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Lemon

Lemon is a simple Lisp whose sole purpose is to be a self hosted language.

Primatives

List of primatives includes:

  • Numbers (ints and floats)
  • Characters ('a')
  • Numeric operations (+, -, *, /, mod, &, |, ^, <<, >>)
  • bind, bindl, bindr, func
  • cond, eval
  • ==, <, >, <=, >=, !=, int?, float?, func?, char?
  • int, float, char conversion functions

Strings

"abc" is syntax sugar for (list 'a' 'b' 'c' 0)

Bind and Func

The bind functions and the func functions do not require parentheses for their last argument. The following is valid:

(bind 'true func 'a func 'b a)
(bind 'false func 'a func 'b b)
(bind 'cons func 'a func 'b func 'f f a b)
(bind 'car func 'list list true)
(bind 'cdr func 'list list false)

Bindr and Bindl

The bindr and bindl functions let you define variable argument functions. Here is an example:

(bindr 'list cons)

This means that the following two lines are equivalent:

(list 1 2 3 4 5 0)
(list 1 (list 2 (list 3 (list 4 (list 5 0)))))