From: Neil Smith <neil.git@njae.me.uk>
Date: Wed, 12 Dec 2018 08:28:12 +0000 (+0000)
Subject: Better parser, better display
X-Git-Url: https://git.njae.me.uk/?a=commitdiff_plain;h=b5225f8527d35a85382e8ab4e9a47646d8b8a2fd;p=advent-of-code-18.git

Better parser, better display
---

diff --git a/src/advent10/advent10-iterate-zip.hs b/src/advent10/advent10-iterate-zip.hs
index ea26113..3d3811b 100644
--- a/src/advent10/advent10-iterate-zip.hs
+++ b/src/advent10/advent10-iterate-zip.hs
@@ -17,8 +17,8 @@ import qualified Data.Set as S
 type Coord = (Integer, Integer) -- x, y
 type Bounds = (Integer, Integer, Integer, Integer) -- minX, maxX, minY, maxY
 data Particle = Particle {_position :: Coord, _velocity :: Coord} deriving (Eq, Show)
-type Swarm = [Particle]
-type Grid = S.Set Coord
+type Grid = [Particle]
+type Matrix = S.Set Coord
 
 main :: IO ()
 main = do 
@@ -28,14 +28,14 @@ main = do
         putStrLn $ showParticles final
         print time
 
-part0 :: Swarm -> (Swarm, Int)
+part0 :: Grid -> (Grid, Int)
 part0 particles = (snd $ last $ gridPairs, length gridPairs)
     where gridPairs = findEnd particles
 
-runParticles :: Swarm -> [Swarm]
+runParticles :: Grid -> [Grid]
 runParticles = iterate updateAll 
 
-findEnd :: Swarm -> [(Swarm, Swarm)]
+findEnd :: Grid -> [(Grid, Grid)]
 findEnd particles = takeWhile firstLarger gridPairs
     where grids = runParticles particles
           gridPairs = zip grids (drop 1 grids)
@@ -43,11 +43,11 @@ findEnd particles = takeWhile firstLarger gridPairs
 
 
 
-boundsArea :: Swarm -> Integer
+boundsArea :: Grid -> Integer
 boundsArea particles = (maxX - minX) * (maxY - minY)
     where (minX, maxX, minY, maxY) = findBounds particles
 
-findBounds :: Swarm -> Bounds 
+findBounds :: Grid -> Bounds 
 findBounds particles = 
         ( minX -- small x edge
         , maxX -- large x edge
@@ -66,21 +66,21 @@ update particle = particle {_position = (x + vx, y + vy)}
           (vx, vy) = _velocity particle
 
 
-updateAll :: Swarm -> Swarm
+updateAll :: Grid -> Grid
 updateAll = map update
 
-showParticles :: Swarm -> String
+showParticles :: Grid -> String
 showParticles particles = intercalate "\n" rows
     where (minX, maxX, minY, maxY) = findBounds particles
-          grid = S.fromList $ map _position particles
-          rows = [showRow y minX maxX grid | y <- [minY..maxY] ]
+          swarm = S.fromList $ map _position particles
+          rows = [showRow y minX maxX swarm | y <- [minY..maxY] ]
 
-showCell :: Integer -> Integer -> Grid -> Char
+showCell :: Integer -> Integer -> Matrix -> Char
 showCell x y grid 
-    | (x, y) `S.member` grid = '*'
-    | otherwise = ' '
+    | (x, y) `S.member` grid = '\x2593'
+    | otherwise = '\x2591'
 
-showRow :: Integer -> Integer -> Integer -> Grid -> String
+showRow :: Integer -> Integer -> Integer -> Matrix -> String
 showRow y minX maxX grid = [showCell x y grid | x <- [minX..maxX] ]
 
 -- Parse the input file
@@ -105,12 +105,12 @@ particleFileP = many particleP
 particleP = particlify <$> positionP <*> velocityP 
     where particlify x v = Particle x v
 
-positionP = posPrefix *> pairP <* suffix
-velocityP = velPrefix *> pairP <* suffix
+positionP = between posPrefix suffix pairP 
+velocityP = between velPrefix suffix pairP
 
 pairP = (,) <$> signedInteger <* commaP <*> signedInteger
 
-successfulParse :: Text -> Swarm
+successfulParse :: Text -> Grid
 successfulParse input = 
         case parse particleFileP "input" input of
                 Left  _error -> [] -- TIO.putStr $ T.pack $ parseErrorPretty err
diff --git a/src/advent10/advent10.hs b/src/advent10/advent10.hs
index 59d7c47..19b1f70 100644
--- a/src/advent10/advent10.hs
+++ b/src/advent10/advent10.hs
@@ -12,7 +12,6 @@ import Text.Megaparsec.Char
 import qualified Text.Megaparsec.Char.Lexer as L
 import qualified Control.Applicative as CA
 
-import qualified Data.Map.Strict as M
 import qualified Data.Set as S
 
 type Coord = (Integer, Integer) -- x, y
@@ -30,13 +29,14 @@ main = do
         print time
 
 
-part1 particles 
-    | area' > area = showParticles particles
-    | otherwise = part1 particles'
-    where particles' = updateAll particles
-          area = boundsArea particles
-          area' = boundsArea particles'
+-- part1 particles 
+--     | area' > area = showParticles particles
+--     | otherwise = part1 particles'
+--     where particles' = updateAll particles
+--           area = boundsArea particles
+--           area' = boundsArea particles'
 
+part2 :: Integer -> [Particle] -> (Integer, String)
 part2 time particles 
     | area' > area = (time, showParticles particles)
     | otherwise = part2 (time+1) particles'
@@ -78,8 +78,8 @@ showParticles particles = intercalate "\n" rows
 
 showCell :: Integer -> Integer -> Grid -> Char
 showCell x y grid 
-    | (x, y) `S.member` grid = '*'
-    | otherwise = ' '
+    | (x, y) `S.member` grid = '\x2593'
+    | otherwise = '\x2591'
 
 showRow :: Integer -> Integer -> Integer -> Grid -> String
 showRow y minX maxX grid = [showCell x y grid | x <- [minX..maxX] ]
@@ -106,8 +106,8 @@ particleFileP = many particleP
 particleP = particlify <$> positionP <*> velocityP 
     where particlify x v = Particle x v
 
-positionP = posPrefix *> pairP <* suffix
-velocityP = velPrefix *> pairP <* suffix
+positionP = between posPrefix suffix pairP 
+velocityP = between velPrefix suffix pairP
 
 pairP = (,) <$> signedInteger <* commaP <*> signedInteger