Douglas Davidson wrote:
On Jan 29, 2008, at 11:05 AM, Citizen wrote:
You could get close with generating the characters you expect to
find at the word boundaries with:
NSCharacterSet * wordBoundriesCharacterSet = [[NSCharacterSet
letterCharacterSet] invertedSet];
You would need to change this accordingly if you did not want
numbers to be considered as a word boundary. You could of course
create a boundary character set with just whitespace and punctuation
marks - it just depends on how you would like the final feature to
work.
It's better not to reinvent the wheel for this sort of tokenization.
There is API for word-boundary analysis in AppKit
(doubleClickAtIndex: et al.), and, starting in Leopard, also in
CoreFoundation (CFStringTokenizer), that handles this in a consistent
and standards-appropriate fashion.
The current find panel implementation works by searching for the
string in question using any appropriate NSString compare options,
then taking each result and determining whether it falls on word
boundaries. If a given occurrence doesn't have the right
word-boundary characteristics, the search continues.
Excellent, thank you for the information.
Actually, I've done a few brief tests with the Find panel (in Leopard)
and it appears to be fairly broken anyway :( Here's an example. Open
up TextEdit and, in a new document, type:
/this is a test.
/Now search for "is a" with "Full word" selected. It won't work. Or
search for "this " with a trailing space, or "test." with the trailing
period. It also won't work. As far as I can tell, "Full word" only
succeeds when you search for a /single word/ with no punctuation or
spaces of any kind. This is a little more limited than what I was
hoping for, so maybe I really do need to roll my own implementation.
Oh well, off to Radar to file a bug on the Find panel, and I'll figure
out some sort of solution. I can probably use NSCharacterSet or
something and look at the characters on either side of the found text.
I was hoping to avoid that, but it looks like I can't.
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/email@hidden
This email sent to email@hidden
