steffenvan commented on code in PR #1443:
URL: https://github.com/apache/jackrabbit-oak/pull/1443#discussion_r1599549435
##########
oak-lucene/src/main/java/org/apache/lucene/util/automaton/RegExp.java:
##########
@@ -872,23 +874,39 @@ private boolean check(int flag) {
}
final RegExp parseUnionExp() throws IllegalArgumentException {
- RegExp e = parseInterExp();
- if (match('|')) e = makeUnion(e, parseUnionExp());
- return e;
+ return iterativeParseExp(this::parseInterExp, () -> match('|'),
RegExp::makeUnion);
}
final RegExp parseInterExp() throws IllegalArgumentException {
- RegExp e = parseConcatExp();
- if (check(INTERSECTION) && match('&')) e = makeIntersection(e,
- parseInterExp());
- return e;
+ return iterativeParseExp(
+ this::parseConcatExp, () -> check(INTERSECTION) && match('&'),
RegExp::makeIntersection);
}
final RegExp parseConcatExp() throws IllegalArgumentException {
- RegExp e = parseRepeatExp();
- if (more() && !peek(")|") && (!check(INTERSECTION) || !peek("&"))) e =
makeConcatenation(
- e, parseConcatExp());
- return e;
+ return iterativeParseExp(
+ this::parseRepeatExp,
+ () -> (more() && !peek(")|") && (!check(INTERSECTION) || !peek("&"))),
+ RegExp::makeConcatenation);
+ }
+
+ /**
+ * Custom Functional Interface for a Supplying methods with signature of
RegExp(RegExp
+ * exp1, RegExp exp2)
+ */
+ @FunctionalInterface
+ private interface MakeRegexGroup {
+ RegExp get(RegExp exp1, RegExp exp2);
+ }
+
+ final RegExp iterativeParseExp(
+ Supplier<RegExp> gather, BooleanSupplier stop, MakeRegexGroup
associativeReduce)
+ throws IllegalArgumentException {
+ RegExp result = gather.get();
+ while (stop.getAsBoolean() == true) {
Review Comment:
Hmm okay fair makes sense.
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