Class: Xi::Pattern::EventEnumerator

Inherits:
Object
  • Object
show all
Defined in:
lib/xi/pattern.rb

Instance Method Summary collapse

Constructor Details

#initialize(pattern, cycle) ⇒ EventEnumerator

Returns a new instance of EventEnumerator.



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# File 'lib/xi/pattern.rb', line 442

def initialize(pattern, cycle)
  @cycle = cycle

  @source = pattern.source
  @size = pattern.size
  @iter_size = pattern.iteration_size

  @iter = pattern.duration > 0 ? (cycle / pattern.duration).floor : 0
  @delta_enum = pattern.each_delta(@iter * @iter_size)
  @start = @iter * pattern.duration
  @prev_ev = nil
  @i = 0
end

Instance Method Details

#each(&block) ⇒ Object 



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# File 'lib/xi/pattern.rb', line 456

def each(&block)
  return enum_for(__method__, @cycle) unless block_given?

  return if @size == 0

  if @source.respond_to?(:call)
    loop do
      yielder = ::Enumerator::Yielder.new do |value|
        each_block(value, &block)
      end
      @source.call(yielder, @delta_enum.peek)
    end
  elsif @source.respond_to?(:each_event)
    @source.each_event(@start) do |value, _|
      each_block(value, &block)
    end
  elsif @source.respond_to?(:[])
    loop do
      each_block(@source[@i % @size], &block)
    end
  else
    fail StandardError, 'invalid source'
  end
end