summaryrefslogtreecommitdiff
path: root/src/fontloader/misc/fontloader-l-table.lua
blob: 498f518333f262634005b9e4337dca451fdfbd30 (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
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
if not modules then modules = { } end modules ['l-table'] = {
    version   = 1.001,
    comment   = "companion to luat-lib.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

local type, next, tostring, tonumber, ipairs, select = type, next, tostring, tonumber, ipairs, select
local table, string = table, string
local concat, sort, insert, remove = table.concat, table.sort, table.insert, table.remove
local format, lower, dump = string.format, string.lower, string.dump
local getmetatable, setmetatable = getmetatable, setmetatable
local getinfo = debug.getinfo
local lpegmatch, patterns = lpeg.match, lpeg.patterns
local floor = math.floor

-- extra functions, some might go (when not used)
--
-- we could serialize using %a but that won't work well is in the code we mostly use
-- floats and as such we get unequality e.g. in version comparisons

local stripper = patterns.stripper

function table.strip(tab)
    local lst, l = { }, 0
    for i=1,#tab do
        local s = lpegmatch(stripper,tab[i]) or ""
        if s == "" then
            -- skip this one
        else
            l = l + 1
            lst[l] = s
        end
    end
    return lst
end

function table.keys(t)
    if t then
        local keys, k = { }, 0
        for key in next, t do
            k = k + 1
            keys[k] = key
        end
        return keys
    else
        return { }
    end
end

-- local function compare(a,b)
--     local ta = type(a) -- needed, else 11 < 2
--     local tb = type(b) -- needed, else 11 < 2
--     if ta == tb and ta == "number" then
--         return a < b
--     else
--         return tostring(a) < tostring(b) -- not that efficient
--     end
-- end

-- local function compare(a,b)
--     local ta = type(a) -- needed, else 11 < 2
--     local tb = type(b) -- needed, else 11 < 2
--     if ta == tb and (ta == "number" or ta == "string") then
--         return a < b
--     else
--         return tostring(a) < tostring(b) -- not that efficient
--     end
-- end

-- local function sortedkeys(tab)
--     if tab then
--         local srt, category, s = { }, 0, 0 -- 0=unknown 1=string, 2=number 3=mixed
--         for key in next, tab do
--             s = s + 1
--             srt[s] = key
--             if category == 3 then
--                 -- no further check
--             else
--                 local tkey = type(key)
--                 if tkey == "string" then
--                     category = (category == 2 and 3) or 1
--                 elseif tkey == "number" then
--                     category = (category == 1 and 3) or 2
--                 else
--                     category = 3
--                 end
--             end
--         end
--         if category == 0 or category == 3 then
--             sort(srt,compare)
--         else
--             sort(srt)
--         end
--         return srt
--     else
--         return { }
--     end
-- end

-- local function compare(a,b)
--     local ta = type(a) -- needed, else 11 < 2
--     local tb = type(b) -- needed, else 11 < 2
--     if ta == tb and (ta == "number" or ta == "string") then
--         return a < b
--     else
--         return tostring(a) < tostring(b) -- not that efficient
--     end
-- end

-- local function compare(a,b)
--     local ta = type(a) -- needed, else 11 < 2
--     if ta == "number" or ta == "string" then
--         local tb = type(b) -- needed, else 11 < 2
--         if ta == tb then
--             return a < b
--         end
--     end
--     return tostring(a) < tostring(b) -- not that efficient
-- end

local function compare(a,b)
    local ta = type(a) -- needed, else 11 < 2
    if ta == "number" then
        local tb = type(b) -- needed, else 11 < 2
        if ta == tb then
            return a < b
        elseif tb == "string" then
            return tostring(a) < b
        end
    elseif ta == "string" then
        local tb = type(b) -- needed, else 11 < 2
        if ta == tb then
            return a < b
        else
            return a < tostring(b)
        end
    end
    return tostring(a) < tostring(b) -- not that efficient
end

local function sortedkeys(tab)
    if tab then
        local srt, category, s = { }, 0, 0 -- 0=unknown 1=string, 2=number 3=mixed
        for key in next, tab do
            s = s + 1
            srt[s] = key
            if category == 3 then
                -- no further check
            elseif category == 1 then
                if type(key) ~= "string" then
                    category = 3
                end
            elseif category == 2 then
                if type(key) ~= "number" then
                    category = 3
                end
            else
                local tkey = type(key)
                if tkey == "string" then
                    category = 1
                elseif tkey == "number" then
                    category = 2
                else
                    category = 3
                end
            end
        end
        if s < 2 then
            -- nothing to sort
        elseif category == 3 then
            sort(srt,compare)
        else
            sort(srt)
        end
        return srt
    else
        return { }
    end
end

local function sortedhashonly(tab)
    if tab then
        local srt, s = { }, 0
        for key in next, tab do
            if type(key) == "string" then
                s = s + 1
                srt[s] = key
            end
        end
        if s > 1 then
            sort(srt)
        end
        return srt
    else
        return { }
    end
end

local function sortedindexonly(tab)
    if tab then
        local srt, s = { }, 0
        for key in next, tab do
            if type(key) == "number" then
                s = s + 1
                srt[s] = key
            end
        end
        if s > 1 then
            sort(srt)
        end
        return srt
    else
        return { }
    end
end

local function sortedhashkeys(tab,cmp) -- fast one
    if tab then
        local srt, s = { }, 0
        for key in next, tab do
            if key then
                s= s + 1
                srt[s] = key
            end
        end
        if s > 1 then
            sort(srt,cmp)
        end
        return srt
    else
        return { }
    end
end

function table.allkeys(t)
    local keys = { }
    for k, v in next, t do
        for k in next, v do
            keys[k] = true
        end
    end
    return sortedkeys(keys)
end

table.sortedkeys      = sortedkeys
table.sortedhashonly  = sortedhashonly
table.sortedindexonly = sortedindexonly
table.sortedhashkeys  = sortedhashkeys

local function nothing() end

local function sortedhash(t,cmp)
    if t then
        local s
        if cmp then
            -- it would be nice if the sort function would accept a third argument (or nicer, an optional first)
            s = sortedhashkeys(t,function(a,b) return cmp(t,a,b) end)
        else
            s = sortedkeys(t) -- the robust one
        end
        local m = #s
        if m == 1 then
            return next, t
        elseif m > 0 then
            local n = 0
            return function()
                if n < m then
                    n = n + 1
                    local k = s[n]
                    return k, t[k]
                end
            end
        end
    end
    return nothing
end

table.sortedhash  = sortedhash
table.sortedpairs = sortedhash -- obsolete

function table.append(t,list)
    local n = #t
    for i=1,#list do
        n = n + 1
        t[n] = list[i]
    end
    return t
end

function table.prepend(t, list)
    local nl = #list
    local nt = nl + #t
    for i=#t,1,-1 do
        t[nt] = t[i]
        nt = nt - 1
    end
    for i=1,#list do
        t[i] = list[i]
    end
    return t
end

-- function table.merge(t, ...) -- first one is target
--     t = t or { }
--     local lst = { ... }
--     for i=1,#lst do
--         for k, v in next, lst[i] do
--             t[k] = v
--         end
--     end
--     return t
-- end

function table.merge(t, ...) -- first one is target
    t = t or { }
    for i=1,select("#",...) do
        for k, v in next, (select(i,...)) do
            t[k] = v
        end
    end
    return t
end

-- function table.merged(...)
--     local tmp, lst = { }, { ... }
--     for i=1,#lst do
--         for k, v in next, lst[i] do
--             tmp[k] = v
--         end
--     end
--     return tmp
-- end

function table.merged(...)
    local t = { }
    for i=1,select("#",...) do
        for k, v in next, (select(i,...)) do
            t[k] = v
        end
    end
    return t
end

-- function table.imerge(t, ...)
--     local lst, nt = { ... }, #t
--     for i=1,#lst do
--         local nst = lst[i]
--         for j=1,#nst do
--             nt = nt + 1
--             t[nt] = nst[j]
--         end
--     end
--     return t
-- end

function table.imerge(t, ...)
    local nt = #t
    for i=1,select("#",...) do
        local nst = select(i,...)
        for j=1,#nst do
            nt = nt + 1
            t[nt] = nst[j]
        end
    end
    return t
end

-- function table.imerged(...)
--     local tmp, ntmp, lst = { }, 0, {...}
--     for i=1,#lst do
--         local nst = lst[i]
--         for j=1,#nst do
--             ntmp = ntmp + 1
--             tmp[ntmp] = nst[j]
--         end
--     end
--     return tmp
-- end

function table.imerged(...)
    local tmp, ntmp = { }, 0
    for i=1,select("#",...) do
        local nst = select(i,...)
        for j=1,#nst do
            ntmp = ntmp + 1
            tmp[ntmp] = nst[j]
        end
    end
    return tmp
end

local function fastcopy(old,metatabletoo) -- fast one
    if old then
        local new = { }
        for k, v in next, old do
            if type(v) == "table" then
                new[k] = fastcopy(v,metatabletoo) -- was just table.copy
            else
                new[k] = v
            end
        end
        if metatabletoo then
            -- optional second arg
            local mt = getmetatable(old)
            if mt then
                setmetatable(new,mt)
            end
        end
        return new
    else
        return { }
    end
end

-- todo : copy without metatable

local function copy(t, tables) -- taken from lua wiki, slightly adapted
    tables = tables or { }
    local tcopy = { }
    if not tables[t] then
        tables[t] = tcopy
    end
    for i,v in next, t do -- brrr, what happens with sparse indexed
        if type(i) == "table" then
            if tables[i] then
                i = tables[i]
            else
                i = copy(i, tables)
            end
        end
        if type(v) ~= "table" then
            tcopy[i] = v
        elseif tables[v] then
            tcopy[i] = tables[v]
        else
            tcopy[i] = copy(v, tables)
        end
    end
    local mt = getmetatable(t)
    if mt then
        setmetatable(tcopy,mt)
    end
    return tcopy
end

table.fastcopy = fastcopy
table.copy     = copy

function table.derive(parent) -- for the moment not public
    local child = { }
    if parent then
        setmetatable(child,{ __index = parent })
    end
    return child
end

function table.tohash(t,value)
    local h = { }
    if t then
        if value == nil then value = true end
        for _, v in next, t do -- no ipairs here
            h[v] = value
        end
    end
    return h
end

function table.fromhash(t)
    local hsh, h = { }, 0
    for k, v in next, t do -- no ipairs here
        if v then
            h = h + 1
            hsh[h] = k
        end
    end
    return hsh
end

local noquotes, hexify, handle, compact, inline, functions, metacheck

local reserved = table.tohash { -- intercept a language inconvenience: no reserved words as key
    'and', 'break', 'do', 'else', 'elseif', 'end', 'false', 'for', 'function', 'if',
    'in', 'local', 'nil', 'not', 'or', 'repeat', 'return', 'then', 'true', 'until', 'while',
    'NaN', 'goto',
}

-- local function simple_table(t)
--     if #t > 0 then
--         local n = 0
--         for _,v in next, t do
--             n = n + 1
--         end
--         if n == #t then
--             local tt, nt = { }, 0
--             for i=1,#t do
--                 local v = t[i]
--                 local tv = type(v)
--                 if tv == "number" then
--                     nt = nt + 1
--                     if hexify then
--                         tt[nt] = format("0x%X",v)
--                     else
--                         tt[nt] = tostring(v) -- tostring not needed
--                     end
--                 elseif tv == "string" then
--                     nt = nt + 1
--                     tt[nt] = format("%q",v)
--                 elseif tv == "boolean" then
--                     nt = nt + 1
--                     tt[nt] = v and "true" or "false"
--                 else
--                     return nil
--                 end
--             end
--             return tt
--         end
--     end
--     return nil
-- end

local function simple_table(t)
    local nt = #t
    if nt > 0 then
        local n = 0
        for _,v in next, t do
            n = n + 1
         -- if type(v) == "table" then
         --     return nil
         -- end
        end
        if n == nt then
            local tt = { }
            for i=1,nt do
                local v = t[i]
                local tv = type(v)
                if tv == "number" then
                    if hexify then
                        tt[i] = format("0x%X",v)
                    else
                        tt[i] = tostring(v) -- tostring not needed
                    end
                elseif tv == "string" then
                    tt[i] = format("%q",v)
                elseif tv == "boolean" then
                    tt[i] = v and "true" or "false"
                else
                    return nil
                end
            end
            return tt
        end
    end
    return nil
end

-- Because this is a core function of mkiv I moved some function calls
-- inline.
--
-- twice as fast in a test:
--
-- local propername = lpeg.P(lpeg.R("AZ","az","__") * lpeg.R("09","AZ","az", "__")^0 * lpeg.P(-1) )

-- problem: there no good number_to_string converter with the best resolution

-- probably using .. is faster than format
-- maybe split in a few cases (yes/no hexify)

-- todo: %g faster on numbers than %s

-- we can speed this up with repeaters and formatters but we haven't defined them
-- yet

local propername = patterns.propername -- was find(name,"^%a[%w%_]*$")

local function dummy() end

local function do_serialize(root,name,depth,level,indexed)
    if level > 0 then
        depth = depth .. " "
        if indexed then
            handle(format("%s{",depth))
        else
            local tn = type(name)
            if tn == "number" then
                if hexify then
                    handle(format("%s[0x%X]={",depth,name))
                else
                    handle(format("%s[%s]={",depth,name))
                end
            elseif tn == "string" then
                if noquotes and not reserved[name] and lpegmatch(propername,name) then
                    handle(format("%s%s={",depth,name))
                else
                    handle(format("%s[%q]={",depth,name))
                end
            elseif tn == "boolean" then
                handle(format("%s[%s]={",depth,name and "true" or "false"))
            else
                handle(format("%s{",depth))
            end
        end
    end
    -- we could check for k (index) being number (cardinal)
    if root and next(root) ~= nil then
        local first, last = nil, 0
        if compact then
            last = #root
            for k=1,last do
             -- if root[k] == nil then
                if rawget(root,k) == nil then
                    last = k - 1
                    break
                end
            end
            if last > 0 then
                first = 1
            end
        end
        local sk = sortedkeys(root)
        for i=1,#sk do
            local k  = sk[i]
            local v  = root[k]
            local tv = type(v)
            local tk = type(k)
            if compact and first and tk == "number" and k >= first and k <= last then
                if tv == "number" then
                    if hexify then
                        handle(format("%s 0x%X,",depth,v))
                    else
                        handle(format("%s %s,",depth,v)) -- %.99g
                    end
                elseif tv == "string" then
                    handle(format("%s %q,",depth,v))
                elseif tv == "table" then
                    if next(v) == nil then
                        handle(format("%s {},",depth))
                    elseif inline then -- and #t > 0
                        local st = simple_table(v)
                        if st then
                            handle(format("%s { %s },",depth,concat(st,", ")))
                        else
                            do_serialize(v,k,depth,level+1,true)
                        end
                    else
                        do_serialize(v,k,depth,level+1,true)
                    end
                elseif tv == "boolean" then
                    handle(format("%s %s,",depth,v and "true" or "false"))
                elseif tv == "function" then
                    if functions then
                        handle(format('%s load(%q),',depth,dump(v))) -- maybe strip
                    else
                        handle(format('%s "function",',depth))
                    end
                else
                    handle(format("%s %q,",depth,tostring(v)))
                end
            elseif k == "__p__" then -- parent
                if false then
                    handle(format("%s __p__=nil,",depth))
                end
            elseif tv == "number" then
                if tk == "number" then
                    if hexify then
                        handle(format("%s [0x%X]=0x%X,",depth,k,v))
                    else
                        handle(format("%s [%s]=%s,",depth,k,v)) -- %.99g
                    end
                elseif tk == "boolean" then
                    if hexify then
                        handle(format("%s [%s]=0x%X,",depth,k and "true" or "false",v))
                    else
                        handle(format("%s [%s]=%s,",depth,k and "true" or "false",v)) -- %.99g
                    end
                elseif tk ~= "string" then
                    -- ignore
                elseif noquotes and not reserved[k] and lpegmatch(propername,k) then
                    if hexify then
                        handle(format("%s %s=0x%X,",depth,k,v))
                    else
                        handle(format("%s %s=%s,",depth,k,v)) -- %.99g
                    end
                else
                    if hexify then
                        handle(format("%s [%q]=0x%X,",depth,k,v))
                    else
                        handle(format("%s [%q]=%s,",depth,k,v)) -- %.99g
                    end
                end
            elseif tv == "string" then
                if tk == "number" then
                    if hexify then
                        handle(format("%s [0x%X]=%q,",depth,k,v))
                    else
                        handle(format("%s [%s]=%q,",depth,k,v))
                    end
                elseif tk == "boolean" then
                    handle(format("%s [%s]=%q,",depth,k and "true" or "false",v))
                elseif tk ~= "string" then
                    -- ignore
                elseif noquotes and not reserved[k] and lpegmatch(propername,k) then
                    handle(format("%s %s=%q,",depth,k,v))
                else
                    handle(format("%s [%q]=%q,",depth,k,v))
                end
            elseif tv == "table" then
                if next(v) == nil then
                    if tk == "number" then
                        if hexify then
                            handle(format("%s [0x%X]={},",depth,k))
                        else
                            handle(format("%s [%s]={},",depth,k))
                        end
                    elseif tk == "boolean" then
                        handle(format("%s [%s]={},",depth,k and "true" or "false"))
                    elseif tk ~= "string" then
                        -- ignore
                    elseif noquotes and not reserved[k] and lpegmatch(propername,k) then
                        handle(format("%s %s={},",depth,k))
                    else
                        handle(format("%s [%q]={},",depth,k))
                    end
                elseif inline then
                    local st = simple_table(v)
                    if st then
                        if tk == "number" then
                            if hexify then
                                handle(format("%s [0x%X]={ %s },",depth,k,concat(st,", ")))
                            else
                                handle(format("%s [%s]={ %s },",depth,k,concat(st,", ")))
                            end
                        elseif tk == "boolean" then
                            handle(format("%s [%s]={ %s },",depth,k and "true" or "false",concat(st,", ")))
                        elseif tk ~= "string" then
                            -- ignore
                        elseif noquotes and not reserved[k] and lpegmatch(propername,k) then
                            handle(format("%s %s={ %s },",depth,k,concat(st,", ")))
                        else
                            handle(format("%s [%q]={ %s },",depth,k,concat(st,", ")))
                        end
                    else
                        do_serialize(v,k,depth,level+1)
                    end
                else
                    do_serialize(v,k,depth,level+1)
                end
            elseif tv == "boolean" then
                if tk == "number" then
                    if hexify then
                        handle(format("%s [0x%X]=%s,",depth,k,v and "true" or "false"))
                    else
                        handle(format("%s [%s]=%s,",depth,k,v and "true" or "false"))
                    end
                elseif tk == "boolean" then
                    handle(format("%s [%s]=%s,",depth,tostring(k),v and "true" or "false"))
                elseif tk ~= "string" then
                    -- ignore
                elseif noquotes and not reserved[k] and lpegmatch(propername,k) then
                    handle(format("%s %s=%s,",depth,k,v and "true" or "false"))
                else
                    handle(format("%s [%q]=%s,",depth,k,v and "true" or "false"))
                end
            elseif tv == "function" then
                if functions then
                    local f = getinfo(v).what == "C" and dump(dummy) or dump(v) -- maybe strip
                 -- local f = getinfo(v).what == "C" and dump(function(...) return v(...) end) or dump(v) -- maybe strip
                    if tk == "number" then
                        if hexify then
                            handle(format("%s [0x%X]=load(%q),",depth,k,f))
                        else
                            handle(format("%s [%s]=load(%q),",depth,k,f))
                        end
                    elseif tk == "boolean" then
                        handle(format("%s [%s]=load(%q),",depth,k and "true" or "false",f))
                    elseif tk ~= "string" then
                        -- ignore
                    elseif noquotes and not reserved[k] and lpegmatch(propername,k) then
                        handle(format("%s %s=load(%q),",depth,k,f))
                    else
                        handle(format("%s [%q]=load(%q),",depth,k,f))
                    end
                end
            else
                if tk == "number" then
                    if hexify then
                        handle(format("%s [0x%X]=%q,",depth,k,tostring(v)))
                    else
                        handle(format("%s [%s]=%q,",depth,k,tostring(v)))
                    end
                elseif tk == "boolean" then
                    handle(format("%s [%s]=%q,",depth,k and "true" or "false",tostring(v)))
                elseif tk ~= "string" then
                    -- ignore
                elseif noquotes and not reserved[k] and lpegmatch(propername,k) then
                    handle(format("%s %s=%q,",depth,k,tostring(v)))
                else
                    handle(format("%s [%q]=%q,",depth,k,tostring(v)))
                end
            end
        end
    end
    if level > 0 then
        handle(format("%s},",depth))
    end
end

-- replacing handle by a direct t[#t+1] = ... (plus test) is not much
-- faster (0.03 on 1.00 for zapfino.tma)

local function serialize(_handle,root,name,specification) -- handle wins
    local tname = type(name)
    if type(specification) == "table" then
        noquotes  = specification.noquotes
        hexify    = specification.hexify
        handle    = _handle or specification.handle or print
        functions = specification.functions
        compact   = specification.compact
        inline    = specification.inline and compact
        metacheck = specification.metacheck
        if functions == nil then
            functions = true
        end
        if compact == nil then
            compact = true
        end
        if inline == nil then
            inline = compact
        end
        if metacheck == nil then
            metacheck = true
        end
    else
        noquotes  = false
        hexify    = false
        handle    = _handle or print
        compact   = true
        inline    = true
        functions = true
        metacheck = true
    end
    if tname == "string" then
        if name == "return" then
            handle("return {")
        else
            handle(name .. "={")
        end
    elseif tname == "number" then
        if hexify then
            handle(format("[0x%X]={",name))
        else
            handle("[" .. name .. "]={")
        end
    elseif tname == "boolean" then
        if name then
            handle("return {")
        else
            handle("{")
        end
    else
        handle("t={")
    end
    if root then
        -- The dummy access will initialize a table that has a delayed initialization
        -- using a metatable. (maybe explicitly test for metatable). This can crash on
        -- metatables that check the index against a number.
        if metacheck and getmetatable(root) then
            local dummy = root._w_h_a_t_e_v_e_r_
            root._w_h_a_t_e_v_e_r_ = nil
        end
        -- Let's forget about empty tables.
        if next(root) ~= nil then
            do_serialize(root,name,"",0)
        end
    end
    handle("}")
end

-- A version with formatters is some 20% faster than using format (because formatters are
-- much faster) but of course, inlining the format using .. is then again faster .. anyway,
-- as we do some pretty printing as well there is not that much to gain unless we make a
-- 'fast' ugly variant as well. But, we would have to move the formatter to l-string then.

-- name:
--
-- true     : return     { }
-- false    :            { }
-- nil      : t        = { }
-- string   : string   = { }
-- "return" : return     { }
-- number   : [number] = { }

function table.serialize(root,name,specification)
    local t, n = { }, 0
    local function flush(s)
        n = n + 1
        t[n] = s
    end
    serialize(flush,root,name,specification)
    return concat(t,"\n")
end

--   local a = { e = { 1,2,3,4,5,6}, a = 1, b = 2, c = "ccc", d = { a = 1, b = 2, c = "ccc", d = { a = 1, b = 2, c = "ccc" } } }
--   local t = os.clock()
--   for i=1,10000 do
--       table.serialize(a)
--   end
--   print(os.clock()-t,table.serialize(a))

table.tohandle = serialize

local maxtab = 2*1024

function table.tofile(filename,root,name,specification)
    local f = io.open(filename,'w')
    if f then
        if maxtab > 1 then
            local t, n = { }, 0
            local function flush(s)
                n = n + 1
                t[n] = s
                if n > maxtab then
                    f:write(concat(t,"\n"),"\n") -- hm, write(sometable) should be nice
                    t, n = { }, 0 -- we could recycle t if needed
                end
            end
            serialize(flush,root,name,specification)
            f:write(concat(t,"\n"),"\n")
        else
            local function flush(s)
                f:write(s,"\n")
            end
            serialize(flush,root,name,specification)
        end
        f:close()
        io.flush()
    end
end

local function flattened(t,f,depth) -- also handles { nil, 1, nil, 2 }
    if f == nil then
        f = { }
        depth = 0xFFFF
    elseif tonumber(f) then
        -- assume that only two arguments are given
        depth = f
        f = { }
    elseif not depth then
        depth = 0xFFFF
    end
    for k, v in next, t do
        if type(k) ~= "number" then
            if depth > 0 and type(v) == "table" then
                flattened(v,f,depth-1)
            else
                f[#f+1] = v
            end
        end
    end
    for k=1,#t do
        local v = t[k]
        if depth > 0 and type(v) == "table" then
            flattened(v,f,depth-1)
        else
            f[#f+1] = v
        end
    end
    return f
end

table.flattened = flattened

local function unnest(t,f) -- only used in mk, for old times sake
    if not f then          -- and only relevant for token lists
        f = { }            -- this one can become obsolete
    end
    for i=1,#t do
        local v = t[i]
        if type(v) == "table" then
            if type(v[1]) == "table" then
                unnest(v,f)
            else
                f[#f+1] = v
            end
        else
            f[#f+1] = v
        end
    end
    return f
end

function table.unnest(t) -- bad name
    return unnest(t)
end

local function are_equal(a,b,n,m) -- indexed
    if a and b and #a == #b then
        n = n or 1
        m = m or #a
        for i=n,m do
            local ai, bi = a[i], b[i]
            if ai==bi then
                -- same
            elseif type(ai) == "table" and type(bi) == "table" then
                if not are_equal(ai,bi) then
                    return false
                end
            else
                return false
            end
        end
        return true
    else
        return false
    end
end

local function identical(a,b) -- assumes same structure
    for ka, va in next, a do
        local vb = b[ka]
        if va == vb then
            -- same
        elseif type(va) == "table" and  type(vb) == "table" then
            if not identical(va,vb) then
                return false
            end
        else
            return false
        end
    end
    return true
end

table.identical = identical
table.are_equal = are_equal

local function sparse(old,nest,keeptables)
    local new  = { }
    for k, v in next, old do
        if not (v == "" or v == false) then
            if nest and type(v) == "table" then
                v = sparse(v,nest)
                if keeptables or next(v) ~= nil then
                    new[k] = v
                end
            else
                new[k] = v
            end
        end
    end
    return new
end

table.sparse = sparse

function table.compact(t)
    return sparse(t,true,true)
end

function table.contains(t, v)
    if t then
        for i=1, #t do
            if t[i] == v then
                return i
            end
        end
    end
    return false
end

function table.count(t)
    local n = 0
    for k, v in next, t do
        n = n + 1
    end
    return n
end

function table.swapped(t,s) -- hash
    local n = { }
    if s then
        for k, v in next, s do
            n[k] = v
        end
    end
    for k, v in next, t do
        n[v] = k
    end
    return n
end

function table.mirrored(t) -- hash
    local n = { }
    for k, v in next, t do
        n[v] = k
        n[k] = v
    end
    return n
end

function table.reversed(t)
    if t then
        local tt, tn = { }, #t
        if tn > 0 then
            local ttn = 0
            for i=tn,1,-1 do
                ttn = ttn + 1
                tt[ttn] = t[i]
            end
        end
        return tt
    end
end

function table.reverse(t)
    if t then
        local n = #t
        for i=1,floor(n/2) do
            local j = n - i + 1
            t[i], t[j] = t[j], t[i]
        end
        return t
    end
end

function table.sequenced(t,sep,simple) -- hash only
    if not t then
        return ""
    end
    local n = #t
    local s = { }
    if n > 0 then
        -- indexed
        for i=1,n do
            s[i] = tostring(t[i])
        end
    else
        -- hashed
        n = 0
        for k, v in sortedhash(t) do
            if simple then
                if v == true then
                    n = n + 1
                    s[n] = k
                elseif v and v~= "" then
                    n = n + 1
                    s[n] = k .. "=" .. tostring(v)
                end
            else
                n = n + 1
                s[n] = k .. "=" .. tostring(v)
            end
        end
    end
    return concat(s,sep or " | ")
end

function table.print(t,...)
    if type(t) ~= "table" then
        print(tostring(t))
    else
        serialize(print,t,...)
    end
end

if setinspector then
    setinspector("table",function(v) if type(v) == "table" then serialize(print,v,"table") return true end end)
end

-- -- -- obsolete but we keep them for a while and might comment them later -- -- --

-- roughly: copy-loop : unpack : sub == 0.9 : 0.4 : 0.45 (so in critical apps, use unpack)

function table.sub(t,i,j)
    return { unpack(t,i,j) }
end

-- slower than #t on indexed tables (#t only returns the size of the numerically indexed slice)

function table.is_empty(t)
    return not t or next(t) == nil
end

function table.has_one_entry(t)
    return t and next(t,next(t)) == nil
end

-- new (rather basic, not indexed and nested)

function table.loweredkeys(t) -- maybe utf
    local l = { }
    for k, v in next, t do
        l[lower(k)] = v
    end
    return l
end

-- new, might move (maybe duplicate)

function table.unique(old)
    local hash = { }
    local new = { }
    local n = 0
    for i=1,#old do
        local oi = old[i]
        if not hash[oi] then
            n = n + 1
            new[n] = oi
            hash[oi] = true
        end
    end
    return new
end

function table.sorted(t,...)
    sort(t,...)
    return t -- still sorts in-place
end

--

function table.values(t,s) -- optional sort flag
    if t then
        local values, keys, v = { }, { }, 0
        for key, value in next, t do
            if not keys[value] then
                v = v + 1
                values[v] = value
                keys[k] = key
            end
        end
        if s then
            sort(values)
        end
        return values
    else
        return { }
    end
end

-- maybe this will move to util-tab.lua

-- for k, v in table.filtered(t,pattern)          do ... end
-- for k, v in table.filtered(t,pattern,true)     do ... end
-- for k, v in table.filtered(t,pattern,true,cmp) do ... end

function table.filtered(t,pattern,sort,cmp)
    if t and type(pattern) == "string" then
        if sort then
            local s
            if cmp then
                -- it would be nice if the sort function would accept a third argument (or nicer, an optional first)
                s = sortedhashkeys(t,function(a,b) return cmp(t,a,b) end)
            else
                s = sortedkeys(t) -- the robust one
            end
            local n = 0
            local m = #s
            local function kv(s)
                while n < m do
                    n = n + 1
                    local k = s[n]
                    if find(k,pattern) then
                        return k, t[k]
                    end
                end
            end
            return kv, s
        else
            local n = next(t)
            local function iterator()
                while n ~= nil do
                    local k = n
                    n = next(t,k)
                    if find(k,pattern) then
                        return k, t[k]
                    end
                end
            end
            return iterator, t
        end
    else
        return nothing
    end
end