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module Lrama
class State
class Reduce
# https://www.gnu.org/software/bison/manual/html_node/Default-Reductions.html
attr_reader :item, :look_ahead, :not_selected_symbols
attr_accessor :default_reduction
def initialize(item)
@item = item
@look_ahead = nil
@not_selected_symbols = []
end
def rule
@item.rule
end
def look_ahead=(look_ahead)
@look_ahead = look_ahead.freeze
end
def add_not_selected_symbol(sym)
@not_selected_symbols << sym
end
def selected_look_ahead
if @look_ahead
@look_ahead - @not_selected_symbols
else
[]
end
end
end
end
end
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