a\n\
 \dec a\n\
 \dec a"
 
-
 emptyMachine :: Machine
 emptyMachine = Machine {a=0, b=0, c=0, d=0, pc=0, instructions=[]}
 
@@ -162,15 +160,14 @@ writeValue m (Register r) v =
 instructionFile = instructionLine `sepEndBy` newline 
 instructionLine = incL <|> decL <|> cpyL <|> jnzL <|> tglL
 
-incL = (Inc . Register) <$> (string "inc" *> spaces *> (oneOf "abcd"))
-decL = (Dec . Register) <$> (string "dec" *> spaces *> (oneOf "abcd"))
-cpyL = cpyify <$> (string "cpy" *> spaces *> ((Literal <$> int) <|> ((Register . head) <$> (many1 letter))))
-              <*> (spaces *> (oneOf "abcd"))
-        where cpyify s r = Cpy s (Register r)
-jnzL = jnzify <$> (string "jnz" *> spaces *> ((Literal <$> int) <|> ((Register . head) <$> (many1 letter))))
-              <*> (spaces *> ((Literal <$> int) <|> ((Register . head) <$> (many1 letter))))
-        where jnzify r o = Jnz r o
-tglL = Tgl <$> (string "tgl" *> spaces *> ((Literal <$> int) <|> ((Register . head) <$> (many1 letter)))) 
+incL = Inc <$> (string "inc" *> spaces *> register)
+decL = Dec <$> (string "dec" *> spaces *> register)
+cpyL = Cpy <$> (string "cpy" *> spaces *> location) <*> (spaces *> register)
+jnzL = Jnz <$> (string "jnz" *> spaces *> location) <*> (spaces *> location)
+tglL = Tgl <$> (string "tgl" *> spaces *> location)
+
+location = (Literal <$> int) <|> register
+register = Register <$> (oneOf "abcd")
 
 parseIfile :: String -> Either ParseError [Instruction]
 parseIfile input = parse instructionFile "(unknown)" input
@@ -180,4 +177,4 @@ parseIline input = parse instructionLine "(unknown)" input
 
 successfulParse :: Either ParseError [a] -> [a]
 successfulParse (Left _) = []
-successfulParse (Right a) = a
\ No newline at end of file
+successfulParse (Right a) = a