Extracting xml fragment from QXmlStreamReader

[Gopala Krishna]

I recently started using xml in my app and i fell prey to QXmlStream* classes.
So far i found it really good and easy, but i came across a situation where i had to extract a fragment of xml from a xml document.
To be precise i want to extract svg embedded in xml so that i can construct QGraphicsSvgItems.
Is there a way to do this using QXmlStreamReader class ?
Currently i use dom to get the fragment but this is tedious as well as double work.
I am also open to suggestion regarding any special kind of embedding svg to enable it to be extracted .

P.S: Opening an external svg is already possible, i just need to add an option for embedded svgs.

[Gopala Krishna]

No other solution is it ?
Ok atleast i'll remove this question from unanswered list by posting now

[jacek]

Ok atleast i'll remove this question from unanswered list by posting now

Hey, that's cheating!

Maybe you should send a suggestion to the Trolls that such functionality might be useful?

[Gopala Krishna]

Hey, that's cheating!

Maybe you should send a suggestion to the Trolls that such functionality might be useful?

Ok, i tried to suggest but i can only report bug in task-tracker. Is suggestions only acceptable from customers ?

[jpn]

Is suggestions only acceptable from customers ?

No, anyone can send both bug reports and suggestions.

[Gopala Krishna]

Good that i haven't yet suggested because i found a solution for this.. Yippe!!

Here is the code for anyone interested..

QString readXmlFragment(QXmlStreamReader *reader)
{
   // Make sure reader is at starting element
   Q_ASSERT(reader->isStartElement());
 
   //The string to be returned containing xml fragment.
   QString retVal;
 
   QXmlStreamWriter writer(&retVal);
   writer.setCodec("UTF-8");
 
   //write the current token which is start element.
   writer.writeCurrentToken(*reader);
 
   //Store the tag name of start element.
   QString startName = reader->name().toString();
 
   // Now keep writing all tokens till end tag corresponding to startName is obtained.
   while(!reader->atEnd()) {
      reader->readNext();
      if(reader->isEndElement() && reader->name() == startName)
         break;
      writer.writeCurrentToken(*reader);
   }
   //write the end tag now
   writer.writeCurrentToken(*reader);
 
   //return the fragment
   return retVal;
}

QString readXmlFragment(QXmlStreamReader *reader)
{
   // Make sure reader is at starting element
   Q_ASSERT(reader->isStartElement());
   
   //The string to be returned containing xml fragment.
   QString retVal;

   QXmlStreamWriter writer(&retVal);
   writer.setCodec("UTF-8");

   //write the current token which is start element.
   writer.writeCurrentToken(*reader);

   //Store the tag name of start element.
   QString startName = reader->name().toString();

   // Now keep writing all tokens till end tag corresponding to startName is obtained.
   while(!reader->atEnd()) {
      reader->readNext();
      if(reader->isEndElement() && reader->name() == startName)
         break;
      writer.writeCurrentToken(*reader);
   }
   //write the end tag now
   writer.writeCurrentToken(*reader);

   //return the fragment
   return retVal;
}

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There seems to be one small quirk though. The empty elements of type

<sometag a="A" />

<sometag a="A" />

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will be written as

<sometag a="A"></sometag>

<sometag a="A"></sometag>

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which should not be a problem in 99.99% of cases