about summary refs log tree commit diff stats
path: root/linux/tile/word.mu
blob: ba4877fa31d152132877d57fa03f5e88d3ef7749 (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
fn initialize-word _self: (addr word) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  allocate data-ah
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  initialize-gap-buffer data
}

## some helpers for creating words. mostly for tests

fn initialize-word-with _self: (addr word), s: (addr array byte) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  allocate data-ah
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  initialize-gap-buffer-with data, s
}

fn allocate-word-with _out: (addr handle word), s: (addr array byte) {
  var out/eax: (addr handle word) <- copy _out
  allocate out
  var out-addr/eax: (addr word) <- lookup *out
  initialize-word-with out-addr, s
}

# just for tests for now
# TODO: handle existing next
# one implication of handles: append must take a handle
fn append-word-with self-h: (handle word), s: (addr array byte) {
  var self/eax: (addr word) <- lookup self-h
  var next-ah/eax: (addr handle word) <- get self, next
  allocate-word-with next-ah, s
  var next/eax: (addr word) <- lookup *next-ah
  var prev-ah/eax: (addr handle word) <- get next, prev
  copy-handle self-h, prev-ah
}

# just for tests for now
# TODO: handle existing prev
fn prepend-word-with self-h: (handle word), s: (addr array byte) {
  var self/eax: (addr word) <- lookup self-h
  var prev-ah/eax: (addr handle word) <- get self, prev
  allocate-word-with prev-ah, s
  var prev/eax: (addr word) <- lookup *prev-ah
  var next-ah/eax: (addr handle word) <- get prev, next
  copy-handle self-h, next-ah
}

## real primitives

fn move-word-contents _src-ah: (addr handle word), _dest-ah: (addr handle word) {
  var dest-ah/eax: (addr handle word) <- copy _dest-ah
  var _dest/eax: (addr word) <- lookup *dest-ah
  var dest/edi: (addr word) <- copy _dest
  var src-ah/eax: (addr handle word) <- copy _src-ah
  var _src/eax: (addr word) <- lookup *src-ah
  var src/esi: (addr word) <- copy _src
  cursor-to-start src
  var src-data-ah/eax: (addr handle gap-buffer) <- get src, scalar-data
  var src-data/eax: (addr gap-buffer) <- lookup *src-data-ah
  var src-stack/ecx: (addr grapheme-stack) <- get src-data, right
  {
    var done?/eax: boolean <- grapheme-stack-empty? src-stack
    compare done?, 0/false
    break-if-!=
    var g/eax: code-point-utf8 <- pop-grapheme-stack src-stack
#?     print-code-point-utf8 0, g
#?     print-string 0, "\n"
    add-code-point-utf8-to-word dest, g
    loop
  }
}

fn copy-word-contents-before-cursor _src-ah: (addr handle word), _dest-ah: (addr handle word) {
  var dest-ah/eax: (addr handle word) <- copy _dest-ah
  var _dest/eax: (addr word) <- lookup *dest-ah
  var dest/edi: (addr word) <- copy _dest
  var src-ah/eax: (addr handle word) <- copy _src-ah
  var src/eax: (addr word) <- lookup *src-ah
  var src-data-ah/eax: (addr handle gap-buffer) <- get src, scalar-data
  var src-data/eax: (addr gap-buffer) <- lookup *src-data-ah
  var src-stack/ecx: (addr grapheme-stack) <- get src-data, left
  var src-stack-data-ah/eax: (addr handle array code-point-utf8) <- get src-stack, data
  var _src-stack-data/eax: (addr array code-point-utf8) <- lookup *src-stack-data-ah
  var src-stack-data/edx: (addr array code-point-utf8) <- copy _src-stack-data
  var top-addr/ecx: (addr int) <- get src-stack, top
  var i/eax: int <- copy 0
  {
    compare i, *top-addr
    break-if->=
    var g/edx: (addr code-point-utf8) <- index src-stack-data, i
    add-code-point-utf8-to-word dest, *g
    i <- increment
    loop
  }
}

fn word-equal? _self: (addr word), s: (addr array byte) -> _/eax: boolean {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var result/eax: boolean <- gap-buffer-equal? data, s
  return result
}

fn word-length _self: (addr word) -> _/eax: int {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var result/eax: int <- gap-buffer-length data
  return result
}

fn final-word _in: (addr handle word), out: (addr handle word) {
  var curr-h: (handle word)
  var curr-ah/esi: (addr handle word) <- address curr-h
  copy-object _in, curr-ah
  var curr/eax: (addr word) <- copy 0
  var next/edi: (addr handle word) <- copy 0
  {
    curr <- lookup *curr-ah
    next <- get curr, next
    curr <- lookup *next
    compare curr, 0
    break-if-=
    copy-object next, curr-ah
    loop
  }
  copy-object curr-ah, out  # modify 'out' right at the end, just in case it's same as 'in'
}

fn first-code-point-utf8 _self: (addr word) -> _/eax: code-point-utf8 {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var result/eax: code-point-utf8 <- first-code-point-utf8-in-gap-buffer data
  return result
}

fn code-point-utf8-before-cursor _self: (addr word) -> _/eax: code-point-utf8 {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var result/eax: code-point-utf8 <- code-point-utf8-before-cursor-in-gap-buffer data
  return result
}

fn add-code-point-utf8-to-word _self: (addr word), c: code-point-utf8 {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  add-code-point-utf8-at-gap data, c
}

fn cursor-at-start? _self: (addr word) -> _/eax: boolean {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var result/eax: boolean <- gap-at-start? data
  return result
}

fn cursor-at-end? _self: (addr word) -> _/eax: boolean {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var result/eax: boolean <- gap-at-end? data
  return result
}

fn cursor-left _self: (addr word) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var dummy/eax: code-point-utf8 <- gap-left data
}

fn cursor-right _self: (addr word) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var dummy/eax: code-point-utf8 <- gap-right data
}

fn cursor-to-start _self: (addr word) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  gap-to-start data
}

fn cursor-to-end _self: (addr word) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  gap-to-end data
}

fn cursor-index _self: (addr word) -> _/eax: int {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var result/eax: int <- gap-index data
  return result
}

fn delete-before-cursor _self: (addr word) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  delete-before-gap data
}

fn pop-after-cursor _self: (addr word) -> _/eax: code-point-utf8 {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var result/eax: code-point-utf8 <- pop-after-gap data
  return result
}

fn delete-next _self: (addr word) {
  var self/esi: (addr word) <- copy _self
  var next-ah/edi: (addr handle word) <- get self, next
  var next/eax: (addr word) <- lookup *next-ah
  compare next, 0
  break-if-=
  var next-next-ah/ecx: (addr handle word) <- get next, next
  var self-ah/esi: (addr handle word) <- get next, prev
  copy-object next-next-ah, next-ah
  var new-next/eax: (addr word) <- lookup *next-next-ah
  compare new-next, 0
  break-if-=
  var dest/eax: (addr handle word) <- get new-next, prev
  copy-object self-ah, dest
}

fn print-word screen: (addr screen), _self: (addr word) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  render-gap-buffer screen, data
}

fn print-words-in-reverse screen: (addr screen), _words-ah: (addr handle word) {
  var words-ah/eax: (addr handle word) <- copy _words-ah
  var words-a/eax: (addr word) <- lookup *words-ah
  compare words-a, 0
  break-if-=
  # recurse
  var next-ah/ecx: (addr handle word) <- get words-a, next
  print-words-in-reverse screen, next-ah
  # print
  print-word screen, words-a
  print-string screen, " "
}

# Gotcha with some word operations: ensure dest-ah isn't in the middle of some
# existing chain of words. There are two pointers to patch, and you'll forget
# to do the other one.
fn copy-words _src-ah: (addr handle word), _dest-ah: (addr handle word) {
  var src-ah/eax: (addr handle word) <- copy _src-ah
  var src-a/eax: (addr word) <- lookup *src-ah
  compare src-a, 0
  break-if-=
  # copy
  var dest-ah/edi: (addr handle word) <- copy _dest-ah
  copy-word src-a, dest-ah
  # recurse
  var rest: (handle word)
  var rest-ah/ecx: (addr handle word) <- address rest
  var next-src-ah/esi: (addr handle word) <- get src-a, next
  copy-words next-src-ah, rest-ah
  chain-words dest-ah, rest-ah
}

fn copy-words-in-reverse _src-ah: (addr handle word), _dest-ah: (addr handle word) {
  var src-ah/eax: (addr handle word) <- copy _src-ah
  var _src-a/eax: (addr word) <- lookup *src-ah
  var src-a/esi: (addr word) <- copy _src-a
  compare src-a, 0
  break-if-=
  # recurse
  var next-src-ah/ecx: (addr handle word) <- get src-a, next
  var dest-ah/edi: (addr handle word) <- copy _dest-ah
  copy-words-in-reverse next-src-ah, dest-ah
  #
  copy-word-at-end src-a, dest-ah
}

fn copy-word-at-end src: (addr word), _dest-ah: (addr handle word) {
  var dest-ah/edi: (addr handle word) <- copy _dest-ah
  # if dest is null, copy and return
  var dest-a/eax: (addr word) <- lookup *dest-ah
  compare dest-a, 0
  {
    break-if-!=
    copy-word src, dest-ah
    return
  }
  # copy current word
  var new: (handle word)
  var new-ah/ecx: (addr handle word) <- address new
  copy-word src, new-ah
  # append it at the end
  var curr-ah/edi: (addr handle word) <- copy dest-ah
  {
    var curr-a/eax: (addr word) <- lookup *curr-ah  # curr-a guaranteed not to be null
    var next-ah/ecx: (addr handle word) <- get curr-a, next
    var next-a/eax: (addr word) <- lookup *next-ah
    compare next-a, 0
    break-if-=
    curr-ah <- copy next-ah
    loop
  }
  chain-words curr-ah, new-ah
}

fn append-word-at-end-with _dest-ah: (addr handle word), s: (addr array byte) {
  var dest-ah/edi: (addr handle word) <- copy _dest-ah
  # if dest is null, copy and return
  var dest-a/eax: (addr word) <- lookup *dest-ah
  compare dest-a, 0
  {
    break-if-!=
    allocate-word-with dest-ah, s
    return
  }
  # otherwise append at end
  var curr-ah/edi: (addr handle word) <- copy dest-ah
  {
    var curr-a/eax: (addr word) <- lookup *curr-ah  # curr-a guaranteed not to be null
    var next-ah/ecx: (addr handle word) <- get curr-a, next
    var next-a/eax: (addr word) <- lookup *next-ah
    compare next-a, 0
    break-if-=
    curr-ah <- copy next-ah
    loop
  }
  append-word-with *curr-ah, s
}

fn copy-word _src-a: (addr word), _dest-ah: (addr handle word) {
  var dest-ah/eax: (addr handle word) <- copy _dest-ah
  allocate dest-ah
  var _dest-a/eax: (addr word) <- lookup *dest-ah
  var dest-a/eax: (addr word) <- copy _dest-a
  initialize-word dest-a
  var dest/edi: (addr handle gap-buffer) <- get dest-a, scalar-data
  var src-a/eax: (addr word) <- copy _src-a
  var src/eax: (addr handle gap-buffer) <- get src-a, scalar-data
  copy-gap-buffer src, dest
}

# one implication of handles: append must take a handle
fn append-word _self-ah: (addr handle word) {
  var saved-self-storage: (handle word)
  var saved-self/eax: (addr handle word) <- address saved-self-storage
  copy-object _self-ah, saved-self
#?   {
#?     print-string 0, "self-ah is "
#?     var foo/eax: int <- copy _self-ah
#?     print-int32-hex 0, foo
#?     print-string 0, "\n"
#?   }
  var self-ah/esi: (addr handle word) <- copy _self-ah
  var _self/eax: (addr word) <- lookup *self-ah
  var self/ebx: (addr word) <- copy _self
#?   {
#?     print-string 0, "0: self is "
#?     var self-ah/eax: (addr handle word) <- copy _self-ah
#?     var self/eax: (addr word) <- lookup *self-ah
#?     var foo/eax: int <- copy self
#?     print-int32-hex 0, foo
#?     print-string 0, "\n"
#?   }
  # allocate new handle
  var new: (handle word)
  var new-ah/ecx: (addr handle word) <- address new
  allocate new-ah
  var new-addr/eax: (addr word) <- lookup new
  initialize-word new-addr
#?   {
#?     print-string 0, "new is "
#?     var foo/eax: int <- copy new-addr
#?     print-int32-hex 0, foo
#?     print-string 0, "\n"
#?   }
  # new->next = self->next
  var src/esi: (addr handle word) <- get self, next
#?   {
#?     print-string 0, "src is "
#?     var foo/eax: int <- copy src
#?     print-int32-hex 0, foo
#?     print-string 0, "\n"
#?   }
  var dest/edi: (addr handle word) <- get new-addr, next
  copy-object src, dest
  # new->next->prev = new
  {
    var next-addr/eax: (addr word) <- lookup *src
    compare next-addr, 0
    break-if-=
#?     {
#?       print-string 0, "next-addr is "
#?       var foo/eax: int <- copy next-addr
#?       print-int32-hex 0, foo
#?       print-string 0, "\n"
#?     }
    dest <- get next-addr, prev
#? #?     {
#? #?       print-string 0, "self-ah is "
#? #?       var foo/eax: int <- copy _self-ah
#? #?       print-int32-hex 0, foo
#? #?       print-string 0, "\n"
#? #?       print-string 0, "2: self is "
#? #?       var self-ah/eax: (addr handle word) <- copy _self-ah
#? #?       var self/eax: (addr word) <- lookup *self-ah
#? #?       var foo/eax: int <- copy self
#? #?       print-int32-hex 0, foo
#? #?       print-string 0, "\n"
#? #?     }
#?     {
#?       print-string 0, "copying new to "
#?       var foo/eax: int <- copy dest
#?       print-int32-hex 0, foo
#?       print-string 0, "\n"
#?     }
    copy-object new-ah, dest
#?     {
#?       print-string 0, "4: self is "
#?       var self-ah/eax: (addr handle word) <- copy _self-ah
#?       var self/eax: (addr word) <- lookup *self-ah
#?       var foo/eax: int <- copy self
#?       print-int32-hex 0, foo
#?       print-string 0, "\n"
#?     }
  }
  # new->prev = saved-self
  dest <- get new-addr, prev
#?   {
#?     print-string 0, "copying "
#?     var self-ah/esi: (addr handle word) <- copy _self-ah
#?     var self/eax: (addr word) <- lookup *self-ah
#?     var foo/eax: int <- copy self
#?     print-int32-hex 0, foo
#?     print-string 0, " to "
#?     foo <- copy dest
#?     print-int32-hex 0, foo
#?     print-string 0, "\n"
#?   }
  var saved-self-ah/eax: (addr handle word) <- address saved-self-storage
  copy-object saved-self-ah, dest
  # self->next = new
  dest <- get self, next
  copy-object new-ah, dest
}

fn chain-words _self-ah: (addr handle word), _next: (addr handle word) {
  var self-ah/esi: (addr handle word) <- copy _self-ah
  var _self/eax: (addr word) <- lookup *self-ah
  var self/ecx: (addr word) <- copy _self
  var dest/edx: (addr handle word) <- get self, next
  var next-ah/edi: (addr handle word) <- copy _next
  copy-object next-ah, dest
  var next/eax: (addr word) <- lookup *next-ah
  compare next, 0
  break-if-=
  dest <- get next, prev
  copy-object self-ah, dest
}

fn emit-word _self: (addr word), out: (addr stream byte) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  emit-gap-buffer data, out
}

fn word-to-string _self: (addr word), out: (addr handle array byte) {
  var self/esi: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  gap-buffer-to-string data, out
}

fn word-is-decimal-integer? _self: (addr word) -> _/eax: boolean {
  var self/eax: (addr word) <- copy _self
  var data-ah/eax: (addr handle gap-buffer) <- get self, scalar-data
  var data/eax: (addr gap-buffer) <- lookup *data-ah
  var result/eax: boolean <- gap-buffer-is-decimal-integer? data
  return result
}

# ABSOLUTELY GHASTLY
fn word-exists? _haystack-ah: (addr handle word), _needle: (addr word) -> _/ebx: boolean {
  var needle-name-storage: (handle array byte)
  var needle-name-ah/eax: (addr handle array byte) <- address needle-name-storage
  word-to-string _needle, needle-name-ah  # profligate leak
  var _needle-name/eax: (addr array byte) <- lookup *needle-name-ah
  var needle-name/edi: (addr array byte) <- copy _needle-name
  # base case
  var haystack-ah/esi: (addr handle word) <- copy _haystack-ah
  var curr/eax: (addr word) <- lookup *haystack-ah
  compare curr, 0
  {
    break-if-!=
    return 0/false
  }
  # check curr
  var curr-name-storage: (handle array byte)
  var curr-name-ah/ecx: (addr handle array byte) <- address curr-name-storage
  word-to-string curr, curr-name-ah  # profligate leak
  var curr-name/eax: (addr array byte) <- lookup *curr-name-ah
  var found?/eax: boolean <- string-equal? needle-name, curr-name
  compare found?, 0
  {
    break-if-=
    return 1/true
  }
  # recurse
  var curr/eax: (addr word) <- lookup *haystack-ah
  var next-haystack-ah/eax: (addr handle word) <- get curr, next
  var result/ebx: boolean <- word-exists? next-haystack-ah, _needle
  return result
}

fn word-list-length words: (addr handle word) -> _/eax: int {
  var curr-ah/esi: (addr handle word) <- copy words
  var result/edi: int <- copy 0
  {
    var curr/eax: (addr word) <- lookup *curr-ah
    compare curr, 0
    break-if-=
    {
      var word-len/eax: int <- word-length curr
      result <- add word-len
      result <- add 1/inter-word-margin
    }
    curr-ah <- get curr, next
    loop
  }
  return result
}

# out-ah already has a word allocated and initialized
fn parse-words in: (addr array byte), out-ah: (addr handle word) {
  var in-stream: (stream byte 0x100)
  var in-stream-a/esi: (addr stream byte) <- address in-stream
  write in-stream-a, in
  var cursor-word-ah/ebx: (addr handle word) <- copy out-ah
  $parse-words:loop: {
    var done?/eax: boolean <- stream-empty? in-stream-a
    compare done?, 0/false
    break-if-!=
    var _g/eax: code-point-utf8 <- read-code-point-utf8 in-stream-a
    var g/ecx: code-point-utf8 <- copy _g
    # if not space, insert
    compare g, 0x20/space
    {
      break-if-=
      var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
      add-code-point-utf8-to-word cursor-word, g
      loop $parse-words:loop
    }
    # otherwise insert word after and move cursor to it
    append-word cursor-word-ah
    var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
    cursor-to-start cursor-word  # reset cursor in each function
    cursor-word-ah <- get cursor-word, next
    loop
  }
}