Module: Expgen::Randomizer

Extended by:
Randomizer
Included in:
Randomizer
Defined in:
lib/expgen/randomizer.rb

Instance Method Summary collapse

Instance Method Details

#randomize(tree) ⇒ Object 



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# File 'lib/expgen/randomizer.rb', line 25

def randomize(tree)
  case tree
    when Array              then tree.map { |el| randomize(el) }.join
    when Nodes::Alternation then randomize(tree.options.sample)
    when Nodes::Group       then repeat(tree.repeat, tree.max) { randomize(tree.elements) }
    when Nodes::Character   then repeat(tree.repeat, tree.max) { tree.chars.sample }
  end
end

#range(min, max) ⇒ Object 



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# File 'lib/expgen/randomizer.rb', line 5

def range(min, max)
  if min == "*"
    [0,5]
  elsif min == "+"
    [1,5]
  elsif min and max
    [min, max]
  elsif min
    [min, min]
  else
    [1,1]
  end
end

#repeat(min, max) ⇒ Object 



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# File 'lib/expgen/randomizer.rb', line 19

def repeat(min, max)
  first, last = range(min, max)
  number = rand(last - first + 1) + first
  number.times.map { yield }.join
end