class Reference

# File lib/reference.rb, line 8
def initialize
  @state = :pending
  @on_fulfill_callbacks = []
  @on_reject_callbacks = []
  @backtrace
end

# File lib/reference.rb, line 41
def fulfill(value = nil, backtrace = nil)
  return unless pending?

  @state = :fulfilled
  @value = value
  @backtrace = backtrace

  run_fulfill_callbacks
  value
end

# File lib/reference.rb, line 19
def fulfilled?
  @state.equal?(:fulfilled)
end

# File lib/reference.rb, line 27
def on_fulfill(&callback)
  @on_fulfill_callbacks << callback
  if fulfilled?
    run_fulfill_callback(callback)
  end
end

# File lib/reference.rb, line 34
def on_reject(&callback)
  @on_reject_callbacks << callback
  if rejected?
    run_reject_callback(callback)
  end
end

# File lib/reference.rb, line 15
def pending?
  @state.equal?(:pending)
end

# File lib/reference.rb, line 52
def reject(reason = nil, backtrace = nil)
  return unless pending?

  @state = :rejected
  @reason = reason || Error
  @backtrace = backtrace

  run_reject_callbacks
  reason
end

# File lib/reference.rb, line 23
def rejected?
  @state.equal?(:rejected)
end

# File lib/reference.rb, line 73
def run_fulfill_callback(callback)
  callback.call(@value)
end

# File lib/reference.rb, line 65
def run_fulfill_callbacks
  @on_fulfill_callbacks.each { |callback| run_fulfill_callback(callback) }
end

# File lib/reference.rb, line 77
def run_reject_callback(callback)
  callback.call(@reason)
end

# File lib/reference.rb, line 69
def run_reject_callbacks
  @on_reject_callbacks.each { |callback| run_reject_callback(callback) }
end