about summary refs log tree commit diff stats
path: root/081print.mu
blob: fd5ed19610d7a0d9d2726d9390da71029fb1f2b1 (plain) (blame)
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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
# Wrappers around print primitives that take a 'screen' object and are thus
# easier to test.

container screen [
  num-rows:number
  num-columns:number
  cursor-row:number
  cursor-column:number
  data:address:array:screen-cell
]

container screen-cell [
  contents:character
  color:number
]

def new-fake-screen w:number, h:number -> result:address:screen [
  local-scope
  load-ingredients
  result <- new screen:type
  bufsize:number <- multiply w, h
  data:address:array:screen-cell <- new screen-cell:type, bufsize
  *result <- merge h/num-rows, w/num-columns, 0/cursor-row, 0/cursor-column, data
  result <- clear-screen result
]

def clear-screen screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists
  {
    break-unless screen
    # clear fake screen
    buf:address:array:screen-cell <- get *screen, data:offset
    max:number <- length *buf
    i:number <- copy 0
    {
      done?:boolean <- greater-or-equal i, max
      break-if done?
      curr:screen-cell <- merge 0/empty, 7/white
      *buf <- put-index *buf, i, curr
      i <- add i, 1
      loop
    }
    # reset cursor
    *screen <- put *screen, cursor-row:offset, 0
    *screen <- put *screen, cursor-column:offset, 0
    return
  }
  # otherwise, real screen
  clear-display
]

def sync-screen screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  {
    break-if screen
    sync-display
  }
  # do nothing for fake screens
]

def fake-screen-is-empty? screen:address:screen -> result:boolean [
  local-scope
  load-ingredients
  return-unless screen, 1/true
  buf:address:array:screen-cell <- get *screen, data:offset
  i:number <- copy 0
  len:number <- length *buf
  {
    done?:boolean <- greater-or-equal i, len
    break-if done?
    curr:screen-cell <- index *buf, i
    curr-contents:character <- get curr, contents:offset
    i <- add i, 1
    loop-unless curr-contents
    # not 0
    return 0/false
  }
  return 1/true
]

def print screen:address:screen, c:character -> screen:address:screen [
  local-scope
  load-ingredients
  color:number, color-found?:boolean <- next-ingredient
  {
    # default color to white
    break-if color-found?
    color <- copy 7/white
  }
  bg-color:number, bg-color-found?:boolean <- next-ingredient
  {
    # default bg-color to black
    break-if bg-color-found?
    bg-color <- copy 0/black
  }
  trace 90, [print-character], c
  {
    # if x exists
    # (handle special cases exactly like in the real screen)
    break-unless screen
    width:number <- get *screen, num-columns:offset
    height:number <- get *screen, num-rows:offset
    # if cursor is out of bounds, silently exit
    row:number <- get *screen, cursor-row:offset
    legal?:boolean <- greater-or-equal row, 0
    return-unless legal?
    legal? <- lesser-than row, height
    return-unless legal?
    column:number <- get *screen, cursor-column:offset
    legal? <- greater-or-equal column, 0
    return-unless legal?
    legal? <- lesser-than column, width
    return-unless legal?
#?     $print [print-character (], row, [, ], column, [): ], c, 10/newline
    # special-case: newline
    {
      newline?:boolean <- equal c, 10/newline
      break-unless newline?
      {
        # unless cursor is already at bottom
        bottom:number <- subtract height, 1
        at-bottom?:boolean <- greater-or-equal row, bottom
        break-if at-bottom?
        # move it to the next row
        column <- copy 0
        *screen <- put *screen, cursor-column:offset, column
        row <- add row, 1
        *screen <- put *screen, cursor-row:offset, row
      }
      return
    }
    # save character in fake screen
    index:number <- multiply row, width
    index <- add index, column
    buf:address:array:screen-cell <- get *screen, data:offset
    len:number <- length *buf
    # special-case: backspace
    {
      backspace?:boolean <- equal c, 8
      break-unless backspace?
      {
        # unless cursor is already at left margin
        at-left?:boolean <- lesser-or-equal column, 0
        break-if at-left?
        # clear previous location
        column <- subtract column, 1
        *screen <- put *screen, cursor-column:offset, column
        index <- subtract index, 1
        cursor:screen-cell <- merge 32/space, 7/white
        *buf <- put-index *buf, index, cursor
      }
      return
    }
    cursor:screen-cell <- merge c, color
    *buf <- put-index *buf, index, cursor
    # increment column unless it's already all the way to the right
    {
      right:number <- subtract width, 1
      at-right?:boolean <- greater-or-equal column, right
      break-if at-right?
      column <- add column, 1
      *screen <- put *screen, cursor-column:offset, column
    }
    return
  }
  # otherwise, real screen
  print-character-to-display c, color, bg-color
]

scenario print-character-at-top-left [
  run [
    1:address:screen <- new-fake-screen 3/width, 2/height
    11:character <- copy 97/a
    1:address:screen <- print 1:address:screen, 11:character/a
    2:address:array:screen-cell <- get *1:address:screen, data:offset
    3:array:screen-cell <- copy *2:address:array:screen-cell
  ]
  memory-should-contain [
    3 <- 6  # width*height
    4 <- 97  # 'a'
    5 <- 7  # white
    6 <- 0
  ]
]

scenario print-character-in-color [
  run [
    1:address:screen <- new-fake-screen 3/width, 2/height
    11:character <- copy 97/a
    1:address:screen <- print 1:address:screen, 11:character/a, 1/red
    2:address:array:screen-cell <- get *1:address:screen, data:offset
    3:array:screen-cell <- copy *2:address:array:screen-cell
  ]
  memory-should-contain [
    3 <- 6  # width*height
    4 <- 97  # 'a'
    5 <- 1  # red
    6 <- 0
  ]
]

scenario print-backspace-character [
  run [
    1:address:screen <- new-fake-screen 3/width, 2/height
    11:character <- copy 97/a
    1:address:screen <- print 1:address:screen, 11:character/a
    12:character <- copy 8/backspace
    1:address:screen <- print 1:address:screen, 12:character/backspace
    2:number <- get *1:address:screen, cursor-column:offset
    3:address:array:screen-cell <- get *1:address:screen, data:offset
    4:array:screen-cell <- copy *3:address:array:screen-cell
  ]
  memory-should-contain [
    2 <- 0  # cursor column
    4 <- 6  # width*height
    5 <- 32  # space, not 'a'
    6 <- 7  # white
    7 <- 0
  ]
]

scenario print-extra-backspace-character [
  run [
    1:address:screen <- new-fake-screen 3/width, 2/height
    11:character <- copy 97/a
    1:address:screen <- print 1:address:screen, 11:character/a
    12:character <- copy 8/backspace
    1:address:screen <- print 1:address:screen, 12:character/backspace
    12:character <- copy 8/backspace
    1:address:screen <- print 1:address:screen, 12:character/backspace
    2:number <- get *1:address:screen, cursor-column:offset
    3:address:array:screen-cell <- get *1:address:screen, data:offset
    4:array:screen-cell <- copy *3:address:array:screen-cell
  ]
  memory-should-contain [
    2 <- 0  # cursor column
    4 <- 6  # width*height
    5 <- 32  # space, not 'a'
    6 <- 7  # white
    7 <- 0
  ]
]

scenario print-character-at-right-margin [
  run [
    1:address:screen <- new-fake-screen 2/width, 2/height
    11:character <- copy 97/a
    1:address:screen <- print 1:address:screen, 11:character/a
    12:character <- copy 98/b
    1:address:screen <- print 1:address:screen, 12:character/b
    13:character <- copy 99/b
    1:address:screen <- print 1:address:screen, 13:character/c
    2:number <- get *1:address:screen, cursor-column:offset
    3:address:array:screen-cell <- get *1:address:screen, data:offset
    4:array:screen-cell <- copy *3:address:array:screen-cell
  ]
  memory-should-contain [
    2 <- 1  # cursor column
    4 <- 4  # width*height
    5 <- 97  # 'a'
    6 <- 7  # white
    7 <- 99  # 'c' over 'b'
    8 <- 7  # white
    9 <- 0
  ]
]

scenario print-newline-character [
  run [
    1:address:screen <- new-fake-screen 3/width, 2/height
    10:character <- copy 10/newline
    11:character <- copy 97/a
    1:address:screen <- print 1:address:screen, 11:character/a
    1:address:screen <- print 1:address:screen, 10:character/newline
    2:number <- get *1:address:screen, cursor-row:offset
    3:number <- get *1:address:screen, cursor-column:offset
    4:address:array:screen-cell <- get *1:address:screen, data:offset
    5:array:screen-cell <- copy *4:address:array:screen-cell
  ]
  memory-should-contain [
    2 <- 1  # cursor row
    3 <- 0  # cursor column
    5 <- 6  # width*height
    6 <- 97  # 'a'
    7 <- 7  # white
    8 <- 0
  ]
]

scenario print-newline-at-bottom-line [
  run [
    1:address:screen <- new-fake-screen 3/width, 2/height
    10:character <- copy 10/newline
    1:address:screen <- print 1:address:screen, 10:character/newline
    1:address:screen <- print 1:address:screen, 10:character/newline
    1:address:screen <- print 1:address:screen, 10:character/newline
    2:number <- get *1:address:screen, cursor-row:offset
    3:number <- get *1:address:screen, cursor-column:offset
  ]
  memory-should-contain [
    2 <- 1  # cursor row
    3 <- 0  # cursor column
  ]
]

scenario print-character-at-bottom-right [
  run [
    1:address:screen <- new-fake-screen 2/width, 2/height
    10:character <- copy 10/newline
    1:address:screen <- print 1:address:screen, 10:character/newline
    11:character <- copy 97/a
    1:address:screen <- print 1:address:screen, 11:character/a
    12:character <- copy 98/b
    1:address:screen <- print 1:address:screen, 12:character/b
    13:character <- copy 99/c
    1:address:screen <- print 1:address:screen, 13:character/c
    1:address:screen <- print 1:address:screen, 10:character/newline
    14:character <- copy 100/d
    1:address:screen <- print 1:address:screen, 14:character/d
    2:number <- get *1:address:screen, cursor-row:offset
    3:number <- get *1:address:screen, cursor-column:offset
    4:address:array:screen-cell <- get *1:address:screen, data:offset
    20:array:screen-cell <- copy *4:address:array:screen-cell
  ]
  memory-should-contain [
    2 <- 1  # cursor row
    3 <- 1  # cursor column
    20 <- 4  # width*height
    21 <- 0  # unused
    22 <- 7  # white
    23 <- 0  # unused
    24 <- 7  # white
    25 <- 97 # 'a'
    26 <- 7  # white
    27 <- 100  # 'd' over 'b' and 'c' and newline
    28 <- 7  # white
    29 <- 0
  ]
]

def clear-line screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  space:character <- copy 0/nul
  # if x exists, clear line in fake screen
  {
    break-unless screen
    width:number <- get *screen, num-columns:offset
    column:number <- get *screen, cursor-column:offset
    original-column:number <- copy column
    # space over the entire line
    {
      right:number <- subtract width, 1
      done?:boolean <- greater-or-equal column, right
      break-if done?
      print screen, space
      column <- add column, 1
      loop
    }
    # now back to where the cursor was
    *screen <- put *screen, cursor-column:offset, original-column
    return
  }
  # otherwise, real screen
  clear-line-on-display
]

def cursor-position screen:address:screen -> row:number, column:number [
  local-scope
  load-ingredients
  # if x exists, lookup cursor in fake screen
  {
    break-unless screen
    row:number <- get *screen, cursor-row:offset
    column:number <- get *screen, cursor-column:offset
    return
  }
  row, column <- cursor-position-on-display
]

def move-cursor screen:address:screen, new-row:number, new-column:number -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists, move cursor in fake screen
  {
    break-unless screen
    *screen <- put *screen, cursor-row:offset, new-row
    *screen <- put *screen, cursor-column:offset, new-column
    return
  }
  # otherwise, real screen
  move-cursor-on-display new-row, new-column
]

scenario clear-line-erases-printed-characters [
  run [
    1:address:screen <- new-fake-screen 3/width, 2/height
    # print a character
    10:character <- copy 97/a
    1:address:screen <- print 1:address:screen, 10:character/a
    # move cursor to start of line
    1:address:screen <- move-cursor 1:address:screen, 0/row, 0/column
    # clear line
    1:address:screen <- clear-line 1:address:screen
    2:address:array:screen-cell <- get *1:address:screen, data:offset
    20:array:screen-cell <- copy *2:address:array:screen-cell
  ]
  # screen should be blank
  memory-should-contain [
    20 <- 6  # width*height
    21 <- 0
    22 <- 7
    23 <- 0
    24 <- 7
    25 <- 0
    26 <- 7
    27 <- 0
    28 <- 7
    29 <- 0
    30 <- 7
    31 <- 0
    32 <- 7
  ]
]

def cursor-down screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists, move cursor in fake screen
  {
    break-unless screen
    {
      # increment row unless it's already all the way down
      height:number <- get *screen, num-rows:offset
      row:number <- get *screen, cursor-row:offset
      max:number <- subtract height, 1
      at-bottom?:boolean <- greater-or-equal row, max
      break-if at-bottom?
      row <- add row, 1
      *screen <- put *screen, cursor-row:offset, row
    }
    return
  }
  # otherwise, real screen
  move-cursor-down-on-display
]

def cursor-up screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists, move cursor in fake screen
  {
    break-unless screen
    {
      # decrement row unless it's already all the way up
      row:number <- get *screen, cursor-row:offset
      at-top?:boolean <- lesser-or-equal row, 0
      break-if at-top?
      row <- subtract row, 1
      *screen <- put *screen, cursor-row:offset, row
    }
    return
  }
  # otherwise, real screen
  move-cursor-up-on-display
]

def cursor-right screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists, move cursor in fake screen
  {
    break-unless screen
    {
      # increment column unless it's already all the way to the right
      width:number <- get *screen, num-columns:offset
      column:number <- get *screen, cursor-column:offset
      max:number <- subtract width, 1
      at-bottom?:boolean <- greater-or-equal column, max
      break-if at-bottom?
      column <- add column, 1
      *screen <- put *screen, cursor-column:offset, column
    }
    return
  }
  # otherwise, real screen
  move-cursor-right-on-display
]

def cursor-left screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists, move cursor in fake screen
  {
    break-unless screen
    {
      # decrement column unless it's already all the way to the left
      column:number <- get *screen, cursor-column:offset
      at-top?:boolean <- lesser-or-equal column, 0
      break-if at-top?
      column <- subtract column, 1
      *screen <- put *screen, cursor-column:offset, column
    }
    return
  }
  # otherwise, real screen
  move-cursor-left-on-display
]

def cursor-to-start-of-line screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  row:number <- cursor-position screen
  column:number <- copy 0
  screen <- move-cursor screen, row, column
]

def cursor-to-next-line screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  screen <- cursor-down screen
  screen <- cursor-to-start-of-line screen
]

def screen-width screen:address:screen -> width:number [
  local-scope
  load-ingredients
  # if x exists, move cursor in fake screen
  {
    break-unless screen
    width <- get *screen, num-columns:offset
    return
  }
  # otherwise, real screen
  width <- display-width
]

def screen-height screen:address:screen -> height:number [
  local-scope
  load-ingredients
  # if x exists, move cursor in fake screen
  {
    break-unless screen
    height <- get *screen, num-rows:offset
    return
  }
  # otherwise, real screen
  height <- display-height
]

def hide-cursor screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists (not real display), do nothing
  {
    break-unless screen
    return
  }
  # otherwise, real screen
  hide-cursor-on-display
]

def show-cursor screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists (not real display), do nothing
  {
    break-unless screen
    return
  }
  # otherwise, real screen
  show-cursor-on-display
]

def hide-screen screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists (not real display), do nothing
  # todo: help test this
  {
    break-unless screen
    return
  }
  # otherwise, real screen
  hide-display
]

def show-screen screen:address:screen -> screen:address:screen [
  local-scope
  load-ingredients
  # if x exists (not real display), do nothing
  # todo: help test this
  {
    break-unless screen
    return
  }
  # otherwise, real screen
  show-display
]

def print screen:address:screen, s:address:array:character -> screen:address:screen [
  local-scope
  load-ingredients
  color:number, color-found?:boolean <- next-ingredient
  {
    # default color to white
    break-if color-found?
    color <- copy 7/white
  }
  bg-color:number, bg-color-found?:boolean <- next-ingredient
  {
    # default bg-color to black
    break-if bg-color-found?
    bg-color <- copy 0/black
  }
  len:number <- length *s
  i:number <- copy 0
  {
    done?:boolean <- greater-or-equal i, len
    break-if done?
    c:character <- index *s, i
    print screen, c, color, bg-color
    i <- add i, 1
    loop
  }
]

scenario print-text-stops-at-right-margin [
  run [
    1:address:screen <- new-fake-screen 3/width, 2/height
    2:address:array:character <- new [abcd]
    1:address:screen <- print 1:address:screen, 2:address:array:character
    3:address:array:screen-cell <- get *1:address:screen, data:offset
    4:array:screen-cell <- copy *3:address:array:screen-cell
  ]
  memory-should-contain [
    4 <- 6  # width*height
    5 <- 97  # 'a'
    6 <- 7  # white
    7 <- 98  # 'b'
    8 <- 7  # white
    9 <- 100  # 'd' overwrites 'c'
    10 <- 7  # white
    11 <- 0  # unused
  ]
]

def print-integer screen:address:screen, n:number -> screen:address:screen [
  local-scope
  load-ingredients
  color:number, color-found?:boolean <- next-ingredient
  {
    # default color to white
    break-if color-found?
    color <- copy 7/white
  }
  bg-color:number, bg-color-found?:boolean <- next-ingredient
  {
    # default bg-color to black
    break-if bg-color-found?
    bg-color <- copy 0/black
  }
  # todo: other bases besides decimal
  s:address:array:character <- to-text n
  screen <- print screen, s, color, bg-color
]

# for now, we can only print integers
def print screen:address:screen, n:number -> screen:address:screen [
  local-scope
  load-ingredients
  color:number, color-found?:boolean <- next-ingredient
  {
    # default color to white
    break-if color-found?
    color <- copy 7/white
  }
  bg-color:number, bg-color-found?:boolean <- next-ingredient
  {
    # default bg-color to black
    break-if bg-color-found?
    bg-color <- copy 0/black
  }
  screen <- print-integer screen, n, color, bg-color
]

# addresses
def print screen:address:screen, n:address:_elem -> screen:address:screen [
  local-scope
  load-ingredients
  color:number, color-found?:boolean <- next-ingredient
  {
    # default color to white
    break-if color-found?
    color <- copy 7/white
  }
  bg-color:number, bg-color-found?:boolean <- next-ingredient
  {
    # default bg-color to black
    break-if bg-color-found?
    bg-color <- copy 0/black
  }
  n2:number <- copy n
  screen <- print-integer screen, n2, color, bg-color
]