summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/plain/pitex/fonts.ptxlua
blob: 391ee9a6766cd196fc7a38fbce650ce1362a4b05 (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
-- *** UTILITY FUNCTIONS ***
local function get_locals (tab)
  local tb = {}
  for lib, keys in pairs(tab) do
    keys = string.explode(keys)
    for _, k in ipairs(keys) do
      tb[k] = _G[lib][k]
    end
  end
  return tb
end

-- str
-- string manipulation
local str = get_locals {string = "explode gsub match format lower upper"}

-- Removes space at the beginning and end and conflates multiple spaces.
function str.trim (s)
  s = str.match(s, "^%s*(.-)%s*$")
  s = str.gsub(s, "%s+", " ")
  return s
end

-- Extracts a pattern from a string, i.e. removes it and returns it.
-- If "full", then the entire pattern is removed, not only the captures.
function str.extract (s, pat, full)
  local cap = str.match(s, pat)
  if cap then
    if full then
      s = str.gsub(s, pat, "")
    else
      s = str.gsub(s, cap, "")
    end
  end
  return cap, s
end
-- /str


-- lp
-- advanced string manipulation
lpeg.locale(lpeg)
local lp = get_locals {lpeg = "match P C S Ct V alnum"}
lp.space = lpeg.space^0
-- /lp


-- tab
-- table manipulation
local tab = get_locals {table = "insert remove sort"}

-- Adds val to tab, creating it if necessary.
function tab.update (tb, val)
  tb = tb or {}
  tab.insert(tb, val)
  return tb
end

-- Adds subtable (empty, or val) to tb at entry key, unless it already exists.
function tab.subtable (tb, key, val)
  tb[key] = tb[key] or val or {}
end

-- Writes a table to an extenal file.
local function write_key (key, ind)
  return ind .. '["' .. key .. '"] = '
end

function tab.write (tb, f, ind)
  for a, b in pairs (tb) do
    if type(a) == "string" then
      a = '"' .. a .. '"'
    end
    a = "[" .. a .. "]"
    if type(b) == "table" then
      f:write(ind, a, " = {")
      tab.write(b, f, ind .. "    ")
      f:write(ind, "},")
    else
      if type(b) == "boolean" then
        b = b and "true" or "false"
      elseif type(b) == "string" then
        b = '"' .. b .. '"'
      end
      f:write(ind, a, " = ", b, ",")
    end
  end
end

-- Returns a full copy of a table. Not copying of metatables necessary for the
-- moment.
function tab.copy (tb)
  local t = {}
  for k, v in pairs (tb) do
    if type(v) == "table" then
      v = tab.copy(v)
    end
    t[k] = v
  end
  return t
end

-- Sorts two tables containing modifiers (Italic, etc.).
function tab.sortmods (a, b)
  local A, B = "", ""
  for _, x in ipairs (a) do
    A = A .. " " .. x
  end
  for _, x in ipairs (b) do
    B = B .. " " .. x
  end
  return A < B
end

-- Turns an array into a hash.
function tab.tohash(tb)
  local t = {}
  for _, k in ipairs(tb) do
    t[k] = true
  end
  return t
end
-- /tab

-- lfs
-- files etc.
local lfs = get_locals {lfs = "dir isdir isfile mkdir", kpse = "expand_var show_path find_file"}

-- Returns anything after the last dot, i.e. an extension.
function lfs.extension (s)
  return str.lower(str.match(s, "%.([^%.]*)$"))
end

local extensions = {
  otf = "opentype",
  ttf = "truetype",
  ttc = "truetype",
}
function lfs.type (s)
  return extensions[lfs.extension(s)]
end

local kpse_extensions = {
  otf = "opentype fonts",
  ttf = "truetype fonts",
  ttc = "truetype fonts",
}
function lfs.kpse (s)
  return kpse_extensions[lfs.extension(s)]
end

-- Returns anything after the last slash, i.e. a pathless file.
function lfs.nopath (f)
  return str.match(f, "[^/]*$")
end

-- Creates a directory; the arguments are the successive subdirectories.
function lfs.ensure_dir (...)
  local arg, path = {...}
  for _, d in ipairs(arg) do
    if path then
      path = path .. "/" .. d
    else
      path = d
    end
    path = str.gsub(path, "//", "/")
    if not lfs.isdir(path) then
      lfs.mkdir(path)
    end
  end
  return path
end

-- Turns "foo/blahblah/../" into "foo/" (such going into and leaving
-- directories happens with kpse). Also puts everything to lowercase.
function lfs.smooth_file (f)
  f = str.gsub(f, "/.-/%.%./", "/")
  f = str.gsub(f, "^%a", str.lower)
  return f
end
-- /lfs


-- wri
-- messages
local wri, write_nl = {}, texio.write_nl

function wri.report (s, ...)
	write_nl(str.format(s, unpack(arg)))
end

function wri.error (s, ...)
  tex.error(str.format(s, unpack(arg)))
end
-- /wri


-- various
-- the last one is, of course, not the least
local io  = get_locals {io = "open lines"}
local os  = get_locals {os = "date"}
local num = get_locals {math = "abs tan rad floor pi", tex = "sp"}
local fl  = get_locals {fontloader = "open close to_table info", font = "read_tfm"}
-- /various


-- *** END OF UTILITY FUNCTIONS ***



--- *** CREATING THE LIBRARY *** ---
local settings
if lfs.find_file"foundry-settings.lua" then
  settings = require"foundry-settings.lua"
else
  settings = {normal = {}, features = {}}
end
local font_families = {}
local normal_names = {}
for _, name in ipairs(settings.normal) do
  normal_names[name] = true
end
local local_path   = lfs.expand_var("$TEXMFLOCAL")
local foundry_path = lfs.ensure_dir (local_path, "tex", "luatex", "foundry")
local library_file = foundry_path .. "/" .. "readable.txt"
--local library_file = "c:/texlive/texmf-local/tex/plain/pitex/readable.txt"
--local library_file = "readable.txt"

-- Analyze a font file and return a name and a table
-- with modifiers.
local function extract_font (file, names)
  local fi, subname
  -- Trying to open a font in ttc, using the names returned by fontloader.info
  if names then
    local name = names.fullname
    if name then
      fi = fl.open (file, name)
    end
    if not fi then
      name = names.fontname
      if name then
        fi = fl.open
      end
      if not fi then
        fl.error("Can't open %s", file)
        return
      end
    end
    subname = name
  else
    fi = fl.open(file)
  end
  -- Getting the most precise information. Not necessarily the best
  -- solution, but since the user can modify the library, it's not so bad.
  local fam, name = fi.names[1].names.preffamilyname or fi.names[1].names.family or fi.familyname, fi.fontname
  local spec = fi.names[1].names.prefmodifiers or fi.names[1].names.subfamily or ""
  local subfam, _spec
  local t = { [0]  = file }
  -- Removing mods like Regular, Book, etc.
  for name in pairs(normal_names) do
    spec = str.gsub(spec, name, "")
  end
  if subname then
    tab.insert(t, "[font = " .. subname .. "]")
  end
  if spec ~= "" then
    spec = str.explode(spec)
    for _, s in ipairs(spec) do
      tab.insert(t, s)
    end
  end
  fl.close(fi)
  return fam, t
end

-- Searches directories for font files, and pass them to
-- extract_font. The fonts are collected in a table.
-- The fonts_done table is updated when the library is read,
-- so when a font is missing and one needs to recheck files,
-- only those that arent in the libraries are considered.
local fonts_done = {}
local function check_fonts (rep, tb)
  for f in lfs.dir (rep) do
    if f ~= "." and f ~= ".." then
      f = str.gsub(rep, "/$", "") .. "/" .. f
      if lfs.isdir(f) then
        check_fonts(f, tb)
      elseif lfs.isfile(f) and not fonts_done[lfs.nopath(f)] then
        local e = lfs.extension(f)
        if e == "ttf" or e == "otf" then
          local fam, file = extract_font(f)
          if fam then
            tab.subtable(tb, fam)
            tab.insert(tb[fam], file)
          end
        elseif e == "ttc" then
          local info = fl.info(f)
          for _, i in ipairs(info) do
            local fam, file = extract_font(f, i)
            if fam then
              tab.subtable(tb, fam)
              tab.insert(tb[fam], file)
            end
          end
        end
      end
    end
  end
end

-- Writes the library to an external file.
-- Type is "a" if what's going on is recheck_fonts.
local function write_lib (fams, file, type)
  local read_table = {}
  for fam, tb in pairs(fams) do
    tab.insert(read_table, fam)
    for _, ttb in ipairs(tb) do
      tab.sort(ttb)
    end
    tab.sort(tb, tab.sortmods)
  end
  tab.sort(read_table)
  local readable = io.open(file, type)
  for n, fam in ipairs(read_table) do
    local log
    if type == "a" then
      log = true
      if n == 1 then
        wri.report("\nAdding new font(s):")
        readable:write("\n\n% Added automatically " .. os.date() .. "\n\n")
      end
      wri.report(fam)
    end
    readable:write(fam .. " :")
    for n, f in ipairs(fams[fam]) do
      log = log and " "
      readable:write("\n ")
      for _, t in ipairs(f) do
        log = log and log .. " " .. t
        readable:write(" " .. t)
      end
      log = log and log .. " " .. '"' .. f[0] .. '"'
      readable:write(" " .. '"' .. lfs.nopath(f[0]) .. '",')
      if log then wri.report(log) end
      if n == #fams[fam] then
        readable:write("\n\n")
      end
    end
  end
  readable:close()
end


-- If there is no library, we create it.
local font_paths = lfs.show_path("opentype fonts")
font_paths = str.gsub(font_paths, "\\", "/")
font_paths = str.gsub(font_paths, "/+", "/")
font_paths = str.gsub(font_paths, "!!", "")
font_paths = str.explode(font_paths, ";+")

if not lfs.find_file(library_file) then
  wri.report("I must create the library; please wait, that can take some time.")
  for _, rep in ipairs(font_paths) do
    check_fonts(rep, font_families)
  end
  write_lib(font_families, library_file, "w")
end

-- Reads the library file, turning it into a table.
local explode_semicolon = lp.P{
  lp.Ct(lp.V"data"^1),
  data = lp.C(((1 - lp.S";[") + (lp.S"[" * (1 - lp.S"]")^0 * lp.S"]" ))^1) / str.trim * (lp.S";" + -1),
  }
local explode_comma = lp.P{
  lp.Ct(lp.V"data"^1),
  data = lp.C(((1 - lp.S",[") + (lp.S"[" * (1 - lp.S"]")^0 * lp.S"]" ))^1) / str.trim * (lp.S"," + -1),
  }

local function load_library (lib)
  local LIB  = ""
  local lib_file = lfs.find_file(lib)
  if not lib_file then
    wri.error("I can't find library %s.", lib)
    return
  end

  for l in io.lines(lib_file) do
    if not str.match(l, "^%s*%%") then
      if str.match(l, "^%s*$") then
        LIB = LIB .. ";"
      else
        LIB = LIB .. " " .. l
      end
    end
  end
  LIB = str.gsub(LIB, ";%s*;", ";;")
  LIB = str.gsub(LIB, ";+", ";")
  LIB = str.gsub(LIB, "^;", "")
  LIB = str.gsub(LIB, "%s+", " ")

  LIB = lp.match(explode_semicolon, LIB)

  local newlib = {}
  for _, t in ipairs(LIB) do
    local fam, files = str.match(t, "(.-):(.*)")
    local current_mods
    if files then
      files = lp.match(explode_comma, files)
      fam = str.explode(fam, ",")
      local root
      for n, f in ipairs (fam) do
        f = str.trim(f)
        if n == 1 then
          root = f
          if type(newlib[f]) == "string" then
            wri.error("Name `%s' is already used as an alias for `%s'; it is now overwritten to denote a family", f, newlib[f])
            newlib[f] = {}
          else
            newlib[f] = newlib[f] or {}
          end
        else
          if newlib[f] then
            wri.error("The name `%s' is already used. I ignore it as an alias for `%s'", f, root)
          else
            newlib[f] = root
          end
        end
      end
      for _, f in ipairs(files) do
        local reset
        reset, f = str.extract(f, "^%.%.", true)
        if reset then current_mods = nil end
        local mods, file, feats = str.match(f, '([^"]*)"(.*)"')
        if mods then
          fonts_done[lfs.nopath(file)] = true
          feats, mods = str.extract(mods, "%[([^%]]-)]", true)
          mods = str.explode(mods)
          if current_mods then
            for _, t in ipairs(current_mods) do
              tab.insert(mods, t)
            end
            if current_mods.feats then
              feats = feats or ""
              feats = current_mods.feats .. "," .. feats
            end
          end
          local sizes, real_mods = {}, {}
          for n, s in ipairs(mods) do
            if tonumber(s) then
              tab.insert(sizes, tonumber(s))
            else
              tab.insert(real_mods, s)
            end
          end
          sizes = #sizes > 0 and sizes or {0}
          tab.sort(real_mods)
          local T = newlib[root]
          for _, t in ipairs(real_mods) do
            t = str.trim(t)
            if t ~= "" then
              T[t] = T[t] or {}
              T = T[t]
            end
          end
          T.__files = T.__files or {}
          for _, s in ipairs(sizes) do
            T.__files[s] = {str.trim(file), feats}
          end
        else
          feats, mods = str.extract(f, "%[([^%]]-)]", true)
          if current_mods then
            for _, mod in ipairs(str.explode(mods)) do
              tab.insert(current_mods, mod)
            end
            if feats then
              current_mods.feats = current_mods.feats and current_mods.feats .. "," .. feats or feats
            end
          else
            current_mods = str.explode(mods)
            current_mods.feats = feats
          end
        end
      end
    end
  end
  return newlib
end

local library = {}
library.default = load_library(library_file)

-- Same as above, but used when rechecking (if a font isn't found in libraries).
local function recheck_fonts ()
  local tb = {}
  for _, rep in ipairs(font_paths) do
    check_fonts(rep, tb)
  end
  write_lib(tb, library_file, "a")
  library.default = load_library(library_file)
end


-- This is public.
function new_library (lib)
  local l = load_library(lib)
  if l then
    tab.insert(library, l)
  end
end

--- *** END OF LIBRARY MANAGEMENT *** ---



--- *** FONT CREATION *** ---


-- Creates a new substitution for trep.
local function add_sub (f, num, sub)
  num, sub = f.map.map[num], f.map.map[sub]
  if f.glyphs[num] and f.glyphs[sub] then
    local x = f.glyphs[num]
    tab.subtable(x, "lookups")
    x.lookups.tex_trep = { { type = "substitution", specification = {variant = f.glyphs[sub].name} } }
  end
end

-- Creates a new ligature for tlig.
local function add_lig (f, lig, ...)
  lig = f.map.map[lig]
  if lig then
    arg = {...}
    local components
    for _, c in ipairs(arg) do
      c = f.map.map[c]
      c = c and f.glyphs[c]
      if c then
        c = c.name
        components = components and components .. " " .. c or c
      else
        components = nil
        break
      end
    end
    if components then
      local x = f.glyphs[lig]
      tab.subtable(x, "lookups")
      tab.subtable(x.lookups, "tex_tlig")
      tab.insert(x.lookups.tex_tlig, { type = "ligature",
        specification = {char = x.name, components = components} })
    end
  end
end

-- Loops over all the constitutents of ligatures, creating intermediary
-- ligatures if necessary. E.g. "f f i" is broken into:
-- f + f = ff.lig
-- ff.lig + i = ffi.lig
-- Then when loading the font if the intermediary ligatures do not exist
-- (e.g. "1/" in "1 / 4") a phantom character is added to the font; which might
-- be dangerous (e.g. "1/" will create a node without character if no "4" follows).
-- The ".lig" suffix is arbitrary but all glyphs marked as ligatures are also registered
-- with such a name, so if there's an "f f" ligature in a font, no matter its name, "ff.lig"
-- will point to it.
local function ligature (comp, tb, phantoms)
  local i = str.gsub(comp[1], "%.lig$", "") .. comp[2] .. ".lig"
  phantoms[i] = true
  tab.insert(tb.all_ligs, i)
  tab.subtable(tb, comp[1])
  tb[comp[1]][comp[2]] = { char = i, type = 0 } -- The type could be something else.
  tab.remove(comp, 1)
  tab.remove(comp, 1)
  if #comp > 0 then
    tab.insert(comp, 1, i)
    ligature(comp, tb, phantoms)
  end
end

local function get_lookups (t, lookup_table)
  if t then
    for _, tb in pairs(t) do
      local _tb = { tags = {} }
      if tb.features then
        for _, feats in pairs(tb.features) do
          local _tag = {}
          if feats.scripts then
            for _, scr in pairs(feats.scripts) do
              _tag[scr.script] = {}
              for _, lang in pairs(scr.langs) do
                tab.insert (_tag[scr.script], str.trim(lang))
              end
            end
          end
          for _, sub in pairs(tb.subtables) do
            tab.insert(_tb, sub.name)
          end
          _tb.tags[feats.tag] = _tag
        end
      end
      if tb.name then
        local tp = tb.type or "no_type"
        tab.subtable(lookup_table, tp)
        lookup_table[tp][tb.name] = _tb
      end
    end
  end
end

function create_font (filename, extension, path, subfont, write)
  
	local data = fl.open(filename, subfont)
	fontfile = fl.to_table(data)
  fl.close(data)

  local lookups = {}

	local name_touni = { }
  local max_char = 0
	for chr, gly in pairs(fontfile.map.map) do
		max_char = chr > max_char and chr or max_char
    -- Some glyphs have the same name in some fonts,
    -- e.g. the several hyphens.
    local name = fontfile.glyphs[gly].name
    while name_touni[name] do
      name = name .. "_"
    end
    name_touni[name] = chr
	end

  if fontfile.gsub then
    tab.insert(fontfile.gsub,
      { type = "gsub_single",
        name = "tex_trep",
        subtables = { {name = "tex_trep"} },
        features = { { tag = "trep"} } })
    tab.insert(fontfile.gsub,
      { type = "gsub_ligature",
        name = "tex_tlig",
        subtables = { {name = "tex_tlig"} },
        features = { { tag = "tlig"} } })
    for _, tb in ipairs(fontfile.gsub) do
      for __, ttb in ipairs(tb.subtables) do
        if tb.type == "gsub_contextchain" then
          lookups[tb.name] = lookups[tb.name] or { type = tb.type }
          tab.insert(lookups[tb.name], ttb.name)
        end
        lookups[ttb.name] = { type = tb.type } 
        lookups["-" .. ttb.name] = { type = tb.type } 
      end
    end
  end

  if fontfile.gpos then
    for _, tb in ipairs(fontfile.gpos) do
      for __, ttb in ipairs(tb.subtables) do
        lookups[ttb.name] = { type = tb.type } 
        lookups["-" .. ttb.name] = { type = tb.type } 
      end
    end
  end

  if fontfile.kerns then
    for _, class in ipairs(fontfile.kerns) do
      local max = 0
      for a in pairs (class.seconds) do
        max = max < a and a or max
      end
      if type(class.lookup) == "string" then
        lookups[class.lookup] = { type = "gpos_pair", firsts = class.firsts, seconds = class.seconds, offsets = class.offsets, max = max}
      else
        for _, lk in ipairs(class.lookup) do
          lookups[lk] = { type = "gpos_pair", firsts = class.firsts, seconds = class.seconds, offsets = class.offsets, max = max}
        end
      end
    end
  end

  add_sub(fontfile, 96, 8216) -- ` to quoteleft
  add_sub(fontfile, 39, 8217) -- ' to apostrophe (quoteright)

  add_lig(fontfile, 8220, 8216, 8216) -- quoteleft + quoteleft to quotedblleft
  add_lig(fontfile, 8221, 8217, 8217) -- quoteright + quoteright to quotedblright
  add_lig(fontfile, 8211, 45, 45)     -- -- to endash
  add_lig(fontfile, 8212, 8211, 45)   -- --- (i.e. endash + -) to emdash
  add_lig(fontfile, 161, 63, 96)      -- ?` to inverted question mark
  add_lig(fontfile, 161, 63, 8216)    -- The same, with `turned to quoteleft.
  add_lig(fontfile, 191, 33, 96)      -- !` to inverted exclamation mark
  add_lig(fontfile, 191, 33, 8216)    -- Idem.

  local characters, phantom_ligatures = {}, {}
  for chr, gly in pairs(fontfile.map.map) do
		local glyph, char = fontfile.glyphs[gly], {}
    
    char.index = gly
    char.name  = glyph.name
    char.width = glyph.width
    if glyph.boundingbox then
			char.depth = -glyph.boundingbox[2]
			char.height = glyph.boundingbox[4] 
		end
    if glyph.italic_correction then
      char.italic = glyph.italic_correction
    elseif glyph.width and glyph.boundingbox then
      char.italic = glyph.boundingbox[3] - glyph.width
    end
    tab.subtable(characters, chr)
    characters[chr] = char

    if glyph.lookups then
      for lk, tb in pairs(glyph.lookups) do
        local _lk = "-" .. lk
        if lookups[lk] and lookups[_lk] then
          for _, l in ipairs(tb) do
            if l.type == "substitution" then
    
              tab.subtable(lookups[lk], "pairs")
              lookups[lk].pairs[glyph.name] = l.specification.variant

              tab.subtable(lookups[_lk], "pairs")
              lookups[_lk].pairs[l.specification.variant] = glyph.name

            elseif l.type == "ligature" then
              
              local comp, lig = str.explode(l.specification.components), l.specification.char
              local lig = ""
              for _, c in ipairs(comp) do
                lig = lig .. c
              end

              tab.subtable(lookups, lk)
              tab.subtable(lookups[lk], "ligs", {all_ligs = {}})
              ligature(comp, lookups[lk].ligs, phantom_ligatures)
              name_touni[lig .. ".lig"] = chr

            end
          end
        end
      end
    end

    if glyph.kerns then
			for _, kern in pairs(glyph.kerns) do
        local lks = type(kern.lookup) == "table" and kern.lookup or {kern.lookup}
        for _, lk in ipairs(lks) do
          tab.subtable(lookups[lk], "kerns")
          tab.subtable(lookups[lk].kerns, glyph.name)
          lookups[lk].kerns[glyph.name][kern.char] = kern.off
        end
			end
		end

  end
  
  for lig in pairs(phantom_ligatures) do
    if not name_touni[lig] then
      max_char = max_char + 1
      name_touni[lig] = max_char
      characters[max_char] = {name = lig}
    end
  end

  local lookup_table = {}
  get_lookups(fontfile.gsub, lookup_table)
	get_lookups(fontfile.gpos, lookup_table)
	get_lookups(fontfile.lookups, lookup_table, true)

  if fontfile.lookups then
    for name, lk in pairs(fontfile.lookups) do
      local tb, format = {}, lk.format
      for _, rule in ipairs(lk.rules) do
        local ttb = { lookups = rule.lookups }
        for pos, seq in pairs(rule[format]) do
          ttb[pos] = {}
          for _, glyfs in ipairs(seq) do
            glyfs = str.explode(glyfs)
            glyfs = tab.tohash(glyfs)
            tab.insert(ttb[pos], glyfs)
          end
        end
        tab.insert(tb, ttb)
      end
      lookups[name] = tb
    end
  end
  
	local loaded_font = {
    
		direction      = 0,
    filename       = filename,
		format         = extension,
		fullname       = fontfile.names[1].names.fullname,
		name           = fontfile.fontname,
		psname         = fontfile.fontname,
		type           = "real",
    units_per_em   = fontfile.units_per_em,

    auto_expand = true,

 		cidinfo = fontfile.cidinfo,

    -- Used only to adjust absoluteslant.
    italicangle         = -fontfile.italicangle,
    name_to_unicode     = name_touni,
    max_char            = max_char,
    lookups             = lookups,
    lookup_table        = lookup_table,
    characters          = characters
	}
  
  if write then
    local f = io.open(path, "w")
    f:write("return {")
    tab.write(loaded_font, f, "\n")
    f:write("}")
    f:close()
  end

  return loaded_font

end

-- GETTING A FONT

-- Finds a font file, and returns the original
-- file and the Lua version.
local name_luafile, get_features
local function is_font (name, mods, size)

  local lib, library_filename
  for l, t in ipairs(library) do
    if t[name] then
      library_filename = t[name]
      lib = t
      break
    end
  end
  if not library_filename then
    library_filename = library.default[name]
    lib = library.default
  end

  if library_filename then
    if type(library_filename) == "string" then
      library_filename = lib[library_filename]
    end
    tab.sort(mods)
    local T = library_filename
    for _, t in ipairs(mods) do
      local found
      for tag in pairs(T) do
        if str.match(tag, "^" .. t) then
          T = T[tag]
          found = true
          break
        end
      end
      if not found then
        T = nil
        break
      end
    end

    if T and T.__files then
      local file, feats
      local diff = 10000
      for s, f in pairs(T.__files) do
        if num.abs(s - size) < diff then
          diff = num.abs(s - size)
          file, feats = f[1], f[2]
        end
      end
      file, _file = lfs.find_file(file, lfs.kpse(file)), file
      if file then
        file = str.gsub(file, "\\", "/")
      else
        return 1, _file
      end
      local features = {}
      if feats then
        get_features(feats, features)
      end
      local lua = name_luafile(file, features.font)
      lua = lfs.isfile(lua) and lua
      return file, lua, feats
    end
  end
end

-- Returns the full path to the Lua version of the font.
-- "sub" is a font in ttc.
function name_luafile (file, sub)
  local lua
  sub = sub and "_" .. sub or ""
  sub = str.gsub(sub, " ", "_")
  if str.match(file, "/") then
    lua = str.match(file, ".*/(.-)%....$")
  else
    lua = str.match(file, "(.-)%....$")
  end
  lua = lua .. sub
  return foundry_path .. "/" .. lua .. ".lua"
end

local function apply_size (font, size, letterspacing, parameters)
  if (size < 0) then size = (- 655.36) * size end
	local to_size = size / font.units_per_em
  font.size = size
  font.designsize = size
  font.to_size = to_size
  local italic = font.italicangle or 0
  local space, stretch, shrink, extra
  if parameters == "mono" then -- Creates a monospaced font with space equal to the
                               -- width of an "m" and no stretch or shrink.
    space = font.characters[109].width * to_size
    stretch, shrink, extra = 0, 0, 0
  else
    parameters = parameters and str.explode(parameters) or {}
    space      = (parameters[1] or 0.25)     * size
    stretch    = (parameters[2] or 0.166666) * size
    shrink     = (parameters[3] or 0.111111) * size
    extra      = (parameters[4] or 0.111111) * size
  end
  font.parameters = {
      slant         = size * num.floor(num.tan(italic * num.pi/180)), -- \fontdimen 1
      space         = space,      -- \fontdimen 2
      space_stretch = stretch,    -- \fontdimen 3
      space_shrink  = shrink,     -- \fontdimen 4
      x_height      = size * 0.4, -- \fontdimen 5
      quad          = size,       -- \fontdimen 6
      extra_space   = extra       -- \fontdimen 7
    }

  letterspacing = letterspacing or 1
  for c, t in pairs(font.characters) do
    if t.width then
      t.width, t.height, t.depth = t.width * to_size * letterspacing, t.height * to_size, t.depth * to_size
      t.expansion_factor = 1000
      if t.italic then
        t.italic = t.italic * to_size
      end
    end
  end

  return font
end


local get_mods = lp.Ct((lp.space * lp.S"/" * lp.C(lp.alnum^1))^0)
local get_feats = lp.Ct((lp.C((1 - lp.S",;")^1) * (lp.S",;" + -1))^1)
function get_features (features, tb)
  features = lp.match(get_feats, features) or {}
  for _, f in ipairs(features) do
    if str.match(f, "=") then
      local key, val = str.match(f, "%s*(.-)%s*=%s*(.*)")
      val = str.trim(val)
      if val == "false" then
        tb[key] = nil
      else
        tb[key] = val
      end
    else
      f = str.trim(f)
      neg, f = str.extract(f, "^%-")
      if neg then
        tb[f] = nil
      else
        _, f = str.extract(f, "^%+")
        tb[f] = true
      end
    end
  end
end

local lookup_functions = {}

function lookup_functions.gsub_single (tb, f)
  local name_touni = f.name_to_unicode
  for a, b in pairs(tb.pairs) do
    local _a, _b = name_touni[a], name_touni[b]
    f.max_char = f.max_char + 1
    f.characters[f.max_char] = f.characters[_a]
    f.characters[_a] = f.characters[_b]
    name_touni[a], name_touni[b] = f.max_char, _a
  end
  return f
end

function lookup_functions.gsub_ligature (tb, f)
  local name_touni = f.name_to_unicode
  tb.ligs.all_ligs = nil
  for a, tb in pairs(tb.ligs) do
    a = name_touni[a]
    tab.subtable(f.characters[a], "ligatures")
    for b, ttb in pairs(tb) do
      b, c = name_touni[b], name_touni[ttb.char]
      f.characters[a].ligatures[b] = {char = c, type = ttb.type}
    end
  end
  return f
end

local function kern_pairs (tb, firsts, seconds, offset)
  for _, c1 in ipairs(str.explode(firsts)) do
    for __, c2 in ipairs(str.explode(seconds)) do
      tab.subtable(tb, c1)
      tb[c1][c2] = offset
    end
  end
end

local function kern_classes (firsts, seconds, offsets, max)
  local kerns = {}
  for f, F in pairs (firsts) do
    for s, S in pairs (seconds) do
      local off = offsets[(f-1) * max + s]
      if off then
        kern_pairs (kerns, F, S, off)
      end
    end
  end
  return kerns
end

local function apply_kerns (f, kerns, to_size)
  local name_touni = f.name_to_unicode
  to_size = to_size or 1
  for c1, ttb in pairs(kerns) do
    for c2, off in pairs(ttb) do
      tab.subtable(f.characters[name_touni[c1]], "kerns")
      f.characters[name_touni[c1]].kerns[name_touni[c2]] = off * to_size
    end
  end
end

function lookup_functions.gpos_pair (tb, f)
  -- These are the big kern classes.
  if tb.offsets then
    local name_touni = f.name_to_unicode
    for n, off in pairs(tb.offsets) do
      tb.offsets[n] = off * f.to_size
    end
    local kerns = kern_classes(tb.firsts, tb.seconds, tb.offsets, tb.max)
    apply_kerns(f, kerns)
  end
  -- These are the ones retrieved from individual glyphs.
  if tb.kerns then
    apply_kerns(f, tb.kerns, f.to_size)
  end
  return f
end

function lookup_functions.gsub_contextchain (tb, f)
  local name_touni = f.name_to_unicode
  local T = f.contextchain or {}
  for _, llk in ipairs(tb) do
    if fontfile.lookups then
      local sub, Sub = fontfile.lookups[llk].rules[1].lookups
      local chain = fontfile.lookups[llk].rules[1].coverage
      local cur, current = str.explode(chain.current[1]), {}
      local aft, after = chain.after and str.explode(chain.after[1]) or {}, {}
      for _, c in ipairs(cur) do
        c = name_touni[c]
        if sub then
          Sub = {}
          for n, x in ipairs(sub) do
            Sub[n] = name_touni[fontfile.glyphs[f.characters[c].index].lookups[x .. "_s"][1].specification.variant]
          end
        end
        local t = { lookup = Sub}
        tab.subtable(T, C)
        for __, a in ipairs(aft) do
          tab.subtable(t, "after")
          t.after[name_touni[a]] = true
        end
        tab.insert(T[c], t)
      end
    end
  end
  f.contextchain = T
  return f
end

local function _isactive (tb, ft, sc, lg)
  for t in pairs(tb.tags) do
    if ft[t] then
      if t[sc] then
        for _, lang in pairs(tb[sc]) do
          if lang == lg then
            return true
          end
        end
      else
        return true
      end
    end
  end
end


local lookup_types = {  
  "gsub_single",
  "gsub_ligature",
  "gpos_pair"
  }

local function activate_lookups (font, features, script, lang)
  for _, type in ipairs(lookup_types) do
    if font.lookup_table and font.lookup_table[type] then
      for l, tb in pairs(font.lookup_table[type]) do
        if _isactive(tb, features, script, lang) then
          for _, lk in ipairs(tb) do
            local lt = font.lookups[lk]
            if lt then 
              font = lookup_functions[type](lt, font)
            end
          end
        end
      end
    end
  end
  return font
end

local function load_font (name, size, id, done)
  local loaded_font = lfs.find_file(name, "tfm")
  if loaded_font then
    loaded_font = fl.read_tfm(loaded_font, size)
  else
    local original = str.trim(str.match(name, "[^:]*"))
    local family, mods, feats
    family, name = str.extract(name, "([^/:]*)")
    family = str.trim(family)
    mods, name = str.extract(name, "[^:]*")
    mods = lp.match(get_mods, mods) or {}
    feats = str.extract(name, ":(.*)") or ""
    local features = tab.copy(settings.features)
    get_features(feats, features)
    
    local at_size
    if features.size then
      at_size = features.size
    else
      at_size = size
      at_size = at_size > 0 and at_size or at_size * - 655.36
      at_size = at_size / 65536
    end
    local source, lua, add_feats = is_font(family, mods, at_size)
    if add_feats then get_features(add_feats, features) end

    if type(source) == "string" then
      local cache = features.cache or "yes"
      if lua then
        if cache == "no" or cache == "rewrite" then
          loaded_font = create_font(source, lfs.type(source), lua, features.font, cache == "rewrite")
        else
          loaded_font = dofile(lua)
        end
      else
        lua = name_luafile(source, features.font)
        loaded_font = create_font(source, lfs.type(source), lua, features.font, cache ~= "no")
      end
    else
      if not done then
        if type(source) == "number" then
          wri.error("The library says `%s' matches `%s', but I can't find that file anywhere. Clean up your library!", original, lua)
        else
          recheck_fonts()
          return load_font(original, size, id, true)
        end
      else
        wri.error("I can't find `%s'. I return a default font to avoid further errors.", original)
      end
    end

    if loaded_font then

      local expansion = features.expansion and str.explode(features.expansion) or {}
      loaded_font.stretch = expansion[1] or 0
      loaded_font.shrink  = expansion[2] or 0
      loaded_font.step    = expansion[3] or 0

      local extend = features.extend or 1
      loaded_font.extend  = extend * 1000
      local slant
      if features.absoluteslant then
        local italic = loaded_font.italicangle or 0
        slant = features.absoluteslant - italic
      else
        slant = features.slant or 0
      end
      loaded_font.slant   = num.tan(num.rad(slant)) * 1000
      
      loaded_font = apply_size(loaded_font, size, features.letterspacing, features.space)
      loaded_font = activate_lookups(loaded_font, features, features.script, features.lang)

      loaded_font.name = loaded_font.name .. id
      loaded_font.fullname = loaded_font.fullname .. id
      local embedding = features.embedding or "subset"
      if embedding ~= "no" and embedding ~= "subset" and embedding ~= "full" then
        wri.error("Invalid value `%s' for the `embedding' feature. Value should be `no', `subset' or `full'.", embedding)
        embedding = "subset"
      end
      loaded_font.embedding = embedding
    else
      loaded_font = fl.read_tfm(lfs.find_file("cmr10", "tfm"), size)
    end
  end
  return loaded_font
end

callback.register("define_font", load_font)