Development/Tutorials/Programming Tutorial KDE 3/KHTML

    From KDE TechBase

    For HTML parsing, you have the following possibilities:

    • QXML
    • QDOM
    • Perl
    • XHTML

    Obviously, QXML and QDOM need XML-compliant HTML pages, and the least HTML pages are XML-compliant. Perl is not the scope of this site. This tutorial chooses the XHTML approach.

    First step

    As we remember from http://developernew.kde.org/Development/Tutorials/Programming_Tutorial_KDE_4/How_to_write_an_HTML_parser, biggest thing is to be able to parse non-XML-conform syntax. It works with the following program.

    tags.cpp

    #include <kapplication.h>
    #include <kaboutdata.h>
    #include <kcmdlineargs.h>
    #include <dom/html_document.h>
    
    int main (int argc, char *argv[])
    {
            KAboutData aboutData( "test", "test",
            "1.0", "test", KAboutData::License_GPL,
            "(c) 2006" );
            KCmdLineArgs::init( argc, argv, &aboutData );
            KApplication khello;
    
            DOM::HTMLDocument doc;
            DOM::DOMString tag("*");
            DOM::DOMString uri("<html><body><a href=\"http://www.kde.org/\"></a><a href=\"/index.php\" nowrap>Log in</a><a href=\"http://www.gmx.de\"></a></body></html>");
    
            doc.loadXML(uri);
            kdDebug() << "Does this doc have child elements ? " << doc.hasChildNodes() << endl;
            for (int i=0; i<doc.getElementsByTagName(tag).length(); i++) kdDebug() << doc.getElementsByTagName(tag).item(i).nodeName().string() << endl;
            kdDebug() << "Size of your doc " << sizeof(doc.firstChild()) << endl;
            kdDebug() << doc.isHTMLDocument() << endl;
            kdDebug() << doc.toString().string() << endl;
    }
    


    Compile it like this:

    gcc -I/usr/lib/qt3/include -I/opt/kde3/include \
    -L/opt/kde3/lib -lkdeui -lkhtml -o tags tags.cpp
    

    Second

    #include <kapplication.h>
    #include <kaboutdata.h>
    #include <kcmdlineargs.h>
    #include <dom/html_document.h>
    #include <dom/html_element.h>
    #include <dom/dom_node.h>
    
    int main (int argc, char *argv[])
    {
            KAboutData aboutData( "test", "test",
            "1.0", "test", KAboutData::License_GPL,
            "(c) 2006" );
            KCmdLineArgs::init( argc, argv, &aboutData );
            KApplication khello;
    
            DOM::HTMLDocument doc;
            DOM::DOMString tag("*");
            DOM::DOMString uri("<html><body><a href=\"http://www.kde.org/\"><b>fat</b></a><a href=\"/index.php\" nowrap>Log in</a><a href=\"http://www.gmx.de\"></a></body></html>");
    
            doc.loadXML(uri);
            kdDebug() << "Here's a list of the document elements" << endl;
            for (int i=0; i<doc.getElementsByTagName(tag).length(); i++) kdDebug() << doc.getElementsByTagName(tag).item(i).nodeName().string() << endl;
           
            DOM::HTMLDocument doc2;
            DOM::DOMString uri2("<html><body>this is html<b>fat</b></body></html>");
            doc2.loadXML(uri2);
            kdDebug() << "This is the in-memory html:" << endl;
            kdDebug() << doc.toString().string() << endl;
            doc.body().insertBefore(doc.body().firstChild().firstChild(),doc.body().firstChild());
            kdDebug() << "Moving around nodes" << endl;
            kdDebug() << doc.toString().string() << endl;
    }