Done day 18

diff --git a/advent18/package.yaml b/advent18/package.yaml
new file mode 100644 (file)
index 0000000..ce75243
--- /dev/null
+++ b/advent18/package.yaml
@@ -0,0 +1,60 @@
+# This YAML file describes your package. Stack will automatically generate a
+# Cabal file when you run `stack build`. See the hpack website for help with
+# this file: <https://github.com/sol/hpack>.
+
+name: advent18
+synopsis: Advent of Code
+version: '0.0.1'
+
+default-extensions:
+- AllowAmbiguousTypes
+- ApplicativeDo
+- BangPatterns
+- BlockArguments
+- DataKinds
+- DeriveFoldable
+- DeriveFunctor
+- DeriveGeneric
+- DeriveTraversable
+- EmptyCase
+- FlexibleContexts
+- FlexibleInstances
+- FunctionalDependencies
+- GADTs
+- GeneralizedNewtypeDeriving
+- ImplicitParams
+- KindSignatures
+- LambdaCase
+- MonadComprehensions
+- MonoLocalBinds
+- MultiParamTypeClasses
+- MultiWayIf
+- NamedFieldPuns
+- NegativeLiterals
+- NumDecimals
+# - OverloadedLists
+- OverloadedStrings
+- PartialTypeSignatures
+- PatternGuards
+- PatternSynonyms
+- PolyKinds
+- RankNTypes
+- RecordWildCards
+- ScopedTypeVariables
+- TemplateHaskell
+- TransformListComp
+- TupleSections
+- TypeApplications
+- TypeFamilies
+- TypeInType
+- TypeOperators
+- ViewPatterns
+
+executables:
+  advent18:
+    main: advent18.hs
+    source-dirs: src
+    dependencies:
+    - base >= 2 && < 6
+    - text
+    - attoparsec

diff --git a/advent18/src/advent18.hs b/advent18/src/advent18.hs
new file mode 100644 (file)
index 0000000..1ee07f5
--- /dev/null
+++ b/advent18/src/advent18.hs
@@ -0,0 +1,92 @@
+-- import Debug.Trace
+
+import Data.Text (Text)
+-- import qualified Data.Text as T
+import qualified Data.Text.IO as TIO
+
+import Data.Attoparsec.Text hiding (take)
+-- import Data.Attoparsec.Combinator
+import Control.Applicative
+-- import Control.Applicative.Combinators
+
+data Expression 
+  = Number Integer
+  | Mul Expression Expression
+  | Add Expression Expression
+  deriving (Show, Eq)
+
+
+main :: IO ()
+main = 
+  do  text <- TIO.readFile "data/advent18.txt"
+      print $ part1 text
+      print $ part2 text
+
+
+part1 = parseAndEval expressionsP
+part2 = parseAndEval pExpressionsP
+
+parseAndEval parser text = sumEval $ successfulParse parser text
+
+sumEval = sum . map evaluate
+
+showE (Number x) = show x
+showE (Mul a b) = "(" ++ showE a ++ " * " ++ showE b ++ ")"
+showE (Add a b) = "(" ++ showE a ++ " + " ++ showE b ++ ")"
+
+evaluate (Number x)  = x
+evaluate (Mul a b) = (evaluate a) * (evaluate b)
+evaluate (Add a b) = (evaluate a) + (evaluate b)
+
+
+-- Parse the input file
+
+numberP = Number <$> decimal
+mulExprP = string " * " *> pure Mul
+addExprP = string " + " *> pure Add
+
+
+-- Part 1 parsing
+
+expressionsP = exprP `sepBy` endOfLine
+
+exprP = elementP `chainl1` (mulExprP <|> addExprP)
+
+elementP = numberP <|> bracketedP
+bracketedP = "(" *> exprP <* ")"
+
+
+-- Part 2 parsing
+
+pExpressionsP = pExprP `sepBy` endOfLine
+
+pExprP = pTermP `chainl1` mulExprP
+pTermP = pElementP `chainl1` addExprP
+
+pElementP = numberP <|> pBracketedP
+pBracketedP = "(" *> pExprP <* ")"
+
+
+-- chainl1 :: Parser a -> Parser (a -> a -> a) -> Parser a
+-- chainl1 p op = p >>= rest
+--     where 
+--         rest a = (do
+--             f <- op
+--             b <- p
+--             rest (f a b)) <|> pure a
+
+
+chainl1 :: Parser a -> Parser (a -> a -> a) -> Parser a
+p `chainl1` op = do a <- p
+                    rest a
+  where rest a = (do f <- op
+                     b <- p
+                     rest (f a b))
+                 <|> return a
+
+
+-- successfulParse :: Text -> (Integer, [Maybe Integer])
+successfulParse parser input = 
+  case parseOnly parser input of
+    Left  _err -> [] -- TIO.putStr $ T.pack $ parseErrorPretty err
+    Right expressions -> expressions

diff --git a/data/advent18.txt b/data/advent18.txt
new file mode 100644 (file)
index 0000000..de58882
--- /dev/null
+++ b/data/advent18.txt
@@ -0,0 +1,376 @@
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\ No newline at end of file

diff --git a/stack.yaml b/stack.yaml
index d9fee510c11ce7c12f70d92bd15fddfc568c943e..ba78e950745e2b5d1243763ba46d7be62394d440 100644 (file)
--- a/stack.yaml
+++ b/stack.yaml
@@ -52,6 +52,7 @@ packages:
 - advent15
 - advent16
 - advent17
+- advent18
 
 # Dependency packages to be pulled from upstream that are not in the resolver.
 # These entries can reference officially published versions as well as