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ICSharpCode.TextEditor/Project/Src/Document/HighlightingStrategy/TextWord.cs

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+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+using System.Diagnostics;
+using System.Drawing;
+
+namespace ICSharpCode.TextEditor.Document
+{
+	public enum TextWordType {
+		Word,
+		Space,
+		Tab
+    }
+	
+	/// <summary>
+	/// This class represents single words with color information, two special versions of a word are
+	/// spaces and tabs.
+	/// </summary>
+	public class TextWord
+	{
+		HighlightColor  color;
+		LineSegment     line;
+		IDocument       document;
+		
+		
+		int          offset;
+		int          length;
+		
+		public sealed class SpaceTextWord : TextWord
+		{
+			public SpaceTextWord()
+			{
+				length = 1;
+			}
+			
+			public SpaceTextWord(HighlightColor color)
+			{
+				length = 1;
+				base.SyntaxColor = color;
+			}
+			
+			public override Font GetFont(FontContainer fontContainer)
+			{
+				return null;
+			}
+			
+			public override TextWordType Type {
+				get {
+					return TextWordType.Space;
+				}
+			}
+			public override bool IsWhiteSpace {
+				get {
+					return true;
+				}
+			}
+		}
+		
+		public sealed class TabTextWord : TextWord
+		{
+			public TabTextWord()
+			{
+				length = 1;
+			}
+			public TabTextWord(HighlightColor color)
+			{
+				length = 1;
+				base.SyntaxColor = color;
+			}
+			
+			public override Font GetFont(FontContainer fontContainer)
+			{
+				return null;
+			}
+			
+			public override TextWordType Type {
+				get {
+					return TextWordType.Tab;
+				}
+			}
+			public override bool IsWhiteSpace {
+				get {
+					return true;
+				}
+			}
+		}
+		
+		static TextWord spaceWord = new SpaceTextWord();
+		static TextWord tabWord   = new TabTextWord();
+		
+		bool hasDefaultColor;
+		
+		public static TextWord Space {
+			get {
+				return spaceWord;
+			}
+		}
+		
+		public static TextWord Tab {
+			get {
+				return tabWord;
+			}
+		}
+		
+		public int Offset {
+			get {
+				return offset;
+			}
+		}
+		
+		public int Length {
+			get {
+				return length;
+			}
+		}
+		
+		/// <summary>
+		/// Splits the <paramref name="word"/> into two parts: the part before <paramref name="pos"/> is assigned to
+		/// the reference parameter <paramref name="word"/>, the part after <paramref name="pos"/> is returned.
+		/// </summary>
+		public static TextWord Split(ref TextWord word, int pos)
+		{
+			#if DEBUG
+			if (word.Type != TextWordType.Word)
+				throw new ArgumentException("word.Type must be Word");
+			if (pos <= 0)
+				throw new ArgumentOutOfRangeException("pos", pos, "pos must be > 0");
+			if (pos >= word.Length)
+				throw new ArgumentOutOfRangeException("pos", pos, "pos must be < word.Length");
+			#endif
+			TextWord after = new TextWord(word.document, word.line, word.offset + pos, word.length - pos, word.color, word.hasDefaultColor);
+			word = new TextWord(word.document, word.line, word.offset, pos, word.color, word.hasDefaultColor);
+			return after;
+		}
+		
+		public bool HasDefaultColor {
+			get {
+				return hasDefaultColor;
+			}
+		}
+		
+		public virtual TextWordType Type {
+			get {
+				return TextWordType.Word;
+			}
+		}
+		
+		public string Word {
+			get {
+				if (document == null) {
+					return string.Empty;
+				}
+				return document.GetText(line.Offset + offset, length);
+			}
+		}
+		
+		public virtual Font GetFont(FontContainer fontContainer)
+		{
+			return color.GetFont(fontContainer);
+		}
+		
+		public Color Color {
+			get {
+				if (color == null)
+					return Color.Black;
+				else
+					return color.Color;
+			}
+		}
+		
+		public bool Bold {
+			get {
+				if (color == null)
+					return false;
+				else
+					return color.Bold;
+			}
+		}
+		
+		public bool Italic {
+			get {
+				if (color == null)
+					return false;
+				else
+					return color.Italic;
+			}
+		}
+		
+		public HighlightColor SyntaxColor {
+			get {
+				return color;
+			}
+			set {
+				Debug.Assert(value != null);
+				color = value;
+			}
+		}
+		
+		public virtual bool IsWhiteSpace {
+			get {
+				return false;
+			}
+		}
+
+		public virtual bool IsDelimiter { get; set; } = false;
+		
+		protected TextWord()
+		{
+		}
+		
+		// TAB
+		public TextWord(IDocument document, LineSegment line, int offset, int length, HighlightColor color, bool hasDefaultColor)
+		{
+			Debug.Assert(document != null);
+			Debug.Assert(line != null);
+			Debug.Assert(color != null);
+			
+			this.document = document;
+			this.line  = line;
+			this.offset = offset;
+			this.length = length;
+			this.color = color;
+			this.hasDefaultColor = hasDefaultColor;
+		}
+		
+		/// <summary>
+		/// Converts a <see cref="TextWord"/> instance to string (for debug purposes)
+		/// </summary>
+		public override string ToString()
+		{
+			return "[TextWord: Word = " + Word + ", Color = " + Color + "]";
+		}
+	}
+}