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
|
## putting the environment together out of editors
def! main [
local-scope
open-console
clear-screen null/screen # non-scrolling app
env:&:environment <- new-programming-environment null/filesystem, null/screen
render-all null/screen, env, render
event-loop null/screen, null/console, env, null/filesystem
]
container environment [
current-sandbox:&:editor
]
def new-programming-environment resources:&:resources, screen:&:screen, test-sandbox-editor-contents:text -> result:&:environment [
local-scope
load-inputs
width:num <- screen-width screen
result <- new environment:type
# sandbox editor
current-sandbox:&:editor <- new-editor test-sandbox-editor-contents, 0/left, width/right
*result <- put *result, current-sandbox:offset, current-sandbox
<programming-environment-initialization>
]
def event-loop screen:&:screen, console:&:console, env:&:environment, resources:&:resources -> screen:&:screen, console:&:console, env:&:environment, resources:&:resources [
local-scope
load-inputs
current-sandbox:&:editor <- get *env, current-sandbox:offset
# if we fall behind we'll stop updating the screen, but then we have to
# render the entire screen when we catch up.
# todo: test this
render-all-on-no-more-events?:bool <- copy false
{
# looping over each (keyboard or touch) event as it occurs
+next-event
e:event, found?:bool, quit?:bool, console <- read-event console
loop-unless found?
break-if quit? # only in tests
trace 10, [app], [next-event]
<handle-event>
# check for global events that will trigger regardless of which editor has focus
{
k:num, is-keycode?:bool <- maybe-convert e:event, keycode:variant
break-unless is-keycode?
<global-keypress>
}
{
c:char, is-unicode?:bool <- maybe-convert e:event, text:variant
break-unless is-unicode?
<global-type>
}
# 'touch' event
{
t:touch-event, is-touch?:bool <- maybe-convert e:event, touch:variant
break-unless is-touch?
# ignore all but 'left-click' events for now
# todo: test this
touch-type:num <- get t, type:offset
is-left-click?:bool <- equal touch-type, 65513/mouse-left
loop-unless is-left-click?, +next-event
click-row:num <- get t, row:offset
click-column:num <- get t, column:offset
# later exceptions for non-editor touches will go here
<global-touch>
move-cursor current-sandbox, screen, t
screen <- update-cursor screen, current-sandbox, env
loop +next-event
}
# 'resize' event - redraw editor
# todo: test this after supporting resize in assume-console
{
r:resize-event, is-resize?:bool <- maybe-convert e:event, resize:variant
break-unless is-resize?
env, screen <- resize screen, env
screen <- render-all screen, env, render-without-moving-cursor
loop +next-event
}
# not global and not a touch event
{
render?:bool <- handle-keyboard-event screen, current-sandbox, e:event
# try to batch up rendering if there are more events queued up
render-all-on-no-more-events? <- or render-all-on-no-more-events?, render?
more-events?:bool <- has-more-events? console
{
break-if more-events?
break-unless render-all-on-no-more-events?
render-all-on-no-more-events? <- copy false
screen <- render-all screen, env, render
}
screen <- update-cursor screen, current-sandbox, env
}
loop
}
]
def resize screen:&:screen, env:&:environment -> env:&:environment, screen:&:screen [
local-scope
load-inputs
clear-screen screen # update screen dimensions
width:num <- screen-width screen
# update sandbox editor
current-sandbox:&:editor <- get *env, current-sandbox:offset
right:num <- subtract width, 1
*current-sandbox <- put *current-sandbox right:offset, right
# reset cursor
*current-sandbox <- put *current-sandbox, cursor-row:offset, 1
*current-sandbox <- put *current-sandbox, cursor-column:offset, 0
]
# Variant of 'render' that updates cursor-row and cursor-column based on
# before-cursor (rather than the other way around). If before-cursor moves
# off-screen, it resets cursor-row and cursor-column.
def render-without-moving-cursor screen:&:screen, editor:&:editor -> last-row:num, last-column:num, screen:&:screen, editor:&:editor [
local-scope
load-inputs
return-unless editor, 1/top, 0/left
left:num <- get *editor, left:offset
screen-height:num <- screen-height screen
right:num <- get *editor, right:offset
curr:&:duplex-list:char <- get *editor, top-of-screen:offset
prev:&:duplex-list:char <- copy curr # just in case curr becomes null and we can't compute prev
curr <- next curr
color:num <- copy 7/white
row:num <- copy 1/top
column:num <- copy left
# save before-cursor
old-before-cursor:&:duplex-list:char <- get *editor, before-cursor:offset
# initialze cursor-row/cursor-column/before-cursor to the top of the screen
# by default
*editor <- put *editor, cursor-row:offset, row
*editor <- put *editor, cursor-column:offset, column
top-of-screen:&:duplex-list:char <- get *editor, top-of-screen:offset
*editor <- put *editor, before-cursor:offset, top-of-screen
screen <- move-cursor screen, row, column
{
+next-character
break-unless curr
off-screen?:bool <- greater-or-equal row, screen-height
break-if off-screen?
# if we find old-before-cursor still on the new resized screen, update
# editor.cursor-row and editor.cursor-column based on
# old-before-cursor
{
at-cursor?:bool <- equal old-before-cursor, prev
break-unless at-cursor?
*editor <- put *editor, cursor-row:offset, row
*editor <- put *editor, cursor-column:offset, column
*editor <- put *editor, before-cursor:offset, old-before-cursor
}
c:char <- get *curr, value:offset
<character-c-received>
{
# newline? move to left rather than 0
newline?:bool <- equal c, 10/newline
break-unless newline?
# clear rest of line in this window
clear-line-until screen, 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
}
{
# at right? wrap. even if there's only one more letter left; we need
# room for clicking on the cursor after it.
at-right?:bool <- equal column, right
break-unless at-right?
# print wrap icon
wrap-icon:char <- 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
}
print screen, c, color
curr <- next curr
prev <- next prev
column <- add column, 1
loop
}
# save first character off-screen
*editor <- put *editor, bottom-of-screen:offset, curr
*editor <- put *editor, bottom:offset, row
return row, column
]
type render-recipe = (recipe (address screen) (address editor) -> number number (address screen) (address editor))
def render-all screen:&:screen, env:&:environment, render-editor:render-recipe -> screen:&:screen, env:&:environment [
local-scope
load-inputs
trace 10, [app], [render all]
# top menu
trace 11, [app], [render top menu]
width:num <- screen-width screen
draw-horizontal screen, 0, 0/left, width, 32/space, 0/black, 238/grey
button-start:num <- subtract width, 20
button-on-screen?:bool <- greater-or-equal button-start, 0
assert button-on-screen?, [screen too narrow for menu]
screen <- move-cursor screen, 0/row, button-start
print screen, [ run (F4) ], 255/white, 161/reddish
#
screen <- render-sandbox-side screen, env, render-editor
<end-render-components> # no early returns permitted
#
current-sandbox:&:editor <- get *env, current-sandbox:offset
screen <- update-cursor screen, current-sandbox, env
]
# replaced in a later layer
def render-sandbox-side screen:&:screen, env:&:environment, render-editor:render-recipe -> screen:&:screen, env:&:environment [
local-scope
load-inputs
trace 11, [app], [render sandboxes]
old-top-idx:num <- save-top-idx screen
current-sandbox:&:editor <- get *env, current-sandbox:offset
left:num <- get *current-sandbox, left:offset
right:num <- get *current-sandbox, right:offset
row:num, column:num, screen, current-sandbox <- call render-editor, screen, current-sandbox
# draw solid line after code (you'll see why in later layers)
draw-horizontal screen, row, left, right
row <- add row, 1
clear-screen-from screen, row, left, left, right
#
assert-no-scroll screen, old-top-idx
]
def update-cursor screen:&:screen, current-sandbox:&:editor, env:&:environment -> screen:&:screen [
local-scope
load-inputs
<update-cursor-special-cases>
cursor-row:num <- get *current-sandbox, cursor-row:offset
cursor-column:num <- get *current-sandbox, cursor-column:offset
screen <- move-cursor screen, cursor-row, cursor-column
]
scenario backspace-over-text [
local-scope
trace-until 100/app # trace too long
assume-screen 50/width, 15/height
# recipes.mu is empty
assume-resources [
]
# sandbox editor contains an instruction without storing outputs
env:&:environment <- new-programming-environment resources, screen, []
render-all screen, env, render
# run the code in the editors
assume-console [
type [a]
press backspace
]
run [
event-loop screen, console, env, resources
10:num/raw <- get *screen, cursor-row:offset
11:num/raw <- get *screen, cursor-column:offset
]
memory-should-contain [
10 <- 1
11 <- 0
]
]
|