Class PiDigitSpigot < Object

# File benchmark/bm_so_pidigits.rb, line 8
def initialize()
    @z = Transformation.new 1,0,0,1
    @x = Transformation.new 0,0,0,0
    @inverse = Transformation.new 0,0,0,0
end

# File benchmark/bm_so_pidigits.rb, line 33
def consume(a)
    @z.compose(a)
end

# File benchmark/bm_so_pidigits.rb, line 14
def next!
    @y = @z.extract(3)
    if safe? @y
        @z = produce(@y)
        @y
    else
        @z = consume @x.next!()
        next!()
    end
end

# File benchmark/bm_so_pidigits.rb, line 29
def produce(i)
    @inverse.qrst(10,-10*i,0,1).compose(@z)
end

# File benchmark/bm_so_pidigits.rb, line 25
def safe?(digit)
    digit == @z.extract(4)
end