summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/latex/polyglossia/polyglossia-korean.lua
blob: 056c8e41d8fc81cdb97c132509d57d98723351e2 (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
--
-- polyglossia-korean.lua
--

local glyph_id = node.id"glyph"
local hbox_id  = node.id"hlist"
local vbox_id  = node.id"vlist"
local glue_id  = node.id"glue"
local penalty_id = node.id"penalty"
local disc_id  = node.id"disc"

--
-- attr_korean: variant = plain (0), classic (1), modern (2)
--
local attr_korean = luatexbase.attributes["xpg@attr@korean"]
local attr_josa   = luatexbase.attributes["xpg@attr@autojosa"]

--
-- characters after which linebreak is not allowed
--
local nobr_after = {
    [0x28] = 1, -- ( LEFT PARENTHESIS
    [0x3C] = 1, -- < LESS-THAN SIGN
    [0x5B] = 1, -- [ LEFT SQUARE BRACKET
    [0x60] = 1, -- ` GRAVE ACCENT
    [0x7B] = 1, -- { LEFT CURLY BRACKET
    [0xAB] = 1, -- « LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
    [0x2018] = 1, -- ‘ LEFT SINGLE QUOTATION MARK
    [0x201C] = 1, -- “ LEFT DOUBLE QUOTATION MARK
    [0x2329] = 1, -- 〈 LEFT-POINTING ANGLE BRACKET
    [0x3008] = 1, -- 〈 LEFT ANGLE BRACKET
    [0x300A] = 1, -- 《 LEFT DOUBLE ANGLE BRACKET
    [0x300C] = 1, -- 「 LEFT CORNER BRACKET
    [0x300E] = 1, -- 『 LEFT WHITE CORNER BRACKET
    [0x3010] = 1, -- 【 LEFT BLACK LENTICULAR BRACKET
    [0x3014] = 1, -- 〔 LEFT TORTOISE SHELL BRACKET
    [0x3016] = 1, -- 〖 LEFT WHITE LENTICULAR BRACKET
    [0x3018] = 1, -- 〘 LEFT WHITE TORTOISE SHELL BRACKET
    [0x301A] = 1, -- 〚 LEFT WHITE SQUARE BRACKET
    [0x301D] = 1, -- 〝 REVERSED DOUBLE PRIME QUOTATION MARK
    [0xFE17] = 1, -- ︗ PRESENTATION FORM FOR VERTICAL LEFT WHITE LENTICULAR BRACKET
    [0xFE35] = 1, -- ︵ PRESENTATION FORM FOR VERTICAL LEFT PARENTHESIS
    [0xFE37] = 1, -- ︷ PRESENTATION FORM FOR VERTICAL LEFT CURLY BRACKET
    [0xFE39] = 1, -- ︹ PRESENTATION FORM FOR VERTICAL LEFT TORTOISE SHELL BRACKET
    [0xFE3B] = 1, -- ︻ PRESENTATION FORM FOR VERTICAL LEFT BLACK LENTICULAR BRACKET
    [0xFE3D] = 1, -- ︽ PRESENTATION FORM FOR VERTICAL LEFT DOUBLE ANGLE BRACKET
    [0xFE3F] = 1, -- ︿ PRESENTATION FORM FOR VERTICAL LEFT ANGLE BRACKET
    [0xFE41] = 1, -- ﹁ PRESENTATION FORM FOR VERTICAL LEFT CORNER BRACKET
    [0xFE43] = 1, -- ﹃ PRESENTATION FORM FOR VERTICAL LEFT WHITE CORNER BRACKET
    [0xFE47] = 1, -- ﹇ PRESENTATION FORM FOR VERTICAL LEFT SQUARE BRACKET
    [0xFE59] = 1, -- ﹙ SMALL LEFT PARENTHESIS
    [0xFE5B] = 1, -- ﹛ SMALL LEFT CURLY BRACKET
    [0xFE5D] = 1, -- ﹝ SMALL LEFT TORTOISE SHELL BRACKET
    [0xFF08] = 1, -- ( FULLWIDTH LEFT PARENTHESIS
    [0xFF3B] = 1, -- [ FULLWIDTH LEFT SQUARE BRACKET
    [0xFF5B] = 1, -- { FULLWIDTH LEFT CURLY BRACKET
    [0xFF5F] = 1, -- ⦅ FULLWIDTH LEFT WHITE PARENTHESIS
    [0xFF62] = 1, -- 「 HALFWIDTH LEFT CORNER BRACKET
}

--
-- characters before which linebreak is not allowed
--   (currently, not much differences among the followings)
--   1: normal chars
--   2: hangul jamo vowels and trailing consonants
--   3: kana small letters
--   0: dashes (supress visible spacing)
--
local nobr_before = setmetatable({
    [0x21] = 1, -- ! EXCLAMATION MARK
    [0x22] = 1, -- " QUOTATION MARK
    [0x27] = 1, -- ' APOSTROPHE
    [0x29] = 1, -- ) RIGHT PARENTHESIS
    [0x2C] = 1, -- , COMMA
    [0x2D] = 0, -- - HYPHEN-MINUS
    [0x2E] = 1, -- . FULL STOP
    [0x2F] = 0, -- / SOLIDUS
    [0x3A] = 0, -- : COLON
    [0x3B] = 1, -- ; SEMICOLON
    [0x3E] = 1, -- > GREATER-THAN SIGN
    [0x3F] = 1, -- ? QUESTION MARK
    [0x5C] = 0, -- \ REVERSE SOLIDUS
    [0x5D] = 1, -- ] RIGHT SQUARE BRACKET
    [0x7D] = 1, -- } RIGHT CURLY BRACKET
    [0x7E] = 0, -- ~ TILDE
    [0xB7] = 1, -- · MIDDLE DOT
    [0xBB] = 1, -- » RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
    [0x2013] = 0, -- – EN DASH
    [0x2014] = 0, -- — EM DASH
    [0x2015] = 1, -- ― HORIZONTAL BAR
    [0x2019] = 1, -- ’ RIGHT SINGLE QUOTATION MARK
    [0x201D] = 1, -- ” RIGHT DOUBLE QUOTATION MARK
    [0x2025] = 1, -- ‥ TWO DOT LEADER
    [0x2026] = 1, -- … HORIZONTAL ELLIPSIS
    [0x232A] = 1, -- 〉 RIGHT-POINTING ANGLE BRACKET
    [0x3001] = 1, -- 、 IDEOGRAPHIC COMMA
    [0x3002] = 1, -- 。 IDEOGRAPHIC FULL STOP
    [0x3005] = 1, -- 々 IDEOGRAPHIC ITERATION MARK
    [0x3009] = 1, -- 〉 RIGHT ANGLE BRACKET
    [0x300B] = 1, -- 》 RIGHT DOUBLE ANGLE BRACKET
    [0x300D] = 1, -- 」 RIGHT CORNER BRACKET
    [0x300F] = 1, -- 』 RIGHT WHITE CORNER BRACKET
    [0x3011] = 1, -- 】 RIGHT BLACK LENTICULAR BRACKET
    [0x3015] = 1, -- 〕 RIGHT TORTOISE SHELL BRACKET
    [0x3017] = 1, -- 〗 RIGHT WHITE LENTICULAR BRACKET
    [0x3019] = 1, -- 〙 RIGHT WHITE TORTOISE SHELL BRACKET
    [0x301B] = 1, -- 〛 RIGHT WHITE SQUARE BRACKET
    [0x301C] = 1, -- 〜 WAVE DASH
    [0x301E] = 1, -- 〞 DOUBLE PRIME QUOTATION MARK
    [0x301F] = 1, -- 〟 LOW DOUBLE PRIME QUOTATION MARK
    [0x3035] = 1, -- 〵 VERTICAL KANA REPEAT MARK LOWER HALF
    [0x303B] = 1, -- 〻 VERTICAL IDEOGRAPHIC ITERATION MARK
    [0x303C] = 1, -- 〼 MASU MARK
    [0x3041] = 3, -- ぁ HIRAGANA LETTER SMALL A
    [0x3043] = 3, -- ぃ HIRAGANA LETTER SMALL I
    [0x3045] = 3, -- ぅ HIRAGANA LETTER SMALL U
    [0x3047] = 3, -- ぇ HIRAGANA LETTER SMALL E
    [0x3049] = 3, -- ぉ HIRAGANA LETTER SMALL O
    [0x3063] = 3, -- っ HIRAGANA LETTER SMALL TU
    [0x3083] = 3, -- ゃ HIRAGANA LETTER SMALL YA
    [0x3085] = 3, -- ゅ HIRAGANA LETTER SMALL YU
    [0x3087] = 3, -- ょ HIRAGANA LETTER SMALL YO
    [0x308E] = 3, -- ゎ HIRAGANA LETTER SMALL WA
    [0x3095] = 3, -- ゕ HIRAGANA LETTER SMALL KA
    [0x3096] = 3, -- ゖ HIRAGANA LETTER SMALL KE
    [0x3099] = 1, --  COMBINING KATAKANA-HIRAGANA VOICED SOUND MARK
    [0x309A] = 1, --  COMBINING KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK
    [0x309B] = 1, -- ゛ KATAKANA-HIRAGANA VOICED SOUND MARK
    [0x309C] = 1, -- ゜ KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK
    [0x309D] = 1, -- ゝ HIRAGANA ITERATION MARK
    [0x309E] = 1, -- ゞ HIRAGANA VOICED ITERATION MARK
    [0x30A0] = 1, -- ゠ KATAKANA-HIRAGANA DOUBLE HYPHEN
    [0x30A1] = 3, -- ァ KATAKANA LETTER SMALL A
    [0x30A3] = 3, -- ィ KATAKANA LETTER SMALL I
    [0x30A5] = 3, -- ゥ KATAKANA LETTER SMALL U
    [0x30A7] = 3, -- ェ KATAKANA LETTER SMALL E
    [0x30A9] = 3, -- ォ KATAKANA LETTER SMALL O
    [0x30C3] = 3, -- ッ KATAKANA LETTER SMALL TU
    [0x30E3] = 3, -- ャ KATAKANA LETTER SMALL YA
    [0x30E5] = 3, -- ュ KATAKANA LETTER SMALL YU
    [0x30E7] = 3, -- ョ KATAKANA LETTER SMALL YO
    [0x30EE] = 3, -- ヮ KATAKANA LETTER SMALL WA
    [0x30F5] = 3, -- ヵ KATAKANA LETTER SMALL KA
    [0x30F6] = 3, -- ヶ KATAKANA LETTER SMALL KE
    [0x30FB] = 1, -- ・ KATAKANA MIDDLE DOT
    [0x30FC] = 1, -- ー KATAKANA-HIRAGANA PROLONGED SOUND MARK
    [0x30FD] = 1, -- ヽ KATAKANA ITERATION MARK
    [0x30FE] = 1, -- ヾ KATAKANA VOICED ITERATION MARK
    [0xFE30] = 1, -- ︰ PRESENTATION FORM FOR VERTICAL TWO DOT LEADER
    [0xFE31] = 1, -- ︱ PRESENTATION FORM FOR VERTICAL EM DASH
    [0xFE32] = 1, -- ︲ PRESENTATION FORM FOR VERTICAL EN DASH
    [0xFE36] = 1, -- ︶ PRESENTATION FORM FOR VERTICAL RIGHT PARENTHESIS
    [0xFE38] = 1, -- ︸ PRESENTATION FORM FOR VERTICAL RIGHT CURLY BRACKET
    [0xFE3A] = 1, -- ︺ PRESENTATION FORM FOR VERTICAL RIGHT TORTOISE SHELL BRACKET
    [0xFE3C] = 1, -- ︼ PRESENTATION FORM FOR VERTICAL RIGHT BLACK LENTICULAR BRACKET
    [0xFE3E] = 1, -- ︾ PRESENTATION FORM FOR VERTICAL RIGHT DOUBLE ANGLE BRACKET
    [0xFE40] = 1, -- ﹀ PRESENTATION FORM FOR VERTICAL RIGHT ANGLE BRACKET
    [0xFE42] = 1, -- ﹂ PRESENTATION FORM FOR VERTICAL RIGHT CORNER BRACKET
    [0xFE44] = 1, -- ﹄ PRESENTATION FORM FOR VERTICAL RIGHT WHITE CORNER BRACKET
    [0xFE48] = 1, -- ﹈ PRESENTATION FORM FOR VERTICAL RIGHT SQUARE BRACKET
    [0xFE5A] = 1, -- ﹚ SMALL RIGHT PARENTHESIS
    [0xFE5C] = 1, -- ﹜ SMALL RIGHT CURLY BRACKET
    [0xFE5E] = 1, -- ﹞ SMALL RIGHT TORTOISE SHELL BRACKET
    [0xFF01] = 1, -- ! FULLWIDTH EXCLAMATION MARK
    [0xFF09] = 1, -- ) FULLWIDTH RIGHT PARENTHESIS
    [0xFF0C] = 1, -- , FULLWIDTH COMMA
    [0xFF0E] = 1, -- . FULLWIDTH FULL STOP
    [0xFF1A] = 1, -- : FULLWIDTH COLON
    [0xFF1B] = 1, -- ; FULLWIDTH SEMICOLON
    [0xFF1F] = 1, -- ? FULLWIDTH QUESTION MARK
    [0xFF3D] = 1, -- ] FULLWIDTH RIGHT SQUARE BRACKET
    [0xFF5D] = 1, -- } FULLWIDTH RIGHT CURLY BRACKET
    [0xFF60] = 1, -- ⦆ FULLWIDTH RIGHT WHITE PARENTHESIS
    [0xFF61] = 1, -- 。 HALFWIDTH IDEOGRAPHIC FULL STOP
    [0xFF63] = 1, -- 」 HALFWIDTH RIGHT CORNER BRACKET
    [0xFF64] = 1, -- 、 HALFWIDTH IDEOGRAPHIC COMMA
    [0xFF65] = 1, -- ・ HALFWIDTH KATAKANA MIDDLE DOT
    [0xFF9E] = 1, -- ゙ HALFWIDTH KATAKANA VOICED SOUND MARK
    [0xFF9F] = 1, -- ゚ HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK
}, { __index = function(_,c)
        if c >= 0x1160  and c <= 0x11FF  then return 2 end
        if c >= 0xD7B0  and c <= 0xD7FF  then return 2 end
        if c >= 0x302A  and c <= 0x302F  then return 1 end
        if c >= 0x31F0  and c <= 0x31FF  then return 3 end
        if c >= 0xFF67  and c <= 0xFF70  then return 3 end
        if c >= 0xFE00  and c <= 0xFE0F  then return 1 end
        if c >= 0xFE10  and c <= 0xFE19 and not (c == 0xFE17) then return 1 end
        if c >= 0xFE50  and c <= 0xFE58  then return 1 end
        if c >= 0xE0100 and c <= 0xE01EF then return 1 end
    end
})

--
-- whether 'c' is a cjk character
--
local function is_cjk (c)
    return c >= 0xAC00  and c <= 0xD7FF
    or     c >= 0x1100  and c <= 0x11FF
    or     c >= 0xA960  and c <= 0xA97F
    or     c >= 0x2E80  and c <= 0x9FFF
    or     c >= 0xF900  and c <= 0xFAFF
    or     c >= 0xFE10  and c <= 0xFE1F
    or     c >= 0xFE30  and c <= 0xFE6F
    or     c >= 0xFF00  and c <= 0xFFEF
    or     c >= 0x1F100 and c <= 0x1F2FF
    or     c >= 0x20000 and c <= 0x2FA1F
    or     nobr_after[c]  and c > 0x2014
    or     nobr_before[c] and c > 0x2014
end

--
-- classify cjk characters
--   1: openings
--   2: closings
--   3: centered chars
--   4: full stops
--   5: ellipses
--   6: exclamation and question marks
--   0: all others
--
local charclass = setmetatable({
    [0x2018] = 1, [0x201C] = 1, [0x2329] = 1, [0x3008] = 1,
    [0x300A] = 1, [0x300C] = 1, [0x300E] = 1, [0x3010] = 1,
    [0x3014] = 1, [0x3016] = 1, [0x3018] = 1, [0x301A] = 1,
    [0x301D] = 1, [0xFE17] = 1, [0xFE35] = 1, [0xFE37] = 1,
    [0xFE39] = 1, [0xFE3B] = 1, [0xFE3D] = 1, [0xFE3F] = 1,
    [0xFE41] = 1, [0xFE43] = 1, [0xFE47] = 1, [0xFF08] = 1,
    [0xFF3B] = 1, [0xFF5B] = 1, [0xFF5F] = 1, [0xFF62] = 1,
    [0x2019] = 2, [0x201D] = 2, [0x232A] = 2, [0x3001] = 2,
    [0x3009] = 2, [0x300B] = 2, [0x300D] = 2, [0x300F] = 2,
    [0x3011] = 2, [0x3015] = 2, [0x3017] = 2, [0x3019] = 2,
    [0x301B] = 2, [0x301E] = 2, [0x301F] = 2, [0xFE10] = 2,
    [0xFE11] = 2, [0xFE18] = 2, [0xFE36] = 2, [0xFE38] = 2,
    [0xFE3A] = 2, [0xFE3C] = 2, [0xFE3E] = 2, [0xFE40] = 2,
    [0xFE42] = 2, [0xFE44] = 2, [0xFE48] = 2, [0xFF09] = 2,
    [0xFF0C] = 2, [0xFF3D] = 2, [0xFF5D] = 2, [0xFF60] = 2,
    [0xFF63] = 2, [0xFF64] = 2, [0x00B7] = 3, [0x30FB] = 3,
    [0xFF1A] = 3, [0xFF1B] = 3, [0xFF65] = 3, [0x3002] = 4,
    [0xFE12] = 4, [0xFF0E] = 4, [0xFF61] = 4, [0x2015] = 5,
    [0x2025] = 5, [0x2026] = 5, [0xFE19] = 5, [0xFE30] = 5,
    [0xFE31] = 5, [0xFE15] = 6, [0xFE16] = 6, [0xFF01] = 6,
    [0xFF1F] = 6,
}, { __index = function() return 0 end })

--
-- table for spacing between char classes
--   1 stands for 0.5*fontsize when variant=classic
--
local intercharclass = { [0] =
    { [0] = nil,    {1,1},  nil,    {.5,.5} },
    { [0] = nil,    nil,    nil,    {.5,.5} },
    { [0] = {1,1},  {1,1},  nil,    {.5,.5}, nil,    {1,1},  {1,1} },
    { [0] = {.5,.5},{.5,.5},{.5,.5},{1,.5},  {.5,.5},{.5,.5},{.5,.5} },
    { [0] = {1,0},  {1,0},  nil,    {1.5,.5},nil,    {1,0},  {1,0} },
    { [0] = nil,    {1,1},  nil,    {.5,.5} },
    { [0] = {1,1},  {1,1},  nil,    {.5,.5} },
}

--
-- get a new penalty node
--
local function get_new_penalty (p)
    local penalty = node.new("penalty")
    penalty.penalty = p
    return penalty
end

--
-- get a new glue node
--
local function get_new_glue (...)
    local glue = node.new("glue")
    node.setglue(glue, ...)
    return glue
end

--
-- return 0.5*fontsize of given fontid
--   space: true if variant=modern; then 0.5*interword_space
--
local function get_font_size (fid, space)
    local size = font.getparameters(fid)
    if space then
        size = size and size.space or 196608
    else
        size = size and size.quad  or 655360
    end
    return size/2
end

--
-- charclass 1 thru 4 will be packed in \hbox to 0.5em{\hss? curr \hss?}
--   when variant=classic/modern
--
local function glyph_to_box (head, curr, class)
    local g, h = curr
    local size = get_font_size(g.font)
    head, curr = node.remove(head, curr)
    g.next, g.prev = nil, nil
    local hss = get_new_glue(0, 65536, 65536, 2, 2)
    if class == 1 then
        h, hss.next, g.prev = hss, g, hss
    elseif class == 2 or class == 4 then
        h, g.next, hss.prev = g, hss, g
    else
        local hss2 = node.copy(hss)
        h, hss.next, g.prev, g.next, hss2.prev = hss, g, hss, hss2, g
    end
    h = nodes.simple_font_handler(h)
    local box = node.hpack(h, size, "exactly")
    if curr then
        head, curr = node.insert_before(head, curr, box)
    else
        head, curr = node.insert_after(head, node.tail(head), box)
    end
    return head, curr
end

--
-- insert spacing defined as charclass[a][b] between a and b
--   f:    fontid
--   var:  variant = plain, classic, modern
--   cc:   charclass of current char
--   nc:   charclass of next char
--   nobr: linebreak is not allowed
--
local function insert_cjk_penalty_glue (head, curr, f, var, cc, nc, nobr)
    if nobr or cc == 1 or nc > 1 then
        local penalty = get_new_penalty(10000)
        head, curr = node.insert_after(head, curr, penalty)
    end
    local factor = get_font_size(f, var == 2)
    local t = intercharclass[cc][nc]
    local glue = get_new_glue(t[1]*factor, nil, t[2]*factor)
    head, curr = node.insert_after(head, curr, glue)
    return head, curr
end

--
-- insert inter-character spacing in other normal cases
--   f:   fontid
--   var: variant = plain, classic, modern
--   x:   true between cjk and non-cjk (a little more spacing)
--
local function insert_penalty_glue (head, curr, f, var, x)
    if var ~= 1 then
        local penalty = get_new_penalty(50)
        head, curr = node.insert_after(head, curr, penalty)
    end
    local size, glue = get_font_size(f, x and var == 2)
    if x then
        glue = get_new_glue(size/2, size/4, size/8)
    else
        glue = get_new_glue(0, size/10, size/50)
    end
    head, curr = node.insert_after(head, curr, glue)
    return head, curr
end

--
-- main process for linebreak and inter-character spacing
--   lb: true if pre_linebreak_filter
--
local function korean_break (head, lb)
    local curr = head
    while curr do
        if curr.id == glyph_id then
            local var = node.has_attribute(curr, attr_korean)
            if var then
                local c, f = curr.char or 0, curr.font or 0
                local cc, cjkc = charclass[c], is_cjk(c)

                -- compress cjk punctuations when charclass is 1 thru 4
                if var > 0 and cc > 0 and cc < 5 then
                    head, curr = glyph_to_box(head, curr, cc)
                end

                local next = curr.next
                if next and next.id == glyph_id then
                    local n = next.char or 0
                    local nc = charclass[n]
                    local nobr = nobr_before[n] or nobr_after[c]

                    -- insert spacing as of intercharclass
                    if var > 0 and intercharclass[cc][nc] then
                        head, curr = insert_cjk_penalty_glue(head, curr, f, var, cc, nc, nobr)

                    -- or insert spacing when linebreak is allowed
                    elseif not nobr then
                        local cjkn = is_cjk(n)

                        -- if curr or next is cjk char
                        if cjkc or cjkn then

                            -- if between cjk and non-cjk
                            if var > 0 and not (cjkc and cjkn) and nobr_before[c] ~= 0 then
                                head, curr = insert_penalty_glue(head, curr, f, var, true)

                            -- or under pre_linebreak_filter
                            elseif lb then
                                head, curr = insert_penalty_glue(head, curr, f, var)
                            end
                        end
                    end
                end
            end
        end
        curr = curr.next
    end
    return head
end

--
-- process for reordering hangul tone marks (U+302E, U+302F)
--   some hangul fonts (eg. Noto CJK) are so designed that hangul tone marks
--   should be moved to the first position of a syllable.
--   Currently, this functionality is not provided by luaotfload.
--
local function reorder_tm (head)
    local curr, tone = node.slide(head)
    while curr do
        if curr.id == glyph_id and node.has_attribute(curr, attr_korean) then
            local f = font.getfont(curr.font) or font.fonts[curr.font]
            if f and f.hb then -- harfbuzz do the right thing
                tone = nil
            else
                local c, wd = curr.char or 0, curr.width or 0
                if (c == 0x302E or c == 0x302F) and wd > 0 then
                    tone = curr
                elseif tone and not nobr_before[c] then
                    head = node.remove(head, tone)
                    tone.next, tone.prev = nil, nil
                    head, curr = node.insert_before(head, curr, tone)
                    tone = nil
                end
            end
        end
        curr = curr.prev
    end
    return head
end

--
-- automatic josa selection
--
local josa_table = {
    --          consonant ㄹ, vowel,  other consonants
    [0xAC00] = {0xC774,       0xAC00, 0xC774}, -- 가 => 이, 가, 이
    [0xC740] = {0xC740,       0xB294, 0xC740}, -- 은 => 은, 는, 은
    [0xC744] = {0xC744,       0xB97C, 0xC744}, -- 을 => 을, 를, 을
    [0xC640] = {0xACFC,       0xC640, 0xACFC}, -- 와 => 과, 와, 과
    [0xC73C] = {nil,          nil,    0xC73C}, -- 으(로) =>   ,  , 으
    [0xC774] = {0xC774,       nil,    0xC774}, -- 이(라) => 이,  , 이
}

--
-- helper function for number-like characters
--
local function josa_char_num (t, c)
    c = c % 10 + 0x30
    return t[c] or 2
end

--
-- decide josa selection
--
local josa_code = setmetatable({
    [0x30] = 3, [0x31] = 1, [0x33] = 3, [0x36] = 3, [0x37] = 1,
    [0x38] = 1, [0x4C] = 1, [0x4D] = 3, [0x4E] = 3, [0x6C] = 1,
    [0x6D] = 3, [0x6E] = 3, [0xFB02] = 1, [0xFB04] = 1,
},{ __index = function(t,c)
        if c >= 0xAC00 and c <= 0xD7A3 then
            c = (c - 0xAC00) % 28 + 0x11A7
        end
        if c >= 0x11A8 and c <= 0x11FF then
            if c == 0x11AF then return 1 end
            return 3
        end
        if c >= 0xD7CB and c <= 0xD7FB then return 3 end
        if c >= 0x2170 and c <= 0x217F then c = c - 0x10 end
        if c >= 0x2160 and c <= 0x216F then
            if c >= 0x216C then return 3 end
            return josa_char_num(t, c - 0x215F)
        end
        if c >= 0x2460 and c <= 0x2473 then return josa_char_num(t, c - 0x245F) end
        if c >= 0x2474 and c <= 0x2487 then return josa_char_num(t, c - 0x2473) end
        if c >= 0x2488 and c <= 0x249B then return josa_char_num(t, c - 0x2487) end
        if c >= 0x249C and c <= 0x24B5 then return t[c - 0x249C + 0x61] or 2 end
        if c >= 0x24B6 and c <= 0x24CF then return t[c - 0x24B6 + 0x61] or 2 end
        if c >= 0x24D0 and c <= 0x24E9 then return t[c - 0x24D0 + 0x61] or 2 end
        if c >= 0x3131 and c <= 0x318E then
            if c == 0x3139 then return 1 end
            if c >= 0x314F and c <= 0x3163 or c >= 0x3187 then return 2 end
            return 3
        end
        if c >= 0x3260 and c <= 0x327E then c = c - 0x60 end
        if c >= 0x3200 and c <= 0x321E then
            if c == 0x3203 then return 1 end
            if c >= 0x320E then return 2 end
            return 3
        end
        if c >= 0xFF10 and c <= 0xFF19 then return josa_char_num(t, c - 0xFF10) end
        if c >= 0xFF21 and c <= 0xFF3A then return t[c - 0xFF21 + 0x61] or 2 end
        if c >= 0xFF41 and c <= 0xFF5A then return t[c - 0xFF41 + 0x61] or 2 end
        return 2
    end
})

--
-- obtain char that comes just before the josa
--
local function get_prev_char (p)
    while p do
        if p.id == glyph_id then
            local pc = p.char or 0
            if not nobr_after[pc] then
                if not nobr_before[pc] or nobr_before[pc] >= 2 then
                    return pc
                end
            end
        elseif p.id == hbox_id or p.id == vbox_id then
            local pc = get_prev_char(node.slide(p.head))
            if pc then return pc end
        end
        p = p.prev
    end
end

--
-- main process of josa selection
--
local function auto_josa (head)
    local curr, tofree = head, {}
    while curr do
        if curr.id == glyph_id then
            local josa = node.has_attribute(curr, attr_josa)
            if josa then
                local cc = curr.char or 0
                if josa == 0 then
                    josa = josa_code[get_prev_char(curr.prev) or 0x30]
                end
                if cc == 0xC774 then
                    local n = curr.next
                    if n and n.char and n.char >= 0xAC00 and n.char <= 0xD7A3 then
                    else
                        cc = 0xAC00
                    end
                end
                local new = josa_table[cc]
                if new then
                    cc = new[josa]
                    if cc then
                        curr.char = cc
                    else
                        head = node.remove(head, curr)
                        table.insert(tofree, curr)
                    end
                end
                node.unset_attribute(curr, attr_josa)
            end
        end
        curr = curr.next
    end
    for _,v in ipairs(tofree) do node.free(v) end
    return head
end

--
-- now register to luatex callbacks
--   As char value of glyphs can be changed by opentype GSUB process,
--   we have to occupy the first position among callback functions.
--
local prepend_to_callback
if luatexbase.base_add_to_callback then
    prepend_to_callback = function(name, func, desc)
        luatexbase.add_to_callback(name, func, desc, 1)
    end
else
    prepend_to_callback = function(name, func, desc)
        local t = { {func, desc} }
        for _,v in ipairs(luatexbase.callback_descriptions(name)) do
            table.insert(t, {luatexbase.remove_from_callback(name, v)})
        end
        for _,v in ipairs(t) do
            luatexbase.add_to_callback(name, v[1], v[2])
        end
    end
end

prepend_to_callback ("pre_linebreak_filter",
    function(head)
        head = auto_josa(head)
        head = korean_break(head, true)
        head = reorder_tm(head)
        return head
    end,
    "polyglossia.lang_korean")

prepend_to_callback ("hpack_filter",
    function(head)
        head = auto_josa(head)
        head = korean_break(head)
        head = reorder_tm(head)
        return head
    end,
    "polyglossia.lang_korean")

-- vim:ft=lua:tw=0:sw=4:ts=4:expandtab