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Compare two version strings

/ Published in: Objective C
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  1. /*
  2.  * compareVersions(@"10.4",             @"10.3")             returns NSOrderedDescending (1)
  3.  * compareVersions(@"10.5",             @"10.5.0")           returns NSOrderedSame (0)
  4.  * compareVersions(@"10.4 Build 8L127", @"10.4 Build 8P135") returns NSOrderedAscending (-1)
  5.  */
  6. NSComparisonResult compareVersions(NSString* leftVersion, NSString* rightVersion)
  7. {
  8. 	int i;
  9.  
  10. 	// Break version into fields (separated by '.')
  11. 	NSMutableArray *leftFields  = [[NSMutableArray alloc] initWithArray:[leftVersion  componentsSeparatedByString:@"."]];
  12. 	NSMutableArray *rightFields = [[NSMutableArray alloc] initWithArray:[rightVersion componentsSeparatedByString:@"."]];
  13.  
  14. 	// Implict ".0" in case version doesn't have the same number of '.'
  15. 	if ([leftFields count] < [rightFields count]) {
  16. 		while ([leftFields count] != [rightFields count]) {
  17. 			[leftFields addObject:@"0"];
  18. 		}
  19. 	} else if ([leftFields count] > [rightFields count]) {
  20. 		while ([leftFields count] != [rightFields count]) {
  21. 			[rightFields addObject:@"0"];
  22. 		}
  23. 	}
  24.  
  25. 	// Do a numeric comparison on each field
  26. 	for(i = 0; i < [leftFields count]; i++) {
  27. 		NSComparisonResult result = [[leftFields objectAtIndex:i] compare:[rightFields objectAtIndex:i] options:NSNumericSearch];
  28. 		if (result != NSOrderedSame) {
  29. 			[leftFields release];
  30. 			[rightFields release];
  31. 			return result;
  32. 		}
  33. 	}
  34.  
  35. 	[leftFields release];
  36. 	[rightFields release];	
  37. 	return NSOrderedSame;
  38. }

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