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Contents
# encoding: utf-8
module Antelope
module Ace
class Grammar
# Manages a list of the symbols in the grammar.
module Symbols
# A list of all terminals in the grammar. Checks the compiler
# options for terminals, and then returns an array of
# terminals. Caches the result.
#
# @return [Array<Token::Terminal>]
def terminals
@_terminals ||= begin
@compiler.options.fetch(:terminals, []).map do |v|
Token::Terminal.new(*v)
end
end
end
# A list of all nonterminals in the grammar.
#
# @return [Array<Symbol>]
# @see #productions
def nonterminals
@_nonterminals ||= productions.keys
end
# A list of all nonterminals, with types.
#
# @return [Array<Token::Nonterminal>>]
def typed_nonterminals
@_typed_nonterminals ||= begin
typed = []
compiler.options[:nonterminals].each do |data|
data[1].each do |nonterm|
typed << Token::Nonterminal.new(nonterm, data[0])
end
end
typed
end
end
# A list of all symbols in the grammar; includes both
# terminals and nonterminals.
#
# @return [Array<Token::Terminal, Symbol>]
# @see #terminals
# @see #nonterminals
def symbols
@_symbols ||= terminals + nonterminals
end
# Checks to see if the grammar uses the `error` terminal
# anywhere.
#
# @return [Boolean]
def contains_error_token?
all_productions.any? { |_| _.items.any?(&:error?) }
end
end
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems