Class: Fuzzer

Inherits:
Object show all
Defined in:
lib/gems/json_pure-1.1.3/tools/fuzz.rb

Instance Method Summary collapse

Constructor Details

#initialize(n, freqs = {}) ⇒ Fuzzer

Returns a new instance of Fuzzer.



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# File 'lib/gems/json_pure-1.1.3/tools/fuzz.rb', line 13

def initialize(n, freqs = {})
  sum = freqs.inject(0.0) { |s, x| s + x.last }
  freqs.each_key { |x| freqs[x] /= sum }
  s = 0.0
  freqs.each_key do |x|
    freqs[x] = s .. (s + t = freqs[x])
    s += t
  end
  @freqs = freqs
  @n = n
  @alpha = (0..0xff).to_a
end

Instance Method Details

#fuzz(current = nil) ⇒ Object 



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# File 'lib/gems/json_pure-1.1.3/tools/fuzz.rb', line 54

def fuzz(current = nil)
  if @n > 0
    case current
    when nil
      @n -= 1
      current = fuzz [ Hash, Array ][rand(2)].new
    when Array
      while @n > 0
        @n -= 1
        current << case p = make_pick
        when Array, Hash
          fuzz(p)
        else
          p
        end
      end
    when Hash
      while @n > 0
        @n -= 1
        current[random_string] = case p = make_pick
        when Array, Hash
          fuzz(p)
        else
          p
        end
      end
    end
  end
  current
end

#make_pick ⇒ Object 



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# File 'lib/gems/json_pure-1.1.3/tools/fuzz.rb', line 38

def make_pick
  k = pick
  case
  when k == Hash, k == Array
    k.new
  when k == true, k == false, k == nil
    k
  when k == String
    random_string
  when k == Fixnum
    rand(2 ** 30) - 2 ** 29
  when k == Bignum
    rand(2 ** 70) - 2 ** 69
  end
end

#pick ⇒ Object 



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# File 'lib/gems/json_pure-1.1.3/tools/fuzz.rb', line 32

def pick
  r = rand
  found = @freqs.find { |k, f| f.include? rand }
  found && found.first
end

#random_string ⇒ Object 



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# File 'lib/gems/json_pure-1.1.3/tools/fuzz.rb', line 26

def random_string
  s = ''
  30.times { s << @alpha[rand(@alpha.size)] }
  s.to_utf8
end