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Contents
# encoding: utf-8
module Antelope
module Ace
# Defines a production.
class Production < Struct.new(:label, :items, :block, :prec, :id)
# @!attribute [rw] label
# The label (or left-hand side) of the production. This
# should be a nonterminal.
#
# @return [Symbol]
# @!attribute [rw] items
# The body (or right-hand side) of the production. This can
# be array of terminals and nonterminals.
#
# @return [Array<Token>]
# @!attribute [rw] block
# The block of code to be executed when the production's right
# hand side is reduced.
#
# @return [String]
# @!attribute [rw] prec
# The precedence declaration for the production.
#
# @return [Ace::Precedence]
# @!attribute [rw] id
# The ID of the production. The starting production always
# has an ID of 0.
#
# @return [Numeric]
# Creates a new production from a hash. The hash's keys
# correspond to the attributes on this class.
#
# @param hash [Hash<(Symbol, Object)>]
def self.from_hash(hash)
new(hash[:label] || hash["label"],
hash[:items] || hash["items"],
hash[:block] || hash["block"],
hash[:prec] || hash["prec"],
hash[:id] || hash["id"])
end
# Create a new version of the production with duplicated values.
#
# @return [Production]
def clone
Production.new(label.dup,
items.map(&:dup),
block.dup,
prec.dup,
id)
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems