summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/context/base/mkiv/scrp-ini.lua
blob: 02b2891378e5a5de70899362d9c225f78d63f711 (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
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
if not modules then modules = { } end modules ['scrp-ini'] = {
    version   = 1.001,
    comment   = "companion to scrp-ini.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- We need to rewrite this a bit ... rather old code ... will be done when japanese
-- is finished.

local attributes, nodes, node = attributes, nodes, node

local trace_analyzing    = false  trackers.register("scripts.analyzing",        function(v) trace_analyzing   = v end)
local trace_injections   = false  trackers.register("scripts.injections",       function(v) trace_injections  = v end)
local trace_splitting    = false  trackers.register("scripts.splitting",        function(v) trace_splitting   = v end)
local trace_splitdetail  = false  trackers.register("scripts.splitting.detail", function(v) trace_splitdetail = v end)

local report_preprocessing = logs.reporter("scripts","preprocessing")
local report_splitting     = logs.reporter("scripts","splitting")

local utfbyte, utfsplit = utf.byte, utf.split
local gmatch = string.gmatch

local texsetattribute   = tex.setattribute

local nodecodes         = nodes.nodecodes
local unsetvalue        = attributes.unsetvalue

local implement         = interfaces.implement

local glyph_code        = nodecodes.glyph
local glue_code         = nodecodes.glue

local emwidths          = fonts.hashes.emwidths
local exheights         = fonts.hashes.exheights

local a_scriptinjection = attributes.private('scriptinjection')
local a_scriptsplitting = attributes.private('scriptsplitting')
local a_scriptstatus    = attributes.private('scriptstatus')

local fontdata          = fonts.hashes.identifiers
local allocate          = utilities.storage.allocate
local setnodecolor      = nodes.tracers.colors.set
local setmetatableindex = table.setmetatableindex

local enableaction      = nodes.tasks.enableaction
local disableaction     = nodes.tasks.disableaction

local nuts              = nodes.nuts
local tonut             = nuts.tonut
local tonode            = nuts.tonode

local getnext           = nuts.getnext
local getchar           = nuts.getchar
local getfont           = nuts.getfont
local getid             = nuts.getid
local getattr           = nuts.getattr
local setattr           = nuts.setattr
local isglyph           = nuts.isglyph

local insert_node_after = nuts.insert_after
local first_glyph       = nuts.first_glyph
local traverse_id       = nuts.traverse_id
local traverse_char     = nuts.traverse_char

local nodepool          = nuts.pool

local new_glue          = nodepool.glue
local new_rule          = nodepool.rule
local new_penalty       = nodepool.penalty

scripts                 = scripts or { }
local scripts           = scripts

scripts.hash            = scripts.hash or { }
local hash              = scripts.hash

local handlers          = allocate()
scripts.handlers        = handlers

local injectors         = allocate()
scripts.injectors       = handlers

local splitters         = allocate()
scripts.splitters       = splitters

local hash = { -- we could put these presets in char-def.lua
    --
    -- half width opening parenthesis
    --
    [0x0028] = "half_width_open",
    [0x005B] = "half_width_open",
    [0x007B] = "half_width_open",
    [0x2018] = "half_width_open", -- ‘
    [0x201C] = "half_width_open", -- “
    --
    -- full width opening parenthesis
    --
    [0x3008] = "full_width_open", -- 〈   Left book quote
    [0x300A] = "full_width_open", -- 《   Left double book quote
    [0x300C] = "full_width_open", -- 「   left quote
    [0x300E] = "full_width_open", -- 『   left double quote
    [0x3010] = "full_width_open", -- 【   left double book quote
    [0x3014] = "full_width_open", -- 〔   left book quote
    [0x3016] = "full_width_open", --〖   left double book quote
    [0x3018] = "full_width_open", --     left tortoise bracket
    [0x301A] = "full_width_open", --     left square bracket
    [0x301D] = "full_width_open", --     reverse double prime qm
    [0xFF08] = "full_width_open", -- (   left parenthesis
    [0xFF3B] = "full_width_open", -- [   left square brackets
    [0xFF5B] = "full_width_open", -- {   left curve bracket
    --
    -- half width closing parenthesis
    --
    [0x0029] = "half_width_close",
    [0x005D] = "half_width_close",
    [0x007D] = "half_width_close",
    [0x2019] = "half_width_close", -- ’   right quote, right
    [0x201D] = "half_width_close", -- ”   right double quote
    --
    -- full width closing parenthesis
    --
    [0x3009] = "full_width_close", -- 〉   book quote
    [0x300B] = "full_width_close", -- 》   double book quote
    [0x300D] = "full_width_close", -- 」   right quote, right
    [0x300F] = "full_width_close", -- 』   right double quote
    [0x3011] = "full_width_close", -- 】   right double book quote
    [0x3015] = "full_width_close", -- 〕   right book quote
    [0x3017] = "full_width_close", -- 〗  right double book quote
    [0x3019] = "full_width_close", --     right tortoise bracket
    [0x301B] = "full_width_close", --     right square bracket
    [0x301E] = "full_width_close", --     double prime qm
    [0x301F] = "full_width_close", --     low double prime qm
    [0xFF09] = "full_width_close", -- )   right parenthesis
    [0xFF3D] = "full_width_close", -- ]   right square brackets
    [0xFF5D] = "full_width_close", -- }   right curve brackets
    --
    [0xFF62] = "half_width_open", --     left corner bracket
    [0xFF63] = "half_width_close", --     right corner bracket
    --
    -- vertical opening vertical
    --
    -- 0xFE35, 0xFE37, 0xFE39,  0xFE3B,  0xFE3D,  0xFE3F,  0xFE41,  0xFE43,  0xFE47,
    --
    -- vertical closing
    --
    -- 0xFE36, 0xFE38, 0xFE3A,  0xFE3C,  0xFE3E,  0xFE40,  0xFE42,  0xFE44,  0xFE48,
    --
    -- half width opening punctuation
    --
    -- <empty>
    --
    -- full width opening punctuation
    --
    --  0x2236, -- ∶
    --  0xFF0C, -- ,
    --
    -- half width closing punctuation_hw
    --
    [0x0021] = "half_width_close", -- !
    [0x002C] = "half_width_close", -- ,
    [0x002E] = "half_width_close", -- .
    [0x003A] = "half_width_close", -- :
    [0x003B] = "half_width_close", -- ;
    [0x003F] = "half_width_close", -- ?
    [0xFF61] = "half_width_close", -- hw full stop
    --
    -- full width closing punctuation
    --
    [0x3001] = "full_width_close", -- 、
    [0x3002] = "full_width_close", -- 。
    [0xFF0C] = "full_width_close", -- ,
    [0xFF0E] = "full_width_close", --
    --
    -- depends on font
    --
    [0xFF01] = "full_width_close", -- !
    [0xFF1F] = "full_width_close", -- ?
    --
    [0xFF1A] = "full_width_punct", -- :
    [0xFF1B] = "full_width_punct", -- ;
    --
    -- non starter
    --
    [0x3005] = "non_starter", [0x3041] = "non_starter", [0x3043] = "non_starter", [0x3045] = "non_starter", [0x3047] = "non_starter",
    [0x3049] = "non_starter", [0x3063] = "non_starter", [0x3083] = "non_starter", [0x3085] = "non_starter", [0x3087] = "non_starter",
    [0x308E] = "non_starter", [0x3095] = "non_starter", [0x3096] = "non_starter", [0x309B] = "non_starter", [0x309C] = "non_starter",
    [0x309D] = "non_starter", [0x309E] = "non_starter", [0x30A0] = "non_starter", [0x30A1] = "non_starter", [0x30A3] = "non_starter",
    [0x30A5] = "non_starter", [0x30A7] = "non_starter", [0x30A9] = "non_starter", [0x30C3] = "non_starter", [0x30E3] = "non_starter",
    [0x30E5] = "non_starter", [0x30E7] = "non_starter", [0x30EE] = "non_starter", [0x30F5] = "non_starter", [0x30F6] = "non_starter",
    [0x30FC] = "non_starter", [0x30FD] = "non_starter", [0x30FE] = "non_starter", [0x31F0] = "non_starter", [0x31F1] = "non_starter",
    [0x30F2] = "non_starter", [0x30F3] = "non_starter", [0x30F4] = "non_starter", [0x31F5] = "non_starter", [0x31F6] = "non_starter",
    [0x30F7] = "non_starter", [0x30F8] = "non_starter", [0x30F9] = "non_starter", [0x31FA] = "non_starter", [0x31FB] = "non_starter",
    [0x30FC] = "non_starter", [0x30FD] = "non_starter", [0x30FE] = "non_starter", [0x31FF] = "non_starter",
    --
    -- hyphenation
    --
    [0x2026] = "hyphen", -- …   ellipsis
    [0x2014] = "hyphen", -- —   hyphen
    --
    [0x1361] = "ethiopic_word",
    [0x1362] = "ethiopic_sentence",
    --
}

local function provide(t,k)
    local v
    if not tonumber(k)                     then v = false
    elseif (k >= 0x03040 and k <= 0x030FF)
        or (k >= 0x031F0 and k <= 0x031FF)
        or (k >= 0x032D0 and k <= 0x032FE)
        or (k >= 0x0FF00 and k <= 0x0FFEF) then v = "katakana"
    elseif (k >= 0x03400 and k <= 0x04DFF)
        or (k >= 0x04E00 and k <= 0x09FFF)
        or (k >= 0x0F900 and k <= 0x0FAFF)
        or (k >= 0x20000 and k <= 0x2A6DF)
        or (k >= 0x2F800 and k <= 0x2FA1F) then v = "chinese"
    elseif (k >= 0x0AC00 and k <= 0x0D7A3) then v = "korean"
    elseif (k >= 0x01100 and k <= 0x0115F) then v = "jamo_initial"
    elseif (k >= 0x01160 and k <= 0x011A7) then v = "jamo_medial"
    elseif (k >= 0x011A8 and k <= 0x011FF) then v = "jamo_final"
    elseif (k >= 0x01200 and k <= 0x0139F) then v = "ethiopic_syllable"
                                           else v = false
    end
    t[k] = v
    return v
end

setmetatableindex(hash,provide) -- should come from char-def

scripts.hash = hash

local numbertodataset = allocate()
local numbertohandler = allocate()

--~ storage.register("scripts/hash", hash, "scripts.hash")

scripts.numbertodataset = numbertodataset
scripts.numbertohandler = numbertohandler

local defaults = {
    inter_char_shrink_factor          = 0,
    inter_char_shrink_factor          = 0,
    inter_char_stretch_factor         = 0,
    inter_char_half_shrink_factor     = 0,
    inter_char_half_stretch_factor    = 0,
    inter_char_quarter_shrink_factor  = 0,
    inter_char_quarter_stretch_factor = 0,
    inter_char_hangul_penalty         = 0,

    inter_word_stretch_factor         = 0,
}

scripts.defaults = defaults -- so we can add more

function scripts.installmethod(handler)
    local name = handler.name
    handlers[name] = handler
    local attributes = { }
    local datasets = handler.datasets
    if not datasets or not datasets.default then
        report_preprocessing("missing (default) dataset in script %a",name)
        datasets.default = { } -- slower but an error anyway
    end
    for k, v in next, datasets do
        setmetatableindex(v,defaults)
    end
    setmetatable(attributes, {
        __index = function(t,k)
            local v = datasets[k] or datasets.default
            local a = unsetvalue
            if v then
                v.name = name -- for tracing
                a = #numbertodataset + 1
                numbertodataset[a] = v
                numbertohandler[a] = handler
            end
            t[k] = a
            return a
        end
    } )
    handler.attributes = attributes
end

function scripts.installdataset(specification) -- global overload
    local method  = specification.method
    local name    = specification.name
    local dataset = specification.dataset
    if method and name and dataset then
        local parent  = specification.parent or ""
        local handler = handlers[method]
        if handler then
            local datasets = handler.datasets
            if datasets then
                local defaultset = datasets.default
                if defaultset then
                    if parent ~= "" then
                        local p = datasets[parent]
                        if p then
                            defaultset = p
                        else
                            report_preprocessing("dataset, unknown parent %a for method %a",parent,method)
                        end
                    end
                    setmetatable(dataset,defaultset)
                    local existing = datasets[name]
                    if existing then
                        for k, v in next, existing do
                            existing[k] = dataset
                        end
                    else
                        datasets[name] = dataset
                    end
                else
                    report_preprocessing("dataset, no default for method %a",method)
                end
            else
                report_preprocessing("dataset, no datasets for method %a",method)
            end
        else
            report_preprocessing("dataset, no method %a",method)
        end
    else
        report_preprocessing("dataset, invalid specification") -- maybe report table
    end
end

local injectorenabled = false
local splitterenabled = false

function scripts.set(name,method,preset)
    local handler = handlers[method]
    if handler then
        if handler.injector then
            if not injectorenabled then
                enableaction("processors","scripts.injectors.handler")
                injectorenabled = true
            end
            texsetattribute(a_scriptinjection,handler.attributes[preset] or unsetvalue)
        end
        if handler.splitter then
            if not splitterenabled then
                enableaction("processors","scripts.splitters.handler")
                splitterenabled = true
            end
            texsetattribute(a_scriptsplitting,handler.attributes[preset] or unsetvalue)
        end
        if handler.initializer then
            handler.initializer(handler)
            handler.initializer = nil
        end
    else
        texsetattribute(a_scriptinjection,unsetvalue)
        texsetattribute(a_scriptsplitting,unsetvalue)
    end
end

function scripts.reset()
    texsetattribute(a_scriptinjection,unsetvalue)
    texsetattribute(a_scriptsplitting,unsetvalue)
end

-- the following tables will become a proper installer (move to cjk/eth)
--
-- 0=gray 1=red 2=green 3=blue 4=yellow 5=magenta 6=cyan 7=x-yellow 8=x-magenta 9=x-cyan

local scriptcolors = allocate {  -- todo: just named colors
    korean            = "trace:0",
    chinese           = "trace:0",
    katakana          = "trace:0",
    hiragana          = "trace:0",
    full_width_open   = "trace:1",
    full_width_close  = "trace:2",
    half_width_open   = "trace:3",
    half_width_close  = "trace:4",
    full_width_punct  = "trace:5",
    hyphen            = "trace:5",
    non_starter       = "trace:6",
    jamo_initial      = "trace:7",
    jamo_medial       = "trace:8",
    jamo_final        = "trace:9",
    ethiopic_syllable = "trace:1",
    ethiopic_word     = "trace:2",
    ethiopic_sentence = "trace:3",
}

scripts.colors = scriptcolors

local numbertocategory = allocate { -- rather bound to cjk ... will be generalized
    "korean",
    "chinese",
    "katakana",
    "hiragana",
    "full_width_open",
    "full_width_close",
    "half_width_open",
    "half_width_close",
    "full_width_punct",
    "hyphen",
    "non_starter",
    "jamo_initial",
    "jamo_medial",
    "jamo_final",
    "ethiopic_syllable",
    "ethiopic_word",
    "ethiopic_sentence",
}

local categorytonumber = allocate(table.swapped(numbertocategory)) -- could be one table

scripts.categorytonumber = categorytonumber
scripts.numbertocategory = numbertocategory

local function colorize(start,stop)
    for n in traverse_id(glyph_code,start) do
        local kind = numbertocategory[getattr(n,a_scriptstatus)]
        if kind then
            local ac = scriptcolors[kind]
            if ac then
                setnodecolor(n,ac)
            end
        end
        if n == stop then
            break
        end
    end
end

local function traced_process(head,first,last,process,a)
    if start ~= last then
        local f, l = first, last
        local name = numbertodataset[a]
        name = name and name.name or "?"
        report_preprocessing("before %s: %s",name,nodes.tosequence(f,l))
        process(head,first,last)
        report_preprocessing("after %s: %s", name,nodes.tosequence(f,l))
    end
end

-- eventually we might end up with more extensive parsing
-- todo: pass t[start..stop] == original
--
-- one of the time consuming functions:

-- we can have a fonts.hashes.originals

function scripts.injectors.handler(head)
    head = tonut(head)
    local start = first_glyph(head) -- we already have glyphs here (subtype 1)
    if not start then
        return tonode(head), false
    else
        local last_a, normal_process, lastfont, originals = nil, nil, nil, nil
        local done, first, last, ok = false, nil, nil, false
        while start do
            local char, id = isglyph(start)
            if char then
                local a = getattr(start,a_scriptinjection)
                if a then
                    if a ~= last_a then
                        if first then
                            if ok then
                                if trace_analyzing then
                                    colorize(first,last)
                                end
                                if trace_injections then
                                    traced_process(head,first,last,normal_process,last_a)
                                else
                                    normal_process(head,first,last)
                                end
                                ok, done = false, true
                            end
                            first, last = nil, nil
                        end
                        last_a = a
                        local handler = numbertohandler[a]
                        normal_process = handler.injector
                    end
                    if normal_process then
                        -- wrong: originals are indices !
                        local font = getfont(start)
                        if font ~= lastfont then
                            originals = fontdata[font].resources
                            if resources then
                                originals = resources.originals
                            else
                                originals = nil -- can't happen
                            end
                            lastfont = font
                        end
                        if originals and type(originals) == "number" then
                            char = originals[char] or char
                        end
                        local h = hash[char]
                        if h then
                            setattr(start,a_scriptstatus,categorytonumber[h])
                            if not first then
                                first, last = start, start
                            else
                                last = start
                            end
                         -- if cjk == "chinese" or cjk == "korean" then -- we need to prevent too much ( ) processing
                                ok = true
                         -- end
                        elseif first then
                            if ok then
                                if trace_analyzing then
                                    colorize(first,last)
                                end
                                if trace_injections then
                                    traced_process(head,first,last,normal_process,last_a)
                                else
                                    normal_process(head,first,last)
                                end
                                ok, done = false, true
                            end
                            first, last = nil, nil
                        end
                    end
                elseif first then
                    if ok then
                        if trace_analyzing then
                            colorize(first,last)
                        end
                        if trace_injections then
                            traced_process(head,first,last,normal_process,last_a)
                        else
                            normal_process(head,first,last)
                        end
                        ok, done = false, true
                    end
                    first, last = nil, nil
                end
            elseif id == glue_code then
                if ok then
                    -- continue
                elseif first then
                    -- no chinese or korean
                    first, last = nil, nil
                end
            elseif first then
                if ok then
                    -- some chinese or korean
                    if trace_analyzing then
                        colorize(first,last)
                    end
                    if trace_injections then
                        traced_process(head,first,last,normal_process,last_a)
                    else
                        normal_process(head,first,last)
                    end
                    first, last, ok, done = nil, nil, false, true
                elseif first then
                    first, last = nil, nil
                end
            end
            start = getnext(start)
        end
        if ok then
            if trace_analyzing then
                colorize(first,last)
            end
            if trace_injections then
                traced_process(head,first,last,normal_process,last_a)
            else
                normal_process(head,first,last)
            end
            done = true
        end
        return tonode(head), done
    end
end

-- kind of experimental .. might move to it's own module

-- function scripts.splitters.handler(head)
--     return head, false
-- end

local function addwords(tree,data)
    if not tree then
        tree = { }
    end
    for word in gmatch(data,"%S+") do
        local root = tree
        local list = utfsplit(word,true)
        for i=1,#list do
            local l = utfbyte(list[i])
            local r = root[l]
            if not r then
                r = { }
                root[l] = r
            end
            if i == #list then
                r.final = word -- true -- could be something else, like word in case of tracing
            else
                root = r
            end
        end
    end
    return tree
end

local loaded = { }

function splitters.load(handler,files)
    local files  = handler.files
    local tree   = handler.tree or { }
    handler.tree = tree
    if not files then
        return
    elseif type(files) == "string" then
        files         = { files }
        handler.files = files
    end
    if trace_splitting then
        report_splitting("loading splitter data for language/script %a",handler.name)
    end
    loaded[handler.name or "unknown"] = (loaded[handler.name or "unknown"] or 0) + 1
    statistics.starttiming(loaded)
    for i=1,#files do
        local filename = files[i]
        local fullname = resolvers.findfile(filename)
        if fullname == "" then
            fullname = resolvers.findfile(filename .. ".gz")
        end
        if fullname ~= "" then
            if trace_splitting then
                report_splitting("loading file %a",fullname)
            end
            local suffix, gzipped = gzip.suffix(fullname)
            if suffix == "lua" then
                local specification = table.load(fullname,gzipped and gzip.load)
                 if specification then
                    local lists = specification.lists
                    if lists then
                        for i=1,#lists do
                            local entry = lists[i]
                            local data = entry.data
                            if data then
                                if entry.compression == "zlib" then
                                    data = zlib.decompress(data)
                                    if entry.length and entry.length ~= #data then
                                        report_splitting("compression error in file %a",fullname)
                                    end
                                end
                                if data then
                                    addwords(tree,data)
                                end
                            end
                        end
                    end
                end
            else
                local data = gzipped and io.loadgzip(fullname) or io.loaddata(fullname)
                if data then
                    addwords(tree,data)
                end
            end
        else
            report_splitting("unknown file %a",filename)
        end
    end
    statistics.stoptiming(loaded)
    return tree
end

statistics.register("loaded split lists", function()
    if next(loaded) then
        return string.format("%s, load time: %s",table.sequenced(loaded),statistics.elapsedtime(loaded))
    end
end)

-- function splitters.addlist(name,filename)
--     local handler = scripts.handlers[name]
--     if handler and filename then
--         local files = handler.files
--         if not files then
--             files = { }
--         elseif type(files) == "string" then
--             files = { files }
--         end
--         handler.files = files
--         if type(filename) == "string" then
--             filename = utilities.parsers.settings_to_array(filename)
--         end
--         if type(filename) == "table" then
--             for i=1,#filename do
--                 files[#files+1] = filenames[i]
--             end
--         end
--     end
-- end
--
-- commands.setscriptsplitterlist = splitters.addlist

local categories = characters.categories or { }

-- local function hit(root,head)
--     local current   = getnext(head)
--     local lastrun   = false
--     local lastfinal = false
--     while current and getid(current) == glyph_code do
--         local char = getchar(current)
--         local newroot = root[char]
--         if newroot then
--             local final = newroot.final
--             if final then
--                 lastrun   = current
--                 lastfinal = final
--             end
--             root = newroot
--         elseif categories[char] == "mn" then
--             -- continue
--         else
--             return lastrun, lastfinal
--         end
--         current = getnext(current)
--     end
--     if lastrun then
--         return lastrun, lastfinal
--     end
-- end

local function hit(root,head)
    local current   = getnext(head)
    local lastrun   = false
    local lastfinal = false
    while current do
        local char = isglyph(current)
        if char then
            local newroot = root[char]
            if newroot then
                local final = newroot.final
                if final then
                    lastrun   = current
                    lastfinal = final
                end
                root = newroot
            elseif categories[char] == "mn" then
                -- continue
            else
                return lastrun, lastfinal
            end
        else
            break
        end
    end
    if lastrun then
        return lastrun, lastfinal
    end
end

local tree, attr, proc

function splitters.handler(head) -- todo: also first_glyph test
    head = tonut(head)
    local current = head
    local done = false
    while current do
        if getid(current) == glyph_code then
            local a = getattr(current,a_scriptsplitting)
            if a then
                if a ~= attr then
                    local handler = numbertohandler[a]
                    tree = handler.tree or { }
                    attr = a
                    proc = handler.splitter
                end
                if proc then
                    local root = tree[getchar(current)]
                    if root then
                        -- we don't check for attributes in the hitter (yet)
                        local last, final = hit(root,current)
                        if last then
                            local next = getnext(last)
                            if next then
                                local nextchar = isglyph(next)
                                if not nextchar then
                                    -- we're done
                                elseif tree[nextchar] then
                                    if trace_splitdetail then
                                        if type(final) == "string" then
                                            report_splitting("advance %s processing between <%s> and <%c>","with",final,nextchar)
                                        else
                                            report_splitting("advance %s processing between <%c> and <%c>","with",char,nextchar)
                                        end
                                    end
                                    head, current = proc(handler,head,current,last,1)
                                    done = true
                                else
                                    if trace_splitdetail then
                                        -- could be punctuation
                                        if type(final) == "string" then
                                            report_splitting("advance %s processing between <%s> and <%c>","without",final,nextchar)
                                        else
                                            report_splitting("advance %s processing between <%c> and <%c>","without",char,nextchar)
                                        end
                                    end
                                    head, current = proc(handler,head,current,last,2)
                                    done = true
                                end
                            end
                        end
                    end
                end
            end
        end
        current = getnext(current)
    end
    return tonode(head), done
end

local function marker(head,current,font,color) -- could become: nodes.tracers.marker
    local ex = exheights[font]
    local em = emwidths [font]
    head, current = insert_node_after(head,current,new_penalty(10000))
    head, current = insert_node_after(head,current,new_glue(-0.05*em))
    head, current = insert_node_after(head,current,new_rule(0.05*em,1.5*ex,0.5*ex))
    setnodecolor(current,color)
    return head, current
end

local last_a, last_f, last_s, last_q

function splitters.insertafter(handler,head,first,last,detail)
    local a = getattr(first,a_scriptsplitting)
    local f = getfont(first)
    if a ~= last_a or f ~= last_f then
        last_s = emwidths[f] * numbertodataset[a].inter_word_stretch_factor
        last_a = a
        last_f = f
    end
    if trace_splitting then
        head, last = marker(head,last,f,detail == 2 and "trace:r" or "trace:g")
    end
    if ignore then
        return head, last
    else
        return insert_node_after(head,last,new_glue(0,last_s))
    end
end

-- word-xx.lua:
--
-- return {
--     comment   = "test",
--     copyright = "not relevant",
--     language  = "en",
--     timestamp = "2013-05-20 14:15:21",
--     version   = "1.00",
--     lists     = {
--         {
--          -- data = "we thrive information in thick worlds because of our marvelous and everyday capacity to select edit single out structure highlight group pair merge harmonize synthesize focus organize condense reduce boil down choose categorize catalog classify list abstract scan look into idealize isolate discriminate distinguish screen pigeonhole pick over sort integrate blend inspect filter lump skip smooth chunk average approximate cluster aggregate outline summarize itemize review dip into flip through browse glance into leaf through skim refine enumerate glean synopsize winnow the wheat from the chaff and separate the sheep from the goats",
--             data = "abstract aggregate and approximate average because blend boil browse capacity catalog categorize chaff choose chunk classify cluster condense dip discriminate distinguish down edit enumerate everyday filter flip focus from glance glean goats group harmonize highlight idealize in information inspect integrate into isolate itemize leaf list look lump marvelous merge of organize our out outline over pair pick pigeonhole reduce refine review scan screen select separate sheep single skim skip smooth sort structure summarize synopsize synthesize the thick thrive through to we wheat winnow worlds",
--         },
--     },
-- }

scripts.installmethod {
    name        = "test",
    splitter    = splitters.insertafter,
    initializer = splitters.load,
    files       = {
     -- "scrp-imp-word-test.lua",
        "word-xx.lua",
    },
    datasets    = {
        default = {
            inter_word_stretch_factor = 0.25, -- of quad
        },
    },
}

-- new plugin:

local registercontext   = fonts.specifiers.registercontext
local mergecontext      = fonts.specifiers.mergecontext

local otfscripts        = characters.otfscripts

local report_scripts    = logs.reporter("scripts","auto feature")
local trace_scripts     = false  trackers.register("scripts.autofeature",function(v) trace_scripts = v end)

local autofontfeature   = scripts.autofontfeature or { }
scripts.autofontfeature = autofontfeature

local cache_yes         = { }
local cache_nop         = { }

setmetatableindex(cache_yes,function(t,k) local v = { } t[k] = v return v end)
setmetatableindex(cache_nop,function(t,k) local v = { } t[k] = v return v end)

-- beware: we need to tag a done (otherwise too many extra instances ... but how
-- often unpack? wait till we have a bitmap
--
-- we can consider merging this in handlers.characters(head) at some point as there
-- already check for the dynamic attribute so it saves a pass, however, then we also
-- need to check for a_scriptinjection there which nils the benefit
--
-- we can consider cheating: set all glyphs in a word as the first one but it's not
-- playing nice

function autofontfeature.handler(head)
    for n in traverse_char(tonut(head)) do
     -- if getattr(n,a_scriptinjection) then
     --     -- already tagged by script feature, maybe some day adapt
     -- else
            local char   = getchar(n)
            local script = otfscripts[char]
            if script then
                local dynamic = getattr(n,0) or 0
                local font = getfont(n)
                if dynamic > 0 then
                    local slot = cache_yes[font]
                    local attr = slot[script]
                    if not attr then
                        attr = mergecontext(dynamic,name,2)
                        slot[script] = attr
                        if trace_scripts then
                            report_scripts("script: %s, trigger %C, dynamic: %a, variant: %a",script,char,attr,"extended")
                        end
                    end
                    if attr ~= 0 then
                        n[0] = attr
                        -- maybe set scriptinjection when associated
                    end
                else
                    local slot = cache_nop[font]
                    local attr = slot[script]
                    if not attr then
                        attr = registercontext(font,script,2)
                        slot[script] = attr
                        if trace_scripts then
                            report_scripts("script: %s, trigger %C, dynamic: %s, variant: %a",script,char,attr,"normal")
                        end
                    end
                    if attr ~= 0 then
                        setattr(n,0,attr)
                        -- maybe set scriptinjection when associated
                    end
                end
            end
     -- end
    end
    return head
end

function autofontfeature.enable()
    report_scripts("globally enabled")
    enableaction("processors","scripts.autofontfeature.handler")
end

function autofontfeature.disable()
    report_scripts("globally disabled")
    disableaction("processors","scripts.autofontfeature.handler")
end

implement {
    name      = "enableautofontscript",
    actions   = autofontfeature.enable
}

implement {
    name      = "disableautofontscript",
    actions   = autofontfeature.disable }

implement {
    name      = "setscript",
    actions   = scripts.set,
    arguments = { "string", "string", "string" }
}

implement {
    name      = "resetscript",
    actions   = scripts.reset
}