You might be better off linking directly to the source code: https://github.com/m3m0ry/drainfuck/blob/master/source/app.d

For people unfamiliar with D, a mixin is essentially equivalent to compile-time eval. you call mixin() with a string, that call then gets replaced with that string compiled as D code. Combine that with the fact that you can run arbitrary code at compile time in D and you get brainfuck-as-a-DSL in 27 lines of code.