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# frozen_string_literal: true
require_relative 'composite_node'
module Rley # This module is used as a namespace
module SPPF # This module is used as a namespace
# A node in a parse forest that is a child
# of a parent node with :or refinement
class AlternativeNode < CompositeNode
# @return [String] GFG vertex label
attr_reader(:label)
# @return [Syntax::NonTerminal] Link to lhs symbol
attr_reader(:symbol)
# @param aVertex [GFG::ItemVertex]
# A GFG vertex that corresponds to a dotted item
# with the dot at the end) for the alternative under consideration.
# @param aRange [Lexical::TokenRange]
# A range of token indices corresponding to this node.
def initialize(aVertex, aRange)
super(aRange)
@label = aVertex.label
@symbol = aVertex.dotted_item.lhs
end
# Emit a (formatted) string representation of the node.
# Mainly used for diagnosis/debugging purposes.
# @return [String]
def to_string(indentation)
"Alt(#{label})#{range.to_string(indentation)}"
end
# Part of the 'visitee' role in Visitor design pattern.
# @param aVisitor[ParseTreeVisitor] the visitor
def accept(aVisitor)
aVisitor.visit_alternative(self)
end
end # class
end # module
end # module
# End of file
Version data entries
12 entries across 12 versions & 1 rubygems