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

   1 //
   2 // ChtmlTextWriter.cs: Compact HTML
   3 //
   4 // Author:
   5 //      Cesar Lopez Nataren <cnataren@novell.com>
   6 //
   7
   8 //
   9 // Copyright (C) 2006-2010 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.IO;
  33 using System.Collections;
  34
  35 namespace System.Web.UI {
  36
  37         public class ChtmlTextWriter : Html32TextWriter
  38         {
  39                 static Hashtable global_suppressed_attrs;
  40
  41                 static string [] global_suppressed_attributes = {
  42                         "onclick", "ondblclick", "onmousedown", "onmouseup",
  43                         "onmouseover", "onmousemove", "onmouseout",
  44                         "onkeypress", "onkeydown", "onkeyup"
  45                 };
  46
  47                 static string [] recognized_attributes = {"div", "span"};
  48
  49                 Hashtable recognized_attrs = new Hashtable (recognized_attributes.Length);
  50                 Hashtable suppressed_attrs = new Hashtable (recognized_attributes.Length);
  51
  52                 static ChtmlTextWriter ()
  53                 {
  54                         SetupGlobalSuppressedAttrs (global_suppressed_attributes);
  55                 }
  56
  57                 static void SetupGlobalSuppressedAttrs (string [] attrs)
  58                 {
  59                         global_suppressed_attrs = new Hashtable ();
  60                         PopulateHash (global_suppressed_attrs, global_suppressed_attributes);
  61                 }
  62
  63                 static void PopulateHash (Hashtable hash, string [] keys)
  64                 {
  65                         foreach (string key in keys)
  66                                 hash.Add (key, true);
  67                 }
  68
  69                 public ChtmlTextWriter (TextWriter writer)
  70                         : this (writer, DefaultTabString)
  71                 {
  72                 }
  73
  74                 public ChtmlTextWriter (TextWriter writer, string tabString)
  75                         : base (writer, tabString)
  76                 {
  77                         //
  78                         // setup the recognized attrs
  79                         //
  80                         foreach (string key in recognized_attributes)
  81                                 recognized_attrs.Add (key, new Hashtable ());
  82
  83                         SetupSuppressedAttrs ();
  84                 }
  85
  86
  87                 void SetupSuppressedAttrs ()
  88                 {
  89                         //
  90                         // we don't make these static because they are not read-only
  91                         //
  92                         string [] div_suppressed_attributes = {
  93                                 "accesskey", "cellspacing", "cellpadding",
  94                                 "gridlines", "rules"
  95                         };
  96
  97                         string [] span_suppressed_attributes = {
  98                                 "cellspacing", "cellpadding",
  99                                 "gridlines", "rules"
 100                         };
 101
 102                         Init ("div", div_suppressed_attributes, suppressed_attrs);
 103                         Init ("span", span_suppressed_attributes, suppressed_attrs);
 104                 }
 105
 106                 static void Init (string key, string [] attrs, Hashtable container)
 107                 {
 108                         Hashtable attrs_hash = new Hashtable (attrs.Length);
 109                         PopulateHash (attrs_hash, attrs);
 110                         container.Add (key, attrs_hash);
 111                 }
 112
 113                 protected Hashtable GlobalSuppressedAttributes {
 114                         get { return global_suppressed_attrs; }
 115                 }
 116
 117                 protected Hashtable RecognizedAttributes {
 118                         get { return recognized_attrs; }
 119                 }
 120
 121                 protected Hashtable SuppressedAttributes {
 122                         get { return suppressed_attrs; }
 123                 }
 124
 125                 public virtual void AddRecognizedAttribute (string elementName, string attributeName)
 126                 {
 127                         Hashtable elem_attrs = (Hashtable) recognized_attrs [elementName];
 128
 129                         if (elem_attrs == null) {
 130                                 elem_attrs = new Hashtable ();
 131                                 elem_attrs.Add (attributeName, true);
 132                                 recognized_attrs.Add (elementName, elem_attrs);
 133                         } else
 134                                 elem_attrs.Add (attributeName, true);
 135                 }
 136
 137                 public virtual void RemoveRecognizedAttribute (string elementName, string attributeName)
 138                 {
 139                         Hashtable elem_attrs = (Hashtable) recognized_attrs [elementName];
 140
 141                         if (elem_attrs != null)
 142                                 elem_attrs.Remove (attributeName);
 143                 }
 144
 145                 //
 146                 // writes <br>
 147                 //
 148                 public override void WriteBreak ()
 149                 {
 150                         string br = GetTagName (HtmlTextWriterTag.Br);
 151                         WriteBeginTag (br);
 152                         Write (TagRightChar);
 153                 }
 154
 155                 public override void WriteEncodedText (string text)
 156                 {
 157                         base.WriteEncodedText (text);
 158                 }
 159
 160                 Hashtable attr_render = new Hashtable ();
 161
 162                 protected override bool OnAttributeRender (string name, string value, HtmlTextWriterAttribute key)
 163                 {
 164                         // FIXME:
 165                         // I checked every possible HtmlTextWriterAttribute key
 166                         // and always throws ArgumentNullException.
 167                         return (bool) attr_render [null];
 168                 }
 169
 170                 protected override bool OnStyleAttributeRender (string styleAttrName, string value, HtmlTextWriterStyle key)
 171                 {
 172                         return key == HtmlTextWriterStyle.Display;
 173                 }
 174
 175                 protected override bool OnTagRender (string name, HtmlTextWriterTag tag)
 176                 {
 177                         return tag != HtmlTextWriterTag.Span;
 178                 }
 179         }
 180 }