ReiLang

ReiLang is a simple, Python-inspired interpreted programming language built in Java. It supports basic constructs such as variable assignment, arithmetic operations, print statements, and conditional logic.

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✨ Features

• Variable Assignment
• Arithmetic Operations (+, -, *, /)
• Print Statements
• If-Else Conditionals

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🚀 Getting Started

1. Clone the Repo

git clone https://github.com/NamanRajput-git/ReiLang.git
cd rei_lang

2. Build and Run

Ensure you have Java 11+:

javac -d out src/rei/*.java
java -cp out rei.Main

✍ Writing ReiLang Code in Java

You can write ReiLang programs using:

String source = String.join("\n",
    "x = 10",
    "y = 5",
    "if x > y",
    "print x",
    "else",
    "print y"
);

Or, use Java 15+ text blocks:

String source = """
x = 10
y = 5
if x > y
print x
else
print y
""";

Then interpret:

ReiLexer lexer = new ReiLexer(source);
List<Token> tokens = lexer.tokenize();
ReiParser parser = new ReiParser(tokens);
List<Stmt> stmts = parser.parse();
ReiInterpreter interpreter = new ReiInterpreter();
for (Stmt stmt : stmts) {
    interpreter.execute(stmt);
}

🧠 Syntax & Examples

✅ Variable Assignment

x = 10
y = x + 5

🧮 Arithmetic

a = 5 + 3
b = 10 - 2
c = 4 * 6
d = 20 / 4

📤 Print Statements

x = 10
print x
print 42
print x + 5

🔁 Conditional Logic

If Statement

x = 10
y = 5
if x > y
print x

If-Else Statement

x = 3
y = 5
if x > y
print x
else
print y

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🔧 Project Structure

rei_lang/
├── rei/
│   ├── Expr.java
│   ├── Stmt.java
│   ├── ReiLexer.java
│   ├── ReiParser.java
│   ├── ReiInterpreter.java
│   ├── Token.java
│   └── TokenType.java
├── Main.java

🔮 Future Work

• Loops (while, for)
• User-defined functions
• Code blocks and indentation
• Strings and input/output

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👨‍💻 Author

Passionate about language design, compilers, and clean syntax, Naman developed ReiLang to explore how simple interpreted languages work under the hood — focusing on readability, expression parsing, and core logic constructs like arithmetic, variable assignments, printing, and conditional statements.

Contributions and suggestions are welcome!