Re: How would you convert a \r to its UTF-8 counterpart ?

FROM : stephen joseph butler
DATE : Wed Jul 26 22:11:35 2006

2006/7/26, Stéphane Sudre <<email_removed>>:
> On mercredi, juillet 26, 2006, at 12:03  AM, Shawn Erickson wrote:
> > On Jul 25, 2006, at 2:20 PM, Stéphane Sudre wrote:
> >
> >> How would you convert a \r to its UTF-8 counterpart ?
> >
> > You may want to review what UTF-8 really is [1] since it has little to
> > do directly with what you are asking.
> >
> > \r is ASCII CR which is 0x0D in ASCII and in UTF-8.
> >
> > Anyway it looks like you are asking about character escaping in XML
> > (for example [2], [3]).
>
> Ok, I need to rephrase the question to use the proper terms.
>
> How can I save a string in a plist inside <string></string> tags so
> that the string is saved with character escaping for the '\r' (and
> probably '\n') characters?
>
> This is done automatically for the & character.


Have you given this a test as is? For example, in F-Script (a sort of
Objective-C scripting language) I tried this:

dict1 := NSDictionary dictionaryWithObjects:{'this is\r  a test\r',
'\r\rthis is another test\r\r'} forKeys:{'a', 'b'}
dict1 writeToFile:'/Users/foo/test.plist' atomically:true

dict2 := NSDictionary dictionaryWithContentsOfFile:'/Users/foo/test.plist'
dict2 objectForKey:'a'
dict2 objectForKey:'b'

Both printed out fine. If you take a look at the XML spec, it has this
to say about whitespace:

"An XML processor MUST always pass all characters in a document that
are not markup through to the application. A  validating XML processor
MUST also inform the application which of these characters constitute
white space appearing in element content."

So how whitespace is handled is entirely up to the application, it is
illegal for parsers to ignore it. Obviously, Apple has chosen to not
ignore it.