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Escape XML text before parsing

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This commit is contained in:
Chris Kaczor
2014-10-14 11:13:03 -04:00
parent 4cbb7d44f2
commit a7c9354e47
1 changed files with 28 additions and 22 deletions
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50
HtmlLabelControl/TextParser.cs
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@@ -2,6 +2,7 @@
using System.Collections.Generic; using System.Collections.Generic;
using System.Collections.ObjectModel; using System.Collections.ObjectModel;
using System.Globalization; using System.Globalization;
using System.Security;
using System.Windows; using System.Windows;
using System.Windows.Media; using System.Windows.Media;
using System.Xml; using System.Xml;
@@ -16,6 +17,9 @@ namespace Common.Wpf.HtmlLabelControl
{ {
_parentControl = parentControl; _parentControl = parentControl;
// Escape the supplied text
text = SecurityElement.Escape(text);
// Add a root tag so the parser is happy // Add a root tag so the parser is happy
text = string.Format(CultureInfo.InvariantCulture, "<body>{0}</body>", text); text = string.Format(CultureInfo.InvariantCulture, "<body>{0}</body>", text);
@@ -23,22 +27,21 @@ namespace Common.Wpf.HtmlLabelControl
text = text.Replace("\r\n", "\n"); text = text.Replace("\r\n", "\n");
// Create an XML document and load it with the text // Create an XML document and load it with the text
XmlDocument xmlDocument = new XmlDocument(); var xmlDocument = new XmlDocument { PreserveWhitespace = true };
xmlDocument.PreserveWhitespace = true;
xmlDocument.LoadXml(text); xmlDocument.LoadXml(text);
// Create a list of text lines // Create a list of text lines
Collection<TextLine> lines = new Collection<TextLine>(); var lines = new Collection<TextLine>();
// Walk over the nodes and build up the fragment list // Walk over the nodes and build up the fragment list
walkNodes(xmlDocument.ChildNodes, lines); WalkNodes(xmlDocument.ChildNodes, lines);
return lines; return lines;
} }
private readonly Stack<TextFragmentStyle> _attributeStack = new Stack<TextFragmentStyle>(); private readonly Stack<TextFragmentStyle> _attributeStack = new Stack<TextFragmentStyle>();
private void walkNodes(XmlNodeList xmlNodeList, Collection<TextLine> textLines) private void WalkNodes(XmlNodeList xmlNodeList, Collection<TextLine> textLines)
{ {
if (textLines.Count == 0) if (textLines.Count == 0)
textLines.Add(new TextLine()); textLines.Add(new TextLine());
@@ -53,19 +56,18 @@ namespace Common.Wpf.HtmlLabelControl
case "#TEXT": case "#TEXT":
// Split the fragment and the line endings // Split the fragment and the line endings
string[] lines = xmlNode.Value.Split('\n'); var lines = xmlNode.Value.Split('\n');
bool firstLine = true; var firstLine = true;
foreach (string line in lines) foreach (var line in lines)
{ {
TextLine textLine = (firstLine ? textLines[textLines.Count - 1] : new TextLine()); var textLine = (firstLine ? textLines[textLines.Count - 1] : new TextLine());
// Create a new fragment and fill the style information // Create a new fragment and fill the style information
TextFragment textFragment = new TextFragment(_parentControl); var textFragment = new TextFragment(_parentControl) { Text = line };
textFragment.Text = line;
foreach (TextFragmentStyle s in _attributeStack) foreach (var s in _attributeStack)
{ {
s.Apply(textFragment); s.Apply(textFragment);
} }
@@ -105,26 +107,30 @@ namespace Common.Wpf.HtmlLabelControl
case "FONT": case "FONT":
style = new TextFragmentStyle(); style = new TextFragmentStyle();
foreach (XmlAttribute attribute in xmlNode.Attributes) if (xmlNode.Attributes != null)
{ {
switch (attribute.Name.ToUpperInvariant()) foreach (XmlAttribute attribute in xmlNode.Attributes)
{ {
case "SIZE": switch (attribute.Name.ToUpperInvariant())
style.Size = Convert.ToDouble(attribute.Value, CultureInfo.InvariantCulture); {
break; case "SIZE":
style.Size = Convert.ToDouble(attribute.Value, CultureInfo.InvariantCulture);
break;
case "COLOR": case "COLOR":
style.Color = (Brush) new BrushConverter().ConvertFromString(attribute.Value); style.Color = (Brush) new BrushConverter().ConvertFromString(attribute.Value);
break; break;
}
} }
_attributeStack.Push(style);
} }
_attributeStack.Push(style);
break; break;
} }
if (xmlNode.ChildNodes.Count > 0) if (xmlNode.ChildNodes.Count > 0)
walkNodes(xmlNode.ChildNodes, textLines); WalkNodes(xmlNode.ChildNodes, textLines);
if (_attributeStack.Count > 0) if (_attributeStack.Count > 0)
_attributeStack.Pop(); _attributeStack.Pop();