[bugs #3301] NSScanner can't scan ']' properly ?

[Richard Frith-Macdonald]

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/**************************************************************************/
[bugs #3301] Latest Modifications:

Changes by: 
                Richard Frith-Macdonald <rfm@gnu.org>
'Date: 
                Tue 08/24/04 at 08:26 (GMT)

            What     | Removed                   | Added
---------------------------------------------------------------------------
         Assigned to | CaS                       | None







/**************************************************************************/
[bugs #3301] Full Item Snapshot:

URL: <http://savannah.gnu.org/bugs/?func=detailitem&item_id=3301>
Project: GNUstep
Submitted by: Yen-Ju Chen
On: Tue 04/22/03 at 12:52

Category:  Base/Foundation
Severity:  5 - Average
Item Group:  Bug
Resolution:  Invalid
Privacy:  Public
Assigned to:  None
Status:  Declined


Summary:  NSScanner can't scan ']' properly ? 

Original Submission:  I try to use NSScanner to count the number of '{', '}', 
'[', ']', 'n', etc., 
and the result is unexpected. 
It happens specially for ']' and ')'. 
Below is a test code. 
Did I do something wrong ? 
I also try scanString rather than scanUpToString, and it got worse. 
Is there any  limitation for NSScanner, such as special character ? 

Thanx. 

Yen-Ju 

#include <AppKit/AppKit.h> 

int main(int argc, const char *argv[]) 
{ 
  NSAutoreleasePool *pool = [NSAutoreleasePool new]; 

  NSString *string = [NSString stringWithContentsOfFile: @"NSMatrix.m"]; 
  NSScanner *scanner = [NSScanner scannerWithString: string]; 
  NSString *ch = @"["; 
  BOOL result = YES; 
  unsigned location = 0; 
  unsigned total = 0; 

  while(result) 
   { 
     [scanner setScanLocation: location]; 
     result = [scanner scanUpToString: ch intoString: NULL]; 
     location = [scanner scanLocation]; 
     if (location >= [string length]) 
       break; 
     location++; 
     total++ 
   } 

  NSLog(@"total %d", total); 

  RELEASE(pool); 
  return 0; 
} 


Follow-up Comments
------------------


-------------------------------------------------------
Date: Fri 04/25/03 at 06:35         By: Richard Frith-Macdonald <CaS>
Not a bug in NSScanner, which is performing correctly and as documented. I did 
commit a small change to the documentation in CVS in the hope of clarifying, 
but it was already quite clear.

Here is an example of how the code should have been written if the idea was to 
count the number of ocurrances of a a string in a file.

#include <Foundation/Foundation.h> 

int main(int argc, const char *argv[]) 
{ 
  NSAutoreleasePool *pool = [NSAutoreleasePool new]; 

  NSString *string = [NSString stringWithContentsOfFile: @"NSMatrix.m"]; 
  NSScanner *scanner = [NSScanner scannerWithString: string]; 
  NSString *ch = @"["; 
  unsigned total = 0; 

  [scanner scanUpToString: ch intoString: NULL]; 
  while ([scanner scanString: ch intoString: NULL] == YES)
   { 
     total++;
     [scanner scanUpToString: ch intoString: NULL]; 
   } 

  NSLog(@"total %d", total); 

  RELEASE(pool); 
  return 0; 
} 


-------------------------------------------------------
Date: Tue 04/22/03 at 15:19         By: Richard Frith-Macdonald <CaS>
Not a bug in NSScanner, which is performing correctly and as documented. I did 
commit a small change to the documentation in CVS in the hope of clarifying, 
but it was already quite clear.

Here is an example of how the code should have been written if the idea was to 
count the number of ocurrances of a a string in a file.

#include <Foundation/Foundation.h> 

int main(int argc, const char *argv[]) 
{ 
  NSAutoreleasePool *pool = [NSAutoreleasePool new]; 

  NSString *string = [NSString stringWithContentsOfFile: @"NSMatrix.m"]; 
  NSScanner *scanner = [NSScanner scannerWithString: string]; 
  NSString *ch = @"["; 
  unsigned total = 0; 

  [scanner scanUpToString: ch intoString: NULL]; 
  while ([scanner scanString: ch intoString: NULL] == YES)
   { 
     total++;
     [scanner scanUpToString: ch intoString: NULL]; 
   } 

  NSLog(@"total %d", total); 

  RELEASE(pool); 
  return 0; 
} 













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