A simple interpreter written entirely in Rust. It parses custom .stl code, compiles it to bytecode, and then runs it using a custom-built virtual machine. This project is made entirely for educational purpooses to understand the working of a Bytecode Interpreter.

• Fully custom language with .stl extension.
• Lexer, Parser, Compiler, and VM for interpreting written from scratch in Rust
• Support for:
  • Variables (local and global)
  • Arithmetic operations
  • Control flow: if, else, while, for
  • Simple built-in print statement

• Scanner(Lexer): Converts source code into a stream of tokens.
• Compilation: A single pass compiler that consumes tokens and directly emits bytecode.
• Execution: A stack-based VM interprets the bytecode.

Here's an example .stl program that calculates the factorial of 10:

{
    let n = 10;
    let factorial = 1;
    for(let i = n; i > 0; i = i - 1){
        factorial = factorial * i;
    }
    print factorial;
}

• Rust (latest stable)

git clone https://github.com/shorya-1012/stellis.git
cd stellis

cargo build --release

cargo run -- path/to/your_file.stl