summaryrefslogtreecommitdiff
path: root/src/hb-ot-shape-complex-vowel-constraints.cc
blob: 919c0305b1992e181bc3173ad8584038aeb9e8a2 (plain)
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
/* == Start of generated functions == */
/*
 * The following functions are generated by running:
 *
 *   ./gen-vowel-constraints.py use Scripts.txt
 *
 * on files with these headers:
 *
 * # Copied from https://docs.microsoft.com/en-us/typography/script-development/use
 * # On October 23, 2018; with documentd dated 02/07/2018.
 *
 * # Scripts-12.0.0.txt
 * # Date: 2019-01-28, 22:16:47 GMT
 */

#include "hb-ot-shape-complex-vowel-constraints.hh"

static void
_output_dotted_circle (hb_buffer_t *buffer)
{
  hb_glyph_info_t &dottedcircle = buffer->output_glyph (0x25CCu);
  _hb_glyph_info_reset_continuation (&dottedcircle);
}

static void
_output_with_dotted_circle (hb_buffer_t *buffer)
{
  _output_dotted_circle (buffer);
  buffer->next_glyph ();
}

void
_hb_preprocess_text_vowel_constraints (const hb_ot_shape_plan_t *plan HB_UNUSED,
				       hb_buffer_t              *buffer,
				       hb_font_t                *font HB_UNUSED)
{
  if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE))
    return;

  /* UGLY UGLY UGLY business of adding dotted-circle in the middle of
   * vowel-sequences that look like another vowel.  Data for each script
   * collected from the USE script development spec.
   *
   * https://github.com/harfbuzz/harfbuzz/issues/1019
   */
  bool processed = false;
  buffer->clear_output ();
  unsigned int count = buffer->len;
  switch ((unsigned) buffer->props.script)
  {
    case HB_SCRIPT_DEVANAGARI:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x0905u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x093Au: case 0x093Bu: case 0x093Eu: case 0x0945u:
	      case 0x0946u: case 0x0949u: case 0x094Au: case 0x094Bu:
	      case 0x094Cu: case 0x094Fu: case 0x0956u: case 0x0957u:
		matched = true;
		break;
	    }
	    break;
	  case 0x0906u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x093Au: case 0x0945u: case 0x0946u: case 0x0947u:
	      case 0x0948u:
		matched = true;
		break;
	    }
	    break;
	  case 0x0909u:
	    matched = 0x0941u == buffer->cur (1).codepoint;
	    break;
	  case 0x090Fu:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x0945u: case 0x0946u: case 0x0947u:
		matched = true;
		break;
	    }
	    break;
	  case 0x0930u:
	    if (0x094Du == buffer->cur (1).codepoint &&
		buffer->idx + 2 < count &&
		0x0907u == buffer->cur (2).codepoint)
	    {
	      buffer->next_glyph ();
	      buffer->next_glyph ();
	      _output_dotted_circle (buffer);
	    }
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_BENGALI:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x0985u:
	    matched = 0x09BEu == buffer->cur (1).codepoint;
	    break;
	  case 0x098Bu:
	    matched = 0x09C3u == buffer->cur (1).codepoint;
	    break;
	  case 0x098Cu:
	    matched = 0x09E2u == buffer->cur (1).codepoint;
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_GURMUKHI:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x0A05u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x0A3Eu: case 0x0A48u: case 0x0A4Cu:
		matched = true;
		break;
	    }
	    break;
	  case 0x0A72u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x0A3Fu: case 0x0A40u: case 0x0A47u:
		matched = true;
		break;
	    }
	    break;
	  case 0x0A73u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x0A41u: case 0x0A42u: case 0x0A4Bu:
		matched = true;
		break;
	    }
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_GUJARATI:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x0A85u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x0ABEu: case 0x0AC5u: case 0x0AC7u: case 0x0AC8u:
	      case 0x0AC9u: case 0x0ACBu: case 0x0ACCu:
		matched = true;
		break;
	    }
	    break;
	  case 0x0AC5u:
	    matched = 0x0ABEu == buffer->cur (1).codepoint;
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_ORIYA:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x0B05u:
	    matched = 0x0B3Eu == buffer->cur (1).codepoint;
	    break;
	  case 0x0B0Fu: case 0x0B13u:
	    matched = 0x0B57u == buffer->cur (1).codepoint;
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_TELUGU:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x0C12u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x0C4Cu: case 0x0C55u:
		matched = true;
		break;
	    }
	    break;
	  case 0x0C3Fu: case 0x0C46u: case 0x0C4Au:
	    matched = 0x0C55u == buffer->cur (1).codepoint;
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_KANNADA:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x0C89u: case 0x0C8Bu:
	    matched = 0x0CBEu == buffer->cur (1).codepoint;
	    break;
	  case 0x0C92u:
	    matched = 0x0CCCu == buffer->cur (1).codepoint;
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_MALAYALAM:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x0D07u: case 0x0D09u:
	    matched = 0x0D57u == buffer->cur (1).codepoint;
	    break;
	  case 0x0D0Eu:
	    matched = 0x0D46u == buffer->cur (1).codepoint;
	    break;
	  case 0x0D12u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x0D3Eu: case 0x0D57u:
		matched = true;
		break;
	    }
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_SINHALA:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x0D85u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x0DCFu: case 0x0DD0u: case 0x0DD1u:
		matched = true;
		break;
	    }
	    break;
	  case 0x0D8Bu: case 0x0D8Fu: case 0x0D94u:
	    matched = 0x0DDFu == buffer->cur (1).codepoint;
	    break;
	  case 0x0D8Du:
	    matched = 0x0DD8u == buffer->cur (1).codepoint;
	    break;
	  case 0x0D91u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x0DCAu: case 0x0DD9u: case 0x0DDAu: case 0x0DDCu:
	      case 0x0DDDu:
		matched = true;
		break;
	    }
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_BRAHMI:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x11005u:
	    matched = 0x11038u == buffer->cur (1).codepoint;
	    break;
	  case 0x1100Bu:
	    matched = 0x1103Eu == buffer->cur (1).codepoint;
	    break;
	  case 0x1100Fu:
	    matched = 0x11042u == buffer->cur (1).codepoint;
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_KHUDAWADI:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x112B0u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x112E0u: case 0x112E5u: case 0x112E6u: case 0x112E7u:
	      case 0x112E8u:
		matched = true;
		break;
	    }
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_TIRHUTA:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x11481u:
	    matched = 0x114B0u == buffer->cur (1).codepoint;
	    break;
	  case 0x1148Bu: case 0x1148Du:
	    matched = 0x114BAu == buffer->cur (1).codepoint;
	    break;
	  case 0x114AAu:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x114B5u: case 0x114B6u:
		matched = true;
		break;
	    }
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_MODI:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x11600u: case 0x11601u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x11639u: case 0x1163Au:
		matched = true;
		break;
	    }
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    case HB_SCRIPT_TAKRI:
      for (buffer->idx = 0; buffer->idx + 1 < count && buffer->successful;)
      {
	bool matched = false;
	switch (buffer->cur ().codepoint)
	{
	  case 0x11680u:
	    switch (buffer->cur (1).codepoint)
	    {
	      case 0x116ADu: case 0x116B4u: case 0x116B5u:
		matched = true;
		break;
	    }
	    break;
	  case 0x11686u:
	    matched = 0x116B2u == buffer->cur (1).codepoint;
	    break;
	}
	buffer->next_glyph ();
	if (matched) _output_with_dotted_circle (buffer);
      }
      processed = true;
      break;

    default:
      break;
  }
  if (processed)
  {
    if (buffer->idx < count)
      buffer->next_glyph ();
    buffer->swap_buffers ();
  }
}

/* == End of generated functions == */