dlox

An implementation of the Lox programming language in Dart.

This implementation used Crafting Interpreters as a guide.

It includes a couple of features from the end of chapter challenges:

1. Ternary operator (?) print ? true "true" : "false;
2. Read builtin

// Declare variable and read into it
var a;
read a;

// Or declare and assign in one step
read var a;

3. Lambda functions

fun thrice(fn) {
 for (var i = 1; i <= 3; i = i + 1) {
   fn(i);
 }
}

thrice(fun (a) {
 print a;
});
// "1".
// "2".
// "3".

Usage

To enter a REPL simply run

dart run                                                                     
Building package executable... 
Built dlox:dlox.
> 
print "Hello World";
Hello World
>                                                           

Execute a file

dart run bin/dlox.dart run test/test_cases/hello_world.dlox
Hello World

Format a file and print to stdout

dart run bin/dlox.dart format test/test_cases/hello_world.dlox
print "Hello World";

Powers the Dlotter project