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module StateMachines
# Provides a set of helper methods for generating matchers
module MatcherHelpers
# Represents a state that matches all known states in a machine.
#
# == Examples
#
# class Vehicle
# state_machine do
# before_transition any => :parked, :do => lambda {...}
# before_transition all - :parked => all - :idling, :do => lambda {}
#
# event :park
# transition all => :parked
# end
#
# event :crash
# transition all - :parked => :stalled
# end
# end
# end
#
# In the above example, +all+ will match the following states since they
# are known:
# * +parked+
# * +stalled+
# * +idling+
def all
AllMatcher.instance
end
alias_method :any, :all
# Represents a state that matches the original +from+ state. This is useful
# for defining transitions which are loopbacks.
#
# == Examples
#
# class Vehicle
# state_machine do
# event :ignite
# transition [:idling, :first_gear] => same
# end
# end
# end
#
# In the above example, +same+ will match whichever the from state is. In
# the case of the +ignite+ event, it is essential the same as the following:
#
# transition :parked => :parked, :first_gear => :first_gear
def same
LoopbackMatcher.instance
end
end
end
Version data entries
16 entries across 16 versions & 2 rubygems