118 lines
3.3 KiB
C#
118 lines
3.3 KiB
C#
/*
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* NReadability
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* http://code.google.com/p/nreadability/
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*
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* Copyright 2010 Marek Stój
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* http://immortal.pl/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Xml;
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using System.Xml.Linq;
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using ReadSharp.Ports.Sgml;
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using System.IO;
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namespace ReadSharp.Ports.NReadability
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{
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/// <summary>
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/// A class for constructing a DOM from HTML markup.
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/// </summary>
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public class SgmlDomBuilder
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{
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#region Public methods
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/// <summary>
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/// Constructs a DOM (System.Xml.Linq.XDocument) from HTML markup.
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/// </summary>
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/// <param name="htmlContent">HTML markup from which the DOM is to be constructed.</param>
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/// <returns>System.Linq.Xml.XDocument instance which is a DOM of the provided HTML markup.</returns>
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public XDocument BuildDocument(string htmlContent)
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{
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if (htmlContent == null)
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{
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throw new ArgumentNullException("htmlContent");
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}
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if (htmlContent.Trim().Length == 0)
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{
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return new XDocument();
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}
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// "trim end" htmlContent to ...</html>$ (codinghorror.com puts some scripts after the </html> - sic!)
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const string htmlEnd = "</html";
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int indexOfHtmlEnd = htmlContent.LastIndexOf(htmlEnd);
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if (indexOfHtmlEnd != -1)
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{
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int indexOfHtmlEndBracket = htmlContent.IndexOf('>', indexOfHtmlEnd);
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if (indexOfHtmlEndBracket != -1)
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{
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htmlContent = htmlContent.Substring(0, indexOfHtmlEndBracket + 1);
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}
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}
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XDocument document;
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try
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{
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document = LoadDocument(htmlContent);
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}
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catch (InvalidOperationException exc)
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{
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// sometimes SgmlReader doesn't handle <script> tags well and XDocument.Load() throws,
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// so we can retry with the html content with <script> tags stripped off
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if (!exc.Message.Contains("EndOfFile"))
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{
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throw;
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}
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htmlContent = HtmlUtils.RemoveScriptTags(htmlContent);
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document = LoadDocument(htmlContent);
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}
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return document;
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}
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private static XDocument LoadDocument(string htmlContent)
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{
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// I should not really do this, but I <3 WPCentral
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htmlContent = htmlContent.Replace("src=\"javascript:'<html ><head ></head ><body ></body ></html >'\"", "");
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using (var sgmlReader = new SgmlReader())
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{
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sgmlReader.CaseFolding = CaseFolding.ToLower;
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sgmlReader.DocType = "HTML";
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sgmlReader.WhitespaceHandling = WhitespaceHandling.None;
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using (var sr = new StreamReader(new MemoryStream(Encoding.UTF8.GetBytes(htmlContent))))
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{
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sgmlReader.InputStream = sr;
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var document = XDocument.Load(sgmlReader);
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return document;
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}
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}
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}
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#endregion
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}
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}
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