RFR: 8291660: Grapheme support in BreakIterator

[Stuart Marks]

On Tue, 23 Aug 2022 22:44:13 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> This is to enhance the character break analysis in `java.text.BreakIterator` to conform to the extended grapheme cluster boundaries defined in https://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries. A corresponding CSR has also been drafted, as there will be behavioral changes with this modification.

src/java.base/share/classes/sun/util/locale/provider/BreakIteratorProviderImpl.java line 258:

> 256:                     .filter(i -> boundaries.get(i) > offset)
> 257:                     .findFirst()
> 258:                     .orElse(boundaries.size() - 1);

Is it worth trying to use Collections.binarySearch() here? I think the boundaries list is in ascending sorted order, so you might be able to drop in a binarySearch() call directly. (Need to be a bit careful with negative return values.)

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PR: https://git.openjdk.org/jdk/pull/9991