From: mike lupo <mikelupo@...>
Date: 2012-02-25T10:56:23+09:00
Subject: Re: How do I recursively traverse a data structure containing a mix of types?

Thanks Ryan Davis.
Problem #1, not every piece of data passed in is a hash. So
restructuring the function a little helps clarify that. Apologies for my
shoddy first attempt, and thanks again you for your input.

For the readers finding this via search, find the input contained in a
text file attached to my initial post.

#2, I have this working now. Not elegant, hardly fault tolerant, but
works.

#define a boolean "test".
class Object
  def boolean?
    self.is_a?(TrueClass) || self.is_a?(FalseClass)
  end
end

def traverse_data(input, indent="")
  puts "#{indent}traverse_data -- >"

  if input.class==Fixnum
    puts "#{indent}Integer: #{input}"
    return
  end
  if input.boolean?
    puts "#{indent}Boolean: #{input}"
    return
  end
  if input.class==Bignum
    puts "#{indent}Bignum: #{input}"
    return
  end

  input.each do |v|
    case v
      when String then puts "#{indent}STRING #{v}"
        puts "#{indent}<--traverse_data"
        return
      when Array  then v.each_index {|i| #puts
       traverse_data(v[i], "#{indent}  ")}
      when Hash   then puts "#{indent}HASH: #{v}"
        traverse_data(v, "#{indent}  ")
        #return v
      else raise ArgumentError, "Unhandled type #{v.class}"
    end
  end
end

#call it now.
input = {gotten from attached text file}
traverse_data(input)

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