LispOnZscript is an experiment, a programming exercise, and isn’t suitable for any practical purpose. I’ll be surprised if it finds any practical purpose.
Adapted from Lisp as the Maxwell’s equations of software by Michael Nielsen.
What can LispOnZscript do?
- evaluate arithmetic expressions,
- evaluate conditional expressions (`if` and `cond`),
- define local and global variables,
- define functions and evaluate them,
- call some ZScript functions.
Take a look at expression examples from internal tests:
Code: Select all
static tl_Test from()
{
let result = new("tl_Test");
// Expression, expected evaluation result.
result.add("0", "0");
result.add("1", "1");
result.add("(+ 1 2)", "3");
result.add("(+ (* 2 3) 4)", "10");
result.add("(quote 2)", "2");
result.add("(quote (+ 1 2))", "(+ 1 2)");
result.add("(atom? (+ 1 2))", "True");
result.add("(atom? (q (+ 1 2)))", "False");
result.add("(eq? 3 3)", "True");
result.add("(car (quote (1 2 3)))", "1");
result.add("(cdr (quote (1 2 3)))", "(2 3)");
result.add("(cons 1 (quote (2 3)))", "(1 2 3)");
result.add("(cond ((< 1 0) 2) ((< 0 1) 3))", "3");
result.add("(null? (quote ()))", "True");
result.add("(null? 2)", "False");
result.add("(if True 1 2)", "1");
result.add("(if False 1 2)", "2");
result.add("(begin 1 2 3)", "3");
result.add("(begin (set! abc 3) abc)", "3");
result.add("(begin (define abc 3) abc)", "3");
result.add("(begin (define square (lambda (x) (* x x))) (square 3))", "9");
result.add("(begin (define cube (lambda (x) (* x (* x x)))) (cube 2))", "8");
result.add("\"hello world\"", "\"hello world\"");
result.add("", "Error: unexpected EOF while reading.");
result.add("()", "Error: unexpected empty list.");
result.add("(", "Error: unmatched \"(\".");
result.add(")", "Error: unexpected \")\".");
result.add("(2)", "Error: \"2\" is not a function.");
result.add("(+ 1 2 3)",
"Error: TODO: add support for different number of parameters.");
result.add("player", "DoomPlayer");
result.add("(getCharacterName player)", "DoomPlayer");
result.add("(playerNumber player)", "0");
result.add("(isFrozen player)", "False");
result.add("(isFriend player player)", "True");
return result;
}
- Exposing ZScript class attributes. Only functions can be exposed now.
- More generic ZScript class functions exposing. At the moment their signatures must be hardcoded.
- Exposing ZScript structs. For example Cvar, vector. It can be done with wrapper classes, but it’s not fun.
- Exposing ZScript enums.