Advent Day 2

day2.jl

import Base.strip

function do_stuff(input)
    tokens = strip(split(input, "\n"))
    get_code(tokens)
    println()
    get_code_weird(tokens)
end

function get_code(tokens)
    coordinates = [2, 2]
    numpad = [1 2 3; 4 5 6; 7 8 9]

    for token in tokens
        for char in token
            if char == 'U'
                coordinates[2] = max(coordinates[2] - 1, 1)
            elseif char == 'R'
                coordinates[1] = min(coordinates[1] + 1, 3)
            elseif char == 'D'
                coordinates[2] = min(coordinates[2] + 1, 3)
            elseif char == 'L'
                coordinates[1] = max(coordinates[1] - 1, 1)
            else
                error( string("Bad Char ", char))
            end
        end
        # coordinates
        print(numpad[coordinates[2], coordinates[1]])
    end

end

function get_code_weird(tokens)
    coordinates = [1, 3]
    numpad = [0xF 0xF 0x1 0xF 0xF; 0xF 0x2 0x3 0x4 0xF; 0x5 0x6 0x7 0x8 0x9; 0xF 0xA 0xB 0xC 0xF; 0xF 0xF 0xD 0xF 0xF]
    println(tokens)
    for token in tokens
        for char in token
            if char == 'U'
                x_change = 0
                y_change = -1
            elseif char == 'R'
                x_change = 1
                y_change = 0
            elseif char == 'D'
                x_change = 0
                y_change = 1
            elseif char == 'L'
                x_change = -1
                y_change = 0
            else
                error( string("Bad Char ", char))
            end

            if good_numpad_index(numpad, coordinates, y_change, x_change)
                coordinates[2] += y_change
                coordinates[1] += x_change
            end
        end
        # coordinates
        print(uppercase(hex(numpad[coordinates[2], coordinates[1]])))
    end

end

function good_numpad_index(numpad, coordinates, y_change, x_change)
    return size(numpad, 2) >= coordinates[2] + y_change > 0 &&
        size(numpad, 1) >= coordinates[1] + x_change > 0 &&
        numpad[coordinates[2] + y_change, coordinates[1] + x_change] != 0xF
end

file = open("input.txt")
input = readstring(file)

do_stuff(input)