[MacRuby-devel] UTF8 Strings

[Robert Rice]

Hi Laurent:

Can't comment on NSXMLDocument but I have been using REXML with MacRuby without any problems. Great job!

Bob Rice


On Dec 6, 2009, at 3:43 PM, s.ross wrote:

> Laurent--
> 
> Sorry to be pesty about this XML thing, but I have Objective-C like this:
> 
>  NSString* xml = @"<people><person><name>steve</name><address>123 main</address></person><person><name>bob</name><address>345 First</address></person></people>";
>  NSError* error = [NSError alloc];
>  NSXMLDocument* xmlDoc = [[NSXMLDocument alloc] initWithXMLString:xml options:NSXMLDocumentTidyXML error:&error];
>  NSLog(@"Created XML Document %@", xmlDoc);
>  NSLog(@"Root element is %@", [xmlDoc rootElement]);
> 
>  NSArray* nodes = [xmlDoc nodesForXPath:@"//person" error:&error];
>  NSLog(@"nodes are %@", nodes);
>  for(int i = 0; i < [nodes count]; i++) {
>    NSXMLElement* node = [nodes objectAtIndex:i];
>    NSLog(@"Node %d is %@", i, node);
>    NSArray *name = [[node nodesForXPath:@"//name" error:&error] objectAtIndex:0];
>    NSArray *address = [[node nodesForXPath:@"//address" error:&error] objectAtIndex:0];
>    NSLog(@"Name: %@", [name stringValue]);
>    NSLog(@"Address: %@", [address stringValue]);
>  }
> }
> 
> Which behaves exactly as one might expect. It creates an XML document on which I can apply XPath queries. Using the nightly build from 5-December, the following MacRuby is different:
> 
> error = Pointer.new_with_type("@")
> s = NSMutableString.new("<people><person><name>steve</name><address>123 main</address></person><person><name>bob</name><address>345 First</address></person></people>")
> xmlDoc = NSXMLDocument.alloc.initWithData(s, options:1 << 10, error:error) <== Fails 
> NSLog("Created XML Document %@", xmlDoc)
> NSLog("Root element is %@", xmlDoc.rootElement)
> 
> This produces the output:
> 
> initializing
> <people><person><name>steve</name><address>123 main</address></person><person><name>bob</name><address>345 First</address></person></people>
> 2009-12-06 12:39:50.318 macruby[5229:903] Created XML Document 
> 2009-12-06 12:39:50.321 macruby[5229:903] Root element is (null)
> 
> Note the following:
> 
> * initWithString is simply unrecognized as a method
> * NSXMLDocumentTidyXML constant is not defined so I just transcribed the equivalent bitshift
> * The resultant XML document is null
> 
> I'm not filing this as a bug because I think it might be a failure on my part to understand how this set of methods maps onto MacRuby.
> 
> Thanks,
> 
> Steve
> 
> 
> On Dec 5, 2009, at 4:22 PM, Laurent Sansonetti wrote:
> 
>> Hi Steve,
>> 
>> On Dec 5, 2009, at 1:45 PM, s.ross wrote:
>> 
>>> My code receives XML data from a Web Service API call that is in UTF8 encoding. This winds up in a string.
>>> 
>>>   return_data = NSURLConnection.sendSynchronousRequest(@request, returningResponse: response, error: error)
>>>   str = NSString.alloc.initWithData(return_data, encoding: NSUTF8StringEncoding)
>>>   puts "******* response encoding it #{str.encoding}"
>>> 
>>> The result of the puts above is 'MACINTOSH'.
>>> 
>>> I suspect the encoding of the string is not UTF-8, because when I try to parse the XML using REXML, I get:
>>> 
>>> RegexpError: too short multibyte code
>>> 
>>> This occurs way in REXML:
>>> 
>>> /Library/Frameworks/MacRuby.framework/Versions/0.5/usr/lib/ruby/1.9.0/rexml/text.rb:132:in `check:'
>>> 
>>> In any case, my questions are:
>>> 
>>> 1) If anyone has run across this what did you do?
>> 
>> I don't believe REXML works. In any case, I would recommend to not use it. Since you're already using Cocoa, why not giving NSXMLDocument a try?
>> 
>>> 2) Why might the encoding be MACINTOSH and not UTF-8, as specified in the initWithData method call?
>> 
>> #encoding returns the fastest encoding available for the receiver. You may specify UTF-8 during the string creation, but if Cocoa can pick a smaller encoding at runtime (like ASCII) it will.
>> 
>> This is different from the Ruby 1.9 semantics and we have a plan to fix that in 0.6.
>> 
>>> 3) Suggestions?
>> 
>> See my comment in 1) :)
>> 
>> Laurent
>> _______________________________________________
>> MacRuby-devel mailing list
>> MacRuby-devel at lists.macosforge.org
>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
> 
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