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I made a scripting language in Rust for fun

lechatthecat profile image lechat Updated on ・2 min read

I wouldn't say my code is beautiful but you can see all the code in the github repository.
https://github.com/lechatthecat/oran

I made a scripting language in Rust. You can try this language by

$ git clone https://github.com/lechatthecat/oran.git
$ cd oran
$ cargo build --release
$ ./target/release/oran -f ./examples/hello.orn
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Please note that you need to install git and Rust in your PC beforehand.

Then you can see 'Hello World' is printed as follows:

$ ./target/release/oran -f  ./examples/hello.orn 
Hello World.
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In this language, you can define functions as follows:

fn test () {
    println('hello');
}

test();
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You can copy-and-paste the above in ./examples/hello.orn and run it. If you run this script, you can see the function is called as follows:

$ ./target/release/oran -f  ./examples/hello.orn 
hello
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Of course you can define variables as follows:

fn test () {
    let test = 'hey';
    println(test);
}

test();
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$ ./target/release/oran -f  ./examples/hello.orn 
hey
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But variables are immutable by default. You can't substitute other values to the variable.

fn test () {
    let test = 'hey';
    test = 'hello'; // error!
    println(test);
}

test();
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You must define it as a mutable variable to substitute other values:

fn test () {
    let mut test = 'hey';
    test = 'hello'; // Now it runs
    println(test);
}

test();
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You can also use for-loop in this language.

fn test () {
    let test = ' test';
    for i in 0..5 {
        println(i << test);
    }
}

test();
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Result:

$ ./target/release/oran -f  ./examples/hello.orn 
0 test
1 test
2 test
3 test
4 test
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If you want to do inclusive for-loop, you can write as follows:

fn test () {
    let test = ' test';
    for i in 0..=5 {
        println(i << test);
    }
}

test();
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Result:

$ ./target/release/oran -f  ./examples/hello.orn 
0 test
1 test
2 test
3 test
4 test
5 test
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You can also use 'if':

fn test (test1, test2) {
    return test1 + test2;
}

if test(5,5) == 10 {
   println('it is ten!');
}
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Result:

$ ./target/release/oran -f  ./examples/hello.orn
it is ten!
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Escaping is also implemented:

fn test (test1, test2) {
    test1 + test2
}
let t = 10;
if t == test(5,5) {
   println("variable \"t\" is " << t);
}
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Result:

$ ./target/release/oran -f  ./examples/hello.orn 
variable "t" is 10
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Also, as you could see, you can omit 'return' in function just like in Rust:

/*  both functions work  */
fn test (test1, test2) {
    test1 + test2
}
fn test2 (test1, test2) {
    return test1 * test2;
}

println(test(5,5));
println(test2(5,5));
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You can see many other random dirty examples in
https://github.com/lechatthecat/oran/blob/master/examples/example.orn
You can run it by:

$ ./target/release/oran -f  ./examples/example.orn 
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Discussion (2)

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levirs565 profile image
Levi Rizki Saputra

Great project!

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lechatthecat profile image
lechat Author

Thank you very much :)