https://github.com/jezza/brustfuck
Brainfuck in Rust. The "I regret nothing" Project.
https://github.com/jezza/brustfuck
Last synced: 9 months ago
JSON representation
Brainfuck in Rust. The "I regret nothing" Project.
- Host: GitHub
- URL: https://github.com/jezza/brustfuck
- Owner: Jezza
- Created: 2020-02-24T16:28:46.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2020-03-16T21:07:37.000Z (about 6 years ago)
- Last Synced: 2025-04-06T09:14:31.869Z (about 1 year ago)
- Language: Rust
- Size: 4.88 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# brustfuck
Brainfuck in Rust. The "I regret nothing" Project.
An entirely declarative brainfuck macro.
The `brainfuck` generates a function that takes two parameters.
A `std::io::Read` and a `std::io::Write`.
```rust
use std::io::Write;
use brustfuck::brainfuck;
fn main() {
let function = brainfuck! {
// [ This program prints "Hello World!" and a newline to the screen, its
// length is 106 active command characters. [It is not the shortest.]
//
// This loop is an "initial comment loop", a simple way of adding a comment
// to a BF program such that you don't have to worry about any command
// characters. Any ".", ",", "+", "-", "<" and ">" characters are simply
// ignored, the "[" and "]" characters just have to be balanced. This
// loop and the commands it contains are ignored because the current cell
// defaults to a value of 0; the 0 value causes this loop to be skipped.
// ]
++++++++ // Set Cell #0 to 8
[
>++++ // Add 4 to Cell #1; this will always set Cell #1 to 4
[ // as the cell will be cleared by the loop
>++ // Add 2 to Cell #2
>+++ // Add 3 to Cell #3
>+++ // Add 3 to Cell #4
>+ // Add 1 to Cell #5
<<<<- // Decrement the loop counter in Cell #1
] // Loop till Cell #1 is zero; number of iterations is 4
>+ // Add 1 to Cell #2
>+ // Add 1 to Cell #3
>- // Subtract 1 from Cell #4
>>+ // Add 1 to Cell #6
[<] // Move back to the first zero cell you find; this will
// be Cell #1 which was cleared by the previous loop
<- // Decrement the loop Counter in Cell #0
] // Loop till Cell #0 is zero; number of iterations is 8
// The result of this is:
// Cell No : 0 1 2 3 4 5 6
// Contents: 0 0 72 104 88 32 8
// Pointer : ^
>>. // Cell #2 has value 72 which is 'H'
>---. // Subtract 3 from Cell #3 to get 101 which is 'e'
+++++++..+++. // Likewise for 'llo' from Cell #3
>>. // Cell #5 is 32 for the space
<-. // Subtract 1 from Cell #4 for 87 to give a 'W'
<. // Cell #3 was set to 'o' from the end of 'Hello'
+++.------.--------. // Cell #3 for 'rl' and 'd'
>>+. // Add 1 to Cell #5 gives us an exclamation point
>++. // And finally a newline from Cell #6
};
let mut output = vec![];
function(&mut std::io::stdin().lock(), &mut output).unwrap();
println!("Output:");
std::io::stdout().write_all(&output).unwrap();
}
```
`Output: Hello World!`