I used NimbleParsec to build a parser:
defmodule Parser do
import NimbleParsec
disable =
ignore(string("don't()"))
|> tag(:disable)
enable =
ignore(string("do()"))
|> tag(:enable)
operand = integer(max: 3, min: 1)
mul =
ignore(string("mul("))
|> concat(operand)
|> ignore(string(","))
|> concat(operand)
|> ignore(string(")"))
|> tag(:mul)
instruction = choice([disable, enable, mul])
instructions =
eventually(instruction)
|> repeat()
defparsec(:parse, instructions |> eventually(eos()))
end
https://github.com/jswanner/aoc/blob/main/2024/day-03.livemd
<3
