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
|
% \iffalse meta-comment
%
%% File: xtemplate.dtx (C) Copyright 1999 Frank Mittelbach, Chris Rowley,
%% David Carlisle
%% (C) Copyright 2004-2010 Frank Mittelbach,
%% The LaTeX3 Project
%% (C) Copyright 2011-2018 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 "l3packages 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|package>
% The version of expl3 required is tested as early as possible, as
% some really old versions do not define \ProvidesExplPackage.
\RequirePackage{expl3}[2018/02/21]
%<package>\@ifpackagelater{expl3}{2018/02/21}
%<package> {}
%<package> {%
%<package> \PackageError{xtemplate}{Support package l3kernel too old}
%<package> {%
%<package> Please install an up to date version of l3kernel\MessageBreak
%<package> using your TeX package manager or from CTAN.\MessageBreak
%<package> \MessageBreak
%<package> Loading xtemplate will abort!%
%<package> }%
%<package> \endinput
%<package> }
%</driver|package>
%<*driver>
\documentclass[full]{l3doc}
\usepackage{amstext}
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \textsf{xtemplate} package\\ Prototype document functions^^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 2018-10-17}
%
% \maketitle
%
% \begin{documentation}
%
% There are three broad \enquote{layers} between putting down ideas into
% a source file and ending up with a typeset document. These layers of
% document writing are
% \begin{enumerate}
% \item authoring of the text with mark-up;
% \item document layout design;
% \item implementation (with \TeX{} programming) of the design.
% \end{enumerate}
% We write the text as an author, and we see the visual output of the design
% after the document is generated; the \TeX{} implementation in the middle is
% the glue between the two.
%
% \LaTeX{}'s greatest success has been to standardise a system of mark-up that
% balances the trade-off between ease of reading and ease of writing to suit
% almost all forms of technical writing. It's
% other original strength was a good background in typographical design; while
% the standard \LaTeXe{} classes look somewhat dated now in terms of their
% visual design, their typography is generally sound. (Barring the occasional
% minor faults.)
%
% However, \LaTeXe{} has always lacked a standard approach to customising
% the visual design of a document. Changing the looks of the standard classes
% involved either:
% \begin{itemize}
% \item Creating a new version of the implementation code of the class and
% editing it.
% \item Loading one of the many packages to customise certain elements of
% the standard classes.
% \item Loading a completely different document class, such as
% \textsf{KOMA-Script} or \textsf{memoir}, that allows easy customisation.
% \end{itemize}
% All three of these approaches have their drawbacks and learning curves.
%
% The idea behind \pkg{xtemplate} is to cleanly separate the three layers
% introduced at the beginning of this section, so that document authors who
% are not programmers can easily change the design of their documents.
% \pkg{xtemplate} also makes it easier for \LaTeX{} programmers to provide
% their own customisations on top of a pre-existing class.
%
% \section{What is a document?}
%
% Besides the textual content of the words themselves, the source file
% of a document contains mark-up elements that add structure to the
% document. These elements include sectional divisions, figure/table
% captions, lists of various sorts, theorems/proofs, and so on.
% The list will be different for every document that can be written.
%
% Each element can be represented logically without worrying about the
% formatting, with mark-up such as \cs{section}, \cs{caption},
% |\begin{enumerate}| and so on. The output of each one of these
% document elements will be a typeset representation of the information
% marked up, and the visual arrangement and design of these elements
% can vary widely in producing a variety of desired outcomes.
%
% For each type of document element, there may be design variations that
% contain the same sort of information but present it in slightly
% different ways. For example, the difference between a numbered and an
% unnumbered section, \cs{section} and |\section*|, or the difference
% between an itemised list or an enumerated list.
%
% There are three distinct layers in the definition of
% \enquote{a document} at this level
% \begin{enumerate}
% \item semantic elements such as the ideas of sections and lists;
% \item a set of design solutions for representing these elements
% visually;
% \item specific variations for these designs that represent the
% elements in the document.
% \end{enumerate}
% In the parlance of the template system, these are called object types,
% templates, and instances, and they are discussed below in sections
% \ref{sec:objects}, \ref{sec:templates}, and~\ref{sec:instances},
% respectively.
%
% \section {Objects, templates, and instances}
%
% By formally declaring documents to be composed of mark-up elements
% grouped into objects, which are interpreted and typeset with a set of
% templates, each of which has one or more instances with which to
% compose each and every semantic unit of the text, we can cleanly
% separate the components of document construction.
%
% All of the structures provided by the template system are global,
% and do not respect \TeX{} grouping.
%
% \section{Object types}
% \label{sec:objects}
%
% An \emph{object type} (sometimes just \enquote{object}) is an
% abstract idea of a document element that takes a fixed number of
% arguments corresponding to the information from the document author
% that it is representing. A sectioning object, for example, might take
% three inputs: \enquote{title}, \enquote{short title}, and
% \enquote{label}.
%
% Any given document class will define which object types are to be
% used in the document, and any template of a given object type can be
% used to generate an instance for the object. (Of course, different
% templates will produce different typeset representations, but the
% underlying content will be the same.)
%
% \begin{function}{\DeclareObjectType}
% \begin{syntax}
% \cs{DeclareObjectType} \Arg{object type} \Arg{no. of args}
% \end{syntax}
% This function defines an \meta{object type} taking
% \meta{number of arguments}, where the \meta{object type} is an
% abstraction as discussed above. For example,
% \begin{verbatim}
% \DeclareObjectType{sectioning}{3}
% \end{verbatim}
% creates an object type \enquote{sectioning}, where each use of that
% object type will need three arguments.
% \end{function}
%
% \section{Templates}
% \label{sec:templates}
%
% A \emph{template} is a generalised design solution for representing
% the information of a specified object type. Templates that do the same
% thing, but in different ways, are grouped together by their object type
% and given separate names. There are two important parts to a template:
% \begin{itemize}
% \item the parameters it takes to vary the design it is producing;
% \item the implementation of the design.
% \end{itemize}
% As a document author or designer does not care about the
% implementation but rather only the interface to the template, these two
% aspects of the template definition are split into two independent
% declarations, \cs{DeclareTemplateInterface} and
% \cs{DeclareTemplateCode}.
%
% \begin{function}{\DeclareTemplateInterface}
% \begin{syntax}
% \cs{DeclareTemplateInterface}
% ~~\Arg{object type} \Arg{template} \Arg{no.~of args}
% ~~\Arg{key list}
% \end{syntax}
% A \meta{template} interface is declared for a particular
% \meta{object type}, where the \meta{number of arguments} must
% agree with the object type declaration. The interface itself is
% defined by the \meta{key list}, which is itself a key--value list
% taking a specialized format:
% \begin{quotation}
% \obeylines
% \noindent
% \meta{key1}~":"~\meta{key type1}~","
% \meta{key2}~":"~\meta{key type2}~","
% \meta{key3}~":"~\meta{key type3}~"="~\meta{default3}~","
% \meta{key4}~":"~\meta{key type4}~"="~\meta{default4}~","
% \ldots
% \end{quotation}
% Each \meta{key} name should consist of \textsc{ascii} characters,
% with the exception of |,|, |=| and \verb*| |. The recommended form
% for key names is to use lower case letters, with dashes to separate
% out different parts. Spaces are ignored in key names, so they can be
% included or missed out at will. Each \meta{key} must have a
% \meta{key type}, which defined the type of input that the \meta{key}
% requires. A full list of key types is given in
% Table~\ref{tab:key-types}. Each key may have a \meta{default}
% value, which will be used in by the template if the \meta{key} is
% not set explicitly. The \meta{default} should be of the correct
% form to be accepted by the \meta{key type} of the \meta{key}: this
% is not checked by the code.
% \end{function}
%
% \begin{table}
% \centering
% \begin{tabular}{>{\ttfamily}ll}
% \toprule
% \multicolumn{1}{l}{Key-type} & Description of input \\
% \midrule
% boolean & \texttt{true} or \texttt{false} \\
% choice\Arg{choices}
% & A list of pre-defined \meta{choices} \\
% code
% & Generalised key type: use |#1| as the input to the key \\
% commalist & A comma-separated list \\
% function\Arg{$N$}
% & A function definition with $N$ arguments
% ($N$ from $0$ to $9$) \\
% instance\Arg{name}
% & An instance of type \meta{name} \\
% integer & An integer or integer expression \\
% length & A fixed length \\
% muskip & A math length with shrink and stretch components \\
% real & A real (floating point) value \\
% skip & A length with shrink and stretch components \\
% tokenlist & A token list: any text or commands \\
% \bottomrule
% \end{tabular}
% \caption{Key-types for defining template interfaces with
% \cs{DeclareTemplateInterface}.}
% \label{tab:key-types}
% \end{table}
%
% \begin{function}{\KeyValue}
% \begin{syntax}
% \cs{KeyValue} \Arg{key name}
% \end{syntax}
% There are occasions where the default (or value) for one key
% should be taken from another. The \cs{KeyValue} function can be
% used to transfer this information without needing to know the
% internal implementation of the key:
% \begin{verbatim}
% \DeclareTemplateInterface { object } { template } { no. of args }
% {
% key-name-1 : key-type = value ,
% key-name-2 : key-type = \KeyValue { key-name-1 },
% ...
% }
% \end{verbatim}
% \end{function}
%
% \begin{function}{\DeclareTemplateCode}
% \begin{syntax}
% \cs{DeclareTemplateCode}
% ~~\Arg{object type} \Arg{template} \Arg{no.~of args}
% ~~\Arg{key bindings} \Arg{code}
% \end{syntax}
% The relationship between a templates keys and the internal
% implementation is created using the \cs{DeclareTemplateCode}
% function. As with \cs{DeclareTemplateInterface}, the
% \meta{template} name is given along with the \meta{object type}
% and \meta{number of arguments} required. The \meta{key bindings}
% argument is a key--value list which specifies the relationship
% between each \meta{key} of the template interface with an
% underlying\meta{variable}.
%
% \begin{quotation}
% \obeylines
% \noindent
% \meta{key1}~"="~\meta{variable1},
% \meta{key2}~"="~\meta{variable2},
% \meta{key3}~"="~global~\meta{variable3},
% \meta{key4}~"="~global~\meta{variable4},
% \ldots
% \end{quotation}
% With the exception of the choice, code and function key types,
% the \meta{variable} here should be the name of an existing
% \LaTeX3 register. As illustrated, the key word \enquote{global}
% may be included in the listing to indicate that the \meta{variable}
% should be assigned globally. A full list of variable bindings is
% given in Table~\ref{tab:key-vars}.
%
% The \meta{code} argument of \cs{DeclareTemplateCode} is used
% as the replacement text for the template when it is used, either
% directly or as an instance. This may therefore accept arguments
% |#1|, |#2|, \emph{etc}.~as detailed by the \meta{number of arguments}
% taken by the object type.
% \end{function}
%
% \begin{table}
% \centering
% \begin{tabular}{>{\ttfamily}ll}
% \toprule
% \multicolumn{1}{l}{Key-type} & Description of binding \\
% \midrule
% boolean & Boolean variable, \emph{e.g}.~\cs{l_tmpa_bool} \\
% choice
% & List of choice implementations
% (see Section~\ref{sec:choices-key}) \\
% code
% & \meta{code} using |#1| as input to the key \\
% commalist & Comma list, \emph{e.g}.~\cs{l_tmpa_clist} \\
% function
% & Function taking $N$ arguments, \emph{e.g}.~\cs{use_i:nn} \\
% instance \\
% integer & Integer variable, \emph{e.g}.~\cs{l_tmpa_int} \\
% length & Dimension variable, \emph{e.g}.~\cs{l_tmpa_dim} \\
% muskip & Muskip variable, \emph{e.g}.~\cs{l_tmpa_muskip} \\
% real & Floating-point variable, \emph{e.g}.~\cs{l_tmpa_fp} \\
% skip & Skip variable, \emph{e.g}.~\cs{l_tmpa_skip} \\
% tokenlist & Token list variable, \emph{e.g}.~\cs{l_tmpa_tl} \\
% \bottomrule
% \end{tabular}
% \caption{Bindings required for different key types when defining
% template implementations with \cs{DeclareTemplateCode}. Apart
% from \texttt{code}, \texttt{choice} and \texttt{function}
% all of these accept the key word \texttt{global} to carry
% out a global assignment.}
% \label{tab:key-vars}
% \end{table}
%
% \begin{function}{\AssignTemplateKeys}
% \begin{syntax}
% \cs{AssignTemplateKeys}
% \end{syntax}
% In the final argument of \cs{DeclareTemplateCode} the assignment of
% keys defined by the template is carried out by using the function
% \cs{AssignTemplateKeys}. Thus no keys are assigned if this is missing
% from the \meta{code} used.
% \end{function}
%
% \begin{function}{\EvaluateNow}
% \begin{syntax}
% \cs{EvaluteNow} \Arg{expression}
% \end{syntax}
% The standard method when creating an instance from a template is to
% evaluate the \meta{expression} when the instance is used. However, it may
% be desirable to calculate the value when declared, which can be
% forced using \cs{EvaluateNow}. Currently, this functionality is
% regarded as experimental: the team have not found an example where it
% is actually needed, and so it may be dropped \emph{if} no good
% examples are suggested!
% \end{function}
%
% \section{Multiple choices}
% \label{sec:choices-key}
%
% The \texttt{choice} key type implements multiple choice input. At the
% interface level, only the list of valid choices is needed:
% \begin{verbatim}
% \DeclareTemplateInterface { foo } { bar } { 0 }
% { key-name : choice { A, B, C } }
% \end{verbatim}
% where the choices are given as a comma-list (which must therefore
% be wrapped in braces). A default value can also be given:
% \begin{verbatim}
% \DeclareTemplateInterface { foo } { bar } { 0 }
% { key-name : choice { A, B, C } = A }
% \end{verbatim}
%
% At the implementation level, each choice is associated with code,
% using a nested key--value list.
% \begin{verbatim}
% \DeclareTemplateCode { foo } { bar } { 0 }
% {
% key-name =
% {
% A = Code-A ,
% B = Code-B ,
% C = Code-C
% }
% }
% { ... }
% \end{verbatim}
% The two choice lists should match, but in the implementation a
% special \texttt{unknown} choice is also available. This can be used
% to ignore values and implement an \enquote{else} branch:
% \begin{verbatim}
% \DeclareTemplateCode { foo } { bar } { 0 }
% {
% key-name =
% {
% A = Code-A ,
% B = Code-B ,
% C = Code-C ,
% unknown = Else-code
% }
% }
% { ... }
% \end{verbatim}
% The \texttt{unknown} entry must be the last one given, and should
% \emph{not} be listed in the interface part of the template.
%
% For keys which accept the values \texttt{true} and \texttt{false}
% both the boolean and choice key types can be used. As template
% interfaces are intended to prompt clarity at the design level, the
% boolean key type should be favoured, with the choice type reserved
% for keys which take arbitrary values.
%
% \section{Instances}
% \label{sec:instances}
%
% After a template is defined it still needs to be put to use. The
% parameters that it expects need to be defined before it can be used in
% a document. Every time a template has parameters given to it, an
% \emph{instance} is created, and this is the code that ends up in the
% document to perform the typesetting of whatever pieces of information
% are input into it.
%
% For example, a template might say \enquote{here is a section with or
% without a number that might be centred or left aligned and print its
% contents in a certain font of a certain size, with a bit of a gap
% before and after it} whereas an instance declares \enquote{this is a
% section with a number, which is centred and set in $12\,\text{pt}$
% italic with a $10\,\text{pt}$ skip before and a
% $12\,\text{pt}$ skip after it}. Therefore, an instance is just a
% frozen version of a template with specific settings as chosen by the
% designer.
%
% \begin{function}{\DeclareInstance}
% \begin{syntax}
% \cs{DeclareInstance}
% ~~\Arg{object type} \Arg{instance} \Arg{template} \Arg{parameters}
% \end{syntax}
% This function uses a \meta{template} for an \meta{object type}
% to create an \meta{instance}. The \meta{instance} will be set
% up using the \meta{parameters}, which will set some of the
% \meta{keys} in the \meta{template}.
%
% As a practical example, consider an object type for document sections
% (which might include chapters, parts, sections, \emph{etc}.), which
% is called \texttt{sectioning}. One possible template for this
% object type might be called \texttt{basic}, and one instance of this
% template would be a numbered section. The instance declaration might
% read:
% \begin{verbatim}
% \DeclareInstance { sectioning } { section-num } { basic }
% {
% numbered = true ,
% justification = center ,
% font =\normalsize\itshape ,
% before-skip = 10pt ,
% after-skip = 12pt ,
% }
% \end{verbatim}
% Of course, the key names here are entirely imaginary, but illustrate
% the general idea of fixing some settings.
% \end{function}
%
% \begin{function}{\IfInstanceExistT, \IfInstanceExistF, \IfInstanceExistTF}
% \begin{syntax}
% \cs{IfInstanceExistTF} \Arg{object type} \Arg{instance} \Arg{true code} \Arg{false code}
% \end{syntax}
% Tests if the named \meta{instance} of a \meta{object type} exists, and
% then inserts the appropriate code into the input stream.
% \end{function}
%
% \section{Document interface}
%
% After the instances have been chosen, document commands must be
% declared to use those instances in the document. \cs{UseInstance}
% calls instances directly, and this command should be used internally
% in document-level mark-up.
%
% \begin{function}{\UseInstance}
% \begin{syntax}
% \cs{UseInstance}
% ~~\Arg{object type} \Arg{instance} \meta{arguments}
% \end{syntax}
% Uses an \meta{instance} of the \meta{object type}, which will require
% \meta{arguments} as determined by the number specified for the
% \meta{object type}. The \meta{instance} must have been declared
% before it can be used, otherwise an error is raised.
% \end{function}
%
% \begin{function}{\UseTemplate}
% \begin{syntax}
% \cs{UseTemplate} \Arg{object type} \Arg{template}
% ~~\Arg{settings} \meta{arguments}
% \end{syntax}
% Uses the \meta{template} of the specified \meta{object type},
% applying the \meta{settings} and absorbing \meta{arguments} as
% detailed by the \meta{object type} declaration. This in effect
% is the same as creating an instance using \cs{DeclareInstance}
% and immediately using it with \cs{UseInstance}, but without the
% instance having any further existence. It is therefore useful where
% a template needs to be used once.
%
% This function can also be used as the argument to \texttt{instance}
% key types:
% \begin{verbatim}
% \DeclareInstance { object } { template } { instance }
% {
% instance-key =
% \UseTemplate { object2 } { template2 } { <settings> }
% }
% \end{verbatim}
% \end{function}
%
% \section{Changing existing definitions}
%
% Template parameters may be assigned specific defaults for instances
% to use if the instance declaration doesn't explicit set those
% parameters. In some cases, the document designer will wish to edit
% these defaults to allow them to \enquote{cascade} to the instances.
% The alternative would be to set each parameter identically for each
% instance declaration, a tedious and error-prone process.
%
% \begin{function}{\EditTemplateDefaults}
% \begin{syntax}
% \cs{EditTemplateDefaults}
% ~~\Arg{object type} \Arg{template} \Arg{new defaults}
% \end{syntax}
% Edits the \meta{defaults} for a \meta{template} for an
% \meta{object type}. The \meta{new defaults}, given as a key--value
% list, replace the existing defaults for the \meta{template}. This
% means that the change will apply to instances declared after the
% editing, but that instances which have already been created are
% unaffected.
% \end{function}
%
% \begin{function}{\EditInstance}
% \begin{syntax}
% \cs{EditInstance}
% ~~\Arg{object type} \Arg{instance} \Arg{new values}
% \end{syntax}
% Edits the \meta{values} for an \meta{instance} for an
% \meta{object type}. The \meta{new values}, given as a key--value
% list, replace the existing values for the \meta{instance}. This
% function is complementary to \cs{EditTemplateDefaults}:
% \cs{EditInstance} changes a single instance while leaving the
% template untouched.
% \end{function}
%
% \section{When template parameters should be frozen}
%
% A class designer may be inheriting templates declared by someone else,
% either third-party code or the \LaTeX{} kernel itself. Sometimes these
% templates will be overly general for the purposes of the document.
% The user should be able to customise parts of the template instances,
% but otherwise be restricted to only those parameters allowed by the
% designer.
%
% \begin{function}{\DeclareRestrictedTemplate}
% \begin{syntax}
% \cs{DeclareRestrictedTemplate}
% ~~\Arg{object type} \Arg{parent template} \Arg{new template}
% ~~\Arg{parameters}
% \end{syntax}
% Creates a copy of the \meta{parent template} for the
% \meta{object type} called \meta{new template}. The key--value list
% of \meta{parameters} applies in the \meta{new template} and cannot
% be changed when creating an instance.
% \end{function}
%
% \section{Getting information about templates and instances}
%
% \begin{function}{\ShowInstanceValues}
% \begin{syntax}
% \cs{ShowInstanceValues} \Arg{object type} \Arg{instance}
% \end{syntax}
% Shows the \meta{values} for an \meta{instance} of the given
% \meta{object type} at the terminal.
% \end{function}
%
% \begin{function}{\ShowTemplateCode}
% \begin{syntax}
% \cs{ShowTemplateCode} \Arg{object type} \Arg{template}
% \end{syntax}
% Shows the \meta{code} of a \meta{template} for an \meta{object type}
% in the terminal.
% \end{function}
%
% \begin{function}{\ShowTemplateDefaults}
% \begin{syntax}
% \cs{ShowTemplateDefaults} \Arg{object type} \Arg{template}
% \end{syntax}
% Shows the \meta{default} values of a \meta{template} for an
% \meta{object type} in the terminal.
% \end{function}
%
% \begin{function}{\ShowTemplateInterface}
% \begin{syntax}
% \cs{ShowTemplateInterface} \Arg{object type} \Arg{template}
% \end{syntax}
% Shows the \meta{keys} and associated \meta{key types} of a
% \meta{template} for an \meta{object type} in the terminal.
% \end{function}
%
% \begin{function}{\ShowTemplateVariables}
% \begin{syntax}
% \cs{ShowTemplateVariables} \Arg{object type} \Arg{template}
% \end{syntax}
% Shows the \meta{variables} and associated \meta{keys} of a
% \meta{template} for an \meta{object type} in the terminal. Note that
% \texttt{code} and \texttt{choice} keys do not map directly to variables
% but to arbitrary code. For \texttt{choice} keys, each valid choice
% is shown as a separate entry in the list, with the key name and choice
% separated by a space, for example
% \begin{verbatim}
% Template 'example' of object type 'example' has variable mapping:
% > demo unknown => \def \demo {?}
% > demo c => \def \demo {c}
% > demo b => \def \demo {b}
% > demo a => \def \demo {a}.
% \end{verbatim}
% would be shown for a choice key \texttt{demo} with valid choices
% \texttt{a}, \texttt{b} and \texttt{c}, plus code for an \texttt{unknown}
% branch.
% \end{function}
%
% \section{Collections}
%
% The implementation of templates includes a concept termed
% \enquote{collections}. The idea is that by activating a collection, a
% set of instances can rapidly be set up. An example use case would be
% collections for \texttt{frontmatter}, \texttt{mainmatter} and
% \texttt{backmatter} in a book. This mechanism is currently implemented
% by the commands \cs{DeclareCollectionInstance}, \cs{EditCollectionInstance}
% and \cs{UseCollection}. However, while the idea of switchable instances is
% a useful one, the team feel that collections are not the correct way to
% achieve this, at least with the current approach. As such, the collection
% functions should be regarded as deprecated: they remain available to support
% existing code, but will be removed when a better mechanism is developed.
%
%
% \begin{function}{\ShowCollectionInstanceValues}
% \begin{syntax}
% \cs{ShowInstanceValues} \Arg{collection} \Arg{object type} \Arg{instance}
% \end{syntax}
% Shows the \meta{values} for an \meta{instance} within
% a \meta{collection} of the given \meta{object type} at the terminal.
% As for other collection commands, this should be regarded as deprecated.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{xtemplate} Implementation}
%
% \begin{macrocode}
%<*package>
% \end{macrocode}
%
% \begin{macrocode}
%<@@=xtemplate>
% \end{macrocode}
%
% \begin{macrocode}
\ProvidesExplPackage{xtemplate}{2018-10-17}{}
{L3 Experimental prototype document functions}
% \end{macrocode}
%
% \subsection{Variables and constants}
%
% \begin{variable}{\c_@@_code_root_tl}
% \begin{variable}{\c_@@_defaults_root_tl}
% \begin{variable}{\c_@@_instances_root_tl}
% \begin{variable}{\c_@@_keytypes_root_tl}
% \begin{variable}{\c_@@_key_order_root_tl}
% \begin{variable}{\c_@@_restrict_root_tl}
% \begin{variable}{\c_@@_values_root_tl}
% \begin{variable}{\c_@@_vars_root_tl}
% So that literal values are kept to a minimum.
% \begin{macrocode}
\tl_const:Nn \c_@@_code_root_tl { template~code~>~ }
\tl_const:Nn \c_@@_defaults_root_tl { template~defaults~>~ }
\tl_const:Nn \c_@@_instances_root_tl { template~instance~>~ }
\tl_const:Nn \c_@@_keytypes_root_tl { template~key~types~>~ }
\tl_const:Nn \c_@@_key_order_root_tl { template~key~order~>~ }
\tl_const:Nn \c_@@_restrict_root_tl { template~restrictions~>~ }
\tl_const:Nn \c_@@_values_root_tl { template~values~>~ }
\tl_const:Nn \c_@@_vars_root_tl { template~vars~>~ }
% \end{macrocode}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
%
% \begin{variable}{\c_@@_keytypes_arg_seq}
% A list of keytypes which also need additional data (an argument),
% used to parse the keytype correctly. We suspend debugging to allow
% an assignment to a constant.
% \begin{macrocode}
\seq_const_from_clist:Nn \c_@@_keytypes_arg_seq
{ choice , function , instance }
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_object_type_prop}
% For storing types and the associated number of arguments.
% \begin{macrocode}
\prop_new:N \g_@@_object_type_prop
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_assignments_tl}
% When creating an instance, the assigned values are collected here.
% \begin{macrocode}
\tl_new:N \l_@@_assignments_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_collection_tl}
% The current instance collection name is stored here.
% \begin{macrocode}
\tl_new:N \l_@@_collection_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_collections_prop}
% Lists current collection in force, indexed by object type.
% \begin{macrocode}
\prop_new:N \l_@@_collections_prop
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\l_@@_default_tl}
% The default value for a key is recovered here from the property list
% in which it is stored. The internal implementation of property lists
% means that this is safe even with un-escaped |#| tokens.
% \begin{macrocode}
\tl_new:N \l_@@_default_tl
% \end{macrocode}
%\ end{macro}
%
% \begin{variable}{\l_@@_error_bool}
% A flag for errors to be carried forward.
% \begin{macrocode}
\bool_new:N \l_@@_error_bool
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_global_bool}
% Used to indicate that assignments should be global.
% \begin{macrocode}
\bool_new:N \l_@@_global_bool
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_restrict_bool}
% A flag to indicate that a template is being restricted.
% \begin{macrocode}
\bool_new:N \l_@@_restrict_bool
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_restrict_clist}
% A scratch list for restricting templates.
% \begin{macrocode}
\clist_new:N \l_@@_restrict_clist
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_key_name_tl}
% \begin{variable}{\l_@@_keytype_tl}
% \begin{variable}{\l_@@_keytype_arg_tl}
% \begin{variable}{\l_@@_value_tl}
% \begin{variable}{\l_@@_var_tl}
% When defining each key in a template, the name and type of the key
% need to be separated and stored. Any argument needed by the
% keytype is also stored separately.
% \begin{macrocode}
\tl_new:N \l_@@_key_name_tl
\tl_new:N \l_@@_keytype_tl
\tl_new:N \l_@@_keytype_arg_tl
\tl_new:N \l_@@_value_tl
\tl_new:N \l_@@_var_tl
% \end{macrocode}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
%
% \begin{variable}{\l_@@_keytypes_prop}
% \begin{variable}{\l_@@_key_order_seq}
% \begin{variable}{\l_@@_values_prop}
% \begin{variable}{\l_@@_vars_prop}
% To avoid needing too many difficult-to-follow csname assignments,
% various scratch token registers are used to build up data, which is
% then transferred
% \begin{macrocode}
\prop_new:N \l_@@_keytypes_prop
\seq_new:N \l_@@_key_order_seq
\prop_new:N \l_@@_values_prop
\prop_new:N \l_@@_vars_prop
% \end{macrocode}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
%
% \begin{variable}{\l_@@_tmp_clist}
% \begin{variable}{\l_@@_tmp_dim}
% \begin{variable}{\l_@@_tmp_int}
% \begin{variable}{\l_@@_tmp_muskip}
% \begin{variable}{\l_@@_tmp_skip}
% For pre-processing the data stored by \pkg{xtemplate}, a number of
% scratch variables are needed. The assignments are made to these in the
% first instance, unless evaluation is delayed.
% \begin{macrocode}
\clist_new:N \l_@@_tmp_clist
\dim_new:N \l_@@_tmp_dim
\int_new:N \l_@@_tmp_int
\muskip_new:N \l_@@_tmp_muskip
\skip_new:N \l_@@_tmp_skip
% \end{macrocode}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
% \end{variable}
%
% \begin{variable}{\l_@@_tmp_tl}
% A scratch variable for comparisons and so on.
% \begin{macrocode}
\tl_new:N \l_@@_tmp_tl
% \end{macrocode}
% \end{variable}
%
% \subsection{Variant of prop functions}
%
% \begin{macro}[TF]{\prop_get:NoN}
% In some cases, we need to expand the key, and get the corresponding
% value in a property list if it exists.
% \begin{macrocode}
\cs_generate_variant:Nn \prop_get:NnNTF { No }
\cs_generate_variant:Nn \prop_get:NnNT { No }
\cs_generate_variant:Nn \prop_get:NnNF { No }
% \end{macrocode}
% \end{macro}
%
% \subsection{Testing existence and validity}
%
% There are a number of checks needed for either the existence of
% a object type, template or instance. There are also some for the
% validity of a particular call. All of these are collected up here.
%
% \begin{macro}{\@@_execute_if_arg_agree:nnT}
% A test agreement between the number of arguments for the template
% type and that specified when creating a template. This is not done as a
% separate conditional for efficiency and better error message
% \begin{macrocode}
\cs_new_protected:Npn \@@_execute_if_arg_agree:nnT #1#2#3
{
\prop_get:NnN \g_@@_object_type_prop {#1} \l_@@_tmp_tl
\int_compare:nNnTF {#2} = \l_@@_tmp_tl
{#3}
{
\msg_error:nnxxx { xtemplate }
{ argument-number-mismatch } {#1} { \l_@@_tmp_tl } {#2}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_execute_if_code_exist:nnT}
% A template is only fully declared if the code has been set up,
% which can be checked by looking for the template function itself.
% \begin{macrocode}
\cs_new_protected:Npn \@@_execute_if_code_exist:nnT #1#2#3
{
\cs_if_exist:cTF { \c_@@_code_root_tl #1 / #2 }
{#3}
{
\msg_error:nnxx { xtemplate } { no-template-code }
{#1} {#2}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_execute_if_keytype_exist:nT}
% \begin{macro}{\@@_execute_if_keytype_exist:oT}
% The test for valid keytypes looks for a function to set up the key,
% which is part of the \enquote{code} side of the template definition.
% This avoids having different lists for the two parts of the process.
% \begin{macrocode}
\cs_new_protected:Npn \@@_execute_if_keytype_exist:nT #1#2
{
\cs_if_exist:cTF { @@_store_value_ #1 :n }
{#2}
{ \msg_error:nnx { xtemplate } { unknown-keytype } {#1} }
}
\cs_generate_variant:Nn \@@_execute_if_keytype_exist:nT { o }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_execute_if_type_exist:nT}
% To check that a particular object type is valid.
% \begin{macrocode}
\cs_new_protected:Npn \@@_execute_if_type_exist:nT #1#2
{
\prop_if_in:NnTF \g_@@_object_type_prop {#1}
{#2}
{ \msg_error:nnx { xtemplate } { unknown-object-type } {#1} }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_execute_if_keys_exist:nnT}
% To check that the keys for a template have been set up before trying
% to create any code, a simple check for the correctly-named keytype
% property list.
% \begin{macrocode}
\cs_new_protected:Npn \@@_if_keys_exist:nnT #1#2#3
{
\cs_if_exist:cTF { \c_@@_keytypes_root_tl #1 / #2 }
{#3}
{
\msg_error:nnxx { xtemplate } { unknown-template }
{#1} {#2}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[TF]{\@@_if_key_value:n, \@@_if_key_value:o}
% Tests for the first token in a string being \cs{KeyValue}, where
% \cs{EvaluateNow} is not important.
% \begin{macrocode}
\prg_new_conditional:Npnn \@@_if_key_value:n #1 { T , F , TF }
{
\str_if_eq:noTF { \KeyValue } { \tl_head:w #1 \q_nil \q_stop }
{ \prg_return_true: }
{ \prg_return_false: }
}
\cs_generate_variant:Nn \@@_if_key_value:nT { o }
\cs_generate_variant:Nn \@@_if_key_value:nF { o }
\cs_generate_variant:Nn \@@_if_key_value:nTF { o }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_if_eval_now:nTF}
% Tests for the first token in a string being \cs{EvaluateNow}.
% \begin{macrocode}
\prg_new_conditional:Npnn \@@_if_eval_now:n #1 { TF }
{
\str_if_eq:noTF { \EvaluateNow } { \tl_head:w #1 \q_nil \q_stop }
{ \prg_return_true: }
{ \prg_return_false: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[TF]{\@@_if_instance_exist:nnn}
% Testing for an instance is collection dependent.
% \begin{macrocode}
\prg_new_conditional:Npnn \@@_if_instance_exist:nnn #1#2#3
{ T, F, TF }
{
\cs_if_exist:cTF { \c_@@_instances_root_tl #1 / #2 / #3 }
{ \prg_return_true: }
{ \prg_return_false: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_if_use_template:nTF}
% Tests for the first token in a string being \cs{UseTemplate}.
% \begin{macrocode}
\prg_new_conditional:Npnn \@@_if_use_template:n #1 { TF }
{
\str_if_eq:noTF { \UseTemplate } { \tl_head:w #1 \q_nil \q_stop }
{ \prg_return_true: }
{ \prg_return_false: }
}
% \end{macrocode}
% \end{macro}
%
% \subsection{Saving and recovering property lists}
%
% The various property lists for templates have to be shuffled in
% and out of storage.
%
% \begin{macro}{\@@_store_defaults:n}
% \begin{macro}{\@@_store_keytypes:n}
% \begin{macro}{\@@_store_restrictions:n}
% \begin{macro}{\@@_store_values:n}
% \begin{macro}{\@@_store_vars:n}
% The defaults and keytypes are transferred from the scratch property
% lists to the \enquote{proper} lists for the template being created.
% \begin{macrocode}
\cs_new_protected:Npn \@@_store_defaults:n #1
{
\prop_gclear_new:c { \c_@@_defaults_root_tl #1 }
\prop_gset_eq:cN { \c_@@_defaults_root_tl #1 }
\l_@@_values_prop
}
\cs_new_protected:Npn \@@_store_keytypes:n #1
{
\prop_gclear_new:c { \c_@@_keytypes_root_tl #1 }
\prop_gset_eq:cN { \c_@@_keytypes_root_tl #1 }
\l_@@_keytypes_prop
\seq_gclear_new:c { \c_@@_key_order_root_tl #1 }
\seq_gset_eq:cN { \c_@@_key_order_root_tl #1 }
\l_@@_key_order_seq
}
\cs_new_protected:Npn \@@_store_values:n #1
{
\prop_clear_new:c { \c_@@_values_root_tl #1 }
\prop_set_eq:cN { \c_@@_values_root_tl #1 }
\l_@@_values_prop
}
\cs_new_protected:Npn \@@_store_restrictions:n #1
{
\clist_gclear_new:c { \c_@@_restrict_root_tl #1 }
\clist_gset_eq:cN { \c_@@_restrict_root_tl #1 }
\l_@@_restrict_clist
}
\cs_new_protected:Npn \@@_store_vars:n #1
{
\prop_gclear_new:c { \c_@@_vars_root_tl #1 }
\prop_gset_eq:cN { \c_@@_vars_root_tl #1 }
\l_@@_vars_prop
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_recover_defaults:n}
% \begin{macro}{\@@_recover_keytypes:n}
% \begin{macro}{\@@_recover_restrictions:n}
% \begin{macro}{\@@_recover_values:n}
% \begin{macro}{\@@_recover_vars:n}
% Recovering the stored data for a template is rather less complex
% than storing it. All that happens is the data is transferred from
% the permanent to the scratch storage. However, we need to check the
% scratch storage does exist.
% \begin{macrocode}
\cs_new_protected:Npn \@@_recover_defaults:n #1
{
\prop_if_exist:cTF
{ \c_@@_defaults_root_tl #1 }
{
\prop_set_eq:Nc \l_@@_values_prop
{ \c_@@_defaults_root_tl #1 }
}
{ \prop_clear:N \l_@@_values_prop }
}
\cs_new_protected:Npn \@@_recover_keytypes:n #1
{
\prop_if_exist:cTF
{ \c_@@_keytypes_root_tl #1 }
{
\prop_set_eq:Nc \l_@@_keytypes_prop
{ \c_@@_keytypes_root_tl #1 }
}
{ \prop_clear:N \l_@@_keytypes_prop }
\seq_if_exist:cTF { \c_@@_key_order_root_tl #1 }
{
\seq_set_eq:Nc \l_@@_key_order_seq
{ \c_@@_key_order_root_tl #1 }
}
{ \seq_clear:N \l_@@_key_order_seq }
}
\cs_new_protected:Npn \@@_recover_restrictions:n #1
{
\clist_if_exist:cTF
{ \c_@@_restrict_root_tl #1 }
{
\clist_set_eq:Nc \l_@@_restrict_clist
{ \c_@@_restrict_root_tl #1 }
}
{ \clist_clear:N \l_@@_restrict_clist }
}
\cs_new_protected:Npn \@@_recover_values:n #1
{
\prop_if_exist:cTF
{ \c_@@_values_root_tl #1 }
{
\prop_set_eq:Nc \l_@@_values_prop
{ \c_@@_values_root_tl #1 }
}
{ \prop_clear:N \l_@@_values_prop }
}
\cs_new_protected:Npn \@@_recover_vars:n #1
{
\prop_if_exist:cTF
{ \c_@@_vars_root_tl #1 }
{
\prop_set_eq:Nc \l_@@_vars_prop
{ \c_@@_vars_root_tl #1 }
}
{ \prop_clear:N \l_@@_vars_prop }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Creating new object types}
%
% \begin{macro}{\@@_declare_object_type:nn}
% Although the object type is the \enquote{top level} of the template
% system, it is actually very easy to implement. All that happens is that
% the number of arguments required is recorded, indexed by the name of the
% object type.
% \begin{macrocode}
\cs_new_protected:Npn \@@_declare_object_type:nn #1#2
{
\int_set:Nn \l_@@_tmp_int {#2}
\int_compare:nTF { 0 <= \l_@@_tmp_int <= 9 }
{
\msg_info:nnxx { xtemplate } { declare-object-type }
{#1} { \exp_not:V \l_@@_tmp_int }
\prop_gput:NnV \g_@@_object_type_prop {#1}
\l_@@_tmp_int
}
{
\msg_error:nnxx { xtemplate } { bad-number-of-arguments }
{#1} { \exp_not:V \l_@@_tmp_int }
}
}
% \end{macrocode}
% \end{macro}
%
% \subsection{Design part of template declaration}
%
% The \enquote{design} part of a template declaration defines the general
% behaviour of each key, and possibly a default value. However, it does
% not include the implementation. This means that what happens here is
% the two properties are saved to appropriate lists, which can then
% be used later to recover the information when implementing the keys.
%
% \begin{macro}{\@@_declare_template_keys:nnnn}
% The main function for the \enquote{design} part of creating a template
% starts by checking that the object type exists and that the number of
% arguments required agree. If that is all fine, then the two storage
% areas for defaults and keytypes are initialised. The mechanism is then
% set up for the \pkg{l3keys} module to actually parse the keys.
% Finally, the code hands of to the storage routine to save the parsed
% information properly.
% \begin{macrocode}
\cs_new_protected:Npn \@@_declare_template_keys:nnnn #1#2#3#4
{
\@@_execute_if_type_exist:nT {#1}
{
\@@_execute_if_arg_agree:nnT {#1} {#3}
{
\prop_clear:N \l_@@_values_prop
\prop_clear:N \l_@@_keytypes_prop
\seq_clear:N \l_@@_key_order_seq
\keyval_parse:NNn
\@@_parse_keys_elt:n \@@_parse_keys_elt:nn {#4}
\@@_store_defaults:n { #1 / #2 }
\@@_store_keytypes:n { #1 / #2 }
}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_parse_keys_elt:n}
% \begin{macro}{\@@_parse_keys_elt_aux:n}
% \begin{macro}{\@@_parse_keys_elt_aux:}
% Processing the key part of the key--value pair is always carried out
% using this function, even if a value was found. First, the key name
% is separated from the keytype, and if necessary the keytype is
% separated into two parts. This information is then used to check that
% the keytype is valid, before storing the keytype (plus argument if
% necessary) as a property of the key name. The key name is also stored
% (in braces) in the token list to record the order the keys are defined
% in.
% \begin{macrocode}
\cs_new_protected:Npn \@@_parse_keys_elt:n #1
{
\@@_split_keytype:n {#1}
\bool_if:NF \l_@@_error_bool
{
\@@_execute_if_keytype_exist:oT \l_@@_keytype_tl
{
\seq_map_function:NN \c_@@_keytypes_arg_seq
\@@_parse_keys_elt_aux:n
\bool_if:NF \l_@@_error_bool
{
\seq_if_in:NoTF \l_@@_key_order_seq
\l_@@_key_name_tl
{
\msg_error:nnx { xtemplate }
{ duplicate-key-interface }
{ \l_@@_key_name_tl }
}
{ \@@_parse_keys_elt_aux: }
}
}
}
}
\cs_new_protected:Npn \@@_parse_keys_elt_aux:n #1
{
\str_if_eq:onT \l_@@_keytype_tl {#1}
{
\tl_if_empty:NT \l_@@_keytype_arg_tl
{
\msg_error:nnx { xtemplate }
{ keytype-requires-argument } {#1}
\bool_set_true:N \l_@@_error_bool
\seq_map_break:
}
}
}
\cs_new:Npn \@@_parse_keys_elt_aux:
{
\tl_set:Nx \l_@@_tmp_tl
{
\l_@@_keytype_tl
\tl_if_empty:NF \l_@@_keytype_arg_tl
{ { \l_@@_keytype_arg_tl } }
}
\prop_put:Noo \l_@@_keytypes_prop \l_@@_key_name_tl
\l_@@_tmp_tl
\seq_put_right:No \l_@@_key_order_seq \l_@@_key_name_tl
\str_if_eq:onT \l_@@_keytype_tl { choice }
{
\clist_if_in:NnT \l_@@_keytype_arg_tl { unknown }
{ \msg_error:nn { xtemplate } { choice-unknown-reserved } }
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_parse_keys_elt:nn}
% For keys which have a default, the keytype and key name are first
% separated out by the \cs{@@_parse_keys_elt:n}
% routine, before storing the default value in the scratch property list.
% \begin{macrocode}
\cs_new_protected:Npn \@@_parse_keys_elt:nn #1#2
{
\@@_parse_keys_elt:n {#1}
\use:c { @@_store_value_ \l_@@_keytype_tl :n } {#2}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_split_keytype:n}
% \begin{macro}{\@@_split_keytype_aux:w}
% The keytype and key name should be separated by |:|. As the
% definition might be given inside or outside of a code block, spaces
% are removed and the category code of colons is standardised. After
% that, the standard delimited argument method is used to separate the
% two parts.
% \begin{macrocode}
\cs_new_protected:Npx \@@_split_keytype:n #1
{
\exp_not:N \bool_set_false:N \exp_not:N \l_@@_error_bool
\tl_set:Nn \exp_not:N \l_@@_tmp_tl {#1}
\tl_remove_all:Nn \exp_not:N \l_@@_tmp_tl { ~ }
\tl_replace_all:Nnn \exp_not:N \l_@@_tmp_tl { : } { \token_to_str:N : }
\tl_if_in:onTF \exp_not:N \l_@@_tmp_tl { \token_to_str:N : }
{
\exp_not:n
{
\tl_clear:N \l_@@_key_name_tl
\exp_after:wN \@@_split_keytype_aux:w
\l_@@_tmp_tl \q_stop
}
}
{
\exp_not:N \bool_set_true:N \exp_not:N \l_@@_error_bool
\msg_error:nnx { xtemplate } { missing-keytype } {#1}
}
}
\use:x
{
\cs_new_protected:Npn \exp_not:N \@@_split_keytype_aux:w
##1 \token_to_str:N : ##2 \exp_not:N \q_stop
{
\tl_put_right:Nx \exp_not:N \l_@@_key_name_tl
{ \exp_not:N \tl_to_str:n {##1} }
\tl_if_in:nnTF {##2} { \token_to_str:N : }
{
\tl_put_right:Nn \exp_not:N \l_@@_key_name_tl
{ \token_to_str:N : }
\exp_not:N \@@_split_keytype_aux:w ##2 \exp_not:N \q_stop
}
{
\exp_not:N \tl_if_empty:NTF \exp_not:N \l_@@_key_name_tl
{
\msg_error:nnx { xtemplate } { empty-key-name }
{ \token_to_str:N : ##2 }
}
{ \exp_not:N \@@_split_keytype_arg:n {##2} }
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_split_keytype_arg:n, \@@_split_keytype_arg:o}
% \begin{macro}{\@@_split_keytype_arg_aux:n}
% \begin{macro}{\@@_split_keytype_arg_aux:w}
% The second stage of sorting out the keytype is to check for an
% argument. As there is no convenient delimiting token to look for,
% a check is made instead for each possible text value for the keytype.
% To keep things faster, this only involves the keytypes that need an
% argument. If a match is made, then a check is also needed to see that
% it is at the start of the keytype information. All being well, the
% split can then be applied. Any non-matching keytypes are assumed to
% be \enquote{correct} as given, and are left alone (this is checked by
% other code).
% \begin{macrocode}
\cs_new_protected:Npn \@@_split_keytype_arg:n #1
{
\tl_set:Nn \l_@@_keytype_tl {#1}
\tl_clear:N \l_@@_keytype_arg_tl
\cs_set_protected:Npn \@@_split_keytype_arg_aux:n ##1
{
\tl_if_in:nnT {#1} {##1}
{
\cs_set:Npn \@@_split_keytype_arg_aux:w
####1 ##1 ####2 \q_stop
{
\tl_if_empty:nT {####1}
{
\tl_set:Nn \l_@@_keytype_tl {##1}
\tl_set:Nn \l_@@_keytype_arg_tl {####2}
\seq_map_break:
}
}
\@@_split_keytype_arg_aux:w #1 \q_stop
}
}
\seq_map_function:NN \c_@@_keytypes_arg_seq
\@@_split_keytype_arg_aux:n
}
\cs_generate_variant:Nn \@@_split_keytype_arg:n { o }
\cs_new:Npn \@@_split_keytype_arg_aux:n #1 { }
\cs_new:Npn \@@_split_keytype_arg_aux:w #1 \q_stop { }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsubsection{Storing values}
%
% As \pkg{xtemplate} pre-processes key values for efficiency reasons,
% there is a need to convert the values given as defaults into
% \enquote{ready to use} data. The same general idea is true when an instance
% is declared. However, assignments are not made until an instance is
% used, and so there has to be some intermediate storage. Furthermore,
% the ability to delay evaluation of results is needed. To achieve these
% aims, a series of \enquote{process and store} functions are defined here.
%
% All of the information about the key (the key name and the keytype)
% is already stored as variables. The same property list is always used
% to store the data, meaning that the only argument required is the
% value to be processed and potentially stored.
%
% \begin{macro}{\@@_store_value_boolean:n}
% Storing Boolean values requires a test for delayed evaluation, but
% is different to the various numerical variable types as there are
% only two possible values to store. So the code here tests the default
% switch and then records the meaning (either \texttt{true} or
% \texttt{false}).
% \begin{macrocode}
\cs_new_protected:Npn \@@_store_value_boolean:n #1
{
\@@_if_eval_now:nTF {#1}
{
\bool_if:cTF { c_ #1 _bool }
{
\prop_put:Non \l_@@_values_prop \l_@@_key_name_tl
{ true }
}
{
\prop_put:Non \l_@@_values_prop \l_@@_key_name_tl
{ false }
}
}
{
\prop_put:Non \l_@@_values_prop \l_@@_key_name_tl {#1}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_store_value_code:n}
% \begin{macro}{\@@_store_value_choice:n}
% \begin{macro}{\@@_store_value_commalist:n}
% \begin{macro}{\@@_store_value_function:n}
% \begin{macro}{\@@_store_value_instance:n}
% \begin{macro}{\@@_store_value_real:n}
% \begin{macro}{\@@_store_value_tokenlist:n}
% With no need to worry about delayed evaluation, these keytypes all
% just store the input directly.
% \begin{macrocode}
\cs_new_protected:Npn \@@_store_value_code:n #1
{ \prop_put:Non \l_@@_values_prop \l_@@_key_name_tl {#1} }
\cs_new_eq:NN \@@_store_value_choice:n \@@_store_value_code:n
\cs_new_eq:NN \@@_store_value_commalist:n \@@_store_value_code:n
\cs_new_eq:NN \@@_store_value_function:n \@@_store_value_code:n
\cs_new_eq:NN \@@_store_value_instance:n \@@_store_value_code:n
\cs_new_eq:NN \@@_store_value_real:n \@@_store_value_code:n
\cs_new_eq:NN \@@_store_value_tokenlist:n \@@_store_value_code:n
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_store_value_integer:n}
% \begin{macro}{\@@_store_value_length:n}
% \begin{macro}{\@@_store_value_muskip:n}
% \begin{macro}{\@@_store_value_skip:n}
% Storing the value of a number is in all cases more or less the same.
% If evaluation is taking place now, assignment is made to a scratch
% variable, and this result is then stored. On the other hand, if
% evaluation is delayed the current data is simply stored \enquote{as is}.
% \begin{macrocode}
\cs_new_protected:Npn \@@_store_value_integer:n #1
{
\@@_if_eval_now:nTF {#1}
{
\int_set:Nn \l_@@_tmp_int {#1}
\prop_put:NVV \l_@@_values_prop \l_@@_key_name_int
\l_@@_tmp_int
}
{
\prop_put:Non \l_@@_values_prop \l_@@_key_name_tl {#1}
}
}
\cs_new_protected:Npn \@@_store_value_length:n #1
{
\@@_if_eval_now:nTF {#1}
{
\dim_set:Nn \l_@@_tmp_dim {#1}
\prop_put:NVV \l_@@_values_prop \l_@@_key_name_tl
\l_@@_tmp_dim
}
{
\prop_put:Non \l_@@_values_prop \l_@@_key_name_tl {#1}
}
}
\cs_new_protected:Npn \@@_store_value_muskip:n #1
{
\@@_if_eval_now:nTF {#1}
{
\muskip_set:Nn \l_@@_tmp_muskip {#1}
\prop_put:NVV \l_@@_values_prop \l_@@_key_name_tl
\l_@@_tmp_muskip
}
{
\prop_put:Non \l_@@_values_prop \l_@@_key_name_tl {#1}
}
}
\cs_new_protected:Npn \@@_store_value_skip:n #1
{
\@@_if_eval_now:nTF {#1}
{
\skip_set:Nn \l_@@_tmp_skip {#1}
\prop_put:NVV \l_@@_values_prop \l_@@_key_name_tl
\l_@@_tmp_skip
}
{
\prop_put:Non \l_@@_values_prop \l_@@_key_name_tl {#1}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Implementation part of template declaration}
%
% \begin{macro}{\@@_declare_template_code:nnnnn}
% The main function for implementing a template starts with a couple of
% simple checks to make sure that there are no obvious mistakes: the
% number of arguments must agree and the template keys must have been
% declared.
% \begin{macrocode}
\cs_new_protected:Npn \@@_declare_template_code:nnnnn #1#2#3#4#5
{
\@@_execute_if_type_exist:nT {#1}
{
\@@_execute_if_arg_agree:nnT {#1}{#3}
{
\@@_if_keys_exist:nnT {#1} {#2}
{
\@@_store_key_implementation:nnn {#1} {#2} {#4}
\cs_generate_from_arg_count:cNnn
{ \c_@@_code_root_tl #1 / #2 }
\cs_gset_protected:Npn {#3} {#5}
}
}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_store_key_implementation:nnn}
% Actually storing the implementation part of a template is quite easy
% as it only requires the list of keys given to be turned into a
% property list. There is also some error-checking to do, hence the need
% to have the list of defined keytypes available. In certain cases
% (when choices are involved) parsing the key results in changes to the
% default values. That is why they are loaded and then saved again.
% \begin{macrocode}
\cs_new_protected:Npn \@@_store_key_implementation:nnn #1#2#3
{
\@@_recover_defaults:n { #1 / #2 }
\@@_recover_keytypes:n { #1 / #2 }
\prop_clear:N \l_@@_vars_prop
\keyval_parse:NNn
\@@_parse_vars_elt:n \@@_parse_vars_elt:nn {#3}
\@@_store_vars:n { #1 / #2 }
\clist_clear:N \l_@@_restrict_clist
\@@_store_restrictions:n { #1 / #2 }
\prop_map_inline:Nn \l_@@_keytypes_prop
{
\msg_error:nnxxx { xtemplate } { key-not-implemented }
{##1} {#2} {#1}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_parse_vars_elt:n}
% At the implementation stage, every key must have a value given. So
% this is an error function.
% \begin{macrocode}
\cs_new_protected:Npn \@@_parse_vars_elt:n #1
{ \msg_error:nnx { xtemplate } { key-no-variable } {#1} }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_parse_vars_elt:nn}
% The actual storage part here is very simple: the storage bin name
% is placed into the property list. At the same time, a comparison is
% made with the keytypes defined earlier: if there is a mismatch then
% an error is raised.
% \begin{macrocode}
\cs_new_protected:Npn \@@_parse_vars_elt:nn #1#2
{
\tl_set:Nx \l_@@_key_name_tl { \tl_to_str:n {#1} }
\tl_remove_all:Nn \l_@@_key_name_tl { ~ }
\prop_get:NoNTF
\l_@@_keytypes_prop
\l_@@_key_name_tl
\l_@@_keytype_tl
{
\@@_split_keytype_arg:o \l_@@_keytype_tl
\@@_parse_vars_elt_aux:n {#2}
\prop_remove:NV \l_@@_keytypes_prop \l_@@_key_name_tl
}
{ \msg_error:nnx { xtemplate } { unknown-key } {#1} }
}
% \end{macrocode}
% \end{macro}
% \begin{macro}{\@@_parse_vars_elt_aux:n}
% \begin{macro}{\@@_parse_vars_elt_aux:w}
% There now needs to be some sanity checking on the variable name
% given. This does not apply for \texttt{choice} or
% \texttt{code} \enquote{variables}, but in all other cases the variable
% needs to exist. Also, the only prefix acceptable is \texttt{global}. So
% there are a few related checks to make.
% \begin{macrocode}
\cs_new_protected:Npn \@@_parse_vars_elt_aux:n #1
{
\str_if_eq:onTF \l_@@_keytype_tl { choice }
{ \@@_implement_choices:n {#1} }
{
\str_if_eq:onTF \l_@@_keytype_tl { code }
{
\prop_put:Non \l_@@_vars_prop
\l_@@_key_name_tl {#1}
}
{
\tl_if_single:nTF {#1}
{
\cs_if_exist:NF #1
{ \@@_create_variable:N #1 }
\prop_put:Non \l_@@_vars_prop
\l_@@_key_name_tl {#1}
}
{
\tl_if_in:nnTF {#1} { global }
{ \@@_parse_vars_elt_aux:w #1 \q_stop }
{
\msg_error:nnx { xtemplate } { bad-variable }
{ \tl_to_str:n {#1} }
}
}
}
}
}
\cs_new_protected:Npn \@@_parse_vars_elt_aux:w #1 global #2 \q_stop
{
\tl_if_empty:nTF {#1}
{
\tl_if_single:nTF {#2}
{
\cs_if_exist:NF #2
{ \@@_create_variable:N #2 }
\prop_put:Non \l_@@_vars_prop
\l_@@_key_name_tl { #1 global #2 }
}
{
\msg_error:nnx { xtemplate } { bad-variable }
{ \tl_to_str:n { #1 global #2 } }
}
}
{
\msg_error:nnx { xtemplate } { bad-variable }
{ \tl_to_str:n { #1 global #2 } }
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_create_variable:N}
% A shortcut to create non-declared variables. Some types need a name
% mapping, others can be used directly.
% \begin{macrocode}
\cs_new_protected:Npn \@@_create_variable:N #1
{
\str_case:onF \l_@@_keytype_tl
{
{ boolean } { \bool_new:N #1 }
{ commalist } { \clist_new:N #1 }
{ function } { \cs_new:Npn #1 { } }
{ instance } { \cs_new_protected:Npn #1 { } }
{ integer } { \int_new:N #1 }
{ length } { \dim_new:N #1 }
{ real } { \fp_new:N #1 }
{ tokenlist } { \tl_new:N #1 }
}
{ \use:c { \l_@@_keytype_tl _ new:N } #1 }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_implement_choices:n}
% \begin{macro}{\@@_implement_choices_default:}
% Implementing choices requires a second key--value loop. So after a
% little set-up, the standard parser is called.
% \begin{macrocode}
\cs_new_protected:Npn \@@_implement_choices:n #1
{
\clist_set_eq:NN \l_@@_tmp_clist \l_@@_keytype_arg_tl
\prop_put:Non \l_@@_vars_prop \l_@@_key_name_tl { }
\keyval_parse:NNn
\@@_implement_choice_elt:n \@@_implement_choice_elt:nn
{#1}
\prop_get:NoNT \l_@@_values_prop \l_@@_key_name_tl
\l_@@_tmp_tl
{ \@@_implement_choices_default: }
\clist_if_empty:NF \l_@@_tmp_clist
{
\clist_map_inline:Nn \l_@@_tmp_clist
{
\msg_error:nnx { xtemplate } { choice-not-implemented }
{##1}
}
}
}
% \end{macrocode}
% A sanity check for the default value, so that an error is raised
% now and not when converting to assignments.
% \begin{macrocode}
\cs_new_protected:Npn \@@_implement_choices_default:
{
\tl_set:Nx \l_@@_tmp_tl
{ \l_@@_key_name_tl \c_space_tl \l_@@_tmp_tl }
\prop_if_in:NoF \l_@@_vars_prop \l_@@_tmp_tl
{
\tl_set:Nx \l_@@_tmp_tl
{ \l_@@_key_name_tl \c_space_tl \l_@@_tmp_tl }
\prop_if_in:NoF \l_@@_vars_prop \l_@@_tmp_tl
{
\prop_get:NoN \l_@@_keytypes_prop \l_@@_key_name_tl
\l_@@_tmp_tl
\@@_split_keytype_arg:o \l_@@_tmp_tl
\prop_get:NoN \l_@@_values_prop \l_@@_key_name_tl
\l_@@_tmp_tl
\msg_error:nnxxx { xtemplate } { unknown-default-choice }
{ \l_@@_key_name_tl } { \l_@@_key_name_tl }
{ \l_@@_keytype_arg_tl }
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_implement_choice_elt:n}
% \begin{macro}{\@@_implement_choice_elt:nn}
% The actual storage of the implementation of a choice is mainly about
% error checking. The code here ensures that all choices have to have
% been declared, apart from the special \texttt{unknown} choice, which
% must come last. The code for each choice is stored along with the
% key name in the variables property list.
% \begin{macrocode}
\cs_new_protected:Npn \@@_implement_choice_elt:n #1
{
\clist_if_empty:NTF \l_@@_tmp_clist
{
\str_if_eq:nnF {#1} { unknown }
{
\prop_get:NoN \l_@@_keytypes_prop \l_@@_key_name_tl
\l_@@_tmp_tl
\@@_split_keytype_arg:o \l_@@_tmp_tl
\msg_error:nnxxx { xtemplate } { unknown-choice }
{ \l_@@_key_name_tl } {#1}
{ \l_@@_keytype_arg_tl }
}
}
{
\clist_if_in:NnTF \l_@@_tmp_clist {#1}
{ \clist_remove_all:Nn \l_@@_tmp_clist {#1} }
{
\prop_get:NoN \l_@@_keytypes_prop \l_@@_key_name_tl
\l_@@_tmp_tl
\@@_split_keytype_arg:o \l_@@_tmp_tl
\msg_error:nnxxx { xtemplate } { unknown-choice }
{ \l_@@_key_name_tl } {#1}
{ \l_@@_keytype_arg_tl }
}
}
}
\cs_new_protected:Npn \@@_implement_choice_elt:nn #1#2
{
\@@_implement_choice_elt:n {#1}
\tl_set:Nx \l_@@_tmp_tl
{ \l_@@_key_name_tl \c_space_tl #1 }
\prop_put:Non \l_@@_vars_prop \l_@@_tmp_tl {#2}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Editing template defaults}
%
% Template defaults can be edited either with no other changes or
% to prevent further editing, forming a \enquote{restricted template}.
% In the later case, a new template results, whereas simple editing
% does not produce a new template name.
%
% \begin{macro}{\@@_declare_restricted:nnnn}
% Creating a restricted template means copying the old template to the
% new one first.
% \begin{macrocode}
\cs_new_protected:Npn \@@_declare_restricted:nnnn #1#2#3#4
{
\@@_if_keys_exist:nnT {#1} {#2}
{
\@@_set_template_eq:nn { #1 / #3 } { #1 / #2 }
\bool_set_true:N \l_@@_restrict_bool
\@@_edit_defaults_aux:nnn {#1} {#3} {#4}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_edit_defaults:nnn}
% \begin{macro}{\@@_edit_defaults_aux:nnn}
% Editing the template defaults means getting the values back out
% of the store, then parsing the list of new values before putting
% the updated list back into storage. The auxiliary function is used
% to allow code-sharing with the template-restriction system.
% \begin{macrocode}
\cs_new_protected:Npn \@@_edit_defaults:nnn
{
\bool_set_false:N \l_@@_restrict_bool
\@@_edit_defaults_aux:nnn
}
\cs_new_protected:Npn \@@_edit_defaults_aux:nnn #1#2#3
{
\@@_if_keys_exist:nnT {#1} {#2}
{
\@@_recover_defaults:n { #1 / #2 }
\@@_recover_restrictions:n { #1 / #2 }
\@@_parse_values:nn { #1 / #2 } {#3}
\@@_store_defaults:n { #1 / #2 }
\@@_store_restrictions:n { #1 / #2 }
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_parse_values:nn}
% The routine to parse values is the same for both editing a
% template and setting up an instance. So the code here does only the
% minimum necessary for reading the values.
% \begin{macrocode}
\cs_new_protected:Npn \@@_parse_values:nn #1#2
{
\@@_recover_keytypes:n {#1}
\clist_clear:N \l_@@_restrict_clist
\keyval_parse:NNn
\@@_parse_values_elt:n \@@_parse_values_elt:nn {#2}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_parse_values_elt:n}
% Every key needs a value, so this is just an error routine.
% \begin{macrocode}
\cs_new_protected:Npn \@@_parse_values_elt:n #1
{
\bool_set_true:N \l_@@_error_bool
\msg_error:nnx { xtemplate } { key-no-value } {#1}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_parse_values_elt:nn}
% \begin{macro}{\@@_parse_values_elt_aux:n}
% To store the value, find the keytype then call the saving function.
% These need the current key name saved as \cs{l_@@_key_name_tl}.
% When a template is being restricted, the setting code will be
% skipped for restricted keys.
% \begin{macrocode}
\cs_new_protected:Npn \@@_parse_values_elt:nn #1#2
{
\tl_set:Nx \l_@@_key_name_tl { \tl_to_str:n {#1} }
\tl_remove_all:Nn \l_@@_key_name_tl { ~ }
\prop_get:NoNTF \l_@@_keytypes_prop \l_@@_key_name_tl
\l_@@_tmp_tl
{
\bool_if:NTF \l_@@_restrict_bool
{
\clist_if_in:NoF \l_@@_restrict_clist
\l_@@_key_name_tl
{ \@@_parse_values_elt_aux:n {#2} }
}
{ \@@_parse_values_elt_aux:n {#2} }
}
{
\msg_error:nnx { xtemplate } { unknown-key }
{ \l_@@_key_name_tl }
}
}
\cs_new_protected:Npn \@@_parse_values_elt_aux:n #1
{
\clist_put_right:No \l_@@_restrict_clist \l_@@_key_name_tl
\@@_split_keytype_arg:o \l_@@_tmp_tl
\use:c { @@_store_value_ \l_@@_keytype_tl :n } {#1}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_set_template_eq:nn}
% To copy a template, each of the lists plus the code has to be copied
% across. To keep this independent of the list storage system, it is
% all done with two-part shuffles.
% \begin{macrocode}
\cs_new_protected:Npn \@@_set_template_eq:nn #1#2
{
\@@_recover_defaults:n {#2}
\@@_store_defaults:n {#1}
\@@_recover_keytypes:n {#2}
\@@_store_keytypes:n {#1}
\@@_recover_vars:n {#2}
\@@_store_vars:n {#1}
\cs_gset_eq:cc { \c_@@_code_root_tl #1 }
{ \c_@@_code_root_tl #2 }
}
% \end{macrocode}
% \end{macro}
%
%\subsection{Creating instances of templates}
%
% \begin{macro}{\@@_declare_instance:nnnnn}
% \begin{macro}{\@@_declare_instance_aux:nnnnn}
% Making an instance has two distinct parts. First, the keys given are
% parsed to transfer the values into the structured data format used
% internally. This allows the default and given values to be combined
% with no repetition. In the second step, the structured data is
% converted to pre-defined variable assignments, and these are stored
% in the function for the instance. A final check is also made so that
% there is always an instance \enquote{outside} of any collection.
% \begin{macrocode}
\cs_new_protected:Npn \@@_declare_instance:nnnnn #1#2#3#4#5
{
\@@_execute_if_code_exist:nnT {#1} {#2}
{
\@@_recover_defaults:n { #1 / #2 }
\@@_recover_vars:n { #1 / #2 }
\@@_declare_instance_aux:nnnnn {#1} {#2} {#3} {#4} {#5}
}
}
\cs_new_protected:Npn \@@_declare_instance_aux:nnnnn #1#2#3#4#5
{
\bool_set_false:N \l_@@_error_bool
\@@_parse_values:nn { #1 / #2 } {#5}
\bool_if:NF \l_@@_error_bool
{
\prop_put:Nnn \l_@@_values_prop { from~template } {#2}
\@@_store_values:n { #1 / #3 / #4 }
\@@_convert_to_assignments:
\cs_set_protected:cpx { \c_@@_instances_root_tl #1 / #3 / #4 }
{
\exp_not:N \@@_assignments_push:n
{ \exp_not:o \l_@@_assignments_tl }
\exp_not:c { \c_@@_code_root_tl #1 / #2 }
}
\@@_if_instance_exist:nnnF {#1} { } {#4}
{
\cs_set_eq:cc
{ \c_@@_instances_root_tl #1 / / #4 }
{ \c_@@_instances_root_tl #1 / #3 / #4 }
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_edit_instance:nnnn}
% \begin{macro}{\@@_edit_instance_aux:nnnnn}
% \begin{macro}{\@@_edit_instance_aux:nonnn}
% Editing an instance is almost identical to declaring one. The only
% variation is the source of the values to use. When editing, they are
% recovered from the previous instance run.
% \begin{macrocode}
\cs_new_protected:Npn \@@_edit_instance:nnnn #1#2#3
{
\@@_if_instance_exist:nnnTF {#1} {#2} {#3}
{
\@@_recover_values:n { #1 / #2 / #3 }
\prop_get:NnN \l_@@_values_prop { from~template }
\l_@@_tmp_tl
\@@_edit_instance_aux:nonnn {#1} \l_@@_tmp_tl
{#2} {#3}
}
{
\msg_error:nnxx { xtemplate } { unknown-instance }
{#1} {#3}
}
}
\cs_new_protected:Npn \@@_edit_instance_aux:nnnnn #1#2
{
\@@_recover_vars:n { #1 / #2 }
\@@_declare_instance_aux:nnnnn {#1} {#2}
}
\cs_generate_variant:Nn \@@_edit_instance_aux:nnnnn { no }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_convert_to_assignments:}
% \begin{macro}{\@@_convert_to_assignments_aux:n}
% \begin{macro}{\@@_convert_to_assignments_aux:nn}
% \begin{macro}{\@@_convert_to_assignments_aux:no}
% The idea on converting to a set of assignments is to loop over each
% key, so that the loop order follows the declaration order of the keys.
% This is done using a sequence as property lists are not
% \enquote{ordered}.
% \begin{macrocode}
\cs_new_protected:Npn \@@_convert_to_assignments:
{
\tl_clear:N \l_@@_assignments_tl
\seq_map_function:NN \l_@@_key_order_seq
\@@_convert_to_assignments_aux:n
}
\cs_new_protected:Npn \@@_convert_to_assignments_aux:n #1
{
\prop_get:NnN \l_@@_keytypes_prop {#1} \l_@@_tmp_tl
\@@_convert_to_assignments_aux:no {#1} \l_@@_tmp_tl
}
% \end{macrocode}
% The second auxiliary function actually does the work. The
% arguments here are the key name (|#1|) and the keytype (|#2|).
% From those, the value to assign and the name of the appropriate
% variable are recovered. A bit of work is then needed to sort out
% keytypes with arguments (for example instances), and to look for
% global assignments. Once that is done, a hand-off can be made to the
% handler for the relevant keytype.
% \begin{macrocode}
\cs_new_protected:Npn \@@_convert_to_assignments_aux:nn #1#2
{
\prop_get:NnNT \l_@@_values_prop {#1} \l_@@_value_tl
{
\prop_get:NnNTF \l_@@_vars_prop {#1} \l_@@_var_tl
{
\@@_split_keytype_arg:n {#2}
\str_if_eq:onF \l_@@_keytype_tl { choice }
{
\str_if_eq:onF \l_@@_keytype_tl { code }
{ \@@_find_global: }
}
\tl_set:Nn \l_@@_key_name_tl {#1}
\use:c { @@_assign_ \l_@@_keytype_tl : }
}
{ \msg_error:nnx { xtemplate } { unknown-attribute } {#1} }
}
}
\cs_generate_variant:Nn \@@_convert_to_assignments_aux:nn { no }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_find_global:}
% \begin{macro}{\@@_find_global_aux:w}
% Global assignments should have the phrase |global| at the front.
% This is pretty easy to find: no other error checking, though.
% \begin{macrocode}
\cs_new_protected:Npn \@@_find_global:
{
\bool_set_false:N \l_@@_global_bool
\tl_if_in:onT \l_@@_var_tl { global }
{
\exp_after:wN \@@_find_global_aux:w \l_@@_var_tl \q_stop
}
}
\cs_new_protected:Npn \@@_find_global_aux:w #1 global #2 \q_stop
{
\tl_set:Nn \l_@@_var_tl {#2}
\bool_set_true:N \l_@@_global_bool
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Using templates directly}
%
% \begin{macro}{\@@_use_template:nnn}
% Directly use a template with a particular parameter setting.
% This is also picked up if used in a nested fashion inside a parameter
% list. The idea is essentially the same as creating an instance,
% just with no saving of the result.
% \begin{macrocode}
\cs_new_protected:Npn \@@_use_template:nnn #1#2#3
{
\@@_execute_if_code_exist:nnT {#1} {#2}
{
\@@_recover_defaults:n { #1 / #2 }
\@@_recover_vars:n { #1 / #2 }
\@@_parse_values:nn { #1 / #2 } {#3}
\@@_convert_to_assignments:
\use:c { \c_@@_code_root_tl #1 / #2 }
}
}
% \end{macrocode}
% \end{macro}
%
% \subsection{Assigning values to variables}
%
% \begin{macro}{\@@_assign_boolean:}
% \begin{macro}{\@@_assign_boolean_aux:n}
% Setting a Boolean value is slightly different to everything else
% as the value can be used to work out which \texttt{set} function to
% call. As long as there is no need to recover things from another
% variable, everything is pretty easy. If there is, then we need to allow
% for the fact that the recovered value here will \emph{not} be expandable,
% so needs to be converted to something that is.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assign_boolean:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_boolean_aux:n { bool_gset } }
{ \@@_assign_boolean_aux:n { bool_set } }
}
\cs_new_protected:Npn \@@_assign_boolean_aux:n #1
{
\@@_if_key_value:oTF \l_@@_value_tl
{
\@@_key_to_value:
\tl_put_right:Nx \l_@@_assignments_tl
{
\exp_not:c { #1 _eq:NN }
\exp_not:o \l_@@_var_tl
\exp_not:o \l_@@_value_tl
}
}
{
\tl_put_right:Nx \l_@@_assignments_tl
{
\exp_not:c { #1 _ \l_@@_value_tl :N }
\exp_not:o \l_@@_var_tl
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_assign_choice:}
% \begin{macro}
% {\@@_assign_choice_aux:n, \@@_assign_choice_aux:o}
% The idea here is to find either the choice as-given or else the
% special |unknown| choice, and to copy the appropriate code across.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assign_choice:
{
\@@_assign_choice_aux:xF
{ \l_@@_key_name_tl \c_space_tl \l_@@_value_tl }
{
\@@_assign_choice_aux:xF
{ \l_@@_key_name_tl \c_space_tl unknown }
{
\prop_get:NoN \l_@@_keytypes_prop \l_@@_key_name_tl
\l_@@_tmp_tl
\@@_split_keytype_arg:o \l_@@_tmp_tl
\msg_error:nnxxx { xtemplate } { unknown-choice }
{ \l_@@_key_name_tl } { \l_@@_value_tl }
{ \l_@@_keytype_arg_tl }
}
}
}
\cs_new_protected:Npn \@@_assign_choice_aux:nF #1
{
\prop_get:NnNTF
\l_@@_vars_prop
{#1}
\l_@@_tmp_tl
{ \tl_put_right:No \l_@@_assignments_tl \l_@@_tmp_tl }
}
\cs_generate_variant:Nn \@@_assign_choice_aux:nF { x }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_assign_code:}
% \begin{macro}{\@@_assign_code:n}
% Assigning general code to a key needs a scratch function to be created
% and run when \cs{AssignTemplateKeys} is called. So the appropriate
% definition then use is created in the token list variable.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assign_code:
{
\tl_put_right:Nx \l_@@_assignments_tl
{
\cs_set_protected:Npn \@@_assign_code:n \exp_not:n {##1}
{ \exp_not:o \l_@@_var_tl }
\@@_assign_code:n { \exp_not:o \l_@@_value_tl }
}
}
\cs_new_protected:Npn \@@_assign_code:n #1 { }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_assign_function:}
% \begin{macro}{\@@_assign_function_aux:N}
% This looks a bit messy but is only actually one function.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assign_function:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_function_aux:N \cs_gset:Npn }
{ \@@_assign_function_aux:N \cs_set:Npn }
}
\cs_new_protected:Npn \@@_assign_function_aux:N #1
{
\tl_put_right:Nx \l_@@_assignments_tl
{
\cs_generate_from_arg_count:NNnn
\exp_not:o \l_@@_var_tl
\exp_not:N #1
{ \exp_not:o \l_@@_keytype_arg_tl }
{ \exp_not:o \l_@@_value_tl }
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_assign_instance:}
% \begin{macro}{\@@_assign_instance_aux:N}
% Using an instance means adding the appropriate function creation to
% the tl. No checks are made at this stage, so if the instance is
% not valid then errors will arise later.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assign_instance:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_instance_aux:N \cs_gset_protected:Npn }
{ \@@_assign_instance_aux:N \cs_set_protected:Npn }
}
\cs_new_protected:Npn \@@_assign_instance_aux:N #1
{
\tl_put_right:Nx \l_@@_assignments_tl
{
\exp_not:N #1 \exp_not:o \l_@@_var_tl
{
\@@_use_instance:nn
{ \exp_not:o \l_@@_keytype_arg_tl }
{ \exp_not:o \l_@@_value_tl }
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_assign_integer:}
% \begin{macro}{\@@_assign_length:}
% \begin{macro}{\@@_assign_muskip:}
% \begin{macro}{\@@_assign_real:}
% \begin{macro}{\@@_assign_skip:}
% All of the calculated assignments use the same underlying code, with
% only the low-level assignment function changing.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assign_integer:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_variable:N \int_gset:Nn }
{ \@@_assign_variable:N \int_set:Nn }
}
\cs_new_protected:Npn \@@_assign_length:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_variable:N \dim_gset:Nn }
{ \@@_assign_variable:N \dim_set:Nn }
}
\cs_new_protected:Npn \@@_assign_muskip:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_variable:N \muskip_gset:Nn }
{ \@@_assign_variable:N \muskip_set:Nn }
}
\cs_new_protected:Npn \@@_assign_real:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_variable:N \fp_gset:Nn }
{ \@@_assign_variable:N \fp_set:Nn }
}
\cs_new_protected:Npn \@@_assign_skip:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_variable:N \skip_gset:Nn }
{ \@@_assign_variable:N \skip_set:Nn }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_assign_tokenlist:}
% \begin{macro}{\@@_assign_tokenlist_aux:NN}
% Life would be easy here if it were not for \cs{KeyValue}. To deal
% correctly with that, we need to allow for the recovery a a stored value
% at point of use.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assign_tokenlist:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_tokenlist_aux:NN \tl_gset:NV \tl_gset:Nn }
{ \@@_assign_tokenlist_aux:NN \tl_set:NV \tl_set:Nn }
}
\cs_new_protected:Npn \@@_assign_tokenlist_aux:NN #1#2
{
\@@_if_key_value:oTF \l_@@_value_tl
{
\@@_key_to_value:
\tl_put_right:Nx \l_@@_assignments_tl
{
#1 \exp_not:o \l_@@_var_tl
\exp_not:o \l_@@_value_tl
}
}
{
\tl_put_right:Nx \l_@@_assignments_tl
{
#2 \exp_not:o \l_@@_var_tl
{ \exp_not:o \l_@@_value_tl }
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_assign_commalist:}
% Very similar for commas lists, so some code is shared.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assign_commalist:
{
\bool_if:NTF \l_@@_global_bool
{ \@@_assign_tokenlist_aux:NN \clist_gset:NV \clist_gset:Nn }
{ \@@_assign_tokenlist_aux:NN \clist_set:NV \clist_set:Nn }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_assign_variable:N}
% A general-purpose function for all of the numerical assignments.
% As long as the value is not coming from another variable, the stored
% value is simply transferred for output.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assign_variable:N #1
{
\@@_if_key_value:oT \l_@@_value_tl
{ \@@_key_to_value: }
\tl_put_right:Nx \l_@@_assignments_tl
{
#1 \exp_not:o \l_@@_var_tl
{ \exp_not:o \l_@@_value_tl }
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_key_to_value:}
% \begin{macro}{\@@_key_to_value_auxi:w}
% \begin{macro}{\@@_key_to_value_auxii:w}
% The idea here is to recover the attribute value of another key. To
% do that, the marker is removed and a look up takes place. If this
% is successful, then the name of the variable of the attribute is
% returned. This assumes that the value will be used in context where
% it will be converted to a value, for example when setting a number.
% There is also a need to check in case the copied value happens to be
% \texttt{global}.
% \begin{macrocode}
\cs_new_protected:Npn \@@_key_to_value:
{ \exp_after:wN \@@_key_to_value_auxi:w \l_@@_value_tl }
\cs_new_protected:Npn \@@_key_to_value_auxi:w \KeyValue #1
{
\tl_set:Nx \l_@@_tmp_tl { \tl_to_str:n {#1} }
\tl_remove_all:Nn \l_@@_key_name_tl { ~ }
\prop_get:NoNTF
\l_@@_vars_prop
\l_@@_tmp_tl
\l_@@_value_tl
{
\exp_after:wN \@@_key_to_value_auxii:w \l_@@_value_tl
\q_mark global \q_nil \q_stop
}
{
\msg_error:nnx { xtemplate } { unknown-attribute }
{ \l_@@_tmp_tl }
}
}
\cs_new_protected:Npn \@@_key_to_value_auxii:w #1 global #2#3 \q_stop
{
\quark_if_nil:NF #2
{ \tl_set:Nn \l_@@_value_tl {#2} }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Using instances}
%
% \begin{macro}{\@@_use_instance:nn}
% \begin{macro}{\@@_use_instance_aux:nNnnn}
% \begin{macro}{\@@_use_instance_aux:nn}
% Using an instance is just a question of finding the appropriate
% function. There is the possibility that a collection instance exists,
% so this is checked before trying the general instance. If nothing is
% found, an error is raised. One additional complication is that
% if the first token of argument |#2| is \cs{UseTemplate} then that
% is also valid. There is an error-test to make sure that the
% types agree, and if so the template is used directly.
% \begin{macrocode}
\cs_new_protected:Npn \@@_use_instance:nn #1#2
{
\@@_if_use_template:nTF {#2}
{ \@@_use_instance_aux:nNnnn {#1} #2 }
{ \@@_use_instance_aux:nn {#1} {#2} }
}
\cs_new_protected:Npn \@@_use_instance_aux:nNnnn #1#2#3#4#5
{
\str_if_eq:nnTF {#1} {#3}
{ \@@_use_template:nnn {#3} {#4} {#5} }
{ \msg_error:nnxx { xtemplate } { type-mismatch } {#1} {#3} }
}
\cs_new_protected:Npn \@@_use_instance_aux:nn #1#2
{
\@@_get_collection:n {#1}
\@@_if_instance_exist:nnnTF
{#1} { \l_@@_collection_tl } {#2}
{
\use:c
{
\c_@@_instances_root_tl #1 /
\l_@@_collection_tl / #2
}
}
{
\@@_if_instance_exist:nnnTF {#1} { } {#2}
{ \use:c { \c_@@_instances_root_tl #1 / / #2 } }
{
\msg_error:nnxx { xtemplate } { unknown-instance }
{#1} {#2}
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_use_collection:nn}
% Switching to an instance collection is just a question of setting the
% appropriate list.
% \begin{macrocode}
\cs_new_protected:Npn \@@_use_collection:nn #1#2
{ \prop_put:Nnn \l_@@_collections_prop {#1} {#2} }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_get_collection:n}
% Recovering the collection for a given type is pretty easy: just a read
% from the list.
% \begin{macrocode}
\cs_new_protected:Npn \@@_get_collection:n #1
{
\prop_get:NnNF \l_@@_collections_prop {#1}
\l_@@_collection_tl
{ \tl_clear:N \l_@@_collection_tl }
}
% \end{macrocode}
% \end{macro}
%
%\subsection{Assignment manipulation}
%
% A few functions to transfer assignments about, as this is needed by
% \cs{AssignTemplateKeys}.
%
% \begin{macro}{\@@_assignments_pop:}
% To actually use the assignments.
% \begin{macrocode}
\cs_new:Npn \@@_assignments_pop: { \l_@@_assignments_tl }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_assignments_push:n}
% Here, the assignments are stored for later use.
% \begin{macrocode}
\cs_new_protected:Npn \@@_assignments_push:n #1
{ \tl_set:Nn \l_@@_assignments_tl {#1} }
% \end{macrocode}
% \end{macro}
%
% \subsection{Showing templates and instances}
%
% \begin{macro}{\@@_show_code:nn}
% Showing the code for a template is just a translation of
% \cs{cs_show:c}.
% \begin{macrocode}
\cs_new_protected:Npn \@@_show_code:nn #1#2
{ \cs_show:c { \c_@@_code_root_tl #1 / #2 } }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}
% {
% \@@_show_defaults:nn, \@@_show_keytypes:nn,
% \@@_show_vars:nn
% }
% \begin{macro}{\@@_show:Nnnn}
% A modified version of the property-list printing code, such that
% the output refers to templates and instances rather than to the
% underlying structures.
% \begin{macrocode}
\cs_new_protected:Npn \@@_show_defaults:nn #1#2
{
\@@_if_keys_exist:nnT {#1} {#2}
{
\@@_recover_defaults:n { #1 / #2 }
\@@_show:Nnnn \l_@@_values_prop
{#1} {#2} { default~values }
}
}
\cs_new_protected:Npn \@@_show_keytypes:nn #1#2
{
\@@_if_keys_exist:nnT {#1} {#2}
{
\@@_recover_keytypes:n { #1 / #2 }
\@@_show:Nnnn \l_@@_keytypes_prop
{#1} {#2} { interface }
}
}
\cs_new_protected:Npn \@@_show_vars:nn #1#2
{
\@@_execute_if_code_exist:nnT {#1} {#2}
{
\@@_recover_vars:n { #1 / #2 }
\@@_show:Nnnn \l_@@_vars_prop
{#1} {#2} { variable~mapping }
}
}
\cs_new_protected:Npn \@@_show:Nnnn #1#2#3#4
{
\msg_show:nnxxxx { xtemplate } { show-attribute }
{ \tl_to_str:n {#2} }
{ \tl_to_str:n {#3} }
{ \tl_to_str:n {#4} }
{ \prop_map_function:NN #1 \msg_show_item_unbraced:nn }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_show_values:nnn}
% Instance values are a little more complex, as there are the collection
% and template to consider.
% \begin{macrocode}
\cs_new_protected:Npn \@@_show_values:nnn #1#2#3
{
\@@_if_instance_exist:nnnT {#1} {#2} {#3}
{
\@@_recover_values:n { #1 / #2 / #3 }
\msg_show:nnxxxx { xtemplate } { show-values }
{ \tl_to_str:n {#1} }
{ \tl_to_str:n {#2} }
{ \tl_to_str:n {#3} }
{
\prop_map_function:NN \l_@@_values_prop
\msg_show_item_unbraced:nn
}
}
}
% \end{macrocode}
% \end{macro}
%
% \subsection{Messages}
%
% The text for error messages: short and long text for all of them.
% \begin{macrocode}
\msg_new:nnnn { xtemplate } { argument-number-mismatch }
{ Object~type~'#1'~takes~#2~argument(s). }
{
Objects~of~type~'#1'~require~#2~argument(s).\\
You~have~tried~to~make~a~template~for~'#1'~
with~#3~argument(s),~which~is~not~possible:~
the~number~of~arguments~must~agree.
}
\msg_new:nnnn { xtemplate } { bad-number-of-arguments }
{ Bad~number~of~arguments~for~object~type~'#1'. }
{
An~object~may~accept~between~0~and~9~arguments.\\
You~asked~to~use~#2~arguments:~this~is~not~supported.
}
\msg_new:nnnn { xtemplate } { bad-variable }
{ Incorrect~variable~description~'#1'. }
{
The~argument~'#1'~is~not~of~the~form \\
~~'<variable>'\\
~or~\\
~~'global~<variable>'.\\
It~must~be~given~in~one~of~these~formats~to~be~used~in~a~template.
}
\msg_new:nnnn { xtemplate } { choice-not-implemented }
{ The~choice~'#1'~has~no~implementation. }
{
Each~choice~listed~in~the~interface~for~a~template~must~
have~an~implementation.
}
\msg_new:nnnn { xtemplate } { choice-no-code }
{ The~choice~'#1'~requires~implementation~details. }
{
When~creating~template~code~using~\DeclareTemplateCode,~
each~choice~name~must~have~an~associated~implementation.\\
This~should~be~given~after~a~'='~sign:~LaTeX~did~not~find~one.
}
\msg_new:nnnn { xtemplate } { duplicate-key-interface }
{ Key~'#1'~appears~twice~in~interface~definition~\msg_line_context:. }
{
Each~key~can~only~have~one~interface~declared~in~a~template.\\
LaTeX~found~two~interfaces~for~'#1'.
}
\msg_new:nnnn { xtemplate } { keytype-requires-argument }
{ The~key~type~'#1'~requires~an~argument~\msg_line_context:. }
{
You~should~have~put:\\
\ \ <key-name>~:~#1~{~<argument>~} \\
but~LaTeX~did~not~find~an~<argument>.
}
\msg_new:nnnn { xtemplate } { invalid-keytype }
{ The~key~'#1'~is~missing~a~key-type~\msg_line_context:. }
{
Each~key~in~a~template~requires~a~key-type,~given~in~the~form:\\
\ \ <key>~:~<key-type>\\
LaTeX~could~not~find~a~<key-type>~in~your~input.
}
\msg_new:nnnn { xtemplate } { key-no-value }
{ The~key~'#1'~has~no~value~\msg_line_context:. }
{
When~creating~an~instance~of~a~template~
every~key~listed~must~include~a~value:\\
\ \ <key>~=~<value>
}
\msg_new:nnnn { xtemplate } { key-no-variable }
{ The~key~'#1'~requires~implementation~details~\msg_line_context:. }
{
When~creating~template~code~using~\DeclareTemplateCode,~
each~key~name~must~have~an~associated~implementation.\\
This~should~be~given~after~a~'='~sign:~LaTeX~did~not~find~one.
}
\msg_new:nnnn { xtemplate } { key-not-implemented }
{ Key~'#1'~has~no~implementation~\msg_line_context:. }
{
The~definition~of~key~implementations~for~template~'#2'~
of~object~type~'#3'~does~not~include~any~details~for~key~'#1'.\\
The~key~was~declared~in~the~interface~definition,~
and~so~an~implementation~is~required.
}
\msg_new:nnnn { xtemplate } { missing-keytype }
{ The~key~'#1'~is~missing~a~key-type~\msg_line_context:. }
{
Key~interface~definitions~should~be~of~the~form\\
\ \ #1~:~<key-type>\\
but~LaTeX~could~not~find~a~<key-type>.
}
\msg_new:nnnn { xtemplate } { no-template-code }
{
The~template~'#2'~of~type~'#1'~is~unknown~
or~has~no~implementation.
}
{
There~is~no~code~available~for~the~template~name~given.\\
This~should~be~given~using~\DeclareTemplateCode.
}
\msg_new:nnnn { xtemplate } { object-type-mismatch }
{ Object~types~'#1'~and~'#2'~do~not~agree. }
{
You~are~trying~to~use~a~template~directly~with~\UseInstance
(or~a~similar~function),~but~the~object~types~do~not~match.
}
\msg_new:nnnn { xtemplate } { unknown-attribute }
{ The~template~attribute~'#1'~is~unknown. }
{
There~is~a~definition~in~the~current~template~reading\\
\ \ \token_to_str:N \KeyValue {~#1~} \\
but~there~is~no~key~called~'#1'.
}
\msg_new:nnnn { xtemplate } { unknown-choice }
{ The~choice~'#2'~was~not~declared~for~key~'#1'. }
{
The~key~'#1'~takes~a~fixed~list~of~choices~
and~this~list~does~not~include~'#2'.
}
\msg_new:nnnn { xtemplate } { unknown-default-choice }
{ The~default~choice~'#2'~was~not~declared~for~key~'#1'. }
{
The~key~'#1'~takes~a~fixed~list~of~choices~
and~this~list~does~not~include~'#2'.
}
\msg_new:nnnn { xtemplate } { unknown-instance }
{ The~instance~'#2'~of~type~'#1'~is~unknown. }
{
You~have~asked~to~use~an~instance~'#2',~
but~this~has~not~been~created.
}
\msg_new:nnnn { xtemplate } { unknown-key }
{ Unknown~template~key~'#1'. }
{
The~key~'#1'~was~not~declared~in~the~interface~
for~the~current~template.
}
\msg_new:nnnn { xtemplate } { unknown-keytype }
{ The~key-type~'#1'~is~unknown. }
{
Valid~key-types~are:\\
-~boolean;\\
-~choice;\\
-~code;\\
-~commalist;\\
-~function;\\
-~instance;\\
-~integer;\\
-~length;\\
-~muskip;\\
-~real;\\
-~skip;\\
-~tokenlist.
}
\msg_new:nnnn { xtemplate } { unknown-object-type }
{ The~object~type~'#1'~is~unknown. }
{
An~object~type~needs~to~be~declared~with~\DeclareObjectType
prior~to~using~it.
}
\msg_new:nnnn { xtemplate } { unknown-template }
{ The~template~'#2'~of~type~'#1'~is~unknown. }
{
No~interface~has~been~declared~for~a~template~
'#2'~of~object~type~'#1'.
}
% \end{macrocode}
%
% Information messages only have text: more text should not be needed.
% \begin{macrocode}
\msg_new:nnn { xtemplate } { declare-object-type }
{ Declaring~object~type~'#1'~taking~#2~argument(s)~\msg_line_context:. }
\msg_new:nnn { xtemplate } { declare-template-code }
{ Declaring~code~for~template~'#2'~of~object~type'#1'~\msg_line_context:. }
\msg_new:nnn { xtemplate } { declare-template-interface }
{
Declaring~interface~for~template~'#2'~of~object~type~'#1'~
\msg_line_context:.
}
\msg_new:nnn { xtemplate } { show-attribute }
{
The~template~'#2'~of~object~type~'#1'~has~
\tl_if_empty:nTF {#4} { no~#3. } { #3 : #4 }
}
\msg_new:nnn { xtemplate } { show-values }
{
\tl_if_empty:nTF {#2}
{ The~instance~'#3'~ }
{ The~collection~ instance~'#3'~ (from~collection~'#2')~ }
of~object~type~'#1'~has~
\tl_if_empty:nTF {#4} { no~values. } { values: #4 }
}
% \end{macrocode}
%
% \subsection{User functions}
%
% The user functions provided by \pkg{xtemplate} are pretty much direct
% copies of internal ones. However, by sticking to the \pkg{xparse}
% approach only the appropriate arguments are long.
%
% \begin{macro}{\DeclareObjectType}
% \begin{macro}{\DeclareTemplateInterface}
% \begin{macro}{\DeclareTemplateCode}
% \begin{macro}{\DeclareRestrictedTemplate}
% \begin{macro}{\EditTemplateDefaults}
% \begin{macro}{\DeclareInstance}
% \begin{macro}{\DeclareCollectionInstance}
% \begin{macro}{\EditInstance}
% \begin{macro}{\EditCollectionInstance}
% \begin{macro}{\UseTemplate}
% \begin{macro}{\UseInstance}
% \begin{macro}{\UseCollection}
% All simple translations, with the appropriate long/short argument
% filtering.
% \begin{macrocode}
\cs_new_protected:Npn \DeclareObjectType #1#2
{ \@@_declare_object_type:nn {#1} {#2} }
\cs_new_protected:Npn \DeclareTemplateInterface #1#2#3#4
{ \@@_declare_template_keys:nnnn {#1} {#2} {#3} {#4} }
\cs_new_protected:Npn \DeclareTemplateCode #1#2#3#4#5
{ \@@_declare_template_code:nnnnn {#1} {#2} {#3} {#4} {#5} }
\cs_new_protected:Npn \DeclareRestrictedTemplate #1#2#3#4
{ \@@_declare_restricted:nnnn {#1} {#2} {#3} {#4} }
\cs_new_protected:Npn \DeclareInstance #1#2#3#4
{ \@@_declare_instance:nnnnn {#1} {#3} { } {#2} {#4} }
\cs_new_protected:Npn \DeclareCollectionInstance #1#2#3#4#5
{ \@@_declare_instance:nnnnn {#2} {#4} {#1} {#3} {#5} }
\cs_new_protected:Npn \EditTemplateDefaults #1#2#3
{ \@@_edit_defaults:nnn {#1} {#2} {#3} }
\cs_new_protected:Npn \EditInstance #1#2#3
{ \@@_edit_instance:nnnn {#1} { } {#2} {#3} }
\cs_new_protected:Npn \EditCollectionInstance #1#2#3#4
{ \@@_edit_instance:nnnn {#2} {#1} {#3} {#4} }
\cs_new_protected:Npn \UseTemplate #1#2#3
{ \@@_use_template:nnn {#1} {#2} {#3} }
\cs_new_protected:Npn \UseInstance #1#2
{ \@@_use_instance:nn {#1} {#2} }
\cs_new_protected:Npn \UseCollection #1#2
{ \@@_use_collection:nn {#1} {#2} }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ShowTemplateCode}
% \begin{macro}{\ShowTemplateDefaults}
% \begin{macro}{\ShowTemplateInterface}
% \begin{macro}{\ShowTemplateVariables}
% \begin{macro}{\ShowInstanceValues}
% \begin{macro}{\ShowCollectionInstanceValues}
% The show functions are again just translation.
% \begin{macrocode}
\cs_new_protected:Npn \ShowTemplateCode #1#2
{ \@@_show_code:nn {#1} {#2} }
\cs_new_protected:Npn \ShowTemplateDefaults #1#2
{ \@@_show_defaults:nn {#1} {#2} }
\cs_new_protected:Npn \ShowTemplateInterface #1#2
{ \@@_show_keytypes:nn {#1} {#2} }
\cs_new_protected:Npn \ShowTemplateVariables #1#2
{ \@@_show_vars:nn {#1} {#2} }
\cs_new_protected:Npn \ShowInstanceValues #1#2
{ \@@_show_values:nnn {#1} { } {#2} }
\cs_new_protected:Npn \ShowCollectionInstanceValues #1#2#3
{ \@@_show_values:nnn {#1} {#2} {#3} }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\IfInstanceExistT, \IfInstanceExistF, \IfInstanceExistTF}
% More direct translation: only the base instance is checked for.
% \begin{macrocode}
\cs_new:Npn \IfInstanceExistTF #1#2
{ \@@_if_instance_exist:nnnTF {#1} { } {#2} }
\cs_new:Npn \IfInstanceExistT #1#2
{ \@@_if_instance_exist:nnnT {#1} { } {#2} }
\cs_new:Npn \IfInstanceExistF #1#2
{ \@@_if_instance_exist:nnnF {#1} { } {#2} }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\EvaluateNow}
% \begin{macro}{\KeyValue}
% These are both do nothing functions. Both simply dump their arguments
% when executed: this should not happen with \cs{KeyValue}.
% \begin{macrocode}
\cs_new_protected:Npn \EvaluateNow #1 {#1}
\cs_new_protected:Npn \KeyValue #1 {#1}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\AssignTemplateKeys}
% A short call to use a token register by proxy.
% \begin{macrocode}
\cs_new_protected:Npn \AssignTemplateKeys
{ \@@_assignments_pop: }
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
\cs_new_eq:NN \ShowTemplateKeytypes \ShowTemplateInterface
% \end{macrocode}
%
% \begin{macrocode}
%</package>
% \end{macrocode}
%
%\end{implementation}
%
%\PrintIndex
|