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BrainfuckBenchmark.scala
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BrainfuckBenchmark.scala
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// Taken from https://github.com/kostya/benchmarks/blob/master/brainfuck2/bf.scala
//
// Copyright (c) 2014 'Konstantin Makarchev'
//
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
package brainfuck
import benchmarks.{BenchmarkRunningTime, LongRunningTime}
class BrainfuckBenchmark extends benchmarks.Benchmark[String] {
override val runningTime: BenchmarkRunningTime = LongRunningTime
override def run(): String = {
new Program(Program.asText).run
}
override def check(result: String) =
Program.expectedOutput == result.size
}
abstract class Op
case class Inc(v: Int) extends Op
case class Move(v: Int) extends Op
case class Print() extends Op
case class Loop(loop: Array[Op]) extends Op
case class Nop() extends Op
class Tape() {
private var tape = Array(0)
private var pos = 0
def get = tape(pos)
def inc(x: Int) = tape(pos) += x
def move(x: Int) = {
pos += x
while (pos >= tape.length) { tape :+= 0 }
}
}
class Program(text: String) {
var ops = parse(text.iterator)
def parse(iterator: Iterator[Char]): Array[Op] = {
var res = Array[Op]()
while (iterator.hasNext) {
val op = iterator.next() match {
case '+' => new Inc(1)
case '-' => new Inc(-1)
case '>' => new Move(1)
case '<' => new Move(-1)
case '.' => new Print()
case '[' => new Loop(parse(iterator))
case ']' => return res
case _ => new Nop()
}
op match {
case Nop() => ()
case _ => res :+= op
}
}
res
}
def run = {
val stringBuilder = new StringBuilder
_run(ops, new Tape(), stringBuilder)
stringBuilder.toString
}
def _run(program: Array[Op], tape: Tape, output: StringBuilder) {
for (op <- program) op match {
case Inc(x) => tape.inc(x)
case Move(x) => tape.move(x)
case Loop(loop) => while (tape.get > 0) _run(loop, tape, output)
case Print() => output.append(tape.get.toChar)
}
}
}
object Program {
// From https://copy.sh/brainfuck/
// 99 bottles in 1752 brainfuck instructions
// by jim crawford (http://www (dot) goombas (dot) org/)
val asText: String =
"""+++++++++>+++++++++>>>++++++[<+++>-]+++++++++>+++++++++>>>>>>+++++++
|++++++[<++++++>-]>+++++++++++[<++++++++++>-]<+>>++++++++[<++++>-]>++
|+++++++++[<++++++++++>-]<->>+++++++++++[<++++++++++>-]<+>>>+++++[<++
|++>-]<-[<++++++>-]>++++++++++[<++++++++++>-]<+>>>+++++++[<+++++++>-]
|>>>++++++++[<++++>-]>++++++++[<++++>-]>+++++++++++[<+++++++++>-]<->>
|++++++++[<++++>-]>+++++++++++[<++++++++++>-]<+>>++++++++[<++++>-]>>+
|++++++[<++++>-]<+[<++++>-]>++++++++[<++++>-]>>+++++++[<++++>-]<+[<++
|++>-]>>++++++++++++[<+++++++++>-]++++++++++>>++++++++++[<++++++++++>
|-]<+>>++++++++++++[<+++++++++>-]>>++++++++++++[<+++++++++>-]>>++++++
|[<++++>-]<-[<+++++>-]>++++++++++++[<++++++++>-]<+>>>>++++[<++++>-]<+
|[<+++++++>-]>++++++++[<++++>-]>++++++++[<++++>-]>+++++++++++[<++++++
|++++>-]<+>>++++++++++[<++++++++++>-]<+>>>++++[<++++>-]<+[<++++++>-]>
|+++++++++++++[<++++++++>-]>++++++++[<++++>-]>>+++++++[<++++>-]<+[<++
|++>-]>+++++++++++[<+++++++++>-]<->>++++++++[<++++>-]>++++++++++[<+++
|+++++++>-]<+>>+++++++++++[<++++++++++>-]>++++++++++[<++++++++++>-]<+
|>>+++++++++++[<++++++++++>-]<+>>>+++++[<++++>-]<-[<++++++>-]>+++++++
|+[<++++>-]>++++++++++>>>>++++++++++++[<+++++++>-]++++++++++>>+++++++
|+++++[<++++++++>-]<+>>++++++++++[<++++++++++>-]>++++++++++++[<++++++
|+++>-]<->>+++++++++++[<++++++++++>-]>++++++++++[<++++++++++>-]<+>>++
|+++++++++++[<+++++++++>-]>++++++++[<++++>-]>+++++++++++[<++++++++++>
|-]<+>>>>+++++[<++++>-]<-[<++++++>-]>+++++++++++[<++++++++++>-]<+>>++
|++++++++++[<++++++++>-]<+>>+++++++++++[<++++++++++>-]>++++++++[<++++
|>-]>++++++++++[<++++++++++>-]<+>>>+++++++[<++++>-]<+[<++++>-]>>>++++
|+[<+++>-]<[<+++++++>-]>>+++++[<+++>-]<[<+++++++>-]>++++++++[<++++>-]
|>>+++++++[<++++>-]<+[<++++>-]>>++++++[<++++>-]<-[<+++++>-]>>>++++++[
|<++++>-]<-[<+++++>-]>++++++++[<++++>-]>++++++++++++[<++++++++>-]<+>>
|++++++++++[<++++++++++>-]>>++++[<++++>-]<[<+++++++>-]>+++++++++++[<+
|+++++++++>-]<+>>++++++++[<++++>-]>>++++[<++++>-]<+[<+++++++>-]>+++++
|+++++[<++++++++++>-]>+++++++++++[<++++++++++>-]>+++++++++++[<+++++++
|+++>-]>++++++++[<++++>-]>++++++++++++[<++++++++>-]<+[<]<[<]<[<]<[<]<
|<<<[<]<[<]<[<]<[<]<<<<[<]<<<<<<[>>[<<[>>>+>+<<<<-]>>>[<<<+>>>-]<[>+<
|-]>>-[>-<[-]]>+[<+>-]<<<]>>[<<<<[-]>>>>>>>[>]>.>>>[.>>]>[>]>>[.>>]<[
|.<<]<[<]<<.>>>[.>>]>[>]>>[.>>]>.>>>[.>>]>[>]>>[.>>]>>[.>>]<[.<<]<<<<
|[<]<[<]<[<]<[<]<<<<[<]>[.>]>>>>[.>>]>>[.>>]>>[.>>]<[.<<]<[<]<<<<[<]<
|<-]<<<<[[-]>>>[<+>-]<<[>>+>+<<<-]>>>[<<<+>>>-]<[<<<++++++++[>++++++<
|-]>>>[-]]++++++++[<++++++>-]<<[.>.>]>[.>>]>>>[>]>>>>[.>>]>>[.>>]>>[.
|>>]<[.<<]<[<]<<<<[<]<<<<<[.>.>]>[.>>]<<<[-]>[-]>>>>>[>]>>>>[.>>]>>[.
|>>]>>[.>>]>.>>>[.>>]>>[.>>]>[>]>>[.>>]<[.<<]<<<<[<]<[<]<[<]<[<]<<<<[
|<]<<<<<<]<<[>+>+<<-]>>[<<+>>-]<[>-<[-]]>+[<+>-]<[<++++++++++<->>-]<<
|[>>+>+>+<<<<-]>>[<<+>>-]<-[>+>+>>+<<<<-]>[<+>-]>>>[<<[>>>+>+<<<<-]>>
|>[<<<+>>>-]<[>+<-]>>-[>-<[-]]>+[<+>-]<<<]>>[<<<<[-]>>>>>>>[>]>.>>>[.
|>>]>[>]>>[.>>]<[.<<]<[<]<<<<[<]<<-]<<<<[[-]>>>[<+>-]<<[>>+>+<<<-]>>>
|[<<<+>>>-]<[<<<++++++++[>++++++<-]>>>[-]]++++++++[<++++++>-]<<[.>.>]
|>[.>>]<<<[-]>[-]>>>>>[>]>>>>[.>>]>>[.>>]>>[.>>]<[.<<]<[<]<<<<[<]<<<<
|<<]++++++++++.[-]<<<[>>+>+>+<<<<-]>>[<<+>>-]<[>+>+>>+<<<<-]>[<+>-]>]
|""".stripMargin
val expectedOutput = 11359
}