Remove contents between script and style tags in Objective-C - objective-c

Question

Alright, so I am working on a web crawler that can take webpages and convert them into passages of text. To remove the tags themselves, I found this on Stack Overflow:
- (NSString *) stripTags:(NSString *)str
{
NSMutableString *ms = [NSMutableString stringWithCapacity:[str length]];
NSScanner *scanner = [NSScanner scannerWithString:str];
[scanner setCharactersToBeSkipped:nil];
NSString *s = nil;
while (![scanner isAtEnd])
{
[scanner scanUpToString:#"<" intoString:&s];
if (s != nil)
[ms appendString:s];
[scanner scanUpToString:#">" intoString:NULL];
if (![scanner isAtEnd])
[scanner setScanLocation:[scanner scanLocation]+1];
s = nil;
}
return ms;
}
And it works, however, it only removes the tags, not the contents between script and style tags (as obviously I don't want the contents between all tags to be removed as that would result in an empty string).
Is there any way I can have specifically the script and style tags truncated?
Thanks a lot in advance.
EDIT:
I have tried changing my code to:
- (NSString *) stripTags:(NSString *)str
{
NSMutableString *ms = [NSMutableString stringWithCapacity:[str length]];
NSScanner *scanner = [NSScanner scannerWithString:str];
[scanner setCharactersToBeSkipped:nil];
NSString *s = nil;
while (![scanner isAtEnd])
{
[scanner scanUpToString:#"<script" intoString:&s];
if (s != nil)
[ms appendString:s];
[scanner scanUpToString:#"script>" intoString:NULL];
if (![scanner isAtEnd])
[scanner setScanLocation:[scanner scanLocation]+1];
[scanner scanUpToString:#"<" intoString:&s];
if (s != nil)
[ms appendString:s];
[scanner scanUpToString:#">" intoString:NULL];
if (![scanner isAtEnd])
[scanner setScanLocation:[scanner scanLocation]+1];
s = nil;
}
return ms;
}
but the scripts and css is still being included

Answer 1

You can edit the scanner code so that you can check the tags. If the tag is one you want to remove then you can scan to the closing tag and just discard the string. You not then you can store / append the string.
Read up to the tag start (<)' then read the tag so you can check what it is. Then read to the tag close and either drop it or save it.
Start with something like (typed inline and not tested in any way):
while (![scanner isAtEnd])
{
[scanner scanUpToString:#"<" intoString:&s];
if (s != nil)
[ms appendString:s];
[scanner scanUpToString:#">" intoString:&t];
if ([t isEqualToString:#"tagToIgnore"]) {
[scanner scanUpToString:#"<" intoString:NULL];
[scanner setScanLocation:[scanner scanLocation]-1];
s = nil;
t = nil;
continue;
}
if (![scanner isAtEnd])
[scanner setScanLocation:[scanner scanLocation]+1];
s = nil;
t = nil;
}