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
|
% \iffalse meta-comment
%
%% File: l3file.dtx
%
% Copyright (C) 1990-2019 The LaTeX3 Project
%
% It may be distributed and/or modified under the conditions of the
% LaTeX Project Public License (LPPL), either version 1.3c of this
% license or (at your option) any later version. The latest version
% of this license is in the file
%
% https://www.latex-project.org/lppl.txt
%
% This file is part of the "l3kernel bundle" (The Work in LPPL)
% and all files in that bundle must be distributed together.
%
% -----------------------------------------------------------------------
%
% The development version of the bundle can be found at
%
% https://github.com/latex3/latex3
%
% for those people who are interested.
%
%<*driver>
\documentclass[full,kernel]{l3doc}
\begin{document}
\DocInput{\jobname.dtx}
\PrintIndex
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \pkg{l3file} package\\ File and I/O operations^^A
% }
%
% \author{^^A
% The \LaTeX3 Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released 2019-10-21}
%
% \maketitle
%
% \begin{documentation}
%
% This module provides functions for working with external files. Some of these
% functions apply to an entire file, and have prefix \cs[no-index]{file_\ldots}, while
% others are used to work with files on a line by line basis and have prefix
% \cs[no-index]{ior_\ldots} (reading) or \cs[no-index]{iow_\ldots} (writing).
%
% It is important to remember that when reading external files \TeX{}
% attempts to locate them using both the operating system path and entries in the
% \TeX{} file database (most \TeX{} systems use such a database). Thus the
% \enquote{current path} for \TeX{} is somewhat broader than that for other
% programs.
%
% For functions which expect a \meta{file name} argument, this argument
% may contain both literal items and expandable content, which should on
% full expansion be the desired file name. Active characters (as
% declared in \cs{l_char_active_seq}) are \emph{not} expanded,
% allowing the direct use of these in file names. File names are quoted
% using |"| tokens if they contain spaces: as a result, |"| tokens are
% \emph{not} permitted in file names.
%
% Spaces are trimmed at the beginning and end of the file name:
% this reflects the fact that some file systems do not allow or interact
% unpredictably with spaces in these positions. When no extension is given,
% this will trim spaces from the start of the name only.
%
% \section{Input--output stream management}
%
% As \TeX{} engines have a limited number of input and output streams, direct
% use of the streams by the programmer is not supported in \LaTeX3. Instead, an
% internal pool of streams is maintained, and these are allocated and
% deallocated as needed by other modules. As a result, the programmer should
% close streams when they are no longer needed, to release them for other
% processes.
%
% Note that I/O operations are global: streams should all be declared
% with global names and treated accordingly.
%
% \begin{function}[added = 2011-09-26, updated = 2011-12-27]
% {\ior_new:N, \ior_new:c, \iow_new:N, \iow_new:c}
% \begin{syntax}
% \cs{ior_new:N} \meta{stream}
% \cs{iow_new:N} \meta{stream}
% \end{syntax}
% Globally reserves the name of the \meta{stream}, either for reading
% or for writing as appropriate. The \meta{stream} is not opened until
% the appropriate \cs[no-index]{\ldots_open:Nn} function is used. Attempting to
% use a \meta{stream} which has not been opened is an error, and the
% \meta{stream} will behave as the corresponding \cs[no-index]{c_term_\ldots}.
% \end{function}
%
% \begin{function}[updated = 2012-02-10]{\ior_open:Nn, \ior_open:cn}
% \begin{syntax}
% \cs{ior_open:Nn} \meta{stream} \Arg{file name}
% \end{syntax}
% Opens \meta{file name} for reading using \meta{stream} as the
% control sequence for file access. If the \meta{stream} was already
% open it is closed before the new operation begins. The
% \meta{stream} is available for access immediately and will remain
% allocated to \meta{file name} until a \cs{ior_close:N} instruction
% is given or the \TeX{} run ends.
% If the file is not found, an error is raised.
% \end{function}
%
% \begin{function}[added = 2013-01-12, TF]{\ior_open:Nn, \ior_open:cn}
% \begin{syntax}
% \cs{ior_open:NnTF} \meta{stream} \Arg{file name} \Arg{true code} \Arg{false code}
% \end{syntax}
% Opens \meta{file name} for reading using \meta{stream} as the
% control sequence for file access. If the \meta{stream} was already
% open it is closed before the new operation begins. The
% \meta{stream} is available for access immediately and will remain
% allocated to \meta{file name} until a \cs{ior_close:N} instruction
% is given or the \TeX{} run ends. The \meta{true code} is then inserted
% into the input stream. If the file is not found, no error is raised and
% the \meta{false code} is inserted into the input stream.
% \end{function}
%
% \begin{function}[updated = 2012-02-09]{\iow_open:Nn, \iow_open:cn}
% \begin{syntax}
% \cs{iow_open:Nn} \meta{stream} \Arg{file name}
% \end{syntax}
% Opens \meta{file name} for writing using \meta{stream} as the
% control sequence for file access. If the \meta{stream} was already
% open it is closed before the new operation begins. The
% \meta{stream} is available for access immediately and will remain
% allocated to \meta{file name} until a \cs{iow_close:N} instruction
% is given or the \TeX{} run ends. Opening a file for writing clears
% any existing content in the file (\emph{i.e.}~writing is \emph{not}
% additive).
% \end{function}
%
% \begin{function}[updated = 2012-07-31]
% {\ior_close:N, \ior_close:c, \iow_close:N, \iow_close:c}
% \begin{syntax}
% \cs{ior_close:N} \meta{stream}
% \cs{iow_close:N} \meta{stream}
% \end{syntax}
% Closes the \meta{stream}. Streams should always be closed when
% they are finished with as this ensures that they remain available
% to other programmers.
% \end{function}
%
% \begin{function}[added = 2017-06-27]
% {
% \ior_show_list:, \ior_log_list:,
% \iow_show_list:, \iow_log_list:
% }
% \begin{syntax}
% \cs{ior_show_list:}
% \cs{ior_log_list:}
% \cs{iow_show_list:}
% \cs{iow_log_list:}
% \end{syntax}
% Display (to the terminal or log file) a list of the file names
% associated with each open (read or write) stream. This is intended
% for tracking down problems.
% \end{function}
%
% \subsection{Reading from files}
%
% Reading from files and reading from the terminal are separate processes in
% \pkg{expl3}. The functions \cs{ior_get:NN} and \cs{ior_str_get:NN}, and their
% branching equivalents, are designed to work with \emph{files}.
%
% \begin{function}[noTF, added = 2012-06-24, updated = 2019-03-23]{\ior_get:NN}
% \begin{syntax}
% \cs{ior_get:NN} \meta{stream} \meta{token list variable}
% \cs{ior_get:NNTF} \meta{stream} \meta{token list variable} \meta{true code} \meta{false code}
% \end{syntax}
% Function that reads one or more lines (until an equal number of left
% and right braces are found) from the file input \meta{stream} and stores
% the result locally in the \meta{token list} variable.
% The material read from the \meta{stream} is tokenized by \TeX{}
% according to the category codes and \tn{endlinechar} in force when
% the function is used. Assuming normal settings, any lines which do
% not end in a comment character~|%| have the line ending
% converted to a space, so for example input
% \begin{verbatim}
% a b c
% \end{verbatim}
% results in a token list \verb*|a b c |. Any blank line is
% converted to the token \cs{par}. Therefore, blank lines can be
% skipped by using a test such as
% \begin{verbatim}
% \ior_get:NN \l_my_stream \l_tmpa_tl
% \tl_set:Nn \l_tmpb_tl { \par }
% \tl_if_eq:NNF \l_tmpa_tl \l_tmpb_tl
% ...
% \end{verbatim}
% Also notice that if multiple lines are read to match braces
% then the resulting token list can contain \cs{par} tokens.
% In the non-branching version, where the \meta{stream} is not open
% the \meta{tl var} is set to \cs{q_no_value}.
% \begin{texnote}
% This protected macro is a wrapper around the \TeX{} primitive
% \tn{read}. Regardless of settings, \TeX{} replaces trailing space
% and tab characters (character codes 32 and~9) in each line by an
% end-of-line character (character code \tn{endlinechar}, omitted if
% \tn{endlinechar} is negative or too large) before turning
% characters into tokens according to current category codes. With
% default settings, spaces appearing at the beginning of lines are
% also ignored.
% \end{texnote}
% \end{function}
%
% \begin{function}[noTF, added = 2016-12-04, updated = 2019-03-23]
% {\ior_str_get:NN}
% \begin{syntax}
% \cs{ior_str_get:NN} \meta{stream} \meta{token list variable}
% \cs{ior_str_get:NNTF} \meta{stream} \meta{token list variable} \meta{true code} \meta{false code}
% \end{syntax}
% Function that reads one line from the file input \meta{stream} and stores
% the result locally in the \meta{token list} variable.
% The material is read from the \meta{stream} as a series of tokens with
% category code $12$ (other), with the exception of space
% characters which are given category code $10$ (space).
% Multiple whitespace characters are retained by this process. It
% always only reads one line and any blank lines in the input
% result in the \meta{token list variable} being empty. Unlike
% \cs{ior_get:NN}, line ends do not receive any special treatment. Thus
% input
% \begin{verbatim}
% a b c
% \end{verbatim}
% results in a token list |a b c| with the letters |a|, |b|, and |c|
% having category code~12.
% In the non-branching version, where the\meta{stream} is not open
% the \meta{tl var} is set to \cs{q_no_value}.
% \begin{texnote}
% This protected macro is a wrapper around the \eTeX{} primitive
% \tn{readline}. Regardless of settings, \TeX{} removes trailing
% space and tab characters (character codes 32 and~9). However, the
% end-line character normally added by this primitive is not
% included in the result of \cs{ior_str_get:NN}.
% \end{texnote}
% \end{function}
%
% All mappings are done at the current group level, \emph{i.e.}~any
% local assignments made by the \meta{function} or \meta{code} discussed
% below remain in effect after the loop.
%
% \begin{function}[added = 2012-02-11]{\ior_map_inline:Nn}
% \begin{syntax}
% \cs{ior_map_inline:Nn} \meta{stream} \Arg{inline function}
% \end{syntax}
% Applies the \meta{inline function} to each set of \meta{lines}
% obtained by calling \cs{ior_get:NN} until reaching the end of the
% file. \TeX{} ignores any trailing new-line marker from the file it
% reads. The \meta{inline function} should consist of code which
% receives the \meta{line} as |#1|.
% \end{function}
%
% \begin{function}[added = 2012-02-11]{\ior_str_map_inline:Nn}
% \begin{syntax}
% \cs{ior_str_map_inline:Nn} \meta{stream} \Arg{inline function}
% \end{syntax}
% Applies the \meta{inline function} to every \meta{line}
% in the \meta{stream}. The material is read from the \meta{stream}
% as a series of tokens with category code $12$ (other), with the
% exception of space characters which are given category code $10$
% (space). The \meta{inline function} should consist of code which
% receives the \meta{line} as |#1|.
% Note that \TeX{} removes trailing space and tab characters
% (character codes 32 and 9) from every line upon input. \TeX{} also
% ignores any trailing new-line marker from the file it reads.
% \end{function}
%
% \begin{function}[added = 2019-01-13]{\ior_map_variable:NNn}
% \begin{syntax}
% \cs{ior_map_variable:NNn} \meta{stream} \meta{tl~var} \Arg{code}
% \end{syntax}
% For each set of \meta{lines} obtained by calling \cs{ior_get:NN}
% until reaching the end of the file, stores the \meta{lines} in the
% \meta{tl~var} then applies the \meta{code}. The \meta{code} will
% usually make use of the \meta{variable}, but this is not enforced.
% The assignments to the \meta{variable} are local.
% Its value after the loop is the last set of \meta{lines}, or its
% original value if the \meta{stream} is empty. \TeX{} ignores
% any trailing new-line marker from the file it reads.
% This function is typically faster than \cs{ior_map_inline:Nn}.
% \end{function}
%
% \begin{function}[added = 2019-01-13]{\ior_str_map_variable:NNn}
% \begin{syntax}
% \cs{ior_str_map_variable:NNn} \meta{stream} \meta{variable} \Arg{code}
% \end{syntax}
% For each \meta{line} in the \meta{stream}, stores the \meta{line} in
% the \meta{variable} then applies the \meta{code}. The material is
% read from the \meta{stream} as a series of tokens with category code
% $12$ (other), with the exception of space characters which are given
% category code $10$ (space). The \meta{code} will usually make use
% of the \meta{variable}, but this is not enforced. The assignments
% to the \meta{variable} are local. Its value after the loop is the
% last \meta{line}, or its original value if the \meta{stream} is
% empty. Note that \TeX{} removes trailing
% space and tab characters (character codes 32 and 9) from every line
% upon input. \TeX{} also ignores any trailing new-line marker from
% the file it reads.
% This function is typically faster than \cs{ior_str_map_inline:Nn}.
% \end{function}
%
% \begin{function}[added = 2012-06-29]{\ior_map_break:}
% \begin{syntax}
% \cs{ior_map_break:}
% \end{syntax}
% Used to terminate a \cs[no-index]{ior_map_\ldots} function before all
% lines from the \meta{stream} have been processed. This
% normally takes place within a conditional statement, for example
% \begin{verbatim}
% \ior_map_inline:Nn \l_my_ior
% {
% \str_if_eq:nnTF { #1 } { bingo }
% { \ior_map_break: }
% {
% % Do something useful
% }
% }
% \end{verbatim}
% Use outside of a \cs[no-index]{ior_map_\ldots} scenario leads to low
% level \TeX{} errors.
% \begin{texnote}
% When the mapping is broken, additional tokens may be inserted
% before further items are taken
% from the input stream. This depends on the design of the mapping
% function.
% \end{texnote}
% \end{function}
%
% \begin{function}[added = 2012-06-29]{\ior_map_break:n}
% \begin{syntax}
% \cs{ior_map_break:n} \Arg{code}
% \end{syntax}
% Used to terminate a \cs[no-index]{ior_map_\ldots} function before all
% lines in the \meta{stream} have been processed, inserting
% the \meta{code} after the mapping has ended. This
% normally takes place within a conditional statement, for example
% \begin{verbatim}
% \ior_map_inline:Nn \l_my_ior
% {
% \str_if_eq:nnTF { #1 } { bingo }
% { \ior_map_break:n { <code> } }
% {
% % Do something useful
% }
% }
% \end{verbatim}
% Use outside of a \cs[no-index]{ior_map_\ldots} scenario leads to low
% level \TeX{} errors.
% \begin{texnote}
% When the mapping is broken, additional tokens may be inserted
% before the \meta{code} is
% inserted into the input stream.
% This depends on the design of the mapping function.
% \end{texnote}
% \end{function}
%
% \begin{function}[updated = 2012-02-10, EXP, pTF]{\ior_if_eof:N}
% \begin{syntax}
% \cs{ior_if_eof_p:N} \meta{stream} \\
% \cs{ior_if_eof:NTF} \meta{stream} \Arg{true code} \Arg{false code}
% \end{syntax}
% Tests if the end of a file \meta{stream} has been reached during a reading
% operation. The test also returns a \texttt{true} value if
% the \meta{stream} is not open.
% \end{function}
%
% \subsection{Writing to files}
%
% \begin{function}[updated = 2012-06-05]{\iow_now:Nn, \iow_now:Nx, \iow_now:cn, \iow_now:cx}
% \begin{syntax}
% \cs{iow_now:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This functions writes \meta{tokens} to the specified
% \meta{stream} immediately (\emph{i.e.}~the write operation is called
% on expansion of \cs{iow_now:Nn}).
% \end{function}
%
% \begin{function}{\iow_log:n, \iow_log:x}
% \begin{syntax}
% \cs{iow_log:n} \Arg{tokens}
% \end{syntax}
% This function writes the given \meta{tokens} to the log (transcript)
% file immediately: it is a dedicated version of \cs{iow_now:Nn}.
% \end{function}
%
% \begin{function}{\iow_term:n, \iow_term:x}
% \begin{syntax}
% \cs{iow_term:n} \Arg{tokens}
% \end{syntax}
% This function writes the given \meta{tokens} to the terminal
% file immediately: it is a dedicated version of \cs{iow_now:Nn}.
% \end{function}
%
% \begin{function}
% {
% \iow_shipout:Nn, \iow_shipout:Nx,
% \iow_shipout:cn, \iow_shipout:cx
% }
% \begin{syntax}
% \cs{iow_shipout:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This functions writes \meta{tokens} to the specified
% \meta{stream} when the current page is finalised (\emph{i.e.}~at
% shipout). The \texttt{x}-type variants expand the \meta{tokens}
% at the point where the function is used but \emph{not} when the
% resulting tokens are written to the \meta{stream}
% (\emph{cf.}~\cs{iow_shipout_x:Nn}).
% \begin{texnote}
% When using \pkg{expl3} with a format other than \LaTeX{}, new line
% characters inserted using \cs{iow_newline:} or using the
% line-wrapping code \cs{iow_wrap:nnnN} are not recognized in
% the argument of \cs{iow_shipout:Nn}. This may lead to the
% insertion of additional unwanted line-breaks.
% \end{texnote}
% \end{function}
%
% \begin{function}[updated = 2012-09-08]
% {
% \iow_shipout_x:Nn, \iow_shipout_x:Nx,
% \iow_shipout_x:cn, \iow_shipout_x:cx
% }
% \begin{syntax}
% \cs{iow_shipout_x:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This functions writes \meta{tokens} to the specified
% \meta{stream} when the current page is finalised (\emph{i.e.}~at
% shipout). The \meta{tokens} are expanded at the time of writing
% in addition to any expansion when the function is used. This makes
% these functions suitable for including material finalised during
% the page building process (such as the page number integer).
% \begin{texnote}
% This is a wrapper around the \TeX{} primitive \tn{write}.
% When using \pkg{expl3} with a format other than \LaTeX{}, new line
% characters inserted using \cs{iow_newline:} or using the
% line-wrapping code \cs{iow_wrap:nnnN} are not recognized in
% the argument of \cs{iow_shipout:Nn}. This may lead to the
% insertion of additional unwanted line-breaks.
% \end{texnote}
% \end{function}
%
% \begin{function}[EXP]{\iow_char:N}
% \begin{syntax}
% \cs{iow_char:N} |\|\meta{char}
% \end{syntax}
% Inserts \meta{char} into the output stream. Useful when trying to
% write difficult characters such as |%|, |{|, |}|,
% \emph{etc.}~in messages, for example:
% \begin{verbatim}
% \iow_now:Nx \g_my_iow { \iow_char:N \{ text \iow_char:N \} }
% \end{verbatim}
% The function has no effect if writing is taking place without
% expansion (\emph{e.g.}~in the second argument of \cs{iow_now:Nn}).
% \end{function}
%
% \begin{function}[EXP]{\iow_newline:}
% \begin{syntax}
% \cs{iow_newline:}
% \end{syntax}
% Function to add a new line within the \meta{tokens} written to a
% file. The function has no effect if writing is taking place without
% expansion (\emph{e.g.}~in the second argument of \cs{iow_now:Nn}).
% \begin{texnote}
% When using \pkg{expl3} with a format other than \LaTeX{}, the
% character inserted by \cs{iow_newline:} is not recognized by
% \TeX{}, which may lead to the insertion of additional unwanted
% line-breaks. This issue only affects \cs{iow_shipout:Nn},
% \cs{iow_shipout_x:Nn} and direct uses of primitive operations.
% \end{texnote}
% \end{function}
%
% \subsection{Wrapping lines in output}
%
% \begin{function}[added = 2012-06-28, updated = 2017-12-04]
% {\iow_wrap:nnnN, \iow_wrap:nxnN}
% \begin{syntax}
% \cs{iow_wrap:nnnN} \Arg{text} \Arg{run-on text} \Arg{set up} \meta{function}
% \end{syntax}
% This function wraps the \meta{text} to a fixed number of
% characters per line. At the start of each line which is wrapped,
% the \meta{run-on text} is inserted. The line character count
% targeted is the value of \cs{l_iow_line_count_int} minus the
% number of characters in the \meta{run-on text} for all lines except
% the first, for which the target number of characters is simply
% \cs{l_iow_line_count_int} since there is no run-on text. The
% \meta{text} and \meta{run-on text} are exhaustively expanded by the
% function, with the following substitutions:
% \begin{itemize}
% \item |\\| or \cs{iow_newline:} may be used to force a new line,
% \item \verb*|\ | may be used to represent a forced space
% (for example after a control sequence),
% \item |\#|, |\%|, |\{|, |\}|, |\~| may be used to represent
% the corresponding character,
% \item \cs{iow_allow_break:} may be used to allow a line-break
% without inserting a space (this is experimental),
% \item \cs{iow_indent:n} may be used to indent a part of the
% \meta{text} (not the \meta{run-on text}).
% \end{itemize}
% Additional functions may be added to the wrapping by using the
% \meta{set up}, which is executed before the wrapping takes place: this
% may include overriding the substitutions listed.
%
% Any expandable material in the \meta{text} which is not to be expanded
% on wrapping should be converted to a string using \cs{token_to_str:N},
% \cs{tl_to_str:n}, \cs{tl_to_str:N}, \emph{etc.}
%
% The result of the wrapping operation is passed as a braced argument to the
% \meta{function}, which is typically a wrapper around a write
% operation. The output of \cs{iow_wrap:nnnN} (\emph{i.e.}~the argument
% passed to the \meta{function}) consists of characters of category
% \enquote{other} (category code~12), with the exception of spaces which
% have category \enquote{space} (category code~10). This means that the
% output does \emph{not} expand further when written to a file.
%
% \begin{texnote}
% Internally, \cs{iow_wrap:nnnN} carries out an \texttt{x}-type expansion
% on the \meta{text} to expand it. This is done in such a way that
% \cs{exp_not:N} or \cs{exp_not:n} \emph{could} be used to prevent
% expansion of material. However, this is less conceptually clear than
% conversion to a string, which is therefore the supported method for
% handling expandable material in the \meta{text}.
% \end{texnote}
% \end{function}
%
% \begin{function}[added = 2011-09-21]{\iow_indent:n}
% \begin{syntax}
% \cs{iow_indent:n} \Arg{text}
% \end{syntax}
% In the first argument of \cs{iow_wrap:nnnN} (for instance in messages),
% indents \meta{text} by four spaces. This function does not cause
% a line break, and only affects lines which start within the scope
% of the \meta{text}. In case the indented \meta{text} should appear
% on separate lines from the surrounding text, use |\\| to force
% line breaks.
% \end{function}
%
% \begin{variable}[added = 2012-06-24]{\l_iow_line_count_int}
% The maximum number of characters in a line to be written
% by the \cs{iow_wrap:nnnN}
% function. This value depends on the \TeX{} system in use: the standard
% value is $78$, which is typically correct for unmodified \TeX{}live
% and \hologo{MiKTeX} systems.
% \end{variable}
%
% \subsection{Constant input--output streams, and variables}
%
% \begin{variable}[added = 2017-12-11]{\g_tmpa_ior, \g_tmpb_ior}
% Scratch input stream for global use. These are never used by
% the kernel code, and so are safe for use with any \LaTeX3-defined
% function. However, they may be overwritten by other non-kernel
% code and so should only be used for short-term storage.
% \end{variable}
%
% \begin{variable}{\c_log_iow, \c_term_iow}
% Constant output streams for writing to the log and to the terminal
% (plus the log), respectively.
% \end{variable}
%
% \begin{variable}[added = 2017-12-11]{\g_tmpa_iow, \g_tmpb_iow}
% Scratch output stream for global use. These are never used by
% the kernel code, and so are safe for use with any \LaTeX3-defined
% function. However, they may be overwritten by other non-kernel
% code and so should only be used for short-term storage.
% \end{variable}
%
% \subsection{Primitive conditionals}
%
% \begin{function}[EXP]{\if_eof:w}
% \begin{syntax}
% \cs{if_eof:w} \meta{stream}
% ~~\meta{true code}
% \cs{else:}
% ~~\meta{false code}
% \cs{fi:}
% \end{syntax}
% Tests if the \meta{stream} returns \enquote{end of file}, which is true
% for non-existent files. The \cs{else:} branch is optional.
% \begin{texnote}
% This is the \TeX{} primitive \tn{ifeof}.
% \end{texnote}
% \end{function}
%
% \section{File operation functions}
%
% \begin{variable}[added = 2017-06-21]
% {
% \g_file_curr_dir_str,
% \g_file_curr_name_str,
% \g_file_curr_ext_str
% }
% Contain the directory, name and extension of the current file. The
% directory is empty if the file was loaded without an explicit
% path (\emph{i.e.}~if it is in the \TeX{} search path), and does
% \emph{not} end in |/| other than the case that it is exactly equal
% to the root directory. The \meta{name} and \meta{ext} parts together
% make up the file name, thus the \meta{name} part may be thought of
% as the \enquote{job name} for the current file. Note that \TeX{} does
% not provide information on the \meta{ext} part for the main (top
% level) file and that this file always has an empty \meta{dir} component.
% Also, the \meta{name} here will be equal to \cs{c_sys_jobname_str},
% which may be different from the real file name (if set using
% |--jobname|, for example).
% \end{variable}
%
% \begin{variable}[added = 2017-06-18]{\l_file_search_path_seq}
% Each entry is the path to a directory which should be searched when
% seeking a file. Each path can be relative or absolute, and should
% not include the trailing slash. The entries are not expanded when
% used so may contain active characters but should not feature any
% variable content. Spaces need not be quoted.
%
% \begin{texnote}
% When working as a package in \LaTeXe{}, \pkg{expl3} will
% automatically append the current \tn{input@path} to the
% set of values from \cs{l_file_search_path_seq}.
% \end{texnote}
% \end{variable}
%
% \begin{function}[TF, updated = 2012-02-10]{\file_if_exist:n}
% \begin{syntax}
% \cs{file_if_exist:nTF} \Arg{file name} \Arg{true code} \Arg{false code}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by
% \cs{l_file_search_path_seq}.
% \end{function}
%
% \begin{function}[noTF, added = 2019-01-16, updated = 2019-02-16]{\file_get:nnN}
% \begin{syntax}
% \cs{file_get:nnN} \Arg{filename} \Arg{setup} \meta{tl}
% \cs{file_get:nnNTF} \Arg{filename} \Arg{setup} \meta{tl} \Arg{true code} \Arg{false code}
% \end{syntax}
% Defines \meta{tl} to the contents of \meta{filename}.
% Category codes may need to be set appropriately via the \meta{setup}
% argument.
% The non-branching version sets the \meta{tl} to \cs{q_no_value} if the file is
% not found. The branching version runs the \meta{true code} after the
% assignment to \meta{tl} if the file is found, and \meta{false code}
% otherwise.
% \end{function}
%
% \begin{function}[noTF, updated = 2019-02-16]
% {\file_get_full_name:nN, \file_get_full_name:VN}
% \begin{syntax}
% \cs{file_get_full_name:nN} \Arg{file name} \meta{tl}
% \cs{file_get_full_name:nNTF} \Arg{file name} \meta{tl} \Arg{true code} \Arg{false code}
% \end{syntax}
% Searches for \meta{file name} in the path as detailed for
% \cs{file_if_exist:nTF}, and if found sets the \meta{tl var} the
% fully-qualified name of the file, \emph{i.e.}~the path and file name.
% This includes an extension |.tex| when the given \meta{file name}
% has no extension but the file found has that extension.
% In the non-branching version, the \meta{tl var} will be set to
% \cs{q_no_value} in the case that the file does not exist.
% \end{function}
%
% \begin{function}[added = 2019-09-03, rEXP]{\file_full_name:n, \file_full_name:V}
% \begin{syntax}
% \cs{file_full_name:n} \Arg{file name}
% \end{syntax}
% Searches for \meta{file name} in the path as detailed for
% \cs{file_if_exist:nTF}, and if found leaves the
% fully-qualified name of the file, \emph{i.e.}~the path and file name,
% in the input stream.
% This includes an extension |.tex| when the given \meta{file name}
% has no extension but the file found has that extension.
% If the file is not found on the path, the expansion is empty.
% \end{function}
%
% \begin{function}[added = 2017-06-23, updated = 2017-06-26]
% {\file_parse_full_name:nNNN, \file_parse_full_name:VNNN}
% \begin{syntax}
% \cs{file_parse_full_name:nNNN} \Arg{full name} \meta{dir} \meta{name} \meta{ext}
% \end{syntax}
% Parses the \meta{full name} and splits it into three parts, each of
% which is returned by setting the appropriate local string variable:
% \begin{itemize}
% \item The \meta{dir}: everything up to the last |/| (path separator)
% in the \meta{file path}. As with system \texttt{PATH} variables
% and related functions, the \meta{dir} does \emph{not} include the
% trailing |/| unless it points to the root directory. If there is no path (only
% a file name), \meta{dir} is empty.
% \item The \meta{name}: everything after the last |/| up to the last |.|,
% where both of those characters are optional. The \meta{name} may
% contain multiple |.| characters. It is empty if \meta{full name}
% consists only of a directory name.
% \item The \meta{ext}: everything after the last |.| (including the dot).
% The \meta{ext} is empty if there is no |.| after the last |/|.
% \end{itemize}
% This function does not expand the \meta{full name} before turning it
% to a string. It assume that the \meta{full name} either contains no
% quote (|"|) characters or is surrounded by a pair of quotes.
% \end{function}
%
% \begin{function}[rEXP, added = 2019-09-03]{\file_mdfive_hash:n}
% \begin{syntax}
% \cs{file_mdfive_hash:n} \Arg{file name}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by \cs{l_file_search_path_seq}.
% It then expands to leave the MD5 sum generated from the contents of
% the file in the input stream. The file is read as bytes, which means that in
% contrast to most \TeX{} behaviour there will be a difference in result
% depending on the line endings used in text files. The same file will
% produce the same result between different engines: the algorithm used
% is the same in all cases. When the file is not found, the result of
% expansion is empty.
% \end{function}
%
% \begin{function}[noTF, added = 2017-07-11, updated = 2019-02-16]
% {\file_get_mdfive_hash:nN}
% \begin{syntax}
% \cs{file_get_mdfive_hash:nN} \Arg{file name} \meta{tl var}
% \end{syntax}
% Sets the \meta{tl var} to the result of applying
% \cs{file_mdfive_hash:n} to the \meta{file}. If the file is not found,
% the \meta{tl var} will be set to \cs{q_no_value}.
% \end{function}
%
% \begin{function}[rEXP, added = 2019-09-03]{\file_size:n}
% \begin{syntax}
% \cs{file_size:n} \Arg{file name}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by \cs{l_file_search_path_seq}.
% It then expands to leave the size of the file in bytes in the input stream.
% When the file is not found, the result of expansion is empty.
% \end{function}
%
% \begin{function}[noTF, added = 2017-07-09, updated = 2019-02-16]
% {\file_get_size:nN}
% \begin{syntax}
% \cs{file_get_size:nN} \Arg{file name} \meta{tl var}
% \end{syntax}
% Sets the \meta{tl var} to the result of applying
% \cs{file_size:n} to the \meta{file}. If the file is not found,
% the \meta{tl var} will be set to \cs{q_no_value}.
% This is not available in older versions of \XeTeX{}.
% \end{function}
%
% \begin{function}[rEXP, added = 2019-09-03]{\file_timestamp:n}
% \begin{syntax}
% \cs{file_timestamp:n} \Arg{file name}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by \cs{l_file_search_path_seq}.
% It then expands to leave the modification timestamp of
% the file in the input stream. The timestamp is of the form
% |D:|\meta{year}\meta{month}\meta{day}\meta{hour}^^A
% \meta{minute}\meta{second}\meta{offset}, where the latter may be |Z|
% (UTC) or \meta{plus-minus}\meta{hours}|'|\meta{minutes}|'|.
% When the file is not found, the result of expansion is empty.
% This is not available in older versions of \XeTeX{}.
% \end{function}
%
% \begin{function}[noTF, added = 2017-07-09, updated = 2019-02-16]
% {\file_get_timestamp:nN}
% \begin{syntax}
% \cs{file_get_timestamp:nN} \Arg{file name} \meta{tl var}
% \end{syntax}
% Sets the \meta{tl var} to the result of applying
% \cs{file_timestamp:n} to the \meta{file}. If the file is not found,
% the \meta{tl var} will be set to \cs{q_no_value}.
% This is not available in older versions of \XeTeX{}.
% \end{function}
%
% \begin{function}[added = 2019-05-13, updated = 2019-09-20, pTF, EXP]
% {\file_compare_timestamp:nNn}
% \begin{syntax}
% \cs{file_compare_timestamp:nNn} \Arg{file-1} \meta{comparator} \Arg{file-2} \Arg{true code} \Arg{false code}
% \end{syntax}
% Compares the file stamps on the two \meta{files} as indicated by
% the \meta{comparator}, and inserts either the \meta{true code}
% or \meta{false case} as required. A file which is not found
% is treated as older than any file which is found. This allows for
% example the construct
% \begin{verbatim}
% \file_compare_timestamp:nNnT { source-file } > { derived-file }
% {
% % Code to regenerate derived file
% }
% \end{verbatim}
% to work when the derived file is entirely absent. The timestamp
% of two absent files is regarded as different.
% This is not available in older versions of \XeTeX{}.
% \end{function}
%
%
% \begin{function}[updated = 2017-06-26]{\file_input:n}
% \begin{syntax}
% \cs{file_input:n} \Arg{file name}
% \end{syntax}
% Searches for \meta{file name} in the path as detailed for
% \cs{file_if_exist:nTF}, and if found reads in the file as
% additional \LaTeX{} source. All files read are recorded
% for information and the file name stack is updated by this
% function. An error is raised if the file is not found.
% \end{function}
%
% \begin{function}[added = 2014-07-02]{\file_if_exist_input:n, \file_if_exist_input:nF}
% \begin{syntax}
% \cs{file_if_exist_input:n} \Arg{file name}
% \cs{file_if_exist_input:nF} \Arg{file name} \Arg{false code}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by
% \cs{file_path_include:n}. If found then
% reads in the file as additional \LaTeX{} source as described for
% \cs{file_input:n}, otherwise inserts the \meta{false code}.
% Note that these functions do not raise
% an error if the file is not found, in contrast to \cs{file_input:n}.
% \end{function}
%
% \begin{function}[added = 2017-07-07]{\file_input_stop:}
% \begin{syntax}
% \cs{file_input_stop:}
% \end{syntax}
% Ends the reading of a file started by \cs{file_input:n} or similar before
% the end of the file is reached. Where the file reading is being terminated
% due to an error, \cs[index = msg_critical:nn]{msg_critical:nn(nn)}
% should be preferred.
% \begin{texnote}
% This function must be used on a line on its own: \TeX{} reads files
% line-by-line and so any additional tokens in the \enquote{current} line
% will still be read.
%
% This is also true if the function is hidden inside another function
% (which will be the normal case), i.e., all tokens on the same line
% in the source file are still processed. Putting it on a line by itself
% in the definition doesn't help as it is the line where it is used that
% counts!
% \end{texnote}
% \end{function}
%
% \begin{function}{\file_show_list:, \file_log_list:}
% \begin{syntax}
% \cs{file_show_list:}
% \cs{file_log_list:}
% \end{syntax}
% These functions list all files loaded by \LaTeXe{} commands that
% populate \tn{@filelist} or by \cs{file_input:n}. While
% \cs{file_show_list:} displays the list in the terminal,
% \cs{file_log_list:} outputs it to the log file only.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3file} implementation}
%
% \TestFiles{m3file001}
%
% \begin{macrocode}
%<*initex|package>
% \end{macrocode}
%
% \subsection{Input operations}
%
% \begin{macrocode}
%<@@=ior>
% \end{macrocode}
%
% \subsubsection{Variables and constants}
%
% \begin{variable}{\l_@@_internal_tl}
% Used as a short-term scratch variable.
% \begin{macrocode}
\tl_new:N \l_@@_internal_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\c_@@_term_ior}
% Reading from the terminal (with a prompt) is done using a positive
% but non-existent stream number. Unlike writing, there is no concept
% of reading from the log.
% \begin{macrocode}
\int_const:Nn \c_@@_term_ior { 16 }
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_seq}
% A list of the currently-available input streams to be used as a
% stack. In format mode, all streams (from $0$ to~$15$) are
% available, while the package requests streams to \LaTeXe{} as they
% are needed (initially none are needed), so the starting point
% varies!
% \begin{macrocode}
\seq_new:N \g_@@_streams_seq
%<*initex>
\seq_gset_split:Nnn \g_@@_streams_seq { , }
{ 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 }
%</initex>
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_stream_tl}
% Used to recover the raw stream number from the stack.
% \begin{macrocode}
\tl_new:N \l_@@_stream_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_prop}
% The name of the file attached to each stream is tracked in a property
% list. To get the correct number of reserved streams in package mode the
% underlying mechanism needs to be queried. For \LaTeXe{} and plain \TeX{}
% this data is stored in |\count16|: with the \pkg{etex} package loaded
% we need to subtract $1$ as the register holds the number of the next
% stream to use. In \ConTeXt{}, we need to look at |\count38| but there
% is no subtraction: like the original plain \TeX{}/\LaTeXe{} mechanism
% it holds the value of the \emph{last} stream allocated.
% \begin{macrocode}
\prop_new:N \g_@@_streams_prop
%<*package>
\int_step_inline:nnn
{ 0 }
{
\cs_if_exist:NTF \normalend
{ \tex_count:D 38 ~ }
{
\tex_count:D 16 ~ %
\cs_if_exist:NT \loccount { - 1 }
}
}
{
\prop_gput:Nnn \g_@@_streams_prop {#1} { Reserved~by~format }
}
%</package>
% \end{macrocode}
% \end{variable}
%
% \subsubsection{Stream management}
%
% \begin{macro}{\ior_new:N, \ior_new:c}
% Reserving a new stream is done by defining the name as equal to using the
% terminal.
% \begin{macrocode}
\cs_new_protected:Npn \ior_new:N #1 { \cs_new_eq:NN #1 \c_@@_term_ior }
\cs_generate_variant:Nn \ior_new:N { c }
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\g_tmpa_ior, \g_tmpb_ior}
% The usual scratch space.
% \begin{macrocode}
\ior_new:N \g_tmpa_ior
\ior_new:N \g_tmpb_ior
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\ior_open:Nn, \ior_open:cn}
% Use the conditional version, with an error if the file is not found.
% \begin{macrocode}
\cs_new_protected:Npn \ior_open:Nn #1#2
{ \ior_open:NnF #1 {#2} { \__kernel_file_missing:n {#2} } }
\cs_generate_variant:Nn \ior_open:Nn { c }
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\l_@@_file_name_tl}
% Data storage.
% \begin{macrocode}
\tl_new:N \l_@@_file_name_tl
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[TF]{\ior_open:Nn, \ior_open:cn}
% An auxiliary searches for the file in the \TeX{}, \LaTeXe{} and
% \LaTeX3 paths. Then pass the file found to the lower-level function
% which deals with streams. The |full_name| is empty when the file is
% not found.
% \begin{macrocode}
\prg_new_protected_conditional:Npnn \ior_open:Nn #1#2 { T , F , TF }
{
\file_get_full_name:nNTF {#2} \l_@@_file_name_tl
{
\__kernel_ior_open:No #1 \l_@@_file_name_tl
\prg_return_true:
}
{ \prg_return_false: }
}
\prg_generate_conditional_variant:Nnn \ior_open:Nn { c } { T , F , TF }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_new:N}
% In package mode, streams are reserved using \tn{newread} before they
% can be managed by \pkg{ior}. To prevent \pkg{ior} from being
% affected by redefinitions of \tn{newread} (such as done by the
% third-party package \pkg{morewrites}), this macro is saved here
% under a private name. The complicated code ensures that
% \cs{@@_new:N} is not \tn{outer} despite plain \TeX{}'s \tn{newread}
% being \tn{outer}. For \ConTeXt{}, we have to deal with the fact
% that \tn{newread} works like our own: it actually checks before
% altering definition.
% \begin{macrocode}
%<*package>
\exp_args:NNf \cs_new_protected:Npn \@@_new:N
{ \exp_args:NNc \exp_after:wN \exp_stop_f: { newread } }
\cs_if_exist:NT \normalend
{
\cs_new_eq:NN \@@_new_aux:N \@@_new:N
\cs_set_protected:Npn \@@_new:N #1
{
\cs_undefine:N #1
\@@_new_aux:N #1
}
}
%</package>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\__kernel_ior_open:Nn, \__kernel_ior_open:No}
% \begin{macro}{\@@_open_stream:Nn}
% The stream allocation itself uses the fact that there is a list of all of
% those available, so allocation is simply a question of using the number at
% the top of the list. In package mode, life gets more complex as it's
% important to keep things in sync. That is done using a two-part approach:
% any streams that have already been taken up by \pkg{ior} but are now free
% are tracked, so we first try those. If that fails, ask plain \TeX{} or \LaTeXe{}
% for a new stream and use that number (after a bit of conversion).
% \begin{macrocode}
\cs_new_protected:Npn \__kernel_ior_open:Nn #1#2
{
\ior_close:N #1
\seq_gpop:NNTF \g_@@_streams_seq \l_@@_stream_tl
{ \@@_open_stream:Nn #1 {#2} }
%<*initex>
{ \__kernel_msg_fatal:nn { kernel } { input-streams-exhausted } }
%</initex>
%<*package>
{
\@@_new:N #1
\tl_set:Nx \l_@@_stream_tl { \int_eval:n {#1} }
\@@_open_stream:Nn #1 {#2}
}
%</package>
}
\cs_generate_variant:Nn \__kernel_ior_open:Nn { No }
% \end{macrocode}
% Here, we act defensively in case \LuaTeX{} is in use with an
% extensionless file name.
% \begin{macrocode}
\cs_new_protected:Npx \@@_open_stream:Nn #1#2
{
\tex_global:D \tex_chardef:D #1 = \exp_not:N \l_@@_stream_tl \scan_stop:
\prop_gput:NVn \exp_not:N \g_@@_streams_prop #1 {#2}
\tex_openin:D #1
\sys_if_engine_luatex:TF
{ {#2} }
{ #2 \scan_stop: }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_close:N, \ior_close:c}
% Closing a stream means getting rid of it at the \TeX{} level and
% removing from the various data structures. Unless the name passed
% is an invalid stream number (outside the range $[0,15]$), it can be
% closed. On the other hand, it only gets added to the stack if it
% was not already there, to avoid duplicates building up.
% \begin{macrocode}
\cs_new_protected:Npn \ior_close:N #1
{
\int_compare:nT { -1 < #1 < \c_@@_term_ior }
{
\tex_closein:D #1
\prop_gremove:NV \g_@@_streams_prop #1
\seq_if_in:NVF \g_@@_streams_seq #1
{ \seq_gpush:NV \g_@@_streams_seq #1 }
\cs_gset_eq:NN #1 \c_@@_term_ior
}
}
\cs_generate_variant:Nn \ior_close:N { c }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_show_list:, \ior_log_list:}
% \begin{macro}{\@@_list:N}
% Show the property lists, but with some \enquote{pretty printing}.
% See the \pkg{l3msg} module. The first argument of the message is
% |ior| (as opposed to |iow|) and the second is empty if no read
% stream is open and non-empty (the list of streams formatted using
% \cs{msg_show_item_unbraced:nn}) otherwise. The code of the message
% \texttt{show-streams} takes care of translating |ior|/|iow| to
% English.
% \begin{macrocode}
\cs_new_protected:Npn \ior_show_list: { \@@_list:N \msg_show:nnxxxx }
\cs_new_protected:Npn \ior_log_list: { \@@_list:N \msg_log:nnxxxx }
\cs_new_protected:Npn \@@_list:N #1
{
#1 { LaTeX / kernel } { show-streams }
{ ior }
{
\prop_map_function:NN \g_@@_streams_prop
\msg_show_item_unbraced:nn
}
{ } { }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Reading input}
%
% \begin{macro}{\if_eof:w}
% The primitive conditional
% \begin{macrocode}
\cs_new_eq:NN \if_eof:w \tex_ifeof:D
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[pTF]{\ior_if_eof:N}
% To test if some particular input stream is exhausted the following
% conditional is provided. The primitive test can only deal with
% numbers in the range $[0,15]$ so we catch outliers (they are
% exhausted).
% \begin{macrocode}
\prg_new_conditional:Npnn \ior_if_eof:N #1 { p , T , F , TF }
{
\cs_if_exist:NTF #1
{
\int_compare:nTF { -1 < #1 < \c_@@_term_ior }
{
\if_eof:w #1
\prg_return_true:
\else:
\prg_return_false:
\fi:
}
{ \prg_return_true: }
}
{ \prg_return_true: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_get:NN, \@@_get:NN}
% \begin{macro}[TF]{\ior_get:NN}
% And here we read from files.
% \begin{macrocode}
\cs_new_protected:Npn \ior_get:NN #1#2
{ \ior_get:NNF #1 #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_new_protected:Npn \@@_get:NN #1#2
{ \tex_read:D #1 to #2 }
\prg_new_protected_conditional:Npnn \ior_get:NN #1#2 { T , F , TF }
{
\ior_if_eof:NTF #1
{ \prg_return_false: }
{
\@@_get:NN #1 #2
\prg_return_true:
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_str_get:NN, \@@_str_get:NN}
% \begin{macro}[TF]{\ior_str_get:NN}
% Reading as strings is a more complicated wrapper, as we wish to
% remove the endline character and restore it afterwards.
% \begin{macrocode}
\cs_new_protected:Npn \ior_str_get:NN #1#2
{ \ior_str_get:NNF #1 #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_new_protected:Npn \@@_str_get:NN #1#2
{
\exp_args:Nno \use:n
{
\int_set:Nn \tex_endlinechar:D { -1 }
\tex_readline:D #1 to #2
\int_set:Nn \tex_endlinechar:D
} { \int_use:N \tex_endlinechar:D }
}
\prg_new_protected_conditional:Npnn \ior_str_get:NN #1#2 { T , F , TF }
{
\ior_if_eof:NTF #1
{ \prg_return_false: }
{
\@@_str_get:NN #1 #2
\prg_return_true:
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\c_@@_term_noprompt_ior}
% For reading without a prompt.
% \begin{macrocode}
\int_const:Nn \c_@@_term_noprompt_ior { -1 }
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\ior_get_term:nN, \ior_str_get_term:nN}
% \begin{macro}{\@@_get_term:NnN}
% Getting from the terminal is better with pretty-printing.
% \begin{macrocode}
\cs_new_protected:Npn \ior_get_term:nN #1#2
{ \@@_get_term:NnN \@@_get:NN {#1} #2 }
\cs_new_protected:Npn \ior_str_get_term:nN #1#2
{ \@@_get_term:NnN \@@_str_get:NN {#1} #2 }
\cs_new_protected:Npn \@@_get_term:NnN #1#2#3
{
\group_begin:
\tex_escapechar:D = -1 \scan_stop:
\tl_if_blank:nTF {#2}
{ \exp_args:NNc #1 \c_@@_term_noprompt_ior }
{ \exp_args:NNc #1 \c_@@_term_ior }
{#2}
\exp_args:NNNv \group_end:
\tl_set:Nn #3 {#2}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[EXP]{\ior_map_break:, \ior_map_break:n}
% Usual map breaking functions.
% \begin{macrocode}
\cs_new:Npn \ior_map_break:
{ \prg_map_break:Nn \ior_map_break: { } }
\cs_new:Npn \ior_map_break:n
{ \prg_map_break:Nn \ior_map_break: }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_map_inline:Nn, \ior_str_map_inline:Nn}
% \begin{macro}{\@@_map_inline:NNn}
% \begin{macro}{\@@_map_inline:NNNn}
% \begin{macro}{\@@_map_inline_loop:NNN}
% Mapping to an input stream can be done on either a token or a string
% basis, hence the set up. Within that, there is a check to avoid reading
% past the end of a file, hence the two applications of \cs{ior_if_eof:N}
% and its lower-level analogue \cs{if_eof:w}.
% This mapping cannot be nested with twice the same stream, as the
% stream has only one \enquote{current line}.
% \begin{macrocode}
\cs_new_protected:Npn \ior_map_inline:Nn
{ \@@_map_inline:NNn \@@_get:NN }
\cs_new_protected:Npn \ior_str_map_inline:Nn
{ \@@_map_inline:NNn \@@_str_get:NN }
\cs_new_protected:Npn \@@_map_inline:NNn
{
\int_gincr:N \g__kernel_prg_map_int
\exp_args:Nc \@@_map_inline:NNNn
{ @@_map_ \int_use:N \g__kernel_prg_map_int :n }
}
\cs_new_protected:Npn \@@_map_inline:NNNn #1#2#3#4
{
\cs_gset_protected:Npn #1 ##1 {#4}
\ior_if_eof:NF #3 { \@@_map_inline_loop:NNN #1#2#3 }
\prg_break_point:Nn \ior_map_break:
{ \int_gdecr:N \g__kernel_prg_map_int }
}
\cs_new_protected:Npn \@@_map_inline_loop:NNN #1#2#3
{
#2 #3 \l_@@_internal_tl
\if_eof:w #3
\exp_after:wN \ior_map_break:
\fi:
\exp_args:No #1 \l_@@_internal_tl
\@@_map_inline_loop:NNN #1#2#3
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_map_variable:NNn, \ior_str_map_variable:NNn}
% \begin{macro}{\@@_map_variable:NNNn}
% \begin{macro}{\@@_map_variable_loop:NNNn}
% Since the \TeX{} primitive (\tn{read} or \tn{readline}) assigns the
% tokens read in the same way as a token list assignment, we simply
% call the appropriate primitive. The end-of-loop is checked using
% the primitive conditional for speed.
% \begin{macrocode}
\cs_new_protected:Npn \ior_map_variable:NNn
{ \@@_map_variable:NNNn \ior_get:NN }
\cs_new_protected:Npn \ior_str_map_variable:NNn
{ \@@_map_variable:NNNn \ior_str_get:NN }
\cs_new_protected:Npn \@@_map_variable:NNNn #1#2#3#4
{
\ior_if_eof:NF #2 { \@@_map_variable_loop:NNNn #1#2#3 {#4} }
\prg_break_point:Nn \ior_map_break: { }
}
\cs_new_protected:Npn \@@_map_variable_loop:NNNn #1#2#3#4
{
#1 #2 #3
\if_eof:w #2
\exp_after:wN \ior_map_break:
\fi:
#4
\@@_map_variable_loop:NNNn #1#2#3 {#4}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Output operations}
%
% \begin{macrocode}
%<@@=iow>
% \end{macrocode}
%
% There is a lot of similarity here to the input operations, at least for
% many of the basics. Thus quite a bit is copied from the earlier material
% with minor alterations.
%
% \subsubsection{Variables and constants}
%
% \begin{variable}{\c_log_iow, \c_term_iow}
% Here we allocate two output streams for writing to the transcript
% file only (\cs{c_log_iow}) and to both the terminal and transcript
% file (\cs{c_term_iow}). Recent \LuaTeX{} provide $128$ write
% streams; we also use \cs{c_term_iow} as the first non-allowed write
% stream so its value depends on the engine.
% \begin{macrocode}
\int_const:Nn \c_log_iow { -1 }
\int_const:Nn \c_term_iow
{
\bool_lazy_and:nnTF
{ \sys_if_engine_luatex_p: }
{ \int_compare_p:nNn \tex_luatexversion:D > { 80 } }
{ 128 }
{ 16 }
}
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_seq}
% A list of the currently-available output streams to be used as a
% stack. The stream $18$ is special, as \tn{write}18 is used to
% denote commands to be sent to the OS\@.
% \begin{macrocode}
\seq_new:N \g_@@_streams_seq
%<*initex>
\exp_args:Nnx \use:n
{ \seq_gset_split:Nnn \g_@@_streams_seq { } }
{
\int_step_function:nnN { 0 } { \c_term_iow }
\prg_do_nothing:
}
\int_compare:nNnF \c_term_iow < { 18 }
{ \seq_gremove_all:Nn \g_@@_streams_seq { 18 } }
%</initex>
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_stream_tl}
% Used to recover the raw stream number from the stack.
% \begin{macrocode}
\tl_new:N \l_@@_stream_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_prop}
% As for reads with the appropriate adjustment of the register numbers to
% check on.
% \begin{macrocode}
\prop_new:N \g_@@_streams_prop
%<*package>
\int_step_inline:nnn
{ 0 }
{
\cs_if_exist:NTF \normalend
{ \tex_count:D 39 ~ }
{
\tex_count:D 17 ~
\cs_if_exist:NT \loccount { - 1 }
}
}
{
\prop_gput:Nnn \g_@@_streams_prop {#1} { Reserved~by~format }
}
%</package>
% \end{macrocode}
% \end{variable}
%
% \subsection{Stream management}
%
% \begin{macro}{\iow_new:N, \iow_new:c}
% Reserving a new stream is done by defining the name as equal to writing
% to the terminal: odd but at least consistent.
% \begin{macrocode}
\cs_new_protected:Npn \iow_new:N #1 { \cs_new_eq:NN #1 \c_term_iow }
\cs_generate_variant:Nn \iow_new:N { c }
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\g_tmpa_iow, \g_tmpb_iow}
% The usual scratch space.
% \begin{macrocode}
\iow_new:N \g_tmpa_iow
\iow_new:N \g_tmpb_iow
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_new:N}
% As for read streams, copy \tn{newwrite} in package mode, making sure
% that it is not \tn{outer}.
% \begin{macrocode}
%<*package>
\exp_args:NNf \cs_new_protected:Npn \@@_new:N
{ \exp_args:NNc \exp_after:wN \exp_stop_f: { newwrite } }
%</package>
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\l_@@_file_name_tl}
% Data storage.
% \begin{macrocode}
\tl_new:N \l_@@_file_name_tl
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\iow_open:Nn, \iow_open:cn}
% \begin{macro}{\@@_open_stream:Nn, \@@_open_stream:NV}
% The same idea as for reading, but without the path and without the need
% to allow for a conditional version.
% \begin{macrocode}
\cs_new_protected:Npn \iow_open:Nn #1#2
{
\tl_set:Nx \l_@@_file_name_tl
{
\__kernel_file_name_quote:e
{ \__kernel_file_name_sanitize:n {#2} }
}
\iow_close:N #1
\seq_gpop:NNTF \g_@@_streams_seq \l_@@_stream_tl
{ \@@_open_stream:NV #1 \l_@@_file_name_tl }
%<*initex>
{ \__kernel_msg_fatal:nn { kernel } { output-streams-exhausted } }
%</initex>
%<*package>
{
\@@_new:N #1
\tl_set:Nx \l_@@_stream_tl { \int_eval:n {#1} }
\@@_open_stream:NV #1 \l_@@_file_name_tl
}
%</package>
}
\cs_generate_variant:Nn \iow_open:Nn { c }
\cs_new_protected:Npn \@@_open_stream:Nn #1#2
{
\tex_global:D \tex_chardef:D #1 = \l_@@_stream_tl \scan_stop:
\prop_gput:NVn \g_@@_streams_prop #1 {#2}
\tex_immediate:D \tex_openout:D #1 #2 \scan_stop:
}
\cs_generate_variant:Nn \@@_open_stream:Nn { NV }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_close:N, \iow_close:c}
% Closing a stream is not quite the reverse of opening one. First,
% the close operation is easier than the open one, and second as the
% stream is actually a number we can use it directly to show that the
% slot has been freed up.
% \begin{macrocode}
\cs_new_protected:Npn \iow_close:N #1
{
\int_compare:nT { - \c_log_iow < #1 < \c_term_iow }
{
\tex_immediate:D \tex_closeout:D #1
\prop_gremove:NV \g_@@_streams_prop #1
\seq_if_in:NVF \g_@@_streams_seq #1
{ \seq_gpush:NV \g_@@_streams_seq #1 }
\cs_gset_eq:NN #1 \c_term_iow
}
}
\cs_generate_variant:Nn \iow_close:N { c }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_show_list:, \iow_log_list:}
% \begin{macro}{\@@_list:N}
% Done as for input, but with a copy of the auxiliary so the name is correct.
% \begin{macrocode}
\cs_new_protected:Npn \iow_show_list: { \@@_list:N \msg_show:nnxxxx }
\cs_new_protected:Npn \iow_log_list: { \@@_list:N \msg_log:nnxxxx }
\cs_new_protected:Npn \@@_list:N #1
{
#1 { LaTeX / kernel } { show-streams }
{ iow }
{
\prop_map_function:NN \g_@@_streams_prop
\msg_show_item_unbraced:nn
}
{ } { }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Deferred writing}
%
% \begin{macro}{\iow_shipout_x:Nn, \iow_shipout_x:Nx, \iow_shipout_x:cn, \iow_shipout_x:cx}
% First the easy part, this is the primitive, which expects its
% argument to be braced.
% \begin{macrocode}
\cs_new_protected:Npn \iow_shipout_x:Nn #1#2
{ \tex_write:D #1 {#2} }
\cs_generate_variant:Nn \iow_shipout_x:Nn { c, Nx, cx }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_shipout:Nn, \iow_shipout:Nx, \iow_shipout:cn, \iow_shipout:cx}
% With \eTeX{} available deferred writing without expansion is easy.
% \begin{macrocode}
\cs_new_protected:Npn \iow_shipout:Nn #1#2
{ \tex_write:D #1 { \exp_not:n {#2} } }
\cs_generate_variant:Nn \iow_shipout:Nn { c, Nx, cx }
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Immediate writing}
%
% \begin{macro}{\__kernel_iow_with:Nnn}
% \begin{macro}{\@@_with:nNnn}
% If the integer~|#1| is equal to~|#2|, just leave~|#3| in the input
% stream. Otherwise, pass the old value to an auxiliary, which sets
% the integer to the new value, runs the code, and restores the
% integer.
% \begin{macrocode}
\cs_new_protected:Npn \__kernel_iow_with:Nnn #1#2
{
\int_compare:nNnTF {#1} = {#2}
{ \use:n }
{ \exp_args:No \@@_with:nNnn { \int_use:N #1 } #1 {#2} }
}
\cs_new_protected:Npn \@@_with:nNnn #1#2#3#4
{
\int_set:Nn #2 {#3}
#4
\int_set:Nn #2 {#1}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_now:Nn, \iow_now:Nx, \iow_now:cn, \iow_now:cx}
% This routine writes the second argument onto the output stream without
% expansion. If this stream isn't open, the output goes to the terminal
% instead. If the first argument is no output stream at all, we get an
% internal error. We don't use the expansion done by \tn{write} to
% get the |Nx| variant, because it differs in subtle ways from
% \texttt{x}-expansion, namely, macro parameter characters would not
% need to be doubled. We set the \tn{newlinechar} to~$10$ using
% \cs{__kernel_iow_with:Nnn} to support formats such as plain \TeX{}: otherwise,
% \cs{iow_newline:} would not work. We do not do this for
% \cs{iow_shipout:Nn} or \cs{iow_shipout_x:Nn}, as \TeX{} looks at the
% value of the \tn{newlinechar} at shipout time in those cases.
% \begin{macrocode}
\cs_new_protected:Npn \iow_now:Nn #1#2
{
\__kernel_iow_with:Nnn \tex_newlinechar:D { `\^^J }
{ \tex_immediate:D \tex_write:D #1 { \exp_not:n {#2} } }
}
\cs_generate_variant:Nn \iow_now:Nn { c, Nx, cx }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_log:n, \iow_log:x}
% \begin{macro}{\iow_term:n, \iow_term:x}
% Writing to the log and the terminal directly are relatively easy.
% \begin{macrocode}
\cs_set_protected:Npn \iow_log:x { \iow_now:Nx \c_log_iow }
\cs_new_protected:Npn \iow_log:n { \iow_now:Nn \c_log_iow }
\cs_set_protected:Npn \iow_term:x { \iow_now:Nx \c_term_iow }
\cs_new_protected:Npn \iow_term:n { \iow_now:Nn \c_term_iow }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Special characters for writing}
%
% \begin{macro}{\iow_newline:}
% Global variable holding the character that forces a new line when
% something is written to an output stream.
% \begin{macrocode}
\cs_new:Npn \iow_newline: { ^^J }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_char:N}
% Function to write any escaped char to an output stream.
% \begin{macrocode}
\cs_new_eq:NN \iow_char:N \cs_to_str:N
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Hard-wrapping lines to a character count}
%
% The code here implements a generic hard-wrapping function. This is
% used by the messaging system, but is designed such that it is
% available for other uses.
%
% \begin{variable}{\l_iow_line_count_int}
% This is the \enquote{raw} number of characters in a line which
% can be written to the terminal.
% The standard value is the line length typically used by
% \TeX{}Live and \hologo{MiKTeX}.
% \begin{macrocode}
\int_new:N \l_iow_line_count_int
\int_set:Nn \l_iow_line_count_int { 78 }
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_newline_tl}
% The token list inserted to produce a new line, with the
% \meta{run-on text}.
% \begin{macrocode}
\tl_new:N \l_@@_newline_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_line_target_int}
% This stores the target line count: the full number of characters
% in a line, minus any part for a leader at the start of each line.
% \begin{macrocode}
\int_new:N \l_@@_line_target_int
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_set_indent:n}
% \begin{macro}{\@@_unindent:w}
% \begin{variable}{\l_@@_one_indent_tl, \l_@@_one_indent_int}
% The \texttt{one_indent} variables hold one indentation marker and
% its length. The \cs{@@_unindent:w} auxiliary removes one
% indentation. The function \cs{@@_set_indent:n} (that could possibly
% be public) sets the indentation in a consistent way. We set it to
% four spaces by default.
% \begin{macrocode}
\tl_new:N \l_@@_one_indent_tl
\int_new:N \l_@@_one_indent_int
\cs_new:Npn \@@_unindent:w { }
\cs_new_protected:Npn \@@_set_indent:n #1
{
\tl_set:Nx \l_@@_one_indent_tl
{ \exp_args:No \__kernel_str_to_other_fast:n { \tl_to_str:n {#1} } }
\int_set:Nn \l_@@_one_indent_int
{ \str_count:N \l_@@_one_indent_tl }
\exp_last_unbraced:NNo
\cs_set:Npn \@@_unindent:w \l_@@_one_indent_tl { }
}
\exp_args:Nx \@@_set_indent:n { \prg_replicate:nn { 4 } { ~ } }
% \end{macrocode}
% \end{variable}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\l_@@_indent_tl, \l_@@_indent_int}
% The current indentation (some copies of \cs{l_@@_one_indent_tl}) and
% its number of characters.
% \begin{macrocode}
\tl_new:N \l_@@_indent_tl
\int_new:N \l_@@_indent_int
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_line_tl, \l_@@_line_part_tl}
% These hold the current line of text and a partial line to be added
% to it, respectively.
% \begin{macrocode}
\tl_new:N \l_@@_line_tl
\tl_new:N \l_@@_line_part_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_line_break_bool}
% Indicates whether the line was broken precisely at a chunk boundary.
% \begin{macrocode}
\bool_new:N \l_@@_line_break_bool
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_wrap_tl}
% Used for the expansion step before detokenizing, and for the output
% from wrapping text: fully expanded and with lines which are not
% overly long.
% \begin{macrocode}
\tl_new:N \l_@@_wrap_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\c_@@_wrap_marker_tl}
% \begin{variable}
% {
% \c_@@_wrap_end_marker_tl,
% \c_@@_wrap_newline_marker_tl,
% \c_@@_wrap_allow_break_marker_tl,
% \c_@@_wrap_indent_marker_tl,
% \c_@@_wrap_unindent_marker_tl
% }
% Every special action of the wrapping code is starts with
% the same recognizable string, \cs{c_@@_wrap_marker_tl}.
% Upon seeing that \enquote{word}, the wrapping code reads
% one space-delimited argument to know what operation to
% perform. The setting of \tn{escapechar} here is not
% very important, but makes \cs{c_@@_wrap_marker_tl} look
% marginally nicer.
% \begin{macrocode}
\group_begin:
\int_set:Nn \tex_escapechar:D { -1 }
\tl_const:Nx \c_@@_wrap_marker_tl
{ \tl_to_str:n { \^^I \^^O \^^W \^^_ \^^W \^^R \^^A \^^P } }
\group_end:
\tl_map_inline:nn
{ { end } { newline } { allow_break } { indent } { unindent } }
{
\tl_const:cx { c_@@_wrap_ #1 _marker_tl }
{
\c_@@_wrap_marker_tl
#1
\c_catcode_other_space_tl
}
}
% \end{macrocode}
% \end{variable}
% \end{variable}
%
% \begin{macro}{\iow_allow_break:}
% \begin{macro}[EXP]{\@@_allow_break:}
% \begin{macro}[EXP]{\@@_allow_break_error:}
% We set \cs{iow_allow_break:n} to produce an error when outside
% messages. Within wrapped message, it is set to \cs{@@_allow_break:}
% when valid and otherwise to \cs{@@_allow_break_error:}. The second
% produces an error expandably.
% \begin{macrocode}
\cs_new_protected:Npn \iow_allow_break:
{
\__kernel_msg_error:nnnn { kernel } { iow-indent }
{ \iow_wrap:nnnN } { \iow_allow_break: }
}
\cs_new:Npx \@@_allow_break: { \c_@@_wrap_allow_break_marker_tl }
\cs_new:Npn \@@_allow_break_error:
{
\__kernel_msg_expandable_error:nnnn { kernel } { iow-indent }
{ \iow_wrap:nnnN } { \iow_allow_break: }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_indent:n}
% \begin{macro}[EXP]{\@@_indent:n}
% \begin{macro}[EXP]{\@@_indent_error:n}
% We set \cs{iow_indent:n} to produce an error when outside
% messages. Within wrapped message, it is set to \cs{@@_indent:n} when
% valid and otherwise to \cs{@@_indent_error:n}. The first places the
% instruction for increasing the indentation before its argument, and
% the instruction for unindenting afterwards. The second produces an
% error expandably. Note that there are no forced line-break, so
% the indentation only changes when the next line is started.
% \begin{macrocode}
\cs_new_protected:Npn \iow_indent:n #1
{
\__kernel_msg_error:nnnnn { kernel } { iow-indent }
{ \iow_wrap:nnnN } { \iow_indent:n } {#1}
#1
}
\cs_new:Npx \@@_indent:n #1
{
\c_@@_wrap_indent_marker_tl
#1
\c_@@_wrap_unindent_marker_tl
}
\cs_new:Npn \@@_indent_error:n #1
{
\__kernel_msg_expandable_error:nnnnn { kernel } { iow-indent }
{ \iow_wrap:nnnN } { \iow_indent:n } {#1}
#1
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_wrap:nnnN, \iow_wrap:nxnN}
% The main wrapping function works as follows. First give |\\|,
% \verb*|\ | and other formatting commands the correct definition for
% messages and perform the given setup~|#3|. The definition of
% \verb*|\ | uses an \enquote{other} space rather than a normal space,
% because the latter might be absorbed by \TeX{} to end a number or
% other \texttt{f}-type expansions.
% Use \cs{conditionally@traceoff} if defined; it is introduced by the
% \pkg{trace} package and suppresses uninteresting tracing of the
% wrapping code.
% \begin{macrocode}
\cs_new_protected:Npn \iow_wrap:nnnN #1#2#3#4
{
\group_begin:
%<package> \cs_if_exist_use:N \conditionally@traceoff
\int_set:Nn \tex_escapechar:D { -1 }
\cs_set:Npx \{ { \token_to_str:N \{ }
\cs_set:Npx \# { \token_to_str:N \# }
\cs_set:Npx \} { \token_to_str:N \} }
\cs_set:Npx \% { \token_to_str:N \% }
\cs_set:Npx \~ { \token_to_str:N \~ }
\int_set:Nn \tex_escapechar:D { 92 }
\cs_set_eq:NN \\ \iow_newline:
\cs_set_eq:NN \ \c_catcode_other_space_tl
\cs_set_eq:NN \iow_allow_break: \@@_allow_break:
\cs_set_eq:NN \iow_indent:n \@@_indent:n
#3
% \end{macrocode}
% Then fully-expand the input: in package mode, the expansion uses
% \LaTeXe{}'s \tn{protect} mechanism in the same way as \tn{typeout}.
% In generic mode this setting is useless but harmless. As soon as
% the expansion is done, reset \cs{iow_indent:n} to its error
% definition: it only works in the first argument of
% \cs{iow_wrap:nnnN}.
% \begin{macrocode}
%<package> \cs_set_eq:NN \protect \token_to_str:N
\tl_set:Nx \l_@@_wrap_tl {#1}
\cs_set_eq:NN \iow_allow_break: \@@_allow_break_error:
\cs_set_eq:NN \iow_indent:n \@@_indent_error:n
% \end{macrocode}
% Afterwards, set the newline marker (two assignments to fully expand,
% then convert to a string) and initialize the target count for lines
% (the first line has target count \cs{l_iow_line_count_int} instead).
% \begin{macrocode}
\tl_set:Nx \l_@@_newline_tl { \iow_newline: #2 }
\tl_set:Nx \l_@@_newline_tl { \tl_to_str:N \l_@@_newline_tl }
\int_set:Nn \l_@@_line_target_int
{ \l_iow_line_count_int - \str_count:N \l_@@_newline_tl + 1 }
% \end{macrocode}
% Sanity check.
% \begin{macrocode}
\int_compare:nNnT { \l_@@_line_target_int } < 0
{
\tl_set:Nn \l_@@_newline_tl { \iow_newline: }
\int_set:Nn \l_@@_line_target_int
{ \l_iow_line_count_int + 1 }
}
% \end{macrocode}
% There is then a loop over the input, which stores the wrapped
% result in \cs{l_@@_wrap_tl}. After the loop, the resulting text is
% passed on to the function which has been given as a post-processor.
% The \cs{tl_to_str:N} step converts the \enquote{other} spaces back
% to normal spaces. The \texttt{f}-expansion removes a leading space
% from \cs{l_@@_wrap_tl}.
% \begin{macrocode}
\@@_wrap_do:
\exp_args:NNf \group_end:
#4 { \tl_to_str:N \l_@@_wrap_tl }
}
\cs_generate_variant:Nn \iow_wrap:nnnN { nx }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_do:, \@@_wrap_fix_newline:w, \@@_wrap_start:w}
% Escape spaces and change newlines to \cs{c_@@_wrap_newline_marker_tl}.
% Set up a few variables, in particular the initial
% value of \cs{l_@@_wrap_tl}: the space stops the
% \texttt{f}-expansion of the main wrapping function and
% \cs{use_none:n} removes a newline marker inserted by later code.
% The main loop consists of repeatedly calling the \texttt{chunk}
% auxiliary to wrap chunks delimited by (newline or indentation)
% markers.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_do:
{
\tl_set:Nx \l_@@_wrap_tl
{
\exp_args:No \__kernel_str_to_other_fast:n \l_@@_wrap_tl
\c_@@_wrap_end_marker_tl
}
\tl_set:Nx \l_@@_wrap_tl
{
\exp_after:wN \@@_wrap_fix_newline:w \l_@@_wrap_tl
^^J \q_nil ^^J \q_stop
}
\exp_after:wN \@@_wrap_start:w \l_@@_wrap_tl
}
\cs_new:Npn \@@_wrap_fix_newline:w #1 ^^J #2 ^^J
{
#1
\if_meaning:w \q_nil #2
\use_i_delimit_by_q_stop:nw
\fi:
\c_@@_wrap_newline_marker_tl
\@@_wrap_fix_newline:w #2 ^^J
}
\cs_new_protected:Npn \@@_wrap_start:w
{
\bool_set_false:N \l_@@_line_break_bool
\tl_clear:N \l_@@_line_tl
\tl_clear:N \l_@@_line_part_tl
\tl_set:Nn \l_@@_wrap_tl { ~ \use_none:n }
\int_zero:N \l_@@_indent_int
\tl_clear:N \l_@@_indent_tl
\@@_wrap_chunk:nw { \l_iow_line_count_int }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_chunk:nw, \@@_wrap_next:nw}
% The \texttt{chunk} and \texttt{next} auxiliaries are defined
% indirectly to obtain the expansions of \cs{c_catcode_other_space_tl}
% and \cs{c_@@_wrap_marker_tl} in their definition. The \texttt{next}
% auxiliary calls a function corresponding to the type of marker (its
% |##2|), which can be \texttt{newline} or \texttt{indent} or
% \texttt{unindent} or \texttt{end}. The first argument of the
% \texttt{chunk} auxiliary is a target number of characters and the
% second is some string to wrap. If the chunk is empty simply call
% \texttt{next}. Otherwise, set up a call to \cs{@@_wrap_line:nw},
% including the indentation if the current line is empty, and
% including a trailing space (|#1|) before the
% \cs{@@_wrap_end_chunk:w} auxiliary.
% \begin{macrocode}
\cs_set_protected:Npn \@@_tmp:w #1#2
{
\cs_new_protected:Npn \@@_wrap_chunk:nw ##1##2 #2
{
\tl_if_empty:nTF {##2}
{
\tl_clear:N \l_@@_line_part_tl
\@@_wrap_next:nw {##1}
}
{
\tl_if_empty:NTF \l_@@_line_tl
{
\@@_wrap_line:nw
{ \l_@@_indent_tl }
##1 - \l_@@_indent_int ;
}
{ \@@_wrap_line:nw { } ##1 ; }
##2 #1
\@@_wrap_end_chunk:w 7 6 5 4 3 2 1 0 \q_stop
}
}
\cs_new_protected:Npn \@@_wrap_next:nw ##1##2 #1
{ \use:c { @@_wrap_##2:n } {##1} }
}
\exp_args:NVV \@@_tmp:w \c_catcode_other_space_tl \c_@@_wrap_marker_tl
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_line:nw}
% \begin{macro}[EXP]
% {
% \@@_wrap_line_loop:w,
% \@@_wrap_line_aux:Nw,
% \@@_wrap_line_seven:nnnnnnn,
% \@@_wrap_line_end:NnnnnnnnN,
% \@@_wrap_line_end:nw,
% \@@_wrap_end_chunk:w
% }
% This is followed by \Arg{string} \meta{intexpr} |;|. It stores the
% \meta{string} and up to \meta{intexpr} characters from the current
% chunk into \cs{l_@@_line_part_tl}. Characters are grabbed 8~at a
% time and left in \cs{l_@@_line_part_tl} by the \texttt{line_loop}
% auxiliary. When $k<8$ remain to be found, the \texttt{line_aux}
% auxiliary calls the \texttt{line_end} auxiliary followed by (the
% single digit) $k$, then $7-k$ empty brace groups, then the chunk's
% remaining characters. The \texttt{line_end} auxiliary leaves
% $k$~characters from the chunk in the line part, then ends the
% assignment. Ignore the \cs{use_none:nnnnn} line for now. If the
% next character is a space the line can be broken there:
% store what we found into the result and get the next line.
% Otherwise some work is needed to find a break-point. So far we have
% ignored what happens if the chunk is shorter than the requested
% number of characters: this is dealt with by the \texttt{end_chunk}
% auxiliary, which gets treated like a character by the rest of the
% code. It ends up being called either as one of the arguments
% |#2|--|#9| of the \texttt{line_loop} auxiliary or as one of the
% arguments |#2|--|#8| of the \texttt{line_end} auxiliary. In both
% cases stop the assignment and work out how many characters are still
% needed. Notice that when we have exactly seven arguments to clean up,
% a \cs{exp_stop_f:} has to be inserted to stop the \cs{exp:w}.
% The weird \cs{use_none:nnnnn} ensures that the required
% data is in the right place.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_line:nw #1
{
\tex_edef:D \l_@@_line_part_tl { \if_false: } \fi:
#1
\exp_after:wN \@@_wrap_line_loop:w
\int_value:w \int_eval:w
}
\cs_new:Npn \@@_wrap_line_loop:w #1 ; #2#3#4#5#6#7#8#9
{
\if_int_compare:w #1 < 8 \exp_stop_f:
\@@_wrap_line_aux:Nw #1
\fi:
#2 #3 #4 #5 #6 #7 #8 #9
\exp_after:wN \@@_wrap_line_loop:w
\int_value:w \int_eval:w #1 - 8 ;
}
\cs_new:Npn \@@_wrap_line_aux:Nw #1#2#3 \exp_after:wN #4 ;
{
#2
\exp_after:wN \@@_wrap_line_end:NnnnnnnnN
\exp_after:wN #1
\exp:w \exp_end_continue_f:w
\exp_after:wN \exp_after:wN
\if_case:w #1 \exp_stop_f:
\prg_do_nothing:
\or: \use_none:n
\or: \use_none:nn
\or: \use_none:nnn
\or: \use_none:nnnn
\or: \use_none:nnnnn
\or: \use_none:nnnnnn
\or: \@@_wrap_line_seven:nnnnnnn
\fi:
{ } { } { } { } { } { } { } #3
}
\cs_new:Npn \@@_wrap_line_seven:nnnnnnn #1#2#3#4#5#6#7 { \exp_stop_f: }
\cs_new:Npn \@@_wrap_line_end:NnnnnnnnN #1#2#3#4#5#6#7#8#9
{
#2 #3 #4 #5 #6 #7 #8
\use_none:nnnnn \int_eval:w 8 - ; #9
\token_if_eq_charcode:NNTF \c_space_token #9
{ \@@_wrap_line_end:nw { } }
{ \if_false: { \fi: } \@@_wrap_break:w #9 }
}
\cs_new:Npn \@@_wrap_line_end:nw #1
{
\if_false: { \fi: }
\@@_wrap_store_do:n {#1}
\@@_wrap_next_line:w
}
\cs_new:Npn \@@_wrap_end_chunk:w
#1 \int_eval:w #2 - #3 ; #4#5 \q_stop
{
\if_false: { \fi: }
\exp_args:Nf \@@_wrap_next:nw { \int_eval:n { #2 - #4 } }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_wrap_break:w}
% \begin{macro}[EXP]
% {
% \@@_wrap_break_first:w,
% \@@_wrap_break_none:w,
% \@@_wrap_break_loop:w,
% \@@_wrap_break_end:w,
% }
% Functions here are defined indirectly: \cs{@@_tmp:w} is eventually
% called with an \enquote{other} space as its argument. The goal is
% to remove from \cs{l_@@_line_part_tl} the part after the last space.
% In most cases this is done by repeatedly calling the
% \texttt{break_loop} auxiliary, which leaves \enquote{words}
% (delimited by spaces) until it hits the trailing space: then its
% argument |##3| is |?| \cs{@@_wrap_break_end:w} instead of a single
% token, and that \texttt{break_end} auxiliary leaves in the
% assignment the line until the last space, then calls
% \cs{@@_wrap_line_end:nw} to finish up the line and move on to the
% next. If there is no space in \cs{l_@@_line_part_tl} then the
% \texttt{break_first} auxiliary calls the \texttt{break_none}
% auxiliary. In that case, if the current line is empty, the complete
% word (including |##4|, characters beyond what we had grabbed) is
% added to the line, making it over-long. Otherwise, the word is
% used for the following line (and the last space of the line so far
% is removed because it was inserted due to the presence of a marker).
% \begin{macrocode}
\cs_set_protected:Npn \@@_tmp:w #1
{
\cs_new:Npn \@@_wrap_break:w
{
\tex_edef:D \l_@@_line_part_tl
{ \if_false: } \fi:
\exp_after:wN \@@_wrap_break_first:w
\l_@@_line_part_tl
#1
{ ? \@@_wrap_break_end:w }
\q_mark
}
\cs_new:Npn \@@_wrap_break_first:w ##1 #1 ##2
{
\use_none:nn ##2 \@@_wrap_break_none:w
\@@_wrap_break_loop:w ##1 #1 ##2
}
\cs_new:Npn \@@_wrap_break_none:w ##1##2 #1 ##3 \q_mark ##4 #1
{
\tl_if_empty:NTF \l_@@_line_tl
{ ##2 ##4 \@@_wrap_line_end:nw { } }
{ \@@_wrap_line_end:nw { \@@_wrap_trim:N } ##2 ##4 #1 }
}
\cs_new:Npn \@@_wrap_break_loop:w ##1 #1 ##2 #1 ##3
{
\use_none:n ##3
##1 #1
\@@_wrap_break_loop:w ##2 #1 ##3
}
\cs_new:Npn \@@_wrap_break_end:w ##1 #1 ##2 ##3 #1 ##4 \q_mark
{ ##1 \@@_wrap_line_end:nw { } ##3 }
}
\exp_args:NV \@@_tmp:w \c_catcode_other_space_tl
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_wrap_next_line:w}
% The special case where the end of a line coincides with the end of a
% chunk is detected here, to avoid a spurious empty line. Otherwise,
% call \cs{@@_wrap_line:nw} to find characters for the next line
% (remembering to account for the indentation).
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_next_line:w #1#2 \q_stop
{
\tl_clear:N \l_@@_line_tl
\token_if_eq_meaning:NNTF #1 \@@_wrap_end_chunk:w
{
\tl_clear:N \l_@@_line_part_tl
\bool_set_true:N \l_@@_line_break_bool
\@@_wrap_next:nw { \l_@@_line_target_int }
}
{
\@@_wrap_line:nw
{ \l_@@_indent_tl }
\l_@@_line_target_int - \l_@@_indent_int ;
#1 #2 \q_stop
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_allow_break:n}
% This is called after a chunk has been wrapped. The
% \cs{l_@@_line_part_tl} typically ends with a space (except at the
% beginning of a line?), which we remove since the
% \texttt{allow\_break} marker should not insert a space. Then move
% on with the next chunk, making sure to adjust the target number of
% characters for the line in case we did remove a space.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_allow_break:n #1
{
\tl_set:Nx \l_@@_line_tl
{ \l_@@_line_tl \@@_wrap_trim:N \l_@@_line_part_tl }
\bool_set_false:N \l_@@_line_break_bool
\tl_if_empty:NTF \l_@@_line_part_tl
{ \@@_wrap_chunk:nw {#1} }
{ \exp_args:Nf \@@_wrap_chunk:nw { \int_eval:n { #1 + 1 } } }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_indent:n, \@@_wrap_unindent:n}
% These functions are called after a chunk has been wrapped, when
% encountering \texttt{indent}/\texttt{unindent} markers. Add the
% line part (last line part of the previous chunk) to the line so far
% and reset a boolean denoting the presence of a line-break. Most
% importantly, add or remove one indent from the current indent (both
% the integer and the token list). Finally, continue wrapping.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_indent:n #1
{
\tl_put_right:Nx \l_@@_line_tl { \l_@@_line_part_tl }
\bool_set_false:N \l_@@_line_break_bool
\int_add:Nn \l_@@_indent_int { \l_@@_one_indent_int }
\tl_put_right:No \l_@@_indent_tl { \l_@@_one_indent_tl }
\@@_wrap_chunk:nw {#1}
}
\cs_new_protected:Npn \@@_wrap_unindent:n #1
{
\tl_put_right:Nx \l_@@_line_tl { \l_@@_line_part_tl }
\bool_set_false:N \l_@@_line_break_bool
\int_sub:Nn \l_@@_indent_int { \l_@@_one_indent_int }
\tl_set:Nx \l_@@_indent_tl
{ \exp_after:wN \@@_unindent:w \l_@@_indent_tl }
\@@_wrap_chunk:nw {#1}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_newline:n, \@@_wrap_end:n}
% These functions are called after a chunk has been line-wrapped, when
% encountering a \texttt{newline}/\texttt{end} marker. Unless we just
% took a line-break, store the line part and the line so far into the
% whole \cs{l_@@_wrap_tl}, trimming a trailing space. In the
% \texttt{newline} case look for a new line (of length
% \cs{l_@@_line_target_int}) in a new chunk.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_newline:n #1
{
\bool_if:NF \l_@@_line_break_bool
{ \@@_wrap_store_do:n { \@@_wrap_trim:N } }
\bool_set_false:N \l_@@_line_break_bool
\@@_wrap_chunk:nw { \l_@@_line_target_int }
}
\cs_new_protected:Npn \@@_wrap_end:n #1
{
\bool_if:NF \l_@@_line_break_bool
{ \@@_wrap_store_do:n { \@@_wrap_trim:N } }
\bool_set_false:N \l_@@_line_break_bool
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_store_do:n}
% First add the last line part to the line, then append it to
% \cs{l_@@_wrap_tl} with the appropriate new line (with
% \enquote{run-on} text), possibly with its last space removed (|#1|
% is empty or \cs{@@_wrap_trim:N}).
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_store_do:n #1
{
\tl_set:Nx \l_@@_line_tl
{ \l_@@_line_tl \l_@@_line_part_tl }
\tl_set:Nx \l_@@_wrap_tl
{
\l_@@_wrap_tl
\l_@@_newline_tl
#1 \l_@@_line_tl
}
\tl_clear:N \l_@@_line_tl
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_wrap_trim:N, \@@_wrap_trim:w, \@@_wrap_trim_aux:w}
% Remove one trailing \enquote{other} space from the argument if present.
% \begin{macrocode}
\cs_set_protected:Npn \@@_tmp:w #1
{
\cs_new:Npn \@@_wrap_trim:N ##1
{ \exp_after:wN \@@_wrap_trim:w ##1 \q_mark #1 \q_mark \q_stop }
\cs_new:Npn \@@_wrap_trim:w ##1 #1 \q_mark
{ \@@_wrap_trim_aux:w ##1 \q_mark }
\cs_new:Npn \@@_wrap_trim_aux:w ##1 \q_mark ##2 \q_stop {##1}
}
\exp_args:NV \@@_tmp:w \c_catcode_other_space_tl
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%<@@=file>
% \end{macrocode}
%
% \subsection{File operations}
%
% \begin{variable}{\l_@@_internal_tl}
% Used as a short-term scratch variable.
% \begin{macrocode}
\tl_new:N \l_@@_internal_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}
% {
% \g_file_curr_dir_str ,
% \g_file_curr_ext_str ,
% \g_file_curr_name_str
% }
% The name of the current file should be available at all times:
% the name itself is set dynamically.
% \begin{macrocode}
\str_new:N \g_file_curr_dir_str
\str_new:N \g_file_curr_ext_str
\str_new:N \g_file_curr_name_str
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_stack_seq}
% The input list of files is stored as a sequence stack. In package
% mode we can recover the information from the details held by
% \LaTeXe{} (we must be in the preamble and loaded using \tn{usepackage}
% or \tn{RequirePackage}). As \LaTeXe{} doesn't store directory and
% name separately, we stick to the same convention here. In pre-loading,
% \tn{@currnamestack} is empty so is skipped.
% \begin{macrocode}
\seq_new:N \g_@@_stack_seq
%<*package>
\group_begin:
\cs_set_protected:Npn \@@_tmp:w #1#2#3
{
\tl_if_blank:nTF {#1}
{
\cs_set:Npn \@@_tmp:w ##1 " ##2 " ##3 \q_stop
{ { } {##2} { } }
\seq_gput_right:Nx \g_@@_stack_seq
{
\exp_after:wN \@@_tmp:w \tex_jobname:D
" \tex_jobname:D " \q_stop
}
}
{
\seq_gput_right:Nn \g_@@_stack_seq { { } {#1} {#2} }
\@@_tmp:w
}
}
\cs_if_exist:NT \@currnamestack
{
\tl_if_empty:NF \@currnamestack
{ \exp_after:wN \@@_tmp:w \@currnamestack }
}
\group_end:
%</package>
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_record_seq}
% The total list of files used is recorded separately from the current
% file stack, as nothing is ever popped from this list. The current
% file name should be included in the file list! In format mode, this
% is done at the very start of the \TeX{} run. In package mode we
% will eventually copy the contents of \cs{@filelist}.
% \begin{macrocode}
\seq_new:N \g_@@_record_seq
%<*initex>
\tex_everyjob:D \exp_after:wN
{
\tex_the:D \tex_everyjob:D
\seq_gput_right:NV \g_@@_record_seq \g_file_curr_name_str
}
%</initex>
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_base_name_tl, \l_@@_full_name_tl}
% For storing the basename and full path whilst passing data internally.
% \begin{macrocode}
\tl_new:N \l_@@_base_name_tl
\tl_new:N \l_@@_full_name_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_dir_str, \l_@@_ext_str, \l_@@_name_str}
% Used in parsing a path into parts: in contrast to the above, these are
% never used outside of the current module.
% \begin{macrocode}
\str_new:N \l_@@_dir_str
\str_new:N \l_@@_ext_str
\str_new:N \l_@@_name_str
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_file_search_path_seq}
% The current search path.
% \begin{macrocode}
\seq_new:N \l_file_search_path_seq
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_tmp_seq}
% Scratch space for comma list conversion in package mode.
% \begin{macrocode}
%<*package>
\seq_new:N \l_@@_tmp_seq
%</package>
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[rEXP]{\__kernel_file_name_sanitize:n}
% \begin{macro}[rEXP]{\__kernel_file_name_expand_loop:w}
% \begin{macro}[rEXP]{\__kernel_file_name_expand_N_type:Nw}
% \begin{macro}[rEXP]{\__kernel_file_name_expand_group:nw}
% \begin{macro}[rEXP]{\__kernel_file_name_expand_space:w}
% \begin{macro}[rEXP]{\__kernel_file_name_trim_spaces:n}
% \begin{macro}[rEXP]{\__kernel_file_name_trim_spaces:nw}
% \begin{macro}[rEXP]{\__kernel_file_name_trim_spaces_aux:n}
% \begin{macro}[rEXP]{\__kernel_file_name_trim_spaces_aux:w}
% Expanding the file name without expanding active characters is done
% using the same token-by-token approach as for example case changing.
% The finale outcome only need be \texttt{e}-type expandable, so there
% is no need for the shuffling that is seen in other locations.
% \begin{macrocode}
\cs_new:Npn \__kernel_file_name_sanitize:n #1
{
\exp_args:Ne \__kernel_file_name_trim_spaces:n
{
\__kernel_file_name_expand_loop:w #1
\q_recursion_tail \q_recursion_stop
}
}
\cs_new:Npn \__kernel_file_name_expand_loop:w #1 \q_recursion_stop
{
\tl_if_head_is_N_type:nTF {#1}
{ \__kernel_file_name_expand_N_type:Nw }
{
\tl_if_head_is_group:nTF {#1}
{ \__kernel_file_name_expand_group:nw }
{ \__kernel_file_name_expand_space:w }
}
#1 \q_recursion_stop
}
\cs_new:Npn \__kernel_file_name_expand_N_type:Nw #1
{
\quark_if_recursion_tail_stop:N #1
\bool_lazy_and:nnTF
{ \token_if_expandable_p:N #1 }
{
\bool_not_p:n
{
\bool_lazy_any_p:n
{
{ \token_if_protected_macro_p:N #1 }
{ \token_if_protected_long_macro_p:N #1 }
{ \token_if_active_p:N #1 }
}
}
}
{ \exp_after:wN \__kernel_file_name_expand_loop:w #1 }
{
\token_to_str:N #1
\__kernel_file_name_expand_loop:w
}
}
\cs_new:Npx \__kernel_file_name_expand_group:nw #1
{
\c_left_brace_str
\exp_not:N \__kernel_file_name_expand_loop:w
#1
\c_right_brace_str
}
\exp_last_unbraced:NNo
\cs_new:Npx \__kernel_file_name_expand_space:w \c_space_tl
{
\c_space_tl
\exp_not:N \__kernel_file_name_expand_loop:w
}
% \end{macrocode}
% Spaces need to be trimmed from the start of the name and from the end of
% any extension. However, the name we are passed might not have an extension:
% that means we have to look for one. If there is no extension, we still use
% the standard trimming function but deliberately prevent any spaces being
% removed at the end.
% \begin{macrocode}
\cs_new:Npn \__kernel_file_name_trim_spaces:n #1
{ \__kernel_file_name_trim_spaces:nw {#1} #1 . \q_nil . \q_stop }
\cs_new:Npn \__kernel_file_name_trim_spaces:nw #1#2 . #3 . #4 \q_stop
{
\quark_if_nil:nTF {#3}
{
\exp_args:Ne \__kernel_file_name_trim_spaces_aux:n
{ \tl_trim_spaces:n { #1 \s_stop } }
}
{ \tl_trim_spaces:n {#1} }
}
\cs_new:Npn \__kernel_file_name_trim_spaces_aux:n #1
{ \__kernel_file_name_trim_spaces_aux:w #1 }
\cs_new:Npn \__kernel_file_name_trim_spaces_aux:w #1 \s_stop {#1}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[rEXP]{\__kernel_file_name_quote:n, \__kernel_file_name_quote:e}
% \begin{macro}[rEXP]{\__kernel_file_name_quote_auxi:nnnw}
% \begin{macro}[rEXP]{\__kernel_file_name_quote_auxii:nnn}
% \begin{macro}[rEXP]{\__kernel_file_name_quote_auxiii:nw}
% Quoting file name uses basically the same approach as for
% \texttt{luaquotejobname}: count the |"| tokens, remove them then
% re-add at the extremities.
% \begin{macrocode}
\cs_new:Npn \__kernel_file_name_quote:n #1
{
\__kernel_file_name_quote_auxi:nnnw {#1} { 0 } { }
#1 " \q_recursion_tail " \q_recursion_stop
}
\cs_generate_variant:Nn \__kernel_file_name_quote:n { e }
\cs_new:Npn \__kernel_file_name_quote_auxi:nnnw #1#2#3#4 "
{
\quark_if_recursion_tail_stop_do:nn {#4}
{ \__kernel_file_name_quote_auxii:nnn {#1} {#2} {#3} }
\__kernel_file_name_quote_auxi:nnnw {#1} { #2 + 1 } { #3#4 }
}
\cs_new:Npn \__kernel_file_name_quote_auxii:nnn #1#2#3
{
\int_if_even:nT {#2}
{
\__kernel_msg_expandable_error:nnn
{ kernel } { unbalanced-quote-in-filename } {#1}
}
\__kernel_file_name_quote_auxiii:nw {#3} #3 ~ \q_nil \q_stop
}
\cs_new:Npn \__kernel_file_name_quote_auxiii:nw #1 #2 ~ #3 \q_stop
{
\quark_if_nil:nTF {#3}
{ #1 }
{ "#1" }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\c_@@_marker_tl}
% The same idea as the marker for rescanning token lists: this pair of
% tokens cannot appear in a file that is being input.
% \begin{macrocode}
\tl_const:Nx \c_@@_marker_tl { : \token_to_str:N : }
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[TF]{\file_get:nnN}
% \begin{macro}{\file_get:nnN,\@@_get_aux:nnN,\@@_get_do:Nw}
% The approach here is similar to that for \cs{tl_set_rescan:Nnn}.
% The file contents are grabbed as an argument delimited by
% \cs{c_@@_marker_tl}. A few subtleties: braces in \cs{if_false:}
% \ldots{} \cs{fi:} to deal with possible alignment tabs,
% \tn{tracingnesting} to avoid a warning about a group being closed
% inside the \tn{scantokens}, and \cs{prg_return_true:} is placed
% after the end-of-file marker.
% \begin{macrocode}
\cs_new_protected:Npn \file_get:nnN #1#2#3
{
\file_get:nnNF {#1} {#2} #3
{ \tl_set:Nn #3 { \q_no_value } }
}
\prg_new_protected_conditional:Npnn \file_get:nnN #1#2#3 { T , F , TF }
{
\file_get_full_name:nNTF {#1} \l_@@_full_name_tl
{
\exp_args:NV \@@_get_aux:nnN
\l_@@_full_name_tl
{#2} #3
\prg_return_true:
}
{ \prg_return_false: }
}
\cs_new_protected:Npn \@@_get_aux:nnN #1#2#3
{
\if_false: { \fi:
\group_begin:
\int_set_eq:NN \tex_tracingnesting:D \c_zero_int
\exp_args:No \tex_everyeof:D { \c_@@_marker_tl }
#2 \scan_stop:
\exp_after:wN \@@_get_do:Nw
\exp_after:wN #3
\exp_after:wN \prg_do_nothing:
\tex_input:D #1 \scan_stop:
\if_false: } \fi:
}
\exp_args:Nno \use:nn
{ \cs_new_protected:Npn \@@_get_do:Nw #1#2 }
{ \c_@@_marker_tl }
{
\group_end:
\tl_set:No #1 {#2}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_file_size:n}
% A copy of the primitive where it's available, or the \LuaTeX{}
% equivalent if relevant.
% \begin{macrocode}
\cs_new_eq:NN \@@_file_size:n \tex_filesize:D
\sys_if_engine_luatex:T
{
\cs_gset:Npn \@@_file_size:n #1
{
\lua_now:e
{
l3kernel.filesize
( " \lua_escape:e {#1} " )
}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[rEXP]{\file_full_name:n, \@@_full_name:n}
% \begin{macro}[rEXP]{\@@_full_name:nn}
% \begin{macro}[rEXP]{\@@_full_name_aux:nn}
% \begin{macro}[rEXP]{\@@_full_name_aux:n}
% \begin{macro}[rEXP]{\@@_file_name_cleanup:w}
% \begin{macro}[rEXP]{\@@_file_name_end:}
% \begin{macro}[rEXP]{\@@_file_name_ext_check:n}
% \begin{macro}[rEXP]
% {
% \@@_file_name_ext_check_auxi:nw ,
% \@@_file_name_ext_check_auxii:nw ,
% \@@_file_name_ext_check_auxiii:nw
% }
% File searching can be carried out if the \tn{pdffilesize} primitive
% or an equivalent is available. That of course means we need to
% arrange for everything else to here to be done by expansion too.
% We start off by sanitizing the name and quoting if required: we
% may need to remove those quotes, so the raw name is passed too.
% \begin{macrocode}
\cs_new:Npn \file_full_name:n #1
{
\exp_args:Ne \@@_full_name:n
{ \__kernel_file_name_sanitize:n {#1} }
}
\cs_new:Npn \@@_full_name:n #1
{
\exp_args:Ne \@@_full_name:nn
{ \__kernel_file_name_quote:n {#1} } {#1}
}
% \end{macrocode}
% First, we check of the file is just here: no mapping so we do not
% need the break part of the broader auxiliary. We are using the fact
% that the primitive here returns nothing if the file is entirely absent.
% For package mode, \tn{input@path} is a token list not a sequence.
% \begin{macrocode}
\cs_new:Npn \@@_full_name:nn #1#2
{
\tl_if_blank:nF {#1}
{
\tl_if_blank:eTF { \@@_file_size:n {#1} }
{
\seq_map_tokens:Nn \l_file_search_path_seq
{ \@@_full_name_aux:nn {#2} }
%<*package>
\cs_if_exist:NT \input@path
{
\tl_map_tokens:Nn \input@path
{ \@@_full_name_aux:nn {#2} }
}
%</package>
\@@_file_name_end:
}
{ \@@_file_ext_check:n {#1} }
}
}
% \end{macrocode}
% Two pars to the auxiliary here so we can avoid doing quoting
% twice in the event we find the right file.
% \begin{macrocode}
\cs_new:Npn \@@_full_name_aux:nn #1#2
{
\exp_args:Ne \@@_full_name_aux:n
{ \__kernel_file_name_quote:e { \tl_to_str:n {#2} / #1 } }
}
\cs_new:Npn \@@_full_name_aux:n #1
{
\tl_if_blank:eF { \@@_file_size:n {#1} }
{
\seq_map_break:n
{
\@@_file_ext_check:n {#1}
\@@_file_name_cleanup:w
}
}
}
\cs_new:Npn \@@_file_name_cleanup:w #1 \@@_file_name_end: { }
\cs_new:Npn \@@_file_name_end: { }
% \end{macrocode}
% As \TeX{} automatically adds |.tex| if there is no extension,
% there is a little clean up to do here. First, find the file
% extension if present, ignoring any quotes and avoiding dots in
% the path.(The quoted name is retained for the common case that
% there is no additional work to do.)
% \begin{macrocode}
\cs_new:Npn \@@_file_ext_check:n #1
{ \@@_file_ext_check_auxi:nw {#1} #1 " #1 " \q_stop }
\cs_new:Npn \@@_file_ext_check_auxi:nw #1#2 " #3 " #4 \q_stop
{ \@@_file_ext_check_auxii:nw {#1} #3 / \q_nil / \q_stop }
\cs_new:Npn \@@_file_ext_check_auxii:nw #1#2 / #3 / #4 \q_stop
{
\quark_if_nil:nTF {#3}
{ \@@_file_ext_check_auxiii:nw {#1} #2 . \q_nil . \q_stop }
{ \@@_file_ext_check_auxii:nw {#1} #3 / #4 \q_stop }
}
\cs_new:Npx \@@_file_ext_check_auxiii:nw #1#2 . #3 . #4 \q_stop
{
\exp_not:N \quark_if_nil:nTF {#3}
{
\exp_not:N \exp_args:Nee \exp_not:N \@@_file_ext_check_auxiv:nn
{ \exp_not:N \__kernel_file_name_quote:n {#1} }
{
\exp_not:N \__kernel_file_name_quote:n
{ #1 \tl_to_str:n { .tex } }
}
}
{#1}
}
\cs_new:Npn \@@_file_ext_check_auxiv:nn #1#2
{
\tl_if_blank:eTF { \@@_file_size:n {#2} }
{#1}
{
\int_compare:nNnTF
{ \@@_file_size:n {#1} } = { \@@_file_size:n {#2} }
{#2}
{#1}
}
}
% \end{macrocode}
% Deal with the fact that the primitive might not be available.
% \begin{macrocode}
\bool_lazy_or:nnF
{ \cs_if_exist_p:N \tex_filesize:D }
{ \sys_if_engine_luatex_p: }
{
\cs_gset:Npn \file_full_name:n #1
{
\__kernel_msg_expandable_error:nnn
{ kernel } { primitive-not-available }
{ \(pdf)filesize }
}
}
\__kernel_msg_new:nnnn { kernel } { primitive-not-available }
{ Primitive~\token_to_str:N #1 not~available }
{
The~version~of~your~TeX~engine~does~not~provide~functionality~equivalent~to~
the~#1~primitive.
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_get_full_name:nN, \file_get_full_name:VN}
% \begin{macro}[TF]{\file_get_full_name:nN, \file_get_full_name:VN}
% \begin{macro}{\@@_get_full_name_search:nN}
% These functions pre-date using \cs{tex_filesize:D} for file searching,
% so are |get| functions with protection. To avoid having different
% search set ups, they are simply wrappers around the code above.
% \begin{macrocode}
\cs_new_protected:Npn \file_get_full_name:nN #1#2
{
\file_get_full_name:nNF {#1} #2
{ \tl_set:Nn #2 { \q_no_value } }
}
\cs_generate_variant:Nn \file_get_full_name:nN { V }
\prg_new_protected_conditional:Npnn \file_get_full_name:nN #1#2 { T , F , TF }
{
\tl_set:Nx #2
{ \file_full_name:n {#1} }
\tl_if_empty:NTF #2
{ \prg_return_false: }
{ \prg_return_true: }
}
\cs_generate_variant:Nn \file_get_full_name:nNT { V }
\cs_generate_variant:Nn \file_get_full_name:nNF { V }
\cs_generate_variant:Nn \file_get_full_name:nNTF { V }
% \end{macrocode}
% If \cs{tex_filesize:D} is not available, the
% way to test if a file exists is to try to open it: if it does
% not exist then \TeX{} reports end-of-file. A search is made
% looking at each potential path in turn (starting from the current
% directory). The first location is of course treated as the correct
% one: this is done by jumping to \cs{prg_break_point:}. If nothing
% is found, |#2| is returned empty. A special case when there is no
% extension is that once the first location is found we test the
% existence of the file with |.tex| extension in that directory, and
% if it exists we include the |.tex| extension in the result.
% \begin{macrocode}
\bool_lazy_or:nnF
{ \cs_if_exist_p:N \tex_filesize:D }
{ \sys_if_engine_luatex_p: }
{
\prg_set_protected_conditional:Npnn \file_get_full_name:nN #1#2 { T , F , TF }
{
\@@_get_full_name_search:nN { } \use:n
\seq_map_inline:Nn \l_file_search_path_seq
{ \@@_get_full_name_search:nN { ##1 / } \seq_map_break:n }
%<*package>
\cs_if_exist:NT \input@path
{
\tl_map_inline:Nn \input@path
{ \@@_get_full_name_search:nN { ##1 } \tl_map_break:n }
}
%</package>
\tl_set:Nn \l_@@_full_name_tl { \q_no_value }
\prg_break_point:
\quark_if_no_value:NTF \l_@@_full_name_tl
{
\ior_close:N \g_@@_internal_ior
\prg_return_false:
}
{
\file_parse_full_name:VNNN \l_@@_full_name_tl
\l_@@_dir_str \l_@@_name_str \l_@@_ext_str
\str_if_empty:NT \l_@@_ext_str
{
\__kernel_ior_open:No \g_@@_internal_ior
{ \l_@@_full_name_tl .tex }
\ior_if_eof:NF \g_@@_internal_ior
{ \tl_put_right:Nn \l_@@_full_name_tl { .tex } }
}
\ior_close:N \g_@@_internal_ior
\tl_set_eq:NN #2 \l_@@_full_name_tl
\prg_return_true:
}
}
}
\cs_new_protected:Npn \@@_get_full_name_search:nN #1#2
{
\tl_set:Nx \l_@@_full_name_tl
{
\__kernel_file_name_quote:e
{ \tl_to_str:n {#1} \l_@@_base_name_tl }
}
\__kernel_ior_open:No \g_@@_internal_ior \l_@@_full_name_tl
\ior_if_eof:NF \g_@@_internal_ior { #2 { \prg_break: } }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \begin{variable}{\g_@@_internal_ior}
% A reserved stream to test for file existence, if required.
% \begin{macrocode}
\bool_lazy_or:nnF
{ \cs_if_exist_p:N \tex_filesize:D }
{ \sys_if_engine_luatex_p: }
{ \ior_new:N \g_@@_internal_ior }
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[rEXP]{\file_mdfive_hash:n, \file_size:n, \file_timestamp:n}
% \begin{macro}[rEXP]{\@@_details:nn, \@@_details_aux:nn}
% \begin{macro}[rEXP]{\@@_mdfive_hash:n}
% Getting file details by expansion is relatively easy if a bit repetitive.
% As the MD5 function has a slightly different syntax from the other commands,
% there is a little cleaning up to do.
% \begin{macrocode}
\cs_new:Npn \file_mdfive_hash:n #1
{ \@@_details:nn {#1} { mdfivesum } }
\cs_new:Npn \file_size:n #1
{ \@@_details:nn {#1} { size } }
\cs_new:Npn \file_timestamp:n #1
{ \@@_details:nn {#1} { moddate } }
\cs_new:Npn \@@_details:nn #1#2
{
\exp_args:Ne \@@_details_aux:nn
{ \file_full_name:n {#1} } {#2}
}
\cs_new:Npn \@@_details_aux:nn #1#2
{
\tl_if_blank:nF {#1}
{ \use:c { tex_file #2 :D } {#1} }
}
\sys_if_engine_luatex:TF
{
\cs_gset:Npn \@@_details_aux:nn #1#2
{
\lua_now:e
{ l3kernel.file#2 ( " \lua_escape:e { #1 } " ) }
}
}
{
\cs_gset:Npn \file_mdfive_hash:n #1
{ \exp_args:Ne \@@_mdfive_hash:n { \file_full_name:n {#1} } }
\cs_new:Npn \@@_mdfive_hash:n #1
{ \tex_mdfivesum:D file {#1} }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[noTF]
% {\file_get_mdfive_hash:nN, \file_get_size:nN, \file_get_timestamp:nN}
% \begin{macro}{\@@_get_details:nnN}
% Non-expandable wrappers around the above in the case where appropriate
% primitive support exists.
% \begin{macrocode}
\cs_new_protected:Npn \file_get_mdfive_hash:nN #1#2
{ \file_get_mdfive_hash:nNF {#1} #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_new_protected:Npn \file_get_size:nN #1#2
{ \file_get_size:nNF {#1} #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_new_protected:Npn \file_get_timestamp:nN #1#2
{ \file_get_timestamp:nNF {#1} #2 { \tl_set:Nn #2 { \q_no_value } } }
\prg_new_protected_conditional:Npnn \file_get_mdfive_hash:nN #1#2 { T , F , TF }
{ \@@_get_details:nnN {#1} { mdfive_hash } #2 }
\prg_new_protected_conditional:Npnn \file_get_size:nN #1#2 { T , F , TF }
{ \@@_get_details:nnN {#1} { size } #2 }
\prg_new_protected_conditional:Npnn \file_get_timestamp:nN #1#2 { T , F , TF }
{ \@@_get_details:nnN {#1} { timestamp } #2 }
\cs_new_protected:Npn \@@_get_details:nnN #1#2#3
{
\tl_set:Nx #3
{ \use:c { file_ #2 :n } {#1} }
\tl_if_empty:NTF #3
{ \prg_return_false: }
{ \prg_return_true: }
}
% \end{macrocode}
% Where the primitive is not available, issue an error: this is a little
% more conservative than absolutely needed, but does work.
% \begin{macrocode}
\bool_lazy_or:nnF
{ \cs_if_exist_p:N \tex_filesize:D }
{ \sys_if_engine_luatex_p: }
{
\cs_set_protected:Npn \@@_get_details:nnN #1#2#3
{
\tl_clear:N #3
\__kernel_msg_error:nnx
{ kernel } { primitive-not-available }
{
\token_to_str:N \(pdf)file
\str_case:nn {#2}
{
{ mdfive_hash } { mdfivesum }
{ timestamp } { moddate }
{ size } { size }
}
}
\prg_return_false:
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_str_cmp:nn}
% \begin{macro}[EXP]{\@@_str_escape:n}
% As we are doing a fixed-length \enquote{big} integer comparison, it
% is easiest to use the low-level behavior of string comparisons.
% \begin{macrocode}
\cs_new:Npn \@@_str_cmp:nn #1#2 { \tex_strcmp:D {#1} {#2} }
\sys_if_engine_luatex:T
{
\cs_set:Npn \@@_str_cmp:nn #1#2
{
\lua_now:e
{
l3kernel.strcmp
(
" \@@_str_escape:n {#1}",
" \@@_str_escape:n {#2}"
)
}
}
\cs_new:Npn \@@_str_escape:n #1
{
\lua_escape:e
{ \__kernel_tl_to_str:w \use:e { {#1} } }
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[EXP, pTF]{\file_compare_timestamp:nNn}
% \begin{macro}[EXP]{\@@_compare_timestamp:nnN}
% \begin{macro}[EXP]{\@@_timestamp:n}
% Comparison of file date can be done by using the low-level nature of the
% string comparison functions.
% \begin{macrocode}
\prg_new_conditional:Npnn \file_compare_timestamp:nNn #1#2#3
{ p , T , F , TF }
{
\exp_args:Nee \@@_compare_timestamp:nnN
{ \file_full_name:n {#1} }
{ \file_full_name:n {#3} }
#2
}
\cs_new:Npn \@@_compare_timestamp:nnN #1#2#3
{
\tl_if_blank:nTF {#1}
{
\if_charcode:w #3 <
\prg_return_true:
\else:
\prg_return_false:
\fi:
}
{
\tl_if_blank:nTF {#2}
{
\if_charcode:w #3 >
\prg_return_true:
\else:
\prg_return_false:
\fi:
}
{
\if_int_compare:w
\@@_str_cmp:nn
{ \@@_timestamp:n {#1} }
{ \@@_timestamp:n {#2} }
#3 0 \exp_stop_f:
\prg_return_true:
\else:
\prg_return_false:
\fi:
}
}
}
\sys_if_engine_luatex:TF
{
\cs_new:Npn \@@_timestamp:n #1
{
\lua_now:e
{ l3kernel.filemoddate ( " \lua_escape:e {#1} " ) }
}
}
{ \cs_new_eq:NN \@@_timestamp:n \tex_filemoddate:D }
\cs_if_exist:NF \tex_filemoddate:D
{
\prg_set_conditional:Npnn \file_compare_timestamp:nNn #1#2#3
{ p , T , F , TF }
{
\__kernel_msg_expandable_error:nnn
{ kernel } { primitive-not-available }
{ \(pdf)filemoddate }
\prg_return_false:
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[TF]{\file_if_exist:n}
% The test for the existence of a file is a wrapper around the function to
% add a path to a file. If the file was found, the path contains
% something, whereas if the file was not located then the return value
% is empty.
% \begin{macrocode}
\prg_new_protected_conditional:Npnn \file_if_exist:n #1 { T , F , TF }
{
\file_get_full_name:nNTF {#1} \l_@@_full_name_tl
{ \prg_return_true: }
{ \prg_return_false: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_if_exist_input:n, \file_if_exist_input:nF}
% Input of a file with a test for existence. We do not define the |T|
% or |TF| variants because the most useful place to place the
% \meta{true code} would be inconsistent with other conditionals.
% \begin{macrocode}
\cs_new_protected:Npn \file_if_exist_input:n #1
{
\file_get_full_name:nNT {#1} \l_@@_full_name_tl
{ \@@_input:V \l_@@_full_name_tl }
}
\cs_new_protected:Npn \file_if_exist_input:nF #1#2
{
\file_get_full_name:nNTF {#1} \l_@@_full_name_tl
{ \@@_input:V \l_@@_full_name_tl }
{#2}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_input_stop:}
% A simple rename.
% \begin{macrocode}
\cs_new_protected:Npn \file_input_stop: { \tex_endinput:D }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\__kernel_file_missing:n}
% An error message for a missing file, also used in \cs{ior_open:Nn}.
% \begin{macrocode}
\cs_new_protected:Npn \__kernel_file_missing:n #1
{
\__kernel_msg_error:nnx { kernel } { file-not-found }
{ \__kernel_file_name_sanitize:n {#1} }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_input:n}
% \begin{macro}{\@@_input:n, \@@_input:V}
% \begin{macro}{\@@_input_push:n, \__kernel_file_input_push:n}
% \begin{macro}{\@@_input_pop:, \__kernel_file_input_pop:}
% \begin{macro}{\@@_input_pop:nnn}
% Loading a file is done in a safe way, checking first that the file
% exists and loading only if it does. Push the file name on the
% \cs{g_@@_stack_seq}, and add it to the file list, either
% \cs{g_@@_record_seq}, or \cs{@filelist} in package mode.
% \begin{macrocode}
\cs_new_protected:Npn \file_input:n #1
{
\file_get_full_name:nNTF {#1} \l_@@_full_name_tl
{ \@@_input:V \l_@@_full_name_tl }
{ \__kernel_file_missing:n {#1} }
}
\cs_new_protected:Npn \@@_input:n #1
{
%<*initex>
\seq_gput_right:Nn \g_@@_record_seq {#1}
%</initex>
%<*package>
\clist_if_exist:NTF \@filelist
{ \@addtofilelist {#1} }
{ \seq_gput_right:Nn \g_@@_record_seq {#1} }
%</package>
\@@_input_push:n {#1}
\tex_input:D #1 \c_space_tl
\@@_input_pop:
}
\cs_generate_variant:Nn \@@_input:n { V }
% \end{macrocode}
% Keeping a track of the file data is easy enough: we store the separated
% parts so we do not need to parse them twice.
% \begin{macrocode}
\cs_new_protected:Npn \@@_input_push:n #1
{
\seq_gpush:Nx \g_@@_stack_seq
{
{ \g_file_curr_dir_str }
{ \g_file_curr_name_str }
{ \g_file_curr_ext_str }
}
\file_parse_full_name:nNNN {#1}
\l_@@_dir_str \l_@@_name_str \l_@@_ext_str
\str_gset_eq:NN \g_file_curr_dir_str \l_@@_dir_str
\str_gset_eq:NN \g_file_curr_name_str \l_@@_name_str
\str_gset_eq:NN \g_file_curr_ext_str \l_@@_ext_str
}
%<*package>
\cs_new_eq:NN \__kernel_file_input_push:n \@@_input_push:n
%</package>
\cs_new_protected:Npn \@@_input_pop:
{
\seq_gpop:NN \g_@@_stack_seq \l_@@_internal_tl
\exp_after:wN \@@_input_pop:nnn \l_@@_internal_tl
}
%<*package>
\cs_new_eq:NN \__kernel_file_input_pop: \@@_input_pop:
%</package>
\cs_new_protected:Npn \@@_input_pop:nnn #1#2#3
{
\str_gset:Nn \g_file_curr_dir_str {#1}
\str_gset:Nn \g_file_curr_name_str {#2}
\str_gset:Nn \g_file_curr_ext_str {#3}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_parse_full_name:nNNN, \file_parse_full_name:VNNN}
% \begin{macro}
% {\@@_parse_full_name_auxi:w, \@@_parse_full_name_split:nNNNTF}
% Parsing starts by stripping off any surrounding quotes. Then find
% the directory |#4| by splitting at the last~|/|. (The auxiliary
% returns \texttt{true}/\texttt{false} depending on whether it found
% the delimiter.) We correct for the case of a file in the root |/|,
% as in that case we wish to keep the trailing (and only) slash. Then
% split the base name |#5| at the last dot. If there was indeed a
% dot, |#5| contains the name and |#6| the extension without the dot,
% which we add back for convenience. In the special case of no
% extension given, the auxiliary stored the name into |#6|, we just
% have to move it to |#5|.
% \begin{macrocode}
\cs_new_protected:Npn \file_parse_full_name:nNNN #1#2#3#4
{
\exp_after:wN \@@_parse_full_name_auxi:w
\tl_to_str:n { #1 " #1 " } \q_stop #2#3#4
}
\cs_generate_variant:Nn \file_parse_full_name:nNNN { V }
\cs_new_protected:Npn \@@_parse_full_name_auxi:w
#1 " #2 " #3 \q_stop #4#5#6
{
\@@_parse_full_name_split:nNNNTF {#2} / #4 #5
{ \str_if_empty:NT #4 { \str_set:Nn #4 { / } } }
{ }
\exp_args:No \@@_parse_full_name_split:nNNNTF {#5} . #5 #6
{ \str_put_left:Nn #6 { . } }
{
\str_set_eq:NN #5 #6
\str_clear:N #6
}
}
\cs_new_protected:Npn \@@_parse_full_name_split:nNNNTF #1#2#3#4
{
\cs_set_protected:Npn \@@_tmp:w ##1 ##2 #2 ##3 \q_stop
{
\tl_if_empty:nTF {##3}
{
\str_set:Nn #4 {##2}
\tl_if_empty:nTF {##1}
{
\str_clear:N #3
\use_ii:nn
}
{
\str_set:Nx #3 { \str_tail:n {##1} }
\use_i:nn
}
}
{ \@@_tmp:w { ##1 #2 ##2 } ##3 \q_stop }
}
\@@_tmp:w { } #1 #2 \q_stop
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_show_list:, \file_log_list:, \@@_list:N}
% \begin{macro}[EXP]{\@@_list_aux:n}
% A function to list all files used to the log, without duplicates.
% In package mode, if \cs{@filelist} is still defined, we need to take
% this list of file names into account (we capture it
% \cs{AtBeginDocument} into \cs{g_@@_record_seq}), turning it to a
% string (this does not affect the commas of this comma list).
% \begin{macrocode}
\cs_new_protected:Npn \file_show_list: { \@@_list:N \msg_show:nnxxxx }
\cs_new_protected:Npn \file_log_list: { \@@_list:N \msg_log:nnxxxx }
\cs_new_protected:Npn \@@_list:N #1
{
\seq_clear:N \l_@@_tmp_seq
%<*package>
\clist_if_exist:NT \@filelist
{
\exp_args:NNx \seq_set_from_clist:Nn \l_@@_tmp_seq
{ \tl_to_str:N \@filelist }
}
%</package>
\seq_concat:NNN \l_@@_tmp_seq \l_@@_tmp_seq \g_@@_record_seq
\seq_remove_duplicates:N \l_@@_tmp_seq
#1 { LaTeX/kernel } { file-list }
{ \seq_map_function:NN \l_@@_tmp_seq \@@_list_aux:n }
{ } { } { }
}
\cs_new:Npn \@@_list_aux:n #1 { \iow_newline: #1 }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% When used as a package, there is a need to hold onto the standard file
% list as well as the new one here. File names recorded in
% \cs{@filelist} must be turned to strings before being added to
% \cs{g_@@_record_seq}.
% \begin{macrocode}
%<*package>
\cs_if_exist:NT \@filelist
{
\AtBeginDocument
{
\exp_args:NNx \seq_set_from_clist:Nn \l_@@_tmp_seq
{ \tl_to_str:N \@filelist }
\seq_gconcat:NNN
\g_@@_record_seq
\g_@@_record_seq
\l_@@_tmp_seq
}
}
%</package>
% \end{macrocode}
%
% \subsection{GetIfInfo}
%
% \begin{macro}{\GetIdInfo}
% \begin{macro}{\@@_id_info_auxi:w, \@@_id_info_auxii:w, \@@_id_info_auxiii:w}
% As documented in \pkg{expl3.dtx} this function extracts file name
% etc from an \textsc{svn} \texttt{Id} line. This used to be how we
% got version number and so on in all modules, so it had to be defined
% in \pkg{l3bootstrap}. Now it's more convenient to define it after
% we have set up quite a lot of tools, and \pkg{l3file} seems the
% least unreasonable place for it.
%
% The idea here is to extract out the information needed from a standard
% \textsc{svn} \texttt{Id} line, but to avoid a line that would get
% changed when the file is checked in. Hence the fact that none of the
% lines here include both a dollar sign and the \texttt{Id} keyword!
% \begin{macrocode}
\cs_new_protected:Npn \GetIdInfo
{
\tl_clear_new:N \ExplFileDescription
\tl_clear_new:N \ExplFileDate
\tl_clear_new:N \ExplFileName
\tl_clear_new:N \ExplFileExtension
\tl_clear_new:N \ExplFileVersion
\group_begin:
\char_set_catcode_space:n { 32 }
\exp_after:wN
\group_end:
\@@_id_info_auxi:w
}
% \end{macrocode}
% A first check for a completely empty \textsc{svn} field. If that is
% not the case, there is a second case when a file created using
% \texttt{svn cp} but has not been checked in. That leaves a special
% marker \texttt{-1} version, which has no further data. Dealing
% correctly with that is the reason for the space in the line to use
% \cs{@@_id_info_auxii:w}.
% \begin{macrocode}
\cs_new_protected:Npn \@@_id_info_auxi:w $ #1 $ #2
{
\tl_set:Nn \ExplFileDescription {#2}
\str_if_eq:nnTF {#1} { Id }
{
\tl_set:Nn \ExplFileDate { 0000/00/00 }
\tl_set:Nn \ExplFileName { [unknown] }
\tl_set:Nn \ExplFileExtension { [unknown~extension] }
\tl_set:Nn \ExplFileVersion {-1}
}
{ \@@_id_info_auxii:w #1 ~ \q_stop }
}
% \end{macrocode}
% Here, |#1| is |Id|, |#2| is the file name, |#3| is the extension,
% |#4| is the version, |#5| is the check in date and |#6| is the check
% in time and user, plus some trailing spaces. If |#4| is the marker
% |-1| value then |#5| and |#6| are empty.
% \begin{macrocode}
\cs_new_protected:Npn \@@_id_info_auxii:w
#1 ~ #2.#3 ~ #4 ~ #5 ~ #6 \q_stop
{
\tl_set:Nn \ExplFileName {#2}
\tl_set:Nn \ExplFileExtension {#3}
\tl_set:Nn \ExplFileVersion {#4}
\str_if_eq:nnTF {#4} {-1}
{ \tl_set:Nn \ExplFileDate { 0000/00/00 } }
{ \@@_id_info_auxiii:w #5 - 0 - 0 - \q_stop }
}
% \end{macrocode}
% Convert an \textsc{svn}-style date into a \LaTeX{}-style one.
% \begin{macrocode}
\cs_new_protected:Npn \@@_id_info_auxiii:w #1 - #2 - #3 - #4 \q_stop
{ \tl_set:Nn \ExplFileDate { #1/#2/#3 } }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Messages}
%
% \begin{macrocode}
\__kernel_msg_new:nnnn { kernel } { file-not-found }
{ File~'#1'~not~found. }
{
The~requested~file~could~not~be~found~in~the~current~directory,~
in~the~TeX~search~path~or~in~the~LaTeX~search~path.
}
\__kernel_msg_new:nnn { kernel } { file-list }
{
>~File~List~<
#1 \\
.............
}
\__kernel_msg_new:nnnn { kernel } { input-streams-exhausted }
{ Input~streams~exhausted }
{
TeX~can~only~open~up~to~16~input~streams~at~one~time.\\
All~16~are~currently~in~use,~and~something~wanted~to~open~
another~one.
}
\__kernel_msg_new:nnnn { kernel } { output-streams-exhausted }
{ Output~streams~exhausted }
{
TeX~can~only~open~up~to~16~output~streams~at~one~time.\\
All~16~are~currently~in~use,~and~something~wanted~to~open~
another~one.
}
\__kernel_msg_new:nnnn { kernel } { unbalanced-quote-in-filename }
{ Unbalanced~quotes~in~file~name~'#1'. }
{
File~names~must~contain~balanced~numbers~of~quotes~(").
}
\__kernel_msg_new:nnnn { kernel } { iow-indent }
{ Only~#1 (arg~1)~allows~#2 }
{
The~command~#2 can~only~be~used~in~messages~
which~will~be~wrapped~using~#1.
\tl_if_empty:nF {#3} { ~ It~was~called~with~argument~'#3'. }
}
% \end{macrocode}
%
% \subsection{Functions delayed from earlier modules}
%
%<@@=sys>
%
% \begin{variable}{\c_sys_platform_str}
% Detecting the platform on \LuaTeX{} is easy: for other engines, we use
% the fact that the two common cases have special null files. It is possible
% to probe further (see package \pkg{platform}), but that requires shell
% escape and seems unlikely to be useful. This is set up here as it requires
% file searching.
% \begin{macrocode}
\sys_if_engine_luatex:TF
{
\str_const:Nx \c_sys_platform_str
{ \tex_directlua:D { tex.print(os.type) } }
}
{
\file_if_exist:nTF { nul: }
{
\file_if_exist:nF { /dev/null }
{ \str_const:Nn \c_sys_platform_str { windows } }
}
{
\file_if_exist:nT { /dev/null }
{ \str_const:Nn \c_sys_platform_str { unix } }
}
}
\cs_if_exist:NF \c_sys_platform_str
{ \str_const:Nn \c_sys_platform_str { unknown } }
% \end{macrocode}
% \end{variable}
% \begin{macro}[pTF]{\sys_if_platform_unix:}
% \begin{macro}[pTF]{\sys_if_platform_windows:}
% We can now set up the tests.
% \begin{macrocode}
\clist_map_inline:nn { unix , windows }
{
\@@_const:nn { sys_if_platform_ #1 }
{ \str_if_eq_p:Vn \c_sys_platform_str { #1 } }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
|