55 lines
1.2 KiB
Plaintext
Executable File
55 lines
1.2 KiB
Plaintext
Executable File
#!/usr/bin/env janet
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(use spork/test)
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(def peg
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'{:main
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(+ (<- :d)
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(/ "one" "1")
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(/ "two" "2")
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(/ "three" "3")
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(/ "four" "4")
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(/ "five" "5")
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(/ "six" "6")
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(/ "seven" "7")
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(/ "eight" "8")
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(/ "nine" "9"))})
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(defn match-digits [input]
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"Do a peg match character by character. Unfortunately couldn't figure out how to do overlap another way"
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(var arr @[])
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(loop [i :range [0 (length input)]]
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(let [match (first (peg/match peg input i))]
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(if match
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(array/push arr (first (peg/match peg input i))))))
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arr)
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(defn first+last [input]
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(let [m (match-digits input)]
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(scan-number
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(string/join [(first m) (last m)]))))
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(defn solve [lines]
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(sum (map first+last lines)))
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(start-suite)
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(assert (deep= @["1"] (match-digits "one")))
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(assert (deep= @["1" "2"] (match-digits "onetwo")))
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(assert (deep= @["1" "2" "3"] (match-digits "one2three")))
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(assert (deep= @["8" "3"] (match-digits "eighthree")))
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(def example
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["two1nine"
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"eighthree"
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"abcone2threexyz"
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"xtwone3four"
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"4nineightseven2"
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"onefour"
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"7pqrstsixteen"])
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(assert (= 281 (solve example)))
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(end-suite)
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(pp (with [f (file/open "p01.txt")] (solve (file/lines f))))
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