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
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
|
if not modules then modules = { } end modules ['font-otn'] = {
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",
}
-- this is a context version which can contain experimental code, but when we
-- have serious patches we also need to change the other two font-otn files
-- at some point i might decide to convert the whole list into a table and then
-- run over that instead (but it has some drawbacks as we also need to deal with
-- attributes and such so we need to keep a lot of track - which is why i rejected
-- that method - although it has become a bit easier in the meantime so it might
-- become an alternative (by that time i probably have gone completely lua) .. the
-- usual chicken-egg issues ... maybe mkix as it's no real tex any more then
-- preprocessors = { "nodes" }
-- anchor class : mark, mkmk, curs, mklg (todo)
-- anchor type : mark, basechar, baselig, basemark, centry, cexit, max (todo)
-- this is still somewhat preliminary and it will get better in due time;
-- much functionality could only be implemented thanks to the husayni font
-- of Idris Samawi Hamid to who we dedicate this module.
-- in retrospect it always looks easy but believe it or not, it took a lot
-- of work to get proper open type support done: buggy fonts, fuzzy specs,
-- special made testfonts, many skype sessions between taco, idris and me,
-- torture tests etc etc ... unfortunately the code does not show how much
-- time it took ...
-- todo:
--
-- extension infrastructure (for usage out of context)
-- sorting features according to vendors/renderers
-- alternative loop quitters
-- check cursive and r2l
-- find out where ignore-mark-classes went
-- default features (per language, script)
-- handle positions (we need example fonts)
-- handle gpos_single (we might want an extra width field in glyph nodes because adding kerns might interfere)
-- mark (to mark) code is still not what it should be (too messy but we need some more extreem husayni tests)
-- remove some optimizations (when I have a faster machine)
--
-- beware:
--
-- we do some disc jugling where we need to keep in mind that the
-- pre, post and replace fields can have prev pointers to a nesting
-- node ... i wonder if that is still needed
--
-- not possible:
--
-- \discretionary {alpha-} {betagammadelta}
-- {\discretionary {alphabeta-} {gammadelta}
-- {\discretionary {alphabetagamma-} {delta}
-- {alphabetagammadelta}}}
--[[ldx--
<p>This module is a bit more split up that I'd like but since we also want to test
with plain <l n='tex'/> it has to be so. This module is part of <l n='context'/>
and discussion about improvements and functionality mostly happens on the
<l n='context'/> mailing list.</p>
<p>The specification of OpenType is kind of vague. Apart from a lack of a proper
free specifications there's also the problem that Microsoft and Adobe
may have their own interpretation of how and in what order to apply features.
In general the Microsoft website has more detailed specifications and is a
better reference. There is also some information in the FontForge help files.</p>
<p>Because there is so much possible, fonts might contain bugs and/or be made to
work with certain rederers. These may evolve over time which may have the side
effect that suddenly fonts behave differently.</p>
<p>After a lot of experiments (mostly by Taco, me and Idris) we're now at yet another
implementation. Of course all errors are mine and of course the code can be
improved. There are quite some optimizations going on here and processing speed
is currently acceptable. Not all functions are implemented yet, often because I
lack the fonts for testing. Many scripts are not yet supported either, but I will
look into them as soon as <l n='context'/> users ask for it.</p>
<p>The specification leaves room for interpretation. In case of doubt the microsoft
implementation is the reference as it is the most complete one. As they deal with
lots of scripts and fonts, Kai and Ivo did a lot of testing of the generic code and
their suggestions help improve the code. I'm aware that not all border cases can be
taken care of, unless we accept excessive runtime, and even then the interference
with other mechanisms (like hyphenation) are not trivial.</p>
<p>Glyphs are indexed not by unicode but in their own way. This is because there is no
relationship with unicode at all, apart from the fact that a font might cover certain
ranges of characters. One character can have multiple shapes. However, at the
<l n='tex'/> end we use unicode so and all extra glyphs are mapped into a private
space. This is needed because we need to access them and <l n='tex'/> has to include
then in the output eventually.</p>
<p>The raw table as it coms from <l n='fontforge'/> gets reorganized in to fit out needs.
In <l n='context'/> that table is packed (similar tables are shared) and cached on disk
so that successive runs can use the optimized table (after loading the table is
unpacked). The flattening code used later is a prelude to an even more compact table
format (and as such it keeps evolving).</p>
<p>This module is sparsely documented because it is a moving target. The table format
of the reader changes and we experiment a lot with different methods for supporting
features.</p>
<p>As with the <l n='afm'/> code, we may decide to store more information in the
<l n='otf'/> table.</p>
<p>Incrementing the version number will force a re-cache. We jump the number by one
when there's a fix in the <l n='fontforge'/> library or <l n='lua'/> code that
results in different tables.</p>
--ldx]]--
-- action handler chainproc
--
-- gsub_single ok ok
-- gsub_multiple ok ok
-- gsub_alternate ok ok
-- gsub_ligature ok ok
-- gsub_context ok --
-- gsub_contextchain ok --
-- gsub_reversecontextchain ok --
-- chainsub -- ok
-- reversesub -- ok
-- gpos_mark2base ok ok
-- gpos_mark2ligature ok ok
-- gpos_mark2mark ok ok
-- gpos_cursive ok untested
-- gpos_single ok ok
-- gpos_pair ok ok
-- gpos_context ok --
-- gpos_contextchain ok --
--
-- todo: contextpos
--
-- actions:
--
-- handler : actions triggered by lookup
-- chainproc : actions triggered by contextual lookup
-- chainmore : multiple substitutions triggered by contextual lookup (e.g. fij -> f + ij)
--
-- remark: the 'not implemented yet' variants will be done when we have fonts that use them
-- We used to have independent hashes for lookups but as the tags are unique
-- we now use only one hash. If needed we can have multiple again but in that
-- case I will probably prefix (i.e. rename) the lookups in the cached font file.
-- Todo: make plugin feature that operates on char/glyphnode arrays
local type, next, tonumber = type, next, tonumber
local random = math.random
local formatters = string.formatters
local logs, trackers, nodes, attributes = logs, trackers, nodes, attributes
local registertracker = trackers.register
local registerdirective = directives.register
local fonts = fonts
local otf = fonts.handlers.otf
local trace_lookups = false registertracker("otf.lookups", function(v) trace_lookups = v end)
local trace_singles = false registertracker("otf.singles", function(v) trace_singles = v end)
local trace_multiples = false registertracker("otf.multiples", function(v) trace_multiples = v end)
local trace_alternatives = false registertracker("otf.alternatives", function(v) trace_alternatives = v end)
local trace_ligatures = false registertracker("otf.ligatures", function(v) trace_ligatures = v end)
local trace_contexts = false registertracker("otf.contexts", function(v) trace_contexts = v end)
local trace_marks = false registertracker("otf.marks", function(v) trace_marks = v end)
local trace_kerns = false registertracker("otf.kerns", function(v) trace_kerns = v end)
local trace_cursive = false registertracker("otf.cursive", function(v) trace_cursive = v end)
local trace_preparing = false registertracker("otf.preparing", function(v) trace_preparing = v end)
local trace_bugs = false registertracker("otf.bugs", function(v) trace_bugs = v end)
local trace_details = false registertracker("otf.details", function(v) trace_details = v end)
local trace_applied = false registertracker("otf.applied", function(v) trace_applied = v end)
local trace_steps = false registertracker("otf.steps", function(v) trace_steps = v end)
local trace_skips = false registertracker("otf.skips", function(v) trace_skips = v end)
local trace_directions = false registertracker("otf.directions", function(v) trace_directions = v end)
local trace_kernruns = false registertracker("otf.kernruns", function(v) trace_kernruns = v end)
local trace_discruns = false registertracker("otf.discruns", function(v) trace_discruns = v end)
local trace_compruns = false registertracker("otf.compruns", function(v) trace_compruns = v end)
local quit_on_no_replacement = true -- maybe per font
local zwnjruns = true
registerdirective("otf.zwnjruns", function(v) zwnjruns = v end)
registerdirective("otf.chain.quitonnoreplacement",function(value) quit_on_no_replacement = value end)
local report_direct = logs.reporter("fonts","otf direct")
local report_subchain = logs.reporter("fonts","otf subchain")
local report_chain = logs.reporter("fonts","otf chain")
local report_process = logs.reporter("fonts","otf process")
local report_prepare = logs.reporter("fonts","otf prepare")
local report_warning = logs.reporter("fonts","otf warning")
local report_run = logs.reporter("fonts","otf run")
registertracker("otf.verbose_chain", function(v) otf.setcontextchain(v and "verbose") end)
registertracker("otf.normal_chain", function(v) otf.setcontextchain(v and "normal") end)
registertracker("otf.replacements", "otf.singles,otf.multiples,otf.alternatives,otf.ligatures")
registertracker("otf.positions","otf.marks,otf.kerns,otf.cursive")
registertracker("otf.actions","otf.replacements,otf.positions")
registertracker("otf.injections","nodes.injections")
registertracker("*otf.sample","otf.steps,otf.actions,otf.analyzing")
local nuts = nodes.nuts
local tonode = nuts.tonode
local tonut = nuts.tonut
local getfield = nuts.getfield
local setfield = nuts.setfield
local getnext = nuts.getnext
local setnext = nuts.setnext
local getprev = nuts.getprev
local setprev = nuts.setprev
local getid = nuts.getid
local getattr = nuts.getattr
local setattr = nuts.setattr
local getprop = nuts.getprop
local setprop = nuts.setprop
local getfont = nuts.getfont
local getsubtype = nuts.getsubtype
local setsubtype = nuts.setsubtype
local getchar = nuts.getchar
local setchar = nuts.setchar
local insert_node_before = nuts.insert_before
local insert_node_after = nuts.insert_after
local delete_node = nuts.delete
local remove_node = nuts.remove
local copy_node = nuts.copy
local copy_node_list = nuts.copy_list
local find_node_tail = nuts.tail
local flush_node_list = nuts.flush_list
local free_node = nuts.free
local end_of_math = nuts.end_of_math
local traverse_nodes = nuts.traverse
local traverse_id = nuts.traverse_id
local setmetatableindex = table.setmetatableindex
local zwnj = 0x200C
local zwj = 0x200D
local wildcard = "*"
local default = "dflt"
local nodecodes = nodes.nodecodes
local glyphcodes = nodes.glyphcodes
local disccodes = nodes.disccodes
local glyph_code = nodecodes.glyph
local glue_code = nodecodes.glue
local disc_code = nodecodes.disc
local math_code = nodecodes.math
local dir_code = nodecodes.dir
local localpar_code = nodecodes.localpar
local discretionary_code = disccodes.discretionary
local ligature_code = glyphcodes.ligature
local privateattribute = attributes.private
-- Something is messed up: we have two mark / ligature indices, one at the injection
-- end and one here ... this is based on KE's patches but there is something fishy
-- there as I'm pretty sure that for husayni we need some connection (as it's much
-- more complex than an average font) but I need proper examples of all cases, not
-- of only some.
local a_state = privateattribute('state')
local a_cursbase = privateattribute('cursbase') -- to be checked, probably can go
local injections = nodes.injections
local setmark = injections.setmark
local setcursive = injections.setcursive
local setkern = injections.setkern
local setpair = injections.setpair
local resetinjection = injections.reset
local copyinjection = injections.copy
local setligaindex = injections.setligaindex
local getligaindex = injections.getligaindex
local cursonce = true
local fonthashes = fonts.hashes
local fontdata = fonthashes.identifiers
local otffeatures = fonts.constructors.newfeatures("otf")
local registerotffeature = otffeatures.register
local onetimemessage = fonts.loggers.onetimemessage or function() end
otf.defaultnodealternate = "none" -- first last
-- we share some vars here, after all, we have no nested lookups and less code
local tfmdata = false
local characters = false
local descriptions = false
local resources = false
local marks = false
local currentfont = false
local lookuptable = false
local anchorlookups = false
local lookuptypes = false
local lookuptags = false
local handlers = { }
local rlmode = 0
local featurevalue = false
local sweephead = { }
local sweepnode = nil
local sweepprev = nil
local sweepnext = nil
local notmatchpre = { }
local notmatchpost = { }
local notmatchreplace = { }
-- we use this for special testing and documentation
local checkstep = (nodes and nodes.tracers and nodes.tracers.steppers.check) or function() end
local registerstep = (nodes and nodes.tracers and nodes.tracers.steppers.register) or function() end
local registermessage = (nodes and nodes.tracers and nodes.tracers.steppers.message) or function() end
local function logprocess(...)
if trace_steps then
registermessage(...)
end
report_direct(...)
end
local function logwarning(...)
report_direct(...)
end
local f_unicode = formatters["%U"]
local f_uniname = formatters["%U (%s)"]
local f_unilist = formatters["% t (% t)"]
local function gref(n) -- currently the same as in font-otb
if type(n) == "number" then
local description = descriptions[n]
local name = description and description.name
if name then
return f_uniname(n,name)
else
return f_unicode(n)
end
elseif n then
local num, nam = { }, { }
for i=1,#n do
local ni = n[i]
if tonumber(ni) then -- later we will start at 2
local di = descriptions[ni]
num[i] = f_unicode(ni)
nam[i] = di and di.name or "-"
end
end
return f_unilist(num,nam)
else
return "<error in node mode tracing>"
end
end
local function cref(kind,chainname,chainlookupname,lookupname,index) -- not in the mood to alias f_
if index then
return formatters["feature %a, chain %a, sub %a, lookup %a, index %a"](kind,chainname,chainlookupname,lookuptags[lookupname],index)
elseif lookupname then
return formatters["feature %a, chain %a, sub %a, lookup %a"](kind,chainname,chainlookupname,lookuptags[lookupname])
elseif chainlookupname then
return formatters["feature %a, chain %a, sub %a"](kind,lookuptags[chainname],lookuptags[chainlookupname])
elseif chainname then
return formatters["feature %a, chain %a"](kind,lookuptags[chainname])
else
return formatters["feature %a"](kind)
end
end
local function pref(kind,lookupname)
return formatters["feature %a, lookup %a"](kind,lookuptags[lookupname])
end
-- We can assume that languages that use marks are not hyphenated. We can also assume
-- that at most one discretionary is present.
-- We do need components in funny kerning mode but maybe I can better reconstruct then
-- as we do have the font components info available; removing components makes the
-- previous code much simpler. Also, later on copying and freeing becomes easier.
-- However, for arabic we need to keep them around for the sake of mark placement
-- and indices.
local function copy_glyph(g) -- next and prev are untouched !
local components = getfield(g,"components")
if components then
setfield(g,"components",nil)
local n = copy_node(g)
copyinjection(n,g) -- we need to preserve the lig indices
setfield(g,"components",components)
return n
else
local n = copy_node(g)
copyinjection(n,g) -- we need to preserve the lig indices
return n
end
end
local function flattendisk(head,disc)
local replace = getfield(disc,"replace")
setfield(disc,"replace",nil)
free_node(disc)
if head == disc then
local next = getnext(disc)
if replace then
if next then
local tail = find_node_tail(replace)
setnext(tail,next)
setprev(next,tail)
end
return replace, replace
elseif next then
return next, next
else
return -- maybe warning
end
else
local next = getnext(disc)
local prev = getprev(disc)
if replace then
local tail = find_node_tail(replace)
if next then
setnext(tail,next)
setprev(next,tail)
end
setnext(prev,replace)
setprev(replace,prev)
return head, replace
else
if next then
setprev(next,prev)
end
setnext(prev,next)
return head, next
end
end
end
local function appenddisc(disc,list)
local post = getfield(disc,"post")
local replace = getfield(disc,"replace")
local phead = list
local rhead = copy_node_list(list)
local ptail = find_node_tail(post)
local rtail = find_node_tail(replace)
if post then
setnext(ptail,phead)
setprev(phead,ptail)
else
setfield(disc,"post",phead)
end
if replace then
setnext(rtail,rhead)
setprev(rhead,rtail)
else
setfield(disc,"replace",rhead)
end
end
-- start is a mark and we need to keep that one
local function markstoligature(kind,lookupname,head,start,stop,char)
if start == stop and getchar(start) == char then
return head, start
else
local prev = getprev(start)
local next = getnext(stop)
setprev(start,nil)
setnext(stop,nil)
local base = copy_glyph(start)
if head == start then
head = base
end
resetinjection(base)
setchar(base,char)
setsubtype(base,ligature_code)
setfield(base,"components",start)
if prev then
setnext(prev,base)
end
if next then
setprev(next,base)
end
setnext(base,next)
setprev(base,prev)
return head, base
end
end
-- The next code is somewhat complicated by the fact that some fonts can have ligatures made
-- from ligatures that themselves have marks. This was identified by Kai in for instance
-- arabtype: KAF LAM SHADDA ALEF FATHA (0x0643 0x0644 0x0651 0x0627 0x064E). This becomes
-- KAF LAM-ALEF with a SHADDA on the first and a FATHA op de second component. In a next
-- iteration this becomes a KAF-LAM-ALEF with a SHADDA on the second and a FATHA on the
-- third component.
local function getcomponentindex(start) -- we could store this offset in the glyph (nofcomponents)
if getid(start) ~= glyph_code then -- and then get rid of all components
return 0
elseif getsubtype(start) == ligature_code then
local i = 0
local components = getfield(start,"components")
while components do
i = i + getcomponentindex(components)
components = getnext(components)
end
return i
elseif not marks[getchar(start)] then
return 1
else
return 0
end
end
local a_noligature = attributes.private("noligature")
local function toligature(kind,lookupname,head,start,stop,char,markflag,discfound) -- brr head
if getattr(start,a_noligature) == 1 then
-- so we can do: e\noligature{ff}e e\noligature{f}fie (we only look at the first)
return head, start
end
if start == stop and getchar(start) == char then
resetinjection(start)
setchar(start,char)
return head, start
end
-- needs testing (side effects):
local components = getfield(start,"components")
if components then
-- we get a double free .. needs checking
-- flush_node_list(components)
end
--
local prev = getprev(start)
local next = getnext(stop)
local comp = start
setprev(start,nil)
setnext(stop,nil)
local base = copy_glyph(start)
if start == head then
head = base
end
resetinjection(base)
setchar(base,char)
setsubtype(base,ligature_code)
setfield(base,"components",comp) -- start can have components ... do we need to flush?
if prev then
setnext(prev,base)
end
if next then
setprev(next,base)
end
setprev(base,prev)
setnext(base,next)
if not discfound then
local deletemarks = markflag ~= "mark"
local components = start
local baseindex = 0
local componentindex = 0
local head = base
local current = base
-- first we loop over the glyphs in start .. stop
while start do
local char = getchar(start)
if not marks[char] then
baseindex = baseindex + componentindex
componentindex = getcomponentindex(start)
elseif not deletemarks then -- quite fishy
setligaindex(start,baseindex + getligaindex(start,componentindex))
if trace_marks then
logwarning("%s: keep mark %s, gets index %s",pref(kind,lookupname),gref(char),getligaindex(start))
end
local n = copy_node(start)
copyinjection(n,start)
head, current = insert_node_after(head,current,n) -- unlikely that mark has components
elseif trace_marks then
logwarning("%s: delete mark %s",pref(kind,lookupname),gref(char))
end
start = getnext(start)
end
-- we can have one accent as part of a lookup and another following
-- local start = components -- was wrong (component scanning was introduced when more complex ligs in devanagari was added)
local start = getnext(current)
while start and getid(start) == glyph_code do
local char = getchar(start)
if marks[char] then
setligaindex(start,baseindex + getligaindex(start,componentindex))
if trace_marks then
logwarning("%s: set mark %s, gets index %s",pref(kind,lookupname),gref(char),getligaindex(start))
end
else
break
end
start = getnext(start)
end
else
-- discfound ... forget about marks .. probably no scripts that hyphenate and have marks
local discprev = getprev(discfound)
local discnext = getnext(discfound)
if discprev and discnext then
-- we assume normalization in context, and don't care about generic ... especially
-- \- can give problems as there we can have a negative char but that won't match
-- anyway
local pre = getfield(discfound,"pre")
local post = getfield(discfound,"post")
local replace = getfield(discfound,"replace")
if not replace then -- todo: signal simple hyphen
local prev = getprev(base)
local copied = copy_node_list(comp)
setprev(discnext,nil) -- also blocks funny assignments
setnext(discprev,nil) -- also blocks funny assignments
if pre then
setnext(discprev,pre)
setprev(pre,discprev)
end
pre = comp
if post then
local tail = find_node_tail(post)
setnext(tail,discnext)
setprev(discnext,tail)
setprev(post,nil)
else
post = discnext
end
setnext(prev,discfound)
setprev(discfound,prev)
setnext(discfound,next)
setprev(next,discfound)
setnext(base,nil)
setprev(base,nil)
setfield(base,"components",copied)
setfield(discfound,"pre",pre)
setfield(discfound,"post",post)
setfield(discfound,"replace",base)
setsubtype(discfound,discretionary_code)
base = prev -- restart
end
end
end
return head, base
end
local function multiple_glyphs(head,start,multiple,ignoremarks)
local nofmultiples = #multiple
if nofmultiples > 0 then
resetinjection(start)
setchar(start,multiple[1])
if nofmultiples > 1 then
local sn = getnext(start)
for k=2,nofmultiples do -- todo: use insert_node
-- untested:
--
-- while ignoremarks and marks[getchar(sn)] then
-- local sn = getnext(sn)
-- end
local n = copy_node(start) -- ignore components
resetinjection(n)
setchar(n,multiple[k])
setprev(n,start)
setnext(n,sn)
if sn then
setprev(sn,n)
end
setnext(start,n)
start = n
end
end
return head, start, true
else
if trace_multiples then
logprocess("no multiple for %s",gref(getchar(start)))
end
return head, start, false
end
end
local function get_alternative_glyph(start,alternatives,value,trace_alternatives)
local n = #alternatives
if value == "random" then
local r = random(1,n)
return alternatives[r], trace_alternatives and formatters["value %a, taking %a"](value,r)
elseif value == "first" then
return alternatives[1], trace_alternatives and formatters["value %a, taking %a"](value,1)
elseif value == "last" then
return alternatives[n], trace_alternatives and formatters["value %a, taking %a"](value,n)
else
value = tonumber(value)
if type(value) ~= "number" then
return alternatives[1], trace_alternatives and formatters["invalid value %s, taking %a"](value,1)
elseif value > n then
local defaultalt = otf.defaultnodealternate
if defaultalt == "first" then
return alternatives[n], trace_alternatives and formatters["invalid value %s, taking %a"](value,1)
elseif defaultalt == "last" then
return alternatives[1], trace_alternatives and formatters["invalid value %s, taking %a"](value,n)
else
return false, trace_alternatives and formatters["invalid value %a, %s"](value,"out of range")
end
elseif value == 0 then
return getchar(start), trace_alternatives and formatters["invalid value %a, %s"](value,"no change")
elseif value < 1 then
return alternatives[1], trace_alternatives and formatters["invalid value %a, taking %a"](value,1)
else
return alternatives[value], trace_alternatives and formatters["value %a, taking %a"](value,value)
end
end
end
-- handlers
function handlers.gsub_single(head,start,kind,lookupname,replacement)
if trace_singles then
logprocess("%s: replacing %s by single %s",pref(kind,lookupname),gref(getchar(start)),gref(replacement))
end
resetinjection(start)
setchar(start,replacement)
return head, start, true
end
function handlers.gsub_alternate(head,start,kind,lookupname,alternative,sequence)
local value = featurevalue == true and tfmdata.shared.features[kind] or featurevalue
local choice, comment = get_alternative_glyph(start,alternative,value,trace_alternatives)
if choice then
if trace_alternatives then
logprocess("%s: replacing %s by alternative %a to %s, %s",pref(kind,lookupname),gref(getchar(start)),choice,gref(choice),comment)
end
resetinjection(start)
setchar(start,choice)
else
if trace_alternatives then
logwarning("%s: no variant %a for %s, %s",pref(kind,lookupname),value,gref(getchar(start)),comment)
end
end
return head, start, true
end
function handlers.gsub_multiple(head,start,kind,lookupname,multiple,sequence)
if trace_multiples then
logprocess("%s: replacing %s by multiple %s",pref(kind,lookupname),gref(getchar(start)),gref(multiple))
end
return multiple_glyphs(head,start,multiple,sequence.flags[1])
end
function handlers.gsub_ligature(head,start,kind,lookupname,ligature,sequence)
local s, stop = getnext(start), nil
local startchar = getchar(start)
if marks[startchar] then
while s do
local id = getid(s)
if id == glyph_code and getfont(s) == currentfont and getsubtype(s)<256 then
local lg = ligature[getchar(s)]
if lg then
stop = s
ligature = lg
s = getnext(s)
else
break
end
else
break
end
end
if stop then
local lig = ligature.ligature
if lig then
if trace_ligatures then
local stopchar = getchar(stop)
head, start = markstoligature(kind,lookupname,head,start,stop,lig)
logprocess("%s: replacing %s upto %s by ligature %s case 1",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(getchar(start)))
else
head, start = markstoligature(kind,lookupname,head,start,stop,lig)
end
return head, start, true, false
else
-- ok, goto next lookup
end
end
else
local skipmark = sequence.flags[1]
local discfound = false
local lastdisc = nil
while s do
local id = getid(s)
if id == glyph_code and getsubtype(s)<256 then -- not needed
if getfont(s) == currentfont then -- also not needed only when mark
local char = getchar(s)
if skipmark and marks[char] then
s = getnext(s)
else -- ligature is a tree
local lg = ligature[char] -- can there be multiple in a row? maybe in a bad font
if lg then
if not discfound and lastdisc then
discfound = lastdisc
lastdisc = nil
end
stop = s -- needed for fake so outside then
ligature = lg
s = getnext(s)
else
break
end
end
else
break
end
elseif id == disc_code then
lastdisc = s
s = getnext(s)
else
break
end
end
local lig = ligature.ligature -- can't we get rid of this .ligature?
if lig then
if stop then
if trace_ligatures then
local stopchar = getchar(stop)
head, start = toligature(kind,lookupname,head,start,stop,lig,skipmark,discfound)
logprocess("%s: replacing %s upto %s by ligature %s case 2",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(getchar(start)))
else
head, start = toligature(kind,lookupname,head,start,stop,lig,skipmark,discfound)
end
else
-- weird but happens (in some arabic font)
resetinjection(start)
setchar(start,lig)
if trace_ligatures then
logprocess("%s: replacing %s by (no real) ligature %s case 3",pref(kind,lookupname),gref(startchar),gref(lig))
end
end
return head, start, true, discfound
else
-- weird but happens, pseudo ligatures ... just the components
end
end
return head, start, false, discfound
end
function handlers.gpos_single(head,start,kind,lookupname,kerns,sequence,injection)
local startchar = getchar(start)
local dx, dy, w, h = setpair(start,tfmdata.parameters.factor,rlmode,sequence.flags[4],kerns,injection) -- ,characters[startchar])
if trace_kerns then
logprocess("%s: shifting single %s by (%p,%p) and correction (%p,%p)",pref(kind,lookupname),gref(startchar),dx,dy,w,h)
end
return head, start, false
end
function handlers.gpos_pair(head,start,kind,lookupname,kerns,sequence,lookuphash,i,injection)
-- todo: kerns in disc nodes: pre, post, replace -> loop over disc too
-- todo: kerns in components of ligatures
local snext = getnext(start)
if not snext then
return head, start, false
else
local prev = start
local done = false
local factor = tfmdata.parameters.factor
local lookuptype = lookuptypes[lookupname]
while snext and getid(snext) == glyph_code and getfont(snext) == currentfont and getsubtype(snext)<256 do
local nextchar = getchar(snext)
local krn = kerns[nextchar]
if not krn and marks[nextchar] then
prev = snext
snext = getnext(snext)
else
if not krn then
-- skip
elseif type(krn) == "table" then
if lookuptype == "pair" then -- probably not needed
local a, b = krn[2], krn[3]
if a and #a > 0 then
local x, y, w, h = setpair(start,factor,rlmode,sequence.flags[4],a,injection) -- characters[startchar])
if trace_kerns then
local startchar = getchar(start)
logprocess("%s: shifting first of pair %s and %s by (%p,%p) and correction (%p,%p)",pref(kind,lookupname),gref(startchar),gref(nextchar),x,y,w,h)
end
end
if b and #b > 0 then
local x, y, w, h = setpair(snext,factor,rlmode,sequence.flags[4],b,injection) -- characters[nextchar])
if trace_kerns then
local startchar = getchar(start)
logprocess("%s: shifting second of pair %s and %s by (%p,%p) and correction (%p,%p)",pref(kind,lookupname),gref(startchar),gref(nextchar),x,y,w,h)
end
end
else -- wrong ... position has different entries
report_process("%s: check this out (old kern stuff)",pref(kind,lookupname))
-- local a, b = krn[2], krn[6]
-- if a and a ~= 0 then
-- local k = setkern(snext,factor,rlmode,a)
-- if trace_kerns then
-- logprocess("%s: inserting first kern %s between %s and %s",pref(kind,lookupname),k,gref(getchar(prev)),gref(nextchar))
-- end
-- end
-- if b and b ~= 0 then
-- logwarning("%s: ignoring second kern xoff %s",pref(kind,lookupname),b*factor)
-- end
end
done = true
elseif krn ~= 0 then
local k = setkern(snext,factor,rlmode,krn,injection)
if trace_kerns then
logprocess("%s: inserting kern %s between %s and %s",pref(kind,lookupname),k,gref(getchar(prev)),gref(nextchar)) -- prev?
end
done = true
end
break
end
end
return head, start, done
end
end
--[[ldx--
<p>We get hits on a mark, but we're not sure if the it has to be applied so
we need to explicitly test for basechar, baselig and basemark entries.</p>
--ldx]]--
function handlers.gpos_mark2base(head,start,kind,lookupname,markanchors,sequence)
local markchar = getchar(start)
if marks[markchar] then
local base = getprev(start) -- [glyph] [start=mark]
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
local basechar = getchar(base)
if marks[basechar] then
while true do
base = getprev(base)
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
basechar = getchar(base)
if not marks[basechar] then
break
end
else
if trace_bugs then
logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
end
end
local baseanchors = descriptions[basechar]
if baseanchors then
baseanchors = baseanchors.anchors
end
if baseanchors then
local baseanchors = baseanchors['basechar']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar])
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%p,%p)",
pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
end
return head, start, true
end
end
end
if trace_bugs then
logwarning("%s, no matching anchors for mark %s and base %s",pref(kind,lookupname),gref(markchar),gref(basechar))
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar))
onetimemessage(currentfont,basechar,"no base anchors",report_fonts)
end
elseif trace_bugs then
logwarning("%s: prev node is no char",pref(kind,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
function handlers.gpos_mark2ligature(head,start,kind,lookupname,markanchors,sequence)
-- check chainpos variant
local markchar = getchar(start)
if marks[markchar] then
local base = getprev(start) -- [glyph] [optional marks] [start=mark]
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
local basechar = getchar(base)
if marks[basechar] then
while true do
base = getprev(base)
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
basechar = getchar(base)
if not marks[basechar] then
break
end
else
if trace_bugs then
logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
end
end
local index = getligaindex(start)
local baseanchors = descriptions[basechar]
if baseanchors then
baseanchors = baseanchors.anchors
if baseanchors then
local baseanchors = baseanchors['baselig']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor, ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
ba = ba[index]
if ba then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar]) -- index
if trace_marks then
logprocess("%s, anchor %s, index %s, bound %s: anchoring mark %s to baselig %s at index %s => (%p,%p)",
pref(kind,lookupname),anchor,index,bound,gref(markchar),gref(basechar),index,dx,dy)
end
return head, start, true
else
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and baselig %s with index %a",pref(kind,lookupname),gref(markchar),gref(basechar),index)
end
end
end
end
end
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and baselig %s",pref(kind,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar))
onetimemessage(currentfont,basechar,"no base anchors",report_fonts)
end
elseif trace_bugs then
logwarning("%s: prev node is no char",pref(kind,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
function handlers.gpos_mark2mark(head,start,kind,lookupname,markanchors,sequence)
local markchar = getchar(start)
if marks[markchar] then
local base = getprev(start) -- [glyph] [basemark] [start=mark]
local slc = getligaindex(start)
if slc then -- a rather messy loop ... needs checking with husayni
while base do
local blc = getligaindex(base)
if blc and blc ~= slc then
base = getprev(base)
else
break
end
end
end
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then -- subtype test can go
local basechar = getchar(base)
local baseanchors = descriptions[basechar]
if baseanchors then
baseanchors = baseanchors.anchors
if baseanchors then
baseanchors = baseanchors['basemark']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar],true)
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%p,%p)",
pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
end
return head, start, true
end
end
end
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and basemark %s",pref(kind,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar))
onetimemessage(currentfont,basechar,"no base anchors",report_fonts)
end
elseif trace_bugs then
logwarning("%s: prev node is no mark",pref(kind,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
function handlers.gpos_cursive(head,start,kind,lookupname,exitanchors,sequence) -- to be checked
local alreadydone = cursonce and getprop(start,a_cursbase)
if not alreadydone then
local done = false
local startchar = getchar(start)
if marks[startchar] then
if trace_cursive then
logprocess("%s: ignoring cursive for mark %s",pref(kind,lookupname),gref(startchar))
end
else
local nxt = getnext(start)
while not done and nxt and getid(nxt) == glyph_code and getfont(nxt) == currentfont and getsubtype(nxt)<256 do
local nextchar = getchar(nxt)
if marks[nextchar] then
-- should not happen (maybe warning)
nxt = getnext(nxt)
else
local entryanchors = descriptions[nextchar]
if entryanchors then
entryanchors = entryanchors.anchors
if entryanchors then
entryanchors = entryanchors['centry']
if entryanchors then
local al = anchorlookups[lookupname]
for anchor, entry in next, entryanchors do
if al[anchor] then
local exit = exitanchors[anchor]
if exit then
local dx, dy, bound = setcursive(start,nxt,tfmdata.parameters.factor,rlmode,exit,entry,characters[startchar],characters[nextchar])
if trace_cursive then
logprocess("%s: moving %s to %s cursive (%p,%p) using anchor %s and bound %s in rlmode %s",pref(kind,lookupname),gref(startchar),gref(nextchar),dx,dy,anchor,bound,rlmode)
end
done = true
break
end
end
end
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(startchar))
onetimemessage(currentfont,startchar,"no entry anchors",report_fonts)
end
break
end
end
end
return head, start, done
else
if trace_cursive and trace_details then
logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(getchar(start)),alreadydone)
end
return head, start, false
end
end
--[[ldx--
<p>I will implement multiple chain replacements once I run into a font that uses
it. It's not that complex to handle.</p>
--ldx]]--
local chainprocs = { }
local function logprocess(...)
if trace_steps then
registermessage(...)
end
report_subchain(...)
end
local logwarning = report_subchain
local function logprocess(...)
if trace_steps then
registermessage(...)
end
report_chain(...)
end
local logwarning = report_chain
-- We could share functions but that would lead to extra function calls with many
-- arguments, redundant tests and confusing messages.
function chainprocs.chainsub(head,start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname)
logwarning("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname))
return head, start, false
end
-- The reversesub is a special case, which is why we need to store the replacements
-- in a bit weird way. There is no lookup and the replacement comes from the lookup
-- itself. It is meant mostly for dealing with Urdu.
function chainprocs.reversesub(head,start,stop,kind,chainname,currentcontext,lookuphash,replacements)
local char = getchar(start)
local replacement = replacements[char]
if replacement then
if trace_singles then
logprocess("%s: single reverse replacement of %s by %s",cref(kind,chainname),gref(char),gref(replacement))
end
resetinjection(start)
setchar(start,replacement)
return head, start, true
else
return head, start, false
end
end
--[[ldx--
<p>This chain stuff is somewhat tricky since we can have a sequence of actions to be
applied: single, alternate, multiple or ligature where ligature can be an invalid
one in the sense that it will replace multiple by one but not neccessary one that
looks like the combination (i.e. it is the counterpart of multiple then). For
example, the following is valid:</p>
<typing>
<line>xxxabcdexxx [single a->A][multiple b->BCD][ligature cde->E] xxxABCDExxx</line>
</typing>
<p>Therefore we we don't really do the replacement here already unless we have the
single lookup case. The efficiency of the replacements can be improved by deleting
as less as needed but that would also make the code even more messy.</p>
--ldx]]--
-- local function delete_till_stop(head,start,stop,ignoremarks) -- keeps start
-- local n = 1
-- if start == stop then
-- -- done
-- elseif ignoremarks then
-- repeat -- start x x m x x stop => start m
-- local next = getnext(start)
-- if not marks[getchar(next)] then
-- local components = getnext(next,"components")
-- if components then -- probably not needed
-- flush_node_list(components)
-- end
-- head = delete_node(head,next)
-- end
-- n = n + 1
-- until next == stop
-- else -- start x x x stop => start
-- repeat
-- local next = getnext(start)
-- local components = getfield(next,"components")
-- if components then -- probably not needed
-- flush_node_list(components)
-- end
-- head = delete_node(head,next)
-- n = n + 1
-- until next == stop
-- end
-- return head, n
-- end
--[[ldx--
<p>Here we replace start by a single variant.</p>
--ldx]]--
function chainprocs.gsub_single(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex)
-- todo: marks ?
local current = start
local subtables = currentlookup.subtables
if #subtables > 1 then
logwarning("todo: check if we need to loop over the replacements: % t",subtables)
end
while current do
if getid(current) == glyph_code then
local currentchar = getchar(current)
local lookupname = subtables[1] -- only 1
local replacement = lookuphash[lookupname]
if not replacement then
if trace_bugs then
logwarning("%s: no single hits",cref(kind,chainname,chainlookupname,lookupname,chainindex))
end
else
replacement = replacement[currentchar]
if not replacement or replacement == "" then
if trace_bugs then
logwarning("%s: no single for %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(currentchar))
end
else
if trace_singles then
logprocess("%s: replacing single %s by %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(currentchar),gref(replacement))
end
resetinjection(current)
setchar(current,replacement)
end
end
return head, start, true
elseif current == stop then
break
else
current = getnext(current)
end
end
return head, start, false
end
--[[ldx--
<p>Here we replace start by a sequence of new glyphs.</p>
--ldx]]--
function chainprocs.gsub_multiple(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
-- local head, n = delete_till_stop(head,start,stop)
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local replacements = lookuphash[lookupname]
if not replacements then
if trace_bugs then
logwarning("%s: no multiple hits",cref(kind,chainname,chainlookupname,lookupname))
end
else
replacements = replacements[startchar]
if not replacements or replacement == "" then
if trace_bugs then
logwarning("%s: no multiple for %s",cref(kind,chainname,chainlookupname,lookupname),gref(startchar))
end
else
if trace_multiples then
logprocess("%s: replacing %s by multiple characters %s",cref(kind,chainname,chainlookupname,lookupname),gref(startchar),gref(replacements))
end
return multiple_glyphs(head,start,replacements,currentlookup.flags[1])
end
end
return head, start, false
end
--[[ldx--
<p>Here we replace start by new glyph. First we delete the rest of the match.</p>
--ldx]]--
-- char_1 mark_1 -> char_x mark_1 (ignore marks)
-- char_1 mark_1 -> char_x
-- to be checked: do we always have just one glyph?
-- we can also have alternates for marks
-- marks come last anyway
-- are there cases where we need to delete the mark
function chainprocs.gsub_alternate(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local current = start
local subtables = currentlookup.subtables
local value = featurevalue == true and tfmdata.shared.features[kind] or featurevalue
while current do
if getid(current) == glyph_code then -- is this check needed?
local currentchar = getchar(current)
local lookupname = subtables[1]
local alternatives = lookuphash[lookupname]
if not alternatives then
if trace_bugs then
logwarning("%s: no alternative hit",cref(kind,chainname,chainlookupname,lookupname))
end
else
alternatives = alternatives[currentchar]
if alternatives then
local choice, comment = get_alternative_glyph(current,alternatives,value,trace_alternatives)
if choice then
if trace_alternatives then
logprocess("%s: replacing %s by alternative %a to %s, %s",cref(kind,chainname,chainlookupname,lookupname),gref(char),choice,gref(choice),comment)
end
resetinjection(start)
setchar(start,choice)
else
if trace_alternatives then
logwarning("%s: no variant %a for %s, %s",cref(kind,chainname,chainlookupname,lookupname),value,gref(char),comment)
end
end
elseif trace_bugs then
logwarning("%s: no alternative for %s, %s",cref(kind,chainname,chainlookupname,lookupname),gref(currentchar),comment)
end
end
return head, start, true
elseif current == stop then
break
else
current = getnext(current)
end
end
return head, start, false
end
--[[ldx--
<p>When we replace ligatures we use a helper that handles the marks. I might change
this function (move code inline and handle the marks by a separate function). We
assume rather stupid ligatures (no complex disc nodes).</p>
--ldx]]--
function chainprocs.gsub_ligature(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex)
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local ligatures = lookuphash[lookupname]
if not ligatures then
if trace_bugs then
logwarning("%s: no ligature hits",cref(kind,chainname,chainlookupname,lookupname,chainindex))
end
else
ligatures = ligatures[startchar]
if not ligatures then
if trace_bugs then
logwarning("%s: no ligatures starting with %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar))
end
else
local s = getnext(start)
local discfound = false
local last = stop
local nofreplacements = 1
local skipmark = currentlookup.flags[1]
while s do
local id = getid(s)
if id == disc_code then
if not discfound then
discfound = s
end
if s == stop then
break -- okay? or before the disc
else
s = getnext(s)
end
else
local schar = getchar(s)
if skipmark and marks[schar] then -- marks
s = getnext(s)
else
local lg = ligatures[schar]
if lg then
ligatures, last, nofreplacements = lg, s, nofreplacements + 1
if s == stop then
break
else
s = getnext(s)
end
else
break
end
end
end
end
local l2 = ligatures.ligature
if l2 then
if chainindex then
stop = last
end
if trace_ligatures then
if start == stop then
logprocess("%s: replacing character %s by ligature %s case 3",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(l2))
else
logprocess("%s: replacing character %s upto %s by ligature %s case 4",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(getchar(stop)),gref(l2))
end
end
head, start = toligature(kind,lookupname,head,start,stop,l2,currentlookup.flags[1],discfound)
return head, start, true, nofreplacements, discfound
elseif trace_bugs then
if start == stop then
logwarning("%s: replacing character %s by ligature fails",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar))
else
logwarning("%s: replacing character %s upto %s by ligature fails",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(getchar(stop)))
end
end
end
end
return head, start, false, 0, false
end
function chainprocs.gpos_single(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence)
-- untested .. needs checking for the new model
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local kerns = lookuphash[lookupname]
if kerns then
kerns = kerns[startchar] -- needed ?
if kerns then
local dx, dy, w, h = setpair(start,tfmdata.parameters.factor,rlmode,sequence.flags[4],kerns) -- ,characters[startchar])
if trace_kerns then
logprocess("%s: shifting single %s by (%p,%p) and correction (%p,%p)",cref(kind,chainname,chainlookupname),gref(startchar),dx,dy,w,h)
end
end
end
return head, start, false
end
function chainprocs.gpos_pair(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence)
local snext = getnext(start)
if snext then
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local kerns = lookuphash[lookupname]
if kerns then
kerns = kerns[startchar]
if kerns then
local lookuptype = lookuptypes[lookupname]
local prev, done = start, false
local factor = tfmdata.parameters.factor
while snext and getid(snext) == glyph_code and getfont(snext) == currentfont and getsubtype(snext)<256 do
local nextchar = getchar(snext)
local krn = kerns[nextchar]
if not krn and marks[nextchar] then
prev = snext
snext = getnext(snext)
else
if not krn then
-- skip
elseif type(krn) == "table" then
if lookuptype == "pair" then
local a, b = krn[2], krn[3]
if a and #a > 0 then
local startchar = getchar(start)
local x, y, w, h = setpair(start,factor,rlmode,sequence.flags[4],a) -- ,characters[startchar])
if trace_kerns then
logprocess("%s: shifting first of pair %s and %s by (%p,%p) and correction (%p,%p)",cref(kind,chainname,chainlookupname),gref(startchar),gref(nextchar),x,y,w,h)
end
end
if b and #b > 0 then
local startchar = getchar(start)
local x, y, w, h = setpair(snext,factor,rlmode,sequence.flags[4],b) -- ,characters[nextchar])
if trace_kerns then
logprocess("%s: shifting second of pair %s and %s by (%p,%p) and correction (%p,%p)",cref(kind,chainname,chainlookupname),gref(startchar),gref(nextchar),x,y,w,h)
end
end
else
report_process("%s: check this out (old kern stuff)",cref(kind,chainname,chainlookupname))
-- local a, b = krn[2], krn[6]
-- if a and a ~= 0 then
-- local k = setkern(snext,factor,rlmode,a)
-- if trace_kerns then
-- logprocess("%s: inserting first kern %s between %s and %s",cref(kind,chainname,chainlookupname),k,gref(getchar(prev)),gref(nextchar))
-- end
-- end
-- if b and b ~= 0 then
-- logwarning("%s: ignoring second kern xoff %s",cref(kind,chainname,chainlookupname),b*factor)
-- end
end
done = true
elseif krn ~= 0 then
local k = setkern(snext,factor,rlmode,krn)
if trace_kerns then
logprocess("%s: inserting kern %s between %s and %s",cref(kind,chainname,chainlookupname),k,gref(getchar(prev)),gref(nextchar))
end
done = true
end
break
end
end
return head, start, done
end
end
end
return head, start, false
end
function chainprocs.gpos_mark2base(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local markchar = getchar(start)
if marks[markchar] then
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local markanchors = lookuphash[lookupname]
if markanchors then
markanchors = markanchors[markchar]
end
if markanchors then
local base = getprev(start) -- [glyph] [start=mark]
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
local basechar = getchar(base)
if marks[basechar] then
while true do
base = getprev(base)
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
basechar = getchar(base)
if not marks[basechar] then
break
end
else
if trace_bugs then
logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar))
end
return head, start, false
end
end
end
local baseanchors = descriptions[basechar].anchors
if baseanchors then
local baseanchors = baseanchors['basechar']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar])
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%p,%p)",
cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
end
return head, start, true
end
end
end
if trace_bugs then
logwarning("%s, no matching anchors for mark %s and base %s",cref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
logwarning("%s: prev node is no char",cref(kind,chainname,chainlookupname,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar))
end
return head, start, false
end
function chainprocs.gpos_mark2ligature(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local markchar = getchar(start)
if marks[markchar] then
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local markanchors = lookuphash[lookupname]
if markanchors then
markanchors = markanchors[markchar]
end
if markanchors then
local base = getprev(start) -- [glyph] [optional marks] [start=mark]
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
local basechar = getchar(base)
if marks[basechar] then
while true do
base = getprev(base)
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then
basechar = getchar(base)
if not marks[basechar] then
break
end
else
if trace_bugs then
logwarning("%s: no base for mark %s",cref(kind,chainname,chainlookupname,lookupname),markchar)
end
return head, start, false
end
end
end
-- todo: like marks a ligatures hash
local index = getligaindex(start)
local baseanchors = descriptions[basechar].anchors
if baseanchors then
local baseanchors = baseanchors['baselig']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
ba = ba[index]
if ba then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar])
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to baselig %s at index %s => (%p,%p)",
cref(kind,chainname,chainlookupname,lookupname),anchor,a or bound,gref(markchar),gref(basechar),index,dx,dy)
end
return head, start, true
end
end
end
end
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and baselig %s",cref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
logwarning("feature %s, lookup %s: prev node is no char",kind,lookupname)
end
elseif trace_bugs then
logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar))
end
return head, start, false
end
function chainprocs.gpos_mark2mark(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local markchar = getchar(start)
if marks[markchar] then
-- local markanchors = descriptions[markchar].anchors markanchors = markanchors and markanchors.mark
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local markanchors = lookuphash[lookupname]
if markanchors then
markanchors = markanchors[markchar]
end
if markanchors then
local base = getprev(start) -- [glyph] [basemark] [start=mark]
local slc = getligaindex(start)
if slc then -- a rather messy loop ... needs checking with husayni
while base do
local blc = getligaindex(base)
if blc and blc ~= slc then
base = getprev(base)
else
break
end
end
end
if base and getid(base) == glyph_code and getfont(base) == currentfont and getsubtype(base)<256 then -- subtype test can go
local basechar = getchar(base)
local baseanchors = descriptions[basechar].anchors
if baseanchors then
baseanchors = baseanchors['basemark']
if baseanchors then
local al = anchorlookups[lookupname]
for anchor,ba in next, baseanchors do
if al[anchor] then
local ma = markanchors[anchor]
if ma then
local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma,characters[basechar],true)
if trace_marks then
logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%p,%p)",
cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
end
return head, start, true
end
end
end
if trace_bugs then
logwarning("%s: no matching anchors for mark %s and basemark %s",gref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar))
end
end
end
elseif trace_bugs then
logwarning("%s: prev node is no mark",cref(kind,chainname,chainlookupname,lookupname))
end
elseif trace_bugs then
logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar))
end
elseif trace_bugs then
logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar))
end
return head, start, false
end
function chainprocs.gpos_cursive(head,start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
local alreadydone = cursonce and getprop(start,a_cursbase)
if not alreadydone then
local startchar = getchar(start)
local subtables = currentlookup.subtables
local lookupname = subtables[1]
local exitanchors = lookuphash[lookupname]
if exitanchors then
exitanchors = exitanchors[startchar]
end
if exitanchors then
local done = false
if marks[startchar] then
if trace_cursive then
logprocess("%s: ignoring cursive for mark %s",pref(kind,lookupname),gref(startchar))
end
else
local nxt = getnext(start)
while not done and nxt and getid(nxt) == glyph_code and getfont(nxt) == currentfont and getsubtype(nxt)<256 do
local nextchar = getchar(nxt)
if marks[nextchar] then
-- should not happen (maybe warning)
nxt = getnext(nxt)
else
local entryanchors = descriptions[nextchar]
if entryanchors then
entryanchors = entryanchors.anchors
if entryanchors then
entryanchors = entryanchors['centry']
if entryanchors then
local al = anchorlookups[lookupname]
for anchor, entry in next, entryanchors do
if al[anchor] then
local exit = exitanchors[anchor]
if exit then
local dx, dy, bound = setcursive(start,nxt,tfmdata.parameters.factor,rlmode,exit,entry,characters[startchar],characters[nextchar])
if trace_cursive then
logprocess("%s: moving %s to %s cursive (%p,%p) using anchor %s and bound %s in rlmode %s",pref(kind,lookupname),gref(startchar),gref(nextchar),dx,dy,anchor,bound,rlmode)
end
done = true
break
end
end
end
end
end
elseif trace_bugs then
-- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(startchar))
onetimemessage(currentfont,startchar,"no entry anchors",report_fonts)
end
break
end
end
end
return head, start, done
else
if trace_cursive and trace_details then
logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(getchar(start)),alreadydone)
end
return head, start, false
end
end
return head, start, false
end
-- what pointer to return, spec says stop
-- to be discussed ... is bidi changer a space?
-- elseif char == zwnj and sequence[n][32] then -- brrr
-- somehow l or f is global
-- we don't need to pass the currentcontext, saves a bit
-- make a slow variant then can be activated but with more tracing
local function show_skip(kind,chainname,char,ck,class)
if ck[9] then
logwarning("%s: skipping char %s, class %a, rule %a, lookuptype %a, %a => %a",cref(kind,chainname),gref(char),class,ck[1],ck[2],ck[9],ck[10])
else
logwarning("%s: skipping char %s, class %a, rule %a, lookuptype %a",cref(kind,chainname),gref(char),class,ck[1],ck[2])
end
end
-- A previous version had disc collapsing code in the (single sub) handler plus some
-- checking in the main loop, but that left the pre/post sequences undone. The best
-- solution is to add some checking there and backtrack when a replace/post matches
-- but it takes a bit of work to figure out an efficient way (this is what the sweep*
-- names refer to). I might look into that variant one day again as it can replace
-- some other code too. In that approach we can have a special version for gub and pos
-- which gains some speed. This method does the test and passes info to the handlers
-- (sweepnode, sweepmode, sweepprev, sweepnext, etc). Here collapsing is handled in the
-- main loop which also makes code elsewhere simpler (i.e. no need for the other special
-- runners and disc code in ligature building). I also experimented with pushing preceding
-- glyphs sequences in the replace/pre fields beforehand which saves checking afterwards
-- but at the cost of duplicate glyphs (memory) but it's too much overhead (runtime).
--
-- In the meantime Kai had moved the code from the single chain into a more general handler
-- and this one (renamed to chaindisk) is used now. I optimized the code a bit and brought
-- it in sycn with the other code. Hopefully I didn't introduce errors. Note: this somewhat
-- complex approach is meant for fonts that implement (for instance) ligatures by character
-- replacement which to some extend is not that suitable for hyphenation. I also use some
-- helpers. This method passes some states but reparses the list. There is room for a bit of
-- speed up but that will be done in the context version. (In fact a partial rewrite of all
-- code can bring some more efficientry.)
--
-- I didn't test it with extremes but successive disc nodes still can give issues but in
-- order to handle that we need more complex code which also slows down even more. The main
-- loop variant could deal with that: test, collapse, backtrack.
local function chaindisk(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,chainindex,sequence,chainproc)
if not start then
return head, start, false
end
local startishead = start == head
local seq = ck[3]
local f = ck[4]
local l = ck[5]
local s = #seq
local done = false
local sweepnode = sweepnode
local sweeptype = sweeptype
local sweepoverflow = false
local checkdisc = getprev(head) -- hm bad name head
local keepdisc = not sweepnode
local lookaheaddisc = nil
local backtrackdisc = nil
local current = start
local last = start
local prev = getprev(start)
-- fishy: so we can overflow and then go on in the sweep?
local i = f
while i <= l do
local id = getid(current)
if id == glyph_code then
i = i + 1
last = current
current = getnext(current)
elseif id == disc_code then
if keepdisc then
keepdisc = false
if notmatchpre[current] ~= notmatchreplace[current] then
lookaheaddisc = current
end
local replace = getfield(current,"replace")
while replace and i <= l do
if getid(replace) == glyph_code then
i = i + 1
end
replace = getnext(replace)
end
last = current
current = getnext(c)
else
head, current = flattendisk(head,current)
end
else
last = current
current = getnext(current)
end
if current then
-- go on
elseif sweepoverflow then
-- we already are folling up on sweepnode
break
elseif sweeptype == "post" or sweeptype == "replace" then
current = getnext(sweepnode)
if current then
sweeptype = nil
sweepoverflow = true
else
break
end
end
end
if sweepoverflow then
local prev = current and getprev(current)
if not current or prev ~= sweepnode then
local head = getnext(sweepnode)
local tail = nil
if prev then
tail = prev
setprev(current,sweepnode)
else
tail = find_node_tail(head)
end
setnext(sweepnode,current)
setprev(head,nil)
setnext(tail,nil)
appenddisc(sweepnode,head)
end
end
if l < s then
local i = l
local t = sweeptype == "post" or sweeptype == "replace"
while current and i < s do
local id = getid(current)
if id == glyph_code then
i = i + 1
current = getnext(current)
elseif id == disc_code then
if keepdisc then
keepdisc = false
if notmatchpre[current] ~= notmatchreplace[current] then
lookaheaddisc = current
end
local replace = getfield(c,"replace")
while replace and i < s do
if getid(replace) == glyph_code then
i = i + 1
end
replace = getnext(replace)
end
current = getnext(current)
elseif notmatchpre[current] ~= notmatchreplace[current] then
head, current = flattendisk(head,current)
else
current = getnext(current) -- HH
end
else
current = getnext(current)
end
if not current and t then
current = getnext(sweepnode)
if current then
sweeptype = nil
end
end
end
end
if f > 1 then
local current = prev
local i = f
local t = sweeptype == "pre" or sweeptype == "replace"
if not current and t and current == checkdisk then
current = getprev(sweepnode)
end
while current and i > 1 do -- missing getprev added / moved outside
local id = getid(current)
if id == glyph_code then
i = i - 1
elseif id == disc_code then
if keepdisc then
keepdisc = false
if notmatchpost[current] ~= notmatchreplace[current] then
backtrackdisc = current
end
local replace = getfield(current,"replace")
while replace and i > 1 do
if getid(replace) == glyph_code then
i = i - 1
end
replace = getnext(replace)
end
elseif notmatchpost[current] ~= notmatchreplace[current] then
head, current = flattendisk(head,current)
end
end
current = getprev(current)
if t and current == checkdisk then
current = getprev(sweepnode)
end
end
end
local ok = false
if lookaheaddisc then
local cf = start
local cl = getprev(lookaheaddisc)
local cprev = getprev(start)
local insertedmarks = 0
while cprev and getid(cf) == glyph_code and getfont(cf) == currentfont and getsubtype(cf) < 256 and marks[getchar(cf)] do
insertedmarks = insertedmarks + 1
cf = cprev
startishead = cf == head
cprev = getprev(cprev)
end
setprev(lookaheaddisc,cprev)
if cprev then
setnext(cprev,lookaheaddisc)
end
setprev(cf,nil)
setnext(cl,nil)
if startishead then
head = lookaheaddisc
end
local replace = getfield(lookaheaddisc,"replace")
local pre = getfield(lookaheaddisc,"pre")
local new = copy_node_list(cf)
local cnew = new
for i=1,insertedmarks do
cnew = getnext(cnew)
end
local clast = cnew
for i=f,l do
clast = getnext(clast)
end
if not notmatchpre[lookaheaddisc] then
cf, start, ok = chainproc(cf,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if not notmatchreplace[lookaheaddisc] then
new, cnew, ok = chainproc(new,cnew,clast,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if pre then
setnext(cl,pre)
setprev(pre,cl)
end
if replace then
local tail = find_node_tail(new)
setnext(tail,replace)
setprev(replace,tail)
end
setfield(lookaheaddisc,"pre",cf) -- also updates tail
setfield(lookaheaddisc,"replace",new) -- also updates tail
start = getprev(lookaheaddisc)
sweephead[cf] = getnext(clast)
sweephead[new] = getnext(last)
elseif backtrackdisc then
local cf = getnext(backtrackdisc)
local cl = start
local cnext = getnext(start)
local insertedmarks = 0
while cnext and getid(cnext) == glyph_code and getfont(cnext) == currentfont and getsubtype(cnext) < 256 and marks[getchar(cnext)] do
insertedmarks = insertedmarks + 1
cl = cnext
cnext = getnext(cnext)
end
if cnext then
setprev(cnext,backtrackdisc)
end
setnext(backtrackdisc,cnext)
setprev(cf,nil)
setnext(cl,nil)
local replace = getfield(backtrackdisc,"replace")
local post = getfield(backtrackdisc,"post")
local new = copy_node_list(cf)
local cnew = find_node_tail(new)
for i=1,insertedmarks do
cnew = getprev(cnew)
end
local clast = cnew
for i=f,l do
clast = getnext(clast)
end
if not notmatchpost[backtrackdisc] then
cf, start, ok = chainproc(cf,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if not notmatchreplace[backtrackdisc] then
new, cnew, ok = chainproc(new,cnew,clast,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if post then
local tail = find_node_tail(post)
setnext(tail,cf)
setprev(cf,tail)
else
post = cf
end
if replace then
local tail = find_node_tail(replace)
setnext(tail,new)
setprev(new,tail)
else
replace = new
end
setfield(backtrackdisc,"post",post) -- also updates tail
setfield(backtrackdisc,"replace",replace) -- also updates tail
start = getprev(backtrackdisc)
sweephead[post] = getnext(clast)
sweephead[replace] = getnext(last)
else
head, start, ok = chainproc(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
return head, start, ok
end
local function normal_handle_contextchain(head,start,kind,chainname,contexts,sequence,lookuphash)
local sweepnode = sweepnode
local sweeptype = sweeptype
local diskseen = false
local checkdisc = getprev(head)
local flags = sequence.flags
local done = false
local skipmark = flags[1]
local skipligature = flags[2]
local skipbase = flags[3]
local markclass = sequence.markclass
local skipped = false
for k=1,#contexts do -- i've only seen ccmp having > 1 (e.g. dejavu)
local match = true
local current = start
local last = start
local ck = contexts[k]
local seq = ck[3]
local s = #seq
-- f..l = mid string
if s == 1 then
-- never happens
match = getid(current) == glyph_code and getfont(current) == currentfont and getsubtype(current)<256 and seq[1][getchar(current)]
else
-- maybe we need a better space check (maybe check for glue or category or combination)
-- we cannot optimize for n=2 because there can be disc nodes
local f = ck[4]
local l = ck[5]
-- current match
if f == 1 and f == l then -- current only
-- already a hit
-- match = true
else -- before/current/after | before/current | current/after
-- no need to test first hit (to be optimized)
if f == l then -- new, else last out of sync (f is > 1)
-- match = true
else
local discfound = nil
local n = f + 1
last = getnext(last)
while n <= l do
if not last and (sweeptype == "post" or sweeptype == "replace") then
last = getnext(sweepnode)
sweeptype = nil
end
if last then
local id = getid(last)
if id == glyph_code then
if getfont(last) == currentfont and getsubtype(last)<256 then
local char = getchar(last)
local ccd = descriptions[char]
if ccd then
local class = ccd.class or "base"
if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
skipped = true
if trace_skips then
show_skip(kind,chainname,char,ck,class)
end
last = getnext(last)
elseif seq[n][char] then
if n < l then
last = getnext(last)
end
n = n + 1
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
elseif id == disc_code then
diskseen = true
discfound = last
notmatchpre[last] = nil
notmatchpost[last] = true
notmatchreplace[last] = nil
local pre = getfield(last,"pre")
local replace = getfield(last,"replace")
if pre then
local n = n
while pre do
if seq[n][getchar(pre)] then
n = n + 1
pre = getnext(pre)
if n > l then
break
end
else
notmatchpre[last] = true
break
end
end
if n <= l then
notmatchpre[last] = true
end
else
notmatchpre[last] = true
end
if replace then
-- so far we never entered this branch
while replace do
if seq[n][getchar(replace)] then
n = n + 1
replace = getnext(replace)
if n > l then
break
end
else
notmatchreplace[last] = true
match = not notmatchpre[last]
break
end
end
match = not notmatchpre[last]
end
last = getnext(last)
else
match = false
break
end
else
match = false
break
end
end
end
end
-- before
if match and f > 1 then
local prev = getprev(start)
if prev then
if prev == checkdisc and (sweeptype == "pre" or sweeptype == "replace") then
prev = getprev(sweepnode)
-- sweeptype = nil
end
if prev then
local discfound = nil
local n = f - 1
while n >= 1 do
if prev then
local id = getid(prev)
if id == glyph_code then
if getfont(prev) == currentfont and getsubtype(prev)<256 then -- normal char
local char = getchar(prev)
local ccd = descriptions[char]
if ccd then
local class = ccd.class
if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
skipped = true
if trace_skips then
show_skip(kind,chainname,char,ck,class)
end
elseif seq[n][char] then
n = n -1
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpost[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpost[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpost[discfound]
else
match = false
end
break
end
elseif id == disc_code then
-- the special case: f i where i becomes dottless i ..
diskseen = true
discfound = prev
notmatchpre[prev] = true
notmatchpost[prev] = nil
notmatchreplace[prev] = nil
local pre = getfield(prev,"pre")
local post = getfield(prev,"post")
local replace = getfield(prev,"replace")
if pre ~= start and post ~= start and replace ~= start then
if post then
local n = n
local posttail = find_node_tail(post)
while posttail do
if seq[n][getchar(posttail)] then
n = n - 1
if posttail == post then
break
else
posttail = getprev(posttail)
if n < 1 then
break
end
end
else
notmatchpost[prev] = true
break
end
end
if n >= 1 then
notmatchpost[prev] = true
end
else
notmatchpost[prev] = true
end
if replace then
-- we seldom enter this branch (e.g. on brill efficient)
local replacetail = find_node_tail(replace)
while replacetail do
if seq[n][getchar(replacetail)] then
n = n - 1
if replacetail == replace then
break
else
replacetail = getprev(replacetail)
if n < 1 then
break
end
end
else
notmatchreplace[prev] = true
match = not notmatchpost[prev]
break
end
end
if not match then
break
end
else
-- skip 'm
end
else
-- skip 'm
end
elseif seq[n][32] then
n = n -1
else
match = false
break
end
prev = getprev(prev)
elseif seq[n][32] then -- somewhat special, as zapfino can have many preceding spaces
n = n - 1
else
match = false
break
end
end
else
match = false
end
else
match = false
end
end
-- after
if match and s > l then
local current = last and getnext(last)
if not current then
if sweeptype == "post" or sweeptype == "replace" then
current = getnext(sweepnode)
-- sweeptype = nil
end
end
if current then
local discfound = nil
-- removed optimization for s-l == 1, we have to deal with marks anyway
local n = l + 1
while n <= s do
if current then
local id = getid(current)
if id == glyph_code then
if getfont(current) == currentfont and getsubtype(current)<256 then -- normal char
local char = getchar(current)
local ccd = descriptions[char]
if ccd then
local class = ccd.class
if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
skipped = true
if trace_skips then
show_skip(kind,chainname,char,ck,class)
end
elseif seq[n][char] then
n = n + 1
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
else
if discfound then
notmatchreplace[discfound] = true
match = not notmatchpre[discfound]
else
match = false
end
break
end
elseif id == disc_code then
diskseen = true
discfound = current
notmatchpre[current] = nil
notmatchpost[current] = true
notmatchreplace[current] = nil
local pre = getfield(current,"pre")
local replace = getfield(current,"replace")
if pre then
local n = n
while pre do
if seq[n][getchar(pre)] then
n = n + 1
pre = getnext(pre)
if n > s then
break
end
else
notmatchpre[current] = true
break
end
end
if n <= s then
notmatchpre[current] = true
end
else
notmatchpre[current] = true
end
if replace then
-- so far we never entered this branch
while replace do
if seq[n][getchar(replace)] then
n = n + 1
replace = getnext(replace)
if n > s then
break
end
else
notmatchreplace[current] = true
match = notmatchpre[current]
break
end
end
if not match then
break
end
else
-- skip 'm
end
elseif seq[n][32] then -- brrr
n = n + 1
else
match = false
break
end
current = getnext(current)
elseif seq[n][32] then
n = n + 1
else
match = false
break
end
end
else
match = false
end
end
end
if match then
-- can lookups be of a different type ?
local diskchain = diskseen or sweepnode
if trace_contexts then
local rule, lookuptype, f, l = ck[1], ck[2], ck[4], ck[5]
local char = getchar(start)
if ck[9] then
logwarning("%s: rule %s matches at char %s for (%s,%s,%s) chars, lookuptype %a, %a => %a",
cref(kind,chainname),rule,gref(char),f-1,l-f+1,s-l,lookuptype,ck[9],ck[10])
else
logwarning("%s: rule %s matches at char %s for (%s,%s,%s) chars, lookuptype %a",
cref(kind,chainname),rule,gref(char),f-1,l-f+1,s-l,lookuptype)
end
end
local chainlookups = ck[6]
if chainlookups then
local nofchainlookups = #chainlookups
-- we can speed this up if needed
if nofchainlookups == 1 then
local chainlookupname = chainlookups[1]
local chainlookup = lookuptable[chainlookupname]
if chainlookup then
local chainproc = chainprocs[chainlookup.type]
if chainproc then
local ok
if diskchain then
head, start, ok = chaindisk(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence,chainproc)
else
head, start, ok = chainproc(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
end
if ok then
done = true
end
else
logprocess("%s: %s is not yet supported",cref(kind,chainname,chainlookupname),chainlookup.type)
end
else -- shouldn't happen
logprocess("%s is not yet supported",cref(kind,chainname,chainlookupname))
end
else
local i = 1
while start and true do
if skipped then
while true do -- todo: use properties
local char = getchar(start)
local ccd = descriptions[char]
if ccd then
local class = ccd.class or "base"
if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
start = getnext(start)
else
break
end
else
break
end
end
end
-- see remark in ms standard under : LookupType 5: Contextual Substitution Subtable
local chainlookupname = chainlookups[i]
local chainlookup = lookuptable[chainlookupname]
if not chainlookup then
-- we just advance
i = i + 1
else
local chainproc = chainprocs[chainlookup.type]
if not chainproc then
-- actually an error
logprocess("%s: %s is not yet supported",cref(kind,chainname,chainlookupname),chainlookup.type)
i = i + 1
else
local ok, n
if diskchain then
head, start, ok = chaindisk(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence,chainproc)
else
head, start, ok, n = chainproc(head,start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,i,sequence)
end
-- messy since last can be changed !
if ok then
done = true
if n and n > 1 then
-- we have a ligature (cf the spec we advance one but we really need to test it
-- as there are fonts out there that are fuzzy and have too many lookups:
--
-- U+1105 U+119E U+1105 U+119E : sourcehansansklight: script=hang ccmp=yes
--
if i + n > nofchainlookups then
-- if trace_contexts then
-- logprocess("%s: quitting lookups",cref(kind,chainname))
-- end
break
else
-- we need to carry one
end
end
end
i = i + 1
end
end
if i > nofchainlookups or not start then
break
elseif start then
start = getnext(start)
end
end
end
else
local replacements = ck[7]
if replacements then
head, start, done = chainprocs.reversesub(head,start,last,kind,chainname,ck,lookuphash,replacements) -- sequence
else
done = quit_on_no_replacement -- can be meant to be skipped / quite inconsistent in fonts
if trace_contexts then
logprocess("%s: skipping match",cref(kind,chainname))
end
end
end
if done then
break -- out of contexts (new, needs checking)
end
end
end
if diskseen then -- maybe move up so that we can turn checking on/off
notmatchpre = { }
notmatchpost = { }
notmatchreplace = { }
end
return head, start, done
end
-- Because we want to keep this elsewhere (an because speed is less an issue) we
-- pass the font id so that the verbose variant can access the relevant helper tables.
local verbose_handle_contextchain = function(font,...)
logwarning("no verbose handler installed, reverting to 'normal'")
otf.setcontextchain()
return normal_handle_contextchain(...)
end
otf.chainhandlers = {
normal = normal_handle_contextchain,
verbose = verbose_handle_contextchain,
}
local handle_contextchain = nil
-- normal_handle_contextchain(head,start,kind,chainname,contexts,sequence,lookuphash)
function chained_contextchain(head,start,stop,...)
local steps = currentlookup.steps
local nofsteps = currentlookup.nofsteps
if nofsteps > 1 then
reportmoresteps(dataset,sequence)
end
return handle_contextchain(head,start,...)
end
function otf.setcontextchain(method)
if not method or method == "normal" or not otf.chainhandlers[method] then
if handle_contextchain then -- no need for a message while making the format
logwarning("installing normal contextchain handler")
end
handle_contextchain = normal_handle_contextchain
else
logwarning("installing contextchain handler %a",method)
local handler = otf.chainhandlers[method]
handle_contextchain = function(...)
return handler(currentfont,...) -- hm, get rid of ...
end
end
handlers.gsub_context = handle_contextchain
handlers.gsub_contextchain = handle_contextchain
handlers.gsub_reversecontextchain = handle_contextchain
handlers.gpos_contextchain = handle_contextchain
handlers.gpos_context = handle_contextchain
handlers.contextchain = handle_contextchain
end
chainprocs.gsub_context = chained_contextchain
chainprocs.gsub_contextchain = chained_contextchain
chainprocs.gsub_reversecontextchain = chained_contextchain
chainprocs.gpos_contextchain = chained_contextchain
chainprocs.gpos_context = chained_contextchain
otf.setcontextchain()
local missing = { } -- we only report once
local function logprocess(...)
if trace_steps then
registermessage(...)
end
report_process(...)
end
local logwarning = report_process
local function report_missing_cache(typ,lookup)
local f = missing[currentfont] if not f then f = { } missing[currentfont] = f end
local t = f[typ] if not t then t = { } f[typ] = t end
if not t[lookup] then
t[lookup] = true
logwarning("missing cache for lookup %a, type %a, font %a, name %a",lookup,typ,currentfont,tfmdata.properties.fullname)
end
end
local resolved = { } -- we only resolve a font,script,language pair once
-- todo: pass all these 'locals' in a table
local lookuphashes = { }
setmetatableindex(lookuphashes, function(t,font)
local lookuphash = fontdata[font].resources.lookuphash
if not lookuphash or not next(lookuphash) then
lookuphash = false
end
t[font] = lookuphash
return lookuphash
end)
-- fonts.hashes.lookups = lookuphashes
local autofeatures = fonts.analyzers.features
local featuretypes = otf.tables.featuretypes
local defaultscript = otf.features.checkeddefaultscript
local defaultlanguage = otf.features.checkeddefaultlanguage
local function initialize(sequence,script,language,enabled,autoscript,autolanguage)
local features = sequence.features
if features then
local order = sequence.order
if order then
local featuretype = featuretypes[sequence.type or "unknown"]
for i=1,#order do
local kind = order[i]
local valid = enabled[kind]
if valid then
local scripts = features[kind]
local languages = scripts and (
scripts[script] or
scripts[wildcard] or
(autoscript and defaultscript(featuretype,autoscript,scripts))
)
local enabled = languages and (
languages[language] or
languages[wildcard] or
(autolanguage and defaultlanguage(featuretype,autolanguage,languages))
)
if enabled then
return { valid, autofeatures[kind] or false, sequence, kind }
end
end
end
else
-- can't happen
end
end
return false
end
function otf.dataset(tfmdata,font) -- generic variant, overloaded in context
local shared = tfmdata.shared
local properties = tfmdata.properties
local language = properties.language or "dflt"
local script = properties.script or "dflt"
local enabled = shared.features
local autoscript = enabled and enabled.autoscript
local autolanguage = enabled and enabled.autolanguage
local res = resolved[font]
if not res then
res = { }
resolved[font] = res
end
local rs = res[script]
if not rs then
rs = { }
res[script] = rs
end
local rl = rs[language]
if not rl then
rl = {
-- indexed but we can also add specific data by key
}
rs[language] = rl
local sequences = tfmdata.resources.sequences
for s=1,#sequences do
local v = enabled and initialize(sequences[s],script,language,enabled,autoscript,autolanguage)
if v then
rl[#rl+1] = v
end
end
end
return rl
end
-- assumptions:
--
-- * languages that use complex disc nodes
local function kernrun(disc,run)
--
-- we catch <font 1><disc font 2>
--
if trace_kernruns then
report_run("kern") -- will be more detailed
end
--
local prev = getprev(disc) -- todo, keep these in the main loop
local next = getnext(disc) -- todo, keep these in the main loop
--
local pre = getfield(disc,"pre")
local post = getfield(disc,"post")
local replace = getfield(disc,"replace")
--
local prevmarks = prev
--
-- can be optional, because why on earth do we get a disc after a mark (okay, maybe when a ccmp
-- has happened but then it should be in the disc so basically this test indicates an error)
--
while prevmarks and getid(prevmarks) == glyph_code and marks[getchar(prevmarks)] and getfont(prevmarks) == currentfont and getsubtype(prevmarks) < 256 do
prevmarks = getprev(prevmarks)
end
--
if prev and (pre or replace) and not (getid(prev) == glyph_code and getfont(prev) == currentfont and getsubtype(prev)<256) then
prev = false
end
if next and (post or replace) and not (getid(next) == glyph_code and getfont(next) == currentfont and getsubtype(next)<256) then
next = false
end
--
if not pre then
-- go on
elseif prev then
local nest = getprev(pre)
setprev(pre,prev)
setnext(prev,pre)
run(prevmarks,"preinjections")
setprev(pre,nest)
setnext(prev,disc)
else
run(pre,"preinjections")
end
--
if not post then
-- go on
elseif next then
local tail = find_node_tail(post)
setnext(tail,next)
setprev(next,tail)
run(post,"postinjections",next)
setnext(tail,nil)
setprev(next,disc)
else
run(post,"postinjections")
end
--
if not replace and prev and next then
-- this should be already done by discfound
setnext(prev,next)
setprev(next,prev)
run(prevmarks,"injections",next)
setnext(prev,disc)
setprev(next,disc)
elseif prev and next then
local tail = find_node_tail(replace)
local nest = getprev(replace)
setprev(replace,prev)
setnext(prev,replace)
setnext(tail,next)
setprev(next,tail)
run(prevmarks,"replaceinjections",next)
setprev(replace,nest)
setnext(prev,disc)
setnext(tail,nil)
setprev(next,disc)
elseif prev then
local nest = getprev(replace)
setprev(replace,prev)
setnext(prev,replace)
run(prevmarks,"replaceinjections")
setprev(replace,nest)
setnext(prev,disc)
elseif next then
local tail = find_node_tail(replace)
setnext(tail,next)
setprev(next,tail)
run(replace,"replaceinjections",next)
setnext(tail,nil)
setprev(next,disc)
else
run(replace,"replaceinjections")
end
end
-- the if new test might be dangerous as luatex will check / set some tail stuff
-- in a temp node
local function comprun(disc,run)
if trace_compruns then
report_run("comp: %s",languages.serializediscretionary(disc))
end
--
local pre = getfield(disc,"pre")
if pre then
sweepnode = disc
sweeptype = "pre" -- in alternative code preinjections is used (also used then for proeprties, saves a variable)
local new, done = run(pre)
if done then
setfield(disc,"pre",new)
end
end
--
local post = getfield(disc,"post")
if post then
sweepnode = disc
sweeptype = "post"
local new, done = run(post)
if done then
setfield(disc,"post",new)
end
end
--
local replace = getfield(disc,"replace")
if replace then
sweepnode = disc
sweeptype = "replace"
local new, done = run(replace)
if done then
setfield(disc,"replace",new)
end
end
sweepnode = nil
sweeptype = nil
end
local function testrun(disc,trun,crun) -- use helper
local next = getnext(disc)
if next then
local replace = getfield(disc,"replace")
if replace then
local prev = getprev(disc)
if prev then
-- only look ahead
local tail = find_node_tail(replace)
-- local nest = getprev(replace)
setnext(tail,next)
setprev(next,tail)
if trun(replace,next) then
setfield(disc,"replace",nil) -- beware, side effects of nest so first
setnext(prev,replace)
setprev(replace,prev)
setprev(next,tail)
setnext(tail,next)
setprev(disc,nil)
setnext(disc,nil)
flush_node_list(disc)
return replace -- restart
else
setnext(tail,nil)
setprev(next,disc)
end
else
-- weird case
end
else
-- no need
end
else
-- weird case
end
comprun(disc,crun)
return next
end
local function discrun(disc,drun,krun)
local next = getnext(disc)
local prev = getprev(disc)
if trace_discruns then
report_run("disc") -- will be more detailed
end
if next and prev then
setnext(prev,next)
-- setprev(next,prev)
drun(prev)
setnext(prev,disc)
-- setprev(next,disc)
end
--
local pre = getfield(disc,"pre")
if not pre then
-- go on
elseif prev then
local nest = getprev(pre)
setprev(pre,prev)
setnext(prev,pre)
krun(prev,"preinjections")
setprev(pre,nest)
setnext(prev,disc)
else
krun(pre,"preinjections")
end
return next
end
-- todo: maybe run lr and rl stretches
local function featuresprocessor(head,font,attr)
local lookuphash = lookuphashes[font] -- we can also check sequences here
if not lookuphash then
return head, false
end
head = tonut(head)
if trace_steps then
checkstep(head)
end
tfmdata = fontdata[font]
descriptions = tfmdata.descriptions
characters = tfmdata.characters
resources = tfmdata.resources
marks = resources.marks
anchorlookups = resources.lookup_to_anchor
lookuptable = resources.lookups
lookuptypes = resources.lookuptypes
lookuptags = resources.lookuptags
currentfont = font
rlmode = 0
sweephead = { }
local sequences = resources.sequences
local done = false
local datasets = otf.dataset(tfmdata,font,attr)
local dirstack = { } -- could move outside function
-- We could work on sub start-stop ranges instead but I wonder if there is that
-- much speed gain (experiments showed that it made not much sense) and we need
-- to keep track of directions anyway. Also at some point I want to play with
-- font interactions and then we do need the full sweeps.
-- Keeping track of the headnode is needed for devanagari (I generalized it a bit
-- so that multiple cases are also covered.)
-- We don't goto the next node of a disc node is created so that we can then treat
-- the pre, post and replace. It's abit of a hack but works out ok for most cases.
-- there can be less subtype and attr checking in the comprun etc helpers
for s=1,#datasets do
local dataset = datasets[s]
featurevalue = dataset[1] -- todo: pass to function instead of using a global
local attribute = dataset[2]
local sequence = dataset[3] -- sequences[s] -- also dataset[5]
local kind = dataset[4]
----- chain = dataset[5] -- sequence.chain or 0
local rlparmode = 0
local topstack = 0
local success = false
local typ = sequence.type
local gpossing = typ == "gpos_single" or typ == "gpos_pair" -- maybe all of them
local subtables = sequence.subtables
local handler = handlers[typ]
if typ == "gsub_reversecontextchain" then -- chain < 0
-- this is a limited case, no special treatments like 'init' etc
-- we need to get rid of this slide! probably no longer needed in latest luatex
local start = find_node_tail(head) -- slow (we can store tail because there's always a skip at the end): todo
while start do
local id = getid(start)
if id == glyph_code then
if getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = a == attr
else
a = true
end
if a then
local char = getchar(start)
for i=1,#subtables do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
-- todo: disc?
head, start, success = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,i)
if success then
break
end
end
else
report_missing_cache(typ,lookupname)
end
end
if start then start = getprev(start) end
else
start = getprev(start)
end
else
start = getprev(start)
end
else
start = getprev(start)
end
end
else
local ns = #subtables
local start = head -- local ?
rlmode = 0 -- to be checked ?
if ns == 1 then -- happens often
local lookupname = subtables[1]
local lookupcache = lookuphash[lookupname]
if not lookupcache then -- also check for empty cache
report_missing_cache(typ,lookupname)
else
local function c_run(head) -- no need to check for 256 and attr probably also the same
local done = false
local start = sweephead[head]
if start then
sweephead[head] = nil
else
start = head
end
while start do
local id = getid(start)
if id ~= glyph_code then
-- very unlikely
start = getnext(start)
elseif getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local lookupmatch = lookupcache[getchar(start)]
if lookupmatch then
-- sequence kan weg
local ok
head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,1)
if ok then
done = true
end
end
if start then start = getnext(start) end
else
start = getnext(start)
end
else
return head, false
end
end
if done then
success = true -- needed in this subrun?
end
return head, done
end
local function t_run(start,stop)
while start ~= stop do
local id = getid(start)
if id == glyph_code and getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local lookupmatch = lookupcache[getchar(start)]
if lookupmatch then -- hm, hyphens can match (tlig) so we need to really check
-- if we need more than ligatures we can outline the code and use functions
local s = getnext(start)
local l = nil
while s do
local lg = lookupmatch[getchar(s)]
if lg then
l = lg
s = getnext(s)
else
break
end
end
if l and l.ligature then
return true
end
end
end
start = getnext(start)
else
break
end
end
end
local function d_run(prev) -- we can assume that prev and next are glyphs
local a = getattr(prev,0)
if a then
a = (a == attr) and (not attribute or getprop(prev,a_state) == attribute)
else
a = not attribute or getprop(prev,a_state) == attribute
end
if a then
local lookupmatch = lookupcache[getchar(prev)]
if lookupmatch then
-- sequence kan weg
local h, d, ok = handler(head,prev,kind,lookupname,lookupmatch,sequence,lookuphash,1)
if ok then
done = true
success = true
end
end
end
end
local function k_run(sub,injection,last)
local a = getattr(sub,0)
if a then
a = (a == attr) and (not attribute or getprop(sub,a_state) == attribute)
else
a = not attribute or getprop(sub,a_state) == attribute
end
if a then
-- sequence kan weg
for n in traverse_nodes(sub) do -- only gpos
if n == last then
break
end
local id = getid(n)
if id == glyph_code then
local lookupmatch = lookupcache[getchar(n)]
if lookupmatch then
local h, d, ok = handler(sub,n,kind,lookupname,lookupmatch,sequence,lookuphash,1,injection)
if ok then
done = true
success = true
end
end
else
-- message
end
end
end
end
while start do
local id = getid(start)
if id == glyph_code then
if getfont(start) == font and getsubtype(start) < 256 then -- why a 256 test ...
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local char = getchar(start)
local lookupmatch = lookupcache[char]
if lookupmatch then
-- sequence kan weg
local ok
head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,1)
if ok then
success = true
elseif gpossing and zwnjruns and char == zwnj then
discrun(start,d_run)
end
elseif gpossing and zwnjruns and char == zwnj then
discrun(start,d_run)
end
if start then start = getnext(start) end
else
start = getnext(start)
end
else
start = getnext(start)
end
elseif id == disc_code then
if gpossing then
kernrun(start,k_run)
start = getnext(start)
elseif typ == "gsub_ligature" then
start = testrun(start,t_run,c_run)
else
comprun(start,c_run)
start = getnext(start)
end
elseif id == math_code then
start = getnext(end_of_math(start))
elseif id == dir_code then
local dir = getfield(start,"dir")
if dir == "+TLT" then
topstack = topstack + 1
dirstack[topstack] = dir
rlmode = 1
elseif dir == "+TRT" then
topstack = topstack + 1
dirstack[topstack] = dir
rlmode = -1
elseif dir == "-TLT" or dir == "-TRT" then
topstack = topstack - 1
rlmode = dirstack[topstack] == "+TRT" and -1 or 1
else
rlmode = rlparmode
end
if trace_directions then
report_process("directions after txtdir %a: parmode %a, txtmode %a, # stack %a, new dir %a",dir,rlparmode,rlmode,topstack,newdir)
end
start = getnext(start)
elseif id == localpar_code then
local dir = getfield(start,"dir")
if dir == "TRT" then
rlparmode = -1
elseif dir == "TLT" then
rlparmode = 1
else
rlparmode = 0
end
-- one might wonder if the par dir should be looked at, so we might as well drop the next line
rlmode = rlparmode
if trace_directions then
report_process("directions after pardir %a: parmode %a, txtmode %a",dir,rlparmode,rlmode)
end
start = getnext(start)
else
start = getnext(start)
end
end
end
else
local function c_run(head)
local done = false
local start = sweephead[head]
if start then
sweephead[head] = nil
else
start = head
end
while start do
local id = getid(start)
if id ~= glyph_code then
-- very unlikely
start = getnext(start)
elseif getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local char = getchar(start)
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
-- we could move all code inline but that makes things even more unreadable
local ok
head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,i)
if ok then
done = true
break
elseif not start then
-- don't ask why ... shouldn't happen
break
end
end
else
report_missing_cache(typ,lookupname)
end
end
if start then start = getnext(start) end
else
start = getnext(start)
end
else
return head, false
end
end
if done then
success = true
end
return head, done
end
local function d_run(prev)
local a = getattr(prev,0)
if a then
a = (a == attr) and (not attribute or getprop(prev,a_state) == attribute)
else
a = not attribute or getprop(prev,a_state) == attribute
end
if a then
-- brr prev can be disc
local char = getchar(prev)
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
-- we could move all code inline but that makes things even more unreadable
local h, d, ok = handler(head,prev,kind,lookupname,lookupmatch,sequence,lookuphash,i)
if ok then
done = true
break
end
end
else
report_missing_cache(typ,lookupname)
end
end
end
end
local function k_run(sub,injection,last)
local a = getattr(sub,0)
if a then
a = (a == attr) and (not attribute or getprop(sub,a_state) == attribute)
else
a = not attribute or getprop(sub,a_state) == attribute
end
if a then
for n in traverse_nodes(sub) do -- only gpos
if n == last then
break
end
local id = getid(n)
if id == glyph_code then
local char = getchar(n)
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
local h, d, ok = handler(head,n,kind,lookupname,lookupmatch,sequence,lookuphash,i,injection)
if ok then
done = true
break
end
end
else
report_missing_cache(typ,lookupname)
end
end
else
-- message
end
end
end
end
local function t_run(start,stop)
while start ~= stop do
local id = getid(start)
if id == glyph_code and getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
local char = getchar(start)
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local lookupmatch = lookupcache[char]
if lookupmatch then
-- if we need more than ligatures we can outline the code and use functions
local s = getnext(start)
local l = nil
while s do
local lg = lookupmatch[getchar(s)]
if lg then
l = lg
s = getnext(s)
else
break
end
end
if l and l.ligature then
return true
end
end
else
report_missing_cache(typ,lookupname)
end
end
end
start = getnext(start)
else
break
end
end
end
while start do
local id = getid(start)
if id == glyph_code then
if getfont(start) == font and getsubtype(start) < 256 then
local a = getattr(start,0)
if a then
a = (a == attr) and (not attribute or getprop(start,a_state) == attribute)
else
a = not attribute or getprop(start,a_state) == attribute
end
if a then
for i=1,ns do
local lookupname = subtables[i]
local lookupcache = lookuphash[lookupname]
if lookupcache then
local char = getchar(start)
local lookupmatch = lookupcache[char]
if lookupmatch then
-- we could move all code inline but that makes things even more unreadable
local ok
head, start, ok = handler(head,start,kind,lookupname,lookupmatch,sequence,lookuphash,i)
if ok then
success = true
break
elseif not start then
-- don't ask why ... shouldn't happen
break
elseif gpossing and zwnjruns and char == zwnj then
discrun(start,d_run)
end
elseif gpossing and zwnjruns and char == zwnj then
discrun(start,d_run)
end
else
report_missing_cache(typ,lookupname)
end
end
if start then start = getnext(start) end
else
start = getnext(start)
end
else
start = getnext(start)
end
elseif id == disc_code then
if gpossing then
kernrun(start,k_run)
start = getnext(start)
elseif typ == "gsub_ligature" then
start = testrun(start,t_run,c_run)
else
comprun(start,c_run)
start = getnext(start)
end
elseif id == math_code then
start = getnext(end_of_math(start))
elseif id == dir_code then
local dir = getfield(start,"dir")
if dir == "+TLT" then
topstack = topstack + 1
dirstack[topstack] = dir
rlmode = 1
elseif dir == "+TRT" then
topstack = topstack + 1
dirstack[topstack] = dir
rlmode = -1
elseif dir == "-TLT" or dir == "-TRT" then
topstack = topstack - 1
rlmode = dirstack[topstack] == "+TRT" and -1 or 1
else
rlmode = rlparmode
end
if trace_directions then
report_process("directions after txtdir %a: parmode %a, txtmode %a, # stack %a, new dir %a",dir,rlparmode,rlmode,topstack,newdir)
end
start = getnext(start)
elseif id == localpar_code then
local dir = getfield(start,"dir")
if dir == "TRT" then
rlparmode = -1
elseif dir == "TLT" then
rlparmode = 1
else
rlparmode = 0
end
rlmode = rlparmode
if trace_directions then
report_process("directions after pardir %a: parmode %a, txtmode %a",dir,rlparmode,rlmode)
end
start = getnext(start)
else
start = getnext(start)
end
end
end
end
if success then
done = true
end
if trace_steps then -- ?
registerstep(head)
end
end
head = tonode(head)
return head, done
end
-- this might move to the loader
local function generic(lookupdata,lookupname,unicode,lookuphash)
local target = lookuphash[lookupname]
if target then
target[unicode] = lookupdata
else
lookuphash[lookupname] = { [unicode] = lookupdata }
end
end
local function ligature(lookupdata,lookupname,unicode,lookuphash)
local target = lookuphash[lookupname]
if not target then
target = { }
lookuphash[lookupname] = target
end
for i=1,#lookupdata do
local li = lookupdata[i]
local tu = target[li]
if not tu then
tu = { }
target[li] = tu
end
target = tu
end
target.ligature = unicode
end
local function pair(lookupdata,lookupname,unicode,lookuphash)
local target = lookuphash[lookupname]
if not target then
target = { }
lookuphash[lookupname] = target
end
local others = target[unicode]
local paired = lookupdata[1]
if others then
others[paired] = lookupdata
else
others = { [paired] = lookupdata }
target[unicode] = others
end
end
local action = {
substitution = generic,
multiple = generic,
alternate = generic,
position = generic,
ligature = ligature,
pair = pair,
kern = pair,
}
local function prepare_lookups(tfmdata)
local rawdata = tfmdata.shared.rawdata
local resources = rawdata.resources
local lookuphash = resources.lookuphash
local anchor_to_lookup = resources.anchor_to_lookup
local lookup_to_anchor = resources.lookup_to_anchor
local lookuptypes = resources.lookuptypes
local characters = tfmdata.characters
local descriptions = tfmdata.descriptions
local duplicates = resources.duplicates
-- we cannot free the entries in the descriptions as sometimes we access
-- then directly (for instance anchors) ... selectively freeing does save
-- much memory as it's only a reference to a table and the slot in the
-- description hash is not freed anyway
-- we can delay this using metatables so that we don't make the hashes for
-- features we don't use but then we need to loop over the characters
-- many times so we gain nothing
for unicode, character in next, characters do -- we cannot loop over descriptions !
local description = descriptions[unicode]
if description then
local lookups = description.slookups
if lookups then
for lookupname, lookupdata in next, lookups do
action[lookuptypes[lookupname]](lookupdata,lookupname,unicode,lookuphash,duplicates)
end
end
local lookups = description.mlookups
if lookups then
for lookupname, lookuplist in next, lookups do
local lookuptype = lookuptypes[lookupname]
for l=1,#lookuplist do
local lookupdata = lookuplist[l]
action[lookuptype](lookupdata,lookupname,unicode,lookuphash,duplicates)
end
end
end
local list = description.kerns
if list then
for lookup, krn in next, list do -- ref to glyph, saves lookup
local target = lookuphash[lookup]
if target then
target[unicode] = krn
else
lookuphash[lookup] = { [unicode] = krn }
end
end
end
local list = description.anchors
if list then
for typ, anchors in next, list do -- types
if typ == "mark" or typ == "cexit" then -- or entry?
for name, anchor in next, anchors do
local lookups = anchor_to_lookup[name]
if lookups then
for lookup in next, lookups do
local target = lookuphash[lookup]
if target then
target[unicode] = anchors
else
lookuphash[lookup] = { [unicode] = anchors }
end
end
end
end
end
end
end
end
end
end
-- so far
local function split(replacement,original)
local result = { }
for i=1,#replacement do
result[original[i]] = replacement[i]
end
return result
end
local valid = { -- does contextpos work?
coverage = { chainsub = true, chainpos = true, contextsub = true, contextpos = true },
reversecoverage = { reversesub = true },
glyphs = { chainsub = true, chainpos = true, contextsub = true, contextpos = true },
}
local function prepare_contextchains(tfmdata)
local rawdata = tfmdata.shared.rawdata
local resources = rawdata.resources
local lookuphash = resources.lookuphash
local lookuptags = resources.lookuptags
local lookups = rawdata.lookups
if lookups then
for lookupname, lookupdata in next, rawdata.lookups do
local lookuptype = lookupdata.type
if lookuptype then
local rules = lookupdata.rules
if rules then
local format = lookupdata.format
local validformat = valid[format]
if not validformat then
report_prepare("unsupported format %a",format)
elseif not validformat[lookuptype] then
-- todo: dejavu-serif has one (but i need to see what use it has)
report_prepare("unsupported format %a, lookuptype %a, lookupname %a",format,lookuptype,lookuptags[lookupname])
else
local contexts = lookuphash[lookupname]
if not contexts then
contexts = { }
lookuphash[lookupname] = contexts
end
local t, nt = { }, 0
for nofrules=1,#rules do
local rule = rules[nofrules]
local current = rule.current
local before = rule.before
local after = rule.after
local replacements = rule.replacements
local sequence = { }
local nofsequences = 0
-- Eventually we can store start, stop and sequence in the cached file
-- but then less sharing takes place so best not do that without a lot
-- of profiling so let's forget about it.
if before then
for n=1,#before do
nofsequences = nofsequences + 1
sequence[nofsequences] = before[n]
end
end
local start = nofsequences + 1
for n=1,#current do
nofsequences = nofsequences + 1
sequence[nofsequences] = current[n]
end
local stop = nofsequences
if after then
for n=1,#after do
nofsequences = nofsequences + 1
sequence[nofsequences] = after[n]
end
end
if sequence[1] then
-- Replacements only happen with reverse lookups as they are single only. We
-- could pack them into current (replacement value instead of true) and then
-- use sequence[start] instead but it's somewhat ugly.
nt = nt + 1
t[nt] = { nofrules, lookuptype, sequence, start, stop, rule.lookups, replacements }
for unic in next, sequence[start] do
local cu = contexts[unic]
if not cu then
contexts[unic] = t
end
end
end
end
end
else
-- no rules
end
else
report_prepare("missing lookuptype for lookupname %a",lookuptags[lookupname])
end
end
end
end
-- we can consider lookuphash == false (initialized but empty) vs lookuphash == table
local function featuresinitializer(tfmdata,value)
if true then -- value then
-- beware we need to use the topmost properties table
local rawdata = tfmdata.shared.rawdata
local properties = rawdata.properties
if not properties.initialized then
local starttime = trace_preparing and os.clock()
local resources = rawdata.resources
resources.lookuphash = resources.lookuphash or { }
prepare_contextchains(tfmdata)
prepare_lookups(tfmdata)
properties.initialized = true
if trace_preparing then
report_prepare("preparation time is %0.3f seconds for %a",os.clock()-starttime,tfmdata.properties.fullname)
end
end
end
end
registerotffeature {
name = "features",
description = "features",
default = true,
initializers = {
position = 1,
node = featuresinitializer,
},
processors = {
node = featuresprocessor,
}
}
-- This can be used for extra handlers, but should be used with care!
otf.handlers = handlers
|