john-wagster commented on code in PR #14192:
URL: https://github.com/apache/lucene/pull/14192#discussion_r1940026321
##########
lucene/core/src/java/org/apache/lucene/util/automaton/RegExp.java:
##########
@@ -436,6 +478,160 @@ public enum Kind {
*/
@Deprecated public static final int DEPRECATED_COMPLEMENT = 0x10000;
+ /**
+ * See {@link #UNICODE_CASE_INSENSITIVE} for more details on the set of
known unstable alternative
+ * casings
+ */
+ static final Map<Integer, int[]> unstableUnicodeCharacters =
+ Map.ofEntries(
+ // these are the set of characters whose casing matches across
multiple characters
+ entry(181, new int[] {924, 956}),
+ entry(924, new int[] {181, 956}),
+ entry(956, new int[] {181, 924}),
+ entry(304, new int[] {105, 73, 305}),
+ entry(105, new int[] {304, 73, 305}),
+ entry(73, new int[] {304, 105, 305}),
+ entry(305, new int[] {304, 105, 73}),
+ entry(383, new int[] {83, 115}),
+ entry(83, new int[] {383, 115}),
+ entry(115, new int[] {383, 83}),
+ entry(837, new int[] {921, 953, 8126}),
+ entry(921, new int[] {837, 953, 8126}),
+ entry(953, new int[] {837, 921, 8126}),
+ entry(8126, new int[] {837, 921, 953}),
+ entry(962, new int[] {931, 963}),
+ entry(931, new int[] {962, 963}),
+ entry(963, new int[] {962, 931}),
+ entry(976, new int[] {914, 946}),
+ entry(914, new int[] {976, 946}),
+ entry(946, new int[] {976, 914}),
+ entry(977, new int[] {920, 952, 1012}),
+ entry(920, new int[] {977, 952, 1012}),
+ entry(952, new int[] {977, 920, 1012}),
+ entry(1012, new int[] {977, 920, 952}),
+ entry(981, new int[] {934, 966}),
+ entry(934, new int[] {981, 966}),
+ entry(966, new int[] {981, 934}),
+ entry(982, new int[] {928, 960}),
+ entry(928, new int[] {982, 960}),
+ entry(960, new int[] {982, 928}),
+ entry(1008, new int[] {922, 954}),
+ entry(922, new int[] {1008, 954}),
+ entry(954, new int[] {1008, 922}),
+ entry(1009, new int[] {929, 961}),
+ entry(929, new int[] {1009, 961}),
+ entry(961, new int[] {1009, 929}),
+ entry(1013, new int[] {917, 949}),
+ entry(917, new int[] {1013, 949}),
+ entry(949, new int[] {1013, 917}),
+ entry(7296, new int[] {1042, 1074}),
+ entry(1042, new int[] {7296, 1074}),
+ entry(1074, new int[] {7296, 1042}),
+ entry(7297, new int[] {1044, 1076}),
+ entry(1044, new int[] {7297, 1076}),
+ entry(1076, new int[] {7297, 1044}),
+ entry(7298, new int[] {1054, 1086}),
+ entry(1054, new int[] {7298, 1086}),
+ entry(1086, new int[] {7298, 1054}),
+ entry(7299, new int[] {1057, 1089}),
+ entry(1057, new int[] {7299, 1089}),
+ entry(1089, new int[] {7299, 1057}),
+ entry(7300, new int[] {1058, 1090, 7301}),
+ entry(1058, new int[] {7300, 1090, 7301}),
+ entry(1090, new int[] {7300, 1058, 7301}),
+ entry(7301, new int[] {7300, 1058, 1090}),
+ entry(7302, new int[] {1066, 1098}),
+ entry(1066, new int[] {7302, 1098}),
+ entry(1098, new int[] {7302, 1066}),
+ entry(7303, new int[] {1122, 1123}),
+ entry(1122, new int[] {7303, 1123}),
+ entry(1123, new int[] {7303, 1122}),
+ entry(7304, new int[] {42570, 42571}),
+ entry(42570, new int[] {7304, 42571}),
+ entry(42571, new int[] {7304, 42570}),
+ entry(7835, new int[] {7776, 7777}),
+ entry(7776, new int[] {7835, 7777}),
+ entry(7777, new int[] {7835, 7776}),
+ entry(8486, new int[] {969, 937}),
+ entry(969, new int[] {8486, 937}),
+ entry(937, new int[] {8486, 969}),
+ entry(8490, new int[] {107, 75}),
+ entry(107, new int[] {8490, 75}),
+ entry(75, new int[] {8490, 107}),
+ entry(8491, new int[] {229, 197}),
+ entry(229, new int[] {8491, 197}),
+ entry(197, new int[] {8491, 229}),
Review Comment:
good suggestion; let me poke around a bit more and see if I can somehow do
that. My intention was to follow Pattern not the Unicode spec (and let Pattern
follow some version of the spec) but it would be nice if there were obvious
sets that all of these fell into rather than this hardcoded mapping.
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