comparing HTMLDocuments

makuda · May 9th, 2006, 06:28 PM

Hi everybody!

I want to compare two HTML files. I don't want compare each sign, and I don't care about atributes. For example:

------- text 1 ---------

something
buhuhu

---- end of text 1 ----

------- text 2 ---------


something


 style="color: Red;">buhuhu
---- end of text 2 ----

These files are equal for me. I want use HTMLDocument class.

So I've got two HTMLDocuments and I want check if these trees are equal (don't care about attributes)

I don't know how to write function
bool compare(HTMLDocument, HTMLDocument)

Do you have any idea?

Thx for help

braindead · May 11th, 2006, 03:26 PM

If you can be sure that each html document is "well-formed", you could use the XmlTextReader and make this an amazingly simple task:

Given:

Doc 1:
<html>
<body>
 
 something
 
 
 buhuhu
 
</body>
</html>

Doc 2:
<html>
<body>
 something elsebuhuhu else
</body>
</html>

Try this little example in an aspx:

 XmlTextReader r1 = new XmlTextReader(Server.MapPath(<< doc 1 path >>));
 XmlTextReader r2 = new XmlTextReader(Server.MapPath(<< doc 2 path >>));

 Response.Write("<table border='1'>");
 Response.Write("<tr><th>Node Type</th></th>Node Name</th><th>Node Value</th></tr>");
 Response.Write("<tr><td colspan='3'>Doc 1</td></tr>");
 while (r1.Read())
 Response.Write("<tr><td>" + r1.NodeType + "</td><td>" + r1.Name + "</td><td>" + r1.Value + "</td></tr>");

 Response.Write ("<tr><td colspan='3'>Doc 2</td></tr>");
 while (r2.Read())
 Response.Write("<tr><td>" + r2.NodeType + "</td><td>" + r2.Name + "</td><td>" + r2.Value + "</td></tr>");
 Response.Write("</table>");

 r1.Close(); r1 = null;
 r2.Close(); r2 = null;

Brandon

bijgupt · May 24th, 2006, 07:08 AM

Hi all, Brandon ur code is fine but how it will compare the two.

Bijgupt

braindead · May 24th, 2006, 05:29 PM

XmlTextReader r1 = new XmlTextReader(Server.MapPath(<< doc 1 path >>));
 XmlTextReader r2 = new XmlTextReader(Server.MapPath(<< doc 2 path >>));

 bool files_equal = false;
 bool done = false;
 while (!done)
 {
 if (r1.Read() && r2.Read())
 {
 // Check that nodes are of the same depth, nodetype, name, valuetype and value.
 // All things being equal, the nodes should always be of the same depth since
 // we are sequentially looping through every node in each file at the same time.
 // However, it doesn't hurt to verify...

 // There are other properties you could check. This assumes that you don't care
 // about any attributes on any node.
 files_equal = (r1.Depth.Equals(r2.Depth)
 && r1.NodeType.Equals(r2.NodeType)
 && r1.Name.Equals(r2.Name)
 && r1.ValueType.Equals(r2.ValueType)
 && r1.Value.Equals(r2.Value));

 if (!files_equal)
 {
 // No need to keep checking if we find even one inequality.
 done = true;
 }
 }
 else
 {
 // If we reach the end of either file, then we are done.
 done = true;
 }
 }

 r1.Close(); r1 = null;
 r2.Close(); r2 = null;

 Response.Write ("Files are " + files_equal ? "equal" : "not equal.");

Brandon

braindead · May 24th, 2006, 05:30 PM

I forgot to say: That code was an example off the top of my head. I haven't actually tested it.

Brandon

bijgupt · May 25th, 2006, 08:00 AM

Nice piece of code . it works. Thanks

Bijgupt