progs/bfc.scala
changeset 634 2c46407af618
parent 633 e4889da2fe29
child 635 7c2c0f10c424
--- a/progs/bfc.scala	Thu Sep 26 11:00:17 2019 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,76 +0,0 @@
-// A Transpiler for the Brainf*** language
-//=========================================
-
-import io.Source
-import scala.util._
-
-
-// loding a bf-file 
-def load_bff(name: String) : String = 
-  Try(Source.fromFile(name)("ISO-8859-1").mkString).getOrElse("")
-
-
-// simple instructions
-def instr(c: Char) : String = c match {
-  case '>' => "ptr++;"
-  case '<' => "ptr--;"
-  case '+' => "(*ptr)++;"
-  case '-' => "(*ptr)--;"
-  case '.' => "putchar(*ptr);"
-  case ',' => "*ptr = getchar();\n"
-  case '['  => "while(*ptr){"
-  case ']'  => "}"
-  case _ => ""
-}
-
-def instrs(prog: String) : String =
-  prog.toList.map(instr(_)).mkString
-
-
-def compile_str(prog: String) : String = {
-  "#include <string.h>\n" ++
-  "#include <stdio.h>\n" ++
-  "char field[30000];\n" ++
-  "char *ptr = &field[15000];" ++
-  "int main()\n{\n" ++
-  "memset(field, '\\0', 30000);\n" ++
-  instrs(prog) ++
-  "\n return 0;\n}"
-}
-
-def compile(name: String, prog: String) = {
-  val fw = new java.io.FileWriter(name + ".c") 
-  val is = compile_str(prog)
-  //println(is)
-  fw.write(is) 
-  fw.close()
-}
-
-import sys.process._
-
-def compile_run(prog: String) = {
-  compile("tmp", prog)
-  "gcc -O0 -o tmp tmp.c".!
-  "./tmp".!
-  ()
-}
-
-def time_needed[T](n: Int, code: => T) = {
-  val start = System.nanoTime()
-  for (i <- 0 until n) code
-  val end = System.nanoTime()
-  (end - start)/(n * 1.0e9)
-}
-
-
-println(s"${time_needed(1, compile_run(load_bff("mandelbrot.bf")))} secs")
-
-
-
-// a benchmark program (counts down from 'Z' to 'A')
-val b1 = """>++[<+++++++++++++>-]<[[>+>+<<-]>[<+>-]++++++++
-            [>++++++++<-]>.[-]<<>++++++++++[>++++++++++[>++
-            ++++++++[>++++++++++[>++++++++++[>++++++++++[>+
-            +++++++++[-]<-]<-]<-]<-]<-]<-]<-]++++++++++."""
-
-println(s"${time_needed(1, compile_run(b1))} secs")