Class: Hegel::Generators::OptionalGenerator

Inherits:
Hegel::Generator show all
Defined in:
lib/hegel/generators.rb,
sig/hegel.rbs

Overview

Hegel::Syntax::Methods#optional. Draws from generator with probability 0.5, nil otherwise. Does not expose a p: keyword: this milestone leaves generate_boolean at its own default probability.

Instance Method Summary collapse

Methods inherited from Hegel::Generator

#filter, #map

Constructor Details

#initialize(generator) ⇒ OptionalGenerator

Returns a new instance of OptionalGenerator.

Parameters:



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# File 'lib/hegel/generators.rb', line 251

def initialize(generator)
  super()
  @generator = generator
end

Instance Method Details

#do_draw(tc) ⇒ Object

Parameters:

  • tc (Object)

Returns:

  • (Object) 


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# File 'lib/hegel/generators.rb', line 256

def do_draw(tc)
  tc.start_span(LibHegel::HEGEL_LABEL_OPTIONAL)
  begin
    tc.generate_boolean ? @generator.do_draw(tc) : nil
  ensure
    tc.stop_span(discard: false)
  end
end