Please Forward: Ruby Quiz Submission

ruby-talk
1

From: Wolfgang Seeberg <wolfgang.seeberg@yahoo.com>
Date: April 23, 2007 8:44:04 AM CDT
To: submission@rubyquiz.com
Subject: Please Forward: Ruby Quiz Submission

# Usage: ruby q121.rb
# displays all possible letter sequences for a line of morse code.

Morsehash = Hash[*%w(
    a .- b -... c -.-. d -.. e . f ..-. g --.
    h .... i .. j .--- k -.- l .-.. m -- n -.
    o --- p .--. q --.- r .-. s ... t - u ..-
    v ...- w .-- x -..- y -.-- z --..
)]

Dictionary = Hash[*%w(ruby i ieee sos).collect{ | x | [x, 1] }.flatten]

def eat(morsecode, string = "")
    if morsecode == ""
        printf " in dictionary: " if Dictionary.has_key?(string)
        puts string
    else
        Morsehash.each do | letter, code |
            if morsecode[0, code.size] == code
                eat(morsecode[code.size .. -1], string + letter)
            end
        end
    end
end

STDERR.printf "enter morse code: "
while gets
    eat($_.tr("^---.", ""))
end

#-------------------- End ---------------------------

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