protected override void OnTagProcessed(HtmlGenericControl tag)
{
HtmlImage image = new HtmlImage();
image.Src = tag.Attributes["src"];
if (BaseHref != null)
{
image.Src = HtmlUriExtractor.TryCreate(BaseHref, image.Src);
}
image.Alt = tag.Attributes["alt"];
int width = 0;
if (int.TryParse(tag.Attributes["width"], out width))
{
image.Width = width;
}
int height = 0;
if (int.TryParse(tag.Attributes["height"], out height))
{
image.Height = height;
}
mImages.Add(image);
}
public static List <Uri> Extract(string html, Uri root)
{
HtmlUriExtractor ex = new HtmlUriExtractor(html, root);
while (!ex.EOF)
{
ex.Read();
}
return(ex.Uris);
}
protected override bool OnAttributeFound(ref string name, ref string value)
{
switch (name.ToLower())
{
case "src":
case "href":
if (BaseHref != null)
{
value = HtmlUriExtractor.TryCreate(BaseHref, value);
}
break;
}
return(base.OnAttributeFound(ref name, ref value));
}
public override bool Read()
{
bool status = base.Read();
if (status)
{
switch (base.NodeType)
{
case XmlNodeType.EndElement:
if (mObjectControls.Count < 1)
{
break;
}
if (mInsideObject && base.Name.ToLower() == mInsideObjectName)
{
mEmbeds.Add(mCurrent);
mInsideObject = false;
break;
}
HtmlControl top = mObjectControls.Pop();
break;
case XmlNodeType.Element:
bool fObject = false;
bool fSize = false;
switch (base.Name.ToLower())
{
case "object":
case "embed":
fSize = true;
if (!mInsideObject)
{
mInsideObjectName = base.Name;
mInsideObject = fObject = true;
}
break;
}
if (!mInsideObject)
{
break;
}
HtmlGenericControl embed = new HtmlGenericControl(base.Name);
for (int i = 0; i < AttributeCount; i++)
{
string name = GetAttributeName(i);
string value = GetAttribute(i);
switch (name.ToLower())
{
case "src":
if (BaseHref != null)
{
value = HtmlUriExtractor.TryCreate(BaseHref, value);
}
break;
case "height":
case "width":
if (!fSize)
{
continue;
}
break;
case "style":
continue;
}
embed.Attributes.Add(name, value);
}
if (fSize)
{
// width and height
Size size = new Size(242, 200);
//try
//{
// Size current = new Size(int.Parse(GetAttribute("width")), int.Parse(GetAttribute("height")));
// size = ThumbnailBitmap.GetNewSize(current, size);
//}
//catch
//{
//}
embed.Attributes["height"] = size.Height.ToString();
embed.Attributes["width"] = size.Width.ToString();
}
if (fObject)
{
mCurrent = embed;
}
else if (mObjectControls.Count > 0)
{
mObjectControls.Peek().Controls.Add(embed);
}
mObjectControls.Push(embed);
break;
}
}
return(status);
}
public override void WriteAttributes(XmlReader reader, bool defattr)
{
if (reader == null)
{
throw new ArgumentNullException("reader");
}
if ((reader.NodeType == XmlNodeType.Element) || (reader.NodeType == XmlNodeType.XmlDeclaration))
{
if (reader.MoveToFirstAttribute())
{
this.WriteAttributes(reader, defattr);
reader.MoveToElement();
}
}
else
{
if (reader.NodeType != XmlNodeType.Attribute)
{
throw new XmlException("Xml_InvalidPosition");
}
do
{
if (defattr || !reader.IsDefault)
{
string attributename = reader.LocalName.ToLower();
this.WriteStartAttribute(reader.Prefix, reader.LocalName, reader.NamespaceURI);
while (reader.ReadAttributeValue())
{
if (reader.NodeType == XmlNodeType.EntityReference)
{
this.WriteEntityRef(reader.Name);
continue;
}
string value = reader.Value;
if (BaseHref != null &&
LastStartElement == "a" &&
attributename == "href")
{
value = HtmlUriExtractor.TryCreate(
BaseHref, reader.Value, value);
}
if (BaseHref != null &&
(LastStartElement == "img" || LastStartElement == "embed") &&
attributename == "src")
{
value = HtmlUriExtractor.TryCreate(
BaseHref, reader.Value, value);
}
this.WriteString(value);
}
this.WriteEndAttribute();
}
} while (reader.MoveToNextAttribute());
}
}
public static List<Uri> Extract(string html, Uri root)
{
HtmlUriExtractor ex = new HtmlUriExtractor(html, root);
while (!ex.EOF) ex.Read();
return ex.Uris;
}
/// <summary>
/// This method is overriden to filter out attributes which are not allowed
/// </summary>
public override void WriteAttributes(XmlReader reader, bool defattr)
{
if (Options.FilterOutput)
{
// The following code is copied from implementation of XmlWriter's
// WriteAttributes method.
if (reader == null)
{
throw new ArgumentNullException("reader");
}
if ((reader.NodeType == XmlNodeType.Element) || (reader.NodeType == XmlNodeType.XmlDeclaration))
{
if (reader.MoveToFirstAttribute())
{
WriteAttributes(reader, defattr);
reader.MoveToElement();
}
}
else
{
if (reader.NodeType != XmlNodeType.Attribute)
{
throw new XmlException("Xml_InvalidPosition");
}
do
{
if (defattr || !reader.IsDefault)
{
string attributename = reader.LocalName.ToLower();
// Check if the attribute is allowed
bool canWrite = true;
switch (LastStartElement)
{
case "embed":
canWrite = true;
break;
case "img":
if (Options.RewriteImgSize.HasValue &&
Options.RewriteImgSize.Value.Width <= 0 &&
Options.RewriteImgSize.Value.Height <= 0 &&
(attributename == "width" || attributename == "height"))
{
canWrite = false;
}
break;
default:
canWrite = (Array.IndexOf(Options.AllowedAttributes, attributename) >= 0);
break;
}
// If allowed, write the attribute
if (canWrite)
{
WriteStartAttribute(reader.Prefix, reader.LocalName, reader.NamespaceURI);
}
while (reader.ReadAttributeValue())
{
if (reader.NodeType == XmlNodeType.EntityReference)
{
if (canWrite)
{
WriteEntityRef(reader.Name);
}
continue;
}
if (canWrite)
{
string value = reader.Value;
if (Options.BaseHref != null &&
LastStartElement == "a" &&
attributename == "href")
{
value = HtmlUriExtractor.TryCreate(
Options.BaseHref, reader.Value, value);
}
if (Options.BaseHref != null &&
(LastStartElement == "img" || LastStartElement == "embed") &&
attributename == "src")
{
value = HtmlUriExtractor.TryCreate(
Options.BaseHref, reader.Value, value);
}
if (Options.RewriteImgSrc != null &&
LastStartElement == "img" &&
attributename == "src")
{
value = Options.RewriteImgSrc.ToString().Replace("{url}",
Renderer.UrlEncode(value));
}
else if (Options.RewriteImgSize.HasValue &&
LastStartElement == "img" &&
attributename == "width")
{
value = Options.RewriteImgSize.Value.Width.ToString();
}
else if (Options.RewriteImgSize.HasValue &&
LastStartElement == "img" &&
attributename == "height")
{
value = Options.RewriteImgSize.Value.Height.ToString();
}
if (LastStartElement == "link" &&
attributename == "rel")
{
switch (value.ToLower())
{
case "stylesheet":
value = "stylesheet-stripped";
break;
}
}
WriteString(value);
}
}
if (canWrite)
{
WriteEndAttribute();
}
}
} while (reader.MoveToNextAttribute());
}
}
else
{
base.WriteAttributes(reader, defattr);
}
}
