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XamlToHtmlConverter.cs
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// adapted from https://github.com/mmanela/MarkupConverter
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Text;
using System.Xml;
namespace Rtf2HtmlMod
{
public class XamlToHtmlConverter
{
private ZipArchive _zip;
private XmlTextReader _xamlReader;
private HtmlResult _htmlResult;
private string _contentUriPrefix = string.Empty;
public bool AsFullDocument { get; set; }
public string ContentUriPrefix
{
get { return _contentUriPrefix; }
set
{
_contentUriPrefix = value ?? string.Empty;
if (!string.IsNullOrWhiteSpace(_contentUriPrefix) && !_contentUriPrefix.EndsWith("/"))
_contentUriPrefix += "/";
}
}
public XamlToHtmlConverter() { AsFullDocument = true; }
public HtmlResult ConvertXamlToHtml(MemoryStream xamlPackageStream)
{
using (_zip = new ZipArchive(xamlPackageStream))
{
var entry = _zip.GetEntry(@"Xaml/Document.xaml");
using (var stream = entry.Open())
using (var reader = new StreamReader(stream))
{
var xaml = reader.ReadToEnd();
_htmlResult = new HtmlResult();
ConvertXamlToHtml(xaml);
return _htmlResult;
}
}
}
private void ConvertXamlToHtml(string xamlString)
{
var safeXaml = WrapIntoFlowDocument(xamlString);
_xamlReader = new XmlTextReader(new StringReader(safeXaml));
var htmlStringBuilder = new StringBuilder(100);
var htmlWriter = new XmlTextWriter(new StringWriter(htmlStringBuilder));
if (!WriteFlowDocument(htmlWriter))
return;
_htmlResult.Html = htmlStringBuilder.ToString();
}
private static string WrapIntoFlowDocument(string xamlString)
{
if (string.IsNullOrWhiteSpace(xamlString)) return string.Empty;
if (xamlString.StartsWith("<FlowDocument")) return xamlString;
return
string.Concat(
"<FlowDocument xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\">",
xamlString,
"</FlowDocument>");
}
private bool WriteFlowDocument(XmlTextWriter htmlWriter)
{
// Xaml content is empty - nothing to convert
if (!ReadNextToken())
return false;
// Root FlowDocument element is missing
if (_xamlReader.NodeType != XmlNodeType.Element || _xamlReader.Name != "FlowDocument")
return false;
// Create a buffer StringBuilder for collecting css properties for inline STYLE attributes
// on every element level (it will be re-initialized on every level).
var inlineStyle = new StringBuilder();
if (AsFullDocument)
{
htmlWriter.WriteStartElement("html");
WriteHead(htmlWriter);
htmlWriter.WriteStartElement("body");
}
WriteFormattingProperties(htmlWriter, inlineStyle);
WriteElementContent(htmlWriter, inlineStyle);
if (AsFullDocument)
{
htmlWriter.WriteEndElement();
htmlWriter.WriteEndElement();
}
return true;
}
private static void WriteHead(XmlWriter htmlWriter)
{
htmlWriter.WriteStartElement("head");
htmlWriter.WriteStartElement("meta");
htmlWriter.WriteAttributeString("http-equiv", "Content-Type");
htmlWriter.WriteAttributeString("content", "text/html; charset=UTF-8");
htmlWriter.WriteEndElement();
htmlWriter.WriteEndElement();
}
private void WriteFormattingProperties(XmlWriter htmlWriter, StringBuilder inlineStyle)
{
Debug.Assert(_xamlReader.NodeType == XmlNodeType.Element);
// Clear string builder for the inline style
inlineStyle.Remove(0, inlineStyle.Length);
if (!_xamlReader.HasAttributes)
return;
var borderSet = false;
while (_xamlReader.MoveToNextAttribute())
{
string css = null;
switch (_xamlReader.Name)
{
// Character fomatting properties
// ------------------------------
case "Background":
css = "background-color:" + ParseXamlColor(_xamlReader.Value) + ";";
break;
case "FontFamily":
css = "font-family:" + _xamlReader.Value + ";";
break;
case "FontStyle":
css = "font-style:" + _xamlReader.Value.ToLower() + ";";
break;
case "FontWeight":
css = "font-weight:" + _xamlReader.Value.ToLower() + ";";
break;
case "FontStretch":
break;
case "FontSize":
css = "font-size:" + _xamlReader.Value + ";";
break;
case "Foreground":
css = "color:" + ParseXamlColor(_xamlReader.Value) + ";";
break;
case "TextDecorations":
css = _xamlReader.Value.ToLower() == "strikethrough" ? "text-decoration:line-through;" : "text-decoration:underline;";
break;
case "TextEffects":
break;
case "Emphasis":
break;
case "StandardLigatures":
break;
case "Variants":
break;
case "Capitals":
break;
case "Fraction":
break;
// Paragraph formatting properties
// -------------------------------
case "Padding":
css = "padding:" + ParseXamlThickness(_xamlReader.Value) + ";";
break;
case "Margin":
css = "margin:" + ParseXamlThickness(_xamlReader.Value) + ";";
break;
case "BorderThickness":
css = "border-width:" + ParseXamlThickness(_xamlReader.Value) + ";";
borderSet = true;
break;
case "BorderBrush":
css = "border-color:" + ParseXamlColor(_xamlReader.Value) + ";";
borderSet = true;
break;
case "LineHeight":
break;
case "TextIndent":
css = "text-indent:" + _xamlReader.Value + ";";
break;
case "TextAlignment":
css = "text-align:" + _xamlReader.Value + ";";
break;
case "IsKeptTogether":
break;
case "IsKeptWithNext":
break;
case "ColumnBreakBefore":
break;
case "PageBreakBefore":
break;
case "FlowDirection":
break;
// Table/Image attributes
// ----------------
case "Width":
css = "width:" + _xamlReader.Value + ";";
break;
case "Height":
css = "height:" + _xamlReader.Value + ";";
break;
case "ColumnSpan":
htmlWriter.WriteAttributeString("colspan", _xamlReader.Value);
break;
case "RowSpan":
htmlWriter.WriteAttributeString("rowspan", _xamlReader.Value);
break;
// Hyperlink Attributes
case "NavigateUri":
htmlWriter.WriteAttributeString("href", _xamlReader.Value);
break;
case "TargetName":
htmlWriter.WriteAttributeString("target", _xamlReader.Value);
break;
}
if (css != null)
inlineStyle.Append(css);
}
if (borderSet)
inlineStyle.Append("border-style:solid;mso-element:para-border-div;");
// Return the xamlReader back to element level
_xamlReader.MoveToElement();
Debug.Assert(_xamlReader.NodeType == XmlNodeType.Element);
}
private static string ParseXamlColor(string color)
{
// Remove transparency value
if (color.StartsWith("#"))
color = "#" + color.Substring(3);
return color;
}
private static string ParseXamlThickness(string thickness)
{
var values = thickness.Split(',');
for (var i = 0; i < values.Length; i++)
{
if (double.TryParse(values[i], NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out double value))
values[i] = Math.Ceiling(value).ToString(CultureInfo.InvariantCulture);
else
values[i] = "1";
}
string cssThickness;
switch (values.Length)
{
case 1:
cssThickness = thickness;
break;
case 2:
cssThickness = values[1] + " " + values[0];
break;
case 4:
cssThickness = values[1] + " " + values[2] + " " + values[3] + " " + values[0];
break;
default:
cssThickness = values[0];
break;
}
return cssThickness;
}
private void WriteElementContent(XmlTextWriter htmlWriter, StringBuilder inlineStyle)
{
Debug.Assert(_xamlReader.NodeType == XmlNodeType.Element);
var elementContentStarted = false;
if (_xamlReader.IsEmptyElement)
{
if (htmlWriter == null || inlineStyle.Length <= 0) return;
// Output STYLE attribute and clear inlineStyle buffer.
htmlWriter.WriteAttributeString("style", inlineStyle.ToString());
inlineStyle.Remove(0, inlineStyle.Length);
}
else
{
while (ReadNextToken() && _xamlReader.NodeType != XmlNodeType.EndElement)
{
switch (_xamlReader.NodeType)
{
case XmlNodeType.Element:
if (_xamlReader.Name.Contains("."))
AddComplexProperty(htmlWriter, inlineStyle);
else
{
if (htmlWriter != null && !elementContentStarted && inlineStyle.Length > 0)
{
// Output STYLE attribute and clear inlineStyle buffer.
htmlWriter.WriteAttributeString("style", inlineStyle.ToString());
inlineStyle.Remove(0, inlineStyle.Length);
}
elementContentStarted = true;
WriteElement(htmlWriter, inlineStyle);
}
Debug.Assert(_xamlReader.NodeType == XmlNodeType.EndElement || _xamlReader.NodeType == XmlNodeType.Element && _xamlReader.IsEmptyElement);
break;
case XmlNodeType.Comment:
if (htmlWriter != null)
{
if (!elementContentStarted && inlineStyle.Length > 0)
{
htmlWriter.WriteAttributeString("style", inlineStyle.ToString());
inlineStyle.Remove(0, inlineStyle.Length);
}
htmlWriter.WriteComment(_xamlReader.Value);
}
elementContentStarted = true;
break;
case XmlNodeType.CDATA:
case XmlNodeType.Text:
case XmlNodeType.SignificantWhitespace:
if (htmlWriter != null)
{
if (!elementContentStarted && inlineStyle.Length > 0)
{
htmlWriter.WriteAttributeString("style", inlineStyle.ToString());
inlineStyle.Remove(0, inlineStyle.Length);
}
htmlWriter.WriteString(_xamlReader.Value);
}
elementContentStarted = true;
break;
}
}
Debug.Assert(_xamlReader.NodeType == XmlNodeType.EndElement);
}
}
/// <summary>
/// 处理图片
/// </summary>
/// <param name="htmlWriter"></param>
/// <param name="inlineStyle"></param>
private void AddComplexProperty(XmlWriter htmlWriter, StringBuilder inlineStyle)
{
Debug.Assert(_xamlReader.NodeType == XmlNodeType.Element);
if (htmlWriter != null && _xamlReader.Name == "Image.Source")
{
if (ReadNextToken() && _xamlReader.Name == "BitmapImage")
{
var imageUri = _xamlReader.GetAttribute("UriSource");
//data uri格式的图片源
string imgDataUri = "";
if (!string.IsNullOrWhiteSpace(imageUri))
{
// check new image
if (!_htmlResult.Content.ContainsKey(imageUri))
{
var entryPath = string.Concat("Xaml/", imageUri).Replace("/./", "/");
var imageEntry = _zip.GetEntry(entryPath);
using (var stream = imageEntry.Open())
{
var image = ToByteArray(stream);
imgDataUri = GetImageDataUri(entryPath, image);
}
}
// width & height
if (inlineStyle != null && inlineStyle.Length > 0)
{
htmlWriter.WriteAttributeString("style", inlineStyle.ToString());
inlineStyle.Remove(0, inlineStyle.Length);
}
//插入base64编码的图片
htmlWriter.WriteAttributeString("src", imgDataUri);
while (_xamlReader.NodeType != XmlNodeType.EndElement)
ReadNextToken();
return;
}
}
}
if (inlineStyle != null && _xamlReader.Name.EndsWith(".TextDecorations"))
inlineStyle.Append("text-decoration:underline;");
// Skip the element representing the complex property
WriteElementContent(null, null);
}
/// <summary>
/// 将图片转换为html中的data uri格式（仅source部分）
/// </summary>
/// <param name="imgFile">图片文件路径</param>
/// <param name="stream">图片流</param>
/// <returns></returns>
private string GetImageDataUri(string imgFile, byte[] stream)
{
return "data:image/"
+ Path.GetExtension(imgFile).Replace(".", "")
+ ";base64,"
+ Convert.ToBase64String(stream);
}
/// <summary>
/// 将图片转换成Html中的Data Uri格式
/// </summary>
/// <param name="imgFile">图片文件路径</param>
/// <returns></returns>
private string GetImageDataUri(string imgFile)
{
return "<img src=\"data:image/"
+ Path.GetExtension(imgFile).Replace(".", "")
+ ";base64,"
+ Convert.ToBase64String(File.ReadAllBytes(imgFile)) + "\" />";
}
private void WriteElement(XmlTextWriter htmlWriter, StringBuilder inlineStyle)
{
Debug.Assert(_xamlReader.NodeType == XmlNodeType.Element);
if (htmlWriter == null)
{
// Skipping mode; recurse into the xaml element without any output
WriteElementContent(null, null);
}
else
{
string htmlElementName;
switch (_xamlReader.Name)
{
case "Run":
case "Span":
htmlElementName = "span";
break;
case "InlineUIContainer":
htmlElementName = "span";
break;
case "Bold":
htmlElementName = "b";
break;
case "Italic":
htmlElementName = "i";
break;
case "Paragraph":
htmlElementName = "p";
break;
case "BlockUIContainer":
htmlElementName = "div";
break;
case "Section":
htmlElementName = "div";
break;
case "Table":
htmlElementName = "table";
break;
case "TableColumn":
htmlElementName = "col";
break;
case "TableRowGroup":
htmlElementName = "tbody";
break;
case "TableRow":
htmlElementName = "tr";
break;
case "TableCell":
htmlElementName = "td";
break;
case "List":
var marker = _xamlReader.GetAttribute("MarkerStyle");
if (marker == null || marker == "None" || marker == "Disc" || marker == "Circle" || marker == "Square" || marker == "Box")
htmlElementName = "ul";
else
htmlElementName = "ol";
break;
case "ListItem":
htmlElementName = "li";
break;
case "Hyperlink":
htmlElementName = "a";
break;
case "Image":
htmlElementName = "img";
break;
default:
htmlElementName = null; // Ignore the element
break;
}
if (htmlElementName != null)
{
htmlWriter.WriteStartElement(htmlElementName);
WriteFormattingProperties(htmlWriter, inlineStyle);
WriteElementContent(htmlWriter, inlineStyle);
htmlWriter.WriteEndElement();
}
else
{
// Skip this unrecognized xaml element
WriteElementContent(null, null);
}
}
}
private bool ReadNextToken()
{
while (_xamlReader.Read())
{
Debug.Assert(_xamlReader.ReadState == ReadState.Interactive, "Reader is expected to be in Interactive state (" + _xamlReader.ReadState + ")");
switch (_xamlReader.NodeType)
{
case XmlNodeType.Element:
case XmlNodeType.EndElement:
case XmlNodeType.None:
case XmlNodeType.CDATA:
case XmlNodeType.Text:
case XmlNodeType.SignificantWhitespace:
return true;
case XmlNodeType.Whitespace:
if (_xamlReader.XmlSpace == XmlSpace.Preserve)
return true;
// ignore insignificant whitespace
break;
case XmlNodeType.EndEntity:
case XmlNodeType.EntityReference:
// Implement entity reading
//xamlReader.ResolveEntity();
//xamlReader.Read();
//ReadChildNodes( parent, parentBaseUri, xamlReader, positionInfo);
break; // for now we ignore entities as insignificant stuff
case XmlNodeType.Comment:
return true;
}
}
return false;
}
private static byte[] ToByteArray(Stream stream)
{
var memoryStream = stream as MemoryStream;
if (memoryStream != null) return memoryStream.ToArray();
using (memoryStream = new MemoryStream())
{
stream.CopyTo(memoryStream);
return memoryStream.ToArray();
}
}
}
}