Monday 28 June 2004 Arabica

Added a few little tweaks to the XPath grammar this evening. Just have to walk the abstract syntax tree the parser creates and build a nice little XPath object to do the work. Course, I have to write the code that would use ...

Also fixed XMLBaseSupport so it works properly in the face of the URLs which don't end with a / character. There are some implicit std::string dependencies in there too, but I'm not overly fussed about that right now. Using the XMLBaseSupport class is simplicity itself - create an instance, call it in your startElement and endElement handlers, and use its makeAbsolute member function when you want to a URI referenced relative to the current xml:base. Here's the business part of a little example that prints xlink:hrefs,

void hrefPrinter::startElement(const std::string&, const std::string& localName,
                               const std::string&, const SAX::Attributes& atts)
{
  xmlbaseTracker_.startElement(atts);

  std::string href = atts.getValue("http://www.w3.org/1999/xlink", "href");
  if(href.empty())
    return;

  std::cout << "href '" << href << "' resolves to the URI '"
            << xmlbaseTracker_.makeAbsolute(href)
            << "'" << std::endl;
} // startElement

void hrefPrinter::endElement(const std::string&, const std::string& localName,
                             const std::string&)
{
  xmlbaseTracker_.endElement();
} // endElement

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Tagged code, arabica, xml, and c++

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