class Pushdown::Transition::Replace
A replace transition – remove all currents states from the stack and add a different one.
Attributes
data[R]
The data object to pass to the state_class
's constructor
state_class[R]
The State to replace the stack members with.
Public Class Methods
new( name, state_class, data=nil )
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Create a transition that will Replace
all the states on the current stack with an instance of the given state_class
.
Calls superclass method
Pushdown::Transition::new
# File lib/pushdown/transition/replace.rb, line 12 def initialize( name, state_class, data=nil ) super( name ) @state_class = state_class @data = data end
Public Instance Methods
apply( stack )
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Apply the transition to the given stack
.
# File lib/pushdown/transition/replace.rb, line 34 def apply( stack ) state = self.state_class.new( self.data ) self.log.debug "replacing current state with a new state: %p" % [ state ] while ( old_state = stack.pop ) old_state.on_stop end stack.push( state ) state.on_start return stack end