253 lines
10 KiB
C#
253 lines
10 KiB
C#
using System;
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using System.Text;
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using System.IO;
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using System.Xml;
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using System.Collections;
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using System.Text.RegularExpressions;
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#if TREEGX
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namespace DevComponents.Tree.TextMarkup
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#elif DOTNETBAR
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namespace DevComponents.DotNetBar.TextMarkup
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#elif SUPERGRID
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namespace DevComponents.SuperGrid.TextMarkup
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#endif
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{
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internal class MarkupParser
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{
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#region Private Variables
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private static string TextElementName = "text";
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private static string BodyTag = "body";
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#endregion
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#region Internal Implementation
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public static BodyElement Parse(string text)
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{
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StringBuilder plainText = new StringBuilder(text.Length);
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BodyElement root = new BodyElement();
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root.HasExpandElement = false;
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MarkupElement currentParent = root;
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Stack openTags = new Stack();
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openTags.Push(root);
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// Input text is not wrapped into the container tag so we wrap it here
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text = text.Replace(" ", "{ent_nbsp}");
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text = text.Replace("&zwsp;", "{ent_zwsp}");
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text = text.Replace("<", "{ent_lt}");
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text = text.Replace(">", "{ent_gt}");
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text = text.Replace("&", "{ent_amp}");
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text = text.Replace("|", "{ent_l}");
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text = text.Replace("&", "|");
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text = text.Replace("{ent_nbsp}", " ");
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text = text.Replace("{ent_zwsp}", "&zwsp;");
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text = text.Replace("{ent_lt}", "<");
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text = text.Replace("{ent_gt}", ">");
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StringReader sr = new StringReader("<"+BodyTag+">" + text + "</"+BodyTag+">");
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#if !DEBUG
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try
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#endif
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{
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XmlTextReader reader = new XmlTextReader(sr);
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//reader.EntityHandling = EntityHandling.ExpandCharEntities;
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while (reader.Read())
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{
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if (reader.NodeType == XmlNodeType.Element)
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{
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if (reader.Name == BodyTag)
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continue;
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MarkupElement el = CreateMarkupElement(reader.Name);
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if (el == null)
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{
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reader.Skip();
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continue;
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}
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else if (el is ExpandElement)
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root.HasExpandElement = true;
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if (el is IActiveMarkupElement)
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root.ActiveElements.Add(el);
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// Parse any attributes here
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if (reader.AttributeCount > 0)
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{
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el.ReadAttributes(reader);
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reader.MoveToElement();
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}
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currentParent.Elements.Add(el);
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if (el is ContainerElement)
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currentParent = el;
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if (!reader.IsEmptyElement)
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openTags.Push(el);
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}
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else if (reader.NodeType == XmlNodeType.Text)
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{
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if (reader.Value.Length == 1)
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{
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TextElement el = CreateMarkupElement(TextElementName) as TextElement;
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if (reader.Value == " ")
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{
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el.TrailingSpace = true;
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plainText.Append(' ');
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}
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else
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{
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el.Text = reader.Value;
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el.Text = el.Text.Replace("|", "&");
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el.Text = el.Text.Replace("{ent_l}", "|");
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el.Text = el.Text.Replace("{ent_amp}", "&&");
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plainText.Append(el.Text+" ");
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}
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currentParent.Elements.Add(el);
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}
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else
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{
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string s = reader.Value;
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if (s.StartsWith("\r\n"))
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s = s.TrimStart(new char[] { '\r', '\n' });
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s = s.Replace("\r\n", " ");
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string[] words = s.Split(' ');
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bool space = false;
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if (currentParent.Elements.Count > 0 && currentParent.Elements[currentParent.Elements.Count - 1] is NewLine)
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space = true;
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for (int i = 0; i < words.Length; i++)
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{
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if (words[i].Length == 0)
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{
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if (space)
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continue;
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space = true;
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}
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else
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space = false;
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TextElement el = CreateMarkupElement(TextElementName) as TextElement;
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el.Text = words[i].Replace("|","&");
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el.Text = el.Text.Replace("{ent_l}", "|");
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el.Text = el.Text.Replace("{ent_amp}", "&&");
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plainText.Append(el.Text + " ");
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if (i < words.Length - 1)
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{
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el.TrailingSpace = true;
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space = true;
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}
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currentParent.Elements.Add(el);
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}
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}
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}
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else if (reader.NodeType == XmlNodeType.Whitespace)
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{
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if (reader.Value.IndexOf(' ') >= 0)
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{
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TextElement el = CreateMarkupElement(TextElementName) as TextElement;
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el.TrailingSpace = true;
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currentParent.Elements.Add(el);
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}
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}
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else if (reader.NodeType == XmlNodeType.EntityReference)
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{
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TextElement el = CreateMarkupElement(TextElementName) as TextElement;
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if (reader.Name == "nbsp")
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{
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el.TrailingSpace = true;
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}
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else if (reader.Name == "zwsp")
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{
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el.TrailingSpace = false;
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}
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else
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el.Text = reader.Name;
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el.EnablePrefixHandling = false;
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currentParent.Elements.Add(el);
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}
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else if (reader.NodeType == XmlNodeType.EndElement)
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{
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MarkupElement el = openTags.Pop() as MarkupElement;
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if (el != currentParent)
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{
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currentParent.Elements.Add(new EndMarkupElement(el));
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}
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else
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{
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if (currentParent != root)
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currentParent = currentParent.Parent;
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}
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}
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}
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}
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#if !DEBUG
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catch
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{
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return null;
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}
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#endif
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root.PlainText = plainText.ToString();
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return root;
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}
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public static MarkupElement CreateMarkupElement(string elementName)
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{
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if (elementName == "b" || elementName == "strong")
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return new Strong();
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else if (elementName == "i" || elementName == "em")
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return new Italic();
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else if (elementName == "u")
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return new Underline();
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else if (elementName == "br")
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return new NewLine();
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else if (elementName == "expand")
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return new ExpandElement();
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else if (elementName == "a")
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return new HyperLink();
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else if (elementName == "p")
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return new Paragraph();
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else if (elementName == "div")
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return new Div();
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else if (elementName == "span")
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return new Span();
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else if (elementName == "img")
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return new ImageElement();
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else if (elementName == "h1")
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return new Heading();
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else if (elementName == "h2")
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return new Heading(2);
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else if (elementName == "h3")
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return new Heading(3);
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else if (elementName == "h4")
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return new Heading(4);
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else if (elementName == "h5")
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return new Heading(5);
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else if (elementName == "h6")
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return new Heading(6);
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else if (elementName == "font")
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return new FontElement();
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else if (elementName == "s" || elementName == "strike")
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return new Strike();
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else if (elementName == TextElementName)
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return new TextElement();
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return null;
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}
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/// <summary>
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/// Tests whether input text could be markup text.
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/// </summary>
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/// <param name="text">Text to test.</param>
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/// <returns>true if text could be markup, otherwise false</returns>
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public static bool IsMarkup(ref string text)
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{
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if (text.IndexOf("</") < 0 && text.IndexOf("/>") < 0)
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return false;
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return true;
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}
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internal static string RemoveExpand(string text)
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{
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return Regex.Replace(text, "<expand.*?>", "", RegexOptions.IgnoreCase);
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}
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#endregion
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}
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}
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