summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/luatex/luatexja/luatexja.lua
blob: 1b3bd81612bde15b288630f41cb72a62ec513f65 (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

require('lualibs')

------------------------------------------------------------------------
local function load_lua(fn)
   local found = kpse.find_file(fn, 'tex')
   if not found then
      tex.error("LuaTeX-ja error: File `" .. fn .. "' not found")
   else
      texio.write_nl('(' .. found .. ')')
      dofile(found)
   end
end
luatexja.load_lua = load_lua
function luatexja.load_module(name)
   require('ltj-' .. name.. '.lua')
end

do
    local setfield = node.direct.setfield
    luatexja.setglue = node.direct.setglue or
    function(g,w,st,sh,sto,sho)
	setfield(g,'width', w or 0)
	setfield(g,'stretch',st or 0)
	setfield(g,'shrink', sh or 0)
	setfield(g,'stretch_order',sto or 0)
	setfield(g,'shrink_order', sho or 0)
    end
    local getfield = node.direct.getfield
    luatexja.getglue = node.direct.getglue or
    function(g)
	return getfield(g,'width'),
	       getfield(g,'stretch'),
	       getfield(g,'shrink'),
	       getfield(g,'stretch_order'),
	       getfield(g,'shrink_order')
    end
end

--- 以下は全ファイルで共有される定数
local icflag_table = {}
luatexja.icflag_table = icflag_table
icflag_table.ITALIC          = 1
icflag_table.PACKED          = 2
icflag_table.KINSOKU         = 3
icflag_table.FROM_JFM        = 4
-- FROM_JFM: 4, 5, 6, 7, 8 →優先度高(伸びやすく,縮みやすい)
-- 6 が標準
icflag_table.KANJI_SKIP      = 68 -- = 4+64
icflag_table.KANJI_SKIP_JFM  = 69
icflag_table.XKANJI_SKIP     = 70
icflag_table.XKANJI_SKIP_JFM = 71
icflag_table.LINEEND         = 72
icflag_table.PROCESSED       = 73
icflag_table.IC_PROCESSED    = 74
icflag_table.BOXBDD          = 75
icflag_table.PROCESSED_BEGIN_FLAG = 4096 -- sufficiently large power of 2

local stack_table_index = {}
luatexja.stack_table_index = stack_table_index
stack_table_index.PRE  = 0x200000 -- characterごと
stack_table_index.POST = 0x400000 -- characterごと
stack_table_index.KCAT = 0x600000 -- characterごと
stack_table_index.XSP  = 0x800000 -- characterごと
stack_table_index.RIPRE  = 0xA00000 -- characterごと,ruby pre
stack_table_index.RIPOST = 0xC00000 -- characterごと,ruby post
stack_table_index.JWP  = 0 -- これだけ
stack_table_index.KSK  = 1 -- これだけ
stack_table_index.XSK  = 2 -- これだけ
stack_table_index.MJT  = 0x100 -- 0--255
stack_table_index.MJS  = 0x200 -- 0--255
stack_table_index.MJSS = 0x300 -- 0--255
stack_table_index.KSJ  = 0x400 -- 0--9

local userid_table = {}
luatexja.userid_table = userid_table
userid_table.IHB  = luatexbase.newuserwhatsitid('inhibitglue',  'luatexja') -- \inhibitglue
userid_table.STCK = luatexbase.newuserwhatsitid('stack_marker', 'luatexja') -- スタック管理
userid_table.BPAR = luatexbase.newuserwhatsitid('begin_par',    'luatexja') -- 「段落始め」
userid_table.DIR  = luatexbase.newuserwhatsitid('direction',    'luatexja') -- 組方向
userid_table.BOXB = luatexbase.newuserwhatsitid('box_boundary', 'luatexja') -- 「ボックス始め・終わり」
userid_table.JA_AL_BDD = luatexbase.newuserwhatsitid('ja_al_boundary', 'luatexja')

local dir_table = {}
luatexja.dir_table = dir_table
dir_table.dir_dtou = 1
dir_table.dir_tate = 3
dir_table.dir_yoko = 4
dir_table.dir_math_mod    = 8
dir_table.dir_node_auto   = 128 -- 組方向を合わせるために自動で作られたもの
dir_table.dir_node_manual = 256 -- 寸法代入によって作られたもの
dir_table.dir_utod = dir_table.dir_tate + dir_table.dir_math_mod
   -- 「縦数式ディレクション」 in pTeX
--- 定義終わり

local load_module = luatexja.load_module
load_module('base');      local ltjb = luatexja.base
load_module('rmlgbm');    local ltjr = luatexja.rmlgbm -- must be 1st

if luatexja_debug then load_module('debug') end

load_module('lotf_aux');  local ltju = luatexja.lotf_aux
load_module('charrange'); local ltjc = luatexja.charrange
load_module('stack');     local ltjs = luatexja.stack
load_module('direction'); local ltjd = luatexja.direction -- +1 hlist +1 attr_list
load_module('lineskip');  local ltjl = luatexja.lineskip -- +1 hlist +1 attr_list
load_module('jfont');     local ltjf = luatexja.jfont
load_module('inputbuf');  local ltji = luatexja.inputbuf
load_module('pretreat');  local ltjp = luatexja.pretreat
load_module('setwidth');  local ltjw = luatexja.setwidth
load_module('jfmglue');   local ltjj = luatexja.jfmglue -- +1 glue +1 gs +1 attr_list
load_module('math');      local ltjm = luatexja.math
load_module('base');      local ltjb = luatexja.base


local attr_jchar_class = luatexbase.attributes['ltj@charclass']
local attr_jchar_code = luatexbase.attributes['ltj@charcode']
local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
local attr_yablshift = luatexbase.attributes['ltj@yablshift']
local attr_icflag = luatexbase.attributes['ltj@icflag']
local attr_uniqid = luatexbase.attributes['ltj@uniqid']
local attr_dir = luatexbase.attributes['ltj@dir']
local cat_lp = luatexbase.catcodetables['latex-package']

-- Three aux. functions, bollowed from tex.web

local unity=65536
local floor = math.floor

local function print_scaled(s)
   local out=''
   local delta=10
   if s<0 then
      out=out..'-'; s=-s
   end
   out=out..tostring(floor(s/unity)) .. '.'
   s=10*(s%unity)+5
   repeat
      if delta>unity then s=s+32768-50000 end
      out=out .. tostring(floor(s/unity))
      s=10*(s%unity)
      delta=delta*10
   until s<=delta
   return out
end
luatexja.print_scaled = print_scaled

local function print_glue(d,order)
   local out=print_scaled(d)
   if order>0 then
      out=out..'fi'
      while order>1 do
	 out=out..'l'; order=order-1
      end
   else
      out=out..'pt'
   end
   return out
end

local function print_spec(p)
   local out=print_scaled(p.width)..'pt'
   if p.stretch~=0 then
      out=out..' plus '..print_glue(p.stretch,p.stretch_order)
   end
   if p.shrink~=0 then
      out=out..' minus '..print_glue(p.shrink,p.shrink_order)
   end
return out
end


------------------------------------------------------------------------
-- CODE FOR GETTING/SETTING PARAMETERS
------------------------------------------------------------------------

-- EXT: print parameters that don't need arguments
do
   local tex_getattr = tex.getattribute
   local function getattr(a)
      local r = tex.getattribute(a)
      return (r==-0x7FFFFFFF) and 0 or r
   end 
   luatexja.unary_pars = {
      yalbaselineshift = function(t)
	 return print_scaled(getattr('ltj@yablshift'))..'pt'
      end,
      yjabaselineshift = function(t)
	 return print_scaled(getattr('ltj@ykblshift'))..'pt'
      end,
      talbaselineshift = function(t)
	 return print_scaled(getattr('ltj@tablshift'))..'pt'
      end,
      tjabaselineshift = function(t)
	 return print_scaled(getattr('ltj@tkblshift'))..'pt'
      end,
      kanjiskip = function(t)
	 return print_spec(ltjs.get_stack_skip(stack_table_index.KSK, t))
      end,
      xkanjiskip = function(t)
	 return print_spec(ltjs.get_stack_skip(stack_table_index.XSK, t))
      end,
      jcharwidowpenalty = function(t)
	 return ltjs.get_stack_table(stack_table_index.JWP, 0, t)
      end,
      autospacing = function(t)
	 return getattr('ltj@autospc')
      end,
      autoxspacing = function(t)
	 return getattr('ltj@autoxspc')
      end,
      differentjfm = function(t)
	 local f, r = luatexja.jfmglue.diffmet_rule, '???'
	 if f == math.max then r = 'large'
	 elseif f == math.min then r = 'small'
	 elseif f == math.two_average then r = 'average'
	 elseif f == math.two_paverage then r = 'paverage'
	 elseif f == math.two_pleft then r = 'pleft'
	 elseif f == math.two_pright then r = 'pright'
	 elseif f == math.two_add then r = 'both'
	 end
	 return r
      end,
      direction = function()
	 local v = ltjd.get_dir_count()
	 if math.abs(tex.nest[tex.nest.ptr].mode) == ltjs.mmode and v == dir_table.dir_tate then
	    v = dir_table.dir_utod
	 end
	 return v
      end,
      adjustdir = ltjd.get_adjust_dir_count,
   }

   local unary_pars = luatexja.unary_pars
   local scan_arg = token.scan_argument
   function luatexja.ext_get_parameter_unary()
      local k= scan_arg()
      if unary_pars[k] then
	 tex.write(tostring(unary_pars[k](tex.getcount('ltj@@stack'))))
      end
      ltjb.stop_time_measure('get_par')
   end
end


-- EXT: print parameters that need arguments
do
   luatexja.binary_pars = {
      jacharrange = function(c, t)
	 if type(c)~='number' or c<-1 or c>31*ltjc.ATTR_RANGE then
	    -- 0, -1 はエラーにしない(隠し)
	    ltjb.package_error('luatexja',
			       'invalid character range number (' .. tostring(c) .. ')',
			       'A character range number should be in the range 1..'
				  .. 31*ltjc.ATTR_RANGE .. ",\n"..
				  'So I changed this one to ' .. 31*ltjc.ATTR_RANGE .. ".")
	    c=0 -- external range 217 == internal range 0
	 elseif c==31*ltjc.ATTR_RANGE then c=0
	 end
      -- 負の値は <U+0080 の文字の文字範囲,として出てくる.この時はいつも欧文文字なので 1 を返す
	 return (c<0) and 1 or ltjc.get_range_setting(c)
      end,
      prebreakpenalty = function(c, t)
	 return ltjs.get_stack_table(stack_table_index.PRE
					  + ltjb.in_unicode(c, true), 0, t)
      end,
      postbreakpenalty = function(c, t)
	 return ltjs.get_stack_table(stack_table_index.POST
					  + ltjb.in_unicode(c, true), 0, t)
      end,
      kcatcode = function(c, t)
	 return ltjs.get_stack_table(stack_table_index.KCAT
					  + ltjb.in_unicode(c, false), 0, t)
      end,
      chartorange = function(c, t)
	 return ltjc.char_to_range(ltjb.in_unicode(c, false))
      end,
      jaxspmode = function(c, t)
	 return ltjs.get_stack_table(stack_table_index.XSP
					  + ltjb.in_unicode(c, true), 3, t)
      end,
      boxdir = function(c, t)
	 if type(c)~='number' or c<0 or c>65535 then
            ltjb.package_error('luatexja',
                               'Bad register code (' .. tostring(c) .. ')',
                               'A register must be between 0 and 65535.\n'..
                                  'I changed this one to zero.')
            c=0
         end
         return ltjd.get_register_dir(c)
      end,
   }
   local binary_pars = luatexja.binary_pars
   local scan_arg, scan_int = token.scan_argument, token.scan_int
   binary_pars.alxspmode = binary_pars.jaxspmode
   function luatexja.ext_get_parameter_binary(k, c)
      if binary_pars[k] then
	 tex.write(tostring(binary_pars[k](c,tex.getcount('ltj@@stack'))))
      end
      ltjb.stop_time_measure('get_par')
   end
end

-- EXT: print \global if necessary
function luatexja.ext_print_global()
   if luatexja.isglobal=='global' then tex.sprint(cat_lp, '\\global') end
end


-- main process
do
   local start_time_measure, stop_time_measure
      = ltjb.start_time_measure, ltjb.stop_time_measure
   local nullfunc = function (n) return n end
   local to_node = node.direct.tonode
   local to_direct = node.direct.todirect
   local ensure_tex_attr = ltjb.ensure_tex_attr

   -- mode = true iff main_process is called from pre_linebreak_filter
   local function main_process(head, mode, dir, gc)
      ensure_tex_attr(attr_icflag, 0)
      if gc == 'fin_row' then return head
      else
            --luatexja.ext_show_node_list(head, 'T> ', print)
	    start_time_measure('jfmglue')
	    local p = ltjj.main(to_direct(head),mode, dir)
	    stop_time_measure('jfmglue')
	    return to_node(p)
      end
   end

   local function adjust_icflag(h)
      -- kern from luaotfload will have icflag = 1
      -- (same as italic correction)
      ensure_tex_attr(attr_icflag, 1)
      return h
   end

   -- callbacks
   ltjb.add_to_callback(
      'pre_linebreak_filter',
      function (head,groupcode)
	 return main_process(head, true, tex.textdir, groupcode)
      end,'ltj.main',
      luatexbase.priority_in_callback('pre_linebreak_filter', 'luaotfload.node_processor')+1)
   ltjb.add_to_callback(
      'hpack_filter',
      function (head,groupcode,size,packtype, dir)
	 return main_process(head, false, dir, groupcode)
      end,'ltj.main',
      luatexbase.priority_in_callback('hpack_filter', 'luaotfload.node_processor')+1)
   ltjb.add_to_callback('pre_linebreak_filter', adjust_icflag, 'ltj.adjust_icflag', 1)
   ltjb.add_to_callback('hpack_filter', adjust_icflag, 'ltj.adjust_icflag', 1)

end

-- cleanup process
function luatexja.ext_cleanup()
   ltjf.cleanup_size_cache()
   ltjd.remove_end_whatsit()
end


-- lastnodechar
do
   local id_glyph = node.id('glyph')
   function luatexja.pltx_composite_last_node_char()
      local n = tex.nest[tex.nest.ptr].tail
      local r = '-1'
      if n then
	 if n.id==id_glyph then
	    while n.componetns and  n.subtype and n.subtype%4 >= 2 do
	       n = node.tail(n)
	    end
	    r = tostring(n.char)
	 end
      end
      tex.sprint(r)
   end
end

-- debug

do

local node_type = node.type
local node_next = node.next
local has_attr = node.has_attribute

local id_penalty = node.id('penalty')
local id_glyph = node.id('glyph')
local id_glue = node.id('glue')
local id_kern = node.id('kern')
local id_hlist = node.id('hlist')
local id_vlist = node.id('vlist')
local id_rule = node.id('rule')
local id_math = node.id('math')
local id_whatsit = node.id('whatsit')
local sid_user = node.subtype('user_defined')

local function get_attr_icflag(p)
   return (has_attr(p, attr_icflag) or 0) % icflag_table.PROCESSED_BEGIN_FLAG
end

local prefix, inner_depth
local utfchar = utf.char
local function debug_show_node_X(p,print_fn, limit, inner_depth)
   local k = prefix
   local s
   local pt=node_type(p.id)
   local base = prefix .. string.format('%X', get_attr_icflag(p))
   .. ' ' .. pt .. ' ' .. tostring(p.subtype) .. ' '
   if pt == 'glyph' then
      s = base .. ' ' .. 
         (p.char<0xF0000 and utfchar(p.char) or '') 
         .. string.format(' (U+%X) ', p.char)
         .. tostring(p.font) .. ' (' .. print_scaled(p.height) .. '+'
         .. print_scaled(p.depth) .. ')x' .. print_scaled(p.width)
      if p.xoffset~=0 or p.yoffset~=0 then
         s = s .. ' off: (' .. print_scaled(p.xoffset)
               .. ',' .. print_scaled(p.yoffset) .. ')'
      end
      print_fn(s)
   elseif pt=='hlist' or pt=='vlist' or pt=='unset'or pt=='ins' then
      if pt=='ins' then
	 s = base .. '(' .. print_scaled(p.height) .. '+'
	    .. print_scaled(p.depth) .. ')'
	    .. ', dir=' .. tostring(node.has_attribute(p, attr_dir))
      else
	 s = base .. '(' .. print_scaled(p.height) .. '+'
	    .. print_scaled(p.depth) .. ')x' .. print_scaled(p.width)
	    .. ', dir=' .. tostring(node.has_attribute(p, attr_dir))
      end
      if (p.shift or 0)~=0 then
         s = s .. ', shifted ' .. print_scaled(p.shift)
      end
      if p.glue_set and p.glue_sign ==2 or ( p.glue_sign==1 and p.glue_set>0) then
         s = s .. ' glue set '
         if p.glue_sign == 2 then s = s .. '-' end
         s = s .. tostring(floor(p.glue_set*10000)/10000)
         if p.glue_order == 0 then
            s = s .. 'pt'
         else
            s = s .. 'fi'
            for i = 2,  p.glue_order do s = s .. 'l' end
         end
      end
      if get_attr_icflag(p) == icflag_table.PACKED then
         s = s .. ' (packed)'
      end
      print_fn(s);
      local bid = inner_depth
      prefix, inner_depth = prefix.. '.', inner_depth + 1
      if inner_depth < limit then
	 for q in node.traverse(p.head) do
	    debug_show_node_X(q, print_fn, limit, inner_depth)
	 end
      end
      prefix=k
   elseif pt=='rule' then
      s = base .. '(' .. print_scaled(p.height) .. '+'
         .. print_scaled(p.depth) .. ')x' .. print_scaled(p.width)
	 .. ', dir=' .. tostring(node.has_attribute(p, attr_dir))
      print_fn(s)
   elseif pt=='disc' then
      print_fn(s)
      local bid = inner_depth
      if inner_depth < limit then
         prefix, inner_depth = k.. 'p.', inner_depth + 1
	 for q in node.traverse(p.pre) do
	    debug_show_node_X(q, print_fn, limit, inner_depth)
	 end
         prefix = k.. 'P.'
	 for q in node.traverse(p.post) do
	    debug_show_node_X(q, print_fn, limit, inner_depth)
	 end
         prefix = k.. 'R.'
	 for q in node.traverse(p.replace) do
	    debug_show_node_X(q, print_fn, limit, inner_depth)
	 end
      end
      prefix=k
   elseif pt == 'glue' then
      s = base .. ' ' ..  print_spec(p)
      if get_attr_icflag(p)>icflag_table.KINSOKU
         and get_attr_icflag(p)<icflag_table.KANJI_SKIP then
         s = s .. ' (from JFM: priority ' .. get_attr_icflag(p)-icflag_table.FROM_JFM .. ')'
      elseif get_attr_icflag(p)==icflag_table.KANJI_SKIP then
	 s = s .. ' (kanjiskip)'
      elseif get_attr_icflag(p)==icflag_table.KANJI_SKIP_JFM then
	 s = s .. ' (kanjiskip, JFM specified)'
      elseif get_attr_icflag(p)==icflag_table.XKANJI_SKIP then
	 s = s .. ' (xkanjiskip)'
      elseif get_attr_icflag(p)==icflag_table.XKANJI_SKIP_JFM then
	 s = s .. ' (xkanjiskip, JFM specified)'
      end
      print_fn(s)
   elseif pt == 'kern' then
      s = base .. ' ' .. print_scaled(p.kern) .. 'pt'
      if p.subtype==2 then
	 s = s .. ' (for accent)'
      elseif get_attr_icflag(p)==icflag_table.IC_PROCESSED then
	 s = s .. ' (italic correction)'
      elseif get_attr_icflag(p)==icflag_table.LINEEND then
	 s = s .. ' (end-of-line)'
         -- elseif get_attr_icflag(p)==ITALIC then
         --    s = s .. ' (italic correction)'
      elseif get_attr_icflag(p)>icflag_table.KINSOKU
         and get_attr_icflag(p)<icflag_table.KANJI_SKIP then
	 s = s .. ' (from JFM: priority ' .. get_attr_icflag(p)-icflag_table.FROM_JFM .. ')'
      end
      print_fn(s)
   elseif pt == 'penalty' then
      s = base .. ' ' .. tostring(p.penalty)
      if get_attr_icflag(p)==icflag_table.KINSOKU then
	 s = s .. ' (for kinsoku)'
      end
      print_fn(s)
   elseif pt == 'dir' then
      s = base .. ' ' .. tostring(p.dir) .. ' (level ' .. tostring(p.level) .. ')'
      print_fn(s)
   elseif pt == 'whatsit' then
      s = base
      if p.subtype==sid_user then
	 local t = tostring(p.user_id) .. ' (' ..
	    luatexbase.get_user_whatsit_name(p.user_id) .. ') '
         if p.type ~= 110 then
            s = s .. ' userid:' .. t .. p.value
            print_fn(s)
         else
            s = s .. ' userid:' .. t .. '(node list)'
	    if p.user_id==userid_table.DIR then
	       s = s .. ' dir: ' .. tostring(node.has_attribute(p, attr_dir))
	    end
            print_fn(s)
	    local bid = inner_depth
            prefix, inner_depth =prefix.. '.', inner_depth + 1
            if inner_depth < limit then
	       for q in node.traverse(p.value) do
		  debug_show_node_X(q, print_fn, limit, inner_depth)
	       end
	    end
            prefix, inner_depth = k, bid
         end
      else
         s = s .. (node.subtype(p.subtype) or '')
	 if p.subtype==1 then
	    s = s .. ' stream=' .. p.stream
	    print_fn(s)
	    for i=1,#p.data do
	       print_fn(s .. '  [' .. i .. '] = ' .. tostring(p.data[i].csname))
	    end
	 else
	    print_fn(s)
	 end
      end
   -------- math node --------
   elseif pt=='noad' then
      s = base ; print_fn(s)
      if p.nucleus then
         prefix = k .. 'N'; debug_show_node_X(p.nucleus, print_fn, limit, inner_depth);
      end
      if p.sup then
         prefix = k .. '^'; debug_show_node_X(p.sup, print_fn, limit, inner_depth);
      end
      if p.sub then
         prefix = k .. '_'; debug_show_node_X(p.sub, print_fn, limit, inner_depth);
      end
      prefix = k;
   elseif pt=='math_char' then
      s = base .. ' fam: ' .. p.fam .. ' , char = ' .. utfchar(p.char)
      print_fn(s)
   elseif pt=='sub_box' or pt=='sub_mlist' then
      print_fn(base)
      if p.head then
         prefix = k .. '.';
	 for q in node.traverse(p.head) do
	    debug_show_node_X(q, print_fn, limit, inner_depth)
	 end
      end
   else
      print_fn(base)
   end
   p=node_next(p)
end
function luatexja.ext_show_node_list(head,depth,print_fn, lim)
   prefix = depth
   inner_depth = 0
   if head then
      while head do
         debug_show_node_X(head, print_fn, lim or 1/0, inner_depth); head = node_next(head)
      end
   else
      print_fn(prefix .. ' (null list)')
   end
end
function luatexja.ext_show_node(head,depth,print_fn, lim)
   prefix = depth
   inner_depth = 0
   if head then
      debug_show_node_X(head, print_fn, lim or 1/0, inner_depth)
   else
      print_fn(prefix .. ' (null list)')
   end
end

end