Latest revision as of 21:54, 29 June 2011

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.

[edit] 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

[edit] 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;
}

@@ Line 2: / Line 2: @@
 * QXML
 * QDOM
-* perl
+* Perl
-* khtml
+* 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. So, this tutorial choses the khtml approach. Our first khtml-program does plain nothing:
+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.
-<highlightSyntax language="cpp">
-#include <qstring.h>
+=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'''
+<syntaxhighlight lang="cpp-qt" line>
 #include <kapplication.h>
 #include <kaboutdata.h>
-#include <kmessagebox.h>
 #include <kcmdlineargs.h>
 #include <dom/html_document.h>
@@ Line 20: / Line 23: @@
          KCmdLineArgs::init( argc, argv, &aboutData );
          KApplication khello;
-         DOM::HTMLDocument();
+         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;
 }
-</highlightSyntax>
+</syntaxhighlight>
-It can be compiled like:
+Compile it like this:
   gcc -I/usr/lib/qt3/include -I/opt/kde3/include \
-  -L/opt/kde3/lib -lkdeui -lkhtml -o khtml khtml.cpp
+  -L/opt/kde3/lib -lkdeui -lkhtml -o tags tags.cpp
-<highlightSyntax language="cpp">
+=Second=
+<syntaxhighlight lang="cpp-qt">
 #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",
+        KAboutData aboutData( "test", "test",
-  "1.0", "test", KAboutData::License_GPL,
+        "1.0", "test", KAboutData::License_GPL,
-  "(c) 2006" );
+        "(c) 2006" );
-  KCmdLineArgs::init( argc, argv, &aboutData );
+        KCmdLineArgs::init( argc, argv, &aboutData );
-  KApplication khello;
+        KApplication khello;
-  DOM::Document doc=DOM::Document();
+        DOM::HTMLDocument doc;
-  DOM::HTMLDocument htmldoc=DOM::HTMLDocument();
+        DOM::DOMString tag("*");
-  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("hello.htm");
-  kdDebug() << "Does this doc have child elements ? " << doc.hasChildNodes() << endl;
+        doc.loadXML(uri);
-  kdDebug() << "First child node name: " << doc.firstChild().nodeName().string() << endl;
+        kdDebug() << "Here's a list of the document elements" << endl;
-  kdDebug() << "First grandchild node name: " << doc.firstChild().firstChild().nodeName().string() << endl;
+        for (int i=0; i<doc.getElementsByTagName(tag).length(); i++) kdDebug() << doc.getElementsByTagName(tag).item(i).nodeName().string() << endl;
-  kdDebug() << "Count of elements in your doc " << doc.getElementsByTagName(tag).length()<< endl;
-  kdDebug() << "Size of your doc " << sizeof(doc) << 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;
 }
-</highlightSyntax>
+</syntaxhighlight>
-You can use this e.g. with the following
-hello.htm:
-<pre>
-<html>
-<head>
-<title>blah</title>
-</head>
-<body>
-<b>fat</b>
-<a href="http://www.de">denic</a>
-</body>
-</html>
-</pre>

Difference between revisions of "Development/Tutorials/Programming Tutorial KDE 3/KHTML"

Latest revision as of 21:54, 29 June 2011

[edit] First step

[edit] Second