1 ## putting the environment together out of editors
  2 #
  3 # Consists of one editor on the left for recipes and one on the right for the
  4 # sandbox.
  5 
  6 def! main [
  7   local-scope
  8   open-console
  9   clear-screen 0/screen  # non-scrolling app
 10   env:&:environment <- new-programming-environment 0/filesystem, 0/screen
 11   render-all 0/screen, env, render
 12   event-loop 0/screen, 0/console, env, 0/filesystem
 13 ]
 14 
 15 container environment [
 16   recipes:&:editor
 17   current-sandbox:&:editor
 18   sandbox-in-focus?:bool  # false => cursor in recipes; true => cursor in current-sandbox
 19 ]
 20 
 21 def new-programming-environment resources:&:resources, screen:&:screen, test-sandbox-editor-contents:text -> result:&:environment [
 22   local-scope
 23   load-inputs
 24   width:num <- screen-width screen
 25   result <- new environment:type
 26   # recipe editor on the left
 27   initial-recipe-contents:text <- slurp resources, [lesson/recipes.mu]  # ignore errors
 28   divider:num, _ <- divide-with-remainder width, 2
 29   recipes:&:editor <- new-editor initial-recipe-contents, 0/left, divider/right
 30   # sandbox editor on the right
 31   sandbox-left:num <- add divider, 1
 32   current-sandbox:&:editor <- new-editor test-sandbox-editor-contents, sandbox-left, width/right
 33   *result <- put *result, recipes:offset, recipes
 34   *result <- put *result, current-sandbox:offset, current-sandbox
 35   *result <- put *result, sandbox-in-focus?:offset, 0/false
 36   <programming-environment-initialization>
 37 ]
 38 
 39 def event-loop screen:&:screen, console:&:console, env:&:environment, resources:&:resources -> screen:&:screen, console:&:console, env:&:environment, resources:&:resources [
 40   local-scope
 41   load-inputs
 42   recipes:&:editor <- get *env, recipes:offset
 43   current-sandbox:&:editor <- get *env, current-sandbox:offset
 44   sandbox-in-focus?:bool <- get *env, sandbox-in-focus?:offset
 45   # if we fall behind we'll stop updating the screen, but then we have to
 46   # render the entire screen when we catch up.
 47   # todo: test this
 48   render-recipes-on-no-more-events?:bool <- copy 0/false
 49   render-sandboxes-on-no-more-events?:bool <- copy 0/false
 50   {
 51     # looping over each (keyboard or touch) event as it occurs
 52     +next-event
 53     e:event, found?:bool, quit?:bool, console <- read-event console
 54     loop-unless found?
 55     break-if quit?  # only in tests
 56     trace 10, [app], [next-event]
 57     <handle-event>
 58     # check for global events that will trigger regardless of which editor has focus
 59     {
 60       k:num, is-keycode?:bool <- maybe-convert e:event, keycode:variant
 61       break-unless is-keycode?
 62       <global-keypress>
 63     }
 64     {
 65       c:char, is-unicode?:bool <- maybe-convert e:event, text:variant
 66       break-unless is-unicode?
 67       <global-type>
 68     }
 69     # 'touch' event - send to both sides, see what picks it up
 70     {
 71       t:touch-event, is-touch?:bool <- maybe-convert e:event, touch:variant
 72       break-unless is-touch?
 73       # ignore all but 'left-click' events for now
 74       # todo: test this
 75       touch-type:num <- get t, type:offset
 76       is-left-click?:bool <- equal touch-type, 65513/mouse-left
 77       loop-unless is-left-click?, +next-event
 78       click-row:num <- get t, row:offset
 79       click-column:num <- get t, column:offset
 80       # later exceptions for non-editor touches will go here
 81       <global-touch>
 82       # send to both editors
 83       _ <- move-cursor recipes, screen, t
 84       sandbox-in-focus?:bool <- move-cursor current-sandbox, screen, t
 85       *env <- put *env, sandbox-in-focus?:offset, sandbox-in-focus?
 86       screen <- update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
 87       loop +next-event
 88     }
 89     # 'resize' event - redraw editor
 90     # todo: test this after supporting resize in assume-console
 91     {
 92       r:resize-event, is-resize?:bool <- maybe-convert e:event, resize:variant
 93       break-unless is-resize?
 94       env, screen <- resize screen, env
 95       screen <- render-all screen, env, render-without-moving-cursor
 96       loop +next-event
 97     }
 98     # if it's not global and not a touch event, send to appropriate editor
 99     {
100       sandbox-in-focus?:bool <- get *env, sandbox-in-focus?:offset
101       {
102         break-if sandbox-in-focus?
103         render?:bool <- handle-keyboard-event screen, recipes, e:event
104         render-recipes-on-no-more-events? <- or render?, render-recipes-on-no-more-events?
105       }
106       {
107         break-unless sandbox-in-focus?
108         render?:bool <- handle-keyboard-event screen, current-sandbox, e:event
109         render-sandboxes-on-no-more-events? <- or render?, render-sandboxes-on-no-more-events?
110       }
111       more-events?:bool <- has-more-events? console
112       {
113         break-if more-events?
114         {
115           break-unless render-recipes-on-no-more-events?
116           render-recipes-on-no-more-events? <- copy 0/false
117           screen <- render-recipes screen, env, render
118         }
119         {
120           break-unless render-sandboxes-on-no-more-events?
121           render-sandboxes-on-no-more-events? <- copy 0/false
122           screen <- render-sandbox-side screen, env, render
123         }
124       }
125       screen <- update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
126     }
127     loop
128   }
129 ]
130 
131 def resize screen:&:screen, env:&:environment -> env:&:environment, screen:&:screen [
132   local-scope
133   load-inputs
134   clear-screen screen  # update screen dimensions
135   width:num <- screen-width screen
136   divider:num, _ <- divide-with-remainder width, 2
137   # update recipe editor
138   recipes:&:editor <- get *env, recipes:offset
139   right:num <- subtract divider, 1
140   *recipes <- put *recipes, right:offset, right
141   # reset cursor (later we'll try to preserve its position)
142   *recipes <- put *recipes, cursor-row:offset, 1
143   *recipes <- put *recipes, cursor-column:offset, 0
144   # update sandbox editor
145   current-sandbox:&:editor <- get *env, current-sandbox:offset
146   left:num <- add divider, 1
147   *current-sandbox <- put *current-sandbox, left:offset, left
148   right:num <- subtract width, 1
149   *current-sandbox <- put *current-sandbox, right:offset, right
150   # reset cursor (later we'll try to preserve its position)
151   *current-sandbox <- put *current-sandbox, cursor-row:offset, 1
152   *current-sandbox <- put *current-sandbox, cursor-column:offset, left
153 ]
154 
155 # Variant of 'render' that updates cursor-row and cursor-column based on
156 # before-cursor (rather than the other way around). If before-cursor moves
157 # off-screen, it resets cursor-row and cursor-column.
158 def render-without-moving-cursor screen:&:screen, editor:&:editor -> last-row:num, last-column:num, screen:&:screen, editor:&:editor [
159   local-scope
160   load-inputs
161   return-unless editor, 1/top, 0/left
162   left:num <- get *editor, left:offset
163   screen-height:num <- screen-height screen
164   right:num <- get *editor, right:offset
165   curr:&:duplex-list:char <- get *editor, top-of-screen:offset
166   prev:&:duplex-list:char <- copy curr  # just in case curr becomes null and we can't compute prev
167   curr <- next curr
168   color:num <- copy 7/white
169   row:num <- copy 1/top
170   column:num <- copy left
171   # save before-cursor
172   old-before-cursor:&:duplex-list:char <- get *editor, before-cursor:offset
173   # initialze cursor-row/cursor-column/before-cursor to the top of the screen
174   # by default
175   *editor <- put *editor, cursor-row:offset, row
176   *editor <- put *editor, cursor-column:offset, column
177   top-of-screen:&:duplex-list:char <- get *editor, top-of-screen:offset
178   *editor <- put *editor, before-cursor:offset, top-of-screen
179   screen <- move-cursor screen, row, column
180   {
181     +next-character
182     break-unless curr
183     off-screen?:bool <- greater-or-equal row, screen-height
184     break-if off-screen?
185     # if we find old-before-cursor still on the new resized screen, update
186     # editor.cursor-row and editor.cursor-column based on
187     # old-before-cursor
188     {
189       at-cursor?:bool <- equal old-before-cursor, prev
190       break-unless at-cursor?
191       *editor <- put *editor, cursor-row:offset, row
192       *editor <- put *editor, cursor-column:offset, column
193       *editor <- put *editor, before-cursor:offset, old-before-cursor
194     }
195     c:char <- get *curr, value:offset
196     <character-c-received>
197     {
198       # newline? move to left rather than 0
199       newline?:bool <- equal c, 10/newline
200       break-unless newline?
201       # clear rest of line in this window
202       clear-line-until screen, right
203       # skip to next line
204       row <- add row, 1
205       column <- copy left
206       screen <- move-cursor screen, row, column
207       curr <- next curr
208       prev <- next prev
209       loop +next-character
210     }
211     {
212       # at right? wrap. even if there's only one more letter left; we need
213       # room for clicking on the cursor after it.
214       at-right?:bool <- equal column, right
215       break-unless at-right?
216       # print wrap icon
217       wrap-icon:char <- copy 8617/loop-back-to-left
218       print screen, wrap-icon, 245/grey
219       column <- copy left
220       row <- add row, 1
221       screen <- move-cursor screen, row, column
222       # don't increment curr
223       loop +next-character
224     }
225     print screen, c, color
226     curr <- next curr
227     prev <- next prev
228     column <- add column, 1
229     loop
230   }
231   # save first character off-screen
232   *editor <- put *editor, bottom-of-screen:offset, curr
233   *editor <- put *editor, bottom:offset, row
234   return row, column
235 ]
236 
237 scenario point-at-multiple-editors [
238   local-scope
239   trace-until 100/app  # trace too long
240   assume-screen 30/width, 5/height
241   # initialize both halves of screen
242   assume-resources [
243     [lesson/recipes.mu] <- [
244       |abc|
245     ]
246   ]
247   env:&:environment <- new-programming-environment resources, screen, [def]  # contents of sandbox editor
248   # focus on both sides
249   assume-console [
250     left-click 1, 1
251     left-click 1, 17
252   ]
253   # check cursor column in each
254   run [
255     event-loop screen, console, env, resources
256     recipes:&:editor <- get *env, recipes:offset
257     5:num/raw <- get *recipes, cursor-column:offset
258     sandbox:&:editor <- get *env, current-sandbox:offset
259     7:num/raw <- get *sandbox, cursor-column:offset
260   ]
261   memory-should-contain [
262     5 <- 1
263     7 <- 17
264   ]
265 ]
266 
267 scenario edit-multiple-editors [
268   local-scope
269   trace-until 100/app  # trace too long
270   assume-screen 30/width, 5/height
271   # initialize both halves of screen
272   assume-resources [
273     [lesson/recipes.mu] <- [
274       |abc|
275     ]
276   ]
277   env:&:environment <- new-programming-environment resources, screen, [def]  # contents of sandbox
278   render-all screen, env, render
279   # type one letter in each of them
280   assume-console [
281     left-click 1, 1
282     type [0]
283     left-click 1, 17
284     type [1]
285   ]
286   run [
287     event-loop screen, console, env, resources
288     recipes:&:editor <- get *env, recipes:offset
289     5:num/raw <- get *recipes, cursor-column:offset
290     sandbox:&:editor <- get *env, current-sandbox:offset
291     7:num/raw <- get *sandbox, cursor-column:offset
292   ]
293   screen-should-contain [
294     .           run (F4)           .  # this line has a different background, but we don't test that yet
295     .a0bc           ╎d1ef          .
296     .               ╎──────────────.
297     .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .
298     .               ╎              .
299   ]
300   memory-should-contain [
301     5 <- 2  # cursor column of recipe editor
302     7 <- 18  # cursor column of sandbox editor
303   ]
304   # show the cursor at the right window
305   run [
306     cursor:char <- copy 9251/␣
307     print screen, cursor
308   ]
309   screen-should-contain [
310     .           run (F4)           .
311     .a0bc           ╎d1␣f          .
312     .               ╎──────────────.
313     .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .
314     .               ╎              .
315   ]
316 ]
317 
318 scenario editor-in-focus-keeps-cursor [
319   local-scope
320   trace-until 100/app  # trace too long
321   assume-screen 30/width, 5/height
322   assume-resources [
323     [lesson/recipes.mu] <- [
324       |abc|
325     ]
326   ]
327   env:&:environment <- new-programming-environment resources, screen, [def]
328   render-all screen, env, render
329   # initialize programming environment and highlight cursor
330   assume-console []
331   run [
332     event-loop screen, console, env, resources
333     cursor:char <- copy 9251/␣
334     print screen, cursor
335   ]
336   # is cursor at the right place?
337   screen-should-contain [
338     .           run (F4)           .
339     .␣bc            ╎def           .
340     .               ╎──────────────.
341     .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .
342     .               ╎              .
343   ]
344   # now try typing a letter
345   assume-console [
346     type [z]
347   ]
348   run [
349     event-loop screen, console, env, resources
350     cursor:char <- copy 9251/␣
351     print screen, cursor
352   ]
353   # cursor should still be right
354   screen-should-contain [
355     .           run (F4)           .
356     .z␣bc           ╎def           .
357     .               ╎──────────────.
358     .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .
359     .               ╎              .
360   ]
361 ]
362 
363 scenario backspace-in-sandbox-editor-joins-lines [
364   local-scope
365   trace-until 100/app  # trace too long
366   assume-screen 30/width, 5/height
367   assume-resources [
368   ]
369   # initialize sandbox side with two lines
370   test-sandbox-editor-contents:text <- new [abc
371 def]
372   env:&:environment <- new-programming-environment resources, screen, test-sandbox-editor-contents
373   render-all screen, env, render
374   screen-should-contain [
375     .           run (F4)           .
376     .               ╎abc           .
377     .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎def           .
378     .               ╎──────────────.
379     .               ╎              .
380   ]
381   # position cursor at start of second line and hit backspace
382   assume-console [
383     left-click 2, 16
384     press backspace
385   ]
386   run [
387     event-loop screen, console, env, resources
388     cursor:char <- copy 9251/␣
389     print screen, cursor
390   ]
391   # cursor moves to end of old line
392   screen-should-contain [
393     .           run (F4)           .
394     .               ╎abc␣ef        .
395     .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎──────────────.
396     .               ╎              .
397   ]
398 ]
399 
400 type render-recipe = (recipe (address screen) (address editor) -> number number (address screen) (address editor))
401 
402 def render-all screen:&:screen, env:&:environment, render-editor:render-recipe -> screen:&:screen, env:&:environment [
403   local-scope
404   load-inputs
405   trace 10, [app], [render all]
406   # top menu
407   trace 11, [app], [render top menu]
408   width:num <- screen-width screen
409   draw-horizontal screen, 0, 0/left, width, 32/space, 0/black, 238/grey
410   button-start:num <- subtract width, 20
411   button-on-screen?:bool <- greater-or-equal button-start, 0
412   assert button-on-screen?, [screen too narrow for menu]
413   screen <- move-cursor screen, 0/row, button-start
414   print screen, [ run (F4) ], 255/white, 161/reddish
415   # dotted line down the middle
416   trace 11, [app], [render divider]
417   divider:num, _ <- divide-with-remainder width, 2
418   height:num <- screen-height screen
419   draw-vertical screen, divider, 1/top, height, 9482/vertical-dotted
420   #
421   screen <- render-recipes screen, env, render-editor
422   screen <- render-sandbox-side screen, env, render-editor
423   <end-render-components>  # no early returns permitted
424   #
425   recipes:&:editor <- get *env, recipes:offset
426   current-sandbox:&:editor <- get *env, current-sandbox:offset
427   sandbox-in-focus?:bool <- get *env, sandbox-in-focus?:offset
428   screen <- update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
429 ]
430 
431 def render-recipes screen:&:screen, env:&:environment, render-editor:render-recipe -> screen:&:screen, env:&:environment [
432   local-scope
433   load-inputs
434   trace 11, [app], [render recipes]
435   old-top-idx:num <- save-top-idx screen
436   recipes:&:editor <- get *env, recipes:offset
437   # render recipes
438   left:num <- get *recipes, left:offset
439   right:num <- get *recipes, right:offset
440   row:num, column:num, screen <- call render-editor, screen, recipes
441   <end-render-recipe-components>
442   # draw dotted line after recipes
443   draw-horizontal screen, row, left, right, 9480/horizontal-dotted
444   row <- add row, 1
445   clear-screen-from screen, row, left, left, right
446   #
447   assert-no-scroll screen, old-top-idx
448 ]
449 
450 # replaced in a later layer
451 def render-sandbox-side screen:&:screen, env:&:environment, render-editor:render-recipe -> screen:&:screen, env:&:environment [
452   local-scope
453   load-inputs
454   trace 11, [app], [render sandboxes]
455   old-top-idx:num <- save-top-idx screen
456   current-sandbox:&:editor <- get *env, current-sandbox:offset
457   left:num <- get *current-sandbox, left:offset
458   right:num <- get *current-sandbox, right:offset
459   row:num, column:num, screen, current-sandbox <- call render-editor, screen, current-sandbox
460   # draw solid line after code (you'll see why in later layers)
461   draw-horizontal screen, row, left, right
462   row <- add row, 1
463   clear-screen-from screen, row, left, left, right
464   #
465   assert-no-scroll screen, old-top-idx
466 ]
467 
468 def update-cursor screen:&:screen, recipes:&:editor, current-sandbox:&:editor, sandbox-in-focus?:bool, env:&:environment -> screen:&:screen [
469   local-scope
470   load-inputs
471   <update-cursor-special-cases>
472   {
473     break-if sandbox-in-focus?
474     cursor-row:num <- get *recipes, cursor-row:offset
475     cursor-column:num <- get *recipes, cursor-column:offset
476   }
477   {
478     break-unless sandbox-in-focus?
479     cursor-row:num <- get *current-sandbox, cursor-row:offset
480     cursor-column:num <- get *current-sandbox, cursor-column:offset
481   }
482   screen <- move-cursor screen, cursor-row, cursor-column
483 ]
484 
485 # ctrl-n - switch focus
486 # todo: test this
487 
488 after <global-type> [
489   {
490     switch-side?:bool <- equal c, 14/ctrl-n
491     break-unless switch-side?
492     sandbox-in-focus?:bool <- get *env, sandbox-in-focus?:offset
493     sandbox-in-focus? <- not sandbox-in-focus?
494     *env <- put *env, sandbox-in-focus?:offset, sandbox-in-focus?
495     screen <- update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
496     loop +next-event
497   }
498 ]
499 
500 ## helpers
501 
502 def draw-vertical screen:&:screen, col:num, y:num, bottom:num -> screen:&:screen [
503   local-scope
504   load-inputs
505   style:char, style-found?:bool <- next-input
506   {
507     break-if style-found?
508     style <- copy 9474/vertical
509   }
510   color:num, color-found?:bool <- next-input
511   {
512     # default color to white
513     break-if color-found?
514     color <- copy 245/grey
515   }
516   {
517     continue?:bool <- lesser-than y, bottom
518     break-unless continue?
519     screen <- move-cursor screen, y, col
520     print screen, style, color
521     y <- add y, 1
522     loop
523   }
524 ]
525 
526 scenario backspace-over-text [
527   local-scope
528   trace-until 100/app  # trace too long
529   assume-screen 50/width, 15/height
530   # recipes.mu is empty
531   assume-resources [
532   ]
533   # sandbox editor contains an instruction without storing outputs
534   env:&:environment <- new-programming-environment resources, screen, []
535   # run the code in the editors
536   assume-console [
537     type [a]
538     press backspace
539   ]
540   run [
541     event-loop screen, console, env, resources
542     10:num/raw <- get *screen, cursor-row:offset
543     11:num/raw <- get *screen, cursor-column:offset
544   ]
545   memory-should-contain [
546     10 <- 1
547     11 <- 0
548   ]
549 ]