hasref / jlox

An interpreter for Lox in Java.

jlox

An interpreter for the Lox language, written in Java by following along with Bob Nystrom's "Crafting Interpreters".

Building

From the root folder, build using gradle ./gradlew build and launch using ./gradlew app:run -q --console=plain.

Implemented Challenges

While the book itself provides source code for the interpreter, this implementation adds the following suggested features/"challenges" from the book:

• Multiline C-style comments: /* */.
• Reverse Polish Notation Printer: (1 + 2) * (4 - 3) --> 1 2 + 4 3 - *
• C-style comma operator
• Ternary conditional (could be buggy)
• String + non-string converts non-string to string and performs string concatenation (e.g. 5 + "hello")
• Division by zero generates runtime error.
• Error productions for binary operator at the beginning of an expression.
• Error messages show location of error:

Error: Unexpected "," in argument list.

    15 | function(first, second,);
                               ^-- Here.

• Blobs of invalid characters produce a single error message.