An interpreter for Lox programming language, based on the book Crafting Interpreters by Robert Nystrom.

Features

• Tokens: Tokenization and lexical analysis.
• Parser: Recursive descent parsing.
• AST: Abstract Syntax Tree representation.
• Interpreter: Executes Lox code in a tree-walk interpreter.
• Expressions: Arithmetic, logical, comparison, and grouping expressions.
• Statements: Print, expression, and variable declarations.
• Variables: Global and local variable scopes.
• Control Flow: if, else, while, and for loops.
• Functions: Define and call reusable functions with local scope.
• Error Reporting: Syntax and runtime error detection with helpful messages.

Sample Code in Lox

// Variables and print statements
var x = 10;
var y = 20;
print x + y; // Output: 30

// Conditional
if (x < y) {
  print "x is less than y";
} else {
  print "x is greater than or equal to y";
}

// While loop
var count = 3;
while (count > 0) {
  print count;
  count = count - 1;
}

// For loop
for (var i = 0; i < 5; i = i + 1) {
  print i;
}

// Function definition and call
fun greet(name) {
  print "Hello, " + name + "!";
}
greet("Lox"); // Output: Hello, Lox!

// Function with return value
fun add(a, b) {
  return a + b;
}
print add(5, 7); // Output: 12