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Versions: 14
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Stored size: 947 Bytes
Contents
module Stateflow
class IncorrectTransition < Exception; end
class Transition
attr_reader :from, :to, :if, :decide
def initialize(args)
@from = [args[:from]].flatten
@to = args[:to]
@if = args[:if]
@decide = args[:decide]
end
def can_transition?(base)
return true unless @if
execute_action(@if, base)
end
def find_to_state(base)
raise IncorrectTransition.new("Array of destinations and no decision") if @to.is_a?(Array) && @decide.nil?
return @to unless @to.is_a?(Array)
to = execute_action(@decide, base)
@to.include?(to) ? to : (raise NoStateFound.new("Decision did not return a state that was set in the 'to' argument"))
end
private
def execute_action(action, base)
case action
when Symbol, String
base.send(action)
when Proc
action.call(base)
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems