summaryrefslogtreecommitdiff
path: root/macros/luatex/generic/luatexko/luatexko-normalize.lua
blob: 41e5d3498d62557ad4852cbaed2535dcbddd712c (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
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
-- luatexko-normalize.lua
--
-- Copyright (c) 2013-2020  Dohyun Kim  <nomos at ktug org>
--                          Soojin Nam  <jsunam at gmail com>
--
-- This work may be distributed and/or modified under the
-- conditions of the LaTeX Project Public License, either version 1.3c
-- of this license or (at your option) any later version.
-- The latest version of this license is in
--   http://www.latex-project.org/lppl.txt
-- and version 1.3c or later is part of all distributions of LaTeX
-- version 2006/05/20 or later.

luatexbase.provides_module({
  name        = "luatexko-normalize",
  version     = "2.6",
  date        = "2020/02/17",
  author      = "Dohyun Kim, Soojin Nam",
  description = "Hangul normalization",
  license     = "LPPL v1.3+",
})

luatexko = luatexko or {}
luatexko.normalize = luatexko.normalize or {}
local luatexkonormalize = luatexko.normalize

local utf8codes   = utf8.codes
local utf8char    = utf8.char
local tableinsert = table.insert
local tableappend = table.append
local tableunpack = table.unpack

local chanjatohanja = {
  [0xF900] = {0x8C48, 0xFE00},
  [0xF901] = {0x66F4, 0xFE00},
  [0xF902] = {0x8ECA, 0xFE00},
  [0xF903] = {0x8CC8, 0xFE00},
  [0xF904] = {0x6ED1, 0xFE00},
  [0xF905] = {0x4E32, 0xFE00},
  [0xF906] = {0x53E5, 0xFE00},
  [0xF907] = {0x9F9C, 0xFE00},
  [0xF908] = {0x9F9C, 0xFE01},
  [0xF909] = {0x5951, 0xFE00},
  [0xF90A] = {0x91D1, 0xFE00},
  [0xF90B] = {0x5587, 0xFE00},
  [0xF90C] = {0x5948, 0xFE00},
  [0xF90D] = {0x61F6, 0xFE00},
  [0xF90E] = {0x7669, 0xFE00},
  [0xF90F] = {0x7F85, 0xFE00},
  [0xF910] = {0x863F, 0xFE00},
  [0xF911] = {0x87BA, 0xFE00},
  [0xF912] = {0x88F8, 0xFE00},
  [0xF913] = {0x908F, 0xFE00},
  [0xF914] = {0x6A02, 0xFE00},
  [0xF915] = {0x6D1B, 0xFE00},
  [0xF916] = {0x70D9, 0xFE00},
  [0xF917] = {0x73DE, 0xFE00},
  [0xF918] = {0x843D, 0xFE00},
  [0xF919] = {0x916A, 0xFE00},
  [0xF91A] = {0x99F1, 0xFE00},
  [0xF91B] = {0x4E82, 0xFE00},
  [0xF91C] = {0x5375, 0xFE00},
  [0xF91D] = {0x6B04, 0xFE00},
  [0xF91E] = {0x721B, 0xFE00},
  [0xF91F] = {0x862D, 0xFE00},
  [0xF920] = {0x9E1E, 0xFE00},
  [0xF921] = {0x5D50, 0xFE00},
  [0xF922] = {0x6FEB, 0xFE00},
  [0xF923] = {0x85CD, 0xFE00},
  [0xF924] = {0x8964, 0xFE00},
  [0xF925] = {0x62C9, 0xFE00},
  [0xF926] = {0x81D8, 0xFE00},
  [0xF927] = {0x881F, 0xFE00},
  [0xF928] = {0x5ECA, 0xFE00},
  [0xF929] = {0x6717, 0xFE00},
  [0xF92A] = {0x6D6A, 0xFE00},
  [0xF92B] = {0x72FC, 0xFE00},
  [0xF92C] = {0x90CE, 0xFE00},
  [0xF92D] = {0x4F86, 0xFE00},
  [0xF92E] = {0x51B7, 0xFE00},
  [0xF92F] = {0x52DE, 0xFE00},
  [0xF930] = {0x64C4, 0xFE00},
  [0xF931] = {0x6AD3, 0xFE00},
  [0xF932] = {0x7210, 0xFE00},
  [0xF933] = {0x76E7, 0xFE00},
  [0xF934] = {0x8001, 0xFE00},
  [0xF935] = {0x8606, 0xFE00},
  [0xF936] = {0x865C, 0xFE00},
  [0xF937] = {0x8DEF, 0xFE00},
  [0xF938] = {0x9732, 0xFE00},
  [0xF939] = {0x9B6F, 0xFE00},
  [0xF93A] = {0x9DFA, 0xFE00},
  [0xF93B] = {0x788C, 0xFE00},
  [0xF93C] = {0x797F, 0xFE00},
  [0xF93D] = {0x7DA0, 0xFE00},
  [0xF93E] = {0x83C9, 0xFE00},
  [0xF93F] = {0x9304, 0xFE00},
  [0xF940] = {0x9E7F, 0xFE00},
  [0xF941] = {0x8AD6, 0xFE00},
  [0xF942] = {0x58DF, 0xFE00},
  [0xF943] = {0x5F04, 0xFE00},
  [0xF944] = {0x7C60, 0xFE00},
  [0xF945] = {0x807E, 0xFE00},
  [0xF946] = {0x7262, 0xFE00},
  [0xF947] = {0x78CA, 0xFE00},
  [0xF948] = {0x8CC2, 0xFE00},
  [0xF949] = {0x96F7, 0xFE00},
  [0xF94A] = {0x58D8, 0xFE00},
  [0xF94B] = {0x5C62, 0xFE00},
  [0xF94C] = {0x6A13, 0xFE00},
  [0xF94D] = {0x6DDA, 0xFE00},
  [0xF94E] = {0x6F0F, 0xFE00},
  [0xF94F] = {0x7D2F, 0xFE00},
  [0xF950] = {0x7E37, 0xFE00},
  [0xF951] = {0x964B, 0xFE00},
  [0xF952] = {0x52D2, 0xFE00},
  [0xF953] = {0x808B, 0xFE00},
  [0xF954] = {0x51DC, 0xFE00},
  [0xF955] = {0x51CC, 0xFE00},
  [0xF956] = {0x7A1C, 0xFE00},
  [0xF957] = {0x7DBE, 0xFE00},
  [0xF958] = {0x83F1, 0xFE00},
  [0xF959] = {0x9675, 0xFE00},
  [0xF95A] = {0x8B80, 0xFE00},
  [0xF95B] = {0x62CF, 0xFE00},
  [0xF95C] = {0x6A02, 0xFE01},
  [0xF95D] = {0x8AFE, 0xFE00},
  [0xF95E] = {0x4E39, 0xFE00},
  [0xF95F] = {0x5BE7, 0xFE00},
  [0xF960] = {0x6012, 0xFE00},
  [0xF961] = {0x7387, 0xFE00},
  [0xF962] = {0x7570, 0xFE00},
  [0xF963] = {0x5317, 0xFE00},
  [0xF964] = {0x78FB, 0xFE00},
  [0xF965] = {0x4FBF, 0xFE00},
  [0xF966] = {0x5FA9, 0xFE00},
  [0xF967] = {0x4E0D, 0xFE00},
  [0xF968] = {0x6CCC, 0xFE00},
  [0xF969] = {0x6578, 0xFE00},
  [0xF96A] = {0x7D22, 0xFE00},
  [0xF96B] = {0x53C3, 0xFE00},
  [0xF96C] = {0x585E, 0xFE00},
  [0xF96D] = {0x7701, 0xFE00},
  [0xF96E] = {0x8449, 0xFE00},
  [0xF96F] = {0x8AAA, 0xFE00},
  [0xF970] = {0x6BBA, 0xFE00},
  [0xF971] = {0x8FB0, 0xFE00},
  [0xF972] = {0x6C88, 0xFE00},
  [0xF973] = {0x62FE, 0xFE00},
  [0xF974] = {0x82E5, 0xFE00},
  [0xF975] = {0x63A0, 0xFE00},
  [0xF976] = {0x7565, 0xFE00},
  [0xF977] = {0x4EAE, 0xFE00},
  [0xF978] = {0x5169, 0xFE00},
  [0xF979] = {0x51C9, 0xFE00},
  [0xF97A] = {0x6881, 0xFE00},
  [0xF97B] = {0x7CE7, 0xFE00},
  [0xF97C] = {0x826F, 0xFE00},
  [0xF97D] = {0x8AD2, 0xFE00},
  [0xF97E] = {0x91CF, 0xFE00},
  [0xF97F] = {0x52F5, 0xFE00},
  [0xF980] = {0x5442, 0xFE00},
  [0xF981] = {0x5973, 0xFE00},
  [0xF982] = {0x5EEC, 0xFE00},
  [0xF983] = {0x65C5, 0xFE00},
  [0xF984] = {0x6FFE, 0xFE00},
  [0xF985] = {0x792A, 0xFE00},
  [0xF986] = {0x95AD, 0xFE00},
  [0xF987] = {0x9A6A, 0xFE00},
  [0xF988] = {0x9E97, 0xFE00},
  [0xF989] = {0x9ECE, 0xFE00},
  [0xF98A] = {0x529B, 0xFE00},
  [0xF98B] = {0x66C6, 0xFE00},
  [0xF98C] = {0x6B77, 0xFE00},
  [0xF98D] = {0x8F62, 0xFE00},
  [0xF98E] = {0x5E74, 0xFE00},
  [0xF98F] = {0x6190, 0xFE00},
  [0xF990] = {0x6200, 0xFE00},
  [0xF991] = {0x649A, 0xFE00},
  [0xF992] = {0x6F23, 0xFE00},
  [0xF993] = {0x7149, 0xFE00},
  [0xF994] = {0x7489, 0xFE00},
  [0xF995] = {0x79CA, 0xFE00},
  [0xF996] = {0x7DF4, 0xFE00},
  [0xF997] = {0x806F, 0xFE00},
  [0xF998] = {0x8F26, 0xFE00},
  [0xF999] = {0x84EE, 0xFE00},
  [0xF99A] = {0x9023, 0xFE00},
  [0xF99B] = {0x934A, 0xFE00},
  [0xF99C] = {0x5217, 0xFE00},
  [0xF99D] = {0x52A3, 0xFE00},
  [0xF99E] = {0x54BD, 0xFE00},
  [0xF99F] = {0x70C8, 0xFE00},
  [0xF9A0] = {0x88C2, 0xFE00},
  [0xF9A1] = {0x8AAA, 0xFE01},
  [0xF9A2] = {0x5EC9, 0xFE00},
  [0xF9A3] = {0x5FF5, 0xFE00},
  [0xF9A4] = {0x637B, 0xFE00},
  [0xF9A5] = {0x6BAE, 0xFE00},
  [0xF9A6] = {0x7C3E, 0xFE00},
  [0xF9A7] = {0x7375, 0xFE00},
  [0xF9A8] = {0x4EE4, 0xFE00},
  [0xF9A9] = {0x56F9, 0xFE00},
  [0xF9AA] = {0x5BE7, 0xFE01},
  [0xF9AB] = {0x5DBA, 0xFE00},
  [0xF9AC] = {0x601C, 0xFE00},
  [0xF9AD] = {0x73B2, 0xFE00},
  [0xF9AE] = {0x7469, 0xFE00},
  [0xF9AF] = {0x7F9A, 0xFE00},
  [0xF9B0] = {0x8046, 0xFE00},
  [0xF9B1] = {0x9234, 0xFE00},
  [0xF9B2] = {0x96F6, 0xFE00},
  [0xF9B3] = {0x9748, 0xFE00},
  [0xF9B4] = {0x9818, 0xFE00},
  [0xF9B5] = {0x4F8B, 0xFE00},
  [0xF9B6] = {0x79AE, 0xFE00},
  [0xF9B7] = {0x91B4, 0xFE00},
  [0xF9B8] = {0x96B8, 0xFE00},
  [0xF9B9] = {0x60E1, 0xFE00},
  [0xF9BA] = {0x4E86, 0xFE00},
  [0xF9BB] = {0x50DA, 0xFE00},
  [0xF9BC] = {0x5BEE, 0xFE00},
  [0xF9BD] = {0x5C3F, 0xFE00},
  [0xF9BE] = {0x6599, 0xFE00},
  [0xF9BF] = {0x6A02, 0xFE02},
  [0xF9C0] = {0x71CE, 0xFE00},
  [0xF9C1] = {0x7642, 0xFE00},
  [0xF9C2] = {0x84FC, 0xFE00},
  [0xF9C3] = {0x907C, 0xFE00},
  [0xF9C4] = {0x9F8D, 0xFE00},
  [0xF9C5] = {0x6688, 0xFE00},
  [0xF9C6] = {0x962E, 0xFE00},
  [0xF9C7] = {0x5289, 0xFE00},
  [0xF9C8] = {0x677B, 0xFE00},
  [0xF9C9] = {0x67F3, 0xFE00},
  [0xF9CA] = {0x6D41, 0xFE00},
  [0xF9CB] = {0x6E9C, 0xFE00},
  [0xF9CC] = {0x7409, 0xFE00},
  [0xF9CD] = {0x7559, 0xFE00},
  [0xF9CE] = {0x786B, 0xFE00},
  [0xF9CF] = {0x7D10, 0xFE00},
  [0xF9D0] = {0x985E, 0xFE00},
  [0xF9D1] = {0x516D, 0xFE00},
  [0xF9D2] = {0x622E, 0xFE00},
  [0xF9D3] = {0x9678, 0xFE00},
  [0xF9D4] = {0x502B, 0xFE00},
  [0xF9D5] = {0x5D19, 0xFE00},
  [0xF9D6] = {0x6DEA, 0xFE00},
  [0xF9D7] = {0x8F2A, 0xFE00},
  [0xF9D8] = {0x5F8B, 0xFE00},
  [0xF9D9] = {0x6144, 0xFE00},
  [0xF9DA] = {0x6817, 0xFE00},
  [0xF9DB] = {0x7387, 0xFE01},
  [0xF9DC] = {0x9686, 0xFE00},
  [0xF9DD] = {0x5229, 0xFE00},
  [0xF9DE] = {0x540F, 0xFE00},
  [0xF9DF] = {0x5C65, 0xFE00},
  [0xF9E0] = {0x6613, 0xFE00},
  [0xF9E1] = {0x674E, 0xFE00},
  [0xF9E2] = {0x68A8, 0xFE00},
  [0xF9E3] = {0x6CE5, 0xFE00},
  [0xF9E4] = {0x7406, 0xFE00},
  [0xF9E5] = {0x75E2, 0xFE00},
  [0xF9E6] = {0x7F79, 0xFE00},
  [0xF9E7] = {0x88CF, 0xFE00},
  [0xF9E8] = {0x88E1, 0xFE00},
  [0xF9E9] = {0x91CC, 0xFE00},
  [0xF9EA] = {0x96E2, 0xFE00},
  [0xF9EB] = {0x533F, 0xFE00},
  [0xF9EC] = {0x6EBA, 0xFE00},
  [0xF9ED] = {0x541D, 0xFE00},
  [0xF9EE] = {0x71D0, 0xFE00},
  [0xF9EF] = {0x7498, 0xFE00},
  [0xF9F0] = {0x85FA, 0xFE00},
  [0xF9F1] = {0x96A3, 0xFE00},
  [0xF9F2] = {0x9C57, 0xFE00},
  [0xF9F3] = {0x9E9F, 0xFE00},
  [0xF9F4] = {0x6797, 0xFE00},
  [0xF9F5] = {0x6DCB, 0xFE00},
  [0xF9F6] = {0x81E8, 0xFE00},
  [0xF9F7] = {0x7ACB, 0xFE00},
  [0xF9F8] = {0x7B20, 0xFE00},
  [0xF9F9] = {0x7C92, 0xFE00},
  [0xF9FA] = {0x72C0, 0xFE00},
  [0xF9FB] = {0x7099, 0xFE00},
  [0xF9FC] = {0x8B58, 0xFE00},
  [0xF9FD] = {0x4EC0, 0xFE00},
  [0xF9FE] = {0x8336, 0xFE00},
  [0xF9FF] = {0x523A, 0xFE00},
  [0xFA00] = {0x5207, 0xFE00},
  [0xFA01] = {0x5EA6, 0xFE00},
  [0xFA02] = {0x62D3, 0xFE00},
  [0xFA03] = {0x7CD6, 0xFE00},
  [0xFA04] = {0x5B85, 0xFE00},
  [0xFA05] = {0x6D1E, 0xFE00},
  [0xFA06] = {0x66B4, 0xFE00},
  [0xFA07] = {0x8F3B, 0xFE00},
  [0xFA08] = {0x884C, 0xFE00},
  [0xFA09] = {0x964D, 0xFE00},
  [0xFA0A] = {0x898B, 0xFE00},
  [0xFA0B] = {0x5ED3, 0xFE00},
  [0xFA2E] = {0x90DE, 0xFE00},
  [0xFA2F] = {0x96B7, 0xFE00},
}
local jamotocjamo = {
  ccho = {
    [0x1100] = 0x3131,
    [0x1101] = 0x3132,
    -- [0x11AA] = 0x3133,
    [0x1102] = 0x3134,
    -- [0x11AC] = 0x3135,
    -- [0x11AD] = 0x3136,
    [0x1103] = 0x3137,
    [0x1104] = 0x3138,
    [0x1105] = 0x3139,
    -- [0x11B0] = 0x313A,
    -- [0x11B1] = 0x313B,
    -- [0x11B2] = 0x313C,
    -- [0x11B3] = 0x313D,
    -- [0x11B4] = 0x313E,
    -- [0x11B5] = 0x313F,
    [0x111A] = 0x3140,
    [0x1106] = 0x3141,
    [0x1107] = 0x3142,
    [0x1108] = 0x3143,
    [0x1121] = 0x3144,
    [0x1109] = 0x3145,
    [0x110A] = 0x3146,
    [0x110B] = 0x3147,
    [0x110C] = 0x3148,
    [0x110D] = 0x3149,
    [0x110E] = 0x314A,
    [0x110F] = 0x314B,
    [0x1110] = 0x314C,
    [0x1111] = 0x314D,
    [0x1112] = 0x314E,
    [0x1114] = 0x3165,
    [0x1115] = 0x3166,
    -- [0x11C7] = 0x3167,
    -- [0x11C8] = 0x3168,
    -- [0x11CC] = 0x3169,
    -- [0x11CE] = 0x316A,
    -- [0x11D3] = 0x316B,
    -- [0x11D7] = 0x316C,
    -- [0x11D9] = 0x316D,
    [0x111C] = 0x316E,
    -- [0x11DD] = 0x316F,
    -- [0x11DF] = 0x3170,
    [0x111D] = 0x3171,
    [0x111E] = 0x3172,
    [0x1120] = 0x3173,
    [0x1122] = 0x3174,
    [0x1123] = 0x3175,
    [0x1127] = 0x3176,
    [0x1129] = 0x3177,
    [0x112B] = 0x3178,
    [0x112C] = 0x3179,
    [0x112D] = 0x317A,
    [0x112E] = 0x317B,
    [0x112F] = 0x317C,
    [0x1132] = 0x317D,
    [0x1136] = 0x317E,
    [0x1140] = 0x317F,
    [0x1147] = 0x3180,
    [0x114C] = 0x3181,
    -- [0x11F1] = 0x3182,
    -- [0x11F2] = 0x3183,
    [0x1157] = 0x3184,
    [0x1158] = 0x3185,
    [0x1159] = 0x3186,
  },
  cjung = {
    [0x1161] = 0x314F,
    [0x1162] = 0x3150,
    [0x1163] = 0x3151,
    [0x1164] = 0x3152,
    [0x1165] = 0x3153,
    [0x1166] = 0x3154,
    [0x1167] = 0x3155,
    [0x1168] = 0x3156,
    [0x1169] = 0x3157,
    [0x116A] = 0x3158,
    [0x116B] = 0x3159,
    [0x116C] = 0x315A,
    [0x116D] = 0x315B,
    [0x116E] = 0x315C,
    [0x116F] = 0x315D,
    [0x1170] = 0x315E,
    [0x1171] = 0x315F,
    [0x1172] = 0x3160,
    [0x1173] = 0x3161,
    [0x1174] = 0x3162,
    [0x1175] = 0x3163,
    -- [0x1160] = 0x3164,
    [0x1184] = 0x3187,
    [0x1185] = 0x3188,
    [0x1188] = 0x3189,
    [0x1191] = 0x318A,
    [0x1192] = 0x318B,
    [0x1194] = 0x318C,
    [0x119E] = 0x318D,
    [0x11A1] = 0x318E,
  }
}

local function is_hangul (c)
  return c >= 0xAC00 and c <= 0xD7A3
end

local function is_modern_cho (c)
  return c >= 0x1100 and c <= 0x1112
end

local function is_modern_jung (c)
  return c >= 0x1161 and c <= 0x1175
end

local function is_modern_jong (c)
  return c >= 0x11A8 and c <= 0x11C2
end

local function is_old_jong (c)
  return c >= 0x11C3 and c <= 0x11FF
  or     c >= 0xD7CB and c <= 0xD7FB
end

local function is_jongsong (c)
  return is_modern_jong(c) or is_old_jong(c)
end

local function jamo2syllable (t) -- table -> integer
  local cho, jung, jong = tableunpack(t)
  local s = (cho - 0x1100) * 21
  s = (s + jung - 0x1161) * 28
  if jong then
    s = s + jong - 0x11A7
  end
  return s + 0xAC00
end

local function syllable2jamo (s) -- integer -> table
    local t = {}
    s = s - 0xAC00
    t[1] = s // 588 + 0x1100
    t[2] = s % 588 // 28 + 0x1161
    local jong = s % 28
    if jong ~= 0 then
      t[3] = jong + 0x11A7
    end
    return t
end

local function hanguldecompose (buffer)
  local t = {}
  for _, c in utf8codes(buffer) do
    if is_hangul(c) then
      tableappend(t, syllable2jamo(c))
    else
      tableinsert(t, c)
    end
  end
  return utf8char(tableunpack(t))
end

-- LV | LVT, T  -> L, V, T+
local function flush_syllable_jong (t, s)
  if #s == 2 then
    tableappend(t, syllable2jamo( s[1] ))
    tableinsert(t, s[2])
  else
    tableappend(t, s)
  end
  return t, {}
end

local function compose_hanguldecompose (buffer) -- string -> table
  local t, s = {}, {}
  for _, c in utf8codes(buffer) do
    if #s == 1 and is_jongsong(c) then
      tableinsert(s, c)
    else
      t, s = flush_syllable_jong(t, s)
      tableinsert(is_hangul(c) and s or t, c)
    end
  end
  t = flush_syllable_jong(t, s)
  return t
end

-- L, V, [T & ^OT]? -> LV | LVT
local function flush_syllable (t, s)
  if #s == 2 or #s == 3 and is_modern_jong( s[3] ) then
    tableinsert(t, jamo2syllable(s))
  else
    tableappend(t, s)
  end
  return t, {}
end

local function compose_modern_hangul (ot)
  local t, s = {}, {}
  for _, c in ipairs(ot) do
    if #s == 1 and is_modern_jung(c) or #s >= 2 and is_jongsong(c) then
      tableinsert(s, c)
    else
      t, s = flush_syllable(t, s)
      tableinsert(is_modern_cho(c) and s or t, c)
    end
  end
  t = flush_syllable(t, s)
  return t
end

-- L, VF -> CL
local function flush_cjamocho (t, s)
  if #s == 2 then
    tableinsert(t, jamotocjamo.ccho[ s[1] ])
  else
    tableappend(t, s)
  end
  return t, {}
end

local function compose_jamo_chosong (ot)
  local t, s = {}, {}
  for _, c in ipairs(ot) do
    if #s == 1 and c == 0x1160 then
      tableinsert(s, c)
    else
      t, s = flush_cjamocho(t, s)
      tableinsert(jamotocjamo.ccho[c] and s or t, c)
    end
  end
  t = flush_cjamocho(t, s)
  return t
end

-- LF, V, ^T -> CV, ^T
local function flush_cjamojung (t, s)
  if #s == 2 then
    tableinsert(t, jamotocjamo.cjung[ s[2] ])
  else
    tableappend(t, s)
  end
  return t, {}
end

local function compose_jamo_jungsong (ot)
  local t, s = {}, {}
  for _, c in ipairs(ot) do
    if #s == 1 and jamotocjamo.cjung[c] or #s == 2 and is_jongsong(c) then
      tableinsert(s, c)
    else
      t, s = flush_cjamojung(t, s)
      tableinsert(c == 0x115F and s or t, c)
    end
  end
  t = flush_cjamojung(t, s)
  return t
end

-- CHJ -> HJ, VS
local function flush_compat_hanja (t, s)
  if #s == 1 then
    tableappend(t, chanjatohanja[ s[1] ])
  else
    tableappend(t, s)
  end
  return t, {}
end

local function compose_compat_hanja (ot)
  local t, s = {}, {}
  for _, c in ipairs(ot) do
    if #s ==  1 and c >= 0xFE00 and c <= 0xFE02 then
      tableinsert(s, c)
    else
      t, s = flush_compat_hanja(t, s)
      tableinsert(chanjatohanja[c] and s or t, c)
    end
  end
  t = flush_compat_hanja(t, s)
  return t
end

local function hangulcompose (buffer)
  local t = compose_hanguldecompose(buffer)
  t = compose_modern_hangul(t)
  t = compose_jamo_chosong (t)
  t = compose_jamo_jungsong(t)
  t = compose_compat_hanja (t)

  return utf8char(tableunpack(t))
end

local loaded = false
local add_to_callback = luatexbase.add_to_callback
local remove_from_callback = luatexbase.remove_from_callback

local function unload()
  if loaded then
    remove_from_callback('process_input_buffer', 'luatexko.hangul_normalize')
    loaded = false
  end
end
luatexkonormalize.unload = unload

local function compose()
  unload()
  add_to_callback('process_input_buffer', hangulcompose, 'luatexko.hangul_normalize')
  loaded = true
end
luatexkonormalize.compose = compose

local function decompose()
  unload()
  add_to_callback('process_input_buffer', hanguldecompose, 'luatexko.hangul_normalize')
  loaded = true
end
luatexkonormalize.decompose = decompose