csharp-sqlite /TCL/src/commands/NamespaceCmd.cs

Language C# Lines 3675
MD5 Hash f366282c31d27bc290d1b7945940f83f Estimated Cost $45,651 (why?)
Repository https://bitbucket.org/eumario/csharp-sqlite.git View Raw File View Project SPDX
   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
#undef DEBUG
/*
* NamespaceCmd.java
*
* Copyright (c) 1993-1997 Lucent Technologies.
* Copyright (c) 1997 Sun Microsystems, Inc.
* Copyright (c) 1998-1999 by Scriptics Corporation.
* Copyright (c) 1999 Moses DeJong
*
* Originally implemented by
*   Michael J. McLennan
*   Bell Labs Innovations for Lucent Technologies
*   mmclennan@lucent.com
*
* See the file "license.terms" for information on usage and
* redistribution of this file, and for a DISCLAIMER OF ALL
* WARRANTIES.
*
* Included in SQLite3 port to C# for use in testharness only;  2008 Noah B Hart
*
* RCS @(#) $Id: NamespaceCmd.java,v 1.12 2001/05/05 22:38:13 mdejong Exp $
*/
using System;
using System.Collections;
using System.Text;

namespace tcl.lang
{

  /// <summary> This class implements the built-in "namespace" command in Tcl.
  /// See the user documentation for details on what it does.
  /// </summary>


  public class NamespaceCmd : InternalRep, Command
  {

    // Flag passed to getNamespaceForQualName to indicate that it should
    // search for a namespace rather than a command or variable inside a
    // namespace. Note that this flag's value must not conflict with the values
    // of TCL.VarFlag.GLOBAL_ONLY, TCL.VarFlag.NAMESPACE_ONLY, or TCL.VarFlag.CREATE_NS_IF_UNKNOWN.


    // Initial size of stack allocated space for tail list - used when resetting
    // shadowed command references in the functin: TclResetShadowedCmdRefs.

    //private static final int NUM_TRAIL_ELEMS = 5;

    // Count of the number of namespaces created. This value is used as a
    // unique id for each namespace.

    private static long numNsCreated = 0;
    private static Object nsMutex;

    //
    // Flags used to represent the status of a namespace:
    //
    // NS_DYING -	1 means deleteNamespace has been called to delete the
    //		namespace but there are still active call frames on the Tcl
    //		stack that refer to the namespace. When the last call frame
    //		referring to it has been popped, it's variables and command
    //		will be destroyed and it will be marked "dead" (NS_DEAD).
    //		The namespace can no longer be looked up by name.
    // NS_DEAD -	1 means deleteNamespace has been called to delete the
    //		namespace and no call frames still refer to it. Its
    //		variables and command have already been destroyed. This bit
    //		allows the namespace resolution code to recognize that the
    //		namespace is "deleted". When the last namespaceName object
    //		in any byte code code unit that refers to the namespace has
    //		been freed (i.e., when the namespace's refCount is 0), the
    //		namespace's storage will be freed.

    internal const int NS_DYING = 0x01;
    internal const int NS_DEAD = 0x02;


    // Flag passed to getNamespaceForQualName to have it create all namespace
    // components of a namespace-qualified name that cannot be found. The new
    // namespaces are created within their specified parent. Note that this
    // flag's value must not conflict with the values of the flags
    // TCL.VarFlag.GLOBAL_ONLY, TCL.VarFlag.NAMESPACE_ONLY, and TCL.VarFlag.FIND_ONLY_NS

    // internal const int TCL.VarFlag.CREATE_NS_IF_UNKNOWN = 0x800;


    // This value corresponds to the Tcl_Obj.otherValuePtr pointer used
    // in the C version of Tcl 8.1. Use it to keep track of a ResolvedNsName.

    private ResolvedNsName otherValue = null;


    /*
    *----------------------------------------------------------------------
    *
    * Tcl_GetCurrentNamespace -> getCurrentNamespace
    *
    *	Returns a reference to an interpreter's currently active namespace.
    *
    * Results:
    *	Returns a reference to the interpreter's current namespace.
    *
    * Side effects:
    *	None.
    *
    *----------------------------------------------------------------------
    */

    internal static Namespace getCurrentNamespace( Interp interp )
    {
      if ( interp.varFrame != null )
      {
        return interp.varFrame.ns;
      }
      else
      {
        return interp.globalNs;
      }
    }

    /*
    *----------------------------------------------------------------------
    *
    * Tcl_GetGlobalNamespace -> getGlobalNamespace
    *
    *	Returns a reference to an interpreter's global :: namespace.
    *
    * Results:
    *	Returns a reference to the specified interpreter's global namespace.
    *
    * Side effects:
    *	None.
    *
    *----------------------------------------------------------------------
    */

    internal static Namespace getGlobalNamespace( Interp interp )
    {
      return interp.globalNs;
    }


    /*
    *----------------------------------------------------------------------
    *
    * Tcl_PushCallFrame -> pushCallFrame
    *
    *	Pushes a new call frame onto the interpreter's Tcl call stack.
    *	Called when executing a Tcl procedure or a "namespace eval" or
    *	"namespace inscope" command. 
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Modifies the interpreter's Tcl call stack.
    *
    *----------------------------------------------------------------------
    */

    internal static void pushCallFrame( Interp interp, CallFrame frame, Namespace namespace_Renamed, bool isProcCallFrame )
    // If true, the frame represents a
    // called Tcl procedure and may have local
    // vars. Vars will ordinarily be looked up
    // in the frame. If new variables are
    // created, they will be created in the
    // frame. If false, the frame is for a
    // "namespace eval" or "namespace inscope"
    // command and var references are treated
    // as references to namespace variables.
    {
      Namespace ns;

      if ( namespace_Renamed == null )
      {
        ns = getCurrentNamespace( interp );
      }
      else
      {
        ns = namespace_Renamed;
        if ( ( ns.flags & NS_DEAD ) != 0 )
        {
          throw new TclRuntimeError( "Trying to push call frame for dead namespace" );
        }
      }

      ns.activationCount++;
      frame.ns = ns;
      frame.isProcCallFrame = isProcCallFrame;
      frame.objv = null;

      frame.caller = interp.frame;
      frame.callerVar = interp.varFrame;

      if ( interp.varFrame != null )
      {
        frame.level = ( interp.varFrame.level + 1 );
      }
      else
      {
        frame.level = 1;
      }

      // FIXME : does Jacl need a procPtr in the CallFrame class?
      //frame.procPtr = null; 	   // no called procedure

      frame.varTable = null; // and no local variables

      // Compiled locals are not part of Jacl's CallFrame

      // Push the new call frame onto the interpreter's stack of procedure
      // call frames making it the current frame.

      interp.frame = frame;
      interp.varFrame = frame;
    }



    /*
    *----------------------------------------------------------------------
    *
    * Tcl_PopCallFrame -> popCallFrame
    *
    *	Removes a call frame from the Tcl call stack for the interpreter.
    *	Called to remove a frame previously pushed by Tcl_PushCallFrame.
    *
    * Results:
    *	None.
    *
    * Side effects:
    *	Modifies the call stack of the interpreter. Resets various fields of
    *	the popped call frame. If a namespace has been deleted and
    *	has no more activations on the call stack, the namespace is
    *	destroyed.
    *
    *----------------------------------------------------------------------
    */

    internal static void popCallFrame( Interp interp )
    {
      CallFrame frame = interp.frame;
      int saveErrFlag;
      Namespace ns;

      // It's important to remove the call frame from the interpreter's stack
      // of call frames before deleting local variables, so that traces
      // invoked by the variable deletion don't see the partially-deleted
      // frame.

      interp.frame = frame.caller;
      interp.varFrame = frame.callerVar;

      // Delete the local variables. As a hack, we save then restore the
      // ERR_IN_PROGRESS flag in the interpreter. The problem is that there
      // could be unset traces on the variables, which cause scripts to be
      // evaluated. This will clear the ERR_IN_PROGRESS flag, losing stack
      // trace information if the procedure was exiting with an error. The
      // code below preserves the flag. Unfortunately, that isn't really
      // enough: we really should preserve the errorInfo variable too
      // (otherwise a nested error in the trace script will trash errorInfo).
      // What's really needed is a general-purpose mechanism for saving and
      // restoring interpreter state.

      saveErrFlag = ( interp.flags & Parser.ERR_IN_PROGRESS );

      if ( frame.varTable != null )
      {
        Var.deleteVars( interp, frame.varTable );
        frame.varTable = null;
      }

      interp.flags |= saveErrFlag;

      // Decrement the namespace's count of active call frames. If the
      // namespace is "dying" and there are no more active call frames,
      // call Tcl_DeleteNamespace to destroy it.

      ns = frame.ns;
      ns.activationCount--;
      if ( ( ( ns.flags & NS_DYING ) != 0 ) && ( ns.activationCount == 0 ) )
      {
        deleteNamespace( ns );
      }
      frame.ns = null;
    }

    /*
    *----------------------------------------------------------------------
    *
    * Tcl_CreateNamespace --
    *
    *	Creates a new namespace with the given name. If there is no
    *	active namespace (i.e., the interpreter is being initialized),
    *	the global :: namespace is created and returned.
    *
    * Results:
    *	Returns a reference to the new namespace if successful. If the
    *	namespace already exists or if another error occurs, this routine
    *	returns null, along with an error message in the interpreter's
    *	result object.
    *
    * Side effects:
    *	If the name contains "::" qualifiers and a parent namespace does
    *	not already exist, it is automatically created. 
    *
    *----------------------------------------------------------------------
    */

    internal static Namespace createNamespace( Interp interp, string name, DeleteProc deleteProc )
    {
      Namespace ns, ancestor;
      Namespace parent;
      Namespace globalNs = getGlobalNamespace( interp );
      string simpleName;
      StringBuilder buffer1, buffer2;

      // If there is no active namespace, the interpreter is being
      // initialized. 

      if ( ( globalNs == null ) && ( interp.varFrame == null ) )
      {
        // Treat this namespace as the global namespace, and avoid
        // looking for a parent.

        parent = null;
        simpleName = "";
      }
      else if ( name.Length == 0 )
      {
        /*
        TclObject tobj = interp.getResult();
        // FIXME : is there a test case to check this error result?
        TclString.append(tobj,
        "can't create namespace \"\": only global namespace can have empty name");
        */

        // FIXME : is there a test case to check this error result?
        interp.setResult( "can't create namespace \"\": only global namespace can have empty name" );
        return null;
      }
      else
      {
        // Find the parent for the new namespace.

        // Java does not support passing an address so we pass
        // an array of size 1 and then assign arr[0] to the value
        Namespace[] parentArr = new Namespace[1];
        Namespace[] dummyArr = new Namespace[1];
        string[] simpleArr = new string[1];

        getNamespaceForQualName( interp, name, null, ( TCL.VarFlag.CREATE_NS_IF_UNKNOWN | TCL.VarFlag.LEAVE_ERR_MSG ), parentArr, dummyArr, dummyArr, simpleArr );

        // Get the values out of the arrays!
        parent = parentArr[0];
        simpleName = simpleArr[0];


        // If the unqualified name at the end is empty, there were trailing
        // "::"s after the namespace's name which we ignore. The new
        // namespace was already (recursively) created and is referenced
        // by parent.

        if ( simpleName.Length == 0 )
        {
          return parent;
        }

        // Check for a bad namespace name and make sure that the name
        // does not already exist in the parent namespace.

        if ( parent.childTable[simpleName] != null )
        {
          /*
          TclObject tobj = interp.getResult();
          // FIXME : is there a test case to check this error result?
          TclString.append(tobj,
          "can't create namespace \"" + name + "\": already exists");
          */

          // FIXME : is there a test case to check this error result?
          interp.setResult( "can't create namespace \"" + name + "\": already exists" );
          return null;
        }
      }

      // Create the new namespace and root it in its parent. Increment the
      // count of namespaces created.

      ns = new Namespace();
      ns.name = simpleName;
      ns.fullName = null; // set below
      //ns.clientData       = clientData;
      ns.deleteProc = deleteProc;
      ns.parent = parent;
      ns.childTable = new Hashtable();
      lock ( nsMutex )
      {
        numNsCreated++;
        ns.nsId = numNsCreated;
      }
      ns.interp = interp;
      ns.flags = 0;
      ns.activationCount = 0;
      // FIXME : there was a problem with the refcount because
      // when the namespace was deleted the refocount was 0.
      // We avoid this by just using a refcount of 1 for now.
      // We can do ignore the refCount because GC will reclaim mem.
      //ns.refCount           = 0;
      ns.refCount = 1;
      ns.cmdTable = new Hashtable();
      ns.varTable = new Hashtable();
      ns.exportArray = null;
      ns.numExportPatterns = 0;
      ns.maxExportPatterns = 0;

      // Jacl does not use these tcl compiler specific members
      //ns.cmdRefEpoch        = 0;
      //ns.resolverEpoch      = 0;

      ns.resolver = null;

      if ( parent != null )
      {
        SupportClass.PutElement( parent.childTable, simpleName, ns );
      }

      // Build the fully qualified name for this namespace.

      buffer1 = new StringBuilder();
      buffer2 = new StringBuilder();
      for ( ancestor = ns; ancestor != null; ancestor = ancestor.parent )
      {
        if ( ancestor != globalNs )
        {
          buffer1.Append( "::" );
          buffer1.Append( ancestor.name );
        }
        buffer1.Append( buffer2 );

        buffer2.Length = 0;
        buffer2.Append( buffer1 );
        buffer1.Length = 0;
      }

      name = buffer2.ToString();
      ns.fullName = name;

      // Return a reference to the new namespace.

      return ns;
    }

    /*
    *----------------------------------------------------------------------
    *
    * Tcl_DeleteNamespace -> deleteNamespace
    *
    *	Deletes a namespace and all of the commands, variables, and other
    *	namespaces within it.
    *
    * Results:
    *	None.
    *
    * Side effects:
    *	When a namespace is deleted, it is automatically removed as a
    *	child of its parent namespace. Also, all its commands, variables
    *	and child namespaces are deleted.
    *
    *----------------------------------------------------------------------
    */

    internal static void deleteNamespace( Namespace namespace_Renamed )
    {
      Namespace ns = namespace_Renamed;
      Interp interp = ns.interp;
      Namespace globalNs = getGlobalNamespace( interp );

      // If the namespace is on the call frame stack, it is marked as "dying"
      // (NS_DYING is OR'd into its flags): the namespace can't be looked up
      // by name but its commands and variables are still usable by those
      // active call frames. When all active call frames referring to the
      // namespace have been popped from the Tcl stack, popCallFrame will
      // call this procedure again to delete everything in the namespace.
      // If no nsName objects refer to the namespace (i.e., if its refCount 
      // is zero), its commands and variables are deleted and the storage for
      // its namespace structure is freed. Otherwise, if its refCount is
      // nonzero, the namespace's commands and variables are deleted but the
      // structure isn't freed. Instead, NS_DEAD is OR'd into the structure's
      // flags to allow the namespace resolution code to recognize that the
      // namespace is "deleted".

      if ( ns.activationCount > 0 )
      {
        ns.flags |= NS_DYING;
        if ( ns.parent != null )
        {
          ns.parent.childTable.Remove( ns.name );
        }
        ns.parent = null;
      }
      else
      {
        // Delete the namespace and everything in it. If this is the global
        // namespace, then clear it but don't free its storage unless the
        // interpreter is being torn down.

        teardownNamespace( ns );

        if ( ( ns != globalNs ) || ( ( interp.flags & Parser.DELETED ) != 0 ) )
        {
          // If this is the global namespace, then it may have residual
          // "errorInfo" and "errorCode" variables for errors that
          // occurred while it was being torn down.  Try to clear the
          // variable list one last time.

          Var.deleteVars( ns.interp, ns.varTable );

          ns.childTable.Clear();
          ns.cmdTable.Clear();

          // If the reference count is 0, then discard the namespace.
          // Otherwise, mark it as "dead" so that it can't be used.

          if ( ns.refCount == 0 )
          {
            free( ns );
          }
          else
          {
            ns.flags |= NS_DEAD;
          }
        }
      }
    }


    /*
    *----------------------------------------------------------------------
    *
    * TclTeardownNamespace -> teardownNamespace
    *
    *	Used internally to dismantle and unlink a namespace when it is
    *	deleted. Divorces the namespace from its parent, and deletes all
    *	commands, variables, and child namespaces.
    *
    *	This is kept separate from Tcl_DeleteNamespace so that the global
    *	namespace can be handled specially. Global variables like
    *	"errorInfo" and "errorCode" need to remain intact while other
    *	namespaces and commands are torn down, in case any errors occur.
    *
    * Results:
    *	None.
    *
    * Side effects:
    *	Removes this namespace from its parent's child namespace hashtable.
    *	Deletes all commands, variables and namespaces in this namespace.
    *	If this is the global namespace, the "errorInfo" and "errorCode"
    *	variables are left alone and deleted later.
    *
    *----------------------------------------------------------------------
    */

    internal static void teardownNamespace( Namespace ns )
    {
      Interp interp = ns.interp;
      IEnumerator search;
      Namespace globalNs = getGlobalNamespace( interp );
      int i;

      // Start by destroying the namespace's variable table,
      // since variables might trigger traces.

      if ( ns == globalNs )
      {
        // This is the global namespace, so be careful to preserve the
        // "errorInfo" and "errorCode" variables. These might be needed
        // later on if errors occur while deleting commands. We are careful
        // to destroy and recreate the "errorInfo" and "errorCode"
        // variables, in case they had any traces on them.

        string errorInfoStr, errorCodeStr;

        try
        {

          errorInfoStr = interp.getVar( "errorInfo", TCL.VarFlag.GLOBAL_ONLY ).ToString();
        }
        catch ( TclException e )
        {
          errorInfoStr = null;
        }

        try
        {

          errorCodeStr = interp.getVar( "errorCode", TCL.VarFlag.GLOBAL_ONLY ).ToString();
        }
        catch ( TclException e )
        {
          errorCodeStr = null;
        }

        Var.deleteVars( interp, ns.varTable );

        if ( (System.Object)errorInfoStr != null )
        {
          try
          {
            interp.setVar( "errorInfo", errorInfoStr, TCL.VarFlag.GLOBAL_ONLY );
          }
          catch ( TclException e )
          {
            // ignore an exception while setting this var
          }
        }
        if ( (System.Object)errorCodeStr != null )
        {
          try
          {
            interp.setVar( "errorCode", errorCodeStr, TCL.VarFlag.GLOBAL_ONLY );
          }
          catch ( TclException e )
          {
            // ignore an exception while setting this var
          }
        }
      }
      else
      {
        // Variable table should be cleared.
        Var.deleteVars( interp, ns.varTable );
      }

      // Remove the namespace from its parent's child hashtable.

      if ( ns.parent != null )
      {
        ns.parent.childTable.Remove( ns.name );
      }
      ns.parent = null;

      // Delete all the child namespaces.
      //
      // BE CAREFUL: When each child is deleted, it will divorce
      //    itself from its parent. You can't traverse a hash table
      //    properly if its elements are being deleted. We use only
      //    the Tcl_FirstHashEntry function to be safe.

      foreach ( Namespace childNs in new ArrayList( ns.childTable.Values ) )
      {
        deleteNamespace( childNs );
      }

      // Delete all commands in this namespace. Be careful when traversing the
      // hash table: when each command is deleted, it removes itself from the
      // command table.

      // FIXME : double check that using an enumeration for a hashtable
      // that changes is ok in Java! Also call deleteCommand... correctly!
      foreach ( WrappedCommand cmd in new ArrayList( ns.cmdTable.Values ) )
      {
        interp.deleteCommandFromToken( cmd );
      }

      ns.cmdTable.Clear();

      // Free the namespace's export pattern array.

      if ( ns.exportArray != null )
      {
        ns.exportArray = null;
        ns.numExportPatterns = 0;
        ns.maxExportPatterns = 0;
      }

      // Callback invoked when namespace is deleted

      if ( ns.deleteProc != null )
      {
        ns.deleteProc.delete();
      }
      ns.deleteProc = null;

      // Reset the namespace's id field to ensure that this namespace won't
      // be interpreted as valid by, e.g., the cache validation code for
      // cached command references in Tcl_GetCommandFromObj.

      ns.nsId = 0;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceFree -> free
    *
    *	Called after a namespace has been deleted, when its
    *	reference count reaches 0.  Frees the data structure
    *	representing the namespace.
    *
    * Results:
    *	None.
    *
    * Side effects:
    *	None.
    *
    *----------------------------------------------------------------------
    */

    internal static void free( Namespace ns )
    {
      // Most of the namespace's contents are freed when the namespace is
      // deleted by Tcl_DeleteNamespace. All that remains is to free its names
      // (for error messages), and the structure itself.

      ns.name = null;
      ns.fullName = null;
    }

    /*
    *----------------------------------------------------------------------
    *
    * Tcl_Export -> exportList
    *
    *	Makes all the commands matching a pattern available to later be
    *	imported from the namespace specified by namespace (or the
    *	current namespace if namespace is null). The specified pattern is
    *	appended onto the namespace's export pattern list, which is
    *	optionally cleared beforehand.
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Appends the export pattern onto the namespace's export list.
    *	Optionally reset the namespace's export pattern list.
    *
    *----------------------------------------------------------------------
    */

    internal static void exportList( Interp interp, Namespace namespace_Renamed, string pattern, bool resetListFirst )
    {
      int INIT_EXPORT_PATTERNS = 5;
      Namespace ns, exportNs;
      Namespace currNs = getCurrentNamespace( interp );
      string simplePattern, patternCpy;
      int neededElems, len, i;

      // If the specified namespace is null, use the current namespace.

      if ( namespace_Renamed == null )
      {
        ns = currNs;
      }
      else
      {
        ns = namespace_Renamed;
      }

      // If resetListFirst is true (nonzero), clear the namespace's export
      // pattern list.

      if ( resetListFirst )
      {
        if ( ns.exportArray != null )
        {
          for ( i = 0; i < ns.numExportPatterns; i++ )
          {
            ns.exportArray[i] = null;
          }
          ns.exportArray = null;
          ns.numExportPatterns = 0;
          ns.maxExportPatterns = 0;
        }
      }

      // Check that the pattern doesn't have namespace qualifiers.

      // Java does not support passing an address so we pass
      // an array of size 1 and then assign arr[0] to the value
      Namespace[] exportNsArr = new Namespace[1];
      Namespace[] dummyArr = new Namespace[1];
      string[] simplePatternArr = new string[1];

      getNamespaceForQualName( interp, pattern, ns, TCL.VarFlag.LEAVE_ERR_MSG, exportNsArr, dummyArr, dummyArr, simplePatternArr );

      // get the values out of the arrays

      exportNs = exportNsArr[0];
      simplePattern = simplePatternArr[0];

      if ( ( exportNs != ns ) || ( pattern.CompareTo( simplePattern ) != 0 ) )
      {
        throw new TclException( interp, "invalid export pattern \"" + pattern + "\": pattern can't specify a namespace" );
      }

      // Make sure there is room in the namespace's pattern array for the
      // new pattern.

      neededElems = ns.numExportPatterns + 1;
      if ( ns.exportArray == null )
      {
        ns.exportArray = new string[INIT_EXPORT_PATTERNS];
        ns.numExportPatterns = 0;
        ns.maxExportPatterns = INIT_EXPORT_PATTERNS;
      }
      else if ( neededElems > ns.maxExportPatterns )
      {
        int numNewElems = 2 * ns.maxExportPatterns;
        string[] newArray = new string[numNewElems];
        Array.Copy( (System.Array)ns.exportArray, 0, (System.Array)newArray, 0, ns.numExportPatterns );
        ns.exportArray = newArray;
        ns.maxExportPatterns = numNewElems;
      }

      // Add the pattern to the namespace's array of export patterns.

      ns.exportArray[ns.numExportPatterns] = pattern;
      ns.numExportPatterns++;
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * Tcl_AppendExportList -> appendExportList
    *
    *	Appends onto the argument object the list of export patterns for the
    *	specified namespace.
    *
    * Results:
    *	The method will return when successful; in this case the object
    *	referenced by obj has each export pattern appended to it. If an
    *	error occurs, an exception and the interpreter's result
    *	holds an error message.
    *
    * Side effects:
    *	If necessary, the object referenced by obj is converted into
    *	a list object.
    *
    *----------------------------------------------------------------------
    */

    internal static void appendExportList( Interp interp, Namespace namespace_Renamed, TclObject obj )
    {
      Namespace ns;
      int i;

      // If the specified namespace is null, use the current namespace.

      if ( namespace_Renamed == null )
      {
        ns = getCurrentNamespace( interp );
      }
      else
      {
        ns = namespace_Renamed;
      }

      // Append the export pattern list onto objPtr.

      for ( i = 0; i < ns.numExportPatterns; i++ )
      {
        TclList.append( interp, obj, TclString.newInstance( ns.exportArray[i] ) );
      }
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * Tcl_Import -> importList
    *
    *	Imports all of the commands matching a pattern into the namespace
    *	specified by namespace (or the current namespace if namespace
    *	is null). This is done by creating a new command (the "imported
    *	command") that points to the real command in its original namespace.
    *
    *      If matching commands are on the autoload path but haven't been
    *	loaded yet, this command forces them to be loaded, then creates
    *	the links to them.
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Creates new commands in the importing namespace. These indirect
    *	calls back to the real command and are deleted if the real commands
    *	are deleted.
    *
    *----------------------------------------------------------------------
    */

    internal static void importList( Interp interp, Namespace namespace_Renamed, string pattern, bool allowOverwrite )
    {
      Namespace ns, importNs;
      Namespace currNs = getCurrentNamespace( interp );
      string simplePattern, cmdName;
      IEnumerator search;
      WrappedCommand cmd, realCmd;
      ImportRef ref_Renamed;
      WrappedCommand autoCmd, importedCmd;
      ImportedCmdData data;
      bool wasExported;
      int i, result;

      // If the specified namespace is null, use the current namespace.

      if ( namespace_Renamed == null )
      {
        ns = currNs;
      }
      else
      {
        ns = namespace_Renamed;
      }

      // First, invoke the "auto_import" command with the pattern
      // being imported.  This command is part of the Tcl library.
      // It looks for imported commands in autoloaded libraries and
      // loads them in.  That way, they will be found when we try
      // to create links below.

      autoCmd = findCommand( interp, "auto_import", null, TCL.VarFlag.GLOBAL_ONLY );

      if ( autoCmd != null )
      {
        TclObject[] objv = new TclObject[2];

        objv[0] = TclString.newInstance( "auto_import" );
        objv[0].preserve();
        objv[1] = TclString.newInstance( pattern );
        objv[1].preserve();

        cmd = autoCmd;
        try
        {
          // Invoke the command with the arguments
          cmd.cmd.cmdProc( interp, objv );
        }
        finally
        {
          objv[0].release();
          objv[1].release();
        }

        interp.resetResult();
      }

      // From the pattern, find the namespace from which we are importing
      // and get the simple pattern (no namespace qualifiers or ::'s) at
      // the end.

      if ( pattern.Length == 0 )
      {
        throw new TclException( interp, "empty import pattern" );
      }

      // Java does not support passing an address so we pass
      // an array of size 1 and then assign arr[0] to the value
      Namespace[] importNsArr = new Namespace[1];
      Namespace[] dummyArr = new Namespace[1];
      string[] simplePatternArr = new string[1];

      getNamespaceForQualName( interp, pattern, ns, TCL.VarFlag.LEAVE_ERR_MSG, importNsArr, dummyArr, dummyArr, simplePatternArr );

      importNs = importNsArr[0];
      simplePattern = simplePatternArr[0];

      if ( importNs == null )
      {
        throw new TclException( interp, "unknown namespace in import pattern \"" + pattern + "\"" );
      }
      if ( importNs == ns )
      {
        if ( (System.Object)pattern == (System.Object)simplePattern )
        {
          throw new TclException( interp, "no namespace specified in import pattern \"" + pattern + "\"" );
        }
        else
        {
          throw new TclException( interp, "import pattern \"" + pattern + "\" tries to import from namespace \"" + importNs.name + "\" into itself" );
        }
      }

      // Scan through the command table in the source namespace and look for
      // exported commands that match the string pattern. Create an "imported
      // command" in the current namespace for each imported command; these
      // commands redirect their invocations to the "real" command.


      for ( search = importNs.cmdTable.Keys.GetEnumerator(); search.MoveNext(); )
      {

        cmdName = ( (string)search.Current );
        if ( Util.stringMatch( cmdName, simplePattern ) )
        {
          // The command cmdName in the source namespace matches the
          // pattern. Check whether it was exported. If it wasn't,
          // we ignore it.

          wasExported = false;
          for ( i = 0; i < importNs.numExportPatterns; i++ )
          {
            if ( Util.stringMatch( cmdName, importNs.exportArray[i] ) )
            {
              wasExported = true;
              break;
            }
          }
          if ( !wasExported )
          {
            continue;
          }

          // Unless there is a name clash, create an imported command
          // in the current namespace that refers to cmdPtr.

          if ( ( ns.cmdTable[cmdName] == null ) || allowOverwrite )
          {
            // Create the imported command and its client data.
            // To create the new command in the current namespace, 
            // generate a fully qualified name for it.

            StringBuilder ds;

            ds = new StringBuilder();
            ds.Append( ns.fullName );
            if ( ns != interp.globalNs )
            {
              ds.Append( "::" );
            }
            ds.Append( cmdName );

            // Check whether creating the new imported command in the
            // current namespace would create a cycle of imported->real
            // command references that also would destroy an existing
            // "real" command already in the current namespace.

            cmd = (WrappedCommand)importNs.cmdTable[cmdName];

            if ( cmd.cmd is ImportedCmdData )
            {
              // This is actually an imported command, find
              // the real command it references
              realCmd = getOriginalCommand( cmd );
              if ( ( realCmd != null ) && ( realCmd.ns == currNs ) && ( currNs.cmdTable[cmdName] != null ) )
              {
                throw new TclException( interp, "import pattern \"" + pattern + "\" would create a loop containing command \"" + ds.ToString() + "\"" );
              }
            }

            data = new ImportedCmdData();

            // Create the imported command inside the interp
            interp.createCommand( ds.ToString(), data );

            // Lookup in the namespace for the new WrappedCommand
            importedCmd = findCommand( interp, ds.ToString(), ns, ( TCL.VarFlag.NAMESPACE_ONLY | TCL.VarFlag.LEAVE_ERR_MSG ) );

            data.realCmd = cmd;
            data.self = importedCmd;

            // Create an ImportRef structure describing this new import
            // command and add it to the import ref list in the "real"
            // command.

            ref_Renamed = new ImportRef();
            ref_Renamed.importedCmd = importedCmd;
            ref_Renamed.next = cmd.importRef;
            cmd.importRef = ref_Renamed;
          }
          else
          {
            throw new TclException( interp, "can't import command \"" + cmdName + "\": already exists" );
          }
        }
      }
      return;
    }

    /*
    *----------------------------------------------------------------------
    *
    * Tcl_ForgetImport -> forgetImport
    *
    *	Deletes previously imported commands. Given a pattern that may
    *	include the name of an exporting namespace, this procedure first
    *	finds all matching exported commands. It then looks in the namespace
    *	specified by namespace for any corresponding previously imported
    *	commands, which it deletes. If namespace is null, commands are
    *	deleted from the current namespace.
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	May delete commands. 
    *
    *----------------------------------------------------------------------
    */

    internal static void forgetImport( Interp interp, Namespace namespace_Renamed, string pattern )
    {
      Namespace ns, importNs, actualCtx;
      string simplePattern, cmdName;
      IEnumerator search;
      WrappedCommand cmd;

      // If the specified namespace is null, use the current namespace.

      if ( namespace_Renamed == null )
      {
        ns = getCurrentNamespace( interp );
      }
      else
      {
        ns = namespace_Renamed;
      }

      // From the pattern, find the namespace from which we are importing
      // and get the simple pattern (no namespace qualifiers or ::'s) at
      // the end.

      // Java does not support passing an address so we pass
      // an array of size 1 and then assign arr[0] to the value
      Namespace[] importNsArr = new Namespace[1];
      Namespace[] dummyArr = new Namespace[1];
      Namespace[] actualCtxArr = new Namespace[1];
      string[] simplePatternArr = new string[1];

      getNamespaceForQualName( interp, pattern, ns, TCL.VarFlag.LEAVE_ERR_MSG, importNsArr, dummyArr, actualCtxArr, simplePatternArr );

      // get the values out of the arrays
      importNs = importNsArr[0];
      actualCtx = actualCtxArr[0];
      simplePattern = simplePatternArr[0];

      // FIXME : the above call passes TCL.VarFlag.LEAVE_ERR_MSG, but
      // it seems like this will be a problem when exception is raised!
      if ( importNs == null )
      {
        throw new TclException( interp, "unknown namespace in namespace forget pattern \"" + pattern + "\"" );
      }

      // Scan through the command table in the source namespace and look for
      // exported commands that match the string pattern. If the current
      // namespace has an imported command that refers to one of those real
      // commands, delete it.


      for ( search = importNs.cmdTable.Keys.GetEnumerator(); search.MoveNext(); )
      {

        cmdName = ( (string)search.Current );
        if ( Util.stringMatch( cmdName, simplePattern ) )
        {
          cmd = (WrappedCommand)ns.cmdTable[cmdName];
          if ( cmd != null )
          {
            // cmd of same name in current namespace
            if ( cmd.cmd is ImportedCmdData )
            {
              interp.deleteCommandFromToken( cmd );
            }
          }
        }
      }
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * TclGetOriginalCommand -> getOriginalCommand
    *
    *	An imported command is created in a namespace when a "real" command
    *	is imported from another namespace. If the specified command is an
    *	imported command, this procedure returns the original command it
    *	refers to.
    *
    * Results:
    *	If the command was imported into a sequence of namespaces a, b,...,n
    *	where each successive namespace just imports the command from the
    *	previous namespace, this procedure returns the Tcl_Command token in
    *	the first namespace, a. Otherwise, if the specified command is not
    *	an imported command, the procedure returns null.
    *
    * Side effects:
    *	None.
    *
    *----------------------------------------------------------------------
    */

    internal static WrappedCommand getOriginalCommand( WrappedCommand command )
    {
      WrappedCommand cmd = command;
      ImportedCmdData data;

      if ( !( cmd.cmd is ImportedCmdData ) )
      {
        return null;
      }

      while ( cmd.cmd is ImportedCmdData )
      {
        data = (ImportedCmdData)cmd.cmd;
        cmd = data.realCmd;
      }
      return cmd;
    }


    /*
    *----------------------------------------------------------------------
    *
    * InvokeImportedCmd -> invokeImportedCmd
    *
    *	Invoked by Tcl whenever the user calls an imported command that
    *	was created by Tcl_Import. Finds the "real" command (in another
    *	namespace), and passes control to it.
    *
    * Results:
    *	Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Returns a result in the interpreter's result object. If anything
    *	goes wrong, the result object is set to an error message.
    *
    *----------------------------------------------------------------------
    */

    internal static void invokeImportedCmd( Interp interp, ImportedCmdData data, TclObject[] objv )
    {
      WrappedCommand realCmd = data.realCmd;
      realCmd.cmd.cmdProc( interp, objv );
    }


    /*
    *----------------------------------------------------------------------
    *
    * DeleteImportedCmd -> deleteImportedCmd
    *
    *	Invoked by Tcl whenever an imported command is deleted. The "real"
    *	command keeps a list of all the imported commands that refer to it,
    *	so those imported commands can be deleted when the real command is
    *	deleted. This procedure removes the imported command reference from
    *	the real command's list, and frees up the memory associated with
    *	the imported command.
    *
    * Results:
    *	None.
    *
    * Side effects:
    *	Removes the imported command from the real command's import list.
    *
    *----------------------------------------------------------------------
    */

    internal static void deleteImportedCmd( ImportedCmdData data )
    // The data object for this imported command
    {
      WrappedCommand realCmd = data.realCmd;
      WrappedCommand self = data.self;
      ImportRef ref_Renamed, prev;

      prev = null;
      for ( ref_Renamed = realCmd.importRef; ref_Renamed != null; ref_Renamed = ref_Renamed.next )
      {
        if ( ref_Renamed.importedCmd == self )
        {
          // Remove ref from real command's list of imported commands
          // that refer to it.

          if ( prev == null )
          {
            // ref is first in list
            realCmd.importRef = ref_Renamed.next;
          }
          else
          {
            prev.next = ref_Renamed.next;
          }
          ref_Renamed = null;
          data = null;
          return;
        }
        prev = ref_Renamed;
      }

      throw new TclRuntimeError( "DeleteImportedCmd: did not find cmd in real cmd's list of import references" );
    }

    /*
    *----------------------------------------------------------------------
    *
    * TclGetNamespaceForQualName -> getNamespaceForQualName
    *
    *	Given a qualified name specifying a command, variable, or namespace,
    *	and a namespace in which to resolve the name, this procedure returns
    *	a pointer to the namespace that contains the item. A qualified name
    *	consists of the "simple" name of an item qualified by the names of
    *	an arbitrary number of containing namespace separated by "::"s. If
    *	the qualified name starts with "::", it is interpreted absolutely
    *	from the global namespace. Otherwise, it is interpreted relative to
    *	the namespace specified by cxtNsPtr if it is non-null. If cxtNsPtr
    *	is null, the name is interpreted relative to the current namespace.
    *
    *	A relative name like "foo::bar::x" can be found starting in either
    *	the current namespace or in the global namespace. So each search
    *	usually follows two tracks, and two possible namespaces are
    *	returned. If the procedure sets either nsPtrPtr[0] or altNsPtrPtr[0] to
    *	null, then that path failed.
    *
    *	If "flags" contains TCL.VarFlag.GLOBAL_ONLY, the relative qualified name is
    *	sought only in the global :: namespace. The alternate search
    *	(also) starting from the global namespace is ignored and
    *	altNsPtrPtr[0] is set null. 
    *
    *	If "flags" contains TCL.VarFlag.NAMESPACE_ONLY, the relative qualified
    *	name is sought only in the namespace specified by cxtNsPtr. The
    *	alternate search starting from the global namespace is ignored and
    *	altNsPtrPtr[0] is set null. If both TCL.VarFlag.GLOBAL_ONLY and
    *	TCL.VarFlag.NAMESPACE_ONLY are specified, TCL.VarFlag.GLOBAL_ONLY is ignored and
    *	the search starts from the namespace specified by cxtNsPtr.
    *
    *	If "flags" contains TCL.VarFlag.CREATE_NS_IF_UNKNOWN, all namespace
    *	components of the qualified name that cannot be found are
    *	automatically created within their specified parent. This makes sure
    *	that functions like Tcl_CreateCommand always succeed. There is no
    *	alternate search path, so altNsPtrPtr[0] is set null.
    *
    *	If "flags" contains TCL.VarFlag.FIND_ONLY_NS, the qualified name is treated as a
    *	reference to a namespace, and the entire qualified name is
    *	followed. If the name is relative, the namespace is looked up only
    *	in the current namespace. A pointer to the namespace is stored in
    *	nsPtrPtr[0] and null is stored in simpleNamePtr[0]. Otherwise, if
    *	TCL.VarFlag.FIND_ONLY_NS is not specified, only the leading components are
    *	treated as namespace names, and a pointer to the simple name of the
    *	final component is stored in simpleNamePtr[0].
    *
    * Results:
    *	It sets nsPtrPtr[0] and altNsPtrPtr[0] to point to the two possible
    *	namespaces which represent the last (containing) namespace in the
    *	qualified name. If the procedure sets either nsPtrPtr[0] or altNsPtrPtr[0]
    *	to null, then the search along that path failed.  The procedure also
    *	stores a pointer to the simple name of the final component in
    *	simpleNamePtr[0]. If the qualified name is "::" or was treated as a
    *	namespace reference (TCL.VarFlag.FIND_ONLY_NS), the procedure stores a pointer
    *	to the namespace in nsPtrPtr[0], null in altNsPtrPtr[0], and sets
    *	simpleNamePtr[0] to an empty string.
    *
    *	If there is an error, this procedure returns TCL_ERROR. If "flags"
    *	contains TCL_LEAVE_ERR_MSG, an error message is returned in the
    *	interpreter's result object. Otherwise, the interpreter's result
    *	object is left unchanged.
    *
    *	actualCxtPtrPtr[0] is set to the actual context namespace. It is
    *	set to the input context namespace pointer in cxtNsPtr. If cxtNsPtr
    *	is null, it is set to the current namespace context.
    *
    * Side effects:
    *	If "flags" contains TCL.VarFlag.CREATE_NS_IF_UNKNOWN, new namespaces may be
    *	created.
    *
    *----------------------------------------------------------------------
    */

    internal static void getNamespaceForQualName( Interp interp, string qualName, Namespace cxtNsPtr, TCL.VarFlag flags, Namespace[] nsPtrPtr, Namespace[] altNsPtrPtr, Namespace[] actualCxtPtrPtr, string[] simpleNamePtr )
    {


      // FIXME : remove extra method call checks when we are sure this works!

      if ( true )
      {
        // check invariants
        if ( ( nsPtrPtr == null ) || ( nsPtrPtr.Length != 1 ) )
        {

          throw new System.SystemException( "nsPtrPtr " + nsPtrPtr );
        }
        if ( ( altNsPtrPtr == null ) || ( altNsPtrPtr.Length != 1 ) )
        {

          throw new System.SystemException( "altNsPtrPtr " + altNsPtrPtr );
        }
        if ( ( actualCxtPtrPtr == null ) || ( actualCxtPtrPtr.Length != 1 ) )
        {

          throw new System.SystemException( "actualCxtPtrPtr " + actualCxtPtrPtr );
        }
        if ( ( simpleNamePtr == null ) || ( simpleNamePtr.Length != 1 ) )
        {

          throw new System.SystemException( "simpleNamePtr " + simpleNamePtr );
        }
      }




      Namespace ns = cxtNsPtr;
      Namespace altNs;
      Namespace globalNs = getGlobalNamespace( interp );
      Namespace entryNs;
      string start, end;
      string nsName;
      int len;
      int start_ind, end_ind, name_len;

      // Determine the context namespace ns in which to start the primary
      // search. If TCL.VarFlag.NAMESPACE_ONLY or TCL.VarFlag.FIND_ONLY_NS was specified, search
      // from the current namespace. If the qualName name starts with a "::"
      // or TCL.VarFlag.GLOBAL_ONLY was specified, search from the global
      // namespace. Otherwise, use the given namespace given in cxtNsPtr, or
      // if that is null, use the current namespace context. Note that we
      // always treat two or more adjacent ":"s as a namespace separator.

      if ( ( flags & ( TCL.VarFlag.NAMESPACE_ONLY | TCL.VarFlag.FIND_ONLY_NS ) ) != 0 )
      {
        ns = getCurrentNamespace( interp );
      }
      else if ( ( flags & TCL.VarFlag.GLOBAL_ONLY ) != 0 )
      {
        ns = globalNs;
      }
      else if ( ns == null )
      {
        if ( interp.varFrame != null )
        {
          ns = interp.varFrame.ns;
        }
        else
        {
          ns = interp.globalNs;
        }
      }



      start_ind = 0;
      name_len = qualName.Length;

      if ( ( name_len >= 2 ) && ( qualName[0] == ':' ) && ( qualName[1] == ':' ) )
      {
        start_ind = 2; // skip over the initial ::

        while ( ( start_ind < name_len ) && ( qualName[start_ind] == ':' ) )
        {
          start_ind++; // skip over a subsequent :
        }

        ns = globalNs;
        if ( start_ind >= name_len )
        {
          // qualName is just two or more ":"s
          nsPtrPtr[0] = globalNs;
          altNsPtrPtr[0] = null;
          actualCxtPtrPtr[0] = globalNs;
          simpleNamePtr[0] = ""; // points to empty string
          return;
        }
      }
      actualCxtPtrPtr[0] = ns;


      // Start an alternate search path starting with the global namespace.
      // However, if the starting context is the global namespace, or if the
      // flag is set to search only the namespace cxtNs, ignore the
      // alternate search path.


      altNs = globalNs;
      if ( ( ns == globalNs ) || ( ( flags & ( TCL.VarFlag.NAMESPACE_ONLY | TCL.VarFlag.FIND_ONLY_NS ) ) != 0 ) )
      {
        altNs = null;
      }


      // Loop to resolve each namespace qualifier in qualName.	

      end_ind = start_ind;

      while ( start_ind < name_len )
      {
        // Find the next namespace qualifier (i.e., a name ending in "::")
        // or the end of the qualified name  (i.e., a name ending in "\0").
        // Set len to the number of characters, starting from start,
        // in the name; set end to point after the "::"s or at the "\0".

        len = 0;
        for ( end_ind = start_ind; end_ind < name_len; end_ind++ )
        {
          if ( ( ( name_len - end_ind ) > 1 ) && ( qualName[end_ind] == ':' ) && ( qualName[end_ind + 1] == ':' ) )
          {
            end_ind += 2; // skip over the initial ::
            while ( ( end_ind < name_len ) && ( qualName[end_ind] == ':' ) )
            {
              end_ind++; // skip over a subsequent :
            }
            break;
          }
          len++;
        }


        if ( ( end_ind == name_len ) && !( ( end_ind - start_ind >= 2 ) && ( ( qualName[end_ind - 1] == ':' ) && ( qualName[end_ind - 2] == ':' ) ) ) )
        {

          // qualName ended with a simple name at start. If TCL.VarFlag.FIND_ONLY_NS
          // was specified, look this up as a namespace. Otherwise,
          // start is the name of a cmd or var and we are done.

          if ( ( flags & TCL.VarFlag.FIND_ONLY_NS ) != 0 )
          {
            // assign the string from start_ind to the end of the name string
            nsName = qualName.Substring( start_ind );
          }
          else
          {
            nsPtrPtr[0] = ns;
            altNsPtrPtr[0] = altNs;
            simpleNamePtr[0] = qualName.Substring( start_ind );
            return;
          }
        }
        else
        {
          // start points to the beginning of a namespace qualifier ending
          // in "::". Create new string with the namespace qualifier.

          nsName = qualName.Substring( start_ind, ( start_ind + len ) - ( start_ind ) );
        }



        // Look up the namespace qualifier nsName in the current namespace
        // context. If it isn't found but TCL.VarFlag.CREATE_NS_IF_UNKNOWN is set,
        // create that qualifying namespace. This is needed for procedures
        // like Tcl_CreateCommand that cannot fail.

        if ( ns != null )
        {
          entryNs = (Namespace)ns.childTable[nsName];
          if ( entryNs != null )
          {
            ns = entryNs;
          }
          else if ( ( flags & TCL.VarFlag.CREATE_NS_IF_UNKNOWN ) != 0 )
          {
            CallFrame frame = interp.newCallFrame();

            pushCallFrame( interp, frame, ns, false );
            ns = createNamespace( interp, nsName, null );

            popCallFrame( interp );
            if ( ns == null )
            {
              throw new System.SystemException( "Could not create namespace " + nsName );
            }
          }
          else
          {
            ns = null; // namespace not found and wasn't created
          }
        }


        // Look up the namespace qualifier in the alternate search path too.

        if ( altNs != null )
        {
          altNs = (Namespace)altNs.childTable[nsName];
        }

        // If both search paths have failed, return null results.

        if ( ( ns == null ) && ( altNs == null ) )
        {
          nsPtrPtr[0] = null;
          altNsPtrPtr[0] = null;
          simpleNamePtr[0] = null;
          return;
        }

        start_ind = end_ind;
      }


      // We ignore trailing "::"s in a namespace name, but in a command or
      // variable name, trailing "::"s refer to the cmd or var named {}.

      if ( ( ( flags & TCL.VarFlag.FIND_ONLY_NS ) != 0 ) || ( ( end_ind > start_ind ) && ( qualName[end_ind - 1] != ':' ) ) )
      {
        simpleNamePtr[0] = null; // found namespace name
      }
      else
      {
        // FIXME : make sure this does not throw exception when end_ind is at the end of the string 
        simpleNamePtr[0] = qualName.Substring( end_ind ); // found cmd/var: points to empty string
      }


      // As a special case, if we are looking for a namespace and qualName
      // is "" and the current active namespace (ns) is not the global
      // namespace, return null (no namespace was found). This is because
      // namespaces can not have empty names except for the global namespace.

      if ( ( ( flags & TCL.VarFlag.FIND_ONLY_NS ) != 0 ) && ( name_len == 0 ) && ( ns != globalNs ) )
      {
        ns = null;
      }

      nsPtrPtr[0] = ns;
      altNsPtrPtr[0] = altNs;
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * Tcl_FindNamespace -> findNamespace
    *
    *	Searches for a namespace.
    *
    * Results:T
    *	Returns a reference to the namespace if it is found. Otherwise,
    *	returns null and leaves an error message in the interpreter's
    *	result object if "flags" contains TCL.VarFlag.LEAVE_ERR_MSG.
    *
    * Side effects:
    *	None.
    *
    *----------------------------------------------------------------------
    */

    internal static Namespace findNamespace( Interp interp, string name, Namespace contextNs, TCL.VarFlag flags )
    {
      Namespace ns;

      // Java does not support passing an address so we pass
      // an array of size 1 and then assign arr[0] to the value
      Namespace[] nsArr = new Namespace[1];
      Namespace[] dummy1Arr = new Namespace[1];
      string[] dummy2Arr = new string[1];

      // Find the namespace(s) that contain the specified namespace name.
      // Add the TCL.VarFlag.FIND_ONLY_NS flag to resolve the name all the way down
      // to its last component, a namespace.

      getNamespaceForQualName( interp, name, contextNs, ( flags | TCL.VarFlag.FIND_ONLY_NS ), nsArr, dummy1Arr, dummy1Arr, dummy2Arr );


      // Get the values out of the arrays!
      ns = nsArr[0];

      if ( ns != null )
      {
        return ns;
      }
      else if ( ( flags & TCL.VarFlag.LEAVE_ERR_MSG ) != 0 )
      {
        /*
        interp.resetResult();
        TclString.append(interp.getResult(), "unknown namespace \"" + name + "\"");
        */

        // FIXME : is there a test case for this error?
        interp.setResult( "unknown namespace \"" + name + "\"" );
      }
      return null;
    }



    /*
    *----------------------------------------------------------------------
    *
    * Tcl_FindCommand -> findCommand
    *
    *	Searches for a command.
    *
    * Results:
    *	Returns a token for the command if it is found. Otherwise, if it
    *	can't be found or there is an error, returns null and leaves an
    *	error message in the interpreter's result object if "flags"
    *	contains TCL.VarFlag.LEAVE_ERR_MSG.
    *
    * Side effects:
    *	None.
    *
    *----------------------------------------------------------------------
    */

    internal static WrappedCommand findCommand( Interp interp, string name, Namespace contextNs, TCL.VarFlag flags )
    {
      Interp.ResolverScheme res;
      Namespace cxtNs;
      Namespace[] ns = new Namespace[2];
      string simpleName;
      int search;
      //int result;
      WrappedCommand cmd;

      // If this namespace has a command resolver, then give it first
      // crack at the command resolution.  If the interpreter has any
      // command resolvers, consult them next.  The command resolver
      // procedures may return a Tcl_Command value, they may signal
      // to continue onward, or they may signal an error.

      if ( ( flags & TCL.VarFlag.GLOBAL_ONLY ) != 0 )
      {
        cxtNs = getGlobalNamespace( interp );
      }
      else if ( contextNs != null )
      {
        cxtNs = contextNs;
      }
      else
      {
        cxtNs = getCurrentNamespace( interp );
      }

      if ( cxtNs.resolver != null || interp.resolvers != null )
      {
        try
        {
          if ( cxtNs.resolver != null )
          {
            cmd = cxtNs.resolver.resolveCmd( interp, name, cxtNs, flags );
          }
          else
          {
            cmd = null;
          }

          if ( cmd == null && interp.resolvers != null )
          {
            IEnumerator enum_Renamed = interp.resolvers.GetEnumerator();
            while ( cmd == null && enum_Renamed.MoveNext() )
            {
              res = (Interp.ResolverScheme)enum_Renamed.Current;
              cmd = res.resolver.resolveCmd( interp, name, cxtNs, flags );
            }
          }

          if ( cmd != null )
          {
            return cmd;
          }
        }
        catch ( TclException e )
        {
          return null;
        }
      }

      // Java does not support passing an address so we pass
      // an array of size 1 and then assign arr[0] to the value
      Namespace[] ns0Arr = new Namespace[1];
      Namespace[] ns1Arr = new Namespace[1];
      Namespace[] cxtNsArr = new Namespace[1];
      string[] simpleNameArr = new string[1];


      // Find the namespace(s) that contain the command.

      getNamespaceForQualName( interp, name, contextNs, flags, ns0Arr, ns1Arr, cxtNsArr, simpleNameArr );

      // Get the values out of the arrays!
      ns[0] = ns0Arr[0];
      ns[1] = ns1Arr[0];
      cxtNs = cxtNsArr[0];
      simpleName = simpleNameArr[0];



      // Look for the command in the command table of its namespace.
      // Be sure to check both possible search paths: from the specified
      // namespace context and from the global namespace.

      cmd = null;
      for ( search = 0; ( search < 2 ) && ( cmd == null ); search++ )
      {
        if ( ( ns[search] != null ) && ( (System.Object)simpleName != null ) )
        {
          cmd = (WrappedCommand)ns[search].cmdTable[simpleName];
        }
      }
      if ( cmd != null )
      {
        return cmd;
      }
      else if ( ( flags & TCL.VarFlag.LEAVE_ERR_MSG ) != 0 )
      {
        throw new TclException( interp, "unknown command \"" + name + "\"" );
      }

      return null;
    }



    /*
    *----------------------------------------------------------------------
    *
    * Tcl_FindNamespaceVar -> findNamespaceVar
    *
    *	Searches for a namespace variable, a variable not local to a
    *	procedure. The variable can be either a scalar or an array, but
    *	may not be an element of an array.
    *
    * Results:
    *	Returns a token for the variable if it is found. Otherwise, if it
    *	can't be found or there is an error, returns null and leaves an
    *	error message in the interpreter's result object if "flags"
    *	contains TCL.VarFlag.LEAVE_ERR_MSG.
    *
    * Side effects:
    *	None.
    *
    *----------------------------------------------------------------------
    */

    internal static Var findNamespaceVar( Interp interp, string name, Namespace contextNs, TCL.VarFlag flags )
    {
      Interp.ResolverScheme res;
      Namespace cxtNs;
      Namespace[] ns = new Namespace[2];
      string simpleName;
      int search;
      //int result;
      Var var;

      // If this namespace has a variable resolver, then give it first
      // crack at the variable resolution.  It may return a Tcl_Var
      // value, it may signal to continue onward, or it may signal
      // an error.

      if ( ( flags & TCL.VarFlag.GLOBAL_ONLY ) != 0 )
      {
        cxtNs = getGlobalNamespace( interp );
      }
      else if ( contextNs != null )
      {
        cxtNs = contextNs;
      }
      else
      {
        cxtNs = getCurrentNamespace( interp );
      }

      if ( cxtNs.resolver != null || interp.resolvers != null )
      {
        try
        {
          if ( cxtNs.resolver != null )
          {
            var = cxtNs.resolver.resolveVar( interp, name, cxtNs, flags );
          }
          else
          {
            var = null;
          }

          if ( var == null && interp.resolvers != null )
          {
            IEnumerator enum_Renamed = interp.resolvers.GetEnumerator();
            while ( var == null && enum_Renamed.MoveNext() )
            {
              res = (Interp.ResolverScheme)enum_Renamed.Current;
              var = res.resolver.resolveVar( interp, name, cxtNs, flags );
            }
          }

          if ( var != null )
          {
            return var;
          }
        }
        catch ( TclException e )
        {
          return null;
        }
      }

      // Java does not support passing an address so we pass
      // an array of size 1 and then assign arr[0] to the value
      Namespace[] ns0Arr = new Namespace[1];
      Namespace[] ns1Arr = new Namespace[1];
      Namespace[] cxtNsArr = new Namespace[1];
      string[] simpleNameArr = new string[1];


      // Find the namespace(s) that contain the variable.

      getNamespaceForQualName( interp, name, contextNs, flags, ns0Arr, ns1Arr, cxtNsArr, simpleNameArr );

      // Get the values out of the arrays!
      ns[0] = ns0Arr[0];
      ns[1] = ns1Arr[0];
      cxtNs = cxtNsArr[0];
      simpleName = simpleNameArr[0];


      // Look for the variable in the variable table of its namespace.
      // Be sure to check both possible search paths: from the specified
      // namespace context and from the global namespace.

      var = null;
      for ( search = 0; ( search < 2 ) && ( var == null ); search++ )
      {
        if ( ( ns[search] != null ) && ( (System.Object)simpleName != null ) )
        {
          var = (Var)ns[search].varTable[simpleName];
        }
      }
      if ( var != null )
      {
        return var;
      }
      else if ( ( flags & TCL.VarFlag.LEAVE_ERR_MSG ) != 0 )
      {
        /*
        interp.resetResult();
        TclString.append(interp.getResult(), "unknown variable \"" + name + "\"");
        */

        // FIXME : is there a test case for this error?
        interp.setResult( "unknown variable \"" + name + "\"" );
      }
      return null;
    }

    /*
    *----------------------------------------------------------------------
    *
    * GetNamespaceFromObj -> getNamespaceFromObj
    *
    *	Returns the namespace specified by the name in a TclObject.
    *
    * Results:
    *  This method will return the Namespace object whose name
    *  is stored in the obj argument. If the namespace can't be found,
    *  a TclException is raised.
    *
    * Side effects:
    *	May update the internal representation for the object, caching the
    *	namespace reference. The next time this procedure is called, the
    *	namespace value can be found quickly.
    *
    *	If anything goes wrong, an error message is left in the
    *	interpreter's result object.
    *
    *----------------------------------------------------------------------
    */

    internal static Namespace getNamespaceFromObj( Interp interp, TclObject obj )
    {
      ResolvedNsName resName;
      Namespace ns;
      Namespace currNs = getCurrentNamespace( interp );
      int result;

      // Get the internal representation, converting to a namespace type if
      // needed. The internal representation is a ResolvedNsName that points
      // to the actual namespace.

      // FIXME : if NamespaceCmd is not the internal rep this needs to be changed!
      if ( !( obj.InternalRep is NamespaceCmd ) )
      {
        setNsNameFromAny( interp, obj );
      }
      resName = ( (NamespaceCmd)obj.InternalRep ).otherValue;

      // Check the context namespace of the resolved symbol to make sure that
      // it is fresh. If not, then force another conversion to the namespace
      // type, to discard the old rep and create a new one. Note that we
      // verify that the namespace id of the cached namespace is the same as
      // the id when we cached it; this insures that the namespace wasn't
      // deleted and a new one created at the same address.

      ns = null;
      if ( ( resName != null ) && ( resName.refNs == currNs ) && ( resName.nsId == resName.ns.nsId ) )
      {
        ns = resName.ns;
        if ( ( ns.flags & NS_DEAD ) != 0 )
        {
          ns = null;
        }
      }
      if ( ns == null )
      {
        // try again
        setNsNameFromAny( interp, obj );
        resName = ( (NamespaceCmd)obj.InternalRep ).otherValue;
        if ( resName != null )
        {
          ns = resName.ns;
          if ( ( ns.flags & NS_DEAD ) != 0 )
          {
            ns = null;
          }
        }
      }
      return ns;
    }

    /// <summary>----------------------------------------------------------------------
    /// 
    /// Tcl_SetNamespaceResolvers -> setNamespaceResolver
    /// 
    /// Sets the command/variable resolution object for a namespace,
    /// thereby changing the way that command/variable names are
    /// interpreted.  This allows extension writers to support different
    /// name resolution schemes, such as those for object-oriented
    /// packages.
    /// 
    /// Command resolution is handled by the following method:
    /// 
    /// resolveCmd (Interp interp, String name,
    /// NamespaceCmd.Namespace context, int flags)
    /// throws TclException;
    /// 
    /// Whenever a command is executed or NamespaceCmd.findCommand is invoked
    /// within the namespace, this method is called to resolve the
    /// command name.  If this method is able to resolve the name,
    /// it should return the corresponding WrappedCommand.  Otherwise,
    /// the procedure can return null, and the command will
    /// be treated under the usual name resolution rules.  Or, it can
    /// throw a TclException, and the command will be considered invalid.
    /// 
    /// Variable resolution is handled by the following method:
    /// 
    /// resolveVar (Interp interp, String name,
    /// NamespaceCmd.Namespace context, int flags)
    /// throws TclException;
    /// 
    /// If this method is able to resolve the name, it should return
    /// the variable as var object.  The method may also
    /// return null, and the variable will be treated under the usual
    /// name resolution rules.  Or, it can throw a TclException,
    /// and the variable will be considered invalid.
    /// 
    /// Results:
    /// See above.
    /// 
    /// Side effects:
    /// None.
    /// 
    /// ----------------------------------------------------------------------
    /// </summary>

    internal static void setNamespaceResolver( Namespace namespace_Renamed, Resolver resolver )
    // command and variable resolution
    {
      //  Plug in the new command resolver.

      namespace_Renamed.resolver = resolver;
    }

    /// <summary>----------------------------------------------------------------------
    /// 
    /// Tcl_GetNamespaceResolvers -> getNamespaceResolver
    /// 
    /// Returns the current command/variable resolution object
    /// for a namespace.  By default, these objects are null.
    /// New objects can be installed by calling setNamespaceResolver,
    /// to provide new name resolution rules.
    /// 
    /// Results:
    /// Returns the esolver object assigned to this namespace.
    /// Returns null otherwise.
    /// 
    /// Side effects:
    /// None.
    /// 
    /// ----------------------------------------------------------------------
    /// </summary>

    internal static Resolver getNamespaceResolver( Namespace namespace_Renamed )
    // Namespace whose resolution rules
    // are being queried.
    {
      return namespace_Renamed.resolver;
    }

    /*
    *----------------------------------------------------------------------
    *
    * Tcl_NamespaceObjCmd -> cmdProc
    *
    *	Invoked to implement the "namespace" command that creates, deletes,
    *	or manipulates Tcl namespaces. Handles the following syntax:
    *
    *	    namespace children ?name? ?pattern?
    *	    namespace code arg
    *	    namespace current
    *	    namespace delete ?name name...?
    *	    namespace eval name arg ?arg...?
    *	    namespace export ?-clear? ?pattern pattern...?
    *	    namespace forget ?pattern pattern...?
    *	    namespace import ?-force? ?pattern pattern...?
    *	    namespace inscope name arg ?arg...?
    *	    namespace origin name
    *	    namespace parent ?name?
    *	    namespace qualifiers string
    *	    namespace tail string
    *	    namespace which ?-command? ?-variable? name
    *
    * Results:
    *	Returns if the command is successful. Raises Exception if
    *	anything goes wrong.
    *
    * Side effects:
    *	Based on the subcommand name (e.g., "import"), this procedure
    *	dispatches to a corresponding member commands in this class.
    *  This method's side effects depend on whatever that subcommand does.
    *----------------------------------------------------------------------
    */

    private static readonly string[] validCmds = new string[] { "children", "code", "current", "delete", "eval", "export", "forget", "import", "inscope", "origin", "parent", "qualifiers", "tail", "which" };

    private const int OPT_CHILDREN = 0;
    private const int OPT_CODE = 1;
    private const int OPT_CURRENT = 2;
    private const int OPT_DELETE = 3;
    private const int OPT_EVAL = 4;
    private const int OPT_EXPORT = 5;
    private const int OPT_FORGET = 6;
    private const int OPT_IMPORT = 7;
    private const int OPT_INSCOPE = 8;
    private const int OPT_ORIGIN = 9;
    private const int OPT_PARENT = 10;
    private const int OPT_QUALIFIERS = 11;
    private const int OPT_TAIL = 12;
    private const int OPT_WHICH = 13;


    public TCL.CompletionCode cmdProc( Interp interp, TclObject[] objv )
    {

      int i, opt;

      if ( objv.Length < 2 )
      {
        throw new TclNumArgsException( interp, 1, objv, "subcommand ?arg ...?" );
      }

      opt = TclIndex.get( interp, objv[1], validCmds, "option", 0 );

      switch ( opt )
      {

        case OPT_CHILDREN:
          {
            childrenCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_CODE:
          {
            codeCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_CURRENT:
          {
            currentCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_DELETE:
          {
            deleteCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_EVAL:
          {
            evalCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_EXPORT:
          {
            exportCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_FORGET:
          {
            forgetCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_IMPORT:
          {
            importCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_INSCOPE:
          {
            inscopeCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_ORIGIN:
          {
            originCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_PARENT:
          {
            parentCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_QUALIFIERS:
          {
            qualifiersCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_TAIL:
          {
            tailCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }

        case OPT_WHICH:
          {
            whichCmd( interp, objv );
            return TCL.CompletionCode.RETURN;
          }
      } // end switch(opt)
      return TCL.CompletionCode.RETURN;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceChildrenCmd -> childrenCmd
    *
    *	Invoked to implement the "namespace children" command that returns a
    *	list containing the fully-qualified names of the child namespaces of
    *	a given namespace. Handles the following syntax:
    *
    *	    namespace children ?name? ?pattern?
    *
    * Results:
    *  Nothing.
    *
    * Side effects:
    *	Returns a result in the interpreter's result object. If anything
    *	goes wrong, the result is an error message.
    *
    *----------------------------------------------------------------------
    */

    private static void childrenCmd( Interp interp, TclObject[] objv )
    {
      Namespace namespace_Renamed;
      Namespace ns;
      Namespace globalNs = getGlobalNamespace( interp );
      string pattern = null;
      StringBuilder buffer;
      IEnumerator search;
      TclObject list, elem;

      // Get a pointer to the specified namespace, or the current namespace.

      if ( objv.Length == 2 )
      {
        ns = getCurrentNamespace( interp );
      }
      else if ( ( objv.Length == 3 ) || ( objv.Length == 4 ) )
      {
        ns = getNamespaceFromObj( interp, objv[2] );
        if ( ns == null )
        {

          throw new TclException( interp, "unknown namespace \"" + objv[2].ToString() + "\" in namespace children command" );
        }
      }
      else
      {
        throw new TclNumArgsException( interp, 2, objv, "?name? ?pattern?" );
      }

      // Get the glob-style pattern, if any, used to narrow the search.

      buffer = new StringBuilder();
      if ( objv.Length == 4 )
      {

        string name = objv[3].ToString();

        if ( name.StartsWith( "::" ) )
        {
          pattern = name;
        }
        else
        {
          buffer.Append( ns.fullName );
          if ( ns != globalNs )
          {
            buffer.Append( "::" );
          }
          buffer.Append( name );
          pattern = buffer.ToString();
        }
      }

      // Create a list containing the full names of all child namespaces
      // whose names match the specified pattern, if any.

      list = TclList.newInstance();
      foreach ( Namespace childNs in ns.childTable.Values )
      {
        if ( ( (System.Object)pattern == null ) || Util.stringMatch( childNs.fullName, pattern ) )
        {
          elem = TclString.newInstance( childNs.fullName );
          TclList.append( interp, list, elem );
        }
      }
      interp.setResult( list );
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceCodeCmd -> codeCmd
    *
    *	Invoked to implement the "namespace code" command to capture the
    *	namespace context of a command. Handles the following syntax:
    *
    *	    namespace code arg
    *
    *	Here "arg" can be a list. "namespace code arg" produces a result
    *	equivalent to that produced by the command
    *
    *	    list namespace inscope [namespace current] $arg
    *
    *	However, if "arg" is itself a scoped value starting with
    *	"namespace inscope", then the result is just "arg".
    *
    * Results:
    *  Nothing.
    *
    * Side effects:
    *	If anything goes wrong, this procedure returns an error
    *	message as the result in the interpreter's result object.
    *
    *----------------------------------------------------------------------
    */


    private static void codeCmd( Interp interp, TclObject[] objv )
    {
      Namespace currNs;
      TclObject list, obj;
      string arg, p;
      int length;
      int p_ind;

      if ( objv.Length != 3 )
      {
        throw new TclNumArgsException( interp, 2, objv, "arg" );
      }

      // If "arg" is already a scoped value, then return it directly.


      arg = objv[2].ToString();
      length = arg.Length;

      // FIXME : we need a test for this inscope code if there is not one already!
      if ( ( length > 17 ) && ( arg[0] == 'n' ) && arg.StartsWith( "namespace" ) )
      {
        for ( p_ind = 9; ( p_ind < length ) && ( arg[p_ind] == ' ' ); p_ind++ )
        {
          // empty body: skip over spaces
        }
        if ( ( ( length - p_ind ) >= 7 ) && ( arg[p_ind] == 'i' ) && arg.Substring( p_ind ).StartsWith( "inscope" ) )
        {
          interp.setResult( objv[2] );
          return;
        }
      }

      // Otherwise, construct a scoped command by building a list with
      // "namespace inscope", the full name of the current namespace, and 
      // the argument "arg". By constructing a list, we ensure that scoped
      // commands are interpreted properly when they are executed later,
      // by the "namespace inscope" command.

      list = TclList.newInstance();
      TclList.append( interp, list, TclString.newInstance( "namespace" ) );
      TclList.append( interp, list, TclString.newInstance( "inscope" ) );

      currNs = getCurrentNamespace( interp );
      if ( currNs == getGlobalNamespace( interp ) )
      {
        obj = TclString.newInstance( "::" );
      }
      else
      {
        obj = TclString.newInstance( currNs.fullName );
      }

      TclList.append( interp, list, obj );
      TclList.append( interp, list, objv[2] );

      interp.setResult( list );
      return;
    }

    /*
    *----------------------------------------------------------------------
    *
    * NamespaceCurrentCmd -> currentCmd
    *
    *	Invoked to implement the "namespace current" command which returns
    *	the fully-qualified name of the current namespace. Handles the
    *	following syntax:
    *
    *	    namespace current
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Returns a result in the interpreter's result object. If anything
    *	goes wrong, the result is an error message.
    *
    *----------------------------------------------------------------------
    */

    private static void currentCmd( Interp interp, TclObject[] objv )
    {

      Namespace currNs;

      if ( objv.Length != 2 )
      {
        throw new TclNumArgsException( interp, 2, objv, null );
      }

      // The "real" name of the global namespace ("::") is the null string,
      // but we return "::" for it as a convenience to programmers. Note that
      // "" and "::" are treated as synonyms by the namespace code so that it
      // is still easy to do things like:
      //
      //    namespace [namespace current]::bar { ... }

      currNs = getCurrentNamespace( interp );

      if ( currNs == getGlobalNamespace( interp ) )
      {
        // FIXME : appending to te result really screws everything up!
        // need to figure out how to disallow this!
        //TclString.append(interp.getResult(), "::");
        interp.setResult( "::" );
      }
      else
      {
        //TclString.append(interp.getResult(), currNs.fullName);
        interp.setResult( currNs.fullName );
      }
    }

    /*
    *----------------------------------------------------------------------
    *
    * NamespaceDeleteCmd -> deleteCmd
    *
    *	Invoked to implement the "namespace delete" command to delete
    *	namespace(s). Handles the following syntax:
    *
    *	    namespace delete ?name name...?
    *
    *	Each name identifies a namespace. It may include a sequence of
    *	namespace qualifiers separated by "::"s. If a namespace is found, it
    *	is deleted: all variables and procedures contained in that namespace
    *	are deleted. If that namespace is being used on the call stack, it
    *	is kept alive (but logically deleted) until it is removed from the
    *	call stack: that is, it can no longer be referenced by name but any
    *	currently executing procedure that refers to it is allowed to do so
    *	until the procedure returns. If the namespace can't be found, this
    *	procedure returns an error. If no namespaces are specified, this
    *	command does nothing.
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Deletes the specified namespaces. If anything goes wrong, this
    *	procedure returns an error message in the interpreter's
    *	result object.
    *
    *----------------------------------------------------------------------
    */

    private static void deleteCmd( Interp interp, TclObject[] objv )
    {
      Namespace namespace_Renamed;
      string name;
      int i;

      if ( objv.Length < 2 )
      {
        throw new TclNumArgsException( interp, 2, objv, "?name name...?" );
      }

      // Destroying one namespace may cause another to be destroyed. Break
      // this into two passes: first check to make sure that all namespaces on
      // the command line are valid, and report any errors.

      for ( i = 2; i < objv.Length; i++ )
      {

        name = objv[i].ToString();
        namespace_Renamed = findNamespace( interp, name, null, 0 );

        if ( namespace_Renamed == null )
        {

          throw new TclException( interp, "unknown namespace \"" + objv[i].ToString() + "\" in namespace delete command" );
        }
      }

      // Okay, now delete each namespace.

      for ( i = 2; i < objv.Length; i++ )
      {

        name = objv[i].ToString();
        namespace_Renamed = findNamespace( interp, name, null, 0 );

        if ( namespace_Renamed != null )
        {
          deleteNamespace( namespace_Renamed );
        }
      }
    }

    /*
    *----------------------------------------------------------------------
    *
    * NamespaceEvalCmd -> evalCmd
    *
    *	Invoked to implement the "namespace eval" command. Executes
    *	commands in a namespace. If the namespace does not already exist,
    *	it is created. Handles the following syntax:
    *
    *	    namespace eval name arg ?arg...?
    *
    *	If more than one arg argument is specified, the command that is
    *	executed is the result of concatenating the arguments together with
    *	a space between each argument.
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Returns the result of the command in the interpreter's result
    *	object. If anything goes wrong, this procedure returns an error
    *	message as the result.
    *
    *----------------------------------------------------------------------
    */

    private static void evalCmd( Interp interp, TclObject[] objv )
    {
      Namespace namespace_Renamed;
      CallFrame frame;
      string cmd;
      string name;
      int length;

      if ( objv.Length < 4 )
      {
        throw new TclNumArgsException( interp, 2, objv, "name arg ?arg...?" );
      }

      // Try to resolve the namespace reference, caching the result in the
      // namespace object along the way.

      namespace_Renamed = getNamespaceFromObj( interp, objv[2] );

      // If the namespace wasn't found, try to create it.

      if ( namespace_Renamed == null )
      {

        name = objv[2].ToString();
        namespace_Renamed = createNamespace( interp, name, null );
        if ( namespace_Renamed == null )
        {
          // FIXME : result hack, we get the interp result and throw it!

          throw new TclException( interp, interp.getResult().ToString() );
        }
      }

      // Make the specified namespace the current namespace and evaluate
      // the command(s).

      frame = interp.newCallFrame();
      pushCallFrame( interp, frame, namespace_Renamed, false );

      try
      {
        if ( objv.Length == 4 )
        {
          interp.eval( objv[3], 0 );
        }
        else
        {
          cmd = Util.concat( 3, objv.Length, objv );

          // eval() will delete the object when it decrements its
          // refcount after eval'ing it.

          interp.eval( cmd ); // do not pass TCL_EVAL_DIRECT, for compiler only
        }
      }
      catch ( TclException ex )
      {
        if ( ex.getCompletionCode() == TCL.CompletionCode.ERROR )
        {
          interp.addErrorInfo( "\n    (in namespace eval \"" + namespace_Renamed.fullName + "\" script line " + interp.errorLine + ")" );
        }
        throw ex;
      }
      finally
      {
        popCallFrame( interp );
      }

      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceExportCmd -> exportCmd
    *
    *	Invoked to implement the "namespace export" command that specifies
    *	which commands are exported from a namespace. The exported commands
    *	are those that can be imported into another namespace using
    *	"namespace import". Both commands defined in a namespace and
    *	commands the namespace has imported can be exported by a
    *	namespace. This command has the following syntax:
    *
    *	    namespace export ?-clear? ?pattern pattern...?
    *
    *	Each pattern may contain "string match"-style pattern matching
    *	special characters, but the pattern may not include any namespace
    *	qualifiers: that is, the pattern must specify commands in the
    *	current (exporting) namespace. The specified patterns are appended
    *	onto the namespace's list of export patterns.
    *
    *	To reset the namespace's export pattern list, specify the "-clear"
    *	flag.
    *
    *	If there are no export patterns and the "-clear" flag isn't given,
    *	this command returns the namespace's current export list.
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Returns a result in the interpreter's result object. If anything
    *	goes wrong, the result is an error message.
    *
    *----------------------------------------------------------------------
    */


    private static void exportCmd( Interp interp, TclObject[] objv )
    {
      Namespace currNs = getCurrentNamespace( interp );
      string pattern, inString;
      bool resetListFirst = false;
      int firstArg, patternCt, i;

      if ( objv.Length < 2 )
      {
        throw new TclNumArgsException( interp, 2, objv, "?-clear? ?pattern pattern...?" );
      }

      // Process the optional "-clear" argument.

      firstArg = 2;
      if ( firstArg < objv.Length )
      {

        inString = objv[firstArg].ToString();
        if ( inString.Equals( "-clear" ) )
        {
          resetListFirst = true;
          firstArg++;
        }
      }

      // If no pattern arguments are given, and "-clear" isn't specified,
      // return the namespace's current export pattern list.

      patternCt = ( objv.Length - firstArg );
      if ( patternCt == 0 )
      {
        if ( firstArg > 2 )
        {
          return;
        }
        else
        {
          // create list with export patterns
          TclObject list = TclList.newInstance();
          appendExportList( interp, currNs, list );
          interp.setResult( list );
          return;
        }
      }

      // Add each pattern to the namespace's export pattern list.

      for ( i = firstArg; i < objv.Length; i++ )
      {

        pattern = objv[i].ToString();
        exportList( interp, currNs, pattern, ( ( i == firstArg ) ? resetListFirst : false ) );
      }
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceForgetCmd -> forgetCmd
    *
    *	Invoked to implement the "namespace forget" command to remove
    *	imported commands from a namespace. Handles the following syntax:
    *
    *	    namespace forget ?pattern pattern...?
    *
    *	Each pattern is a name like "foo::*" or "a::b::x*". That is, the
    *	pattern may include the special pattern matching characters
    *	recognized by the "string match" command, but only in the command
    *	name at the end of the qualified name; the special pattern
    *	characters may not appear in a namespace name. All of the commands
    *	that match that pattern are checked to see if they have an imported
    *	command in the current namespace that refers to the matched
    *	command. If there is an alias, it is removed.
    *	
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Imported commands are removed from the current namespace. If
    *	anything goes wrong, this procedure returns an error message in the
    *	interpreter's result object.
    *
    *----------------------------------------------------------------------
    */


    private static void forgetCmd( Interp interp, TclObject[] objv )
    {

      string pattern;
      int i;

      if ( objv.Length < 2 )
      {
        throw new TclNumArgsException( interp, 2, objv, "?pattern pattern...?" );
      }

      for ( i = 2; i < objv.Length; i++ )
      {

        pattern = objv[i].ToString();
        forgetImport( interp, null, pattern );
      }
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceImportCmd -> importCmd
    *
    *	Invoked to implement the "namespace import" command that imports
    *	commands into a namespace. Handles the following syntax:
    *
    *	    namespace import ?-force? ?pattern pattern...?
    *
    *	Each pattern is a namespace-qualified name like "foo::*",
    *	"a::b::x*", or "bar::p". That is, the pattern may include the
    *	special pattern matching characters recognized by the "string match"
    *	command, but only in the command name at the end of the qualified
    *	name; the special pattern characters may not appear in a namespace
    *	name. All of the commands that match the pattern and which are
    *	exported from their namespace are made accessible from the current
    *	namespace context. This is done by creating a new "imported command"
    *	in the current namespace that points to the real command in its
    *	original namespace; when the imported command is called, it invokes
    *	the real command.
    *
    *	If an imported command conflicts with an existing command, it is
    *	treated as an error. But if the "-force" option is included, then
    *	existing commands are overwritten by the imported commands.
    *	
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Adds imported commands to the current namespace. If anything goes
    *	wrong, this procedure returns an error message in the interpreter's
    *	result object.
    *
    *----------------------------------------------------------------------
    */


    private static void importCmd( Interp interp, TclObject[] objv )
    {

      bool allowOverwrite = false;
      string inString, pattern;
      int i;
      int firstArg;

      if ( objv.Length < 2 )
      {
        throw new TclNumArgsException( interp, 2, objv, "?-force? ?pattern pattern...?" );
      }

      // Skip over the optional "-force" as the first argument.

      firstArg = 2;
      if ( firstArg < objv.Length )
      {

        inString = objv[firstArg].ToString();
        if ( inString.Equals( "-force" ) )
        {
          allowOverwrite = true;
          firstArg++;
        }
      }

      // Handle the imports for each of the patterns.

      for ( i = firstArg; i < objv.Length; i++ )
      {

        pattern = objv[i].ToString();
        importList( interp, null, pattern, allowOverwrite );
      }
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceInscopeCmd -> inscopeCmd
    *
    *	Invoked to implement the "namespace inscope" command that executes a
    *	script in the context of a particular namespace. This command is not
    *	expected to be used directly by programmers; calls to it are
    *	generated implicitly when programs use "namespace code" commands
    *	to register callback scripts. Handles the following syntax:
    *
    *	    namespace inscope name arg ?arg...?
    *
    *	The "namespace inscope" command is much like the "namespace eval"
    *	command except that it has lappend semantics and the namespace must
    *	already exist. It treats the first argument as a list, and appends
    *	any arguments after the first onto the end as proper list elements.
    *	For example,
    *
    *	    namespace inscope ::foo a b c d
    *
    *	is equivalent to
    *
    *	    namespace eval ::foo [concat a [list b c d]]
    *
    *	This lappend semantics is important because many callback scripts
    *	are actually prefixes.
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Returns a result in the Tcl interpreter's result object.
    *
    *----------------------------------------------------------------------
    */

    private static void inscopeCmd( Interp interp, TclObject[] objv )
    {
      Namespace namespace_Renamed;
      CallFrame frame;
      int i, result;

      if ( objv.Length < 4 )
      {
        throw new TclNumArgsException( interp, 2, objv, "name arg ?arg...?" );
      }

      // Resolve the namespace reference.

      namespace_Renamed = getNamespaceFromObj( interp, objv[2] );
      if ( namespace_Renamed == null )
      {

        throw new TclException( interp, "unknown namespace \"" + objv[2].ToString() + "\" in inscope namespace command" );
      }

      // Make the specified namespace the current namespace.

      frame = interp.newCallFrame();
      pushCallFrame( interp, frame, namespace_Renamed, false );


      // Execute the command. If there is just one argument, just treat it as
      // a script and evaluate it. Otherwise, create a list from the arguments
      // after the first one, then concatenate the first argument and the list
      // of extra arguments to form the command to evaluate.

      try
      {
        if ( objv.Length == 4 )
        {
          interp.eval( objv[3], 0 );
        }
        else
        {
          TclObject[] concatObjv = new TclObject[2];
          TclObject list;
          string cmd;

          list = TclList.newInstance();
          for ( i = 4; i < objv.Length; i++ )
          {
            try
            {
              TclList.append( interp, list, objv[i] );
            }
            catch ( TclException ex )
            {
              list.release(); // free unneeded obj
              throw ex;
            }
          }

          concatObjv[0] = objv[3];
          concatObjv[1] = list;
          cmd = Util.concat( 0, 1, concatObjv );
          interp.eval( cmd ); // do not pass TCL_EVAL_DIRECT, for compiler only
          list.release(); // we're done with the list object
        }
      }
      catch ( TclException ex )
      {
        if ( ex.getCompletionCode() == TCL.CompletionCode.ERROR )
        {
          interp.addErrorInfo( "\n    (in namespace inscope \"" + namespace_Renamed.fullName + "\" script line " + interp.errorLine + ")" );
        }
        throw ex;
      }
      finally
      {
        popCallFrame( interp );
      }

      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceOriginCmd -> originCmd
    *
    *	Invoked to implement the "namespace origin" command to return the
    *	fully-qualified name of the "real" command to which the specified
    *	"imported command" refers. Handles the following syntax:
    *
    *	    namespace origin name
    *
    * Results:
    *	An imported command is created in an namespace when that namespace
    *	imports a command from another namespace. If a command is imported
    *	into a sequence of namespaces a, b,...,n where each successive
    *	namespace just imports the command from the previous namespace, this
    *	command returns the fully-qualified name of the original command in
    *	the first namespace, a. If "name" does not refer to an alias, its
    *	fully-qualified name is returned. The returned name is stored in the
    *	interpreter's result object. This procedure returns TCL_OK if
    *	successful, and TCL_ERROR if anything goes wrong.
    *
    * Side effects:
    *	If anything goes wrong, this procedure returns an error message in
    *	the interpreter's result object.
    *
    *----------------------------------------------------------------------
    */

    private static void originCmd( Interp interp, TclObject[] objv )
    {
      WrappedCommand command, origCommand;

      if ( objv.Length != 3 )
      {
        throw new TclNumArgsException( interp, 2, objv, "name" );
      }

      // FIXME : is this the right way to search for a command?

      //command = Tcl_GetCommandFromObj(interp, objv[2]);

      command = NamespaceCmd.findCommand( interp, objv[2].ToString(), null, 0 );

      if ( command == null )
      {

        throw new TclException( interp, "invalid command name \"" + objv[2].ToString() + "\"" );
      }

      origCommand = getOriginalCommand( command );
      if ( origCommand == null )
      {
        // The specified command isn't an imported command. Return the
        // command's name qualified by the full name of the namespace it
        // was defined in.

        interp.setResult( interp.getCommandFullName( command ) );
      }
      else
      {
        interp.setResult( interp.getCommandFullName( origCommand ) );
      }
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceParentCmd -> parentCmd
    *
    *	Invoked to implement the "namespace parent" command that returns the
    *	fully-qualified name of the parent namespace for a specified
    *	namespace. Handles the following syntax:
    *
    *	    namespace parent ?name?
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Returns a result in the interpreter's result object. If anything
    *	goes wrong, the result is an error message.
    *
    *----------------------------------------------------------------------
    */

    private static void parentCmd( Interp interp, TclObject[] objv )
    {
      Namespace ns;

      if ( objv.Length == 2 )
      {
        ns = getCurrentNamespace( interp );
      }
      else if ( objv.Length == 3 )
      {
        ns = getNamespaceFromObj( interp, objv[2] );
        if ( ns == null )
        {

          throw new TclException( interp, "unknown namespace \"" + objv[2].ToString() + "\" in namespace parent command" );
        }
      }
      else
      {
        throw new TclNumArgsException( interp, 2, objv, "?name?" );
      }

      // Report the parent of the specified namespace.

      if ( ns.parent != null )
      {
        interp.setResult( ns.parent.fullName );
      }
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceQualifiersCmd -> qualifiersCmd
    *
    *	Invoked to implement the "namespace qualifiers" command that returns
    *	any leading namespace qualifiers in a string. These qualifiers are
    *	namespace names separated by "::"s. For example, for "::foo::p" this
    *	command returns "::foo", and for "::" it returns "". This command
    *	is the complement of the "namespace tail" command. Note that this
    *	command does not check whether the "namespace" names are, in fact,
    *	the names of currently defined namespaces. Handles the following
    *	syntax:
    *
    *	    namespace qualifiers string
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Returns a result in the interpreter's result object. If anything
    *	goes wrong, the result is an error message.
    *
    *----------------------------------------------------------------------
    */

    private static void qualifiersCmd( Interp interp, TclObject[] objv )
    {
      string name;
      int p;

      if ( objv.Length != 3 )
      {
        throw new TclNumArgsException( interp, 2, objv, "string" );
      }

      // Find the end of the string, then work backward and find
      // the start of the last "::" qualifier.


      name = objv[2].ToString();
      p = name.Length;

      while ( --p >= 0 )
      {
        if ( ( name[p] == ':' ) && ( p > 0 ) && ( name[p - 1] == ':' ) )
        {
          p -= 2; // back up over the ::
          while ( ( p >= 0 ) && ( name[p] == ':' ) )
          {
            p--; // back up over the preceeding :
          }
          break;
        }
      }

      if ( p >= 0 )
      {
        interp.setResult( name.Substring( 0, ( p + 1 ) - ( 0 ) ) );
      }
      // When no result is set the empty string is the result
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceTailCmd -> tailCmd
    *
    *	Invoked to implement the "namespace tail" command that returns the
    *	trailing name at the end of a string with "::" namespace
    *	qualifiers. These qualifiers are namespace names separated by
    *	"::"s. For example, for "::foo::p" this command returns "p", and for
    *	"::" it returns "". This command is the complement of the "namespace
    *	qualifiers" command. Note that this command does not check whether
    *	the "namespace" names are, in fact, the names of currently defined
    *	namespaces. Handles the following syntax:
    *
    *	    namespace tail string
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Returns a result in the interpreter's result object. If anything
    *	goes wrong, the result is an error message.
    *
    *----------------------------------------------------------------------
    */


    private static void tailCmd( Interp interp, TclObject[] objv )
    {
      string name;
      int p;

      if ( objv.Length != 3 )
      {
        throw new TclNumArgsException( interp, 2, objv, "string" );
      }

      // Find the end of the string, then work backward and find the
      // last "::" qualifier.


      name = objv[2].ToString();
      p = name.Length;

      while ( --p > 0 )
      {
        if ( ( name[p] == ':' ) && ( name[p - 1] == ':' ) )
        {
          p++; // just after the last "::"
          break;
        }
      }

      if ( p >= 0 )
      {
        interp.setResult( name.Substring( p ) );
      }
      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * NamespaceWhichCmd -> whichCmd
    *
    *	Invoked to implement the "namespace which" command that returns the
    *	fully-qualified name of a command or variable. If the specified
    *	command or variable does not exist, it returns "". Handles the
    *	following syntax:
    *
    *	    namespace which ?-command? ?-variable? name
    *
    * Results:
    *  Returns if successful, raises TclException if something goes wrong.
    *
    * Side effects:
    *	Returns a result in the interpreter's result object. If anything
    *	goes wrong, the result is an error message.
    *
    *----------------------------------------------------------------------
    */


    private static void whichCmd( Interp interp, TclObject[] objv )
    {
      string arg;
      WrappedCommand cmd;
      Var variable;
      int argIndex, lookup;

      if ( objv.Length < 3 )
      {
        throw new TclNumArgsException( interp, 2, objv, "?-command? ?-variable? name" );
      }

      // Look for a flag controlling the lookup.

      argIndex = 2;
      lookup = 0; // assume command lookup by default

      arg = objv[2].ToString();
      if ( ( arg.Length > 1 ) && ( arg[0] == '-' ) )
      {
        if ( arg.Equals( "-command" ) )
        {
          lookup = 0;
        }
        else if ( arg.Equals( "-variable" ) )
        {
          lookup = 1;
        }
        else
        {
          throw new TclNumArgsException( interp, 2, objv, "?-command? ?-variable? name" );
        }
        argIndex = 3;
      }
      if ( objv.Length != ( argIndex + 1 ) )
      {
        throw new TclNumArgsException( interp, 2, objv, "?-command? ?-variable? name" );
      }

      // FIXME : check that this implementation works!

      switch ( lookup )
      {

        case 0:

          arg = objv[argIndex].ToString();

          // FIXME : is this the right way to lookup a Command token?
          //cmd = Tcl_GetCommandFromObj(interp, objv[argIndex]);
          cmd = NamespaceCmd.findCommand( interp, arg, null, 0 );

          if ( cmd == null )
          {
            return; // cmd not found, just return (no error)
          }
          interp.setResult( interp.getCommandFullName( cmd ) );
          return;


        case 1:

          arg = objv[argIndex].ToString();
          variable = NamespaceCmd.findNamespaceVar( interp, arg, null, 0 );
          if ( variable != null )
          {
            interp.setResult( Var.getVariableFullName( interp, variable ) );
          }
          return;
      }

      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * FreeNsNameInternalRep -> dispose
    *
    *	Frees the resources associated with a object's internal
    *	representation. See src/tcljava/tcl/lang/InternalRep.java
    *
    * Results:
    *	None.
    *
    * Side effects:
    *	Decrements the ref count of any Namespace structure pointed
    *	to by the nsName's internal representation. If there are no more
    *	references to the namespace, it's structure will be freed.
    *
    *----------------------------------------------------------------------
    */

    public void dispose()
    {
      bool debug;
      System.Diagnostics.Debug.WriteLine( "dispose() called for namespace object " + ( otherValue == null ? null : otherValue.ns ) );

      ResolvedNsName resName = otherValue;
      Namespace ns;

      // Decrement the reference count of the namespace. If there are no
      // more references, free it up.

      if ( resName != null )
      {
        resName.refCount--;
        if ( resName.refCount == 0 )
        {

          // Decrement the reference count for the cached namespace.  If
          // the namespace is dead, and there are no more references to
          // it, free it.

          ns = resName.ns;
          ns.refCount--;
          if ( ( ns.refCount == 0 ) && ( ( ns.flags & NS_DEAD ) != 0 ) )
          {
            free( ns );
          }
          otherValue = null;
        }
      }
    }


    /*
    *----------------------------------------------------------------------
    *
    * DupNsNameInternalRep -> duplicate
    *
    *	Get a copy of this Object for copy-on-write
    *	operations. We just increment its useCount and return the same
    *	ReflectObject because ReflectObject's cannot be modified, so
    *	they don't need copy-on-write protections.
    *
    * Results:
    *	None.
    *
    * Side effects:
    *  None.
    *
    *----------------------------------------------------------------------
    */

    public InternalRep duplicate()
    {
      System.Diagnostics.Debug.WriteLine( "duplicate() called for namespace object " + ( otherValue == null ? null : otherValue.ns ) );

      ResolvedNsName resName = otherValue;

      if ( resName != null )
      {
        resName.refCount++;
      }

      return this;
    }


    /*
    *----------------------------------------------------------------------
    *
    * SetNsNameFromAny -> setNsNameFromAny
    *
    *	Attempt to generate a nsName internal representation for a
    *	TclObject.
    *
    * Results:
    *	Returns if the value could be converted to a proper
    *	namespace reference. Otherwise, raises TclException.
    *
    * Side effects:
    *	If successful, the object is made a nsName object. Its internal rep
    *	is set to point to a ResolvedNsName, which contains a cached pointer
    *	to the Namespace. Reference counts are kept on both the
    *	ResolvedNsName and the Namespace, so we can keep track of their
    *	usage and free them when appropriate.
    *
    *----------------------------------------------------------------------
    */

    private static void setNsNameFromAny( Interp interp, TclObject tobj )
    {
      string name;
      Namespace ns;
      ResolvedNsName resName;

      // Java does not support passing an address so we pass
      // an array of size 1 and then assign arr[0] to the value
      Namespace[] nsArr = new Namespace[1];
      Namespace[] dummy1Arr = new Namespace[1];
      string[] dummy2Arr = new string[1];

      // Get the string representation.

      name = tobj.ToString();

      // Look for the namespace "name" in the current namespace. If there is
      // an error parsing the (possibly qualified) name, return an error.
      // If the namespace isn't found, we convert the object to an nsName
      // object with a null ResolvedNsName internal rep.

      getNamespaceForQualName( interp, name, null, TCL.VarFlag.FIND_ONLY_NS, nsArr, dummy1Arr, dummy1Arr, dummy2Arr );


      // Get the values out of the arrays!
      ns = nsArr[0];

      // If we found a namespace, then create a new ResolvedNsName structure
      // that holds a reference to it.

      if ( ns != null )
      {
        Namespace currNs = getCurrentNamespace( interp );

        ns.refCount++;
        resName = new ResolvedNsName();
        resName.ns = ns;
        resName.nsId = ns.nsId;
        resName.refNs = currNs;
        resName.refCount = 1;
      }
      else
      {
        resName = null;
      }

      // By setting the new internal rep we free up the old one.

      // FIXME : should a NamespaceCmd wrap a ResolvedNsName?
      // this is confusing because it seems like the C code uses
      // a ResolvedNsName like it is the InternalRep.

      NamespaceCmd wrap = new NamespaceCmd();
      wrap.otherValue = resName;
      tobj.InternalRep = wrap;

      return;
    }


    /*
    *----------------------------------------------------------------------
    *
    * UpdateStringOfNsName -> toString
    *
    *	Return the string representation for a nsName object.
    *  This method is called only by TclObject.toString()
    *  when TclObject.stringRep is null.
    *
    * Results:
    *	None.
    *
    * Side effects:
    *   None.
    *
    *----------------------------------------------------------------------
    */

    public override string ToString()
    {
      bool debug;

      System.Diagnostics.Debug.WriteLine( "toString() called for namespace object " + ( otherValue == null ? null : otherValue.ns ) );

      ResolvedNsName resName = otherValue;
      Namespace ns;
      string name = "";

      if ( ( resName != null ) && ( resName.nsId == resName.ns.nsId ) )
      {
        ns = resName.ns;
        if ( ( ns.flags & NS_DEAD ) != 0 )
        {
          ns = null;
        }
        if ( ns != null )
        {
          name = ns.fullName;
        }
      }

      return name;
    }


    // This interface is used to provide a callback when a namespace is deleted
    // (ported Tcl_NamespaceDeleteProc to NamespaceCmd.DeleteProc)

    internal interface DeleteProc
    {
      void delete();
    }


    // This structure contains a cached pointer to a namespace that is the
    // result of resolving the namespace's name in some other namespace. It is
    // the internal representation for a nsName object. It contains the
    // pointer along with some information that is used to check the cached
    // pointer's validity. (ported Tcl_Namespace to NamespaceCmd.Namespace)

    public class Namespace
    {
      internal string name; // The namespace's simple (unqualified)
      // name. This contains no ::'s. The name of
      // the global namespace is "" although "::"
      // is an synonym.

      internal string fullName; // The namespace's fully qualified name.
      // This starts with ::.

      internal DeleteProc deleteProc; // method to invoke when namespace is deleted

      internal Namespace parent; // reference to the namespace that contains
      // this one. null is this is the global namespace.

      internal Hashtable childTable; // Contains any child namespaces. Indexed
      // by strings; values are references to
      // Namespace objects

      internal long nsId; // Unique id for the namespace.
      internal Interp interp; // The interpreter containing this namespace.

      internal int flags; // OR-ed combination of the namespace
      // status flags NS_DYING and NS_DEAD (listed below)

      internal int activationCount; // Number of "activations" or active call
      // frames for this namespace that are on
      // the Tcl call stack. The namespace won't
      // be freed until activationCount becomes zero.

      internal int refCount; // Count of references by nsName
      // objects. The namespace can't be freed
      // until refCount becomes zero.

      internal Hashtable cmdTable; // Contains all the commands currently
      // registered in the namespace. Indexed by
      // strings; values have type (WrappedCommand).
      // Commands imported by Tcl_Import have
      // Command structures that point (via an
      // ImportedCmdRef structure) to the
      // Command structure in the source
      // namespace's command table.

      internal Hashtable varTable; // Contains all the (global) variables
      // currently in this namespace. Indexed
      // by strings; values have type (Var).

      internal string[] exportArray; // Reference to an array of string patterns
      // specifying which commands are exported.
      // A pattern may include "string match"
      // style wildcard characters to specify
      // multiple commands; however, no namespace
      // qualifiers are allowed. null if no
      // export patterns are registered.

      internal int numExportPatterns; // Number of export patterns currently
      // registered using "namespace export".

      internal int maxExportPatterns; // Mumber of export patterns for which
      // space is currently allocated.


      internal Resolver resolver;
      // If non-null, this object overrides the
      // usual command and variable resolution
      // mechanism in Tcl. This procedure is invoked
      // within findCommand and findNamespaceVar to
      // resolve all command and variable references
      // within the namespace.

      // When printing out a Namespace use the full namespace name string

      public override string ToString()
      {
        return fullName;
      }
    }


    // (ported ResolvedNsName to NamespaceCmd.ResolvedNsName)

    internal class ResolvedNsName
    {
      internal Namespace ns; // reference to namespace object
      internal long nsId; // sPtr's unique namespace id. Used to
      // verify that ns is still valid
      // (e.g., it's possible that the namespace
      // was deleted and a new one created at
      // the same address).

      internal Namespace refNs; // reference to the namespace containing the
      // reference (not the namespace that
      // contains the referenced namespace).
      internal int refCount; // Reference count: 1 for each nsName
      // object that has a pointer to this
      // ResolvedNsName structure as its internal
      // rep. This structure can be freed when
      // refCount becomes zero.
    }
    static NamespaceCmd()
    {
      nsMutex = new System.Object();
    }
  }
}
Back to Top