Syntax Highlighting in Cocoa TextView? Experiences? Suggestions? Ideas?

Possible Duplicate:
Syntax coloring for Cocoa app

I'm interested in syntax highlighting in a Cocoa TextView.

I found several resources:

• approach with flex, via a flex pattern matched against textStorageDidProcessEditing in a TextView delegate. In this approach the whole string get parsed on each input event, hence performance degrades.

• CocoaDev has an own page on the topic of syntax highlighting:

  1. Use NSTextStorageDidProcessEditingNotification, then get the edited range, and just apply the coloring there. The range might be wordboundaries or anything; this definitely improves performance.

  2. Mentioned there: Xcode, for example, only colorizes text that's currently on-screen, and defers colorizing the rest of the document until you scroll through it. How would one implement this?

  3. Use NSLayoutManager – via Temporary attributes [which] are used only for on-screen drawing and are not persistent in any way... as the docs say, but that doesn't color the last edited range, until a whitespace character is entered.

  4. Custom Helper like UKSyntaxColoredDocument – nice, but language definition is done via property list; how to use additional/existing language definitions?

None of the approaches seem r