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(
(globals . (
(mac . [define mac
(litmac litfn () ((m . params) . body)
`(define ,m
(litmac litfn () ,params ,@body)))])
(def . [mac (def (name . params) . body)
`(define ,name (fn ,params ,@body))])
(do . [mac (do . body)
`((fn () ,@body))])
(let . [mac (let var val . body)
`((fn (,var) ,@body) ,val)])
(when . [mac (when cond . body)
`(if ,cond (do ,@body) ())])
(iflet . [mac (iflet var expr then else)
`(let ,var ,expr
(if ,var ,then ,else))])
(aif . [mac (aif expr then else)
`(iflet it ,expr ,then ,else)])
(forever . [mac (forever . body)
`(while 1 ,@body)])
(list . [def (list . args)
# we should probably make a copy here
args])
(ret . [mac (ret var val . body)
`(let ,var ,val ,@body ,var)])
(nth . [def (nth n xs)
if (n < 1)
(car xs)
(nth n-1 (cdr xs))])
(map1 . [def (map1 f xs)
if (no xs)
()
(cons (f (car xs))
(map1 f (cdr xs)))])
(compose . [def (compose f g)
(fn args
(f (apply g args)))])
(caar . [define caar (compose car car)])
(cadr . [define cadr (compose car cdr)])
(cddr . [define cddr (compose cdr cdr)])
(cdar . [define cdar (compose cdr car)])
(val . [define val cadr])
(some . [def (some f xs)
if (no xs)
()
if (f (car xs))
xs
(some f (cdr xs))])
(any . [define any some])
(all . [def (all f xs)
if (no xs)
1
if (f (car xs))
(all f (cdr xs))
()])
(find . [def (find x xs)
if (no xs)
()
if (x = (car xs))
1
(find x (cdr xs))])
(pair . [def (pair xs)
if (no xs)
()
if (no (cdr xs))
(list (list (car xs)))
(cons (list (car xs) (cadr xs))
(pair (cddr xs)))])
(with . [mac (with bindings . body)
`((fn ,(map1 car (pair bindings))
,@body)
,@(map1 cadr (pair bindings)))])
(afn . [mac (afn params . body)
`(let self ()
(set self (fn ,params ,@body)))])
(seq . [def (seq n)
((afn (i)
(if (i > n)
()
(cons i (self i+1))))
1)])
(each . [mac (each x xs . body)
`(walk ,xs (fn (,x) ,@body))])
(walk . [def (walk xs f)
when xs
(f (car xs))
(walk (cdr xs) f)])
(rem . [def (rem f xs)
if (no xs)
()
let rest (rem f (cdr xs))
if (f (car xs))
rest
(cons (car xs) rest)])
(keep . [def (keep f xs)
if (no xs)
()
let rest (keep f (cdr xs))
if (f (car xs))
(cons (car xs) rest)
rest])
(alist? . [def (alist? x)
(and (cons? x)
(cons? (car x)))])
(assoc . [def (assoc alist key)
if (no alist)
()
if (key = (caar alist))
(car alist)
(assoc (cdr alist) key)])
(get . [def (get alist key)
aif (assoc alist key)
(cdr it)
()])
(+= . [mac (var += inc)
`(set ,var (,var + ,inc))])
(++ . [mac (++ var)
`(+= ,var 1)])
(for . [mac (for var init test update . body)
`(let ,var ,init
(while ,test
,@body
,update))])
(repeat . [# Ideally we shouldn't have to provide
# var.
# But then nested repeats won't work
# until we use gensyms.
# And shell doesn't currently support
# gensyms.
# By exposing var to caller, it becomes
# caller's responsibility to use unique
# vars for each invocation of repeat.
mac (repeat var n . body)
`(for ,var 0 (,var < ,n) (++ ,var)
,@body)])
(grid . [def (grid m n val)
ret g (populate n ())
for i 0 (< i n) ++i
iset g i (populate m val)])
(indexgrid . [def (indexgrid g x y)
(index (index g y) x)])
(isetgrid . [def (isetgrid g x y val)
iset (index g y) x val])
(hborder . [def (hborder scr y color)
(hline scr y 0 (width scr) color)])
(vborder . [def (vborder scr x color)
(vline scr x 0 (height scr) color)])
(read_line . [def (read_line keyboard)
ret str (stream)
let c (key keyboard)
while (not (or (c = 0) (c = 10)))
(write str c)
(set c (key keyboard))])
(wait . [def (wait keyboard)
while (= 0 (key keyboard))
()])
(sq . [def (sq n) (n * n)])
(cube . [def (cube n) (n * n * n)])
(fill_rect . [def (fill_rect screen x1 y1 x2 y2 color)
for y y1 (y < y2) ++y
(hline screen y x1 x2 color)])
(ring . [def (ring screen cx cy r0 w clr)
for r r0 (r < r0+w) ++r
(circle screen cx cy r clr)])
(Greys . [define Greys
ret p (populate 16 ())
for i 0 (< i 16) ++i
iset p i i+16])
(Pinks . [define Pinks (array
84 85 59 60 61
13 36 37 5 108)])
(palette . [def (palette p i)
(index p (i % (len p)))])
(pat . [def (pat screen)
with (w (width screen)
h (height screen))
for y 0 (y < h) ++y
for x 0 (x < w) ++x
(pixel screen x y (palette Greys x*y))])
(main . [def (main screen keyboard)
(life screen)])
(liferes . [define liferes 8])
(life . [def (life screen)
with (w (/ (width screen) liferes)
h (/ (height screen) liferes))
with (g1 (grid w h 0)
g2 (grid w h 0))
isetgrid g1 w/2 h/2-1 1
isetgrid g1 w/2+1 h/2-1 1
isetgrid g1 w/2-1 h/2 1
isetgrid g1 w/2 h/2 1
isetgrid g1 w/2 h/2+1 1
renderlife screen g1
while 1
steplife g1 g2 screen
renderlife screen g2
steplife g2 g1 screen
renderlife screen g1])
(steplife . [def (steplife old new screen)
++lifetime
with (h (len old)
w (len (index old 0)))
for x 0 (< x w) ++x
for y 0 (< y h) ++y
fill_rect screen x*liferes y*liferes x+1*liferes y+1*liferes 0
with (curr (indexgrid old x y)
n (neighbors old x y w h)
)
isetgrid new x y (if (= n 2)
curr
(if (= n 3)
1
0))])
(renderlife . [def (renderlife screen g)
with (w (width screen)
h (height screen))
for y 0 (< y h) y+=liferes
for x 0 (< x w) x+=liferes
(fill_rect screen x y x+liferes y+liferes
(if (0 = (indexgrid g x/liferes y/liferes))
3
# (1 + lifetime%15)
0))])
(neighbors . [def (neighbors g x y w h)
ret result 0
when (y > 0)
when (x > 0)
result += (indexgrid g x-1 y-1)
result += (indexgrid g x y-1)
when (x < w-1)
result += (indexgrid g x+1 y-1)
when (x > 0)
result += (indexgrid g x-1 y)
when (x < w-1)
result += (indexgrid g x+1 y)
when (y < h-1)
when (x > 0)
result += (indexgrid g x-1 y+1)
result += (indexgrid g x y+1)
when (x < w-1)
result += (indexgrid g x+1 y+1)])
(lifetime . [define lifetime 0])
))
(sandbox . [life screen])
)
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