A whole while loop reduced to one line. Very cool.
Thanks also for the tip on setCharactersToBeSkipped:nil.
That was driving me nuts.
On May 7, 2009, at 1:13 AM, Graham Cox wrote:
On 07/05/2009, at 3:05 PM, Daniel Child wrote:
I'm trying to catch whitespace between words with a scanner. For
some reason, the white space is not being recognized.
Am I missing something obvious or is there a bug here? Thanks.
{
NSMutableArray *separateWords;
NSScanner *scanner;
NSCharacterSet *spaceCharSet;
NSString *oneWord, *whiteSpace;
unichar whiteSpaceChar;
spaceCharSet = [NSCharacterSet whitespaceCharacterSet];
separateWords = [NSMutableArray array];
whiteSpace = [NSString stringWithString: @""];
scanner = [NSScanner scannerWithString: words]; // words IS A
PASSED IN STRING THAT CONTAINS SPACES AND TABS
while (![scanner isAtEnd]) {
[scanner scanUpToCharactersFromSet: spaceCharSet intoString:
&oneWord];
[separateWords addObject: oneWord];
[scanner scanCharactersFromSet: spaceCharSet intoString:
&whiteSpace]; // whiteSpace SHOULD RECEIVE SPACES/TABS HERE
if ([whiteSpace isEqualToString: @" "]) {
NSLog(@"We caught a space.\n"); // NEVER GETS CAUGHT EVEN THOUGH
words DEFINITELY HAS SPACES
}
if (whiteSpace) {
whiteSpaceChar = [whiteSpace characterAtIndex: 0];
if ((whiteSpaceChar == 0x0020) || (whiteSpaceChar == 0x0009))
{ // SPACE OR TAB
[separateWords addObject: whiteSpace];
whiteSpace = @""; // need to reset to blank or it will keep
accumulating characters
}
}
}
....
}
Ran into this myself the other day - NSScanner is set to ignore
whitespace characters by default, so you need to add [scanner
setCharactersToBeSkipped:nil] after creating the scanner.
If you just want to split a string into words though, and you can
target 10.5 or later, you can use the NSString method:
- (NSArray *) componentsSeparatedByCharactersInSet:(NSCharacterSet
*)separator
--Graham
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