summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/context/base/mkiv/font-ctx.lua
blob: 9e53b2c25a69f15d747cfd3b110c2e39dfea5dfb (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
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
if not modules then modules = { } end modules ['font-ctx'] = {
    version   = 1.001,
    comment   = "companion to font-ini.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- At some point I will clean up the code here so that at the tex end
-- the table interface is used.
--
-- Todo: make a proper 'next id' mechanism (register etc) or wait till 'true'
-- in virtual fonts indices is implemented.

local context, commands = context, commands

local format, gmatch, match, find, lower, gsub, byte, topattern = string.format, string.gmatch, string.match, string.find, string.lower, string.gsub, string.byte, string.topattern
local concat, serialize, sort, fastcopy, mergedtable = table.concat, table.serialize, table.sort, table.fastcopy, table.merged
local sortedhash, sortedkeys, sequenced = table.sortedhash, table.sortedkeys, table.sequenced
local settings_to_hash, hash_to_string = utilities.parsers.settings_to_hash, utilities.parsers.hash_to_string
local formatcolumns = utilities.formatters.formatcolumns
local mergehashes = utilities.parsers.mergehashes
local formatters = string.formatters
local basename = file.basename

local tostring, next, type, rawget, tonumber = tostring, next, type, rawget, tonumber
local utfchar, utfbyte = utf.char, utf.byte
local round = math.round

local P, S, C, Cc, Cf, Cg, Ct, lpegmatch = lpeg.P, lpeg.S, lpeg.C, lpeg.Cc, lpeg.Cf, lpeg.Cg, lpeg.Ct, lpeg.match

local trace_features      = false  trackers.register("fonts.features",   function(v) trace_features   = v end)
local trace_defining      = false  trackers.register("fonts.defining",   function(v) trace_defining   = v end)
local trace_designsize    = false  trackers.register("fonts.designsize", function(v) trace_designsize = v end)
local trace_usage         = false  trackers.register("fonts.usage",      function(v) trace_usage      = v end)
local trace_mapfiles      = false  trackers.register("fonts.mapfiles",   function(v) trace_mapfiles   = v end)
local trace_automode      = false  trackers.register("fonts.automode",   function(v) trace_automode   = v end)
local trace_merge         = false  trackers.register("fonts.merge",      function(v) trace_merge      = v end)

local report_features     = logs.reporter("fonts","features")
local report_cummulative  = logs.reporter("fonts","cummulative")
local report_defining     = logs.reporter("fonts","defining")
local report_status       = logs.reporter("fonts","status")
local report_mapfiles     = logs.reporter("fonts","mapfiles")
local report_newline      = logs.newline

local setmetatableindex   = table.setmetatableindex

local implement           = interfaces.implement

local fonts               = fonts
local handlers            = fonts.handlers
local otf                 = handlers.otf -- brrr
local afm                 = handlers.afm -- brrr
local tfm                 = handlers.tfm -- brrr
local names               = fonts.names
local definers            = fonts.definers
local specifiers          = fonts.specifiers
local constructors        = fonts.constructors
local loggers             = fonts.loggers
local fontgoodies         = fonts.goodies
local helpers             = fonts.helpers
local hashes              = fonts.hashes
local currentfont         = font.current
local definefont          = font.define

local cleanname           = names.cleanname

local encodings           = fonts.encodings
----- aglunicodes         = encodings.agl.unicodes
local aglunicodes         = nil -- delayed loading

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

local getfield            = nuts.getfield
local setfield            = nuts.setfield
local getattr             = nuts.getattr
local setattr             = nuts.setattr
local getprop             = nuts.getprop
local setprop             = nuts.setprop
local getfont             = nuts.getfont
local setsubtype          = nuts.setsubtype

local texgetattribute     = tex.getattribute
local texsetattribute     = tex.setattribute
local texgetdimen         = tex.getdimen
local texsetcount         = tex.setcount
local texget              = tex.get

local texdefinefont       = tex.definefont
local texsp               = tex.sp

local fontdata            = hashes.identifiers
local characters          = hashes.characters
local descriptions        = hashes.descriptions
local properties          = hashes.properties
local resources           = hashes.resources
local unicodes            = hashes.unicodes
local csnames             = hashes.csnames
local lastmathids         = hashes.lastmathids
local exheights           = hashes.exheights
local emwidths            = hashes.emwidths
local parameters          = hashes.parameters

local designsizefilename  = fontgoodies.designsizes.filename

local ctx_char            = context.char
local ctx_getvalue        = context.getvalue

local otffeatures         = otf.features
local otftables           = otf.tables

local registerotffeature  = otffeatures.register

local sequencers          = utilities.sequencers
local appendgroup         = sequencers.appendgroup
local appendaction        = sequencers.appendaction

specifiers.contextsetups  = specifiers.contextsetups  or { }
specifiers.contextnumbers = specifiers.contextnumbers or { }
specifiers.contextmerged  = specifiers.contextmerged  or { }
specifiers.synonyms       = specifiers.synonyms       or { }

local setups   = specifiers.contextsetups
local numbers  = specifiers.contextnumbers
local merged   = specifiers.contextmerged
local synonyms = specifiers.synonyms

storage.register("fonts/setups" ,  setups ,  "fonts.specifiers.contextsetups" )
storage.register("fonts/numbers",  numbers,  "fonts.specifiers.contextnumbers")
storage.register("fonts/merged",   merged,   "fonts.specifiers.contextmerged")
storage.register("fonts/synonyms", synonyms, "fonts.specifiers.synonyms")

-- inspect(setups)

if environment.initex then
    setmetatableindex(setups,function(t,k)
        return type(k) == "number" and rawget(t,numbers[k]) or nil
    end)
else
    setmetatableindex(setups,function(t,k)
        local v = type(k) == "number" and rawget(t,numbers[k])
        if v then
            t[k] = v
            return v
        end
    end)
end

-- this will move elsewhere ...

local function getfontname(tfmdata)
    return basename(type(tfmdata) == "number" and properties[tfmdata].name or tfmdata.properties.name)
end

helpers.name = getfontname

local addformatter = utilities.strings.formatters.add

if _LUAVERSION < 5.2  then

    addformatter(formatters,"font:name",    [["'"..fontname(%s).."'"]],          "local fontname  = fonts.helpers.name")
    addformatter(formatters,"font:features",[["'"..sequenced(%s," ",true).."'"]],"local sequenced = table.sequenced")

else

    addformatter(formatters,"font:name",    [["'"..fontname(%s).."'"]],          { fontname  = helpers.name })
    addformatter(formatters,"font:features",[["'"..sequenced(%s," ",true).."'"]],{ sequenced = table.sequenced })

end

-- ... like font-sfm or so

constructors.resolvevirtualtoo = true -- context specific (due to resolver)

constructors.sharefonts        = true -- experimental
constructors.nofsharedhashes   = 0
constructors.nofsharedvectors  = 0
constructors.noffontsloaded    = 0

do

    local shares = { }
    local hashes = { }

    local nofinstances = 0
    local instances    = table.setmetatableindex(function(t,k)
        nofinstances = nofinstances + 1
        t[k] = nofinstances
        return nofinstances
    end)

    function constructors.trytosharefont(target,tfmdata)
        constructors.noffontsloaded = constructors.noffontsloaded + 1
        if constructors.sharefonts then
            local fonthash = target.specification.hash
            if fonthash then
                local properties = target.properties
                local fullname   = target.fullname
                local fontname   = target.fontname
                local psname     = target.psname
                -- for the moment here:
                local instance = properties.instance
                if instance then
                    local format = tfmdata.properties.format
                    if format == "opentype" then
                        target.streamprovider = 1
                    elseif format == "truetype" then
                        target.streamprovider = 2
                    else
                        target.streamprovider = 0
                    end
                    if target.streamprovider > 0 then
                        if fullname then
                            fullname = fullname .. ":" .. instances[instance]
                            target.fullname = fullname
                        end
                        if fontname then
                            fontname = fontname .. ":" .. instances[instance]
                            target.fontname = fontname
                        end
                        if psname then
                            -- this one is used for the funny prefix in font names in pdf
                            -- so it has ot be kind of unique in order to avoid subset prefix
                            -- clashes being reported
                            psname = psname   .. ":" .. instances[instance]
                            target.psname = psname
                        end
                    end
                end
                --
                local sharedname = hashes[fonthash]
                if sharedname then
                    -- this is ok for context as we know that only features can mess with font definitions
                    -- so a similar hash means that the fonts are similar too
                    if trace_defining then
                        report_defining("font %a uses backend resources of font %a (%s)",target.fullname,sharedname,"common hash")
                    end
                    target.fullname = sharedname
                    properties.sharedwith = sharedname
                    constructors.nofsharedfonts = constructors.nofsharedfonts + 1
                    constructors.nofsharedhashes = constructors.nofsharedhashes + 1
                else
                    -- the one takes more time (in the worst case of many cjk fonts) but it also saves
                    -- embedding time .. haha, this is interesting: when i got a clash on subset tag
                    -- collision i saw in the source that these tags are also using a hash like below
                    -- so maybe we should have an option to pass it from lua
                    local characters = target.characters
                    local n = 1
                    local t = { target.psname }
                    -- for the moment here:
                    if instance then
                        n = n + 1
                        t[n] = instance
                    end
                    --
                    local u = sortedkeys(characters)
                    for i=1,#u do
                        local k = u[i]
                        n = n + 1 ; t[n] = k
                        n = n + 1 ; t[n] = characters[k].index or k
                    end
                    local checksum   = md5.HEX(concat(t," "))
                    local sharedname = shares[checksum]
                    local fullname   = target.fullname
                    if sharedname then
                        if trace_defining then
                            report_defining("font %a uses backend resources of font %a (%s)",fullname,sharedname,"common vector")
                        end
                        fullname = sharedname
                        properties.sharedwith= sharedname
                        constructors.nofsharedfonts = constructors.nofsharedfonts + 1
                        constructors.nofsharedvectors = constructors.nofsharedvectors + 1
                    else
                        shares[checksum] = fullname
                    end
                    target.fullname  = fullname
                    hashes[fonthash] = fullname
                end
            end
        end
    end

end

directives.register("fonts.checksharing",function(v)
    if not v then
        report_defining("font sharing in backend is disabled")
    end
    constructors.sharefonts = v
end)

function definers.resetnullfont()
    -- resetting is needed because tikz misuses nullfont
    local parameters = fonts.nulldata.parameters
    --
    parameters.slant         = 0 -- 1
    parameters.space         = 0 -- 2
    parameters.space_stretch = 0 -- 3
    parameters.space_shrink  = 0 -- 4
    parameters.x_height      = 0 -- 5
    parameters.quad          = 0 -- 6
    parameters.extra_space   = 0 -- 7
    --
    constructors.enhanceparameters(parameters) -- official copies for us
    --
    definers.resetnullfont = function() end
end

implement {
    name     = "resetnullfont",
    onlyonce = true,
    actions  = function()
        for i=1,7 do
            -- we have no direct method yet
            context([[\fontdimen%s\nullfont\zeropoint]],i)
        end
        definers.resetnullfont()
    end
}

-- this cannot be a feature initializer as there is no auto namespace
-- so we never enter the loop then; we can store the defaults in the tma
-- file (features.gpos.mkmk = 1 etc)

local needsnodemode = { -- we will have node mode by default anyway
 -- gsub_single              = true,
    gsub_multiple            = true,
 -- gsub_alternate           = true,
 -- gsub_ligature            = true,
    gsub_context             = true,
    gsub_contextchain        = true,
    gsub_reversecontextchain = true,
 -- chainsub                 = true,
 -- reversesub               = true,
    gpos_mark2base           = true,
    gpos_mark2ligature       = true,
    gpos_mark2mark           = true,
    gpos_cursive             = true,
 -- gpos_single              = true,
 -- gpos_pair                = true,
    gpos_context             = true,
    gpos_contextchain        = true,
}

otftables.scripts.auto = "automatic fallback to latn when no dflt present"

-- setmetatableindex(otffeatures.descriptions,otftables.features)

local function checkedscript(tfmdata,resources,features)
    local latn   = false
    local script = false
    if resources.features then
        for g, list in next, resources.features do
            for f, scripts in next, list do
                if scripts.dflt then
                    script = "dflt"
                    break
                elseif scripts.latn then
                    latn = true
                end
            end
        end
    end
    if not script then
        script = latn and "latn" or "dflt"
    end
    if trace_automode then
        report_defining("auto script mode, using script %a in font %!font:name!",script,tfmdata)
    end
    features.script = script
    return script
end

-- basemode combined with dynamics is somewhat tricky

local function checkedmode(tfmdata,resources,features)
    local sequences = resources.sequences
    if sequences and #sequences > 0 then
        local script    = features.script   or "dflt"
        local language  = features.language or "dflt"
        for feature, value in next, features do
            if value then
                local found = false
                for i=1,#sequences do
                    local sequence = sequences[i]
                    local features = sequence.features
                    if features then
                        local scripts = features[feature]
                        if scripts then
                            local languages = scripts[script]
                            if languages and languages[language] then
                                if found then
                                    -- more than one lookup
                                    if trace_automode then
                                        report_defining("forcing mode %a, font %!font:name!, feature %a, script %a, language %a, %s",
                                            "node",tfmdata,feature,script,language,"multiple lookups")
                                    end
                                    features.mode = "node"
                                    return "node"
                                elseif needsnodemode[sequence.type] then
                                    if trace_automode then
                                        report_defining("forcing mode %a, font %!font:name!, feature %a, script %a, language %a, %s",
                                            "node",tfmdata,feature,script,language,"no base support")
                                    end
                                    features.mode = "node"
                                    return "node"
                                else
                                    -- at least one lookup
                                    found = true
                                end
                            end
                        end
                    end
                end
            end
        end
    end
    if trace_automode then
        report_defining("forcing mode base, font %!font:name!",tfmdata)
    end
    features.mode = "base" -- new, or is this wrong?
    return "base"
end

definers.checkedscript = checkedscript
definers.checkedmode   = checkedmode

local function modechecker(tfmdata,features,mode) -- we cannot adapt features as they are shared!
    if trace_features then
        report_features("fontname %!font:name!, features %!font:features!",tfmdata,features)
    end
    local rawdata   = tfmdata.shared.rawdata
    local resources = rawdata and rawdata.resources
    local script    = features.script
    if resources then
        if script == "auto" then
            script = checkedscript(tfmdata,resources,features)
        end
        if mode == "auto" then
            mode = checkedmode(tfmdata,resources,features)
        end
    else
        report_features("missing resources for font %!font:name!",tfmdata)
    end
    return mode
end

registerotffeature {
    -- we only set the checker and leave other settings of the mode
    -- feature as they are
    name        = "mode",
    modechecker = modechecker,
}

-- -- default = true anyway
--
-- local normalinitializer = constructors.getfeatureaction("otf","initializers","node","analyze")
--
-- local function analyzeinitializer(tfmdata,value,features) -- attr
--     if value == "auto" and features then
--         value = features.init or features.medi or features.fina or features.isol or false
--     end
--     return normalinitializer(tfmdata,value,features)
-- end
--
-- registerotffeature {
--     name         = "analyze",
--     initializers = {
--         node = analyzeinitializer,
--     },
-- }

local beforecopyingcharacters = sequencers.new {
    name      = "beforecopyingcharacters",
    arguments = "target,original",
}

appendgroup(beforecopyingcharacters,"before") -- user
appendgroup(beforecopyingcharacters,"system") -- private
appendgroup(beforecopyingcharacters,"after" ) -- user

function constructors.beforecopyingcharacters(original,target)
    local runner = beforecopyingcharacters.runner
    if runner then
        runner(original,target)
    end
end

local aftercopyingcharacters = sequencers.new {
    name      = "aftercopyingcharacters",
    arguments = "target,original",
}

appendgroup(aftercopyingcharacters,"before") -- user
appendgroup(aftercopyingcharacters,"system") -- private
appendgroup(aftercopyingcharacters,"after" ) -- user

function constructors.aftercopyingcharacters(original,target)
    local runner = aftercopyingcharacters.runner
    if runner then
        runner(original,target)
    end
end

--[[ldx--
<p>So far we haven't really dealt with features (or whatever we want
to pass along with the font definition. We distinguish the following
situations:</p>
situations:</p>

<code>
name:xetex like specs
name@virtual font spec
name*context specification
</code>
--ldx]]--

-- currently fonts are scaled while constructing the font, so we
-- have to do scaling of commands in the vf at that point using e.g.
-- "local scale = g.parameters.factor or 1" after all, we need to
-- work with copies anyway and scaling needs to be done at some point;
-- however, when virtual tricks are used as feature (makes more
-- sense) we scale the commands in fonts.constructors.scale (and set the
-- factor there)

local loadfont = definers.loadfont

function definers.loadfont(specification,size,id) -- overloads the one in font-def
    local variants = definers.methods.variants
    local virtualfeatures = specification.features.virtual
    if virtualfeatures and virtualfeatures.preset then
        local variant = variants[virtualfeatures.preset]
        if variant then
            return variant(specification,size,id)
        end
    else
        local tfmdata = loadfont(specification,size,id)
     -- constructors.checkvirtualid(tfmdata,id)
        return tfmdata
    end
end

local function predefined(specification)
    local variants = definers.methods.variants
    local detail = specification.detail
    if detail ~= "" and variants[detail] then
        specification.features.virtual = { preset = detail }
    end
    return specification
end

definers.registersplit("@", predefined,"virtual")

local normalize_features = otffeatures.normalize     -- should be general

local function definecontext(name,t) -- can be shared
    local number = setups[name] and setups[name].number or 0 -- hm, numbers[name]
    if number == 0 then
        number = #numbers + 1
        numbers[number] = name
    end
    t.number = number
    setups[name] = t
    return number, t
end

local function presetcontext(name,parent,features) -- will go to con and shared
    if features == "" and find(parent,"=",1,true) then
        features = parent
        parent = ""
    end
    if not features or features == "" then
        features = { }
    elseif type(features) == "string" then
        features = normalize_features(settings_to_hash(features))
    else
        features = normalize_features(features)
    end
    -- todo: synonyms, and not otf bound
    if parent ~= "" then
        for p in gmatch(parent,"[^, ]+") do
            local s = setups[p]
            if s then
                for k, v in next, s do
-- no, as then we cannot overload: e.g. math,mathextra
--                     if features[k] == nil then
                        features[k] = v
--                     end
                end
            else
                -- just ignore an undefined one .. i.e. we can refer to not yet defined
            end
        end
    end
    -- these are auto set so in order to prevent redundant definitions
    -- we need to preset them (we hash the features and adding a default
    -- setting during initialization may result in a different hash)
    --
    -- for k,v in next, triggers do
    --     if features[v] == nil then -- not false !
    --         local vv = default_features[v]
    --         if vv then features[v] = vv end
    --     end
    -- end
    --
    for feature,value in next, features do
        if value == nil then -- not false !
            local default = default_features[feature]
            if default ~= nil then
                features[feature] = default
            end
        end
    end
    -- sparse 'm so that we get a better hash and less test (experimental
    -- optimization)
    local t = { } -- can we avoid t ?
    for k,v in next, features do
     -- if v then t[k] = v end
        t[k] = v
    end
    -- needed for dynamic features
    -- maybe number should always be renewed as we can redefine features
    local number = setups[name] and setups[name].number or 0 -- hm, numbers[name]
    if number == 0 then
        number = #numbers + 1
        numbers[number] = name
    end
    t.number = number
    setups[name] = t
    return number, t
end

local function adaptcontext(pattern,features)
    local pattern = topattern(pattern,false,true)
    for name in next, setups do
        if find(name,pattern) then
            presetcontext(name,name,features)
        end
    end
end

-- local function contextnumber(name) -- will be replaced
--     local t = setups[name]
--     if not t then
--         return 0
--     elseif t.auto then -- check where used, autolanguage / autoscript?
--         local lng = tonumber(tex.language)
--         local tag = name .. ":" .. lng
--         local s = setups[tag]
--         if s then
--             return s.number or 0
--         else
--             local script, language = languages.association(lng)
--             if t.script ~= script or t.language ~= language then
--                 local s = fastcopy(t)
--                 local n = #numbers + 1
--                 setups[tag] = s
--                 numbers[n] = tag
--                 s.number = n
--                 s.script = script
--                 s.language = language
--                 return n
--             else
--                 setups[tag] = t
--                 return t.number or 0
--             end
--         end
--     else
--         return t.number or 0
--     end
-- end

local function contextnumber(name) -- will be replaced
    local t = setups[name]
    return t and t.number or 0
end

local function mergecontext(currentnumber,extraname,option) -- number string number (used in scrp-ini
    local extra = setups[extraname]
    if extra then
        local current = setups[numbers[currentnumber]]
        local mergedfeatures = { }
        local mergedname = nil
        if option < 0 then
            if current then
                for k, v in next, current do
                    if not extra[k] then
                        mergedfeatures[k] = v
                    end
                end
            end
            mergedname = currentnumber .. "-" .. extraname
        else
            if current then
                for k, v in next, current do
                    mergedfeatures[k] = v
                end
            end
            for k, v in next, extra do
                mergedfeatures[k] = v
            end
            mergedname = currentnumber .. "+" .. extraname
        end
        local number = #numbers + 1
        mergedfeatures.number = number
        numbers[number] = mergedname
        merged[number] = option
        setups[mergedname] = mergedfeatures
        return number -- contextnumber(mergedname)
    else
        return currentnumber
    end
end

local extrasets = { }

setmetatableindex(extrasets,function(t,k)
    local v = mergehashes(setups,k)
    t[k] = v
    return v
end)

local function mergecontextfeatures(currentname,extraname,how,mergedname) -- string string
    local extra = setups[extraname] or extrasets[extraname]
    if extra then
        local current = setups[currentname]
        local mergedfeatures = { }
        if how == "+" then
            if current then
                for k, v in next, current do
                    mergedfeatures[k] = v
                end
            end
            for k, v in next, extra do
                mergedfeatures[k] = v
            end
            if trace_merge then
                report_features("merge %a, method %a, current %|T, extra %|T, result %|T",mergedname,"add",current or { },extra,mergedfeatures)
            end
        elseif how == "-" then
            if current then
                for k, v in next, current do
                    mergedfeatures[k] = v
                end
            end
            for k, v in next, extra do
                -- only boolean features
                if v == true then
                    mergedfeatures[k] = false
                end
            end
            if trace_merge then
                report_features("merge %a, method %a, current %|T, extra %|T, result %|T",mergedname,"subtract",current or { },extra,mergedfeatures)
            end
        else -- =
            for k, v in next, extra do
                mergedfeatures[k] = v
            end
            if trace_merge then
                report_features("merge %a, method %a, result %|T",mergedname,"replace",mergedfeatures)
            end
        end
        local number = #numbers + 1
        mergedfeatures.number = number
        numbers[number] = mergedname
        merged[number] = option
        setups[mergedname] = mergedfeatures
        return number
    else
        return numbers[currentname] or 0
    end
end

local function registercontext(fontnumber,extraname,option)
    local extra = setups[extraname]
    if extra then
        local mergedfeatures, mergedname = { }, nil
        if option < 0 then
            mergedname = fontnumber .. "-" .. extraname
        else
            mergedname = fontnumber .. "+" .. extraname
        end
        for k, v in next, extra do
            mergedfeatures[k] = v
        end
        local number = #numbers + 1
        mergedfeatures.number = number
        numbers[number] = mergedname
        merged[number] = option
        setups[mergedname] = mergedfeatures
        return number -- contextnumber(mergedname)
    else
        return 0
    end
end

local function registercontextfeature(mergedname,extraname,how)
    local extra = setups[extraname]
    if extra then
        local mergedfeatures = { }
        for k, v in next, extra do
            mergedfeatures[k] = v
        end
        local number = #numbers + 1 -- we somehow end up with steps of 2
        mergedfeatures.number = number
        numbers[number] = mergedname
        merged[number] = how == "=" and 1 or 2 -- 1=replace, 2=combine
        setups[mergedname] = mergedfeatures
        return number -- contextnumber(mergedname)
    else
        report_features("unknown feature %a cannot be merged into %a using method %a",extraname,mergedname,how)
        return 0
    end
end

specifiers.presetcontext   = presetcontext
specifiers.contextnumber   = contextnumber
specifiers.mergecontext    = mergecontext
specifiers.registercontext = registercontext
specifiers.definecontext   = definecontext

-- we extend the hasher:

-- constructors.hashmethods.virtual = function(list)
--     local s = { }
--     local n = 0
--     for k, v in next, list do
--         n = n + 1
--         s[n] = k -- no checking on k
--     end
--     if n > 0 then
--         sort(s)
--         for i=1,n do
--             local k = s[i]
--             s[i] = k .. '=' .. tostring(list[k])
--         end
--         return concat(s,"+")
--     end
-- end

constructors.hashmethods.virtual = function(list)
    local s = { }
    local n = 0
    for k, v in next, list do
        n = n + 1
     -- if v == true then
     --     s[n] = k .. '=true'
     -- elseif v == false then
     --     s[n] = k .. '=false'
     -- else
     --     s[n] = k .. "=" .. v
     -- end
        s[n] = k .. "=" .. tostring(v)
    end
    if n > 0 then
        sort(s)
        return concat(s,"+")
    end
end

-- end of redefine

-- local withcache = { } -- concat might be less efficient than nested tables
--
-- local function withset(name,what)
--     local zero = texgetattribute(0)
--     local hash = zero .. "+" .. name .. "*" .. what
--     local done = withcache[hash]
--     if not done then
--         done = mergecontext(zero,name,what)
--         withcache[hash] = done
--     end
--     texsetattribute(0,done)
-- end
--
-- local function withfnt(name,what,font)
--     local font = font or currentfont()
--     local hash = font .. "*" .. name .. "*" .. what
--     local done = withcache[hash]
--     if not done then
--         done = registercontext(font,name,what)
--         withcache[hash] = done
--     end
--     texsetattribute(0,done)
-- end

function specifiers.showcontext(name)
    return setups[name] or setups[numbers[name]] or setups[numbers[tonumber(name)]] or { }
end

-- we need a copy as we will add (fontclass) goodies to the features and
-- that is bad for a shared table

-- local function splitcontext(features) -- presetcontext creates dummy here
--     return fastcopy(setups[features] or (presetcontext(features,"","") and setups[features]))
-- end

local function splitcontext(features) -- presetcontext creates dummy here
    local sf = setups[features]
    if not sf then
        local n -- number
        if find(features,",",a,true) then
            -- let's assume a combination which is not yet defined but just specified (as in math)
            n, sf = presetcontext(features,features,"")
        else
            -- we've run into an unknown feature and or a direct spec so we create a dummy
            n, sf = presetcontext(features,"","")
        end
    end
    return fastcopy(sf)
end

-- local splitter = lpeg.splitat("=")
--
-- local function splitcontext(features)
--     local setup = setups[features]
--     if setup then
--         return setup
--     elseif find(features,",",1,true) then
--         -- This is not that efficient but handy anyway for quick and dirty tests
--         -- beware, due to the way of caching setups you can get the wrong results
--         -- when components change. A safeguard is to nil the cache.
--         local merge = nil
--         for feature in gmatch(features,"[^, ]+") do
--             if find(feature,"=",1,true) then
--                 local k, v = lpegmatch(splitter,feature)
--                 if k and v then
--                     if not merge then
--                         merge = { k = v }
--                     else
--                         merge[k] = v
--                     end
--                 end
--             else
--                 local s = setups[feature]
--                 if not s then
--                     -- skip
--                 elseif not merge then
--                     merge = s
--                 else
--                     for k, v in next, s do
--                         merge[k] = v
--                     end
--                 end
--             end
--         end
--         setup = merge and presetcontext(features,"",merge) and setups[features]
--         -- actually we have to nil setups[features] in order to permit redefinitions
--         setups[features] = nil
--     end
--     return setup or (presetcontext(features,"","") and setups[features]) -- creates dummy
-- end

specifiers.splitcontext = splitcontext

function specifiers.contexttostring(name,kind,separator,yes,no,strict,omit) -- not used
    return hash_to_string(
        mergedtable(handlers[kind].features.defaults or {},setups[name] or {}),
        separator, yes, no, strict, omit or { "number" }
    )
end

local function starred(features) -- no longer fallbacks here
    local detail = features.detail
    if detail and detail ~= "" then
        features.features.normal = splitcontext(detail)
    else
        features.features.normal = { }
    end
    return features
end

definers.registersplit('*',starred,"featureset")

-- sort of xetex mode, but without [] and / as we have file: and name: etc

local space      = P(" ")
local spaces     = space^0
local separator  = S(";,")
local equal      = P("=")
local sometext   = C((1-equal-space-separator)^1)
local truevalue  = P("+") * spaces * sometext                           * Cc(true)
local falsevalue = P("-") * spaces * sometext                           * Cc(false)
local somevalue  =                   sometext * spaces                  * Cc(true)
local keyvalue   =                   sometext * spaces * equal * spaces * sometext
local pattern    = Cf(Ct("") * (space + separator + Cg(falsevalue + truevalue + keyvalue + somevalue))^0, rawset)

local function colonized(specification)
    specification.features.normal = normalize_features(lpegmatch(pattern,specification.detail))
    return specification
end

definers.registersplit(":",colonized,"direct")

-- define (two steps)

----- space        = P(" ")
----- spaces       = space^0
local leftparent   = (P"(")
local rightparent  = (P")")
local value        = C((leftparent * (1-rightparent)^0 * rightparent + (1-space))^1)
local dimension    = C((space/"" + P(1))^1)
local rest         = C(P(1)^0)
local scale_none   =                     Cc(0)
local scale_at     = (P("at") +P("@")) * Cc(1) * spaces * dimension -- dimension
local scale_sa     = P("sa")           * Cc(2) * spaces * dimension -- number
local scale_mo     = P("mo")           * Cc(3) * spaces * dimension -- number
local scale_scaled = P("scaled")       * Cc(4) * spaces * dimension -- number
local scale_ht     = P("ht")           * Cc(5) * spaces * dimension -- dimension
local scale_cp     = P("cp")           * Cc(6) * spaces * dimension -- dimension

local specialscale = { [5] = "ht", [6] = "cp" }

local sizepattern  = spaces * (scale_at + scale_sa + scale_mo + scale_ht + scale_cp + scale_scaled + scale_none)
local splitpattern = spaces * value * spaces * rest

function helpers.splitfontpattern(str)
    local name, size = lpegmatch(splitpattern,str)
    local kind, size = lpegmatch(sizepattern,size)
    return name, kind, size
end

function helpers.fontpatternhassize(str)
    local name, size = lpegmatch(splitpattern,str)
    local kind, size = lpegmatch(sizepattern,size)
    return size or false
end

local specification -- still needed as local ?

local getspecification = definers.getspecification

-- we can make helper macros which saves parsing (but normaly not
-- that many calls, e.g. in mk a couple of 100 and in metafun 3500)

local specifiers = { }

do  -- else too many locals

    ----- ctx_setdefaultfontname = context.fntsetdefname
    ----- ctx_setsomefontname    = context.fntsetsomename
    ----- ctx_setemptyfontsize   = context.fntsetnopsize
    ----- ctx_setsomefontsize    = context.fntsetsomesize
    ----- ctx_letvaluerelax      = context.letvaluerelax

    local starttiming            = statistics.starttiming
    local stoptiming             = statistics.stoptiming

    local scanners               = tokens.scanners
    local scanstring             = scanners.string
    local scaninteger            = scanners.integer
    local scannumber             = scanners.number
    local scanboolean            = scanners.boolean

    local setmacro               = tokens.setters.macro

    local scanners               = interfaces.scanners

 -- function commands.definefont_one(str)

    scanners.definefont_one = function()
        local str = scanstring()

        starttiming(fonts)
        if trace_defining then
            report_defining("memory usage before: %s",statistics.memused())
            report_defining("start stage one: %s",str)
        end
        local fullname, size = lpegmatch(splitpattern,str)
        local lookup, name, sub, method, detail = getspecification(fullname)
        if not name then
            report_defining("strange definition %a",str)
         -- ctx_setdefaultfontname()
        elseif name == "unknown" then
         -- ctx_setdefaultfontname()
        else
         -- ctx_setsomefontname(name)
            setmacro("somefontname",name,"global")
        end
        -- we can also use a count for the size
        if size and size ~= "" then
            local mode, size = lpegmatch(sizepattern,size)
            if size and mode then
                texsetcount("scaledfontmode",mode)
             -- ctx_setsomefontsize(size)
                setmacro("somefontsize",size)
            else
                texsetcount("scaledfontmode",0)
             -- ctx_setemptyfontsize()
            end
        elseif true then
            -- so we don't need to check in tex
            texsetcount("scaledfontmode",2)
         -- ctx_setemptyfontsize()
        else
            texsetcount("scaledfontmode",0)
         -- ctx_setemptyfontsize()
        end
        specification = definers.makespecification(str,lookup,name,sub,method,detail,size)
        if trace_defining then
            report_defining("stop stage one")
        end
    end

    local n = 0

    -- we can also move rscale to here (more consistent)
    -- the argument list will become a table

    local function nice_cs(cs)
        return (gsub(cs,".->", ""))
    end

 -- function commands.definefont_two(global,cs,str,size,inheritancemode,classfeatures,fontfeatures,classfallbacks,fontfallbacks,
 --     mathsize,textsize,relativeid,classgoodies,goodies,classdesignsize,fontdesignsize,scaledfontmode)

    scanners.definefont_two = function()

        local global          = scanboolean() -- \ifx\fontclass\empty\s!false\else\s!true\fi
        local cs              = scanstring () -- {#csname}%
        local str             = scanstring () -- \somefontfile
        local size            = scaninteger() -- \d_font_scaled_font_size
        local inheritancemode = scaninteger() -- \c_font_feature_inheritance_mode
        local classfeatures   = scanstring () -- \m_font_class_features
        local fontfeatures    = scanstring () -- \m_font_features
        local classfallbacks  = scanstring () -- \m_font_class_fallbacks
        local fontfallbacks   = scanstring () -- \m_font_fallbacks
        local mathsize        = scaninteger() -- \fontface
        local textsize        = scaninteger() -- \d_font_scaled_text_face
        local relativeid      = scaninteger() -- \relativefontid
        local classgoodies    = scanstring () -- \m_font_class_goodies
        local goodies         = scanstring () -- \m_font_goodies
        local classdesignsize = scanstring () -- \m_font_class_designsize
        local fontdesignsize  = scanstring () -- \m_font_designsize
        local scaledfontmode  = scaninteger() -- \scaledfontmode

        if trace_defining then
            report_defining("start stage two: %s, size %s, features %a & %a",str,size,classfeatures,fontfeatures)
        end
        -- name is now resolved and size is scaled cf sa/mo
        local lookup, name, sub, method, detail = getspecification(str or "")
        -- new (todo: inheritancemode)
        local designsize = fontdesignsize ~= "" and fontdesignsize or classdesignsize or ""
        local designname = designsizefilename(name,designsize,size)
        if designname and designname ~= "" then
            if trace_defining or trace_designsize then
                report_defining("remapping name %a, specification %a, size %a, designsize %a",name,designsize,size,designname)
            end
            -- we don't catch detail here
            local o_lookup, o_name, o_sub, o_method, o_detail = getspecification(designname)
            if o_lookup and o_lookup ~= "" then lookup = o_lookup end
            if o_method and o_method ~= "" then method = o_method end
            if o_detail and o_detail ~= "" then detail = o_detail end
            name = o_name
            sub = o_sub
        end
        -- so far
        -- some settings can have been overloaded
        if lookup and lookup ~= "" then
            specification.lookup = lookup
        end
        if relativeid and relativeid ~= "" then -- experimental hook
            local id = tonumber(relativeid) or 0
            specification.relativeid = id > 0 and id
        end
        --
        specification.name      = name
        specification.size      = size
        specification.sub       = (sub and sub ~= "" and sub) or specification.sub
        specification.mathsize  = mathsize
        specification.textsize  = textsize
        specification.goodies   = goodies
        specification.cs        = cs
        specification.global    = global
        specification.scalemode = scaledfontmode -- context specific
        if detail and detail ~= "" then
            specification.method = method or "*"
            specification.detail = detail
        elseif specification.detail and specification.detail ~= "" then
            -- already set
        elseif inheritancemode == 0 then
            -- nothing
        elseif inheritancemode == 1 then
            -- fontonly
            if fontfeatures and fontfeatures ~= "" then
                specification.method = "*"
                specification.detail = fontfeatures
            end
            if fontfallbacks and fontfallbacks ~= "" then
                specification.fallbacks = fontfallbacks
            end
        elseif inheritancemode == 2 then
            -- classonly
            if classfeatures and classfeatures ~= "" then
                specification.method = "*"
                specification.detail = classfeatures
            end
            if classfallbacks and classfallbacks ~= "" then
                specification.fallbacks = classfallbacks
            end
        elseif inheritancemode == 3 then
            -- fontfirst
            if fontfeatures and fontfeatures ~= "" then
                specification.method = "*"
                specification.detail = fontfeatures
            elseif classfeatures and classfeatures ~= "" then
                specification.method = "*"
                specification.detail = classfeatures
            end
            if fontfallbacks and fontfallbacks ~= "" then
                specification.fallbacks = fontfallbacks
            elseif classfallbacks and classfallbacks ~= "" then
                specification.fallbacks = classfallbacks
            end
        elseif inheritancemode == 4 then
            -- classfirst
            if classfeatures and classfeatures ~= "" then
                specification.method = "*"
                specification.detail = classfeatures
            elseif fontfeatures and fontfeatures ~= "" then
                specification.method = "*"
                specification.detail = fontfeatures
            end
            if classfallbacks and classfallbacks ~= "" then
                specification.fallbacks = classfallbacks
            elseif fontfallbacks and fontfallbacks ~= "" then
                specification.fallbacks = fontfallbacks
            end
        end
        local tfmdata = definers.read(specification,size) -- id not yet known (size in spec?)
        --
        local lastfontid = 0
        if not tfmdata then
            report_defining("unable to define %a as %a",name,nice_cs(cs))
            lastfontid = -1
            texsetcount("scaledfontsize",0)
         -- ctx_letvaluerelax(cs) -- otherwise the current definition takes the previous one
        elseif type(tfmdata) == "number" then
            if trace_defining then
                report_defining("reusing %s, id %a, target %a, features %a / %a, fallbacks %a / %a, goodies %a / %a, designsize %a / %a",
                    name,tfmdata,nice_cs(cs),classfeatures,fontfeatures,classfallbacks,fontfallbacks,classgoodies,goodies,classdesignsize,fontdesignsize)
            end
            csnames[tfmdata] = specification.cs
            texdefinefont(global,cs,tfmdata)
            -- resolved (when designsize is used):
            local size = fontdata[tfmdata].parameters.size or 0
         -- ctx_setsomefontsize(size .. "sp")
            setmacro("somefontsize",size.."sp")
            texsetcount("scaledfontsize",size)
            lastfontid = tfmdata
        else
            -- setting the extra characters will move elsewhere
            local characters = tfmdata.characters
            local parameters = tfmdata.parameters
            -- we use char0 as signal; cf the spec pdf can handle this (no char in slot)
            characters[0] = nil
         -- characters[0x00A0] = { width = parameters.space }
         -- characters[0x2007] = { width = characters[0x0030] and characters[0x0030].width or parameters.space } -- figure
         -- characters[0x2008] = { width = characters[0x002E] and characters[0x002E].width or parameters.space } -- period
            --
            constructors.checkvirtualids(tfmdata) -- experiment, will become obsolete when slots can selfreference
            local id = definefont(tfmdata)
            csnames[id] = specification.cs
            tfmdata.properties.id = id
            definers.register(tfmdata,id) -- to be sure, normally already done
            texdefinefont(global,cs,id)
            constructors.cleanuptable(tfmdata)
            constructors.finalize(tfmdata)
            if trace_defining then
                report_defining("defining %a, id %a, target %a, features %a / %a, fallbacks %a / %a",
                    name,id,nice_cs(cs),classfeatures,fontfeatures,classfallbacks,fontfallbacks)
            end
            -- resolved (when designsize is used):
            local size = tfmdata.parameters.size or 655360
            setmacro("somefontsize",size.."sp")
         -- ctx_setsomefontsize(size .. "sp")
            texsetcount("scaledfontsize",size)
            lastfontid = id
        end
        if trace_defining then
            report_defining("memory usage after: %s",statistics.memused())
            report_defining("stop stage two")
        end
        --
        texsetcount("global","lastfontid",lastfontid)
        specifiers[lastfontid] = { str, size }
        if not mathsize then
            -- forget about it
        elseif mathsize == 0 then
            lastmathids[1] = lastfontid
        else
            lastmathids[mathsize] = lastfontid
        end
        --
        stoptiming(fonts)
    end

    function scanners.specifiedfontspec()
        local f = specifiers[scaninteger()]
        if f then
            context(f[1])
        end
    end
    function scanners.specifiedfontsize()
        local f = specifiers[scaninteger()]
        if f then
            context(f[2])
        end
    end
    function scanners.specifiedfont()
        local f = specifiers[scaninteger()]
        local s = scannumber()
        if f and s then
            context("%s at %0.2p",f[1],s * f[2]) -- we round to 2 decimals (as at the tex end)
        end
    end

    --

    function definers.define(specification)
        --
        local name = specification.name
        if not name or name == "" then
            return -1
        else
            starttiming(fonts)
            --
            -- following calls expect a few properties to be set:
            --
            local lookup, name, sub, method, detail = getspecification(name or "")
            --
            specification.name          = (name ~= "" and name) or specification.name
            --
            specification.lookup        = specification.lookup or (lookup ~= "" and lookup) or "file"
            specification.size          = specification.size                                or 655260
            specification.sub           = specification.sub    or (sub    ~= "" and sub)    or ""
            specification.method        = specification.method or (method ~= "" and method) or "*"
            specification.detail        = specification.detail or (detail ~= "" and detail) or ""
            --
            if type(specification.size) == "string" then
                specification.size = texsp(specification.size) or 655260
            end
            --
            specification.specification = "" -- not used
            specification.resolved      = ""
            specification.forced        = ""
            specification.features      = { } -- via detail, maybe some day
            --
            -- we don't care about mathsize textsize goodies fallbacks
            --
            local cs = specification.cs
            if cs == "" then
                cs = nil
                specification.cs = nil
                specification.global = false
            elseif specification.global == nil then
                specification.global = false
            end
            --
            local tfmdata = definers.read(specification,specification.size)
            if not tfmdata then
                return -1, nil
            elseif type(tfmdata) == "number" then
                if cs then
                    texdefinefont(specification.global,cs,tfmdata)
                    csnames[tfmdata] = cs
                end
                return tfmdata, fontdata[tfmdata]
            else
                constructors.checkvirtualids(tfmdata) -- experiment, will become obsolete when slots can selfreference
                local id = definefont(tfmdata)
                tfmdata.properties.id = id
                definers.register(tfmdata,id)
                if cs then
                    texdefinefont(specification.global,cs,id)
                    csnames[id] = cs
                end
                constructors.cleanuptable(tfmdata)
                constructors.finalize(tfmdata)
                return id, tfmdata
            end
            stoptiming(fonts)
        end
    end

    -- local id, cs = fonts.definers.internal { }
    -- local id, cs = fonts.definers.internal { number = 2 }
    -- local id, cs = fonts.definers.internal { name = "dejavusans" }

    local n = 0

    function definers.internal(specification,cs)
        specification = specification or { }
        local name    = specification.name
        local size    = tonumber(specification.size)
        local number  = tonumber(specification.number)
        local id      = nil
        if not size then
            size = texgetdimen("bodyfontsize")
        end
        if number then
            id = number
        elseif name and name ~= "" then
            local cs = cs or specification.cs
            if not cs then
                n  = n + 1 -- beware ... there can be many and they are often used once
             -- cs = formatters["internal font %s"](n)
                cs = "internal font " .. n
            else
                specification.cs = cs
            end
            id = definers.define {
                name = name,
                size = size,
                cs   = cs,
            }
        end
        if not id then
            id = currentfont()
        end
        return id, csnames[id]
    end

    -- here

    local infofont = 0

    function fonts.infofont()
        if infofont == 0 then
            infofont = definers.define { name = "dejavusansmono", size = tex.sp("6pt") }
        end
        return infofont
    end

end

local enable_auto_r_scale = false

experiments.register("fonts.autorscale", function(v)
    enable_auto_r_scale = v
end)

-- Not ok, we can best use a database for this. The problem is that we
-- have delayed definitions and so we never know what style is taken
-- as start.

local calculatescale  = constructors.calculatescale

function constructors.calculatescale(tfmdata,scaledpoints,relativeid,specification)
    if specification then
        local scalemode = specification.scalemode
        local special   = scalemode and specialscale[scalemode]
        if special then
            -- we also have available specification.textsize
            local parameters = tfmdata.parameters
         -- local designsize = parameters.designsize
            if     special == "ht" then
                local height = parameters.ascender / parameters.units
                scaledpoints = scaledpoints / height
            elseif special == "cp" then
                local glyph  = tfmdata.descriptions[utfbyte("X")]
                local height = (glyph and glyph.height or parameters.ascender) / parameters.units
                scaledpoints = scaledpoints / height
            end
        end
    end
    local scaledpoints, delta = calculatescale(tfmdata,scaledpoints)
 -- if enable_auto_r_scale and relativeid then -- for the moment this is rather context specific (we need to hash rscale then)
 --     local relativedata = fontdata[relativeid]
 --     local rfmdata = relativedata and relativedata.unscaled and relativedata.unscaled -- just use metadata instead
 --     local id_x_height = rfmdata and rfmdata.parameters and rfmdata.parameters.x_height
 --     local tf_x_height = tfmdata and tfmdata.parameters and tfmdata.parameters.x_height
 --     if id_x_height and tf_x_height then
 --         local rscale = id_x_height/tf_x_height
 --         delta = rscale * delta
 --         scaledpoints = rscale * scaledpoints
 --     end
 -- end
    return scaledpoints, delta
end

local designsizes = constructors.designsizes

-- called quite often when in mp labels
-- otf.normalizedaxis

function constructors.hashinstance(specification,force)
    local hash      = specification.hash
    local size      = specification.size
    local fallbacks = specification.fallbacks
    if force or not hash then
        hash = constructors.hashfeatures(specification)
        specification.hash = hash
    end
    if size < 1000 and designsizes[hash] then
        size = round(constructors.scaled(size,designsizes[hash]))
        specification.size = size
    end
    if fallbacks then
        return hash .. ' @ ' .. tostring(size) .. ' @ ' .. fallbacks
    else
        local scalemode = specification.scalemode
        local special   = scalemode and specialscale[scalemode]
        if special then
            return hash .. ' @ ' .. tostring(size) .. ' @ ' .. special
        else
            return hash .. ' @ ' .. tostring(size)
        end
    end
end

-- We overload the (generic) resolver:

local resolvers    = definers.resolvers
local hashfeatures = constructors.hashfeatures

function definers.resolve(specification) -- overload function in font-con.lua
    if not specification.resolved or specification.resolved == "" then -- resolved itself not per se in mapping hash
        local r = resolvers[specification.lookup]
        if r then
            r(specification)
        end
    end
    if specification.forced == "" then
        specification.forced = nil
    else
        specification.forced = specification.forced
    end
    -- goodies are a context specific thing and are not always defined
    -- as feature, so we need to make sure we add them here before
    -- hashing because otherwise we get funny goodies applied
    local goodies = specification.goodies
    if goodies and goodies ~= "" then
        -- this adapts the features table so it has best be a copy
        local normal = specification.features.normal
        if not normal then
            specification.features.normal = { goodies = goodies }
        elseif not normal.goodies then
            local g = normal.goodies
            if g and g ~= "" then
                normal.goodies = formatters["%s,%s"](g,goodies)
            else
                normal.goodies = goodies
            end
        end
    end
    -- so far for goodie hacks
    local hash = hashfeatures(specification)
    local name = specification.name
    local sub  = specification.sub
    if sub and sub ~= "" then
        specification.hash = lower(name .. " @ " .. sub .. ' @ ' .. hash)
    else
        specification.hash = lower(name .. " @ "        .. ' @ ' .. hash)
    end
    --
    return specification
end

-- soon to be obsolete:

local mappings = fonts.mappings

local loaded = { -- prevent loading (happens in cont-sys files)
 -- ["original-base.map"     ] = true,
 -- ["original-ams-base.map" ] = true,
 -- ["original-ams-euler.map"] = true,
 -- ["original-public-lm.map"] = true,
}

function mappings.loadfile(name)
    name = file.addsuffix(name,"map")
    if not loaded[name] then
        if trace_mapfiles then
            report_mapfiles("loading map file %a",name)
        end
        pdf.mapfile(name)
        loaded[name] = true
    end
end

local loaded = { -- prevent double loading
}

function mappings.loadline(how,line)
    if line then
        how = how .. " " .. line
    elseif how == "" then
        how = "= " .. line
    end
    if not loaded[how] then
        if trace_mapfiles then
            report_mapfiles("processing map line %a",line)
        end
        pdf.mapline(how)
        loaded[how] = true
    end
end

function mappings.reset()
    pdf.mapfile("")
end

mappings.reset() -- resets the default file

implement {
    name      = "loadmapfile",
    actions   = mappings.loadfile,
    arguments = "string"
}

implement {
    name      = "loadmapline",
    actions   = mappings.loadline,
    arguments = "string"
}

implement {
    name      = "resetmapfiles",
    actions   = mappings.reset,
    arguments = "string"
}

-- we need an 'do after the banner hook'

-- => commands

local function nametoslot(name)
    local t = type(name)
    local s = nil
    if t == "string" then
        local slot = unicodes[true][name]
        if slot then
            return slot
        end
        if not aglunicodes then
            aglunicodes = encodings.agl.unicodes
        end
        slot = aglunicodes[name]
        if characters[true][slot] then
            return slot
        else
            -- not in font
        end
    elseif t == "number" then
        if characters[true][name] then
            return slot
        else
            -- not in font
        end
    end
end

local function indextoslot(index)
    local r = resources[true]
    if r then
        local indices = r.indices
        if not indices then
            indices = { }
            local c = characters[true]
            for unicode, data in next, c do
                local di = data.index
                if di then
                    indices[di] = unicode
                end
            end
            r.indices = indices
        end
        return indices[tonumber(index)]
    end
end

do -- else too many locals

    local entities = characters.entities
    local lowered  = { } -- delayed initialization

    setmetatableindex(lowered,function(t,k)
        for k, v in next, entities do
            local l = lower(k)
            if not entities[l] then
                lowered[l] = v
            end
        end
        setmetatableindex(lowered,nil)
        return lowered[k]
    end)

    local methods = {
        -- entity
        e = function(name)
                return entities[name] or lowered[name] or name
            end,
        -- hexadecimal unicode
        x = function(name)
                local n = tonumber(name,16)
                return n and utfchar(n) or name
            end,
        -- decimal unicode
        d = function(name)
                local n = tonumber(name)
                return n and utfchar(n) or name
            end,
        -- hexadecimal index (slot)
        s = function(name)
                local n = tonumber(name,16)
                local n = n and indextoslot(n)
                return n and utfchar(n) or name
            end,
        -- decimal index
        i = function(name)
                local n = tonumber(name)
                local n = n and indextoslot(n)
                return n and utfchar(n) or name
            end,
        -- name
        n = function(name)
                local n = nametoslot(name)
                return n and utfchar(n) or name
            end,
        -- char
        c = function(name)
                return name
            end,
    }

    -- -- nicer:
    --
    -- setmetatableindex(methods,function(t,k) return methods.c end)
    --
    -- local splitter = (C(1) * P(":") + Cc("c")) * C(P(1)^1) / function(method,name)
    --     return methods[method](name)
    -- end
    --
    -- -- more efficient:

    local splitter = C(1) * P(":") * C(P(1)^1) / function(method,name)
        local action = methods[method]
        return action and action(name) or name
    end

    local function tochar(str)
        local t = type(str)
        if t == "number" then
            return utfchar(str)
        elseif t == "string" then
            return lpegmatch(splitter,str) or str
        else
            return str
        end
    end

    helpers.nametoslot  = nametoslot
    helpers.indextoslot = indextoslot
    helpers.tochar      = tochar

    -- interfaces:

    implement {
        name      = "fontchar",
        actions   = { nametoslot, ctx_char },
        arguments = "string",
    }

    implement {
        name      = "fontcharbyindex",
        actions   = { indextoslot, ctx_char },
        arguments = "integer",
    }

    implement {
        name      = "tochar",
        actions   = { tochar, context },
        arguments = "string",
    }

end

-- this will change ...

function loggers.reportdefinedfonts()
    if trace_usage then
        local t, tn = { }, 0
        for id, data in sortedhash(fontdata) do
            local properties = data.properties or { }
            local parameters = data.parameters or { }
            tn = tn + 1
            t[tn] = {
  format("%03i",id                    or 0),
  format("%09i",parameters.size       or 0),
                properties.type       or "real",
                properties.format     or "unknown",
                properties.name       or "",
                properties.psname     or "",
                properties.fullname   or "",
                properties.sharedwith or "",
            }
        end
        formatcolumns(t,"  ")
        logs.pushtarget("logfile")
        report_newline()
        report_status("defined fonts:")
        report_newline()
        for k=1,tn do
            report_status(t[k])
        end
        logs.poptarget()
    end
end

luatex.registerstopactions(loggers.reportdefinedfonts)

function loggers.reportusedfeatures()
    -- numbers, setups, merged
    if trace_usage then
        local t, n = { }, #numbers
        for i=1,n do
            local name = numbers[i]
            local setup = setups[name]
            local n = setup.number
            setup.number = nil -- we have no reason to show this
            t[i] = { i, name, sequenced(setup,false,true) } -- simple mode
            setup.number = n -- restore it (normally not needed as we're done anyway)
        end
        formatcolumns(t,"  ")
        logs.pushtarget("logfile")
        report_newline()
        report_status("defined featuresets:")
        report_newline()
        for k=1,n do
            report_status(t[k])
        end
        logs.poptarget()
    end
end

luatex.registerstopactions(loggers.reportusedfeatures)

-- maybe move this to font-log.lua:

statistics.register("font engine", function()
    local elapsed   = statistics.elapsedseconds(fonts)
    local nofshared = constructors.nofsharedfonts or 0
    local nofloaded = constructors.noffontsloaded or 0
    if nofshared > 0 then
        return format("otf %0.3f, afm %0.3f, tfm %0.3f, %s instances, %s shared in backend, %s common vectors, %s common hashes, load time %s",
            otf.version,afm.version,tfm.version,nofloaded,
            nofshared,constructors.nofsharedvectors,constructors.nofsharedhashes,
            elapsed)
    elseif nofloaded > 0 and elapsed then
        return format("otf %0.3f, afm %0.3f, tfm %0.3f, %s instances, load time %s",
            otf.version,afm.version,tfm.version,nofloaded,
            elapsed)
    else
        return format("otf %0.3f, afm %0.3f, tfm %0.3f",
            otf.version,afm.version,tfm.version)
    end
end)

-- experimental mechanism for Mojca:
--
-- fonts.definetypeface {
--     name         = "mainbodyfont-light",
--     preset       = "antykwapoltawskiego-light",
-- }
--
-- fonts.definetypeface {
--     name         = "mojcasfavourite",
--     preset       = "antykwapoltawskiego",
--     normalweight = "light",
--     boldweight   = "bold",
--     width        = "condensed",
-- }

local Shapes = {
    serif = "Serif",
    sans  = "Sans",
    mono  = "Mono",
}

local ctx_startfontclass       = context.startfontclass
local ctx_stopfontclass        = context.stopfontclass
local ctx_definefontsynonym    = context.definefontsynonym
local ctx_dofastdefinetypeface = context.dofastdefinetypeface

function fonts.definetypeface(name,t)
    if type(name) == "table" then
        -- {name=abc,k=v,...}
        t = name
    elseif t then
        if type(t) == "string" then
            -- "abc", "k=v,..."
            t = settings_to_hash(name)
        else
            -- "abc", {k=v,...}
        end
        t.name = t.name or name
    else
        -- "name=abc,k=v,..."
        t = settings_to_hash(name)
    end
    local p = t.preset and fonts.typefaces[t.preset] or { }
    local name         = t.name         or "unknowntypeface"
    local shortcut     = t.shortcut     or p.shortcut or "rm"
    local size         = t.size         or p.size     or "default"
    local shape        = t.shape        or p.shape    or "serif"
    local fontname     = t.fontname     or p.fontname or "unknown"
    local normalweight = t.normalweight or t.weight or p.normalweight or p.weight or "normal"
    local boldweight   = t.boldweight   or t.weight or p.boldweight   or p.weight or "normal"
    local normalwidth  = t.normalwidth  or t.width  or p.normalwidth  or p.width  or "normal"
    local boldwidth    = t.boldwidth    or t.width  or p.boldwidth    or p.width  or "normal"
    Shape = Shapes[shape] or "Serif"
    ctx_startfontclass { name }
        ctx_definefontsynonym( { formatters["%s"]          (Shape) }, { formatters["spec:%s-%s-regular-%s"] (fontname, normalweight, normalwidth) } )
        ctx_definefontsynonym( { formatters["%sBold"]      (Shape) }, { formatters["spec:%s-%s-regular-%s"] (fontname, boldweight,   boldwidth  ) } )
        ctx_definefontsynonym( { formatters["%sBoldItalic"](Shape) }, { formatters["spec:%s-%s-italic-%s"]  (fontname, boldweight,   boldwidth  ) } )
        ctx_definefontsynonym( { formatters["%sItalic"]    (Shape) }, { formatters["spec:%s-%s-italic-%s"]  (fontname, normalweight, normalwidth) } )
    ctx_stopfontclass()
    local settings = sequenced({ features= t.features },",")
    ctx_dofastdefinetypeface(name, shortcut, shape, size, settings)
end

implement {
    name      = "definetypeface",
    actions   = fonts.definetypeface,
    arguments = { "string", "string" }
}

function fonts.current() -- todo: also handle name
    return fontdata[currentfont()] or fontdata[0]
end

function fonts.currentid()
    return currentfont() or 0
end

-- for the moment here, this will become a chain of extras that is
-- hooked into the ctx registration (or scaler or ...)

local dimenfactors = number.dimenfactors

function helpers.dimenfactor(unit,id)
    if unit == "ex" then
        return id and exheights[id] or 282460 -- lm 10pt
    elseif unit == "em" then
        return id and emwidths [id] or 655360 -- lm 10pt
    else
        local du = dimenfactors[unit]
        return du and 1/du or tonumber(unit) or 1
    end
end

local function digitwidth(font) -- max(quad/2,wd(0..9))
    local tfmdata = fontdata[font]
    local parameters = tfmdata.parameters
    local width = parameters.digitwidth
    if not width then
        width = round(parameters.quad/2) -- maybe tex.scale
        local characters = tfmdata.characters
        for i=48,57 do
            local wd = round(characters[i].width)
            if wd > width then
                width = wd
            end
        end
        parameters.digitwidth = width
    end
    return width
end

helpers.getdigitwidth = digitwidth
helpers.setdigitwidth = digitwidth

--

function helpers.getparameters(tfmdata)
    local p = { }
    local m = p
    local parameters = tfmdata.parameters
    while true do
        for k, v in next, parameters do
            m[k] = v
        end
        parameters = getmetatable(parameters)
        parameters = parameters and parameters.__index
        if type(parameters) == "table" then
            m = { }
            p.metatable = m
        else
            break
        end
    end
    return p
end

if environment.initex then

    local function names(t)
        local nt = #t
        if nt > 0 then
            local n = { }
            for i=1,nt do
                n[i] = t[i].name
            end
            return concat(n," ")
        else
            return "-"
        end
    end

    statistics.register("font processing", function()
        local l = { }
        for what, handler in table.sortedpairs(handlers) do
            local features = handler.features
            if features then
                l[#l+1] = format("[%s (base initializers: %s) (base processors: %s) (base manipulators: %s) (node initializers: %s) (node processors: %s) (node manipulators: %s)]",
                    what,
                    names(features.initializers.base),
                    names(features.processors  .base),
                    names(features.manipulators.base),
                    names(features.initializers.node),
                    names(features.processors  .node),
                    names(features.manipulators.node)
                )
            end
        end
        return concat(l, " | ")
    end)

end

-- redefinition

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

setmetatableindex(dimenfactors, function(t,k)
    if k == "ex" then
        return 1/exheights[currentfont()]
    elseif k == "em" then
        return 1/emwidths[currentfont()]
    elseif k == "pct" or k == "%" then
        return 1/(texget("hsize")/100)
    else
     -- error("wrong dimension: " .. (s or "?")) -- better a message
        return false
    end
end)

dimenfactors.ex   = nil
dimenfactors.em   = nil
dimenfactors["%"] = nil
dimenfactors.pct  = nil

--[[ldx--
<p>Before a font is passed to <l n='tex'/> we scale it. Here we also need
to scale virtual characters.</p>
--ldx]]--

-- in versions > 0.82 0 is supported as equivalent of self

function constructors.checkvirtualids(tfmdata)
    -- begin of experiment: we can use { "slot", 0, number } in virtual fonts
    local fonts  = tfmdata.fonts
    local selfid = font.nextid()
    if fonts and #fonts > 0 then
        for i=1,#fonts do
            local fi = fonts[i]
            if fi[2] == 0 then
                fi[2] = selfid
            elseif fi.id == 0 then
                fi.id = selfid
            end
        end
    else
     -- tfmdata.fonts = { "id", selfid } -- conflicts with other next id's (vf math), too late anyway
    end
    -- end of experiment
end

-- function constructors.getvirtualid(tfmdata)
--     --  since we don't know the id yet, we use 0 as signal
--     local tf = tfmdata.fonts
--     if not tf then
--         local properties = tfmdata.properties
--         if properties then
--             properties.virtualized = true
--         else
--             tfmdata.properties = { virtualized = true }
--         end
--         tf = { }
--         tfmdata.fonts = tf
--     end
--     local ntf = #tf + 1
--     tf[ntf] = { id = 0 }
--     return ntf
-- end
--
-- function constructors.checkvirtualid(tfmdata, id) -- will go
--     local properties = tfmdata.properties
--     if tfmdata and tfmdata.type == "virtual" or (properties and properties.virtualized) then
--         local vfonts = tfmdata.fonts
--         if not vffonts or #vfonts == 0 then
--             if properties then
--                 properties.virtualized = false
--             end
--             tfmdata.fonts = nil
--         else
--             for f=1,#vfonts do
--                 local fnt = vfonts[f]
--                 if fnt.id and fnt.id == 0 then
--                     fnt.id = id
--                 end
--             end
--         end
--     end
-- end

do

    local setmacro = tokens.setters.macro

    function constructors.currentfonthasfeature(n)
        local f = fontdata[currentfont()]
        if not f then return end f = f.shared
        if not f then return end f = f.rawdata
        if not f then return end f = f.resources
        if not f then return end f = f.features
        return f and (f.gpos[n] or f.gsub[n])
    end

    implement {
        name      = "doifelsecurrentfonthasfeature",
        actions   = { constructors.currentfonthasfeature, commands.doifelse },
        arguments = "string"
    }

    local f_strip  = formatters["%0.2fpt"] -- normally this value is changed only once
    local stripper = lpeg.patterns.stripzeros

    implement {
        name      = "nbfs",
        arguments = "dimen",
        actions   = function(d)
            context(lpegmatch(stripper,f_strip(d/65536)))
        end
    }

    implement {
        name      = "featureattribute",
        arguments = "string",
        actions   = { contextnumber, context }
    }

    implement {
        name      = "setfontfeature",
        arguments = "string",
        actions   = function(tag) texsetattribute(0,contextnumber(tag)) end
    }

    implement {
        name      = "resetfontfeature",
        arguments = { 0, 0 },
        actions   = texsetattribute,
    }

    implement {
        name      = "setfontofid",
        arguments = "integer",
        actions   = function(id)
            ctx_getvalue(csnames[id])
        end
    }

    implement {
        name      = "definefontfeature",
        arguments = { "string", "string", "string" },
        actions   = presetcontext
    }

    implement {
        name      = "adaptfontfeature",
        arguments = { "string", "string" },
        actions   = adaptcontext
    }

    local cache = { }

    local hows = {
        ["+"] = "add",
        ["-"] = "subtract",
        ["="] = "replace",
    }

    local function setfeature(how,parent,name,font) -- 0/1 test temporary for testing
        if not how or how == 0 then
            if trace_features and texgetattribute(0) ~= 0 then
                report_cummulative("font %!font:name!, reset",fontdata[font or true])
            end
            texsetattribute(0,0)
        elseif how == true or how == 1 then
            local hash = "feature > " .. parent
            local done = cache[hash]
            if trace_features and done then
                report_cummulative("font %!font:name!, revive %a : %!font:features!",fontdata[font or true],parent,setups[numbers[done]])
            end
            texsetattribute(0,done or 0)
        else
            local full = parent .. how .. name
            local hash = "feature > " .. full
            local done = cache[hash]
            if not done then
                local n = setups[full]
                if n then
                    -- already defined
                else
                    n = mergecontextfeatures(parent,name,how,full)
                end
                done = registercontextfeature(hash,full,how)
                cache[hash] = done
                if trace_features then
                    report_cummulative("font %!font:name!, %s %a : %!font:features!",fontdata[font or true],hows[how],full,setups[numbers[done]])
                end
            end
            texsetattribute(0,done)
        end
    end

    local function resetfeature()
        if trace_features and texgetattribute(0) ~= 0 then
            report_cummulative("font %!font:name!, reset",fontdata[true])
        end
        texsetattribute(0,0)
    end

    local function registerlanguagefeatures()
        local specifications = languages.data.specifications
        for i=1,#specifications do
            local specification = specifications[i]
            local language = specification.opentype
            if language then
                local script = specification.opentypescript or specification.script
                if script then
                    local context = specification.context
                    if type(context) == "table" then
                        for i=1,#context do
                            definecontext(context[i], { language = language, script = script})
                        end
                    elseif type(context) == "string" then
                       definecontext(context, { language = language, script = script})
                    end
                end
            end
        end
    end

    constructors.setfeature   = setfeature
    constructors.resetfeature = resetfeature

    implement { name = "resetfeature",    actions = resetfeature }
    implement { name = "addfeature",      actions = setfeature, arguments = { "'+'",  "string", "string" } }
    implement { name = "subtractfeature", actions = setfeature, arguments = { "'-'",  "string", "string" } }
    implement { name = "replacefeature",  actions = setfeature, arguments = { "'='",  "string", "string" } }
    implement { name = "revivefeature",   actions = setfeature, arguments = { true, "string" } }

    implement {
        name      = "featurelist",
        actions   = { fonts.specifiers.contexttostring, context },
        arguments = { "string", "'otf'", "string", "'yes'", "'no'", true }
    }

    implement {
        name    = "registerlanguagefeatures",
        actions = registerlanguagefeatures,
    }

end

-- a fontkern plug:

do

    local kerncodes = nodes.kerncodes
    local copy_node = nuts.copy
    local kern      = nuts.pool.register(nuts.pool.kern())

    setattr(kern,attributes.private('fontkern'),1) -- no gain in setprop as it's shared

    nodes.injections.installnewkern(function(k)
        local c = copy_node(kern)
        setfield(c,"kern",k)
        return c
    end)

    directives.register("fonts.injections.fontkern", function(v)
        setsubtype(kern,v and kerncodes.fontkern or kerncodes.userkern)
    end)

end

do

    local report = logs.reporter("otf","variants")

    local function replace(tfmdata,feature,value)
        local characters = tfmdata.characters
        local variants   = tfmdata.resources.variants
        if variants then
            local t = { }
            for k, v in sortedhash(variants) do
                t[#t+1] = formatters["0x%X (%i)"](k,k)
            end
            value = tonumber(value) or 0xFE00 -- 917762
            report("fontname : %s",tfmdata.properties.fontname)
            report("available: % t",t)
            local v = variants[value]
            if v then
                report("using    : %X (%i)",value,value)
                for k, v in next, v do
                    local c = characters[v]
                    if c then
                        characters[k] = c
                    end
                end
            else
                report("unknown  : %X (%i)",value,value)
            end
        end
    end

    registerotffeature {
        name         = 'variant',
        description  = 'unicode variant',
        manipulators = {
            base = replace,
            node = replace,
        }
    }

end

-- here (todo: closure)

-- make a closure (200 limit):

do

    local trace_analyzing = false  trackers.register("otf.analyzing", function(v) trace_analyzing = v end)

    local analyzers       = fonts.analyzers
    local methods         = analyzers.methods

    local unsetvalue      = attributes.unsetvalue

    local traverse_id     = nuts.traverse_id

    local a_color         = attributes.private('color')
    local a_colormodel    = attributes.private('colormodel')
    local a_state         = attributes.private('state')
    local m_color         = attributes.list[a_color] or { }

    local glyph_code      = nodes.nodecodes.glyph

    local states          = analyzers.states

    local colornames = {
        [states.init] = "font:1",
        [states.medi] = "font:2",
        [states.fina] = "font:3",
        [states.isol] = "font:4",
        [states.mark] = "font:5",
        [states.rest] = "font:6",
        [states.rphf] = "font:1",
        [states.half] = "font:2",
        [states.pref] = "font:3",
        [states.blwf] = "font:4",
        [states.pstf] = "font:5",
    }

    local function markstates(head)
        if head then
            head = tonut(head)
            local model = getattr(head,a_colormodel) or 1
            for glyph in traverse_id(glyph_code,head) do
                local a = getprop(glyph,a_state)
                if a then
                    local name = colornames[a]
                    if name then
                        local color = m_color[name]
                        if color then
                            setattr(glyph,a_colormodel,model)
                            setattr(glyph,a_color,color)
                        end
                    end
                end
            end
        end
    end

    local function analyzeprocessor(head,font,attr)
        local tfmdata = fontdata[font]
        local script, language = otf.scriptandlanguage(tfmdata,attr)
        local action = methods[script]
        if not action then
            return head, false
        end
        if type(action) == "function" then
            local head, done = action(head,font,attr)
            if done and trace_analyzing then
                markstates(head)
            end
            return head, done
        end
        action = action[language]
        if action then
            local head, done = action(head,font,attr)
            if done and trace_analyzing then
                markstates(head)
            end
            return head, done
        else
            return head, false
        end
    end

    registerotffeature { -- adapts
        name       = "analyze",
        processors = {
            node     = analyzeprocessor,
        }
    }


    function methods.nocolor(head,font,attr)
        for n in traverse_id(glyph_code,head) do
            if not font or getfont(n) == font then
                setattr(n,a_color,unsetvalue)
            end
        end
        return head, true
    end

end


local function purefontname(name)
    if type(name) == "number" then
        name = getfontname(name)
    end
    if type(name) == "string" then
       return basename(name)
    end
end

implement {
    name      = "purefontname",
    actions   = { purefontname, context },
    arguments = "string",
}

local list = storage.shared.bodyfontsizes or { }

storage.shared.bodyfontsizes = list

implement {
    name      = "registerbodyfontsize",
    arguments = "string",
    actions   = function(size)
        list[size] = true
    end
}

implement {
    name      = "getbodyfontsizes",
    arguments = "string",
    actions   = function(separator)
        context(concat(sortedkeys(list),separator))
    end
}

implement {
    name      = "processbodyfontsizes",
    arguments = "string",
    actions   = function(command)
        local keys = sortedkeys(list)
        if command then
            local action = context[command]
            for i=1,#keys do
                action(keys[i])
            end
        else
            context(concat(keys,","))
        end
    end
}

implement {
    name      = "cleanfontname",
    actions   = { cleanname, context },
    arguments = "string"
}

implement {
    name      = "fontlookupinitialize",
    actions   = names.lookup,
    arguments = "string",
}

implement {
    name      = "fontlookupnoffound",
    actions   = { names.noflookups, context },
}

implement {
    name      = "fontlookupgetkeyofindex",
    actions   = { names.getlookupkey, context },
    arguments = { "string", "integer"}
}

implement {
    name      = "fontlookupgetkey",
    actions   = { names.getlookupkey, context },
    arguments = "string"
}

-- this might move to a runtime module:

function commands.showchardata(n)
    local tfmdata = fontdata[currentfont()]
    if tfmdata then
        if type(n) == "string" then
            n = utfbyte(n)
        end
        local chr = tfmdata.characters[n]
        if chr then
            report_status("%s @ %s => %U => %c => %s",tfmdata.properties.fullname,tfmdata.parameters.size,n,n,serialize(chr,false))
        end
    end
end

function commands.showfontparameters(tfmdata)
    -- this will become more clever
    local tfmdata = tfmdata or fontdata[currentfont()]
    if tfmdata then
        local parameters        = tfmdata.parameters
        local mathparameters    = tfmdata.mathparameters
        local properties        = tfmdata.properties
        local hasparameters     = parameters     and next(parameters)
        local hasmathparameters = mathparameters and next(mathparameters)
        if hasparameters then
            report_status("%s @ %s => text parameters => %s",properties.fullname,parameters.size,serialize(parameters,false))
        end
        if hasmathparameters then
            report_status("%s @ %s => math parameters => %s",properties.fullname,parameters.size,serialize(mathparameters,false))
        end
        if not hasparameters and not hasmathparameters then
            report_status("%s @ %s => no text parameters and/or math parameters",properties.fullname,parameters.size)
        end
    end
end

implement {
    name    = "currentdesignsize",
    actions = function()
        context(parameters[currentfont()].designsize)
    end
}

implement {
    name      = "doifelsefontpresent",
    actions   = { names.exists, commands.doifelse },
    arguments = "string"
}

-- we use 0xFE000+ and 0xFF000+ in math and for runtime (text) extensions we
-- use 0xFD000+

constructors.privateslots = constructors.privateslots or { }

storage.register("fonts/constructors/privateslots", constructors.privateslots, "fonts.constructors.privateslots")

do

    local privateslots    = constructors.privateslots
    local lastprivateslot = 0xFD000

    constructors.privateslots = setmetatableindex(privateslots,function(t,k)
        local v = lastprivateslot
        lastprivateslot = lastprivateslot + 1
        t[k] = v
        return v
    end)

    implement {
        name      = "getprivateglyphslot",
        actions   = function(name) context(privateslots[name]) end,
        arguments = "string",
    }

end

-- an extra helper

function helpers.getcoloredglyphs(tfmdata)
    if type(tfmdata) == "number" then
        tfmdata = fontdata[tfmdata]
    end
    if not tfmdata then
        tfmdata = fontdata[true]
    end
    local characters   = tfmdata.characters
    local descriptions = tfmdata.descriptions
    local collected    = { }
    for unicode, character in next, characters do
        local description = descriptions[unicode]
        if description and (description.colors or character.svg) then
            collected[#collected+1] = unicode
        end
    end
    table.sort(collected)
    return collected
end

-- for the font manual

statistics.register("used fonts",function()
    if trace_usage then
        local filename = file.nameonly(environment.jobname) .. "-fonts-usage.lua"
        if next(fontdata) then
            local files = { }
            local list  = { }
            for id, tfmdata in sortedhash(fontdata) do
                local filename = tfmdata.properties.filename
                if filename then
                    local filedata = files[filename]
                    if filedata then
                        filedata.instances = filedata.instances + 1
                    else
                        local rawdata  = tfmdata.shared and tfmdata.shared.rawdata
                        local metadata = rawdata and rawdata.metadata
                        files[filename] = {
                            instances = 1,
                            filename  = filename,
                            version   = metadata and metadata.version,
                            size      = rawdata and rawdata.size,
                        }
                    end
                else
                    -- what to do
                end
            end
            for k, v in sortedhash(files) do
                list[#list+1] = v
            end
            table.save(filename,list)
        else
            os.remove(filename)
        end
    end
end)

-- new

do

    local settings_to_array    = utilities.parsers.settings_to_array
    local namedcolorattributes = attributes.colors.namedcolorattributes
    local colorvalues          = attributes.colors.values

    implement {
        name      = "definefontcolorpalette",
        arguments = { "string", "string" },
        actions   = function(name,set)
            set = settings_to_array(set)
            for i=1,#set do
                local name = set[i]
                local space, color = namedcolorattributes(name)
                local values = colorvalues[color]
                if values then
                    set[i] = { r = values[3], g = values[4],  b = values[5] }
                else
                    set[i] = { r = 0, g = 0, b = 0 }
                end
            end
            otf.registerpalette(name,set)
        end
    }

end

do

    local pattern = C((1-S("* "))^1) -- strips all after * or ' at'

    implement {
        name      = "truefontname",
        arguments = "string",
        actions   = function(s)
         -- context(match(s,"[^* ]+") or s)
            context(lpegmatch(pattern,s) or s)
        end
    }

end

do

    local function getinstancespec(id)
        local data      = fontdata[id or true]
        local shared    = data.shared
        local resources = shared and shared.rawdata.resources
        if resources then
            local instancespec = data.properties.instance
            if instancespec then
                local variabledata = resources.variabledata
                if variabledata then
                    local instances = variabledata.instances
                    if instances then
                        for i=1,#instances do
                            local instance = instances[i]
                            if cleanname(instance.subfamily)== instancespec then
                                local values = table.copy(instance.values)
                                local axis = variabledata.axis
                                for i=1,#values do
                                    for j=1,#axis do
                                        if values[i].axis == axis[j].tag then
                                            values[i].name = axis[j].name
                                            break
                                        end
                                    end
                                end
                                return values
                            end
                        end
                    end
                end
            end
        end
    end

    helpers.getinstancespec = getinstancespec

    implement {
        name      = "currentfontinstancespec",
        actions   = function()
            local t = getinstancespec() -- current font
            if t then
                for i=1,#t do
                    if i > 1 then
                        context.space()
                    end
                    local ti = t[i]
                    context("%s=%s",ti.name,ti.value)
                end
            end
        end
    }

end