about summary refs log tree commit diff stats
path: root/cpp/071print.mu
blob: 2bf1df0b76e61ce0ee16bfb531b040ae857033e7 (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
# Wrappers around print primitives that take a 'screen' object and are thus
# easier to test.

container screen [
  num-rows:integer
  num-columns:integer
  cursor-row:integer
  cursor-column:integer
  data:address:array:character
]

recipe init-fake-screen [
  default-space:address:array:location <- new location:type, 30:literal/capacity
  result:address:screen <- new screen:type
  width:address:integer <- get-address result:address:screen/deref, num-columns:offset
  width:address:integer/deref <- next-ingredient
  height:address:integer <- get-address result:address:screen/deref, num-rows:offset
  height:address:integer/deref <- next-ingredient
  row:address:integer <- get-address result:address:screen/deref, cursor-row:offset
  row:address:integer/deref <- copy 0:literal
  column:address:integer <- get-address result:address:screen/deref, cursor-column:offset
  column:address:integer/deref <- copy 0:literal
  bufsize:integer <- multiply width:address:integer/deref, height:address:integer/deref
  buf:address:address:array:character <- get-address result:address:screen/deref, data:offset
  buf:address:address:array:character/deref <- new character:literal, bufsize:integer
  clear-screen result:address:screen
  reply result:address:screen
]

recipe clear-screen [
  default-space:address:array:location <- new location:type, 30:literal
  x:address:screen <- next-ingredient
  # if x exists
  {
    break-unless x:address:screen
    # clear fake screen
    buf:address:array:character <- get x:address:screen/deref, data:offset
    max:integer <- length buf:address:array:character/deref
    i:integer <- copy 0:literal
    {
      done?:boolean <- greater-or-equal i:integer, max:integer
      break-if done?:boolean
      c:address:character <- index-address buf:address:array:character/deref, i:integer
      c:address:character/deref <- copy [ ]
      i:integer <- add i:integer, 1:literal
      loop
    }
    reply x:address:screen/same-as-ingredient:0
  }
  # otherwise, real screen
  clear-display
  reply x:address:screen/same-as-ingredient:0
]

recipe print-character [
  default-space:address:array:location <- new location:type, 30:literal
  x:address:screen <- next-ingredient
  c:character <- next-ingredient
#?   $print x:address:character #? 1
#?   $print [ print-character #? 1
#? ] #? 1
  {
    # if x exists
    break-unless x:address:screen
#?   $print [print-character2 #? 1
#? ] #? 1
    # save character in fake screen
    row:address:integer <- get-address x:address:screen/deref, cursor-row:offset
    column:address:integer <- get-address x:address:screen/deref, cursor-column:offset
    width:integer <- get x:address:screen/deref, num-columns:offset
    index:integer <- multiply row:address:integer/deref, width:integer
    index:integer <- add index:integer, column:address:integer/deref
    buf:address:array:character <- get x:address:screen/deref, data:offset
    cursor:address:character <- index-address buf:address:array:character/deref, index:integer
#?     $print cursor:address:character #? 1
#?     $print [ #? 1
#? ] #? 1
    cursor:address:character/deref <- copy c:character  # todo: newline, etc.
    # increment column unless it's already all the way to the right
    {
      at-right?:boolean <- equal column:address:integer/deref, width:integer
      break-if at-right?:boolean
      column:address:integer/deref <- add column:address:integer/deref, 1:literal
    }
    reply x:address:screen/same-as-ingredient:0
  }
  # otherwise, real screen
  print-character-to-display c:character
  reply x:address:screen/same-as-ingredient:0
]

scenario print-character-at-top-left [
  run [
#?     $start-tracing #? 3
    1:address:screen <- init-fake-screen 3:literal/width, 2:literal/height
    1:address:screen <- print-character 1:address:screen, 97:literal  # 'a'
    2:address:array:character <- get 1:address:screen/deref, data:offset
    3:array:character <- copy 2:address:array:character/deref
  ]
  memory-should-contain [
    3 <- 6  # width*height
    4 <- 97  # 'a'
    5 <- 0
  ]
]

recipe clear-line [
  default-space:address:array:location <- new location:type, 30:literal
  x:address:screen <- next-ingredient
  # if x exists, clear line in fake screen
  {
    break-unless x:address:screen
    n:integer <- get x:address:screen/deref, num-columns:offset
    column:address:integer <- get-address x:address:screen/deref, cursor-column:offset
    original-column:integer <- copy column:address:integer/deref
    # space over the entire line
    {
      done?:boolean <- greater-or-equal column:address:integer/deref, n:integer
      break-if done?:boolean
      print-character x:address:screen, [ ]  # implicitly updates 'column'
      loop
    }
    # now back to where the cursor was
    column:address:integer/deref <- copy original-column:integer
    reply x:address:screen/same-as-ingredient:0
  }
  # otherwise, real screen
  clear-line-on-display
  reply x:address:screen/same-as-ingredient:0
]

recipe cursor-position [
  default-space:address:array:location <- new location:type, 30:literal
  x:address:screen <- next-ingredient
  # if x exists, lookup cursor in fake screen
  {
    break-unless x:address:screen
    row:integer <- get x:address:screen/deref, cursor-row:offset
    column:integer <- get x:address:screen/deref, cursor-column:offset
    reply row:integer, column:integer
  }
  row:integer, column:integer <- cursor-position-on-display
  reply row:integer, column:integer
]

recipe move-cursor [
  default-space:address:array:location <- new location:type, 30:literal
  x:address:screen <- next-ingredient
  new-row:integer <- next-ingredient
  new-column:integer <- next-ingredient
  # if x exists, move cursor in fake screen
  {
    break-unless x:address:screen
    row:address:integer <- get-address x:address:screen/deref cursor-row:offset
    row:address:integer/deref <- copy new-row:integer
    column:address:integer <- get-address x:address:screen/deref cursor-column:offset
    column:address:integer/deref <- copy new-column:integer
    reply x:address:screen/same-as-ingredient:0
  }
  # otherwise, real screen
  move-cursor-on-display new-row:integer, new-column:integer
  reply x:address:screen/same-as-ingredient:0
]

scenario clear-line-erases-printed-characters [
  run [
#?     $start-tracing #? 3
    1:address:screen <- init-fake-screen 3:literal/width, 2:literal/height
    # print a character
    1:address:screen <- print-character 1:address:screen, 97:literal  # 'a'
    # move cursor to start of line
    1:address:screen <- move-cursor 1:address:screen, 0:literal/row, 0:literal/column
    # clear line
    1:address:screen <- clear-line 1:address:screen
    2:address:array:character <- get 1:address:screen/deref, data:offset
    3:array:character <- copy 2:address:array:character/deref
  ]
  # screen should be blank
  memory-should-contain [
    3 <- 6  # width*height
    4 <- 0
    5 <- 0
    6 <- 0
    7 <- 0
    8 <- 0
    9 <- 0
  ]
]

recipe cursor-down [
  default-space:address:array:location <- new location:type, 30:literal
  x:address:screen <- next-ingredient
  # if x exists, move cursor in fake screen
  {
    break-unless x:address:screen
    {
      # if row < height
      height:integer <- get x:address:screen/deref, num-rows:offset
      row:address:integer <- get-address x:address:screen/deref cursor-row:offset
      at-bottom?:boolean <- greater-or-equal row:address:integer/deref, height:integer
      break-if at-bottom?:boolean
      # row = row+1
      row:address:integer/deref <- add row:address:integer, 1:literal
    }
    reply x:address:screen/same-as-ingredient:0
  }
  # otherwise, real screen
  move-cursor-down-on-display
  reply x:address:screen/same-as-ingredient:0
]

recipe cursor-up [
  default-space:address:array:location <- new location:type, 30:literal
  x:address:screen <- next-ingredient
  # if x exists, move cursor in fake screen
  {
    break-unless x:address:screen
    {
      # if row >= 0
      row:address:integer <- get-address x:address:screen/deref cursor-row:offset
      at-top?:boolean <- lesser-than row:address:integer/deref, 0:literal
      break-if at-top?:boolean
      # row = row-1
      row:address:integer/deref <- subtract row:address:integer, 1:literal
    }
    reply x:address:screen/same-as-ingredient:0
  }
  # otherwise, real screen
  move-cursor-up-on-display
  reply x:address:screen/same-as-ingredient:0
]

recipe cursor-right [
  default-space:address:array:location <- new location:type, 30:literal
  x:address:screen <- next-ingredient
  # if x exists, move cursor in fake screen
  {
    break-unless x:address:screen
    {
      # if column < width
      width:integer <- get x:address:screen/deref, num-columns:offset
      column:address:integer <- get-address x:address:screen/deref cursor-column:offset
      at-bottom?:boolean <- greater-or-equal column:address:integer/deref, width:integer
      break-if at-bottom?:boolean
      # column = column+1
      column:address:integer/deref <- add column:address:integer, 1:literal
    }
    reply x:address:screen/same-as-ingredient:0
  }
  # otherwise, real screen
  move-cursor-right-on-display
  reply x:address:screen/same-as-ingredient:0
]

recipe cursor-left [
  default-space:address:array:location <- new location:type, 30:literal
  x:address:screen <- next-ingredient
  # if x exists, move cursor in fake screen
  {
    break-unless x:address:screen
    {
      # if column >= 0
      column:address:integer <- get-address x:address:screen/deref cursor-column:offset
      at-top?:boolean <- lesser-than column:address:integer/deref, 0:literal
      break-if at-top?:boolean
      # column = column-1
      column:address:integer/deref <- subtract column:address:integer, 1:literal
    }
    reply x:address:screen/same-as-ingredient:0
  }
  # otherwise, real screen
  move-cursor-left-on-display
  reply x:address:screen/same-as-ingredient:0
]