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Contents
# frozen_string_literal: true
module Rley # This module is used as a namespace
module Syntax # This module is used as a namespace
# Abstract class for grammar symbols.
# A grammar symbol is an element that appears in grammar rules.
class GrmSymbol
# @return [String] The name of the grammar symbol
attr_reader(:name)
# An indicator that tells whether the grammar symbol can generate a
# non-empty string of terminals.
attr_writer(:generative)
# Constructor.
# aName [String] The name of the grammar symbol.
def initialize(aName)
raise 'Internal error: nil name encountered' if aName.nil?
@name = aName.dup
@name.freeze
end
# The String representation of the grammar symbol
# @return [String]
def to_s
name.to_s
end
# @return [Boolean] true iff the symbol is a terminal
def terminal?
# Default implementation to override if necessary
false
end
# @return [Boolean] true iff the symbol is generative.
def generative?
@generative
end
end # class
end # module
end # module
# End of file
Version data entries
7 entries across 7 versions & 1 rubygems