1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
(
(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)])
(list . [def (list . args)
# we should probably make a copy here
args])
(ret . [mac (ret var val . body)
`(let ,var ,val ,@body ,var)])
(len . [def (len l)
if (no l)
0
(1 + (len (cdr l)))])
(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)])
(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])
(++ . [mac (++ var) `(set ,var (,var + 1))])
(+= . [mac (var += inc)
`(set ,var (,var + ,inc))])
(for . [mac (for var init test update . body)
`(let ,var ,init
(while ,test
,@body
,update))])
(hline1 . [def (hline1 screen y x xmax color)
while (x < xmax)
(pixel screen x y color)
++x])
(vline1 . [def (vline1 screen x y ymax color)
while (y < ymax)
(pixel screen x y color)
++y])
(hline . [def (hline scr y color)
(hline1 scr y 0 (width scr) color)])
(vline . [def (vline scr x color)
(vline1 scr x 0 (height scr) color)])
(line . [def (line screen x0 y0 x1 y1 color)
with (x x0
y y0
dx (abs x1-x0)
dy (0 - (abs y1-y0))
sx (sgn x1-x0)
sy (sgn y1-y0))
let err dx+dy
while (not (and (x = x1)
(y = y1)))
(pixel screen x y color)
let e2 err*2
when (e2 >= dy)
x += sx
when (e2 <= dx)
y += sy
err +=
(+ (if (e2 >= dy)
dy
0)
(if (e2 <= dx)
dx
0))])
(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
(hline1 screen y x1 x2 color)])
(circle . [def (circle scr cx cy r clr)
with (x (0 - r)
y 0
err (2 - r*2)
continue 1)
while continue
(pixel scr cx-x cy+y clr)
(pixel scr cx-y cy-x clr)
(pixel scr cx+x cy-y clr)
(pixel scr cx+y cy+x clr)
(set r err)
when (r <= y)
++y
err += (y*2 + 1)
when (or (r > x) (err > y))
++x
err += (x*2 + 1)
set continue (x < 0)])
(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
(map1 (fn(n) (n + 15))
(seq 16))])
(Pinks . [define Pinks '(84 85 59 60 61
13 36 37 5 108)])
(palette . [def (palette p i)
(nth (i % (len p)) 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 x*y)])
(main . [def (main screen keyboard)
(pat screen)])
))
(sandbox . [circle screen 35 35 14 3])
)
|