Re: Problem with CFXMLCreateStringByEscapingEntities to replace special xml chars?
Re: Problem with CFXMLCreateStringByEscapingEntities to replace special xml chars?
- Subject: Re: Problem with CFXMLCreateStringByEscapingEntities to replace special xml chars?
- From: Steven Kramer <email@hidden>
- Date: Tue, 2 Nov 2004 13:46:42 +0100
Op 17-okt-04 om 6:58 heeft Benjamin Levy het volgende geschreven:
Hello,
I've used CFXMLCreateStringByUnescapingEntities before with no
problems, but I'm getting a consistent but unexpected result with
CFXMLCreateStringByEscapingEntities now that I'm using it for the
first time. It seems that the returned string only includes up to the
last replaced entity and cuts the rest of the string out and if there
are no entities it returns an empty string.
NSString* a = @"one < two";
NSString* b = (NSString*)CFXMLCreateStringByEscapingEntities(
kCFAllocatorDefault, (CFStringRef)a, NULL );
NSLog( @"String \"%@\" became \"%@\"", a, b );
Results in: String "one < two" became "one <"
Not much comes up when searching for
CFXMLCreateStringByEscapingEntities, but is this a known behavior
and/or bug? Am I somehow doing something wrong here?
Benjamin,
I just checked the source for this function (in 10.3.5,
<http://darwinsource.opendarwin.org/10.3.5/CF-299.31/Parsing.subproj/
CFXMLParser.c>) and it is indeed badly broken. You're better off
writing a Cocoa replacement for now.
There are two problems:
1. the entities dictionary is ignored
2. you will get a correct substring up to and including the final
entity, but not what comes after
The very crude, very slow and mostly untested code below at least fixes
#2
Regards
Steven
@implementation NSString (CBEscapeXMLEntities)
- (NSString*) escapedString
{
NSMutableString* escaped = [[self mutableCopy] autorelease];// really,
really broken (NSString*) ::CFXMLCreateStringByEscapingEntities (nil,
(CFStringRef) self, nil);
[escaped replaceOccurrencesOfString: @"&" withString: @"&"
options: 0 range: NSMakeRange (0, [escaped length])];
[escaped replaceOccurrencesOfString: @"<" withString: @"<" options:
0 range: NSMakeRange (0, [escaped length])];
[escaped replaceOccurrencesOfString: @">" withString: @">" options:
0 range: NSMakeRange (0, [escaped length])];
[escaped replaceOccurrencesOfString: @"\"" withString: @"""
options: 0 range: NSMakeRange (0, [escaped length])];
return [escaped copy];
}
@end
--
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