# Brainfuck => D compiler translator
# This produces the faster executable from a BF program
# Program inspired by BF2C (x) 2003 Thomas Cort

from sys import argv

def convert(prog, outfile):
    conv = {'+': "++*p;",
            '-': "--*p;",
            '.': "putchar(*p);",
            ',': "*p=getchar();",
            '>': "++p;",
            '<': "--p;",
            '[': "while(*p){",
            ']': "}"}

    # Generate first part of the D program

    print >> outfile, """\
import std.c.stdio: getchar, putchar;
void main() {
ubyte[30000] x; // ubyte or ushort
auto p = x.ptr;
"""

    # convert all BF commands
    for c in prog:
        if c in conv:
            print >> outfile, conv[c]

    # End D program
    print >> outfile, '}'

prog = file(argv[1]).read()
outfile = file(argv[1].partition(".")[0]+".d", "w")
convert(prog, outfile)