Sha256: cf1f669d9f6f6a14c1c980a2d13e2b61f8dad7eff5c436ee4a624dabc723f38e
Contents?: true
Size: 1.09 KB
Versions: 17
Compression:
Stored size: 1.09 KB
Contents
# frozen_string_literal: true
require_relative 'grm_symbol'
module Dendroid
module Syntax
# A terminal symbol is an elementary symbol of the language defined by the grammar.
# More specifically, it represents a class of 'words'(or a token) of the language.
class Terminal < GrmSymbol
# Constructor.
# aSymbolName [String] The name of the grammar symbol.
def initialize(symbolName)
super(symbolName)
freeze
end
# Predicate method to check whether the symbol is a terminal symbol.
# @return [TrueClass]
def terminal?
true
end
# Predicate method to check whether the symbol derives (matches)
# the empty string. As a terminal symbol corresponds to an input token,
# it is by definition non-nullable.
# @return [FalseClass]
def nullable?
false
end
# Predicate method to check whether the symbol always matches
# a non-empty sequence of terminal symbols.
# @return [TrueClass]
def productive?
true
end
end # class
end # module
end # module
Version data entries
17 entries across 17 versions & 1 rubygems