aboutsummaryrefslogblamecommitdiffstats
path: root/infrastructure/rhino1_7R1/src/org/mozilla/javascript/regexp/NativeRegExp.java
blob: a893841fad05c66db95b42bc7fca854e804fe40c (plain) (tree)
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





























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Rhino code, released
 * May 6, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1997-1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Norris Boyd
 *   Igor Bukanov
 *   Brendan Eich
 *   Matthias Radestock
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License Version 2 or later (the "GPL"), in which
 * case the provisions of the GPL are applicable instead of those above. If
 * you wish to allow use of your version of this file only under the terms of
 * the GPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replacing
 * them with the notice and other provisions required by the GPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 *
 * ***** END LICENSE BLOCK ***** */

package org.mozilla.javascript.regexp;

import java.io.Serializable;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.IdFunctionObject;
import org.mozilla.javascript.IdScriptableObject;
import org.mozilla.javascript.Kit;
import org.mozilla.javascript.ScriptRuntime;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.Undefined;

/**
 * This class implements the RegExp native object.
 *
 * Revision History:
 * Implementation in C by Brendan Eich
 * Initial port to Java by Norris Boyd from jsregexp.c version 1.36
 * Merged up to version 1.38, which included Unicode support.
 * Merged bug fixes in version 1.39.
 * Merged JSFUN13_BRANCH changes up to 1.32.2.13
 *
 * @author Brendan Eich
 * @author Norris Boyd
 */



public class NativeRegExp extends IdScriptableObject implements Function
{
    static final long serialVersionUID = 4965263491464903264L;

    private static final Object REGEXP_TAG = new Object();

    public static final int JSREG_GLOB = 0x1;       // 'g' flag: global
    public static final int JSREG_FOLD = 0x2;       // 'i' flag: fold
    public static final int JSREG_MULTILINE = 0x4;  // 'm' flag: multiline

    //type of match to perform
    public static final int TEST = 0;
    public static final int MATCH = 1;
    public static final int PREFIX = 2;

    private static final boolean debug = false;

    private static final byte REOP_EMPTY         = 0;  /* match rest of input against rest of r.e. */
    private static final byte REOP_ALT           = 1;  /* alternative subexpressions in kid and next */
    private static final byte REOP_BOL           = 2;  /* beginning of input (or line if multiline) */
    private static final byte REOP_EOL           = 3;  /* end of input (or line if multiline) */
    private static final byte REOP_WBDRY         = 4;  /* match "" at word boundary */
    private static final byte REOP_WNONBDRY      = 5;  /* match "" at word non-boundary */
    private static final byte REOP_QUANT         = 6;  /* quantified atom: atom{1,2} */
    private static final byte REOP_STAR          = 7;  /* zero or more occurrences of kid */
    private static final byte REOP_PLUS          = 8;  /* one or more occurrences of kid */
    private static final byte REOP_OPT           = 9;  /* optional subexpression in kid */
    private static final byte REOP_LPAREN        = 10; /* left paren bytecode: kid is u.num'th sub-regexp */
    private static final byte REOP_RPAREN        = 11; /* right paren bytecode */
    private static final byte REOP_DOT           = 12; /* stands for any character */
//    private static final byte REOP_CCLASS        = 13; /* character class: [a-f] */
    private static final byte REOP_DIGIT         = 14; /* match a digit char: [0-9] */
    private static final byte REOP_NONDIGIT      = 15; /* match a non-digit char: [^0-9] */
    private static final byte REOP_ALNUM         = 16; /* match an alphanumeric char: [0-9a-z_A-Z] */
    private static final byte REOP_NONALNUM      = 17; /* match a non-alphanumeric char: [^0-9a-z_A-Z] */
    private static final byte REOP_SPACE         = 18; /* match a whitespace char */
    private static final byte REOP_NONSPACE      = 19; /* match a non-whitespace char */
    private static final byte REOP_BACKREF       = 20; /* back-reference (e.g., \1) to a parenthetical */
    private static final byte REOP_FLAT          = 21; /* match a flat string */
    private static final byte REOP_FLAT1         = 22; /* match a single char */
    private static final byte REOP_JUMP          = 23; /* for deoptimized closure loops */
//    private static final byte REOP_DOTSTAR       = 24; /* optimize .* to use a single opcode */
//    private static final byte REOP_ANCHOR        = 25; /* like .* but skips left context to unanchored r.e. */
//    private static final byte REOP_EOLONLY       = 26; /* $ not preceded by any pattern */
//    private static final byte REOP_UCFLAT        = 27; /* flat Unicode string; len immediate counts chars */
    private static final byte REOP_UCFLAT1       = 28; /* single Unicode char */
//    private static final byte REOP_UCCLASS       = 29; /* Unicode character class, vector of chars to match */
//    private static final byte REOP_NUCCLASS      = 30; /* negated Unicode character class */
//    private static final byte REOP_BACKREFi      = 31; /* case-independent REOP_BACKREF */
    private static final byte REOP_FLATi         = 32; /* case-independent REOP_FLAT */
    private static final byte REOP_FLAT1i        = 33; /* case-independent REOP_FLAT1 */
//    private static final byte REOP_UCFLATi       = 34; /* case-independent REOP_UCFLAT */
    private static final byte REOP_UCFLAT1i      = 35; /* case-independent REOP_UCFLAT1 */
//    private static final byte REOP_ANCHOR1       = 36; /* first-char discriminating REOP_ANCHOR */
//    private static final byte REOP_NCCLASS       = 37; /* negated 8-bit character class */
//    private static final byte REOP_DOTSTARMIN    = 38; /* ungreedy version of REOP_DOTSTAR */
//    private static final byte REOP_LPARENNON     = 39; /* non-capturing version of REOP_LPAREN */
//    private static final byte REOP_RPARENNON     = 40; /* non-capturing version of REOP_RPAREN */
    private static final byte REOP_ASSERT        = 41; /* zero width positive lookahead assertion */
    private static final byte REOP_ASSERT_NOT    = 42; /* zero width negative lookahead assertion */
    private static final byte REOP_ASSERTTEST    = 43; /* sentinel at end of assertion child */
    private static final byte REOP_ASSERTNOTTEST = 44; /* sentinel at end of !assertion child */
    private static final byte REOP_MINIMALSTAR   = 45; /* non-greedy version of * */
    private static final byte REOP_MINIMALPLUS   = 46; /* non-greedy version of + */
    private static final byte REOP_MINIMALOPT    = 47; /* non-greedy version of ? */
    private static final byte REOP_MINIMALQUANT  = 48; /* non-greedy version of {} */
    private static final byte REOP_ENDCHILD      = 49; /* sentinel at end of quantifier child */
    private static final byte REOP_CLASS         = 50; /* character class with index */
    private static final byte REOP_REPEAT        = 51; /* directs execution of greedy quantifier */
    private static final byte REOP_MINIMALREPEAT = 52; /* directs execution of non-greedy quantifier */
    private static final byte REOP_END           = 53;
     


    public static void init(Context cx, Scriptable scope, boolean sealed)
    {

        NativeRegExp proto = new NativeRegExp();
        proto.re = (RECompiled)compileRE(cx, "", null, false);
        proto.activatePrototypeMap(MAX_PROTOTYPE_ID);
        proto.setParentScope(scope);
        proto.setPrototype(getObjectPrototype(scope));

        NativeRegExpCtor ctor = new NativeRegExpCtor();
        // Bug #324006: ECMA-262 15.10.6.1 says "The initial value of
        // RegExp.prototype.constructor is the builtin RegExp constructor." 
        proto.put("constructor", proto, ctor);

        ScriptRuntime.setFunctionProtoAndParent(ctor, scope);

        ctor.setImmunePrototypeProperty(proto);

        if (sealed) {
            proto.sealObject();
            ctor.sealObject();
        }

        defineProperty(scope, "RegExp", ctor, ScriptableObject.DONTENUM);
    }

    NativeRegExp(Scriptable scope, Object regexpCompiled)
    {
        this.re = (RECompiled)regexpCompiled;
        this.lastIndex = 0;
        ScriptRuntime.setObjectProtoAndParent(this, scope);
    }

    public String getClassName()
    {
        return "RegExp";
    }

    public Object call(Context cx, Scriptable scope, Scriptable thisObj,
                       Object[] args)
    {
        return execSub(cx, scope, args, MATCH);
    }

    public Scriptable construct(Context cx, Scriptable scope, Object[] args)
    {
        return (Scriptable)execSub(cx, scope, args, MATCH);
    }

    Scriptable compile(Context cx, Scriptable scope, Object[] args)
    {
        if (args.length > 0 && args[0] instanceof NativeRegExp) {
            if (args.length > 1 && args[1] != Undefined.instance) {
                // report error
                throw ScriptRuntime.typeError0("msg.bad.regexp.compile");
            }
            NativeRegExp thatObj = (NativeRegExp) args[0];
            this.re = thatObj.re;
            this.lastIndex = thatObj.lastIndex;
            return this;
        }
        String s = args.length == 0 ? "" : ScriptRuntime.toString(args[0]);
        String global = args.length > 1 && args[1] != Undefined.instance
            ? ScriptRuntime.toString(args[1])
            : null;
        this.re = (RECompiled)compileRE(cx, s, global, false);
        this.lastIndex = 0;
        return this;
    }

    public String toString()
    {
        StringBuffer buf = new StringBuffer();
        buf.append('/');
        if (re.source.length != 0) {
            buf.append(re.source);
        } else {
            // See bugzilla 226045
            buf.append("(?:)");
        }
        buf.append('/');
        if ((re.flags & JSREG_GLOB) != 0)
            buf.append('g');
        if ((re.flags & JSREG_FOLD) != 0)
            buf.append('i');
        if ((re.flags & JSREG_MULTILINE) != 0)
            buf.append('m');
        return buf.toString();
    }

    NativeRegExp() {  }

    private static RegExpImpl getImpl(Context cx)
    {
        return (RegExpImpl) ScriptRuntime.getRegExpProxy(cx);
    }

    private Object execSub(Context cx, Scriptable scopeObj,
                           Object[] args, int matchType)
    {
        RegExpImpl reImpl = getImpl(cx);
        String str;
        if (args.length == 0) {
            str = reImpl.input;
            if (str == null) {
                reportError("msg.no.re.input.for", toString());
            }
        } else {
            str = ScriptRuntime.toString(args[0]);
        }
        double d = ((re.flags & JSREG_GLOB) != 0) ? lastIndex : 0;

        Object rval;
        if (d < 0 || str.length() < d) {
            lastIndex = 0;
            rval = null;
        }
        else {
            int indexp[] = { (int)d };
            rval = executeRegExp(cx, scopeObj, reImpl, str, indexp, matchType);
            if ((re.flags & JSREG_GLOB) != 0) {
                lastIndex = (rval == null || rval == Undefined.instance)
                            ? 0 : indexp[0];
            }
        }
        return rval;
    }

    static Object compileRE(Context cx, String str, String global, boolean flat)
    {
        RECompiled regexp = new RECompiled();
        regexp.source = str.toCharArray();
        int length = str.length();

        int flags = 0;
        if (global != null) {
            for (int i = 0; i < global.length(); i++) {
                char c = global.charAt(i);
                if (c == 'g') {
                    flags |= JSREG_GLOB;
                } else if (c == 'i') {
                    flags |= JSREG_FOLD;
                } else if (c == 'm') {
                    flags |= JSREG_MULTILINE;
                } else {
                    reportError("msg.invalid.re.flag", String.valueOf(c));
                }
            }
        }
        regexp.flags = flags;

        CompilerState state = new CompilerState(cx, regexp.source, length, flags);
        if (flat && length > 0) {
if (debug) {
System.out.println("flat = \"" + str + "\"");
}
            state.result = new RENode(REOP_FLAT);
            state.result.chr = state.cpbegin[0];
            state.result.length = length;
            state.result.flatIndex = 0;
            state.progLength += 5;
        }
        else
            if (!parseDisjunction(state))
                return null;

        regexp.program = new byte[state.progLength + 1];
        if (state.classCount != 0) {
            regexp.classList = new RECharSet[state.classCount];
            regexp.classCount = state.classCount;
        }
        int endPC = emitREBytecode(state, regexp, 0, state.result);
        regexp.program[endPC++] = REOP_END;

if (debug) {
System.out.println("Prog. length = " + endPC);
for (int i = 0; i < endPC; i++) {
    System.out.print(regexp.program[i]);
    if (i < (endPC - 1)) System.out.print(", ");
}
System.out.println();
}
        regexp.parenCount = state.parenCount;

        // If re starts with literal, init anchorCh accordingly
        switch (regexp.program[0]) {
        case REOP_UCFLAT1:
        case REOP_UCFLAT1i:
            regexp.anchorCh = (char)getIndex(regexp.program, 1);
            break;
        case REOP_FLAT1:
        case REOP_FLAT1i:
            regexp.anchorCh = (char)(regexp.program[1] & 0xFF);
            break;
        case REOP_FLAT:
        case REOP_FLATi:
            int k = getIndex(regexp.program, 1);
            regexp.anchorCh = regexp.source[k];
            break;
        }

if (debug) {
if (regexp.anchorCh >= 0) {
    System.out.println("Anchor ch = '" + (char)regexp.anchorCh + "'");
}
}
        return regexp;
    }

    static boolean isDigit(char c)
    {
        return '0' <= c && c <= '9';
    }

    private static boolean isWord(char c)
    {
        return Character.isLetter(c) || isDigit(c) || c == '_';
    }

    private static boolean isLineTerm(char c)
    {
        return ScriptRuntime.isJSLineTerminator(c);
    }

    private static boolean isREWhiteSpace(int c)
    {
        return (c == '\u0020' || c == '\u0009'
                || c == '\n' || c == '\r'
                || c == 0x2028 || c == 0x2029
                || c == '\u000C' || c == '\u000B'
                || c == '\u00A0'
                || Character.getType((char)c) == Character.SPACE_SEPARATOR);
    }

    /*
     *
     * 1. If IgnoreCase is false, return ch.
     * 2. Let u be ch converted to upper case as if by calling
     *    String.prototype.toUpperCase on the one-character string ch.
     * 3. If u does not consist of a single character, return ch.
     * 4. Let cu be u's character.
     * 5. If ch's code point value is greater than or equal to decimal 128 and cu's
     *    code point value is less than decimal 128, then return ch.
     * 6. Return cu.
     */
    private static char upcase(char ch)
    {
        if (ch < 128) {
            if ('a' <= ch && ch <= 'z') {
                return (char)(ch + ('A' - 'a'));
            }
            return ch;
        }
        char cu = Character.toUpperCase(ch);
        if ((ch >= 128) && (cu < 128)) return ch;
        return cu;
    }

    private static char downcase(char ch)
    {
        if (ch < 128) {
            if ('A' <= ch && ch <= 'Z') {
                return (char)(ch + ('a' - 'A'));
            }
            return ch;
        }
        char cl = Character.toLowerCase(ch);
        if ((ch >= 128) && (cl < 128)) return ch;
        return cl;
    }

/*
 * Validates and converts hex ascii value.
 */
    private static int toASCIIHexDigit(int c)
    {
        if (c < '0')
            return -1;
        if (c <= '9') {
            return c - '0';
        }
        c |= 0x20;
        if ('a' <= c && c <= 'f') {
            return c - 'a' + 10;
        }
        return -1;
    }

/*
 * Top-down regular expression grammar, based closely on Perl4.
 *
 *  regexp:     altern                  A regular expression is one or more
 *              altern '|' regexp       alternatives separated by vertical bar.
 */
    private static boolean parseDisjunction(CompilerState state)
    {
        if (!parseAlternative(state))
            return false;
        char[] source = state.cpbegin;
        int index = state.cp;
        if (index != source.length && source[index] == '|') {
            RENode altResult;
            ++state.cp;
            altResult = new RENode(REOP_ALT);
            altResult.kid = state.result;
            if (!parseDisjunction(state))
                return false;
            altResult.kid2 = state.result;
            state.result = altResult;
            /* ALT, <next>, ..., JUMP, <end> ... JUMP <end> */
            state.progLength += 9;
        }
        return true;
    }

/*
 *  altern:     item                    An alternative is one or more items,
 *              item altern             concatenated together.
 */
    private static boolean parseAlternative(CompilerState state)
    {
        RENode headTerm = null;
        RENode tailTerm = null;
        char[] source = state.cpbegin;
        while (true) {
            if (state.cp == state.cpend || source[state.cp] == '|'
                || (state.parenNesting != 0 && source[state.cp] == ')'))
            {
                if (headTerm == null) {
                    state.result = new RENode(REOP_EMPTY);
                }
                else
                    state.result = headTerm;
                return true;
            }
            if (!parseTerm(state))
                return false;
            if (headTerm == null)
                headTerm = state.result;
            else {
                if (tailTerm == null) {
                    headTerm.next = state.result;
                    tailTerm = state.result;
                    while (tailTerm.next != null) tailTerm = tailTerm.next;
                }
                else {
                    tailTerm.next = state.result;
                    tailTerm = tailTerm.next;
                    while (tailTerm.next != null) tailTerm = tailTerm.next;
                }
            }
        }
    }

    /* calculate the total size of the bitmap required for a class expression */
    private static boolean
    calculateBitmapSize(CompilerState state, RENode target, char[] src,
                        int index, int end)
    {
        char rangeStart = 0;
        char c;
        int n;
        int nDigits;
        int i;
        int max = 0;
        boolean inRange = false;

        target.bmsize = 0;

        if (index == end)
            return true;

        if (src[index] == '^')
            ++index;

        while (index != end) {
            int localMax = 0;
            nDigits = 2;
            switch (src[index]) {
            case '\\':
                ++index;
                c = src[index++];
                switch (c) {
                case 'b':
                    localMax = 0x8;
                    break;
                case 'f':
                    localMax = 0xC;
                    break;
                case 'n':
                    localMax = 0xA;
                    break;
                case 'r':
                    localMax = 0xD;
                    break;
                case 't':
                    localMax = 0x9;
                    break;
                case 'v':
                    localMax = 0xB;
                    break;
                case 'c':
                    if (((index + 1) < end) && Character.isLetter(src[index + 1]))
                        localMax = (char)(src[index++] & 0x1F);
                    else
                        localMax = '\\';
                    break;
                case 'u':
                    nDigits += 2;
                    // fall thru...
                case 'x':
                    n = 0;
                    for (i = 0; (i < nDigits) && (index < end); i++) {
                        c = src[index++];
                        n = Kit.xDigitToInt(c, n);
                        if (n < 0) {
                            // Back off to accepting the original
                            // '\' as a literal
                            index -= (i + 1);
                            n = '\\';
                            break;
                        }
                    }
                    localMax = n;
                    break;
                case 'd':
                    if (inRange) {
                        reportError("msg.bad.range", "");
                        return false;
                    }
                    localMax = '9';
                    break;
                case 'D':
                case 's':
                case 'S':
                case 'w':
                case 'W':
                    if (inRange) {
                        reportError("msg.bad.range", "");
                        return false;
                    }
                    target.bmsize = 65535;
                    return true;
                case '0':
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                    /*
                     *  This is a non-ECMA extension - decimal escapes (in this
                     *  case, octal!) are supposed to be an error inside class
                     *  ranges, but supported here for backwards compatibility.
                     *
                     */
                    n = (c - '0');
                    c = src[index];
                    if ('0' <= c && c <= '7') {
                        index++;
                        n = 8 * n + (c - '0');
                        c = src[index];
                        if ('0' <= c && c <= '7') {
                            index++;
                            i = 8 * n + (c - '0');
                            if (i <= 0377)
                                n = i;
                            else
                                index--;
                        }
                    }
                    localMax = n;
                    break;

                default:
                    localMax = c;
                    break;
                }
                break;
            default:
                localMax = src[index++];
                break;
            }
            if (inRange) {
                if (rangeStart > localMax) {
                    reportError("msg.bad.range", "");
                    return false;
                }
                inRange = false;
            }
            else {
                if (index < (end - 1)) {
                    if (src[index] == '-') {
                        ++index;
                        inRange = true;
                        rangeStart = (char)localMax;
                        continue;
                    }
                }
            }
            if ((state.flags & JSREG_FOLD) != 0){
                char cu = upcase((char)localMax);
                char cd = downcase((char)localMax);
                localMax = (cu >= cd) ? cu : cd;
            }
            if (localMax > max)
                max = localMax;
        }
        target.bmsize = max;
        return true;
    }

    /*
     *  item:       assertion               An item is either an assertion or
     *              quantatom               a quantified atom.
     *
     *  assertion:  '^'                     Assertions match beginning of string
     *                                      (or line if the class static property
     *                                      RegExp.multiline is true).
     *              '$'                     End of string (or line if the class
     *                                      static property RegExp.multiline is
     *                                      true).
     *              '\b'                    Word boundary (between \w and \W).
     *              '\B'                    Word non-boundary.
     *
     *  quantatom:  atom                    An unquantified atom.
     *              quantatom '{' n ',' m '}'
     *                                      Atom must occur between n and m times.
     *              quantatom '{' n ',' '}' Atom must occur at least n times.
     *              quantatom '{' n '}'     Atom must occur exactly n times.
     *              quantatom '*'           Zero or more times (same as {0,}).
     *              quantatom '+'           One or more times (same as {1,}).
     *              quantatom '?'           Zero or one time (same as {0,1}).
     *
     *              any of which can be optionally followed by '?' for ungreedy
     *
     *  atom:       '(' regexp ')'          A parenthesized regexp (what matched
     *                                      can be addressed using a backreference,
     *                                      see '\' n below).
     *              '.'                     Matches any char except '\n'.
     *              '[' classlist ']'       A character class.
     *              '[' '^' classlist ']'   A negated character class.
     *              '\f'                    Form Feed.
     *              '\n'                    Newline (Line Feed).
     *              '\r'                    Carriage Return.
     *              '\t'                    Horizontal Tab.
     *              '\v'                    Vertical Tab.
     *              '\d'                    A digit (same as [0-9]).
     *              '\D'                    A non-digit.
     *              '\w'                    A word character, [0-9a-z_A-Z].
     *              '\W'                    A non-word character.
     *              '\s'                    A whitespace character, [ \b\f\n\r\t\v].
     *              '\S'                    A non-whitespace character.
     *              '\' n                   A backreference to the nth (n decimal
     *                                      and positive) parenthesized expression.
     *              '\' octal               An octal escape sequence (octal must be
     *                                      two or three digits long, unless it is
     *                                      0 for the null character).
     *              '\x' hex                A hex escape (hex must be two digits).
     *              '\c' ctrl               A control character, ctrl is a letter.
     *              '\' literalatomchar     Any character except one of the above
     *                                      that follow '\' in an atom.
     *              otheratomchar           Any character not first among the other
     *                                      atom right-hand sides.
     */

    private static void doFlat(CompilerState state, char c)
    {
        state.result = new RENode(REOP_FLAT);
        state.result.chr = c;
        state.result.length = 1;
        state.result.flatIndex = -1;
        state.progLength += 3;
    }

    private static int
    getDecimalValue(char c, CompilerState state, int maxValue,
                    String overflowMessageId)
    {
        boolean overflow = false;
        int start = state.cp;
        char[] src = state.cpbegin;
        int value = c - '0';
        for (; state.cp != state.cpend; ++state.cp) {
            c = src[state.cp];
            if (!isDigit(c)) {
                break;
            }
            if (!overflow) {
                int digit = c - '0';
                if (value < (maxValue - digit) / 10) {
                    value = value * 10 + digit;
                } else {
                    overflow = true;
                    value = maxValue;
                }
            }
        }
        if (overflow) {
            reportError(overflowMessageId,
                        String.valueOf(src, start, state.cp - start));
        }
        return value;
    }

    private static boolean
    parseTerm(CompilerState state)
    {
        char[] src = state.cpbegin;
        char c = src[state.cp++];
        int nDigits = 2;
        int parenBaseCount = state.parenCount;
        int num, tmp;
        RENode term;
        int termStart;

        switch (c) {
        /* assertions and atoms */
        case '^':
            state.result = new RENode(REOP_BOL);
            state.progLength++;
            return true;
        case '$':
            state.result = new RENode(REOP_EOL);
            state.progLength++;
            return true;
        case '\\':
            if (state.cp < state.cpend) {
                c = src[state.cp++];
                switch (c) {
                /* assertion escapes */
                case 'b' :
                    state.result = new RENode(REOP_WBDRY);
                    state.progLength++;
                    return true;
                case 'B':
                    state.result = new RENode(REOP_WNONBDRY);
                    state.progLength++;
                    return true;
                /* Decimal escape */
                case '0':
/*
 * Under 'strict' ECMA 3, we interpret \0 as NUL and don't accept octal.
 * However, (XXX and since Rhino doesn't have a 'strict' mode) we'll just
 * behave the old way for compatibility reasons.
 * (see http://bugzilla.mozilla.org/show_bug.cgi?id=141078)
 *
 */
                    reportWarning(state.cx, "msg.bad.backref", "");
                    /* octal escape */
                    num = 0;
                    while (state.cp < state.cpend) {
                        c = src[state.cp];
                        if ((c >= '0') && (c <= '7')) {
                            state.cp++;
                            tmp = 8 * num + (c - '0');
                            if (tmp > 0377)
                                break;
                            num = tmp;
                        }
                        else
                            break;
                    }
                    c = (char)(num);
                    doFlat(state, c);
                    break;
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                case '8':
                case '9':
                    termStart = state.cp - 1;
                    num = getDecimalValue(c, state, 0xFFFF,
                                          "msg.overlarge.backref");
                    if (num > state.parenCount)
                        reportWarning(state.cx, "msg.bad.backref", "");
                    /*
                     * n > 9 or > count of parentheses,
                     * then treat as octal instead.
                     */
                    if ((num > 9) && (num > state.parenCount)) {
                        state.cp = termStart;
                        num = 0;
                        while (state.cp < state.cpend) {
                            c = src[state.cp];
                            if ((c >= '0') && (c <= '7')) {
                                state.cp++;
                                tmp = 8 * num + (c - '0');
                                if (tmp > 0377)
                                    break;
                                num = tmp;
                            }
                            else
                                break;
                        }
                        c = (char)(num);
                        doFlat(state, c);
                        break;
                    }
                    /* otherwise, it's a back-reference */
                    state.result = new RENode(REOP_BACKREF);
                    state.result.parenIndex = num - 1;
                    state.progLength += 3;
                    break;
                /* Control escape */
                case 'f':
                    c = 0xC;
                    doFlat(state, c);
                    break;
                case 'n':
                    c = 0xA;
                    doFlat(state, c);
                    break;
                case 'r':
                    c = 0xD;
                    doFlat(state, c);
                    break;
                case 't':
                    c = 0x9;
                    doFlat(state, c);
                    break;
                case 'v':
                    c = 0xB;
                    doFlat(state, c);
                    break;
                /* Control letter */
                case 'c':
                    if (((state.cp + 1) < state.cpend) &&
                                        Character.isLetter(src[state.cp + 1]))
                        c = (char)(src[state.cp++] & 0x1F);
                    else {
                        /* back off to accepting the original '\' as a literal */
                        --state.cp;
                        c = '\\';
                    }
                    doFlat(state, c);
                    break;
                /* UnicodeEscapeSequence */
                case 'u':
                    nDigits += 2;
                    // fall thru...
                /* HexEscapeSequence */
                case 'x':
                    {
                        int n = 0;
                        int i;
                        for (i = 0; (i < nDigits)
                                && (state.cp < state.cpend); i++) {
                            c = src[state.cp++];
                            n = Kit.xDigitToInt(c, n);
                            if (n < 0) {
                                // Back off to accepting the original
                                // 'u' or 'x' as a literal
                                state.cp -= (i + 2);
                                n = src[state.cp++];
                                break;
                            }
                        }
                        c = (char)(n);
                    }
                    doFlat(state, c);
                    break;
                /* Character class escapes */
                case 'd':
                    state.result = new RENode(REOP_DIGIT);
                    state.progLength++;
                    break;
                case 'D':
                    state.result = new RENode(REOP_NONDIGIT);
                    state.progLength++;
                    break;
                case 's':
                    state.result = new RENode(REOP_SPACE);
                    state.progLength++;
                    break;
                case 'S':
                    state.result = new RENode(REOP_NONSPACE);
                    state.progLength++;
                    break;
                case 'w':
                    state.result = new RENode(REOP_ALNUM);
                    state.progLength++;
                    break;
                case 'W':
                    state.result = new RENode(REOP_NONALNUM);
                    state.progLength++;
                    break;
                /* IdentityEscape */
                default:
                    state.result = new RENode(REOP_FLAT);
                    state.result.chr = c;
                    state.result.length = 1;
                    state.result.flatIndex = state.cp - 1;
                    state.progLength += 3;
                    break;
                }
                break;
            }
            else {
                /* a trailing '\' is an error */
                reportError("msg.trail.backslash", "");
                return false;
            }
        case '(': {
            RENode result = null;
            termStart = state.cp;
            if (state.cp + 1 < state.cpend && src[state.cp] == '?'
                && ((c = src[state.cp + 1]) == '=' || c == '!' || c == ':'))
            {
                state.cp += 2;
                if (c == '=') {
                    result = new RENode(REOP_ASSERT);
                    /* ASSERT, <next>, ... ASSERTTEST */
                    state.progLength += 4;
                } else if (c == '!') {
                    result = new RENode(REOP_ASSERT_NOT);
                    /* ASSERTNOT, <next>, ... ASSERTNOTTEST */
                    state.progLength += 4;
                }
            } else {
                result = new RENode(REOP_LPAREN);
                /* LPAREN, <index>, ... RPAREN, <index> */
                state.progLength += 6;
                result.parenIndex = state.parenCount++;
            }
            ++state.parenNesting;
            if (!parseDisjunction(state))
                return false;
            if (state.cp == state.cpend || src[state.cp] != ')') {
                reportError("msg.unterm.paren", "in regular expression"/*APPJET*/);
                return false;
            }
            ++state.cp;
            --state.parenNesting;
            if (result != null) {
                result.kid = state.result;
                state.result = result;
            }
            break;
        }
        case ')':
          reportError("msg.re.unmatched.right.paren", "");
          return false;
        case '[':
            state.result = new RENode(REOP_CLASS);
            termStart = state.cp;
            state.result.startIndex = termStart;
            while (true) {
                if (state.cp == state.cpend) {
                    reportError("msg.unterm.class", "");
                    return false;
                }
                if (src[state.cp] == '\\')
                    state.cp++;
                else {
                    if (src[state.cp] == ']') {
                        state.result.kidlen = state.cp - termStart;
                        break;
                    }
                }
                state.cp++;
            }
            state.result.index = state.classCount++;
            /*
             * Call calculateBitmapSize now as we want any errors it finds
             * to be reported during the parse phase, not at execution.
             */
            if (!calculateBitmapSize(state, state.result, src, termStart, state.cp++))
                return false;
            state.progLength += 3; /* CLASS, <index> */
            break;

        case '.':
            state.result = new RENode(REOP_DOT);
            state.progLength++;
            break;
        case '*':
        case '+':
        case '?':
            reportError("msg.bad.quant", String.valueOf(src[state.cp - 1]));
            return false;
        default:
            state.result = new RENode(REOP_FLAT);
            state.result.chr = c;
            state.result.length = 1;
            state.result.flatIndex = state.cp - 1;
            state.progLength += 3;
            break;
        }

        term = state.result;
        if (state.cp == state.cpend) {
            return true;
        }
        boolean hasQ = false;
        switch (src[state.cp]) {
            case '+':
                state.result = new RENode(REOP_QUANT);
                state.result.min = 1;
                state.result.max = -1;
                /* <PLUS>, <parencount>, <parenindex>, <next> ... <ENDCHILD> */
                state.progLength += 8;
                hasQ = true;
                break;
            case '*':
                state.result = new RENode(REOP_QUANT);
                state.result.min = 0;
                state.result.max = -1;
                /* <STAR>, <parencount>, <parenindex>, <next> ... <ENDCHILD> */
                state.progLength += 8;
                hasQ = true;
                break;
            case '?':
                state.result = new RENode(REOP_QUANT);
                state.result.min = 0;
                state.result.max = 1;
                /* <OPT>, <parencount>, <parenindex>, <next> ... <ENDCHILD> */
                state.progLength += 8;
                hasQ = true;
                break;
            case '{':  /* balance '}' */
            {
                int min = 0;
                int max = -1;
                int leftCurl = state.cp;

               /* For Perl etc. compatibility, if quntifier does not match
                * \{\d+(,\d*)?\} exactly back off from it
                * being a quantifier, and chew it up as a literal
                * atom next time instead.
                */

                c = src[++state.cp];
                if (isDigit(c)) {
                    ++state.cp;
                    min = getDecimalValue(c, state, 0xFFFF,
                                          "msg.overlarge.min");
                    c = src[state.cp];
                    if (c == ',') {
                        c = src[++state.cp];
                        if (isDigit(c)) {
                            ++state.cp;
                            max = getDecimalValue(c, state, 0xFFFF,
                                                  "msg.overlarge.max");
                            c = src[state.cp];
                            if (min > max) {
                                reportError("msg.max.lt.min",
                                            String.valueOf(src[state.cp]));
                                return false;
                            }
                        }
                    } else {
                        max = min;
                    }
                    /* balance '{' */
                    if (c == '}') {
                        state.result = new RENode(REOP_QUANT);
                        state.result.min = min;
                        state.result.max = max;
                        // QUANT, <min>, <max>, <parencount>,
                        // <parenindex>, <next> ... <ENDCHILD>
                        state.progLength += 12;
                        hasQ = true;
                    }
                }
                if (!hasQ) {
                    state.cp = leftCurl;
                }
                break;
            }
        }
        if (!hasQ)
            return true;

        ++state.cp;
        state.result.kid = term;
        state.result.parenIndex = parenBaseCount;
        state.result.parenCount = state.parenCount - parenBaseCount;
        if ((state.cp < state.cpend) && (src[state.cp] == '?')) {
            ++state.cp;
            state.result.greedy = false;
        }
        else
            state.result.greedy = true;
        return true;
    }

    private static void resolveForwardJump(byte[] array, int from, int pc)
    {
        if (from > pc) throw Kit.codeBug();
        addIndex(array, from, pc - from);
    }

    private static int getOffset(byte[] array, int pc)
    {
        return getIndex(array, pc);
    }

    private static int addIndex(byte[] array, int pc, int index)
    {
        if (index < 0) throw Kit.codeBug();
        if (index > 0xFFFF)
            throw Context.reportRuntimeError("Too complex regexp");
        array[pc] = (byte)(index >> 8);
        array[pc + 1] = (byte)(index);
        return pc + 2;
    }

    private static int getIndex(byte[] array, int pc)
    {
        return ((array[pc] & 0xFF) << 8) | (array[pc + 1] & 0xFF);
    }

    private static final int OFFSET_LEN = 2;
    private static final int INDEX_LEN  = 2;

    private static int
    emitREBytecode(CompilerState state, RECompiled re, int pc, RENode t)
    {
        RENode nextAlt;
        int nextAltFixup, nextTermFixup;
        byte[] program = re.program;

        while (t != null) {
            program[pc++] = t.op;
            switch (t.op) {
            case REOP_EMPTY:
                --pc;
                break;
            case REOP_ALT:
                nextAlt = t.kid2;
                nextAltFixup = pc;    /* address of next alternate */
                pc += OFFSET_LEN;
                pc = emitREBytecode(state, re, pc, t.kid);
                program[pc++] = REOP_JUMP;
                nextTermFixup = pc;    /* address of following term */
                pc += OFFSET_LEN;
                resolveForwardJump(program, nextAltFixup, pc);
                pc = emitREBytecode(state, re, pc, nextAlt);

                program[pc++] = REOP_JUMP;
                nextAltFixup = pc;
                pc += OFFSET_LEN;

                resolveForwardJump(program, nextTermFixup, pc);
                resolveForwardJump(program, nextAltFixup, pc);
                break;
            case REOP_FLAT:
                /*
                 * Consecutize FLAT's if possible.
                 */
                if (t.flatIndex != -1) {
                    while ((t.next != null) && (t.next.op == REOP_FLAT)
                            && ((t.flatIndex + t.length)
                                            == t.next.flatIndex)) {
                        t.length += t.next.length;
                        t.next = t.next.next;
                    }
                }
                if ((t.flatIndex != -1) && (t.length > 1)) {
                    if ((state.flags & JSREG_FOLD) != 0)
                        program[pc - 1] = REOP_FLATi;
                    else
                        program[pc - 1] = REOP_FLAT;
                    pc = addIndex(program, pc, t.flatIndex);
                    pc = addIndex(program, pc, t.length);
                }
                else {
                    if (t.chr < 256) {
                        if ((state.flags & JSREG_FOLD) != 0)
                            program[pc - 1] = REOP_FLAT1i;
                        else
                            program[pc - 1] = REOP_FLAT1;
                        program[pc++] = (byte)(t.chr);
                    }
                    else {
                        if ((state.flags & JSREG_FOLD) != 0)
                            program[pc - 1] = REOP_UCFLAT1i;
                        else
                            program[pc - 1] = REOP_UCFLAT1;
                        pc = addIndex(program, pc, t.chr);
                    }
                }
                break;
            case REOP_LPAREN:
                pc = addIndex(program, pc, t.parenIndex);
                pc = emitREBytecode(state, re, pc, t.kid);
                program[pc++] = REOP_RPAREN;
                pc = addIndex(program, pc, t.parenIndex);
                break;
            case REOP_BACKREF:
                pc = addIndex(program, pc, t.parenIndex);
                break;
            case REOP_ASSERT:
                nextTermFixup = pc;
                pc += OFFSET_LEN;
                pc = emitREBytecode(state, re, pc, t.kid);
                program[pc++] = REOP_ASSERTTEST;
                resolveForwardJump(program, nextTermFixup, pc);
                break;
            case REOP_ASSERT_NOT:
                nextTermFixup = pc;
                pc += OFFSET_LEN;
                pc = emitREBytecode(state, re, pc, t.kid);
                program[pc++] = REOP_ASSERTNOTTEST;
                resolveForwardJump(program, nextTermFixup, pc);
                break;
            case REOP_QUANT:
                if ((t.min == 0) && (t.max == -1))
                    program[pc - 1] = (t.greedy) ? REOP_STAR : REOP_MINIMALSTAR;
                else
                if ((t.min == 0) && (t.max == 1))
                    program[pc - 1] = (t.greedy) ? REOP_OPT : REOP_MINIMALOPT;
                else
                if ((t.min == 1) && (t.max == -1))
                    program[pc - 1] = (t.greedy) ? REOP_PLUS : REOP_MINIMALPLUS;
                else {
                    if (!t.greedy) program[pc - 1] = REOP_MINIMALQUANT;
                    pc = addIndex(program, pc, t.min);
                    // max can be -1 which addIndex does not accept
                    pc = addIndex(program, pc, t.max + 1);
                }
                pc = addIndex(program, pc, t.parenCount);
                pc = addIndex(program, pc, t.parenIndex);
                nextTermFixup = pc;
                pc += OFFSET_LEN;
                pc = emitREBytecode(state, re, pc, t.kid);
                program[pc++] = REOP_ENDCHILD;
                resolveForwardJump(program, nextTermFixup, pc);
                break;
            case REOP_CLASS:
                pc = addIndex(program, pc, t.index);
                re.classList[t.index] = new RECharSet(t.bmsize, t.startIndex,
                                                      t.kidlen);
                break;
            default:
                break;
            }
            t = t.next;
        }
        return pc;
    }

    private static void
    pushProgState(REGlobalData gData, int min, int max,
                  REBackTrackData backTrackLastToSave,
                  int continuation_pc, int continuation_op)
    {
        gData.stateStackTop = new REProgState(gData.stateStackTop, min, max,
                                              gData.cp, backTrackLastToSave,
                                              continuation_pc,
                                              continuation_op);
    }

    private static REProgState
    popProgState(REGlobalData gData)
    {
        REProgState state = gData.stateStackTop;
        gData.stateStackTop = state.previous;
        return state;
    }

    private static void
    pushBackTrackState(REGlobalData gData, byte op, int target)
    {
        gData.backTrackStackTop = new REBackTrackData(gData, op, target);
    }

    /*
     *   Consecutive literal characters.
     */
    private static boolean
    flatNMatcher(REGlobalData gData, int matchChars,
                 int length, char[] chars, int end)
    {
        if ((gData.cp + length) > end)
            return false;
        for (int i = 0; i < length; i++) {
            if (gData.regexp.source[matchChars + i] != chars[gData.cp + i]) {
                return false;
            }
        }
        gData.cp += length;
        return true;
    }

    private static boolean
    flatNIMatcher(REGlobalData gData, int matchChars,
                  int length, char[] chars, int end)
    {
        if ((gData.cp + length) > end)
            return false;
        for (int i = 0; i < length; i++) {
            if (upcase(gData.regexp.source[matchChars + i])
                != upcase(chars[gData.cp + i]))
            {
                return false;
            }
        }
        gData.cp += length;
        return true;
    }

    /*
    1. Evaluate DecimalEscape to obtain an EscapeValue E.
    2. If E is not a character then go to step 6.
    3. Let ch be E's character.
    4. Let A be a one-element RECharSet containing the character ch.
    5. Call CharacterSetMatcher(A, false) and return its Matcher result.
    6. E must be an integer. Let n be that integer.
    7. If n=0 or n>NCapturingParens then throw a SyntaxError exception.
    8. Return an internal Matcher closure that takes two arguments, a State x
       and a Continuation c, and performs the following:
        1. Let cap be x's captures internal array.
        2. Let s be cap[n].
        3. If s is undefined, then call c(x) and return its result.
        4. Let e be x's endIndex.
        5. Let len be s's length.
        6. Let f be e+len.
        7. If f>InputLength, return failure.
        8. If there exists an integer i between 0 (inclusive) and len (exclusive)
           such that Canonicalize(s[i]) is not the same character as
           Canonicalize(Input [e+i]), then return failure.
        9. Let y be the State (f, cap).
        10. Call c(y) and return its result.
    */
    private static boolean
    backrefMatcher(REGlobalData gData, int parenIndex,
                   char[] chars, int end)
    {
        int len;
        int i;
        int parenContent = gData.parens_index(parenIndex);
        if (parenContent == -1)
            return true;

        len = gData.parens_length(parenIndex);
        if ((gData.cp + len) > end)
            return false;

        if ((gData.regexp.flags & JSREG_FOLD) != 0) {
            for (i = 0; i < len; i++) {
                if (upcase(chars[parenContent + i]) != upcase(chars[gData.cp + i]))
                    return false;
            }
        }
        else {
            for (i = 0; i < len; i++) {
                if (chars[parenContent + i] != chars[gData.cp + i])
                    return false;
            }
        }
        gData.cp += len;
        return true;
    }


    /* Add a single character to the RECharSet */
    private static void
    addCharacterToCharSet(RECharSet cs, char c)
    {
        int byteIndex = (c / 8);
        if (c > cs.length)
            throw new RuntimeException();
        cs.bits[byteIndex] |= 1 << (c & 0x7);
    }


    /* Add a character range, c1 to c2 (inclusive) to the RECharSet */
    private static void
    addCharacterRangeToCharSet(RECharSet cs, char c1, char c2)
    {
        int i;

        int byteIndex1 = (c1 / 8);
        int byteIndex2 = (c2 / 8);

        if ((c2 > cs.length) || (c1 > c2))
            throw new RuntimeException();

        c1 &= 0x7;
        c2 &= 0x7;

        if (byteIndex1 == byteIndex2) {
            cs.bits[byteIndex1] |= ((0xFF) >> (7 - (c2 - c1))) << c1;
        }
        else {
            cs.bits[byteIndex1] |= 0xFF << c1;
            for (i = byteIndex1 + 1; i < byteIndex2; i++)
                cs.bits[i] = (byte)0xFF;
            cs.bits[byteIndex2] |= (0xFF) >> (7 - c2);
        }
    }

    /* Compile the source of the class into a RECharSet */
    private static void
    processCharSet(REGlobalData gData, RECharSet charSet)
    {
        synchronized (charSet) {
            if (!charSet.converted) {
                processCharSetImpl(gData, charSet);
                charSet.converted = true;
            }
        }
    }


    private static void
    processCharSetImpl(REGlobalData gData, RECharSet charSet)
    {
        int src = charSet.startIndex;
        int end = src + charSet.strlength;

        char rangeStart = 0, thisCh;
        int byteLength;
        char c;
        int n;
        int nDigits;
        int i;
        boolean inRange = false;

        charSet.sense = true;
        byteLength = (charSet.length / 8) + 1;
        charSet.bits = new byte[byteLength];

        if (src == end)
            return;

        if (gData.regexp.source[src] == '^') {
            charSet.sense = false;
            ++src;
        }

        while (src != end) {
            nDigits = 2;
            switch (gData.regexp.source[src]) {
            case '\\':
                ++src;
                c = gData.regexp.source[src++];
                switch (c) {
                case 'b':
                    thisCh = 0x8;
                    break;
                case 'f':
                    thisCh = 0xC;
                    break;
                case 'n':
                    thisCh = 0xA;
                    break;
                case 'r':
                    thisCh = 0xD;
                    break;
                case 't':
                    thisCh = 0x9;
                    break;
                case 'v':
                    thisCh = 0xB;
                    break;
                case 'c':
                    if (((src + 1) < end) && isWord(gData.regexp.source[src + 1]))
                        thisCh = (char)(gData.regexp.source[src++] & 0x1F);
                    else {
                        --src;
                        thisCh = '\\';
                    }
                    break;
                case 'u':
                    nDigits += 2;
                    // fall thru
                case 'x':
                    n = 0;
                    for (i = 0; (i < nDigits) && (src < end); i++) {
                        c = gData.regexp.source[src++];
                        int digit = toASCIIHexDigit(c);
                        if (digit < 0) {
                            /* back off to accepting the original '\'
                             * as a literal
                             */
                            src -= (i + 1);
                            n = '\\';
                            break;
                        }
                        n = (n << 4) | digit;
                    }
                    thisCh = (char)(n);
                    break;
                case '0':
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                    /*
                     *  This is a non-ECMA extension - decimal escapes (in this
                     *  case, octal!) are supposed to be an error inside class
                     *  ranges, but supported here for backwards compatibility.
                     *
                     */
                    n = (c - '0');
                    c = gData.regexp.source[src];
                    if ('0' <= c && c <= '7') {
                        src++;
                        n = 8 * n + (c - '0');
                        c = gData.regexp.source[src];
                        if ('0' <= c && c <= '7') {
                            src++;
                            i = 8 * n + (c - '0');
                            if (i <= 0377)
                                n = i;
                            else
                                src--;
                        }
                    }
                    thisCh = (char)(n);
                    break;

                case 'd':
                    addCharacterRangeToCharSet(charSet, '0', '9');
                    continue;   /* don't need range processing */
                case 'D':
                    addCharacterRangeToCharSet(charSet, (char)0, (char)('0' - 1));
                    addCharacterRangeToCharSet(charSet, (char)('9' + 1),
                                                (char)(charSet.length));
                    continue;
                case 's':
                    for (i = charSet.length; i >= 0; i--)
                        if (isREWhiteSpace(i))
                            addCharacterToCharSet(charSet, (char)(i));
                    continue;
                case 'S':
                    for (i = charSet.length; i >= 0; i--)
                        if (!isREWhiteSpace(i))
                            addCharacterToCharSet(charSet, (char)(i));
                    continue;
                case 'w':
                    for (i = charSet.length; i >= 0; i--)
                        if (isWord((char)i))
                            addCharacterToCharSet(charSet, (char)(i));
                    continue;
                case 'W':
                    for (i = charSet.length; i >= 0; i--)
                        if (!isWord((char)i))
                            addCharacterToCharSet(charSet, (char)(i));
                    continue;
                default:
                    thisCh = c;
                    break;

                }
                break;

            default:
                thisCh = gData.regexp.source[src++];
                break;

            }
            if (inRange) {
                if ((gData.regexp.flags & JSREG_FOLD) != 0) {
                    addCharacterRangeToCharSet(charSet,
                                               upcase(rangeStart),
                                               upcase(thisCh));
                    addCharacterRangeToCharSet(charSet,
                                               downcase(rangeStart),
                                               downcase(thisCh));
                } else {
                    addCharacterRangeToCharSet(charSet, rangeStart, thisCh);
                }
                inRange = false;
            }
            else {
                if ((gData.regexp.flags & JSREG_FOLD) != 0) {
                    addCharacterToCharSet(charSet, upcase(thisCh));
                    addCharacterToCharSet(charSet, downcase(thisCh));
                } else {
                    addCharacterToCharSet(charSet, thisCh);
                }
                if (src < (end - 1)) {
                    if (gData.regexp.source[src] == '-') {
                        ++src;
                        inRange = true;
                        rangeStart = thisCh;
                    }
                }
            }
        }
    }


    /*
     *   Initialize the character set if it this is the first call.
     *   Test the bit - if the ^ flag was specified, non-inclusion is a success
     */
    private static boolean
    classMatcher(REGlobalData gData, RECharSet charSet, char ch)
    {
        if (!charSet.converted) {
            processCharSet(gData, charSet);
        }

        int byteIndex = ch / 8;
        if (charSet.sense) {
            if ((charSet.length == 0) ||
                 ( (ch > charSet.length)
                    || ((charSet.bits[byteIndex] & (1 << (ch & 0x7))) == 0) ))
                return false;
        } else {
            if (! ((charSet.length == 0) ||
                     ( (ch > charSet.length)
                        || ((charSet.bits[byteIndex] & (1 << (ch & 0x7))) == 0) )))
                return false;
        }
        return true;
    }

    private static boolean
    executeREBytecode(REGlobalData gData, char[] chars, int end)
    {
        int pc = 0;
        byte program[] = gData.regexp.program;
        int currentContinuation_op;
        int currentContinuation_pc;
        boolean result = false;

        currentContinuation_pc = 0;
        currentContinuation_op = REOP_END;
if (debug) {
System.out.println("Input = \"" + new String(chars) + "\", start at " + gData.cp);
}
        int op = program[pc++];
        for (;;) {
if (debug) {
System.out.println("Testing at " + gData.cp + ", op = " + op);
}
            switch (op) {
            case REOP_EMPTY:
                result = true;
                break;
            case REOP_BOL:
                if (gData.cp != 0) {
                    if (gData.multiline ||
                            ((gData.regexp.flags & JSREG_MULTILINE) != 0)) {
                        if (!isLineTerm(chars[gData.cp - 1])) {
                            result = false;
                            break;
                        }
                    }
                    else {
                        result = false;
                        break;
                    }
                }
                result = true;
                break;
            case REOP_EOL:
                if (gData.cp != end) {
                    if (gData.multiline ||
                            ((gData.regexp.flags & JSREG_MULTILINE) != 0)) {
                        if (!isLineTerm(chars[gData.cp])) {
                            result = false;
                            break;
                        }
                    }
                    else {
                        result = false;
                        break;
                    }
                }
                result = true;
                break;
            case REOP_WBDRY:
                result = ((gData.cp == 0 || !isWord(chars[gData.cp - 1]))
                          ^ !((gData.cp < end) && isWord(chars[gData.cp])));
                break;
            case REOP_WNONBDRY:
                result = ((gData.cp == 0 || !isWord(chars[gData.cp - 1]))
                          ^ ((gData.cp < end) && isWord(chars[gData.cp])));
                break;
            case REOP_DOT:
                result = (gData.cp != end && !isLineTerm(chars[gData.cp]));
                if (result) {
                    gData.cp++;
                }
                break;
            case REOP_DIGIT:
                result = (gData.cp != end && isDigit(chars[gData.cp]));
                if (result) {
                    gData.cp++;
                }
                break;
            case REOP_NONDIGIT:
                result = (gData.cp != end && !isDigit(chars[gData.cp]));
                if (result) {
                    gData.cp++;
                }
                break;
            case REOP_SPACE:
                result = (gData.cp != end && isREWhiteSpace(chars[gData.cp]));
                if (result) {
                    gData.cp++;
                }
                break;
            case REOP_NONSPACE:
                result = (gData.cp != end && !isREWhiteSpace(chars[gData.cp]));
                if (result) {
                    gData.cp++;
                }
                break;
            case REOP_ALNUM:
                result = (gData.cp != end && isWord(chars[gData.cp]));
                if (result) {
                    gData.cp++;
                }
                break;
            case REOP_NONALNUM:
                result = (gData.cp != end && !isWord(chars[gData.cp]));
                if (result) {
                    gData.cp++;
                }
                break;
            case REOP_FLAT:
                {
                    int offset = getIndex(program, pc);
                    pc += INDEX_LEN;
                    int length = getIndex(program, pc);
                    pc += INDEX_LEN;
                    result = flatNMatcher(gData, offset, length, chars, end);
                }
                break;
            case REOP_FLATi:
                {
                    int offset = getIndex(program, pc);
                    pc += INDEX_LEN;
                    int length = getIndex(program, pc);
                    pc += INDEX_LEN;
                    result = flatNIMatcher(gData, offset, length, chars, end);
                }
                break;
            case REOP_FLAT1:
                {
                    char matchCh = (char)(program[pc++] & 0xFF);
                    result = (gData.cp != end && chars[gData.cp] == matchCh);
                    if (result) {
                        gData.cp++;
                    }
                }
                break;
            case REOP_FLAT1i:
                {
                    char matchCh = (char)(program[pc++] & 0xFF);
                    result = (gData.cp != end
                              && upcase(chars[gData.cp]) == upcase(matchCh));
                    if (result) {
                        gData.cp++;
                    }
                }
                break;
            case REOP_UCFLAT1:
                {
                    char matchCh = (char)getIndex(program, pc);
                    pc += INDEX_LEN;
                    result = (gData.cp != end && chars[gData.cp] == matchCh);
                    if (result) {
                        gData.cp++;
                    }
                }
                break;
            case REOP_UCFLAT1i:
                {
                    char matchCh = (char)getIndex(program, pc);
                    pc += INDEX_LEN;
                    result = (gData.cp != end
                              && upcase(chars[gData.cp]) == upcase(matchCh));
                    if (result) {
                        gData.cp++;
                    }
                }
                break;
            case REOP_ALT:
                {
                    int nextpc;
                    byte nextop;
                    pushProgState(gData, 0, 0, null,
                                  currentContinuation_pc,
                                  currentContinuation_op);
                    nextpc = pc + getOffset(program, pc);
                    nextop = program[nextpc++];
                    pushBackTrackState(gData, nextop, nextpc);
                    pc += INDEX_LEN;
                    op = program[pc++];
                }
                continue;

            case REOP_JUMP:
                {
                    int offset;
                    REProgState state = popProgState(gData);
                    currentContinuation_pc = state.continuation_pc;
                    currentContinuation_op = state.continuation_op;
                    offset = getOffset(program, pc);
                    pc += offset;
                    op = program[pc++];
                }
                continue;


            case REOP_LPAREN:
                {
                    int parenIndex = getIndex(program, pc);
                    pc += INDEX_LEN;
                    gData.set_parens(parenIndex, gData.cp, 0);
                    op = program[pc++];
                }
                continue;
            case REOP_RPAREN:
                {
                    int cap_index;
                    int parenIndex = getIndex(program, pc);
                    pc += INDEX_LEN;
                    cap_index = gData.parens_index(parenIndex);
                    gData.set_parens(parenIndex, cap_index,
                                     gData.cp - cap_index);
                    if (parenIndex > gData.lastParen)
                        gData.lastParen = parenIndex;
                    op = program[pc++];
                }
                continue;
            case REOP_BACKREF:
                {
                    int parenIndex = getIndex(program, pc);
                    pc += INDEX_LEN;
                    result = backrefMatcher(gData, parenIndex, chars, end);
                }
                break;

            case REOP_CLASS:
                {
                    int index = getIndex(program, pc);
                    pc += INDEX_LEN;
                    if (gData.cp != end) {
                        if (classMatcher(gData, gData.regexp.classList[index],
                                         chars[gData.cp]))
                        {
                            gData.cp++;
                            result = true;
                            break;
                        }
                    }
                    result = false;
                }
                break;

            case REOP_ASSERT:
            case REOP_ASSERT_NOT:
                {
                    byte testOp;
                    pushProgState(gData, 0, 0, gData.backTrackStackTop,
                                  currentContinuation_pc,
                                  currentContinuation_op);
                    if (op == REOP_ASSERT) {
                        testOp = REOP_ASSERTTEST;
                    } else {
                        testOp = REOP_ASSERTNOTTEST;
                    }
                    pushBackTrackState(gData, testOp,
                                       pc + getOffset(program, pc));
                    pc += INDEX_LEN;
                    op = program[pc++];
                }
                continue;

            case REOP_ASSERTTEST:
            case REOP_ASSERTNOTTEST:
                {
                    REProgState state = popProgState(gData);
                    gData.cp = state.index;
                    gData.backTrackStackTop = state.backTrack;
                    currentContinuation_pc = state.continuation_pc;
                    currentContinuation_op = state.continuation_op;
                    if (result) {
                        if (op == REOP_ASSERTTEST) {
                            result = true;
                        } else {
                            result = false;
                        }
                    } else {
                        if (op == REOP_ASSERTTEST) {
                            // Do nothing
                        } else {
                            result = true;
                        }
                    }
                }
                break;

            case REOP_STAR:
            case REOP_PLUS:
            case REOP_OPT:
            case REOP_QUANT:
            case REOP_MINIMALSTAR:
            case REOP_MINIMALPLUS:
            case REOP_MINIMALOPT:
            case REOP_MINIMALQUANT:
                {
                    int min, max;
                    boolean greedy = false;
                    switch (op) {
                      case REOP_STAR:
                        greedy = true;
                        // fallthrough
                      case REOP_MINIMALSTAR:
                        min = 0;
                        max = -1;
                        break;
                      case REOP_PLUS:
                        greedy = true;
                        // fallthrough
                      case REOP_MINIMALPLUS:
                        min = 1;
                        max = -1;
                        break;
                      case REOP_OPT:
                        greedy = true;
                        // fallthrough
                      case REOP_MINIMALOPT:
                        min = 0;
                        max = 1;
                        break;
                      case REOP_QUANT:
                        greedy = true;
                        // fallthrough
                      case REOP_MINIMALQUANT:
                        min = getOffset(program, pc);
                        pc += INDEX_LEN;
                        // See comments in emitREBytecode for " - 1" reason
                        max = getOffset(program, pc) - 1;
                        pc += INDEX_LEN;
                        break;
                      default:
                        throw Kit.codeBug();
                    }
                    pushProgState(gData, min, max, null,
                                  currentContinuation_pc,
                                  currentContinuation_op);
                    if (greedy) {
                        currentContinuation_op = REOP_REPEAT;
                        currentContinuation_pc = pc;
                        pushBackTrackState(gData, REOP_REPEAT, pc);
                        /* Step over <parencount>, <parenindex> & <next> */
                        pc += 3 * INDEX_LEN;
                        op = program[pc++];
                    } else {
                        if (min != 0) {
                            currentContinuation_op = REOP_MINIMALREPEAT;
                            currentContinuation_pc = pc;
                            /* <parencount> <parenindex> & <next> */
                            pc += 3 * INDEX_LEN;
                            op = program[pc++];
                        } else {
                            pushBackTrackState(gData, REOP_MINIMALREPEAT, pc);
                            popProgState(gData);
                            pc += 2 * INDEX_LEN;  // <parencount> & <parenindex>
                            pc = pc + getOffset(program, pc);
                            op = program[pc++];
                        }
                    }
                }
                continue;

            case REOP_ENDCHILD:
                // Use the current continuation.
                pc = currentContinuation_pc;
                op = currentContinuation_op;
                continue;

            case REOP_REPEAT:
                {
                    REProgState state = popProgState(gData);
                    if (!result) {
                        //
                        // There's been a failure, see if we have enough
                        // children.
                        //
                        if (state.min == 0)
                            result = true;
                        currentContinuation_pc = state.continuation_pc;
                        currentContinuation_op = state.continuation_op;
                        pc += 2 * INDEX_LEN;  /* <parencount> & <parenindex> */
                        pc = pc + getOffset(program, pc);
                        break;
                    }
                    else {
                        if (state.min == 0 && gData.cp == state.index) {
                            // matched an empty string, that'll get us nowhere
                            result = false;
                            currentContinuation_pc = state.continuation_pc;
                            currentContinuation_op = state.continuation_op;
                            pc += 2 * INDEX_LEN;
                            pc = pc + getOffset(program, pc);
                            break;
                        }
                        int new_min = state.min, new_max = state.max;
                        if (new_min != 0) new_min--;
                        if (new_max != -1) new_max--;
                        if (new_max == 0) {
                            result = true;
                            currentContinuation_pc = state.continuation_pc;
                            currentContinuation_op = state.continuation_op;
                            pc += 2 * INDEX_LEN;
                            pc = pc + getOffset(program, pc);
                            break;
                        }
                        pushProgState(gData, new_min, new_max, null,
                                      state.continuation_pc,
                                      state.continuation_op);
                        currentContinuation_op = REOP_REPEAT;
                        currentContinuation_pc = pc;
                        pushBackTrackState(gData, REOP_REPEAT, pc);
                        int parenCount = getIndex(program, pc);
                        pc += INDEX_LEN;
                        int parenIndex = getIndex(program, pc);
                        pc += 2 * INDEX_LEN;
                        op = program[pc++];
                        for (int k = 0; k < parenCount; k++) {
                            gData.set_parens(parenIndex + k, -1, 0);
                        }
                    }
                }
                continue;

            case REOP_MINIMALREPEAT:
                {
                    REProgState state = popProgState(gData);
                    if (!result) {
                        //
                        // Non-greedy failure - try to consume another child.
                        //
                        if (state.max == -1 || state.max > 0) {
                            pushProgState(gData, state.min, state.max, null,
                                          state.continuation_pc,
                                          state.continuation_op);
                            currentContinuation_op = REOP_MINIMALREPEAT;
                            currentContinuation_pc = pc;
                            int parenCount = getIndex(program, pc);
                            pc += INDEX_LEN;
                            int parenIndex = getIndex(program, pc);
                            pc += 2 * INDEX_LEN;
                            for (int k = 0; k < parenCount; k++) {
                                gData.set_parens(parenIndex + k, -1, 0);
                            }
                            op = program[pc++];
                            continue;
                        } else {
                            // Don't need to adjust pc since we're going to pop.
                            currentContinuation_pc = state.continuation_pc;
                            currentContinuation_op = state.continuation_op;
                            break;
                        }
                    } else {
                        if (state.min == 0 && gData.cp == state.index) {
                            // Matched an empty string, that'll get us nowhere.
                            result = false;
                            currentContinuation_pc = state.continuation_pc;
                            currentContinuation_op = state.continuation_op;
                            break;
                        }
                        int new_min = state.min, new_max = state.max;
                        if (new_min != 0) new_min--;
                        if (new_max != -1) new_max--;
                        pushProgState(gData, new_min, new_max, null,
                                      state.continuation_pc,
                                      state.continuation_op);
                        if (new_min != 0) {
                            currentContinuation_op = REOP_MINIMALREPEAT;
                            currentContinuation_pc = pc;
                            int parenCount = getIndex(program, pc);
                            pc += INDEX_LEN;
                            int parenIndex = getIndex(program, pc);
                            pc += 2 * INDEX_LEN;
                            for (int k = 0; k < parenCount; k++) {
                                gData.set_parens(parenIndex + k, -1, 0);
                            }
                            op = program[pc++];
                        } else {
                            currentContinuation_pc = state.continuation_pc;
                            currentContinuation_op = state.continuation_op;
                            pushBackTrackState(gData, REOP_MINIMALREPEAT, pc);
                            popProgState(gData);
                            pc += 2 * INDEX_LEN;
                            pc = pc + getOffset(program, pc);
                            op = program[pc++];
                        }
                        continue;
                    }
                }

            case REOP_END:
                return true;

            default:
                throw Kit.codeBug();

            }
            /*
             *  If the match failed and there's a backtrack option, take it.
             *  Otherwise this is a complete and utter failure.
             */
            if (!result) {
                REBackTrackData backTrackData = gData.backTrackStackTop;
                if (backTrackData != null) {
                    gData.backTrackStackTop = backTrackData.previous;

                    gData.lastParen = backTrackData.lastParen;

                    // XXX: If backTrackData will no longer be used, then
                    // there is no need to clone backTrackData.parens
                    if (backTrackData.parens != null) {
                        gData.parens = backTrackData.parens.clone();
                    }

                    gData.cp = backTrackData.cp;

                    gData.stateStackTop = backTrackData.stateStackTop;

                    currentContinuation_op
                        = gData.stateStackTop.continuation_op;
                    currentContinuation_pc
                        = gData.stateStackTop.continuation_pc;
                    pc = backTrackData.continuation_pc;
                    op = backTrackData.continuation_op;
                    continue;
                }
                else
                    return false;
            }

            op = program[pc++];
        }

    }

    private static boolean
    matchRegExp(REGlobalData gData, RECompiled re,
                char[] chars, int start, int end, boolean multiline)
    {
        if (re.parenCount != 0) {
            gData.parens = new long[re.parenCount];
        } else {
            gData.parens = null;
        }

        gData.backTrackStackTop = null;

        gData.stateStackTop = null;

        gData.multiline = multiline;
        gData.regexp = re;
        gData.lastParen = 0;

        int anchorCh = gData.regexp.anchorCh;
        //
        // have to include the position beyond the last character
        //  in order to detect end-of-input/line condition
        //
        for (int i = start; i <= end; ++i) {
            //
            // If the first node is a literal match, step the index into
            // the string until that match is made, or fail if it can't be
            // found at all.
            //
            if (anchorCh >= 0) {
                for (;;) {
                    if (i == end) {
                        return false;
                    }
                    char matchCh = chars[i];
                    if (matchCh == anchorCh ||
                            ((gData.regexp.flags & JSREG_FOLD) != 0
                             && upcase(matchCh) == upcase((char)anchorCh)))
                    {
                        break;
                    }
                    ++i;
                }
            }
            gData.cp = i;
            for (int j = 0; j < re.parenCount; j++) {
                gData.set_parens(j, -1, 0);
            }
            boolean result = executeREBytecode(gData, chars, end);

            gData.backTrackStackTop = null;
            gData.stateStackTop = null;
            if (result) {
                gData.skipped = i - start;
                return true;
            }
        }
        return false;
    }

    /*
     * indexp is assumed to be an array of length 1
     */
    Object executeRegExp(Context cx, Scriptable scopeObj, RegExpImpl res,
                         String str, int indexp[], int matchType)
    {
        REGlobalData gData = new REGlobalData();

        int start = indexp[0];
        char[] charArray = str.toCharArray();
        int end = charArray.length;
        if (start > end)
            start = end;
        //
        // Call the recursive matcher to do the real work.
        //
        boolean matches = matchRegExp(gData, re, charArray, start, end,
                                      res.multiline);
        if (!matches) {
            if (matchType != PREFIX) return null;
            return Undefined.instance;
        }
        int index = gData.cp;
        int i = index;
        indexp[0] = i;
        int matchlen = i - (start + gData.skipped);
        int ep = index;
        index -= matchlen;
        Object result;
        Scriptable obj;

        if (matchType == TEST) {
            /*
             * Testing for a match and updating cx.regExpImpl: don't allocate
             * an array object, do return true.
             */
            result = Boolean.TRUE;
            obj = null;
        }
        else {
            /*
             * The array returned on match has element 0 bound to the matched
             * string, elements 1 through re.parenCount bound to the paren
             * matches, an index property telling the length of the left context,
             * and an input property referring to the input string.
             */
            Scriptable scope = getTopLevelScope(scopeObj);
            result = ScriptRuntime.newObject(cx, scope, "Array", null);
            obj = (Scriptable) result;

            String matchstr = new String(charArray, index, matchlen);
            obj.put(0, obj, matchstr);
        }

        if (re.parenCount == 0) {
            res.parens = null;
            res.lastParen = SubString.emptySubString;
        } else {
            SubString parsub = null;
            int num;
            res.parens = new SubString[re.parenCount];
            for (num = 0; num < re.parenCount; num++) {
                int cap_index = gData.parens_index(num);
                String parstr;
                if (cap_index != -1) {
                    int cap_length = gData.parens_length(num);
                    parsub = new SubString(charArray, cap_index, cap_length);
                    res.parens[num] = parsub;
                    if (matchType == TEST) continue;
                    parstr = parsub.toString();
                    obj.put(num+1, obj, parstr);
                }
                else {
                    if (matchType != TEST)
                        obj.put(num+1, obj, Undefined.instance);
                }
            }
            res.lastParen = parsub;
        }

        if (! (matchType == TEST)) {
            /*
             * Define the index and input properties last for better for/in loop
             * order (so they come after the elements).
             */
            obj.put("index", obj, new Integer(start + gData.skipped));
            obj.put("input", obj, str);
        }

        if (res.lastMatch == null) {
            res.lastMatch = new SubString();
            res.leftContext = new SubString();
            res.rightContext = new SubString();
        }
        res.lastMatch.charArray = charArray;
        res.lastMatch.index = index;
        res.lastMatch.length = matchlen;

        res.leftContext.charArray = charArray;
        if (cx.getLanguageVersion() == Context.VERSION_1_2) {
            /*
             * JS1.2 emulated Perl4.0.1.8 (patch level 36) for global regexps used
             * in scalar contexts, and unintentionally for the string.match "list"
             * psuedo-context.  On "hi there bye", the following would result:
             *
             * Language     while(/ /g){print("$`");}   s/ /$`/g
             * perl4.036    "hi", "there"               "hihitherehi therebye"
             * perl5        "hi", "hi there"            "hihitherehi therebye"
             * js1.2        "hi", "there"               "hihitheretherebye"
             *
             * Insofar as JS1.2 always defined $` as "left context from the last
             * match" for global regexps, it was more consistent than perl4.
             */
            res.leftContext.index = start;
            res.leftContext.length = gData.skipped;
        } else {
            /*
             * For JS1.3 and ECMAv2, emulate Perl5 exactly:
             *
             * js1.3        "hi", "hi there"            "hihitherehi therebye"
             */
            res.leftContext.index = 0;
            res.leftContext.length = start + gData.skipped;
        }

        res.rightContext.charArray = charArray;
        res.rightContext.index = ep;
        res.rightContext.length = end - ep;

        return result;
    }

    int getFlags()
    {
        return re.flags;
    }

    private static void reportWarning(Context cx, String messageId, String arg)
    {
        if (cx.hasFeature(Context.FEATURE_STRICT_MODE)) {
            String msg = ScriptRuntime.getMessage1(messageId, arg);
            Context.reportWarning(msg);
        }
    }

    private static void reportError(String messageId, String arg)
    {
        String msg = ScriptRuntime.getMessage1(messageId, arg);
        throw ScriptRuntime.constructError("SyntaxError", msg);
    }

// #string_id_map#

    private static final int
        Id_lastIndex    = 1,
        Id_source       = 2,
        Id_global       = 3,
        Id_ignoreCase   = 4,
        Id_multiline    = 5,

        MAX_INSTANCE_ID = 5;

    protected int getMaxInstanceId()
    {
        return MAX_INSTANCE_ID;
    }

    protected int findInstanceIdInfo(String s)
    {
        int id;
// #generated# Last update: 2007-05-09 08:16:24 EDT
        L0: { id = 0; String X = null; int c;
            int s_length = s.length();
            if (s_length==6) {
                c=s.charAt(0);
                if (c=='g') { X="global";id=Id_global; }
                else if (c=='s') { X="source";id=Id_source; }
            }
            else if (s_length==9) {
                c=s.charAt(0);
                if (c=='l') { X="lastIndex";id=Id_lastIndex; }
                else if (c=='m') { X="multiline";id=Id_multiline; }
            }
            else if (s_length==10) { X="ignoreCase";id=Id_ignoreCase; }
            if (X!=null && X!=s && !X.equals(s)) id = 0;
            break L0;
        }
// #/generated#
// #/string_id_map#

        if (id == 0) return super.findInstanceIdInfo(s);

        int attr;
        switch (id) {
          case Id_lastIndex:
            attr = PERMANENT | DONTENUM;
            break;
          case Id_source:
          case Id_global:
          case Id_ignoreCase:
          case Id_multiline:
            attr = PERMANENT | READONLY | DONTENUM;
            break;
          default:
            throw new IllegalStateException();
        }
        return instanceIdInfo(attr, id);
    }

    protected String getInstanceIdName(int id)
    {
        switch (id) {
            case Id_lastIndex:  return "lastIndex";
            case Id_source:     return "source";
            case Id_global:     return "global";
            case Id_ignoreCase: return "ignoreCase";
            case Id_multiline:  return "multiline";
        }
        return super.getInstanceIdName(id);
    }

    protected Object getInstanceIdValue(int id)
    {
        switch (id) {
          case Id_lastIndex:
            return ScriptRuntime.wrapNumber(lastIndex);
          case Id_source:
            return new String(re.source);
          case Id_global:
            return ScriptRuntime.wrapBoolean((re.flags & JSREG_GLOB) != 0);
          case Id_ignoreCase:
            return ScriptRuntime.wrapBoolean((re.flags & JSREG_FOLD) != 0);
          case Id_multiline:
            return ScriptRuntime.wrapBoolean((re.flags & JSREG_MULTILINE) != 0);
        }
        return super.getInstanceIdValue(id);
    }

    protected void setInstanceIdValue(int id, Object value)
    {
        if (id == Id_lastIndex) {
            lastIndex = ScriptRuntime.toNumber(value);
            return;
        }
        super.setInstanceIdValue(id, value);
    }

    protected void initPrototypeId(int id)
    {
        String s;
        int arity;
        switch (id) {
          case Id_compile:  arity=1; s="compile";  break;
          case Id_toString: arity=0; s="toString"; break;
          case Id_toSource: arity=0; s="toSource"; break;
          case Id_exec:     arity=1; s="exec";     break;
          case Id_test:     arity=1; s="test";     break;
          case Id_prefix:   arity=1; s="prefix";   break;
          default: throw new IllegalArgumentException(String.valueOf(id));
        }
        initPrototypeMethod(REGEXP_TAG, id, s, arity);
    }

    public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
                             Scriptable thisObj, Object[] args)
    {
        if (!f.hasTag(REGEXP_TAG)) {
            return super.execIdCall(f, cx, scope, thisObj, args);
        }
        int id = f.methodId();
        switch (id) {
          case Id_compile:
            return realThis(thisObj, f).compile(cx, scope, args);

          case Id_toString:
          case Id_toSource:
            return realThis(thisObj, f).toString();

          case Id_exec:
            return realThis(thisObj, f).execSub(cx, scope, args, MATCH);

          case Id_test: {
            Object x = realThis(thisObj, f).execSub(cx, scope, args, TEST);
            return Boolean.TRUE.equals(x) ? Boolean.TRUE : Boolean.FALSE;
          }

          case Id_prefix:
            return realThis(thisObj, f).execSub(cx, scope, args, PREFIX);
        }
        throw new IllegalArgumentException(String.valueOf(id));
    }

    private static NativeRegExp realThis(Scriptable thisObj, IdFunctionObject f)
    {
        if (!(thisObj instanceof NativeRegExp))
            throw incompatibleCallError(f);
        return (NativeRegExp)thisObj;
    }

// #string_id_map#
    protected int findPrototypeId(String s)
    {
        int id;
// #generated# Last update: 2007-05-09 08:16:24 EDT
        L0: { id = 0; String X = null; int c;
            L: switch (s.length()) {
            case 4: c=s.charAt(0);
                if (c=='e') { X="exec";id=Id_exec; }
                else if (c=='t') { X="test";id=Id_test; }
                break L;
            case 6: X="prefix";id=Id_prefix; break L;
            case 7: X="compile";id=Id_compile; break L;
            case 8: c=s.charAt(3);
                if (c=='o') { X="toSource";id=Id_toSource; }
                else if (c=='t') { X="toString";id=Id_toString; }
                break L;
            }
            if (X!=null && X!=s && !X.equals(s)) id = 0;
            break L0;
        }
// #/generated#
        return id;
    }

    private static final int
        Id_compile       = 1,
        Id_toString      = 2,
        Id_toSource      = 3,
        Id_exec          = 4,
        Id_test          = 5,
        Id_prefix        = 6,

        MAX_PROTOTYPE_ID = 6;

// #/string_id_map#

    private RECompiled re;
    double lastIndex;          /* index after last match, for //g iterator */

}       // class NativeRegExp

class RECompiled implements Serializable
{
    static final long serialVersionUID = -6144956577595844213L;

    char []source;          /* locked source string, sans // */
    int parenCount;         /* number of parenthesized submatches */
    int flags;              /* flags  */
    byte[] program;         /* regular expression bytecode */
    int classCount;         /* count [...] bitmaps */
    RECharSet[] classList;  /* list of [...] bitmaps */
    int anchorCh = -1;      /* if >= 0, then re starts with this literal char */
}

class RENode {

    RENode(byte op)
    {
        this.op = op;
    }

    byte            op;         /* r.e. op bytecode */
    RENode          next;       /* next in concatenation order */
    RENode          kid;        /* first operand */

    RENode          kid2;       /* second operand */
    int             num;        /* could be a number */
    int             parenIndex; /* or a parenthesis index */

                                /* or a range */
    int             min;
    int             max;
    int             parenCount;
    boolean         greedy;

                                /* or a character class */
    int             startIndex;
    int             kidlen;     /* length of string at kid, in chars */
    int             bmsize;     /* bitmap size, based on max char code */
    int             index;      /* index into class list */

                                /* or a literal sequence */
    char            chr;        /* of one character */
    int             length;     /* or many (via the index) */
    int             flatIndex;  /* which is -1 if not sourced */

}

class CompilerState {

    CompilerState(Context cx, char[] source, int length, int flags)
    {
        this.cx = cx;
        this.cpbegin = source;
        this.cp = 0;
        this.cpend = length;
        this.flags = flags;
        this.parenCount = 0;
        this.classCount = 0;
        this.progLength = 0;
    }

    Context     cx;
    char        cpbegin[];
    int         cpend;
    int         cp;
    int         flags;
    int         parenCount;
    int         parenNesting;
    int         classCount;   /* number of [] encountered */
    int         progLength;   /* estimated bytecode length */
    RENode      result;
}

class REProgState
{
    REProgState(REProgState previous, int min, int max, int index,
                REBackTrackData backTrack,
                int continuation_pc, int continuation_op)
    {
        this.previous = previous;
        this.min = min;
        this.max = max;
        this.index = index;
        this.continuation_op = continuation_op;
        this.continuation_pc = continuation_pc;
        this.backTrack = backTrack;
    }

    REProgState previous; // previous state in stack

    int min;                      /* current quantifier min */
    int max;                      /* current quantifier max */
    int index;                    /* progress in text */
    int continuation_op;
    int continuation_pc;
    REBackTrackData backTrack; // used by ASSERT_  to recover state
}

class REBackTrackData {

    REBackTrackData(REGlobalData gData, int op, int pc)
    {
        previous = gData.backTrackStackTop;
        continuation_op = op;
        continuation_pc = pc;
        lastParen = gData.lastParen;
        if (gData.parens != null) {
            parens = gData.parens.clone();
        }
        cp = gData.cp;
        stateStackTop = gData.stateStackTop;
    }

    REBackTrackData previous;

    int continuation_op;                /* where to backtrack to */
    int continuation_pc;
    int lastParen;
    long[] parens;                      /* parenthesis captures */
    int cp;                             /* char buffer index */
    REProgState stateStackTop;          /* state of op that backtracked */
}

class REGlobalData {
    boolean multiline;
    RECompiled regexp;              /* the RE in execution */
    int lastParen;                  /* highest paren set so far */
    int skipped;                    /* chars skipped anchoring this r.e. */

    int cp;                         /* char buffer index */
    long[] parens;                  /* parens captures */

    REProgState stateStackTop;       /* stack of state of current ancestors */

    REBackTrackData backTrackStackTop;  /* last matched-so-far position */


    /**
     * Get start of parenthesis capture contents, -1 for empty.
     */
    int parens_index(int i)
    {
        return (int)(parens[i]);
    }

    /**
     * Get length of parenthesis capture contents.
     */
    int parens_length(int i)
    {
        return (int)(parens[i] >>> 32);
    }

    void set_parens(int i, int index, int length)
    {
        parens[i] = (index & 0xffffffffL) | ((long)length << 32);
    }

}

/*
 * This struct holds a bitmap representation of a class from a regexp.
 * There's a list of these referenced by the classList field in the NativeRegExp
 * struct below. The initial state has startIndex set to the offset in the
 * original regexp source of the beginning of the class contents. The first
 * use of the class converts the source representation into a bitmap.
 *
 */
final class RECharSet implements Serializable
{
    static final long serialVersionUID = 7931787979395898394L;

    RECharSet(int length, int startIndex, int strlength)
    {
        this.length = length;
        this.startIndex = startIndex;
        this.strlength = strlength;
    }

    int length;
    int startIndex;
    int strlength;

    volatile transient boolean converted;
    volatile transient boolean sense;
    volatile transient byte[] bits;
}