ilyas-kalandar / rita

Just programming language, created fully from scratch for learning compilers.

Rita - just programming language created from scratch!

Motivation.

Every programmer must write at least one compiler/interpreter, I follow this idea :D

What can Rita?

Currently interpreter can execute this program

fun main(){
    print("LOG: Main function loaded");

    var a = 1;
    var b = -1;
    var c = -20;

    print("LOG: Variables created");

    var d = (b * b) - (4 * a * c);

    print("LOG: Discriminant computed, value is", d.toString(d));

    print("LOG: Checking for D < 0");

    if(d < 0){
        print("No roots.");
        return;
    }

    print("LOG: Checking for D equals to 0");

    if(d == 0){
        print("One root.");
        print("Root", -b / (2 * a));

        return;
    }
    

    var x1 = (-b + sqr(d)) / (2 * a);
    var x2 = (-b - sqr(d)) / (2 * a);

    print("LOG: Roots computed.");

    print("Two roots.");
    print("First root:", x1.toString(x1));
    print("Second root:", x2.toString(x2));
}

main();

Tutorial

Variables

Rita is dynamically typed language, you don't need to provide a typename for creating a variable, just only use var-keyword provide name and value!

var varName = "Hello, Rita!";

Functions

Rita support functions (fully), you can create, call, return values and provide arguments to your functions

// Create function with fun - keyword.

fun functionName(arg){
  anotherFunc(); // call another function.
  print(arg);
  return;
}

If statements.

If statement in Rita is similiar to Rust, if keyword, expression and body.

if a > 0{
  print("Really, a is bigger than 0!");
}

While statements

Rita support while statements, use while-keyword, provide expression and code-block.

var a = 100;

while a > 0 {
    print("working");
    a -= 1;
}

Operators

Yes, you can use operators, priorities in Rita are fully correct.

var a = 2 + 2 * 3; // a equals to 8

Standard-functions

sqr(); // Returns a square root of Int-object.
print(); // Prints string to terminal
input(); // EXPERIMENTAL! Returns a string given from user.

Building

Clone repo

git clone https://github.com/ilyas-kalandar/Rita

Create directory for build & move

cd Rita && mkdir build && cd build

Build

cmake .. && cmake --build .

Running

./rita

Output of ./rita --help

Usage: rita --file filename.rt
--ast - Show ast.
--tokens - Show tokens from tokenizer.
--help - Show this menu.
--version - Output version of language.

TODO

• - While-loops
• - Classes
• - Floats

Author

Created with ♥ by Ilyas Qalandarzoda (Awaitable)

Contacts

I always check my telegram

rita's Issues

[WANTFIX]: Recursion doen't work!

Hey, @ilyas-kalandar !
In trying to run programming with recursion, the result of running program was "segmentation fault"! Please see here for the screenshot!

The Project Rita is great. However, it has minuses. Please fix this error.