class Rantly

Constants

INTEGER_MAX

wanna avoid going into Bignum when calling range with these.

INTEGER_MIN

Attributes

default_size[W]
classifiers[RW]

Public Class Methods

default_size() click to toggle source
# File lib/rantly/generator.rb, line 10
def default_size
  @default_size || 6
end
each(n,limit=10,&block) click to toggle source
# File lib/rantly/generator.rb, line 14
def each(n,limit=10,&block)
  gen.each(n,limit,&block)
end
gen() click to toggle source
# File lib/rantly/generator.rb, line 26
def gen
  self.singleton
end
map(n,limit=10,&block) click to toggle source
# File lib/rantly/generator.rb, line 18
def map(n,limit=10,&block)
  gen.map(n,limit,&block)
end
new() click to toggle source
# File lib/rantly/generator.rb, line 89
def initialize
  reset
end
singleton() click to toggle source
# File lib/rantly/generator.rb, line 5
def singleton
  @singleton ||= Rantly.new
  @singleton
end
value(limit=10,&block) click to toggle source
# File lib/rantly/generator.rb, line 22
def value(limit=10,&block)
  gen.value(limit,&block)
end

Public Instance Methods

array(n=self.size,&block) click to toggle source
# File lib/rantly/generator.rb, line 210
def array(n=self.size,&block)
  n.times.map { self.instance_eval(&block) }
end
boolean() click to toggle source
# File lib/rantly/generator.rb, line 180
def boolean
  range(0,1) == 0 ? true : false
end
branch(*gens) click to toggle source
# File lib/rantly/generator.rb, line 168
def branch(*gens)
  self.call(choose(*gens))
end
call(gen,*args) click to toggle source
# File lib/rantly/generator.rb, line 154
def call(gen,*args)
  case gen
  when Symbol
    return self.send(gen,*args)
  when Array
    raise "empty array" if gen.empty?
    return self.send(gen[0],*gen[1..-1])
  when Proc
    return self.instance_eval(&gen)
  else
    raise "don't know how to call type: #{gen}"
  end
end
choose(*vals) click to toggle source
# File lib/rantly/generator.rb, line 172
def choose(*vals)
  vals[range(0,vals.length-1)]
end
classify(classifier) click to toggle source
# File lib/rantly/generator.rb, line 98
def classify(classifier)
  @classifiers[classifier] += 1
end
dict(n=self.size,&block) click to toggle source
# File lib/rantly/generator.rb, line 214
def dict(n=self.size,&block)
  h = {}
  each(n) do
    k,v = instance_eval(&block)
    h[k] = v if guard(!h.has_key?(k))
  end
  h
end
each(n,limit=10,&block) click to toggle source

limit attempts to 10 times of how many things we want to generate

# File lib/rantly/generator.rb, line 50
def each(n,limit=10,&block)
  generate(n,limit,block)
end
float() click to toggle source
# File lib/rantly/generator.rb, line 144
def float
  rand
end
freq(*pairs) click to toggle source
# File lib/rantly/generator.rb, line 184
def freq(*pairs)
  pairs = pairs.map do |pair|
    case pair
    when Symbol, String, Proc
      [1,pair]
    when Array
      unless pair.first.is_a?(Integer)
        [1] + pair
      else
        pair
      end
    end
  end
  total = pairs.inject(0) { |sum,p| sum + p.first }
  raise(RuntimeError, "Illegal frequency:#{pairs.inspect}") if total == 0
  pos = range(1,total)
  pairs.each do |p|
    weight, gen, *args = p
    if pos <= p[0]
      return self.call(gen,*args)
    else
      pos -= weight
    end
  end
end
generate(n,limit_arg,gen_block,&handler) click to toggle source
# File lib/rantly/generator.rb, line 68
def generate(n,limit_arg,gen_block,&handler)
  limit = n * limit_arg
  nfailed = 0
  nsuccess = 0
  while nsuccess < n
    raise TooManyTries.new(limit_arg*n,nfailed) if limit < 0
    begin
      val = self.instance_eval(&gen_block)
    rescue GuardFailure
      nfailed += 1
      limit -= 1
      next
    end
    nsuccess += 1
    limit -= 1
    handler.call(val) if handler
  end
end
guard(test) click to toggle source
# File lib/rantly/generator.rb, line 102
def guard(test)
  unless test
    raise GuardFailure.new
  else
    true
  end
end
integer(limit=nil) click to toggle source
# File lib/rantly/generator.rb, line 126
def integer(limit=nil)
  case limit
  when Range
    hi = limit.end
    lo = limit.begin
  when Integer
    raise "n should be greater than zero" if limit < 0
    hi, lo = limit, -limit
  else
    hi, lo = INTEGER_MAX, INTEGER_MIN
  end
  range(lo,hi)
end
literal(value) click to toggle source
# File lib/rantly/generator.rb, line 176
def literal(value)
  value
end
map(n,limit=10,&block) click to toggle source
# File lib/rantly/generator.rb, line 54
def map(n,limit=10,&block)
  acc = []
  generate(n,limit,block) do |val|
    acc << val
  end
  acc
end
positive_integer() click to toggle source
# File lib/rantly/generator.rb, line 140
def positive_integer
  range(0)
end
range(lo=nil,hi=nil) click to toggle source
# File lib/rantly/generator.rb, line 148
def range(lo=nil,hi=nil)
  lo ||= INTEGER_MIN
  hi ||= INTEGER_MAX
  rand(hi+1-lo) + lo
end
reset() click to toggle source
# File lib/rantly/generator.rb, line 93
def reset
  @size = nil
  @classifiers = Hash.new(0)
end
size() click to toggle source
# File lib/rantly/generator.rb, line 110
def size
  @size || Rantly.default_size
end
sized(n,&block) click to toggle source
# File lib/rantly/generator.rb, line 114
def sized(n,&block)
  raise "size needs to be greater than zero" if n < 0
  old_size = @size
  @size = n
  r = self.instance_eval(&block)
  @size = old_size
  return r
end
string(char_class=:print) click to toggle source
# File lib/rantly/generator.rb, line 266
def string(char_class=:print)
  chars = case char_class
          when Regexp
            Chars.of(char_class)
          when Symbol
            Chars::CLASSES[char_class]
          end
  raise "bad arg" unless chars

  char_strings = chars.map { |c| c.chr }
  str = Array.new(size)
  current_index = 0
  while current_index < size
    str[current_index] = char_strings.sample
    current_index += 1
  end
  str.join
end
value(limit=10,&block) click to toggle source
# File lib/rantly/generator.rb, line 62
def value(limit=10,&block)
  generate(1,limit,block) do |val|
    return val
  end
end