ChtmlTextWriter.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » UI » C# / CSharp Open Source

//
// ChtmlTextWriter.cs: Compact HTML
//
// Author:
//  Cesar Lopez Nataren <cnataren@novell.com>
//

//
// Copyright (C) 2006-2010 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.IO;
using System.Collections;

namespace System.Web.UI{

  public class ChtmlTextWriter : Html32TextWriter
  {
    static Hashtable global_suppressed_attrs;

    static string [] global_suppressed_attributes = {
      "onclick", "ondblclick", "onmousedown", "onmouseup",
      "onmouseover", "onmousemove", "onmouseout",
      "onkeypress", "onkeydown", "onkeyup"
    };

    static string [] recognized_attributes = {"div", "span"};

    Hashtable recognized_attrs = new Hashtable (recognized_attributes.Length);
    Hashtable suppressed_attrs = new Hashtable (recognized_attributes.Length);

    static ChtmlTextWriter ()
    {
      SetupGlobalSuppressedAttrs (global_suppressed_attributes);
    }

    static void SetupGlobalSuppressedAttrs (string [] attrs)
    {
      global_suppressed_attrs = new Hashtable ();
      PopulateHash (global_suppressed_attrs, global_suppressed_attributes);
    }

    static void PopulateHash (Hashtable hash, string [] keys)
    {
      foreach (string key in keys)
        hash.Add (key, true);
    }

    public ChtmlTextWriter (TextWriter writer)
      : this (writer, DefaultTabString)
    {
    }

    public ChtmlTextWriter (TextWriter writer, string tabString)
      : base (writer, tabString)
    {
      //
      // setup the recognized attrs
      //
      foreach (string key in recognized_attributes)
        recognized_attrs.Add (key, new Hashtable ());

      SetupSuppressedAttrs ();
    }


    void SetupSuppressedAttrs ()
    {
      //
      // we don't make these static because they are not read-only
      //
      string [] div_suppressed_attributes = {
        "accesskey", "cellspacing", "cellpadding",
        "gridlines", "rules"
      };

      string [] span_suppressed_attributes = {
        "cellspacing", "cellpadding",
        "gridlines", "rules"
      };

      Init ("div", div_suppressed_attributes, suppressed_attrs);
      Init ("span", span_suppressed_attributes, suppressed_attrs);
    }

    static void Init (string key, string [] attrs, Hashtable container)
    {
      Hashtable attrs_hash = new Hashtable (attrs.Length);
      PopulateHash (attrs_hash, attrs);
      container.Add (key, attrs_hash);
    }

    protected Hashtable GlobalSuppressedAttributes {
      get { return global_suppressed_attrs; }
    }

    protected Hashtable RecognizedAttributes {
      get { return recognized_attrs; }
    }

    protected Hashtable SuppressedAttributes {
      get { return suppressed_attrs; }
    }

    public virtual void AddRecognizedAttribute (string elementName, string attributeName)
    {
      Hashtable elem_attrs = (Hashtable) recognized_attrs [elementName];

      if (elem_attrs == null) {
        elem_attrs = new Hashtable ();
        elem_attrs.Add (attributeName, true);
        recognized_attrs.Add (elementName, elem_attrs);
      } else
        elem_attrs.Add (attributeName, true);
    }

    public virtual void RemoveRecognizedAttribute (string elementName, string attributeName)
    {
      Hashtable elem_attrs = (Hashtable) recognized_attrs [elementName];

      if (elem_attrs != null)
        elem_attrs.Remove (attributeName);
    }

    //
    // writes <br>
    //
    public override void WriteBreak ()
    {
      string br = GetTagName (HtmlTextWriterTag.Br);
      WriteBeginTag (br);
      Write (TagRightChar);
    }

    public override void WriteEncodedText (string text)
    {
      base.WriteEncodedText (text);
    }

    Hashtable attr_render = new Hashtable ();

    protected override bool OnAttributeRender (string name, string value, HtmlTextWriterAttribute key)
    {
      // FIXME:
      // I checked every possible HtmlTextWriterAttribute key
      // and always throws ArgumentNullException.
      return (bool) attr_render [null];
    }

    protected override bool OnStyleAttributeRender (string styleAttrName, string value, HtmlTextWriterStyle key)
    {
      return key == HtmlTextWriterStyle.Display;
    }

    protected override bool OnTagRender (string name, HtmlTextWriterTag tag)
    {
      return tag != HtmlTextWriterTag.Span;
    }
  }
}