BFCompiler

A compiler for the notorious esoteric programming language, BrainF*ck

Here is a table of each of the valid characters in BrainF*ck and their corresponding meanings.

Character	Meaning
>	increment the data pointer (to point to the next cell to the right).
<	decrement the data pointer (to point to the next cell to the left).
+	increment (increase by one) the byte at the data pointer.
-	decrement (decrease by one) the byte at the data pointer.
.	output the byte at the data pointer.
,	accept one byte of input, storing its value in the byte at the data pointer.
[	if the byte at the data pointer is zero, then instead of moving the instruction pointer forward to the next command, jump it forward to the command after the matching ] command.
]	if the byte at the data pointer is nonzero, then instead of moving the instruction pointer forward to the next command, jump it back to the command after the matching [ command.

Usage

compile.py [-h] [-r] [in_file] [out_file]

• input filepath defaults to "in.txt"
• output filepath defaults to "out.py"
• does not run compiled code without "-r"

Example

(base) l-winston@Winstons-MacBook-Pro BFCompiler % python compile.py in.txt out.py -r
Executing out.py...
Hello World!

in.txt

+++++ +++++             (initialize counter (cell #0) to 10)
[                       (use loop to set the next four cells to 70/100/30/10)
    > +++++ ++          (    add  7 to cell #1)
    > +++++ +++++       (    add 10 to cell #2 )
    > +++               (    add  3 to cell #3)
    > +                 (    add  1 to cell #4)
    <<<< -              (    decrement counter (cell #0))
]                   
> ++ .                  (print 'H')
> + .                   (print 'e')
+++++ ++ .              (print 'l')
.                       (print 'l')
+++ .                   (print 'o')
> ++ .                  (print ' ')
<< +++++ +++++ +++++ .  (print 'W')
> .                     (print 'o')
+++ .                   (print 'r')
----- - .               (print 'l')
----- --- .             (print 'd')
> + .                   (print bang)
> .                     (print '\n')

out.py

import numpy as np
MEMORY_LENGTH = 30000
memory = np.zeros((MEMORY_LENGTH), dtype=int)
index = 0
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
while(memory[index]):
	index+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	index+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	index+=1
	memory[index]+=1
	memory[index]+=1
	memory[index]+=1
	index+=1
	memory[index]+=1
	index-=1
	index-=1
	index-=1
	index-=1
	memory[index]-=1
index+=1
memory[index]+=1
memory[index]+=1
print(chr(memory[index]), end="")
index+=1
memory[index]+=1
print(chr(memory[index]), end="")
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
print(chr(memory[index]), end="")
print(chr(memory[index]), end="")
memory[index]+=1
memory[index]+=1
memory[index]+=1
print(chr(memory[index]), end="")
index+=1
memory[index]+=1
memory[index]+=1
print(chr(memory[index]), end="")
index-=1
index-=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
memory[index]+=1
print(chr(memory[index]), end="")
index+=1
print(chr(memory[index]), end="")
memory[index]+=1
memory[index]+=1
memory[index]+=1
print(chr(memory[index]), end="")
memory[index]-=1
memory[index]-=1
memory[index]-=1
memory[index]-=1
memory[index]-=1
memory[index]-=1
print(chr(memory[index]), end="")
memory[index]-=1
memory[index]-=1
memory[index]-=1
memory[index]-=1
memory[index]-=1
memory[index]-=1
memory[index]-=1
memory[index]-=1
print(chr(memory[index]), end="")
index+=1
memory[index]+=1
print(chr(memory[index]), end="")
index+=1
print(chr(memory[index]), end="")