4 (setq cadr (lambda (l) (car (cdr l))))
5 (setq caddr (lambda (l) (car (cdr (cdr l)))))
6 (setq list (lexpr (l) l))
8 ; evaluate a list of sexprs
10 ;(setq progn (lexpr (l) (last l)))
12 ; simple math operators
14 (setq 1+ (lambda (x) (+ x 1)))
15 (setq 1- (lambda (x) (- x 1)))
18 ; Define a variable without returning the value
19 ; Useful when defining functions to avoid
20 ; having lots of output generated
23 (setq def (macro (def-param)
41 ; define a set of local
42 ; variables and then evaluate
45 ; (let (var-defines) sexprs)
47 ; where var-defines are either
57 ; (let ((x 1) (y)) (setq y (+ x 1)) y)
59 (def let (macro (let-param)
60 ((lambda (vars exprs make-names make-exprs make-nils)
64 ; make the list of names in the let
67 (set 'make-names (lambda (vars)
69 (cons (car (car vars))
70 (make-names (cdr vars))))
75 ; the set of expressions is
76 ; the list of set expressions
78 ; expressions to evaluate
80 (set 'make-exprs (lambda (vars exprs)
89 (make-exprs (cdr vars) exprs)
97 (set 'exprs (make-exprs vars exprs))
100 ; the parameters to the lambda is a list
101 ; of nils of the right length
103 (set 'make-nils (lambda (vars)
104 (cond (vars (cons nil (make-nils (cdr vars))))
116 (cond ((cdr exprs) (cons 'progn exprs))
136 ; A slightly more convenient form
137 ; for defining lambdas.
139 ; (defun <name> (<params>) s-exprs)
142 (def defun (macro (defun-param)
143 (let ((name (car defun-param))
144 (args (cadr defun-param))
145 (exprs (cdr (cdr defun-param))))