Contents

# frozen_string_literal: true

module Parser

  class Lexer::StackState
    def initialize(name)
      @name  = name.freeze
      clear
    end

    def clear
      @stack = 0
    end

    def push(bit)
      bit_value = bit ? 1 : 0
      @stack = (@stack << 1) | bit_value

      bit
    end

    def pop
      bit_value = @stack & 1
      @stack  >>= 1

      bit_value == 1
    end

    def lexpop
      @stack = ((@stack >> 1) | (@stack & 1))
      @stack[0] == 1
    end

    def active?
      @stack[0] == 1
    end

    def to_s
      "[#{@stack.to_s(2)} <= #{@name}]"
    end

    alias inspect to_s
  end

end

Version data entries

7 entries across 7 versions & 2 rubygems

Version	Path
vagrant-packet-0.1.1	vendor/bundle/ruby/2.4.0/gems/parser-2.5.1.0/lib/parser/lexer/stack_state.rb
parser-2.5.1.0	lib/parser/lexer/stack_state.rb
parser-2.5.0.5	lib/parser/lexer/stack_state.rb
parser-2.5.0.3	lib/parser/lexer/stack_state.rb
parser-2.5.0.2	lib/parser/lexer/stack_state.rb
parser-2.5.0.1	lib/parser/lexer/stack_state.rb
parser-2.5.0.0	lib/parser/lexer/stack_state.rb