about summary refs log tree commit diff stats
path: root/html/403unicode.mu.html
blob: ac5fbedf090a61d79c69b6bbb411eeaf033ee84f (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
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - 403unicode.mu</title>
<meta name="Generator" content="Vim/8.1">
<meta name="plugin-version" content="vim8.1_v1">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal-light">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.CommentedCode { color: #8a8a8a; }
.muComment { color: #005faf; }
.LineNr { }
.SpecialChar { color: #d70000; }
.Constant { color: #008787; }
.muFunction { color: #af5f00; text-decoration: underline; }
.muTest { color: #5f8700; }
.Delimiter { color: #c000c0; }
.PreProc { color: #c000c0; }
-->
</style>

<script type='text/javascript'>
<!--

/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
  var lineNum;
  lineNum = window.location.hash;
  lineNum = lineNum.substr(1); /* strip off '#' */

  if (lineNum.indexOf('L') == -1) {
    lineNum = 'L'+lineNum;
  }
  var lineElem = document.getElementById(lineNum);
  /* Always jump to new location even if the line was hidden inside a fold, or
   * we corrected the raw number to a line ID.
   */
  if (lineElem) {
    lineElem.scrollIntoView(true);
  }
  return true;
}
if ('onhashchange' in window) {
  window.onhashchange = JumpToLine;
}

-->
</script>
</head>
<body onload='JumpToLine();'>
<a href='https://github.com/akkartik/mu/blob/master/403unicode.mu'>https://github.com/akkartik/mu/blob/master/403unicode.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="muComment"># Helpers for Unicode.</span>
<span id="L2" class="LineNr">  2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr">  3 </span><span class="muComment"># Mu has no characters, only code points and graphemes.</span>
<span id="L4" class="LineNr">  4 </span><span class="muComment"># Code points are the indivisible atoms of text streams.</span>
<span id="L5" class="LineNr">  5 </span><span class="muComment">#   <a href="https://en.wikipedia.org/wiki/Code_point">https://en.wikipedia.org/wiki/Code_point</a></span>
<span id="L6" class="LineNr">  6 </span><span class="muComment"># Graphemes are the smallest self-contained unit of text.</span>
<span id="L7" class="LineNr">  7 </span><span class="muComment"># Graphemes may consist of multiple code points.</span>
<span id="L8" class="LineNr">  8 </span><span class="muComment">#</span>
<span id="L9" class="LineNr">  9 </span><span class="muComment"># Mu graphemes are always represented in utf-8, and they are required to fit</span>
<span id="L10" class="LineNr"> 10 </span><span class="muComment"># in 4 bytes.</span>
<span id="L11" class="LineNr"> 11 </span><span class="muComment">#</span>
<span id="L12" class="LineNr"> 12 </span><span class="muComment"># Mu doesn't currently support combining code points, or graphemes made of</span>
<span id="L13" class="LineNr"> 13 </span><span class="muComment"># multiple code points. One day we will.</span>
<span id="L14" class="LineNr"> 14 </span><span class="muComment"># We also don't currently support code points that translate into multiple</span>
<span id="L15" class="LineNr"> 15 </span><span class="muComment"># or wide graphemes. (In particular, Tab will never be supported.)</span>
<span id="L16" class="LineNr"> 16 </span>
<span id="L17" class="LineNr"> 17 </span><span class="muComment"># transliterated from tb_utf8_unicode_to_char in <a href="https://github.com/nsf/termbox">https://github.com/nsf/termbox</a></span>
<span id="L18" class="LineNr"> 18 </span><span class="muComment"># <a href="https://wiki.tcl-lang.org/page/UTF%2D8+bit+by+bit">https://wiki.tcl-lang.org/page/UTF%2D8+bit+by+bit</a> explains the algorithm</span>
<span id="L19" class="LineNr"> 19 </span><span class="muComment">#</span>
<span id="L20" class="LineNr"> 20 </span><span class="muComment"># The day we want to support combining characters, this function will need to</span>
<span id="L21" class="LineNr"> 21 </span><span class="muComment"># take multiple code points. Or something.</span>
<span id="L22" class="LineNr"> 22 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L22'>to-grapheme</a></span> in: code-point<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
<span id="L23" class="LineNr"> 23 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy in
<span id="L24" class="LineNr"> 24 </span>  <span class="PreProc">var</span> num-trailers/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L25" class="LineNr"> 25 </span>  <span class="PreProc">var</span> first/<span class="Constant">edx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L26" class="LineNr"> 26 </span>  $to-grapheme:compute-length: <span class="Delimiter">{</span>
<span id="L27" class="LineNr"> 27 </span>    <span class="muComment"># single byte: just return it</span>
<span id="L28" class="LineNr"> 28 </span>    compare c, <span class="Constant">0x7f</span>
<span id="L29" class="LineNr"> 29 </span>    <span class="Delimiter">{</span>
<span id="L30" class="LineNr"> 30 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L31" class="LineNr"> 31 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy c
<span id="L32" class="LineNr"> 32 </span>      <span class="PreProc">return</span> g
<span id="L33" class="LineNr"> 33 </span>    <span class="Delimiter">}</span>
<span id="L34" class="LineNr"> 34 </span>    <span class="muComment"># 2 bytes</span>
<span id="L35" class="LineNr"> 35 </span>    compare c, <span class="Constant">0x7ff</span>
<span id="L36" class="LineNr"> 36 </span>    <span class="Delimiter">{</span>
<span id="L37" class="LineNr"> 37 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L38" class="LineNr"> 38 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L39" class="LineNr"> 39 </span>      first <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xc0</span>
<span id="L40" class="LineNr"> 40 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
<span id="L41" class="LineNr"> 41 </span>    <span class="Delimiter">}</span>
<span id="L42" class="LineNr"> 42 </span>    <span class="muComment"># 3 bytes</span>
<span id="L43" class="LineNr"> 43 </span>    compare c, <span class="Constant">0xffff</span>
<span id="L44" class="LineNr"> 44 </span>    <span class="Delimiter">{</span>
<span id="L45" class="LineNr"> 45 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L46" class="LineNr"> 46 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">2</span>
<span id="L47" class="LineNr"> 47 </span>      first <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xe0</span>
<span id="L48" class="LineNr"> 48 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
<span id="L49" class="LineNr"> 49 </span>    <span class="Delimiter">}</span>
<span id="L50" class="LineNr"> 50 </span>    <span class="muComment"># 4 bytes</span>
<span id="L51" class="LineNr"> 51 </span>    compare c, <span class="Constant">0x1fffff</span>
<span id="L52" class="LineNr"> 52 </span>    <span class="Delimiter">{</span>
<span id="L53" class="LineNr"> 53 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L54" class="LineNr"> 54 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">3</span>
<span id="L55" class="LineNr"> 55 </span>      first <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xf0</span>
<span id="L56" class="LineNr"> 56 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
<span id="L57" class="LineNr"> 57 </span>    <span class="Delimiter">}</span>
<span id="L58" class="LineNr"> 58 </span>    <span class="muComment"># more than 4 bytes: unsupported</span>
<span id="L59" class="LineNr"> 59 </span>    <span class="muComment"># TODO: print to stderr</span>
<span id="L60" class="LineNr"> 60 </span>    compare c, <span class="Constant">0x1fffff</span>
<span id="L61" class="LineNr"> 61 </span>    <span class="Delimiter">{</span>
<span id="L62" class="LineNr"> 62 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L63" class="LineNr"> 63 </span>      <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">&quot;unsupported code point &quot;</span>
<span id="L64" class="LineNr"> 64 </span>      <a href='304screen.subx.html#L226'>print-int32-hex-to-real-screen</a> c
<span id="L65" class="LineNr"> 65 </span>      <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">&quot;\n&quot;</span>
<span id="L66" class="LineNr"> 66 </span>      <span class="PreProc">var</span> exit-status/<span class="Constant">ebx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L67" class="LineNr"> 67 </span>      syscall_exit
<span id="L68" class="LineNr"> 68 </span>    <span class="Delimiter">}</span>
<span id="L69" class="LineNr"> 69 </span>  <span class="Delimiter">}</span>
<span id="L70" class="LineNr"> 70 </span>  <span class="muComment"># emit trailer bytes, 6 bits from 'in', first two bits '10'</span>
<span id="L71" class="LineNr"> 71 </span>  <span class="PreProc">var</span> result/<span class="Constant">edi</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L72" class="LineNr"> 72 </span>  <span class="Delimiter">{</span>
<span id="L73" class="LineNr"> 73 </span>    compare num-trailers, <span class="Constant">0</span>
<span id="L74" class="LineNr"> 74 </span>    <span class="PreProc">break-if-&lt;=</span>
<span id="L75" class="LineNr"> 75 </span>    <span class="PreProc">var</span> tmp/<span class="Constant">esi</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L76" class="LineNr"> 76 </span>    tmp <span class="SpecialChar">&lt;-</span> and <span class="Constant">0x3f</span>
<span id="L77" class="LineNr"> 77 </span>    tmp <span class="SpecialChar">&lt;-</span> or <span class="Constant">0x80</span>
<span id="L78" class="LineNr"> 78 </span>    result <span class="SpecialChar">&lt;-</span> shift-left <span class="Constant">8</span>
<span id="L79" class="LineNr"> 79 </span>    result <span class="SpecialChar">&lt;-</span> or tmp
<span id="L80" class="LineNr"> 80 </span>    <span class="muComment"># update loop state</span>
<span id="L81" class="LineNr"> 81 </span>    c <span class="SpecialChar">&lt;-</span> shift-right <span class="Constant">6</span>
<span id="L82" class="LineNr"> 82 </span>    num-trailers <span class="SpecialChar">&lt;-</span> decrement
<span id="L83" class="LineNr"> 83 </span>    <span class="PreProc">loop</span>
<span id="L84" class="LineNr"> 84 </span>  <span class="Delimiter">}</span>
<span id="L85" class="LineNr"> 85 </span>  <span class="muComment"># emit engine</span>
<span id="L86" class="LineNr"> 86 </span>  result <span class="SpecialChar">&lt;-</span> shift-left <span class="Constant">8</span>
<span id="L87" class="LineNr"> 87 </span>  result <span class="SpecialChar">&lt;-</span> or c
<span id="L88" class="LineNr"> 88 </span>  result <span class="SpecialChar">&lt;-</span> or first
<span id="L89" class="LineNr"> 89 </span>  <span class="muComment">#</span>
<span id="L90" class="LineNr"> 90 </span>  <span class="PreProc">return</span> result
<span id="L91" class="LineNr"> 91 </span><span class="Delimiter">}</span>
<span id="L92" class="LineNr"> 92 </span>
<span id="L93" class="LineNr"> 93 </span><span class="muComment"># single-byte code point have identical graphemes</span>
<span id="L94" class="LineNr"> 94 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L94'>test-to-grapheme-single-byte</a></span> <span class="Delimiter">{</span>
<span id="L95" class="LineNr"> 95 </span>  <span class="PreProc">var</span> in-int/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L96" class="LineNr"> 96 </span>  <span class="Delimiter">{</span>
<span id="L97" class="LineNr"> 97 </span>    compare in-int, <span class="Constant">0x7f</span>
<span id="L98" class="LineNr"> 98 </span>    <span class="PreProc">break-if-&gt;</span>
<span id="L99" class="LineNr"> 99 </span>    <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy in-int
<span id="L100" class="LineNr">100 </span>    <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L22'>to-grapheme</a> in
<span id="L101" class="LineNr">101 </span>    <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L102" class="LineNr">102 </span>    <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, in-int, <span class="Constant">&quot;F - test-to-grapheme-single-byte&quot;</span>
<span id="L103" class="LineNr">103 </span>    in-int <span class="SpecialChar">&lt;-</span> increment
<span id="L104" class="LineNr">104 </span>    <span class="PreProc">loop</span>
<span id="L105" class="LineNr">105 </span>  <span class="Delimiter">}</span>
<span id="L106" class="LineNr">106 </span><span class="Delimiter">}</span>
<span id="L107" class="LineNr">107 </span>
<span id="L108" class="LineNr">108 </span>                                                              <span class="muComment"># byte       | byte      | byte      | byte</span>
<span id="L109" class="LineNr">109 </span><span class="muComment"># smallest 2-byte utf-8</span>
<span id="L110" class="LineNr">110 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L110'>test-to-grapheme-two-bytes-min</a></span> <span class="Delimiter">{</span>
<span id="L111" class="LineNr">111 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x80</span>                         <span class="muComment">#                                 10     00-0000</span>
<span id="L112" class="LineNr">112 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L22'>to-grapheme</a> in
<span id="L113" class="LineNr">113 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L114" class="LineNr">114 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0x80c2</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L22'>to-grapheme</a>/2a&quot;</span>      <span class="muComment">#                         110 0-0010  10 00-0000</span>
<span id="L115" class="LineNr">115 </span><span class="Delimiter">}</span>
<span id="L116" class="LineNr">116 </span>
<span id="L117" class="LineNr">117 </span><span class="muComment"># largest 2-byte utf-8</span>
<span id="L118" class="LineNr">118 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L118'>test-to-grapheme-two-bytes-max</a></span> <span class="Delimiter">{</span>
<span id="L119" class="LineNr">119 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x7ff</span>                        <span class="muComment">#                             1-1111     11-1111</span>
<span id="L120" class="LineNr">120 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L22'>to-grapheme</a> in
<span id="L121" class="LineNr">121 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L122" class="LineNr">122 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0xbfdf</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L22'>to-grapheme</a>/2b&quot;</span>      <span class="muComment">#                         110 1-1111  10 11-1111</span>
<span id="L123" class="LineNr">123 </span><span class="Delimiter">}</span>
<span id="L124" class="LineNr">124 </span>
<span id="L125" class="LineNr">125 </span><span class="muComment"># smallest 3-byte utf-8</span>
<span id="L126" class="LineNr">126 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L126'>test-to-grapheme-three-bytes-min</a></span> <span class="Delimiter">{</span>
<span id="L127" class="LineNr">127 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x800</span>                        <span class="muComment">#                            10-0000     00-0000</span>
<span id="L128" class="LineNr">128 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L22'>to-grapheme</a> in
<span id="L129" class="LineNr">129 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L130" class="LineNr">130 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0x80a0e0</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L22'>to-grapheme</a>/3a&quot;</span>    <span class="muComment">#              1110 0000  10 10-0000  10 00-0000</span>
<span id="L131" class="LineNr">131 </span><span class="Delimiter">}</span>
<span id="L132" class="LineNr">132 </span>
<span id="L133" class="LineNr">133 </span><span class="muComment"># largest 3-byte utf-8</span>
<span id="L134" class="LineNr">134 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L134'>test-to-grapheme-three-bytes-max</a></span> <span class="Delimiter">{</span>
<span id="L135" class="LineNr">135 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xffff</span>                       <span class="muComment">#                   1111     11-1111     11-1111</span>
<span id="L136" class="LineNr">136 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L22'>to-grapheme</a> in
<span id="L137" class="LineNr">137 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L138" class="LineNr">138 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0xbfbfef</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L22'>to-grapheme</a>/3b&quot;</span>    <span class="muComment">#              1110 1111  10 11-1111  10 11-1111</span>
<span id="L139" class="LineNr">139 </span><span class="Delimiter">}</span>
<span id="L140" class="LineNr">140 </span>
<span id="L141" class="LineNr">141 </span><span class="muComment"># smallest 4-byte utf-8</span>
<span id="L142" class="LineNr">142 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L142'>test-to-grapheme-four-bytes-min</a></span> <span class="Delimiter">{</span>
<span id="L143" class="LineNr">143 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x10000</span>                      <span class="muComment">#                 1-0000     00-0000     00-0000</span>
<span id="L144" class="LineNr">144 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L22'>to-grapheme</a> in
<span id="L145" class="LineNr">145 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L146" class="LineNr">146 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0x808090f0</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L22'>to-grapheme</a>/4a&quot;</span>  <span class="muComment"># 1111-0 000  10 01-0000  10 00-0000  10 00-0000</span>
<span id="L147" class="LineNr">147 </span><span class="Delimiter">}</span>
<span id="L148" class="LineNr">148 </span>
<span id="L149" class="LineNr">149 </span><span class="muComment"># largest 4-byte utf-8</span>
<span id="L150" class="LineNr">150 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L150'>test-to-grapheme-four-bytes-max</a></span> <span class="Delimiter">{</span>
<span id="L151" class="LineNr">151 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x1fffff</span>                     <span class="muComment">#        111     11-1111     11-1111     11-1111</span>
<span id="L152" class="LineNr">152 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L22'>to-grapheme</a> in
<span id="L153" class="LineNr">153 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L154" class="LineNr">154 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0xbfbfbff7</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L22'>to-grapheme</a>/4b&quot;</span>  <span class="muComment"># 1111-0 111  10 11-1111  10 11-1111  10 11-1111</span>
<span id="L155" class="LineNr">155 </span><span class="Delimiter">}</span>
<span id="L156" class="LineNr">156 </span>
<span id="L157" class="LineNr">157 </span><span class="muComment"># read the next grapheme from a stream of bytes</span>
<span id="L158" class="LineNr">158 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L158'>read-grapheme</a></span> in: (addr stream byte)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
<span id="L159" class="LineNr">159 </span>  <span class="muComment"># if at eof, return EOF</span>
<span id="L160" class="LineNr">160 </span>  <span class="Delimiter">{</span>
<span id="L161" class="LineNr">161 </span>    <span class="PreProc">var</span> eof?/<span class="Constant">eax</span>: boolean <span class="SpecialChar">&lt;-</span> <a href='309stream.subx.html#L6'>stream-empty?</a> in
<span id="L162" class="LineNr">162 </span>    compare eof?, <span class="Constant">0</span>  <span class="muComment"># false</span>
<span id="L163" class="LineNr">163 </span>    <span class="PreProc">break-if-=</span>
<span id="L164" class="LineNr">164 </span>    <span class="PreProc">return</span> <span class="Constant">0xffffffff</span>
<span id="L165" class="LineNr">165 </span>  <span class="Delimiter">}</span>
<span id="L166" class="LineNr">166 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: byte <span class="SpecialChar">&lt;-</span> <a href='112read-byte.subx.html#L273'>read-byte</a> in
<span id="L167" class="LineNr">167 </span>  <span class="PreProc">var</span> num-trailers/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L168" class="LineNr">168 </span>  $read-grapheme:compute-length: <span class="Delimiter">{</span>
<span id="L169" class="LineNr">169 </span>    <span class="muComment"># single byte: just return it</span>
<span id="L170" class="LineNr">170 </span>    compare c, <span class="Constant">0xc0</span>
<span id="L171" class="LineNr">171 </span>    <span class="Delimiter">{</span>
<span id="L172" class="LineNr">172 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L173" class="LineNr">173 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy c
<span id="L174" class="LineNr">174 </span>      <span class="PreProc">return</span> g
<span id="L175" class="LineNr">175 </span>    <span class="Delimiter">}</span>
<span id="L176" class="LineNr">176 </span>    compare c, <span class="Constant">0xfe</span>
<span id="L177" class="LineNr">177 </span>    <span class="Delimiter">{</span>
<span id="L178" class="LineNr">178 </span>      <span class="PreProc">break-if-&lt;</span>
<span id="L179" class="LineNr">179 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy c
<span id="L180" class="LineNr">180 </span>      <span class="PreProc">return</span> g
<span id="L181" class="LineNr">181 </span>    <span class="Delimiter">}</span>
<span id="L182" class="LineNr">182 </span>    <span class="muComment"># 2 bytes</span>
<span id="L183" class="LineNr">183 </span>    compare c, <span class="Constant">0xe0</span>
<span id="L184" class="LineNr">184 </span>    <span class="Delimiter">{</span>
<span id="L185" class="LineNr">185 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L186" class="LineNr">186 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L187" class="LineNr">187 </span>      <span class="PreProc">break</span> $read-grapheme:compute-length
<span id="L188" class="LineNr">188 </span>    <span class="Delimiter">}</span>
<span id="L189" class="LineNr">189 </span>    <span class="muComment"># 3 bytes</span>
<span id="L190" class="LineNr">190 </span>    compare c, <span class="Constant">0xf0</span>
<span id="L191" class="LineNr">191 </span>    <span class="Delimiter">{</span>
<span id="L192" class="LineNr">192 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L193" class="LineNr">193 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">2</span>
<span id="L194" class="LineNr">194 </span>      <span class="PreProc">break</span> $read-grapheme:compute-length
<span id="L195" class="LineNr">195 </span>    <span class="Delimiter">}</span>
<span id="L196" class="LineNr">196 </span>    <span class="muComment"># 4 bytes</span>
<span id="L197" class="LineNr">197 </span>    compare c, <span class="Constant">0xf8</span>
<span id="L198" class="LineNr">198 </span>    <span class="Delimiter">{</span>
<span id="L199" class="LineNr">199 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L200" class="LineNr">200 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">3</span>
<span id="L201" class="LineNr">201 </span>      <span class="PreProc">break</span> $read-grapheme:compute-length
<span id="L202" class="LineNr">202 </span>    <span class="Delimiter">}</span>
<span id="L203" class="LineNr">203 </span>$read-grapheme:abort: <span class="Delimiter">{</span>
<span id="L204" class="LineNr">204 </span>      <span class="muComment"># TODO: print to stderr</span>
<span id="L205" class="LineNr">205 </span>      <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">&quot;utf-8 encodings larger than 4 bytes are not supported. First byte seen: &quot;</span>
<span id="L206" class="LineNr">206 </span>      <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L207" class="LineNr">207 </span>      <a href='304screen.subx.html#L226'>print-int32-hex-to-real-screen</a> n
<span id="L208" class="LineNr">208 </span>      <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">&quot;\n&quot;</span>
<span id="L209" class="LineNr">209 </span>      <span class="PreProc">var</span> exit-status/<span class="Constant">ebx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L210" class="LineNr">210 </span>      syscall_exit
<span id="L211" class="LineNr">211 </span>    <span class="Delimiter">}</span>
<span id="L212" class="LineNr">212 </span>  <span class="Delimiter">}</span>
<span id="L213" class="LineNr">213 </span>  <span class="muComment"># prepend trailer bytes</span>
<span id="L214" class="LineNr">214 </span>  <span class="PreProc">var</span> result/<span class="Constant">edi</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L215" class="LineNr">215 </span>  <span class="PreProc">var</span> num-byte-shifts/<span class="Constant">edx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L216" class="LineNr">216 </span>  <span class="Delimiter">{</span>
<span id="L217" class="LineNr">217 </span>    compare num-trailers, <span class="Constant">0</span>
<span id="L218" class="LineNr">218 </span>    <span class="PreProc">break-if-&lt;=</span>
<span id="L219" class="LineNr">219 </span>    <span class="PreProc">var</span> tmp/<span class="Constant">eax</span>: byte <span class="SpecialChar">&lt;-</span> <a href='112read-byte.subx.html#L273'>read-byte</a> in
<span id="L220" class="LineNr">220 </span>    <span class="PreProc">var</span> tmp2/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy tmp
<span id="L221" class="LineNr">221 </span>    tmp2 <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L325'>shift-left-bytes</a> tmp2, num-byte-shifts
<span id="L222" class="LineNr">222 </span>    result <span class="SpecialChar">&lt;-</span> or tmp2
<span id="L223" class="LineNr">223 </span>    <span class="muComment"># update loop state</span>
<span id="L224" class="LineNr">224 </span>    num-byte-shifts <span class="SpecialChar">&lt;-</span> increment
<span id="L225" class="LineNr">225 </span>    num-trailers <span class="SpecialChar">&lt;-</span> decrement
<span id="L226" class="LineNr">226 </span>    <span class="PreProc">loop</span>
<span id="L227" class="LineNr">227 </span>  <span class="Delimiter">}</span>
<span id="L228" class="LineNr">228 </span>  <span class="PreProc">return</span> result
<span id="L229" class="LineNr">229 </span><span class="Delimiter">}</span>
<span id="L230" class="LineNr">230 </span>
<span id="L231" class="LineNr">231 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L231'>test-read-grapheme</a></span> <span class="Delimiter">{</span>
<span id="L232" class="LineNr">232 </span>  <span class="PreProc">var</span> s: (stream byte <span class="Constant">0x30</span>)
<span id="L233" class="LineNr">233 </span>  <span class="PreProc">var</span> s2/<span class="Constant">ecx</span>: (addr stream byte) <span class="SpecialChar">&lt;-</span> address s
<span id="L234" class="LineNr">234 </span>  <a href='108write.subx.html#L24'>write</a> s2, <span class="Constant">&quot;aΒc世d界e&quot;</span>
<span id="L235" class="LineNr">235 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> s2
<span id="L236" class="LineNr">236 </span>  <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L237" class="LineNr">237 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> n, <span class="Constant">0x61</span>, <span class="Constant">&quot;F - test grapheme/0&quot;</span>
<span id="L238" class="LineNr">238 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> s2
<span id="L239" class="LineNr">239 </span>  <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L240" class="LineNr">240 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> n, <span class="Constant">0x92ce</span>, <span class="Constant">&quot;F - test grapheme/1&quot;</span>  <span class="muComment"># greek capital letter beta</span>
<span id="L241" class="LineNr">241 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> s2
<span id="L242" class="LineNr">242 </span>  <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L243" class="LineNr">243 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> n, <span class="Constant">0x63</span>, <span class="Constant">&quot;F - test grapheme/2&quot;</span>
<span id="L244" class="LineNr">244 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> s2
<span id="L245" class="LineNr">245 </span>  <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L246" class="LineNr">246 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> n, <span class="Constant">0x96b8e4</span>, <span class="Constant">&quot;F - test grapheme/3&quot;</span>
<span id="L247" class="LineNr">247 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> s2
<span id="L248" class="LineNr">248 </span>  <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L249" class="LineNr">249 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> n, <span class="Constant">0x64</span>, <span class="Constant">&quot;F - test grapheme/4&quot;</span>
<span id="L250" class="LineNr">250 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> s2
<span id="L251" class="LineNr">251 </span>  <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L252" class="LineNr">252 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> n, <span class="Constant">0x8c95e7</span>, <span class="Constant">&quot;F - test grapheme/5&quot;</span>
<span id="L253" class="LineNr">253 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> s2
<span id="L254" class="LineNr">254 </span>  <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L255" class="LineNr">255 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> n, <span class="Constant">0x65</span>, <span class="Constant">&quot;F - test grapheme/6&quot;</span>
<span id="L256" class="LineNr">256 </span><span class="Delimiter">}</span>
<span id="L257" class="LineNr">257 </span>
<span id="L258" class="LineNr">258 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L258'>read-grapheme-buffered</a></span> in: (addr buffered-file)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
<span id="L259" class="LineNr">259 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: byte <span class="SpecialChar">&lt;-</span> <a href='112read-byte.subx.html#L38'>read-byte-buffered</a> in
<span id="L260" class="LineNr">260 </span>  <span class="PreProc">var</span> num-trailers/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L261" class="LineNr">261 </span>  $read-grapheme-buffered:compute-length: <span class="Delimiter">{</span>
<span id="L262" class="LineNr">262 </span>    <span class="muComment"># single byte: just return it</span>
<span id="L263" class="LineNr">263 </span>    compare c, <span class="Constant">0xc0</span>
<span id="L264" class="LineNr">264 </span>    <span class="Delimiter">{</span>
<span id="L265" class="LineNr">265 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L266" class="LineNr">266 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy c
<span id="L267" class="LineNr">267 </span>      <span class="PreProc">return</span> g
<span id="L268" class="LineNr">268 </span>    <span class="Delimiter">}</span>
<span id="L269" class="LineNr">269 </span>    compare c, <span class="Constant">0xfe</span>
<span id="L270" class="LineNr">270 </span>    <span class="Delimiter">{</span>
<span id="L271" class="LineNr">271 </span>      <span class="PreProc">break-if-&lt;</span>
<span id="L272" class="LineNr">272 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy c
<span id="L273" class="LineNr">273 </span>      <span class="PreProc">return</span> g
<span id="L274" class="LineNr">274 </span>    <span class="Delimiter">}</span>
<span id="L275" class="LineNr">275 </span>    <span class="muComment"># 2 bytes</span>
<span id="L276" class="LineNr">276 </span>    compare c, <span class="Constant">0xe0</span>
<span id="L277" class="LineNr">277 </span>    <span class="Delimiter">{</span>
<span id="L278" class="LineNr">278 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L279" class="LineNr">279 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L280" class="LineNr">280 </span>      <span class="PreProc">break</span> $read-grapheme-buffered:compute-length
<span id="L281" class="LineNr">281 </span>    <span class="Delimiter">}</span>
<span id="L282" class="LineNr">282 </span>    <span class="muComment"># 3 bytes</span>
<span id="L283" class="LineNr">283 </span>    compare c, <span class="Constant">0xf0</span>
<span id="L284" class="LineNr">284 </span>    <span class="Delimiter">{</span>
<span id="L285" class="LineNr">285 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L286" class="LineNr">286 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">2</span>
<span id="L287" class="LineNr">287 </span>      <span class="PreProc">break</span> $read-grapheme-buffered:compute-length
<span id="L288" class="LineNr">288 </span>    <span class="Delimiter">}</span>
<span id="L289" class="LineNr">289 </span>    <span class="muComment"># 4 bytes</span>
<span id="L290" class="LineNr">290 </span>    compare c, <span class="Constant">0xf8</span>
<span id="L291" class="LineNr">291 </span>    <span class="Delimiter">{</span>
<span id="L292" class="LineNr">292 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L293" class="LineNr">293 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">3</span>
<span id="L294" class="LineNr">294 </span>      <span class="PreProc">break</span> $read-grapheme-buffered:compute-length
<span id="L295" class="LineNr">295 </span>    <span class="Delimiter">}</span>
<span id="L296" class="LineNr">296 </span>$read-grapheme-buffered:abort: <span class="Delimiter">{</span>
<span id="L297" class="LineNr">297 </span>      <span class="muComment"># TODO: print to stderr</span>
<span id="L298" class="LineNr">298 </span>      <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">&quot;utf-8 encodings larger than 4 bytes are not supported. First byte seen: &quot;</span>
<span id="L299" class="LineNr">299 </span>      <span class="PreProc">var</span> n/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L300" class="LineNr">300 </span>      <a href='304screen.subx.html#L226'>print-int32-hex-to-real-screen</a> n
<span id="L301" class="LineNr">301 </span>      <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">&quot;\n&quot;</span>
<span id="L302" class="LineNr">302 </span>      <span class="PreProc">var</span> exit-status/<span class="Constant">ebx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L303" class="LineNr">303 </span>      syscall_exit
<span id="L304" class="LineNr">304 </span>    <span class="Delimiter">}</span>
<span id="L305" class="LineNr">305 </span>  <span class="Delimiter">}</span>
<span id="L306" class="LineNr">306 </span>  <span class="muComment"># prepend trailer bytes</span>
<span id="L307" class="LineNr">307 </span>  <span class="PreProc">var</span> result/<span class="Constant">edi</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L308" class="LineNr">308 </span>  <span class="PreProc">var</span> num-byte-shifts/<span class="Constant">edx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L309" class="LineNr">309 </span>  <span class="Delimiter">{</span>
<span id="L310" class="LineNr">310 </span>    compare num-trailers, <span class="Constant">0</span>
<span id="L311" class="LineNr">311 </span>    <span class="PreProc">break-if-&lt;=</span>
<span id="L312" class="LineNr">312 </span>    <span class="PreProc">var</span> tmp/<span class="Constant">eax</span>: byte <span class="SpecialChar">&lt;-</span> <a href='112read-byte.subx.html#L38'>read-byte-buffered</a> in
<span id="L313" class="LineNr">313 </span>    <span class="PreProc">var</span> tmp2/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy tmp
<span id="L314" class="LineNr">314 </span>    tmp2 <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L325'>shift-left-bytes</a> tmp2, num-byte-shifts
<span id="L315" class="LineNr">315 </span>    result <span class="SpecialChar">&lt;-</span> or tmp2
<span id="L316" class="LineNr">316 </span>    <span class="muComment"># update loop state</span>
<span id="L317" class="LineNr">317 </span>    num-byte-shifts <span class="SpecialChar">&lt;-</span> increment
<span id="L318" class="LineNr">318 </span>    num-trailers <span class="SpecialChar">&lt;-</span> decrement
<span id="L319" class="LineNr">319 </span>    <span class="PreProc">loop</span>
<span id="L320" class="LineNr">320 </span>  <span class="Delimiter">}</span>
<span id="L321" class="LineNr">321 </span>  <span class="PreProc">return</span> result
<span id="L322" class="LineNr">322 </span><span class="Delimiter">}</span>
<span id="L323" class="LineNr">323 </span>
<span id="L324" class="LineNr">324 </span><span class="muComment"># needed because available primitives only shift by a literal/constant number of bits</span>
<span id="L325" class="LineNr">325 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L325'>shift-left-bytes</a></span> n: int, k: int<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
<span id="L326" class="LineNr">326 </span>  <span class="PreProc">var</span> i/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L327" class="LineNr">327 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy n
<span id="L328" class="LineNr">328 </span>  <span class="Delimiter">{</span>
<span id="L329" class="LineNr">329 </span>    compare i, k
<span id="L330" class="LineNr">330 </span>    <span class="PreProc">break-if-&gt;=</span>
<span id="L331" class="LineNr">331 </span>    compare i, <span class="Constant">4</span>  <span class="muComment"># only 4 bytes in 32 bits</span>
<span id="L332" class="LineNr">332 </span>    <span class="PreProc">break-if-&gt;=</span>
<span id="L333" class="LineNr">333 </span>    result <span class="SpecialChar">&lt;-</span> shift-left <span class="Constant">8</span>
<span id="L334" class="LineNr">334 </span>    i <span class="SpecialChar">&lt;-</span> increment
<span id="L335" class="LineNr">335 </span>    <span class="PreProc">loop</span>
<span id="L336" class="LineNr">336 </span>  <span class="Delimiter">}</span>
<span id="L337" class="LineNr">337 </span>  <span class="PreProc">return</span> result
<span id="L338" class="LineNr">338 </span><span class="Delimiter">}</span>
<span id="L339" class="LineNr">339 </span>
<span id="L340" class="LineNr">340 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L340'>test-shift-left-bytes-0</a></span> <span class="Delimiter">{</span>
<span id="L341" class="LineNr">341 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L325'>shift-left-bytes</a> <span class="Constant">1</span>, <span class="Constant">0</span>
<span id="L342" class="LineNr">342 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">1</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L325'>shift-left-bytes</a> 0&quot;</span>
<span id="L343" class="LineNr">343 </span><span class="Delimiter">}</span>
<span id="L344" class="LineNr">344 </span>
<span id="L345" class="LineNr">345 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L345'>test-shift-left-bytes-1</a></span> <span class="Delimiter">{</span>
<span id="L346" class="LineNr">346 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L325'>shift-left-bytes</a> <span class="Constant">1</span>, <span class="Constant">1</span>
<span id="L347" class="LineNr">347 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">0x100</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L325'>shift-left-bytes</a> 1&quot;</span>
<span id="L348" class="LineNr">348 </span><span class="Delimiter">}</span>
<span id="L349" class="LineNr">349 </span>
<span id="L350" class="LineNr">350 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L350'>test-shift-left-bytes-2</a></span> <span class="Delimiter">{</span>
<span id="L351" class="LineNr">351 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L325'>shift-left-bytes</a> <span class="Constant">1</span>, <span class="Constant">2</span>
<span id="L352" class="LineNr">352 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">0x10000</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L325'>shift-left-bytes</a> 2&quot;</span>
<span id="L353" class="LineNr">353 </span><span class="Delimiter">}</span>
<span id="L354" class="LineNr">354 </span>
<span id="L355" class="LineNr">355 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L355'>test-shift-left-bytes-3</a></span> <span class="Delimiter">{</span>
<span id="L356" class="LineNr">356 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L325'>shift-left-bytes</a> <span class="Constant">1</span>, <span class="Constant">3</span>
<span id="L357" class="LineNr">357 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">0x1000000</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L325'>shift-left-bytes</a> 3&quot;</span>
<span id="L358" class="LineNr">358 </span><span class="Delimiter">}</span>
<span id="L359" class="LineNr">359 </span>
<span id="L360" class="LineNr">360 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L360'>test-shift-left-bytes-4</a></span> <span class="Delimiter">{</span>
<span id="L361" class="LineNr">361 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L325'>shift-left-bytes</a> <span class="Constant">1</span>, <span class="Constant">4</span>
<span id="L362" class="LineNr">362 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">0</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L325'>shift-left-bytes</a> 4&quot;</span>
<span id="L363" class="LineNr">363 </span><span class="Delimiter">}</span>
<span id="L364" class="LineNr">364 </span>
<span id="L365" class="LineNr">365 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403unicode.mu.html#L365'>test-shift-left-bytes-5</a></span> <span class="Delimiter">{</span>
<span id="L366" class="LineNr">366 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> <a href='403unicode.mu.html#L325'>shift-left-bytes</a> <span class="Constant">1</span>, <span class="Constant">5</span>
<span id="L367" class="LineNr">367 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">0</span>, <span class="Constant">&quot;F - <a href='403unicode.mu.html#L325'>shift-left-bytes</a> &gt;4&quot;</span>
<span id="L368" class="LineNr">368 </span><span class="Delimiter">}</span>
<span id="L369" class="LineNr">369 </span>
<span id="L370" class="LineNr">370 </span><span class="muComment"># To run all tests, uncomment this and run:</span>
<span id="L371" class="LineNr">371 </span><span class="muComment">#   $ ./translate_mu  &amp;&amp;  ./a.elf</span>
<span id="L372" class="LineNr">372 </span><span class="CommentedCode">#? fn main -&gt; r/ebx: int {</span>
<span id="L373" class="LineNr">373 </span><span class="CommentedCode">#?   run-tests</span>
<span id="L374" class="LineNr">374 </span><span class="CommentedCode">#?   r &lt;- copy 0</span>
<span id="L375" class="LineNr">375 </span><span class="CommentedCode">#? }</span>
<span id="L376" class="LineNr">376 </span>
<span id="L377" class="LineNr">377 </span><span class="muComment"># write a grapheme to a stream of bytes</span>
<span id="L378" class="LineNr">378 </span><span class="muComment"># this is like write-to-stream, except we skip leading 0 bytes</span>
<span id="L379" class="LineNr">379 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L379'>write-grapheme</a></span> out: (addr stream byte), g: grapheme <span class="Delimiter">{</span>
<span id="L380" class="LineNr">380 </span>$write-grapheme:body: <span class="Delimiter">{</span>
<span id="L381" class="LineNr">381 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy g
<span id="L382" class="LineNr">382 </span>  <a href='115write-byte.subx.html#L208'>append-byte</a> out, c  <span class="muComment"># first byte is always written</span>
<span id="L383" class="LineNr">383 </span>  c <span class="SpecialChar">&lt;-</span> shift-right <span class="Constant">8</span>
<span id="L384" class="LineNr">384 </span>  compare c, <span class="Constant">0</span>
<span id="L385" class="LineNr">385 </span>  <span class="PreProc">break-if-=</span> $write-grapheme:body
<span id="L386" class="LineNr">386 </span>  <a href='115write-byte.subx.html#L208'>append-byte</a> out, c
<span id="L387" class="LineNr">387 </span>  c <span class="SpecialChar">&lt;-</span> shift-right <span class="Constant">8</span>
<span id="L388" class="LineNr">388 </span>  compare c, <span class="Constant">0</span>
<span id="L389" class="LineNr">389 </span>  <span class="PreProc">break-if-=</span> $write-grapheme:body
<span id="L390" class="LineNr">390 </span>  <a href='115write-byte.subx.html#L208'>append-byte</a> out, c
<span id="L391" class="LineNr">391 </span>  c <span class="SpecialChar">&lt;-</span> shift-right <span class="Constant">8</span>
<span id="L392" class="LineNr">392 </span>  compare c, <span class="Constant">0</span>
<span id="L393" class="LineNr">393 </span>  <span class="PreProc">break-if-=</span> $write-grapheme:body
<span id="L394" class="LineNr">394 </span>  <a href='115write-byte.subx.html#L208'>append-byte</a> out, c
<span id="L395" class="LineNr">395 </span><span class="Delimiter">}</span>
<span id="L396" class="LineNr">396 </span><span class="Delimiter">}</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->