| public WriteAttribute ( MimeKit.Text.HtmlAttribute attribute ) : void | ||
| attribute | MimeKit.Text.HtmlAttribute | The attribute. |
| return | void | |
/// <summary>
/// Write the HTML tag.
/// </summary>
/// <remarks>
/// Writes the HTML tag to the given <see cref="HtmlWriter"/>.
/// </remarks>
/// <example>
/// <code language="c#" source="Examples\MimeVisitorExamples.cs" region="HtmlPreviewVisitor" />
/// </example>
/// <param name="htmlWriter">The HTML writer.</param>
/// <param name="writeAttributes"><c>true</c> if the <see cref="Attributes"/> should also be written; otherwise, <c>false</c>.</param>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="htmlWriter"/> is <c>null</c>.
/// </exception>
public void WriteTag(HtmlWriter htmlWriter, bool writeAttributes)
{
if (htmlWriter == null)
{
throw new ArgumentNullException(nameof(htmlWriter));
}
if (IsEndTag)
{
htmlWriter.WriteEndTag(TagName);
return;
}
if (IsEmptyElementTag)
{
htmlWriter.WriteEmptyElementTag(TagName);
}
else
{
htmlWriter.WriteStartTag(TagName);
}
if (writeAttributes)
{
for (int i = 0; i < Attributes.Count; i++)
{
htmlWriter.WriteAttribute(Attributes[i]);
}
}
}
public void HtmlTagCallback (HtmlTagContext ctx, HtmlWriter htmlWriter)
{
if (ctx.TagId != HtmlTagId.Image || ctx.IsEndTag) {
ctx.WriteTag (htmlWriter, true);
return;
}
// write the IMG tag, but don't write out the attributes.
ctx.WriteTag (htmlWriter, false);
// manually write the attributes so that we can replace the SRC attributes
foreach (var attribute in ctx.Attributes) {
if (attribute.Id == HtmlAttributeId.Src) {
int index;
Uri uri;
// parse the <img src=...> attribute value into a Uri
if (Uri.IsWellFormedUriString (attribute.Value, UriKind.Absolute))
uri = new Uri (attribute.Value, UriKind.Absolute);
else
uri = new Uri (attribute.Value, UriKind.Relative);
// locate the index of the attachment within the multipart/related (if it exists)
if ((index = related.IndexOf (uri)) != -1) {
var attachment = related[index] as MimePart;
if (attachment == null) {
// the body part is not a basic leaf part (IOW it's a multipart or message-part)
htmlWriter.WriteAttribute (attribute);
continue;
}
var data = GetDataUri (attachment);
htmlWriter.WriteAttributeName (attribute.Name);
htmlWriter.WriteAttributeValue (data);
} else {
htmlWriter.WriteAttribute (attribute);
}
}
}
}
void HtmlTagCallback(HtmlTagContext ctx, HtmlWriter htmlWriter)
{
if (ctx.TagId == HtmlTagId.Image && !ctx.IsEndTag && _stack.Count > 0)
{
ctx.WriteTag(htmlWriter, false);
// replace the src attribute with a file:// URL
foreach (var attribute in ctx.Attributes)
{
if (attribute.Id == HtmlAttributeId.Src)
{
MimePart image;
if (!TryGetImage(attribute.Value, out image))
{
htmlWriter.WriteAttribute(attribute);
continue;
}
var url = SaveImage(image, attribute.Value);
htmlWriter.WriteAttributeName(attribute.Name);
htmlWriter.WriteAttributeValue(url);
}
else
htmlWriter.WriteAttribute(attribute);
}
}
else if (ctx.TagId == HtmlTagId.Body && !ctx.IsEndTag)
{
ctx.WriteTag(htmlWriter, false);
// add and/or replace oncontextmenu="return false;"
foreach (var attribute in ctx.Attributes)
{
if (attribute.Name.ToLowerInvariant() == "oncontextmenu")
continue;
htmlWriter.WriteAttribute(attribute);
}
htmlWriter.WriteAttribute("oncontextmenu", "return false;");
}
else
{
// pass the tag through to the output
ctx.WriteTag(htmlWriter, true);
}
}
void ReplaceUrlsWithFileNames (HtmlTagContext ctx, HtmlWriter htmlWriter)
{
if (ctx.TagId == HtmlTagId.Image) {
htmlWriter.WriteEmptyElementTag (ctx.TagName);
ctx.DeleteEndTag = true;
for (int i = 0; i < ctx.Attributes.Count; i++) {
var attr = ctx.Attributes[i];
if (attr.Id == HtmlAttributeId.Src) {
var fileName = Path.GetFileName (attr.Value);
htmlWriter.WriteAttributeName (attr.Name);
htmlWriter.WriteAttributeValue (fileName);
} else {
htmlWriter.WriteAttribute (attr);
}
}
} else {
ctx.WriteTag (htmlWriter, true);
}
}
void HtmlTagCallback (HtmlTagContext ctx, HtmlWriter htmlWriter)
{
if (ctx.TagId == HtmlTagId.Body && !ctx.IsEmptyElementTag) {
if (ctx.IsEndTag) {
// end our opening <blockquote>
htmlWriter.WriteEndTag (HtmlTagId.BlockQuote);
// pass the </body> tag through to the output
ctx.WriteTag (htmlWriter, true);
} else {
// pass the <body> tag through to the output
ctx.WriteTag (htmlWriter, true);
// prepend the HTML reply with "On {DATE}, {SENDER} wrote:"
htmlWriter.WriteStartTag (HtmlTagId.P);
htmlWriter.WriteText (GetOnDateSenderWrote (message));
htmlWriter.WriteEndTag (HtmlTagId.P);
// Wrap the original content in a <blockquote>
htmlWriter.WriteStartTag (HtmlTagId.BlockQuote);
htmlWriter.WriteAttribute (HtmlAttributeId.Style, "border-left: 1px #ccc solid; margin: 0 0 0 .8ex; padding-left: 1ex;");
ctx.InvokeCallbackForEndTag = true;
}
} else {
// pass the tag through to the output
ctx.WriteTag (htmlWriter, true);
}
}
/// <summary>
/// Write the HTML tag.
/// </summary>
/// <remarks>
/// Writes the HTML tag to the given <see cref="HtmlWriter"/>.
/// </remarks>
/// <example>
/// <code language="c#" source="Examples\MimeVisitorExamples.cs" region="HtmlPreviewVisitor" />
/// </example>
/// <param name="htmlWriter">The HTML writer.</param>
/// <param name="writeAttributes"><c>true</c> if the <see cref="Attributes"/> should also be written; otherwise, <c>false</c>.</param>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="htmlWriter"/> is <c>null</c>.
/// </exception>
public void WriteTag (HtmlWriter htmlWriter, bool writeAttributes)
{
if (htmlWriter == null)
throw new ArgumentNullException ("htmlWriter");
if (IsEndTag) {
htmlWriter.WriteEndTag (TagName);
return;
}
if (IsEmptyElementTag)
htmlWriter.WriteEmptyElementTag (TagName);
else
htmlWriter.WriteStartTag (TagName);
if (writeAttributes) {
for (int i = 0; i < Attributes.Count; i++)
htmlWriter.WriteAttribute (Attributes[i]);
}
}
public void TestHtmlWriter ()
{
const string expected = "<html ltr=\"true\"><head/><body><p class=\"paragraph\">" +
"special characters in this text should get encoded: <>'&\n" +
"special characters should not get encoded: <>" +
"</p></body></html>";
var actual = new StringBuilder ();
using (var html = new HtmlWriter (new StringWriter (actual))) {
Assert.AreEqual (HtmlWriterState.Default, html.WriterState);
// make sure we can't start by writing an attribute since we are in the wrong state
Assert.Throws<InvalidOperationException> (() => html.WriteAttribute (new HtmlAttribute (HtmlAttributeId.Action, "invalid state")));
Assert.Throws<InvalidOperationException> (() => html.WriteAttribute (HtmlAttributeId.Action, "invalid state"));
Assert.Throws<InvalidOperationException> (() => html.WriteAttribute ("action", "invalid state"));
// write a tag
html.WriteStartTag (HtmlTagId.Html);
Assert.AreEqual (HtmlWriterState.Tag, html.WriterState);
// *now* we should be able to write an attribute
html.WriteAttribute (new HtmlAttribute ("ltr", "true"));
// write en empty element tag, this should change the state to Default
html.WriteEmptyElementTag (HtmlTagId.Head);
Assert.AreEqual (HtmlWriterState.Tag, html.WriterState);
html.WriteStartTag ("body");
Assert.AreEqual (HtmlWriterState.Tag, html.WriterState);
html.WriteStartTag (HtmlTagId.P);
Assert.AreEqual (HtmlWriterState.Tag, html.WriterState);
// make sure that we can't write an attribute value yet
Assert.Throws<InvalidOperationException> (() => html.WriteAttributeValue ("attrValue"));
Assert.Throws<InvalidOperationException> (() => html.WriteAttributeValue ("attrValue".ToCharArray (), 0, 9));
html.WriteAttributeName (HtmlAttributeId.Class);
Assert.AreEqual (HtmlWriterState.Attribute, html.WriterState);
html.WriteAttributeValue ("paragraph");
Assert.AreEqual (HtmlWriterState.Tag, html.WriterState);
html.WriteText ("special characters in this text should get encoded: <>'&\n");
html.WriteMarkupText ("special characters should not get encoded: <>");
Assert.AreEqual (HtmlWriterState.Default, html.WriterState);
html.WriteEndTag (HtmlTagId.P);
html.WriteEndTag (HtmlTagId.Body);
html.WriteEndTag ("html");
}
Assert.AreEqual (expected, actual.ToString ());
}
public void TestArgumentExceptions ()
{
Assert.Throws<ArgumentNullException> (() => new HtmlWriter (null, Encoding.UTF8));
Assert.Throws<ArgumentNullException> (() => new HtmlWriter (new MemoryStream (), null));
Assert.Throws<ArgumentNullException> (() => new HtmlWriter (null));
using (var html = new HtmlWriter (new StringWriter ())) {
Assert.Throws<ArgumentNullException> (() => html.WriteAttribute (null));
Assert.Throws<ArgumentNullException> (() => html.WriteAttribute (null, string.Empty));
Assert.Throws<ArgumentNullException> (() => html.WriteAttribute ("name", null));
Assert.Throws<ArgumentException> (() => html.WriteAttribute (string.Empty, null));
Assert.Throws<ArgumentException> (() => html.WriteAttribute ("a b c", null));
Assert.Throws<ArgumentNullException> (() => html.WriteAttribute (null, new char[1], 0, 1));
Assert.Throws<ArgumentNullException> (() => html.WriteAttribute ("name", null, 0, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteAttribute ("name", new char[0], -1, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteAttribute ("name", new char[0], 0, 1));
Assert.Throws<ArgumentException> (() => html.WriteAttribute (HtmlAttributeId.Unknown, new char[1], 0, 1));
Assert.Throws<ArgumentNullException> (() => html.WriteAttribute (HtmlAttributeId.Alt, null, 0, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteAttribute (HtmlAttributeId.Alt, new char[0], -1, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteAttribute (HtmlAttributeId.Alt, new char[0], 0, 1));
Assert.Throws<ArgumentException> (() => html.WriteAttributeName (HtmlAttributeId.Unknown));
Assert.Throws<ArgumentNullException> (() => html.WriteAttributeName (null));
Assert.Throws<ArgumentNullException> (() => html.WriteAttributeValue (null));
Assert.Throws<ArgumentNullException> (() => html.WriteAttributeValue (null, 0, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteAttributeValue (new char[0], -1, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteAttributeValue (new char[0], 0, 1));
Assert.Throws<ArgumentException> (() => html.WriteEmptyElementTag (HtmlTagId.Unknown));
Assert.Throws<ArgumentNullException> (() => html.WriteEmptyElementTag (null));
Assert.Throws<ArgumentException> (() => html.WriteEmptyElementTag (string.Empty));
Assert.Throws<ArgumentException> (() => html.WriteEmptyElementTag ("a b c"));
Assert.Throws<ArgumentException> (() => html.WriteEndTag (HtmlTagId.Unknown));
Assert.Throws<ArgumentNullException> (() => html.WriteEndTag (null));
Assert.Throws<ArgumentException> (() => html.WriteEndTag (string.Empty));
Assert.Throws<ArgumentException> (() => html.WriteEndTag ("a b c"));
Assert.Throws<ArgumentNullException> (() => html.WriteMarkupText (null));
Assert.Throws<ArgumentNullException> (() => html.WriteMarkupText (null, 0, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteMarkupText (new char[0], -1, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteMarkupText (new char[0], 0, 1));
Assert.Throws<ArgumentException> (() => html.WriteStartTag (HtmlTagId.Unknown));
Assert.Throws<ArgumentNullException> (() => html.WriteStartTag (null));
Assert.Throws<ArgumentException> (() => html.WriteStartTag (string.Empty));
Assert.Throws<ArgumentException> (() => html.WriteStartTag ("a b c"));
Assert.Throws<ArgumentNullException> (() => html.WriteText (null));
Assert.Throws<ArgumentNullException> (() => html.WriteText (null, 0, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteText (new char[0], -1, 0));
Assert.Throws<ArgumentOutOfRangeException> (() => html.WriteText (new char[0], 0, 1));
Assert.Throws<ArgumentNullException> (() => html.WriteToken (null));
}
}
