A non-well-formed HTML Parser and CSS Resolver

Download DOLS_HTML.zip - 364.6 KB (10:52, 07/21/2007, GMT +8)

demo:
Screenshot - demo.jpg

The program is very simple to demonstrate the function of library,
it is similar to demo program of MIL HTML Parser (http://www.codeproject.com/dotnet/apmilhtml.asp).

Introduction

This library produces a tree which like DOM tree of a given non-well-formed HTML document,
allowing the developer to read, compose, and modify the tree in a methodical way.
The library is based on MIL HTML Parser, and I try to improve the codepage
encoding problem, tolerance of tag missing, CSS Resolver and efficiency.

Background

This library was written to avoid having to convert a non-well-formed HTML
into XML prior to reading, whilst preserving the distinct HTML qualities.

Using the code

// Open HTML file "Google News.htm"
DOL.DHtml.DHtmlParser.DHtmlGeneralParser parser =
  new DOL.DHtml.DHtmlParser.DHtmlGeneralParser();
DOL.DHtml.DHtmlParser.DHtmlDocument htmlDoc =
  new DOL.DHtml.DHtmlParser.DHtmlDocument(parser);
htmlDoc.Load(@"..\Google News.htm");


//You can modify the HTML tree with htmlDoc.Nodes

htmlDoc.Save(@"..\Rebuild.htm");


// Dump the information about HTML tree in IDE debug output window
StringBuilder builder = new StringBuilder();
 htmlDoc.Dump(builder, ""); 
System.Diagnostics.Debug.Write("\n" + builder.ToString());

Debug Output information
├Object DHtmlDocument Dump :
│　DHtmlNode number: 6
│　Deep dump in the following:
│　│
│　├Object DHtmlComment Dump :
│　│　Node ID: 1
│　│　Comment content:
================================================
DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
================================================
│　│
│　├Object DHtmlText Dump :
│　│　Node ID: 2
│　│　Text content is white space
│　│
│　├Object DHtmlComment Dump :
│　│　Node ID: 3
│　│　Comment content:
================================================
saved from url=(0033)http://www.google.com/news?ned=us
================================================
│　│
│　├Object DHtmlText Dump :
│　│　Node ID: 4
│　│　Text content is white space
│　│
│　├Object DHtmlElement Dump :
│　│　Node ID: 5
│　│　HTML Tag: <html>
│　│　DHtmlNode number: 3
│　│　Child Object deep dump in the following:
│　│　│
│　│　├Object DHtmlElement Dump :
│　│　│　Node ID: 6
│　│　│　HTML Tag: <head>
│　│　│　DHtmlNode number: 30
│　│　│　Child Object deep dump in the following:
│　│　│　│
│　│　│　├Object DHtmlElement Dump :
│　│　│　│　Node ID: 7
│　│　│　│　HTML Tag: <title>
│　│　│　│　DHtmlNode number: 1
│　│　│　│　Child Object deep dump in the following:
│　│　│　│　│
│　│　│　│　├Object DHtmlText Dump :
│　│　│　│　│　Node ID: 8
│　│　│　│　│　Text content: "Google News"

Structural diagram

HTML Parser

CSS Resolver

History

2007/07/21 Modify to create a new StringBuilder instance in each method that needs one in DHtmlTextProcessor
2007/05/13 Added structural diagram
2007/05/01 Improved tolerance of of attribute structure error
2007/04/29 Fixed one bug about tag missing
2007/03/28 Updated demo program (Added CSS Resolver demo)
2007/03/27 Fixed one bug in initiation of DHtmlElement
2007/03/26
1. New demo program
2. Supported "Visitor Patten" in node hierarchy
2007/03/22　Initial release

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

James S.F. Hsieh

Web Developer

United States

Member

James S.F. Hsieh(Nomad Libra) Working as engineer for "Corel Intervideo" company situated in Taiwan.
He received his master degree in Graduate Institute of Network Learning Technology, National Central University, Taiwan in 2006.
His research interests are semantic Web services, intelligent software agent, machine learning, algorithm, software
engineering and multimedia programming.

Article Top

Poor

Excellent

Add a reason or comment to your vote: x
Votes of 3 or less require a comment

A non-well-formed HTML parser and CSS Resolver builded by pure .NET C#

Type	Article
Licence
First Posted	21 Mar 2007
Views	58,635
Bookmarked	56 times

.NET1.0.NET1.1
.NET2.0DotGNUC#1.0, +