summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/context/base/publ-dat.lua
blob: 1e651c45bcd586d2f2b86d5cb1767fff9e37ab08 (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
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
if not modules then modules = { } end modules ['publ-dat'] = {
    version   = 1.001,
    comment   = "this module part of publication support",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- todo: strip the @ in the lpeg instead of on do_definition and do_shortcut
-- todo: store bibroot and bibrootdt
-- todo: dataset = datasets[dataset] => current = datasets[dataset]
-- todo: maybe split this file

--[[ldx--
<p>This is a prelude to integrated bibliography support. This file just loads
bibtex files and converts them to xml so that the we access the content
in a convenient way. Actually handling the data takes place elsewhere.</p>
--ldx]]--

if not characters then
    dofile(resolvers.findfile("char-utf.lua"))
    dofile(resolvers.findfile("char-tex.lua"))
end

local chardata  = characters.data
local lowercase = characters.lower

local lower, find, sub = string.lower, string.find, string.sub
local concat, copy, tohash = table.concat, table.copy, table.tohash
local next, type, rawget = next, type, rawget
local utfchar = utf.char
local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
local textoutf = characters and characters.tex.toutf
local settings_to_hash, settings_to_array = utilities.parsers.settings_to_hash, utilities.parsers.settings_to_array
local formatters = string.formatters
local sortedkeys, sortedhash, keys = table.sortedkeys, table.sortedhash, table.keys
local xmlcollected, xmltext, xmlconvert = xml.collected, xml.text, xml.convert
local setmetatableindex = table.setmetatableindex

-- todo: more allocate

local P, R, S, V, C, Cc, Cs, Ct, Carg, Cmt, Cp = lpeg.P, lpeg.R, lpeg.S, lpeg.V, lpeg.C, lpeg.Cc, lpeg.Cs, lpeg.Ct, lpeg.Carg, lpeg.Cmt, lpeg.Cp

local p_whitespace      = lpegpatterns.whitespace
local p_utf8character   = lpegpatterns.utf8character

local trace             = false  trackers.register("publications",            function(v) trace = v end)
local trace_duplicates  = true   trackers.register("publications.duplicates", function(v) trace = v end)

local report            = logs.reporter("publications")
local report_duplicates = logs.reporter("publications","duplicates")

local allocate          = utilities.storage.allocate

local commands          = commands
local implement         = interfaces.implement

publications            = publications or { }
local publications      = publications

local datasets          = publications.datasets or { }
publications.datasets   = datasets

local writers           = publications.writers or { }
publications.writers    = writers

local tables            = publications.tables or { }
publications.tables     = tables

publications.statistics = publications.statistics or { }
local publicationsstats = publications.statistics

local loaders           = publications.loaders or { }
publications.loaders    = loaders

local casters           = { }
publications.casters    = casters

-- local sorters           = { }
-- publications.sorters    = sorters
--
-- local indexers          = { }
-- publications.indexers   = indexers

local components        = { }
publications.components = components -- register components

local enhancers         = publications.enhancers or { }
publications.enhancers  = enhancers

local enhancer          = publications.enhancer or utilities.sequencers.new { arguments = "dataset" }
publications.enhancer   = enhancer

utilities.sequencers.appendgroup(enhancer,"system") -- private

publicationsstats.nofbytes       = 0
publicationsstats.nofdefinitions = 0
publicationsstats.nofshortcuts   = 0
publicationsstats.nofdatasets    = 0

local privates = allocate {
    category      = true,
    tag           = true,
    index         = true,
    suffix        = true,
    specification = true,
}

local specials = allocate {
    key      = true,
    crossref = true,
    keywords = true,
    language = true,
    comment  = true,
}

local implicits = allocate {
    category = "implicit",
    tag      = "implicit",
    key      = "implicit",
    keywords = "implicit",
    language = "implicit",
    crossref = "implicit",
}

local origins = allocate {
    "optional",
    "extra",
    "required",
    "virtual",
}

local virtuals = allocate {
    "authoryear",
    "authoryears",
    "authornum",
    "num",
    "suffix",
}

local defaulttypes = allocate {
    author    = "author",
    editor    = "author",
    publisher = "author",
    page      = "pagenumber",
    pages     = "pagenumber",
    keywords  = "keyword",
    doi       = "url",
    url       = "url",
}

local defaultsets = allocate {
    page = { "page", "pages" },
}

tables.implicits = implicits
tables.origins   = origins
tables.virtuals  = virtuals
tables.types     = defaulttypes
tables.sets      = defaultsets
tables.privates  = privates
tables.specials  = specials

local variables  = interfaces and interfaces.variables or setmetatableindex("self")

local v_all      = variables.all
local v_default  = variables.default

if not publications.usedentries then
    function publications.usedentries()
        return { }
    end
end

local xmlplaceholder = "<?xml version='1.0' standalone='yes'?>\n<bibtex></bibtex>"

local defaultshortcuts = allocate {
    jan =  "1",
    feb =  "2",
    mar =  "3",
    apr =  "4",
    may =  "5",
    jun =  "6",
    jul =  "7",
    aug =  "8",
    sep =  "9",
    oct = "10",
    nov = "11",
    dec = "12",
}

local space      = p_whitespace^0
local separator  = space * "+" * space
local l_splitter = lpeg.tsplitat(separator)
local d_splitter = lpeg.splitat (separator)

local unknownfield = function(t,k)
    local v = "extra"
    t[k] = v
    return v
end

local unknowncategory = function(t,k)
    local v = {
        required = false,
        optional = false,
        virtual  = false,
        fields   = setmetatableindex(unknownfield), -- this will remember them
        types    = unknowntypes,
        sets     = setmetatableindex(defaultsets),  -- new, but rather small
    }
    t[k] = v
    return v
end

local unknowntype = function(t,k)
    local v = "string"
    t[k] = v
    return v
end

local default = {
    name       = name,
    version    = "1.00",
    comment    = "unknown specification.",
    author     = "anonymous",
    copyright  = "no one",
    categories = setmetatableindex(unknowncategory),
    types      = setmetatableindex(defaulttypes,unknowntype),
}

-- maybe at some point we can have a handlers table with per field
-- a found, fetch, ... method

local function checkfield(specification,category,data)
    local list    = setmetatableindex({},implicits)
    data.fields   = list
    data.category = category
    local sets    = data.sets or { }
    for i=1,#origins do
        local t = origins[i]
        local d = data[t]
        if d then
            for i=1,#d do
                local di = d[i]
                di = sets[di] or di
                if type(di) == "table" then
                    for i=1,#di do
                        list[di[i]] = t
                    end
                else
                    list[di] = t
                end
            end
        else
            data[t] = { }
        end
    end
    return data
end

local specifications = setmetatableindex(function(t,name)
    if not name then
        return default -- initializer
    end
    local filename = formatters["publ-imp-%s.lua"](name)
    local fullname = resolvers.findfile(filename) or ""
    if fullname == "" then
        report("no data definition file %a for %a",filename,name)
        return default
    end
    local specification = table.load(fullname)
    if not specification then
        report("invalid data definition file %a for %a",fullname,name)
        return default
    end
    --
    local categories = specification.categories
    if not categories then
        categories = { }
        specification.categories = categories
    end
    setmetatableindex(categories,unknowncategory)
    --
    local types = specification.types
    if not types then
        types = defaulttypes
        specification.types = types
    end
    setmetatableindex(types,unknowntype)
    --
    local fields = setmetatableindex(unknownfield)
    specification.fields = fields
    --
    local virtual = specification.virtual
    if virtual == nil then -- so false is valid
        virtual = { }
    elseif virtual == false then
        virtual = { }
    elseif type(virtual) ~= table then
        virtual = virtuals
    end
    specification.virtual = virtual
    specification.virtualfields = tohash(virtual)
    --
    for category, data in next, categories do
        categories[category] = checkfield(specification,category,copy(data)) -- we make sure we have no clones
    end
    --
    t[name] = specification
    --
    return specification
end)

publications.specifications = specifications

function publications.setcategory(target,category,data)
    local specification = specifications[target]
    specification.categories[category] = checkfield(specification,category,data)
end

function publications.parenttag(dataset,tag)
    if not dataset or not tag then
        report("error in specification, dataset %a, tag %a",dataset,tag)
    elseif find(tag,"%+") then
        local tags    = lpegmatch(l_splitter,tag)
        local parent  = tags[1]
        local current = datasets[dataset]
        local luadata = current.luadata
        local first   = luadata[parent]
        if first then
            local combined = first.combined
            if not combined then
                combined = { }
                first.combined = combined
            end
            -- add new ones but only once
            for i=2,#tags do
                local tag = tags[i]
                for j=1,#combined do
                    if combined[j] == tag then
                        tag = false
                    end
                end
                if tag then
                    local entry = luadata[tag]
                    if entry then
                        combined[#combined+1] = tag
                        if combined[tag] then
                            report("error in combination, dataset %a, tag %a, parent %a, ignored %a",dataset,tag,combined[tag],parent)
                        else
                            report("combining, dataset %a, tag %a, parent %a",dataset,tag,parent)
                            current.combined[tag] = parent
                        end
                    end
                end
            end
            return parent
        end
    end
    return tag or ""
end

function publications.new(name)
    publicationsstats.nofdatasets = publicationsstats.nofdatasets + 1
    local dataset = {
        name       = name or "dataset " .. publicationsstats.nofdatasets,
        nofentries = 0,
        shortcuts  = { },
        luadata    = { },
        suffixes   = { },
        xmldata    = xmlconvert(xmlplaceholder),
        details    = { },
        ordered    = { },
        nofbytes   = 0,
        entries    = nil, -- empty == all
        sources    = { },
        loaded     = { },
        fields     = { },
        userdata   = { },
        used       = { },
        commands   = { }, -- for statistical purposes
        status     = {
            resources = false,
            userdata  = false,
        },
        specifications = {
            -- used specifications
        },
        suffixed   = false,
        combined   = { },
    }
    -- we delay details till we need it (maybe we just delay the
    -- individual fields but that is tricky as there can be some
    -- depedencies)
    return dataset
end

setmetatableindex(datasets,function(t,k)
    if type(k) == "table" then
        return k -- so we can use this accessor as checker
    else
        local v = publications.new(k)
        datasets[k] = v
        return v
    end
end)

local function getindex(dataset,luadata,tag)
    local found = luadata[tag]
    if found then
        local index = found.index or 0
        dataset.ordered[tag] = index
        return index
    else
        local index = dataset.nofentries + 1
        dataset.nofentries = index
        dataset.ordered[index] = tag
        return index
    end
end

publications.getindex = getindex

do

    -- we apply some normalization

    local space     = S(" \t\n\r\f") -- / " "
    local collapsed = space^1/" "
    ----- csletter  = R("az","AZ")
    local csletter  = lpegpatterns.csletter

    ----- command   = P("\\") * Cc("btxcmd{") * (R("az","AZ")^1) * Cc("}")
    ----- command   = P("\\") * (Carg(1) * C(R("az","AZ")^1) / function(list,c) list[c] = (list[c] or 0) + 1 return "btxcmd{" .. c .. "}" end)
    ----- command   = P("\\") * (Carg(1) * C(R("az","AZ")^1) * space^0 / function(list,c) list[c] = (list[c] or 0) + 1 return "btxcmd{" .. c .. "}" end)
    local command   = P("\\") * (Carg(1) * C(csletter^1) * space^0 / function(list,c) list[c] = (list[c] or 0) + 1 return "btxcmd{" .. c .. "}" end)
    local whatever  = P("\\") * P(" ")^1 / " "
                    + P("\\") * ( P("hbox") + P("raise") ) -- bah
    local somemath  = P("$") * ((1-P("$"))^1) * P("$") -- let's not assume nested math
    ----- character = lpegpatterns.utf8character
    local any       = P(1)
    local done      = P(-1)
 -- local one_l     = P("{")  / ""
 -- local one_r     = P("}")  / ""
 -- local two_l     = P("{{") / ""
 -- local two_r     = P("}}") / ""
    local zero_l_r  = P("{}") / "" * #P(1)
    local special   = P("#")  / "\\letterhash "

    local filter_0  = S('\\{}#')
    local filter_1  = (1-filter_0)^0 * filter_0
    local filter_2  = Cs(
    -- {{...}} ... {{...}}
    --     two_l * (command + special + any - two_r - done)^0 * two_r * done +
    --     one_l * (command + special + any - one_r - done)^0 * one_r * done +
                (
                    somemath +
                    whatever +
                    command +
                    special +
                    collapsed +
                    zero_l_r +
                    any
                )^0
    )

    -- Currently we expand shortcuts and for large ones (like the acknowledgements
    -- in tugboat.bib) this is not that efficient. However, eventually strings get
    -- hashed again.

    local function do_shortcut(key,value,dataset)
        publicationsstats.nofshortcuts = publicationsstats.nofshortcuts + 1
        dataset.shortcuts[key] = value
    end

    -- todo: categories : metatable that lowers and also counts
    -- todo: fields     : metatable that lowers

    local tags = table.setmetatableindex("table")

    local function do_definition(category,tag,tab,dataset)
        publicationsstats.nofdefinitions = publicationsstats.nofdefinitions + 1
        if tag == "" then
            tag = "no-tag-set"
        end
        local fields  = dataset.fields
        local luadata = dataset.luadata
        local hashtag = tag
        if luadata[tag] then
            local t = tags[tag]
            local d = dataset.name
            local n = (t[d] or 0) + 1
            t[d] = n
            hashtag = tag .. "-" .. n
            if trace_duplicates then
                local p = { }
                for k, v in sortedhash(t) do
                    p[#p+1] = formatters["%s:%s"](k,v)
                end
                report_duplicates("tag %a is present multiple times: % t, assigning hashtag %a",tag,p,hashtag)
            end
        end
        local index  = getindex(dataset,luadata,hashtag)
        local entries = {
            category = lower(category),
            tag      = tag,
            index    = index,
        }
        for i=1,#tab,2 do
            local original   = tab[i]
            local normalized = fields[original]
            if not normalized then
                normalized = lower(original) -- we assume ascii fields
                fields[original] = normalized
            end
         -- if entries[normalized] then
            if rawget(entries,normalized) then
                if trace_duplicates then
                    report_duplicates("redundant field %a is ignored for tag %a in dataset %a",normalized,tag,dataset.name)
                end
            else
                local value = tab[i+1]
                value = textoutf(value)
                if lpegmatch(filter_1,value) then
                    value = lpegmatch(filter_2,value,1,dataset.commands) -- we need to start at 1 for { }
                end
                if normalized == "crossref" then
                    local parent = luadata[value]
                    if parent then
                        setmetatableindex(entries,parent)
                    else
                        -- warning
                    end
                end
                entries[normalized] = value
            end
        end
        luadata[hashtag] = entries
    end

    local function resolve(s,dataset)
        return dataset.shortcuts[s] or defaultshortcuts[s] or s -- can be number
    end

    local pattern = p_whitespace^0
                  * C(P("message") + P("warning") + P("error") + P("comment")) * p_whitespace^0 * P(":")
                  * p_whitespace^0
                  * C(P(1)^1)

    local function do_comment(s,dataset)
        local how, what = lpegmatch(pattern,s)
        if how and what then
            local t = string.splitlines(utilities.strings.striplines(what))
            local b = file.basename(dataset.fullname or dataset.name or "unset")
            for i=1,#t do
                report("%s > %s : %s",b,how,t[i])
            end
        end
    end

    local percent    = P("%")
    local start      = P("@")
    local comma      = P(",")
    local hash       = P("#")
    local escape     = P("\\")
    local single     = P("'")
    local double     = P('"')
    local left       = P('{')
    local right      = P('}')
    local both       = left + right
    local lineending = S("\n\r")
    local space      = S(" \t\n\r\f") -- / " "
    local spacing    = space^0
    local equal      = P("=")
    ----- collapsed  = (space^1)/ " "
    local collapsed  = p_whitespace^1/" "
    local nospaces   = p_whitespace^1/""

    local p_left     = (p_whitespace^0 * left) / ""
    local p_right    = (right * p_whitespace^0) / ""

    local balanced   = P {
        [1] = ((escape * (left+right)) + (collapsed + 1 - (left+right))^1 + V(2))^0,
        [2] = left * V(1) * right,
    }

 -- local unbalanced = P {
 --     [1] = left * V(2) * right,
 --     [2] = ((escape * (left+right)) + (collapsed + 1 - (left+right))^1 + V(1))^0,
 -- }

    local unbalanced = (left/"") * balanced * (right/"") * P(-1)

    local keyword    = C((R("az","AZ","09") + S("@_:-"))^1)
    local key        = C((1-space-equal)^1)
    local tag        = C((1-space-comma)^0)
    local reference  = keyword
    local category   = C((1-space-left)^1)
    local s_quoted   = ((escape*single) + collapsed + (1-single))^0
    local d_quoted   = ((escape*double) + collapsed + (1-double))^0

    local b_value    = p_left * balanced * p_right
 -- local u_value    = p_left * unbalanced * p_right -- get rid of outer { }
 -- local s_value    = (single/"") * (u_value + s_quoted) * (single/"")
 -- local d_value    = (double/"") * (u_value + d_quoted) * (double/"")
    local s_value    = (single/"") * (unbalanced + s_quoted) * (single/"")
    local d_value    = (double/"") * (unbalanced + d_quoted) * (double/"")
    local r_value    = reference * Carg(1) /resolve

    local somevalue  = d_value + b_value + s_value + r_value
    local value      = Cs((somevalue * ((spacing * hash * spacing)/"" * somevalue)^0))

    value = value / function(s) return lpegmatch(lpegpatterns.stripper,s) end

    local forget     = percent^1 * (1-lineending)^0
    local spacing    = spacing * forget^0 * spacing
    local assignment = spacing * key * spacing * equal * spacing * value * spacing
    local definition = category * spacing * left * spacing * tag * spacing * comma * Ct((assignment * comma^0)^0) * spacing * right * Carg(1) / do_definition

    local crapword   = C((1-space-left)^1)
    local shortcut   = Cmt(crapword,function(_,p,s) return lower(s) == "string"  and p end) * spacing * left * ((assignment * Carg(1))/do_shortcut * comma^0)^0  * spacing * right
    local comment    = Cmt(crapword,function(_,p,s) return lower(s) == "comment" and p end) * spacing * lpegpatterns.argument * Carg(1) / do_comment

    local casecrap   = #S("sScC") * (shortcut + comment)

    local bibtotable = (space + forget + P("@") * (casecrap + definition) + 1)^0

    -- todo \%

    -- loadbibdata  -> dataset.luadata
    -- loadtexdata  -> dataset.luadata
    -- loadluadata  -> dataset.luadata

    -- converttoxml -> dataset.xmldata from dataset.luadata

    function publications.loadbibdata(dataset,content,source,kind)
        if not source then
            report("invalid source for dataset %a",dataset)
            return
        end
        local current = datasets[dataset]
        local size = #content
        if size == 0 then
            report("empty source %a for dataset %a",source,current.name)
        else
            report("adding bib data to set %a from source %a",current.name,source)
        end
        statistics.starttiming(publications)
        publicationsstats.nofbytes = publicationsstats.nofbytes + size
        current.nofbytes = current.nofbytes + size
        if source then
            table.insert(current.sources, { filename = source, checksum = md5.HEX(content) })
            current.loaded[source] = kind or true
        end
        current.newtags = #current.luadata > 0 and { } or current.newtags
        lpegmatch(bibtotable,content or "",1,current)
        statistics.stoptiming(publications)
    end

end

do

    -- we could use xmlescape again

    local cleaner_0 = S('<>&')
    local cleaner_1 = (1-cleaner_0)^0 * cleaner_0
    local cleaner_2 = Cs ( (
        P("<") / "&lt;" +
        P(">") / "&gt;" +
        P("&") / "&amp;" +
        P(1)
    )^0)

    local compact = false -- can be a directive but then we also need to deal with newlines ... not now

    function publications.converttoxml(dataset,nice,dontstore,usedonly,subset) -- we have fields !
        local current = datasets[dataset]
        local luadata = subset or (current and current.luadata)
        if luadata then
            statistics.starttiming(publications)
            --
            local result, r, n = { }, 0, 0
            local usedonly = usedonly and publications.usedentries()
            --
            r = r + 1 ; result[r] = "<?xml version='1.0' standalone='yes'?>"
            r = r + 1 ; result[r] = "<bibtex>"
            --
            if nice then -- will be default
                local f_entry_start = formatters[" <entry tag='%s' category='%s' index='%s'>"]
                local s_entry_stop  = " </entry>"
                local f_field       = formatters["  <field name='%s'>%s</field>"]
                for tag, entry in sortedhash(luadata) do
                    if not usedonly or usedonly[tag] then
                        r = r + 1 ; result[r] = f_entry_start(tag,entry.category,entry.index)
                        for key, value in sortedhash(entry) do
                            if key ~= "tag" and key ~= "category" and key ~= "index" then
                                if lpegmatch(cleaner_1,value) then
                                    value = lpegmatch(cleaner_2,value)
                                end
                                if value ~= "" then
                                    r = r + 1 ; result[r] = f_field(key,value)
                                end
                            end
                        end
                        r = r + 1 ; result[r] = s_entry_stop
                        n = n + 1
                    end
                end
            else
                local f_entry_start = formatters["<entry tag='%s' category='%s' index='%s'>"]
                local s_entry_stop  = "</entry>"
                local f_field       = formatters["<field name='%s'>%s</field>"]
                for tag, entry in next, luadata do
                    if not usedonly or usedonly[tag] then
                        r = r + 1 ; result[r] = f_entry_start(entry.tag,entry.category,entry.index)
                        for key, value in next, entry do
                            if key ~= "tag" and key ~= "category" and key ~= "index" then
                                if lpegmatch(cleaner_1,value) then
                                    value = lpegmatch(cleaner_2,value)
                                end
                                if value ~= "" then
                                    r = r + 1 ; result[r] = f_field(key,value)
                                end
                            end
                        end
                        r = r + 1 ; result[r] = s_entry_stop
                        n = n + 1
                    end
                end
            end
            --
            r = r + 1 ; result[r] = "</bibtex>"
            --
            result = concat(result,nice and "\n" or nil)
            --
            if dontstore then
                -- indeed
            else
                statistics.starttiming(xml)
                current.xmldata = xmlconvert(result, {
                    resolve_entities            = true,
                    resolve_predefined_entities = true, -- in case we have escaped entities
                 -- unify_predefined_entities   = true, -- &#038; -> &amp;
                    utfize_entities             = true,
                } )
                statistics.stoptiming(xml)
                if lxml then
                    lxml.register(formatters["btx:%s"](current.name),current.xmldata)
                end
            end
            statistics.stoptiming(publications)
            return result, n
        end
    end

end

do

    local function resolvedname(dataset,filename)
        local current = datasets[dataset]
        if type(filename) ~= "string" then
            report("invalid filename %a",tostring(filename))
        end
        local fullname = resolvers.findfile(filename,"bib")
        if fullname == "" then
            fullname = resolvers.findfile(filename) -- let's not be too picky
        end
        if not fullname or fullname == "" then
            report("no file %a",filename)
            current.fullname = filename
            return current, false
        else
            current.fullname = fullname
            return current, fullname
        end
    end

    publications.resolvedname = resolvedname

    local cleaner = false
    local cleaned = false

    function loaders.registercleaner(what,fullname)
        if not fullname or fullname == "" then
            report("no %s file %a",what,fullname)
            return
        end
        local list = table.load(fullname)
        if not list then
            report("invalid %s file %a",what,fullname)
            return
        end
        list = list.replacements
        if not list then
            report("no replacement table in %a",fullname)
            return
        end
        if cleaned then
            report("adding replacements from %a",fullname)
            for k, v in next, list do
                cleaned[k] = v
            end
        else
            report("using replacements from %a",fullname)
            cleaned = list
        end
        cleaner = true
    end

    function loaders.bib(dataset,filename,kind)
        local dataset, fullname = resolvedname(dataset,filename)
        if not fullname then
            return
        end
        local data = io.loaddata(filename) or ""
        if data == "" then
            report("empty file %a, nothing loaded",fullname)
            return
        end
        if cleaner == true then
            cleaner = Cs((lpeg.utfchartabletopattern(keys(cleaned)) / cleaned + p_utf8character)^1)
        end
        if cleaner ~= false then
            data = lpegmatch(cleaner,data)
        end
        if trace then
            report("loading file %a",fullname)
        end
        publications.loadbibdata(dataset,data,fullname,kind)
    end

    function loaders.lua(dataset,filename) -- if filename is a table we load that one
        local current, data, fullname
        if type(filename) == "table" then
            current = datasets[dataset]
            data    = filename
        else
            dataset, fullname = resolvedname(dataset,filename)
            if not fullname then
                return
            end
            current = datasets[dataset]
            data    = table.load(filename)
        end
        if data then
            local luadata = current.luadata
            -- we want the same index each run
            for tag, entry in sortedhash(data) do
                if type(entry) == "table" then
                    entry.index  = getindex(current,luadata,tag)
                    entry.tag    = tag
                    luadata[tag] = entry -- no cleaning yet
                end
            end
        end
    end

    function loaders.buffer(dataset,name) -- if filename is a table we load that one
        local current  = datasets[dataset]
        local barename = file.removesuffix(name)
        local data     = buffers.getcontent(barename) or ""
        if data == "" then
            report("empty buffer %a, nothing loaded",barename)
            return
        end
        if trace then
            report("loading buffer",barename)
        end
        publications.loadbibdata(current,data,barename,"bib")
    end

    function loaders.xml(dataset,filename)
        local dataset, fullname = resolvedname(dataset,filename)
        if not fullname then
            return
        end
        local current = datasets[dataset]
        local luadata = current.luadata
        local root    = xml.load(filename)
        for bibentry in xmlcollected(root,"/bibtex/entry") do
            local attributes = bibentry.at
            local tag        = attributes.tag
            local entry      = {
                category = attributes.category,
                tag      = tag, -- afterwards also set, to prevent overload
                index    = 0,   -- prelocated
            }
            for field in xmlcollected(bibentry,"/field") do
                entry[field.at.name] = field.dt[1] -- no cleaning yet | xmltext(field)
            end
            entry.index  = getindex(current,luadata,tag)
            entry.tag    = tag
            luadata[tag] = entry
        end
    end

    setmetatableindex(loaders,function(t,filetype)
        local v = function(dataset,filename)
            report("no loader for file %a with filetype %a",filename,filetype)
        end
        t[filetype] = v
        return v
    end)

    function publications.load(specification)
        local current  = datasets[specification.dataset or v_default]
        local files    = settings_to_array(specification.filename)
        local kind     = specification.kind
        local dataspec = specification.specification
        statistics.starttiming(publications)
        for i=1,#files do
            local filetype, filename = string.splitup(files[i],"::")
            if not filename then
                filename = filetype
                filetype = file.suffix(filename)
            end
            if filename then
                if not filetype or filetype == "" then
                    filetype = "bib"
                end
                if file.suffix(filename) == "" then
                    file.addsuffix(filename,filetype)
                end
                loaders[filetype](current,filename)
                if kind then
                    current.loaded[current.fullname or filename] = kind
                end
                if dataspec then
                    current.specifications[dataspec] = true
                end
            end
        end
        local runner = enhancer.runner
        if runner then
            runner(current)
        end
        statistics.stoptiming(publications)
        return current
    end

end

do

    function enhancers.order(dataset)
        local luadata = dataset.luadata
        local ordered = dataset.ordered
        for i=1,#ordered do
            local tag = ordered[i]
            if type(tag) == "string" then
                ordered[i] = luadata[tag]
            end
        end
    end

    function enhancers.details(dataset)
        local luadata = dataset.luadata
        local details = dataset.details
        for tag, entry in next, luadata do
            if not details[tag] then
                details[tag] = { }
            end
        end
    end

    utilities.sequencers.appendaction(enhancer,"system","publications.enhancers.order")
    utilities.sequencers.appendaction(enhancer,"system","publications.enhancers.details")

end

do

    local checked  = function(s,d) d[s] = (d[s] or 0) + 1 end
    local checktex = ( (1-P("\\"))^1 + P("\\") * ((C(R("az","AZ")^1)  * Carg(1))/checked))^0

    function publications.analyze(dataset)
        local current    = datasets[dataset]
        local data       = current.luadata
        local categories = { }
        local fields     = { }
        local commands   = { }
        for k, v in next, data do
            categories[v.category] = (categories[v.category] or 0) + 1
            for k, v in next, v do
                fields[k] = (fields[k] or 0) + 1
                lpegmatch(checktex,v,1,commands)
            end
        end
        current.analysis = {
            categories = categories,
            fields     = fields,
            commands   = commands,
        }
    end

end

function publications.tags(dataset)
    return sortedkeys(datasets[dataset].luadata)
end

function publications.sortedentries(dataset)
    return sortedhash(datasets[dataset].luadata)
end

-- a helper:

function publications.concatstate(i,n)
    if i == 0 then
        return 0
    elseif i == 1 then
        return 1
    elseif i == 2 and n == 2 then
        return 4
    elseif i == n then
        return 3
    else
        return 2
    end
end

-- savers

do

    local savers = { }

    local s_preamble = [[
% this is an export from context mkiv

@preamble{
    \ifdefined\btxcmd
        % we're probably in context
    \else
        \def\btxcmd#1{\csname#1\endcsname}
    \fi
}

]]

    function savers.bib(dataset,filename,tobesaved)
        local f_start = formatters["@%s{%s,\n"]
        local f_field = formatters["  %s = {%s},\n"]
        local s_stop  = "}\n\n"
        local result  = { s_preamble }
        local n, r = 0, 1
        for tag, data in sortedhash(tobesaved) do
            r = r + 1 ; result[r] = f_start(data.category or "article",tag)
            for key, value in sortedhash(data) do
                if not privates[key] then
                    r = r + 1 ; result[r] = f_field(key,value)
                end
            end
            r = r + 1 ; result[r] = s_stop
            n = n + 1
        end
        report("%s entries from dataset %a saved in %a",n,dataset,filename)
        io.savedata(filename,concat(result))
    end

    function savers.lua(dataset,filename,tobesaved)
        local list = { }
        local n = 0
        for tag, data in next, tobesaved do
            local t = { }
            for key, value in next, data do
                if not privates[key] then
                    d[key] = value
                end
            end
            list[tag] = t
            n = n + 1
        end
        report("%s entries from dataset %a saved in %a",n,dataset,filename)
        table.save(filename,list)
    end

    function savers.xml(dataset,filename,tobesaved)
        local result, n = publications.converttoxml(dataset,true,true,false,tobesaved)
        report("%s entries from dataset %a saved in %a",n,dataset,filename)
        io.savedata(filename,result)
    end

    function publications.save(specification)
        local dataset   = specification.dataset
        local filename  = specification.filename
        local filetype  = specification.filetype
        local criterium = specification.criterium
        statistics.starttiming(publications)
        if not filename or filename == "" then
            report("no filename for saving given")
            return
        end
        if not filetype or filetype == "" then
            filetype = file.suffix(filename)
        end
        if not criterium or criterium == "" then
            criterium = v_all
        end
        local saver = savers[filetype]
        if saver then
            local current   = datasets[dataset]
            local luadata   = current.luadata or { }
            local tobesaved = { }
            local result  = structures.lists.filter({criterium = criterium, names = "btx"}) or { }
            for i=1,#result do
                local userdata = result[i].userdata
                if userdata then
                    local set = userdata.btxset or v_default
                    if set == dataset then
                        local tag = userdata.btxref
                        if tag then
                            tobesaved[tag] = luadata[tag]
                        end
                    end
                end
            end
            saver(dataset,filename,tobesaved)
        else
            report("unknown format %a for saving %a",filetype,dataset)
        end
        statistics.stoptiming(publications)
        return dataset
    end

    implement {
        name      = "btxsavedataset",
        actions   = publications.save,
        arguments = {
            {
                { "dataset" },
                { "filename" },
                { "filetype" },
                { "criterium" },
            }
        }
    }

end

-- casters

do

    publications.detailed = setmetatableindex(function(detailed,kind)
        local values = setmetatableindex(function(values,value)
            local caster = casters[kind]
            local cast   = caster and caster(value) or value
            values[value] = cast
            return cast
        end)
        detailed[kind] = values
        return values
    end)

    local keywordsplitter = utilities.parsers.groupedsplitat(";,")

    casters.keyword = function(str)
        return lpegmatch(keywordsplitter,str)
    end


    writers.keyword = function(k)
        if type(k) == "table" then
            return concat(p,";")
        else
            return k
        end
    end

    local pagessplitter = lpeg.splitat(P("-")^1)

    casters.range = function(str)
        local first, last = lpegmatch(pagessplitter,str)
        return first and last and { first, last } or str
    end

    writers.range = function(p)
        if type(p) == "table" then
            return concat(p,"-")
        else
            return p
        end
    end

    casters.pagenumber = casters.range
    writers.pagenumber = writers.range

end