A Brainfuck interpreter written in Julia. Because <-->.

Execute a string containing a Brainfuck program using the brainfuck function:

using Brainfuck
brainfuck("<-->")

To work with a program stored in a file, use readall to generate a string to pass to brainfuck:

using Brainfuck
path = Pkg.dir("Brainfuck", "test", "programs", "hello2.bfk")
brainfuck(readall(path))

If you want to observe the program state evolve operation-by-operation, you can set the debug keyword argument to false when running brainfuck:

using Brainfuck
path = Pkg.dir("Brainfuck", "test", "programs", "hello2.bfk")
brainfuck(readall(path), debug = true)

Be warned that the state evolution of the Brainfuck interpreter will produce a lot of output for even the simplest programs.

OP1: >

Move the Memory Pointer to the next array cell.

OP2: <

Move the Memory Pointer to the previous array cell.

OP3: +

Increment the array cell pointed at by the Memory Pointer.

OP4: -

Decrement the array cell pointed at by the Memory Pointer.

OP5: ,

Read a character from STDIN and put its ASCII value into the cell pointed at by the Memory Pointer.

OP6: .

Print the character with ASCII value equal to the value in the cell pointed at by the Memory Pointer.

OP7: [

Move to the command following the matching ] if the value in the cell pointed at by the Memory Pointer is zero. Note that [ and ] commands nest like pairs of parentheses, and matching pairs are defined in the same way as for parentheses.

OP8: ]

Move to the command following the matching [ if the value in the cell pointed at by the Memory Pointer is non-zero. Note that this implies that the interpreter will work its way backwards through the source code, rather than forwards.