Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/ChtmlTextWriter.cs

@@ -0,0 +1,193 @@
+//------------------------------------------------------------------------------
+// <copyright file="ChtmlTextWriter.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+// ChtmlTextWriter.cs
+//
+
+namespace System.Web.UI {
+    using System;
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.IO;
+    using System.Text;
+    using System.Web.UI.WebControls;
+    using System.Web.Util;
+    using System.Globalization;
+    using System.Security.Permissions;
+
+
+    /// <devdoc>
+    ///    <para>[To be supplied.]</para>
+    /// </devdoc>
+    public class ChtmlTextWriter : Html32TextWriter {
+        private Hashtable _recognizedAttributes = new Hashtable(StringComparer.CurrentCultureIgnoreCase);
+        private Hashtable _suppressedAttributes = new Hashtable(StringComparer.CurrentCultureIgnoreCase);
+        private Hashtable _globalSuppressedAttributes = new Hashtable(StringComparer.CurrentCultureIgnoreCase);
+
+
+        public ChtmlTextWriter(TextWriter writer) : this(writer, DefaultTabString) {
+        }
+
+
+        public ChtmlTextWriter(TextWriter writer, string tabString) : base(writer, tabString) {
+            _globalSuppressedAttributes["onclick"] = true;
+            _globalSuppressedAttributes["ondblclick"] = true;
+            _globalSuppressedAttributes["onmousedown"] = true;
+            _globalSuppressedAttributes["onmouseup"] = true;
+            _globalSuppressedAttributes["onmouseover"] = true;
+            _globalSuppressedAttributes["onmousemove"] = true;
+            _globalSuppressedAttributes["onmouseout"] = true;
+            _globalSuppressedAttributes["onkeypress"] = true;
+            _globalSuppressedAttributes["onkeydown"] = true;
+            _globalSuppressedAttributes["onkeyup"] = true;
+        
+            // Supress certain element attribute pairs that can happen when Html32TextWriter performs the div table
+            // substitution.
+            RemoveRecognizedAttributeInternal("div", "accesskey");    // VSWhidbey 270254
+            RemoveRecognizedAttributeInternal("div", "cellspacing");
+            RemoveRecognizedAttributeInternal("div", "cellpadding");
+            RemoveRecognizedAttributeInternal("div", "gridlines");
+            RemoveRecognizedAttributeInternal("div", "rules");
+
+            RemoveRecognizedAttributeInternal("span", "cellspacing");
+            RemoveRecognizedAttributeInternal("span", "cellpadding");
+            RemoveRecognizedAttributeInternal("span", "gridlines");
+            RemoveRecognizedAttributeInternal("span", "rules");
+        }
+
+
+        /// <devdoc>
+        /// <para>[To be supplied.]</para>
+        /// </devdoc>
+        public virtual void AddRecognizedAttribute(string elementName, string attributeName) {           
+            Hashtable eltAttributes = (Hashtable) _recognizedAttributes[elementName];
+            if (eltAttributes == null) {
+                eltAttributes = new Hashtable(StringComparer.CurrentCultureIgnoreCase);
+                _recognizedAttributes[elementName] = eltAttributes;
+            }
+            eltAttributes.Add(attributeName, true);
+        }
+        
+
+        /// <devdoc>
+        /// Override to filter out unnecessary attributes
+        /// </devdoc>
+        protected override bool OnAttributeRender(string name, string value, HtmlTextWriterAttribute key) {
+            Hashtable elementRecognizedAttributes = (Hashtable)_recognizedAttributes[TagName];
+            if (elementRecognizedAttributes != null && elementRecognizedAttributes[name] != null) {
+                return true;
+            }
+            
+            if (_globalSuppressedAttributes[name] != null) {
+                return false;
+            }
+            
+            Hashtable elementSuppressedAttributes = (Hashtable)_suppressedAttributes[TagName];
+            if (elementSuppressedAttributes != null && elementSuppressedAttributes[name] != null) {
+                return false;
+            }
+
+            return true;
+        }
+
+
+        protected override bool OnStyleAttributeRender(string name,string value, HtmlTextWriterStyle key) {
+            if (key == HtmlTextWriterStyle.TextDecoration) {
+                if (StringUtil.EqualsIgnoreCase("line-through", value)) {
+                    return false;
+                }
+            }
+            return base.OnStyleAttributeRender(name, value, key);
+        }
+
+
+        protected override bool OnTagRender(string name, HtmlTextWriterTag key) {
+            return  base.OnTagRender(name, key) && key != HtmlTextWriterTag.Span;
+        }
+
+
+        /// <devdoc>
+        /// <para>[To be supplied.]</para>
+        /// </devdoc>
+        public virtual void RemoveRecognizedAttribute(string elementName, string attributeName) { 
+            RemoveRecognizedAttributeInternal(elementName, attributeName);
+        }
+        
+        private void RemoveRecognizedAttributeInternal(string elementName, string attributeName) {
+            // Since recognized attributes have precedence, we need to do two operations: add this attribute
+            // to the suppressed list, and remove it from the recognized list.
+            Hashtable eltAttributes = (Hashtable) _suppressedAttributes[elementName];
+            if (eltAttributes == null) {
+                eltAttributes = new Hashtable(StringComparer.CurrentCultureIgnoreCase);
+                _suppressedAttributes[elementName] = eltAttributes;
+            }
+            eltAttributes.Add(attributeName, true);
+
+            eltAttributes = (Hashtable)_recognizedAttributes[elementName];
+            if (eltAttributes == null) {
+                eltAttributes = new Hashtable(StringComparer.CurrentCultureIgnoreCase);
+                _recognizedAttributes[elementName] = eltAttributes;
+            }
+            // Note: Hashtable::Remove silently continues if the key does not exist.
+            eltAttributes.Remove(attributeName);
+        }
+
+
+        public override void WriteBreak() {
+            Write("<br>");
+        }
+
+        public override void WriteEncodedText(String text) {
+            if (null == text || text.Length == 0) {
+                return;
+            }
+
+            int length = text.Length;
+            int start = -1;
+            for(int pos = 0; pos < length; pos++) {
+                int ch = text[pos];
+                if(ch > 160 && ch < 256) {
+                    if(start != -1) {
+                        base.WriteEncodedText(text.Substring(start, pos - start));
+                        start = -1;
+                    }
+                    base.Write(text[pos]);
+                }
+                else {
+                    if(start == -1) {
+                        start = pos;
+                    }
+                }
+            }
+            if(start != -1) {
+                if(start == 0) {
+                    base.WriteEncodedText(text);
+                }
+                else {
+                    base.WriteEncodedText(text.Substring(start, length - start));
+                }
+            }
+        }
+
+        protected Hashtable RecognizedAttributes {
+            get {
+                return _recognizedAttributes;
+            }
+        }
+
+        protected Hashtable SuppressedAttributes {
+            get {
+                return _suppressedAttributes;
+            }
+        }
+
+        protected Hashtable GlobalSuppressedAttributes {
+            get {
+                return _globalSuppressedAttributes;
+            }
+        }
+    }
+}