about summary refs log tree commit diff stats
path: root/edit/001-editor.mu
blob: 773b7d77a7362d7bc06eb623725b6c2e70f7f257 (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
## the basic editor data structure, and how it displays text to the screen

# temporary main for this layer: just render the given text at the given
# screen dimensions, then stop
recipe! main text:address:shared:array:character [
  local-scope
  load-ingredients
  open-console
  hide-screen 0/screen
  new-editor text, 0/screen, 0/left, 5/right
  show-screen 0/screen
  wait-for-event 0/console
  close-console
]

scenario editor-initially-prints-text-to-screen [
  assume-screen 10/width, 5/height
  run [
    1:address:shared:array:character <- new [abc]
    new-editor 1:address:shared:array:character, screen:address:shared:screen, 0/left, 10/right
  ]
  screen-should-contain [
    # top line of screen reserved for menu
    .          .
    .abc       .
    .          .
  ]
]

container editor-data [
  # editable text: doubly linked list of characters (head contains a special sentinel)
  data:address:shared:duplex-list:character
  top-of-screen:address:shared:duplex-list:character
  bottom-of-screen:address:shared:duplex-list:character
  # location before cursor inside data
  before-cursor:address:shared:duplex-list:character

  # raw bounds of display area on screen
  # always displays from row 1 (leaving row 0 for a menu) and at most until bottom of screen
  left:number
  right:number
  # raw screen coordinates of cursor
  cursor-row:number
  cursor-column:number
]

# creates a new editor widget and renders its initial appearance to screen
#   top/left/right constrain the screen area available to the new editor
#   right is exclusive
recipe new-editor s:address:shared:array:character, screen:address:shared:screen, left:number, right:number -> result:address:shared:editor-data, screen:address:shared:screen [
  local-scope
  load-ingredients
  # no clipping of bounds
  right <- subtract right, 1
  result <- new editor-data:type
  # initialize screen-related fields
  x:address:number <- get-address *result, left:offset
  *x <- copy left
  x <- get-address *result, right:offset
  *x <- copy right
  # initialize cursor
  x <- get-address *result, cursor-row:offset
  *x <- copy 1/top
  x <- get-address *result, cursor-column:offset
  *x <- copy left
  init:address:address:shared:duplex-list:character <- get-address *result, data:offset
  *init <- push 167/§, 0/tail
  top-of-screen:address:address:shared:duplex-list:character <- get-address *result, top-of-screen:offset
  *top-of-screen <- copy *init
  y:address:address:shared:duplex-list:character <- get-address *result, before-cursor:offset
  *y <- copy *init
  result <- insert-text result, s
  # initialize cursor to top of screen
  y <- get-address *result, before-cursor:offset
  *y <- copy *init
  # initial render to screen, just for some old tests
  _, _, screen, result <- render screen, result
  <editor-initialization>
]

recipe insert-text editor:address:shared:editor-data, text:address:shared:array:character -> editor:address:shared:editor-data [
  local-scope
  load-ingredients
  # early exit if text is empty
  reply-unless text, editor/same-as-ingredient:0
  len:number <- length *text
  reply-unless len, editor/same-as-ingredient:0
  idx:number <- copy 0
  # now we can start appending the rest, character by character
  curr:address:shared:duplex-list:character <- get *editor, data:offset
  {
    done?:boolean <- greater-or-equal idx, len
    break-if done?
    c:character <- index *text, idx
    insert c, curr
    # next iter
    curr <- next curr
    idx <- add idx, 1
    loop
  }
  reply editor/same-as-ingredient:0
]

scenario editor-initializes-without-data [
  assume-screen 5/width, 3/height
  run [
    1:address:shared:editor-data <- new-editor 0/data, screen:address:shared:screen, 2/left, 5/right
    2:editor-data <- copy *1:address:shared:editor-data
  ]
  memory-should-contain [
    # 2 (data) <- just the § sentinel
    # 3 (top of screen) <- the § sentinel
    4 <- 0  # bottom-of-screen; null since text fits on screen
    # 5 (before cursor) <- the § sentinel
    6 <- 2  # left
    7 <- 4  # right  (inclusive)
    8 <- 1  # cursor row
    9 <- 2  # cursor column
  ]
  screen-should-contain [
    .     .
    .     .
    .     .
  ]
]

# Assumes cursor should be at coordinates (cursor-row, cursor-column) and
# updates before-cursor to match. Might also move coordinates if they're
# outside text.
recipe render screen:address:shared:screen, editor:address:shared:editor-data -> last-row:number, last-column:number, screen:address:shared:screen, editor:address:shared:editor-data [
  local-scope
  load-ingredients
  reply-unless editor, 1/top, 0/left, screen/same-as-ingredient:0, editor/same-as-ingredient:1
  left:number <- get *editor, left:offset
  screen-height:number <- screen-height screen
  right:number <- get *editor, right:offset
  # traversing editor
  curr:address:shared:duplex-list:character <- get *editor, top-of-screen:offset
  prev:address:shared:duplex-list:character <- copy curr  # just in case curr becomes null and we can't compute prev
  curr <- next curr
  # traversing screen
  +render-loop-initialization
  color:number <- copy 7/white
  row:number <- copy 1/top
  column:number <- copy left
  cursor-row:address:number <- get-address *editor, cursor-row:offset
  cursor-column:address:number <- get-address *editor, cursor-column:offset
  before-cursor:address:address:shared:duplex-list:character <- get-address *editor, before-cursor:offset
  screen <- move-cursor screen, row, column
  {
    +next-character
    break-unless curr
    off-screen?:boolean <- greater-or-equal row, screen-height
    break-if off-screen?
    # update editor-data.before-cursor
    # Doing so at the start of each iteration ensures it stays one step behind
    # the current character.
    {
      at-cursor-row?:boolean <- equal row, *cursor-row
      break-unless at-cursor-row?
      at-cursor?:boolean <- equal column, *cursor-column
      break-unless at-cursor?
      *before-cursor <- copy prev
    }
    c:character <- get *curr, value:offset
    <character-c-received>
    {
      # newline? move to left rather than 0
      newline?:boolean <- equal c, 10/newline
      break-unless newline?
      # adjust cursor if necessary
      {
        at-cursor-row?:boolean <- equal row, *cursor-row
        break-unless at-cursor-row?
        left-of-cursor?:boolean <- lesser-than column, *cursor-column
        break-unless left-of-cursor?
        *cursor-column <- copy column
        *before-cursor <- prev curr
      }
      # clear rest of line in this window
      clear-line-delimited screen, column, right
      # skip to next line
      row <- add row, 1
      column <- copy left
      screen <- move-cursor screen, row, column
      curr <- next curr
      prev <- next prev
      loop +next-character:label
    }
    {
      # at right? wrap. even if there's only one more letter left; we need
      # room for clicking on the cursor after it.
      at-right?:boolean <- equal column, right
      break-unless at-right?
      # print wrap icon
      wrap-icon:character <- copy 8617/loop-back-to-left
      print screen, wrap-icon, 245/grey
      column <- copy left
      row <- add row, 1
      screen <- move-cursor screen, row, column
      # don't increment curr
      loop +next-character:label
    }
    print screen, c, color
    curr <- next curr
    prev <- next prev
    column <- add column, 1
    loop
  }
  # save first character off-screen
  bottom-of-screen:address:address:shared:duplex-list:character <- get-address *editor, bottom-of-screen:offset
  *bottom-of-screen <- copy curr
  # is cursor to the right of the last line? move to end
  {
    at-cursor-row?:boolean <- equal row, *cursor-row
    cursor-outside-line?:boolean <- lesser-or-equal column, *cursor-column
    before-cursor-on-same-line?:boolean <- and at-cursor-row?, cursor-outside-line?
    above-cursor-row?:boolean <- lesser-than row, *cursor-row
    before-cursor?:boolean <- or before-cursor-on-same-line?, above-cursor-row?
    break-unless before-cursor?
    *cursor-row <- copy row
    *cursor-column <- copy column
    *before-cursor <- copy prev
  }
  reply row, column, screen/same-as-ingredient:0, editor/same-as-ingredient:1
]

recipe clear-line-delimited screen:address:shared:screen, column:number, right:number -> screen:address:shared:screen [
  local-scope
  load-ingredients
  space:character <- copy 32/space
  {
    done?:boolean <- greater-than column, right
    break-if done?
    screen <- print screen, space
    column <- add column, 1
    loop
  }
]

recipe clear-screen-from screen:address:shared:screen, row:number, column:number, left:number, right:number -> screen:address:shared:screen [
  local-scope
  load-ingredients
  # if it's the real screen, use the optimized primitive
  {
    break-if screen
    clear-display-from row, column, left, right
    reply screen/same-as-ingredient:0
  }
  # if not, go the slower route
  screen <- move-cursor screen, row, column
  clear-line-delimited screen, column, right
  clear-rest-of-screen screen, row, left, right
  reply screen/same-as-ingredient:0
]

recipe clear-rest-of-screen screen:address:shared:screen, row:number, left:number, right:number -> screen:address:shared:screen [
  local-scope
  load-ingredients
  row <- add row, 1
  screen <- move-cursor screen, row, left
  screen-height:number <- screen-height screen
  {
    at-bottom-of-screen?:boolean <- greater-or-equal row, screen-height
    break-if at-bottom-of-screen?
    screen <- move-cursor screen, row, left
    clear-line-delimited screen, left, right
    row <- add row, 1
    loop
  }
]

scenario editor-initially-prints-multiple-lines [
  assume-screen 5/width, 5/height
  run [
    s:address:shared:array:character <- new [abc
def]
    new-editor s:address:shared:array:character, screen:address:shared:screen, 0/left, 5/right
  ]
  screen-should-contain [
    .     .
    .abc  .
    .def  .
    .     .
  ]
]

scenario editor-initially-handles-offsets [
  assume-screen 5/width, 5/height
  run [
    s:address:shared:array:character <- new [abc]
    new-editor s:address:shared:array:character, screen:address:shared:screen, 1/left, 5/right
  ]
  screen-should-contain [
    .     .
    . abc .
    .     .
  ]
]

scenario editor-initially-prints-multiple-lines-at-offset [
  assume-screen 5/width, 5/height
  run [
    s:address:shared:array:character <- new [abc
def]
    new-editor s:address:shared:array:character, screen:address:shared:screen, 1/left, 5/right
  ]
  screen-should-contain [
    .     .
    . abc .
    . def .
    .     .
  ]
]

scenario editor-initially-wraps-long-lines [
  assume-screen 5/width, 5/height
  run [
    s:address:shared:array:character <- new [abc def]
    new-editor s:address:shared:array:character, screen:address:shared:screen, 0/left, 5/right
  ]
  screen-should-contain [
    .     .
    .abc .
    .def  .
    .     .
  ]
  screen-should-contain-in-color 245/grey [
    .     .
    .    .
    .     .
    .     .
  ]
]

scenario editor-initially-wraps-barely-long-lines [
  assume-screen 5/width, 5/height
  run [
    s:address:shared:array:character <- new [abcde]
    new-editor s:address:shared:array:character, screen:address:shared:screen, 0/left, 5/right
  ]
  # still wrap, even though the line would fit. We need room to click on the
  # end of the line
  screen-should-contain [
    .     .
    .abcd.
    .e    .
    .     .
  ]
  screen-should-contain-in-color 245/grey [
    .     .
    .    .
    .     .
    .     .
  ]
]

scenario editor-initializes-empty-text [
  assume-screen 5/width, 5/height
  run [
    1:address:shared:array:character <- new []
    2:address:shared:editor-data <- new-editor 1:address:shared:array:character, screen:address:shared:screen, 0/left, 5/right
    3:number <- get *2:address:shared:editor-data, cursor-row:offset
    4:number <- get *2:address:shared:editor-data, cursor-column:offset
  ]
  screen-should-contain [
    .     .
    .     .
    .     .
  ]
  memory-should-contain [
    3 <- 1  # cursor row
    4 <- 0  # cursor column
  ]
]

# just a little color for mu code

scenario render-colors-comments [
  assume-screen 5/width, 5/height
  run [
    s:address:shared:array:character <- new [abc
# de
f]
    new-editor s:address:shared:array:character, screen:address:shared:screen, 0/left, 5/right
  ]
  screen-should-contain [
    .     .
    .abc  .
    .# de .
    .f    .
    .     .
  ]
  screen-should-contain-in-color 12/lightblue, [
    .     .
    .     .
    .# de .
    .     .
    .     .
  ]
  screen-should-contain-in-color 7/white, [
    .     .
    .abc  .
    .     .
    .f    .
    .     .
  ]
]

after <character-c-received> [
  color <- get-color color, c
]

# so far the previous color is all the information we need; that may change
recipe get-color color:number, c:character -> color:number [
  local-scope
  load-ingredients
  color-is-white?:boolean <- equal color, 7/white
  # if color is white and next character is '#', switch color to blue
  {
    break-unless color-is-white?
    starting-comment?:boolean <- equal c, 35/#
    break-unless starting-comment?
    trace 90, [app], [switch color back to blue]
    color <- copy 12/lightblue
    jump +exit:label
  }
  # if color is blue and next character is newline, switch color to white
  {
    color-is-blue?:boolean <- equal color, 12/lightblue
    break-unless color-is-blue?
    ending-comment?:boolean <- equal c, 10/newline
    break-unless ending-comment?
    trace 90, [app], [switch color back to white]
    color <- copy 7/white
    jump +exit:label
  }
  # if color is white (no comments) and next character is '<', switch color to red
  {
    break-unless color-is-white?
    starting-assignment?:boolean <- equal c, 60/<
    break-unless starting-assignment?
    color <- copy 1/red
    jump +exit:label
  }
  # if color is red and next character is space, switch color to white
  {
    color-is-red?:boolean <- equal color, 1/red
    break-unless color-is-red?
    ending-assignment?:boolean <- equal c, 32/space
    break-unless ending-assignment?
    color <- copy 7/white
    jump +exit:label
  }
  # otherwise no change
  +exit
  reply color
]

scenario render-colors-assignment [
  assume-screen 8/width, 5/height
  run [
    s:address:shared:array:character <- new [abc
d <- e
f]
    new-editor s:address:shared:array:character, screen:address:shared:screen, 0/left, 8/right
  ]
  screen-should-contain [
    .        .
    .abc     .
    .d <- e  .
    .f       .
    .        .
  ]
  screen-should-contain-in-color 1/red, [
    .        .
    .        .
    .  <-    .
    .        .
    .        .
  ]
]