Day 18

Yay parsec

2 files changed, 416 insertions, 0 deletions

diff --git a/2020/18.hs b/2020/18.hs
new file mode 100644
index 0000000..e77ea48
--- /dev/null
+++ b/2020/18.hs
@@ -0,0 +1,39 @@
+module Main where
+
+import Text.Parsec hiding (getInput)
+import Text.Parsec.Expr
+
+import Input
+
+
+data Expr = Expr :+ Expr | Expr :* Expr | Lit Int
+  deriving (Show)
+
+eval :: Expr -> Int
+eval (a :+ b) = eval a + eval b
+eval (a :* b) = eval a * eval b
+eval (Lit n) = n
+
+type Parser = Parsec String ()
+
+data Part = Part1 | Part2
+
+parseExpr :: Part -> String -> Expr
+parseExpr part = either (error . show) id . parse pExpr ""
+  where
+    pExpr = buildExpressionParser (table part) pTerm
+    table Part1 = [[Infix (pOpers [pOperPlus, pOperMul]) AssocLeft]]
+    table Part2 = [[Infix (pOpers [pOperPlus]) AssocLeft]
+                  ,[Infix (pOpers [pOperMul]) AssocLeft]]
+    pTerm = try (spaces >> ((Lit <$> pNum) <|> pParens))
+    pNum = read <$> many1 digit
+    pParens = between (char '(') (char ')') pExpr
+    pOpers os = try (spaces >> choice os) :: Parser (Expr -> Expr -> Expr)
+    pOperPlus = (:+) <$ char '+'
+    pOperMul = (:*) <$ char '*'
+
+main :: IO ()
+main = do
+    input <- getInput 18
+    print (sum (map (eval . parseExpr Part1) input))
+    print (sum (map (eval . parseExpr Part2) input))
diff --git a/2020/18.in b/2020/18.in
new file mode 100644
index 0000000..4fd2cf6
--- /dev/null
+++ b/2020/18.in
@@ -0,0 +1,377 @@
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