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Contents
require_relative 'edge'
module Rley # This module is used as a namespace
module GFG # This module is used as a namespace
# Specialization of an edge in a grammar flow graph
# that has a end vertex (X.) as its head
# and an item vertex as its tail
# Responsibilities:
# - To know the successor vertex (tail)
class ReturnEdge < Edge
attr_reader(:key)
# Pre-condition: thePredecessor is an EndVertex
# Pre-condition: theSuccessor is an ItemVertex
def initialize(thePredecessor, theSuccessor)
super(thePredecessor, theSuccessor)
do_set_key(thePredecessor, theSuccessor)
end
private
def do_set_key(_thePredecessor, theSuccessor)
tail_d_item = theSuccessor.dotted_item
prefix = "RET_#{tail_d_item.production.object_id}_"
@key = prefix + tail_d_item.prev_position.to_s
end
end # class
end # module
end # module
# End of file
Version data entries
46 entries across 46 versions & 1 rubygems