mirror of
https://github.com/ckaczor/Common.Wpf.git
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140 lines
4.6 KiB
C#
140 lines
4.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Globalization;
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using System.Windows;
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using System.Windows.Media;
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using System.Xml;
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namespace Common.Wpf.HtmlTextBlock
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{
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public class TextParser
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{
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private HtmlTextBlock _parentControl;
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public Collection<TextLine> Parse(HtmlTextBlock parentControl, string text)
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{
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_parentControl = parentControl;
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text = text.Replace("&", "&");
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// Add a root tag so the parser is happy
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text = string.Format(CultureInfo.InvariantCulture, "<body>{0}</body>", text);
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// Normalize line endings
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text = text.Replace("\r\n", "\n");
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// Create an XML document and load it with the text
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XmlDocument xmlDocument = new XmlDocument();
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xmlDocument.PreserveWhitespace = true;
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xmlDocument.LoadXml(text);
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// Create a list of text lines
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Collection<TextLine> lines = new Collection<TextLine>();
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// Walk over the nodes and build up the fragment list
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WalkNodes(xmlDocument.ChildNodes, lines);
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return lines;
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}
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private readonly Stack<TextFragmentStyle> _attributeStack = new Stack<TextFragmentStyle>();
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private void WalkNodes(XmlNodeList xmlNodeList, Collection<TextLine> textLines)
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{
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if (textLines.Count == 0)
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textLines.Add(new TextLine());
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foreach (XmlNode xmlNode in xmlNodeList)
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{
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TextFragmentStyle style;
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switch (xmlNode.Name.ToUpperInvariant())
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{
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case "#WHITESPACE":
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case "#TEXT":
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// Split the fragment and the line endings
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string[] lines = xmlNode.Value.Split('\n');
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bool firstLine = true;
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foreach (string line in lines)
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{
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TextLine textLine = (firstLine ? textLines[textLines.Count - 1] : new TextLine());
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// Create a new fragment and fill the style information
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TextFragment textFragment = new TextFragment(_parentControl);
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textFragment.Text = line;
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foreach (TextFragmentStyle s in _attributeStack)
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{
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s.Apply(textFragment);
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}
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// Add the fragment to the list
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textLine.FragmentList.Add(textFragment);
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if (!firstLine)
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textLines.Add(textLine);
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firstLine = false;
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}
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break;
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case "EM":
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case "B":
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style = new TextFragmentStyle { Weight = FontWeights.Bold };
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_attributeStack.Push(style);
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break;
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case "U":
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style = new TextFragmentStyle { Underline = true };
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_attributeStack.Push(style);
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break;
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case "CITE":
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style = new TextFragmentStyle { Style = FontStyles.Italic };
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_attributeStack.Push(style);
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break;
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case "FONT":
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style = new TextFragmentStyle();
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if (xmlNode.Attributes == null)
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break;
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foreach (XmlAttribute attribute in xmlNode.Attributes)
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{
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switch (attribute.Name.ToUpperInvariant())
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{
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case "SIZE":
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style.Size = Convert.ToDouble(attribute.Value, CultureInfo.InvariantCulture);
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break;
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case "COLOR":
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style.Color = (Brush) new BrushConverter().ConvertFromString(attribute.Value);
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break;
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}
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}
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_attributeStack.Push(style);
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break;
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}
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if (xmlNode.ChildNodes.Count > 0)
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WalkNodes(xmlNode.ChildNodes, textLines);
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if (_attributeStack.Count > 0)
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_attributeStack.Pop();
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}
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}
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}
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} |