Hi --
I'm getting some really odd behavior out of NSScanner; it seems to be
choking on character sets that only have whitespace in them.
This doesn't work:
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSString *test=@" ooxxdk";
NSCharacterSet *whiteSpaceCharSet=[NSCharacterSet
characterSetWithCharactersInString:@"\t\r\n "];
NSScanner *scanner=[NSScanner scannerWithString:test];
NSLog(@"location before: %d", [scanner scanLocation]);
BOOL result=[scanner scanCharactersFromSet:whiteSpaceCharSet
intoString:nil];
NSLog(@"location after: %d", [scanner scanLocation]);
NSLog(@"result returned: %d",result);
[pool drain];
return 0;
}
... it logs this:
2008-09-21 22:58:28.399 foo[804:10b] location before: 0
2008-09-21 22:58:28.401 foo[804:10b] location after: 0
2008-09-21 22:58:28.401 foo[804:10b] result returned: 0
I expected it to log something like this:
2008-09-21 23:01:31.357 foo[844:10b] location before: 0
2008-09-21 23:01:31.359 foo[844:10b] location after: 3
2008-09-21 23:01:31.360 foo[844:10b] result returned: 1
But, changing it like so:
NSString *test=@" aooxxdk";
NSCharacterSet *whiteSpaceCharSet=[[NSCharacterSet
characterSetWithCharactersInString:@"\t\r\n a"] retain];
does work... logging this:
2008-09-21 23:01:31.357 foo[844:10b] location before: 0
2008-09-21 23:01:31.359 foo[844:10b] location after: 4
2008-09-21 23:01:31.360 foo[844:10b] result returned: 1
I get similar results swapping tabs and/or cr's for the leading spaces
on the test string; as well as using the standard [NSCharacterSet
whitespaceAndNewlineCharacterSet].
Anybody have any ideas why this isn't working?
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