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bf.ex
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bf.ex
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defmodule BF.Tape do
alias BF.Tape, as: Tape
defstruct data: :array.new(default: 0), pos: 0
def current(tape) do
:array.get(tape.pos, tape.data)
end
def inc(tape, x) when x == -1 or x == 1 do
new_data = :array.set(tape.pos, :array.get(tape.pos, tape.data) + x,
tape.data)
%Tape{tape | data: new_data}
end
def move(tape, x) when x == -1 or x == 1 do
new_pos = tape.pos + x
new_data =
if new_pos < :array.size(tape.data) do
tape.data
else
:array.set(new_pos, 0, tape.data)
end
%Tape{tape | data: new_data, pos: new_pos}
end
end
defmodule Printer do
@enforce_keys [:quiet]
defstruct [:quiet, sum1: 0, sum2: 0]
def print(n, p) do
if p.quiet do
new_sum1 = rem(p.sum1 + n, 255)
new_sum2 = rem(p.sum2 + new_sum1, 255)
%Printer{p | sum1: new_sum1, sum2: new_sum2}
else
:ok = IO.binwrite([n])
:file.sync(:stdout)
p
end
end
def get_checksum(p) do
use Bitwise
(p.sum2 <<< 8) ||| p.sum1
end
end
defmodule BF do
alias BF.Tape, as: Tape
def parse(source) do
{result, []} = parse(String.split(source, ""), [])
result
end
defp parse([], acc) do
{Enum.reverse(acc), []}
end
defp parse([x | xs], acc) do
case x do
"+" -> parse(xs, [{:inc, 1} | acc])
"-" -> parse(xs, [{:inc, -1} | acc])
">" -> parse(xs, [{:move, 1} | acc])
"<" -> parse(xs, [{:move, -1} | acc])
"." -> parse(xs, [{:print, nil} | acc])
"[" ->
{loop_code, new_xs} = parse(xs, [])
parse(new_xs, [{:loop, loop_code} | acc])
"]" -> {Enum.reverse(acc), xs}
_ -> parse(xs, acc)
end
end
def run([], tape, p) do
{tape, p}
end
def run(program = [op | ops], tape, p) do
case op do
{:inc, x} -> run(ops, Tape.inc(tape, x), p)
{:move, x} -> run(ops, Tape.move(tape, x), p)
{:print, nil} ->
p = Printer.print(Tape.current(tape), p)
run(ops, tape, p)
{:loop, loop_code} ->
if Tape.current(tape) == 0 do
run(ops, tape, p)
else
{tape, p} = run(loop_code, tape, p)
run(program, tape, p)
end
end
end
end
defmodule Benchmark do
def notify(msg) do
with {:ok, socket} <- :gen_tcp.connect('localhost', 9001, []) do
:gen_tcp.send(socket, msg)
:gen_tcp.close(socket)
end
end
def verify do
text = """
++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>
---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.
"""
left = Printer.get_checksum(
elem(BF.parse(text)
|> BF.run(%BF.Tape{}, %Printer{quiet: true}), 1))
right = Printer.get_checksum(
Enum.reduce(
String.to_charlist("Hello World!\n"),
%Printer{quiet: true},
&Printer.print/2))
if left != right do
IO.puts(:stderr, "#{left} != #{right}")
exit(:shutdown)
end
end
def run do
verify()
[filename] = System.argv()
text = File.read!(filename)
notify("Elixir\t#{System.pid()}")
p = elem(BF.parse(text)
|> BF.run(%BF.Tape{}, %Printer{quiet: System.get_env("QUIET")}), 1)
notify("stop")
if p.quiet do
IO.puts("Output checksum: #{Printer.get_checksum(p)}")
end
end
end
Benchmark.run()