Day 01

day01/Commons.hs

@@ -0,0 +1,20 @@
+module Commons where
+
+import System.IO
+import Text.Read
+
+type CalibrationLine = String
+
+type CalibrationDocument = [CalibrationLine]
+
+parseLine :: IO CalibrationLine
+parseLine = do line <- getLine
+               return line
+
+parse :: IO CalibrationDocument
+parse = do done <- isEOF
+           if done
+              then return []
+              else do line <- parseLine
+                      doc <- parse
+                      return (line:doc)

day01/Main.hs

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+module Main where
+
+import Commons
+import Part1
+import Part2
+
+main = do doc <- parse
+          let part1Res = sum (Part1.getCalibrationValues doc)
+          putStrLn (show (part1Res))
+          let part2Res = sum (Part2.getCalibrationValues doc)
+          putStrLn (show (part2Res))

day01/Part1.hs

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+module Part1 where
+
+import Commons
+
+getCalibrationValuePart :: CalibrationLine -> Char
+getCalibrationValuePart (h: _) | h >= '0' && h <= '9' = h
+getCalibrationValuePart (_: t) = getCalibrationValuePart t
+
+getCalibrationValue :: CalibrationLine -> Integer
+getCalibrationValue line = read [(getCalibrationValuePart line), (getCalibrationValuePart (reverse line))]
+
+getCalibrationValues :: CalibrationDocument -> [Integer]
+getCalibrationValues (h: []) = [(getCalibrationValue h)]
+getCalibrationValues (h: t) = ((getCalibrationValue h): (getCalibrationValues t))

day01/Part2.hs

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+module Part2 where
+
+import Commons
+
+getCalibrationValueLeft :: CalibrationLine -> Char
+getCalibrationValueLeft ('o': 'n': 'e': _) = '1'
+getCalibrationValueLeft ('t': 'w': 'o': _) = '2'
+getCalibrationValueLeft ('t': 'h': 'r': 'e': 'e': _) = '3'
+getCalibrationValueLeft ('f': 'o': 'u': 'r': _) = '4'
+getCalibrationValueLeft ('f': 'i': 'v': 'e': _) = '5'
+getCalibrationValueLeft ('s': 'i': 'x': _) = '6'
+getCalibrationValueLeft ('s': 'e': 'v': 'e': 'n': _) = '7'
+getCalibrationValueLeft ('e': 'i': 'g': 'h': 't': _) = '8'
+getCalibrationValueLeft ('n': 'i': 'n': 'e': _) = '9'
+getCalibrationValueLeft (h: _) | h >= '0' && h <= '9' = h
+getCalibrationValueLeft (_: t) = getCalibrationValueLeft t
+
+getCalibrationValueRight :: CalibrationLine -> Char
+getCalibrationValueRight ('e': 'n': 'o': _) = '1'
+getCalibrationValueRight ('o': 'w': 't': _) = '2'
+getCalibrationValueRight ('e': 'e': 'r': 'h': 't': _) = '3'
+getCalibrationValueRight ('r': 'u': 'o': 'f': _) = '4'
+getCalibrationValueRight ('e': 'v': 'i': 'f': _) = '5'
+getCalibrationValueRight ('x': 'i': 's': _) = '6'
+getCalibrationValueRight ('n': 'e': 'v': 'e': 's': _) = '7'
+getCalibrationValueRight ('t': 'h': 'g': 'i': 'e': _) = '8'
+getCalibrationValueRight ('e': 'n': 'i': 'n': _) = '9'
+getCalibrationValueRight (h: _) | h >= '0' && h <= '9' = h
+getCalibrationValueRight (_: t) = getCalibrationValueRight t
+
+getCalibrationValue :: CalibrationLine -> Integer
+getCalibrationValue line = read [(getCalibrationValueLeft line), (getCalibrationValueRight (reverse line))]
+
+getCalibrationValues :: CalibrationDocument -> [Integer]
+getCalibrationValues (h: []) = [(getCalibrationValue h)]
+getCalibrationValues (h: t) = ((getCalibrationValue h): (getCalibrationValues t))