SPP Compiler

This repository contains a compiler written in Rust for a simple programming language (SPP).

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Prerequisites

To use this compiler, you need:

• Rust compiler (rustc) and Cargo

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

• NASM (Netwide Assembler)
• ld (GNU Linker)

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Running the Compiler

Build the Compiler

cargo build

Compile Example Code

cargo run examples/sample.spp

Convert Assembly Output to Executable (Optional)

nasm -f elf64 build/out.asm -o build/out.o && \
ld -m elf_x86_64 -o build/out build/out.o && \
./build/out

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Features

Currently, the SPP language supports:

Comments

• Single line comments (//)
• Multi line comments (/* */)

Data Types

• Integers
• Floating-point numbers
• String literals (With both single- and double quotes)
• Booleans (true/false)
• Arrays (mixed types supported)
• Null values

Constants

• Constant declarations with compile-time evaluation
• Constants of any supported data type
• Complex expressions in constant initialization
• Constants can reference other constants

Operations

• Arithmetic operations (+, -, *, /)
• Comparison operations (==, !=, <, >, <=, >=)
• String concatenation
• Mixed-type operations (e.g., adding strings and numbers)

Control Flow

• If statements with condition evaluation
  • Supports both simple and complex conditions
  • else clauses for alternative execution paths
  • Nested if statements for complex logic
  • Variable assignments inside conditional blocks
• Program termination: exit(code);

Input/Output

• Console output: console.print("Text");
• String interpolation: console.print("Value: " + variable);

Assembly Generation

• Generates x86_64 NASM assembly
• Optimized constant handling
• Proper memory management

Example

const username = "Stiwyy";
const currentDate = "2025-08-14";
const currentTime = "23:53:15";

console.print("SPP Demo");
console.print("User: " + username);
console.print("Date: " + currentDate + " " + currentTime);

const pi = 3.14159;
const radius = 5;
const area = pi * radius * radius;
console.print("Circle area: " + area);

// If statement example
let temperature = 22;
if (temperature > 25) {
    console.print("It's warm today!");
} else {
    console.print("It's a cool day.");
}

// Nested if example
let hour = 14;
if (hour < 12) {
    console.print("Good morning!");
} else {
    if (hour < 18) {
        console.print("Good afternoon!");
    } else {
        console.print("Good evening!");
    }
}

exit(0);

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Project Structure

• src/lexer.rs: Tokenizes the source code
• src/parser.rs: Parses tokens into an AST
• src/ast.rs: Definitions for the abstract syntax tree
• src/codegen.rs: Generates NASM assembly code
• src/main.rs: Main program that connects all components