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brainfsck's Introduction

brainfsck

My interpreter for Urban Müller's esoteric programming language, Brainfuck, written in Go and Python.

References

  1. Wikipedia article

Usage

Go

make build && ./bf <fsck'd file>

Python

$ bf.py --help

Specifications

  1. Start with thirty thousand bytes/cells initialized with values of zero.
  2. Track two cursors: position and instruction.
  3. Ignore everything between balanced brackets if the left bracket exists as the first character on the instruction tape.
  4. Accept single-key input and output, using ASCII characters.

Commands

Instruction Description
[ jump to position after corresponding right bracket, if zero
] jump back to corresponding left bracket, if not zero
, accept one input byte
. output value at the position pointer
+ increment the value at the position pointer (255 rotates to zero)
- decrement the value at the position pointer (0 rotates to 255)
> increment the position pointer (rotate to 0 at tape end)
< decrement the position pointer (rotate to 29999 at tape end)

## Tests

This repository includes test files. The following string should produce "Hello World!".

++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.> ---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.

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