On 20/11/2008, at 3:13 PM, Mr. Gecko wrote:
How do I handle links with ../ for previous directory and / for
front of url.
I'm currently doing this:
// Example: [ @"/a/b/c/d" relativePathTo: @"/a/e/f/g/h"] => @"../../e/
f/g/h".
- (NSString*) relativePathTo: (NSString*) endPath
{
if([self isEqual: endPath])
{
return [self lastPathComponent];
}
NSArray* startComponents = [self pathComponents];
NSArray* endComponents = [endPath pathComponents];
NSMutableArray* resultComponents = nil;
int prefixCount = 0;
if( ! [self isEqual: endPath] ){
int iLen = MIN([startComponents count], [endComponents count]);
for(prefixCount = 0; prefixCount < iLen && [[startComponents
objectAtIndex: prefixCount] isEqual: [endComponents objectAtIndex:
prefixCount]]; ++prefixCount){}
}
if(0 == prefixCount){
resultComponents = [NSMutableArray arrayWithArray:
endComponents];
}else{
resultComponents = [NSMutableArray arrayWithArray: [endComponents
subarrayWithRange: NSMakeRange(prefixCount, [endComponents count] -
prefixCount)]];
int lifterCount = [startComponents count] - prefixCount;
if(1 == lifterCount){
//[resultComponents insertObject: @"." atIndex: 0];
}else{
--lifterCount;
int i = 0;
for(i = 0; i < lifterCount; ++i){
[resultComponents insertObject: @".." atIndex:
0];
}
}
}
return [NSString pathWithComponents: resultComponents];
}
--
Rob Keniger
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