> On Mar 24, 2017, at 10:59 AM, Tyler Stromberg via swift-dev > <swift-dev@swift.org> wrote: > > I'm currently working on integrating SourceKit with a macOS application. > AppKit APIs (e.g. NSAttributedString, NSLayoutManager, etc) deal in terms of > NSRange (UTF-16 code units?). SourceKit, however, deals in terms of integer > offsets and lengths (UTF-8 code units?).
UTF8 byte offsets > Is there a more efficient or easier way to convert back and forth between the > two other than doing the index(_:offsetBy:) -> samePosition(in:) dance? If you’re doing a bunch of queries in the same file, you could build a table of line start offsets in both UTF8 and UTF16 you may get faster results by going UTF8 offset -> UTF8 line + delta -> UTF16 line + delta -> UTF16 offset. Since then the expensive part is O(line length) instead of O(file size). I don’t know of a good canned solution. > _______________________________________________ > swift-dev mailing list > swift-dev@swift.org > https://lists.swift.org/mailman/listinfo/swift-dev _______________________________________________ swift-dev mailing list swift-dev@swift.org https://lists.swift.org/mailman/listinfo/swift-dev
