From 54ae7cb719ff4e389d9117409f773197a3e221ff Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jean-Philippe=20Bruy=C3=A8re?= <jp_bruyere@hotmail.com>
Date: Tue, 5 Sep 2017 10:11:23 +0200
Subject: [PATCH] choose parser depending on extension of loaded file

---
 src/CodeBuffer.cs   |  3 +++
 src/Parser.cs       |  2 +-
 src/SourceEditor.cs | 27 +++++++++++++++++++++++----
 3 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/src/CodeBuffer.cs b/src/CodeBuffer.cs
index f5abb04..c063c18 100644
--- a/src/CodeBuffer.cs
+++ b/src/CodeBuffer.cs
@@ -110,6 +110,9 @@ namespace Crow.Coding
 			FindLongestVisualLine ();
 		}
 
+		/// <summary>
+		/// Finds the longest visual line as printed on screen with tabulation replaced with n spaces
+		/// </summary>
 		public void FindLongestVisualLine(){
 			longestLineCharCount = 0;
 			for (int i = 0; i < this.LineCount; i++) {
diff --git a/src/Parser.cs b/src/Parser.cs
index ef31463..5d0a92d 100644
--- a/src/Parser.cs
+++ b/src/Parser.cs
@@ -59,7 +59,7 @@ namespace Crow.Coding
 		protected TokenList TokensLine;
 
 		public Point CurrentPosition {
-			get { return new Point (currentLine, currentColumn); } 
+			get { return new Point (currentLine, currentColumn); }
 			set {
 				currentLine = value.Y;
 				currentColumn = value.X;
diff --git a/src/SourceEditor.cs b/src/SourceEditor.cs
index ea5065e..7e8cafc 100644
--- a/src/SourceEditor.cs
+++ b/src/SourceEditor.cs
@@ -60,6 +60,8 @@ namespace Crow.Coding
 			formatting.Add ((int)XMLParser.TokenType.XMLDecl, new TextFormatting (Color.BlueCrayola, Color.Transparent, true));
 			formatting.Add ((int)XMLParser.TokenType.BlockComment, new TextFormatting (Color.Gray, Color.Transparent, false, true));
 
+			parsing.Add (".crow", "Crow.Coding.XMLParser");
+
 			buffer = new CodeBuffer ();
 			buffer.LineUpadateEvent += Buffer_LineUpadateEvent;
 			buffer.LineAdditionEvent += Buffer_LineAdditionEvent;;
@@ -68,6 +70,9 @@ namespace Crow.Coding
 		}
 		#endregion
 
+		const int leftMarginGap = 0;//gap between items in margin and text
+		const int foldSize = 9;//folding rectangles size
+
 		#region private and protected fields
 		bool foldingEnabled = false;
 		string filePath = "unamed.txt";
@@ -84,6 +89,7 @@ namespace Crow.Coding
 		Point _selRelease = -1;	//selection end (row,column)
 
 		Dictionary<int, TextFormatting> formatting = new Dictionary<int, TextFormatting>();
+		Dictionary<string, string> parsing = new Dictionary<string, string>();
 
 		protected Rectangle rText;
 		protected FontExtents fe;
@@ -149,15 +155,14 @@ namespace Crow.Coding
 			}
 			RegisterForGraphicUpdate ();
 		}
-		const int leftMarginGap = 0;
-		const int foldSize = 9;
 		void measureLeftMargin () {
 			leftMargin = 0;
 			if (PrintLineNumbers)
 				leftMargin += (int)Math.Ceiling((double)buffer.LineCount.ToString().Length * fe.MaxXAdvance);
 			if (foldingEnabled)
 				leftMargin += foldSize;
-			leftMargin += leftMarginGap;
+			if (leftMargin > 0)
+				leftMargin += leftMarginGap;
 			updateVisibleColumns ();
 		}
 		void findLongestLineAndUpdateMaxScrollX() {
@@ -183,7 +188,8 @@ namespace Crow.Coding
 		#region Buffer events handlers
 		void Buffer_BufferCleared (object sender, EventArgs e)
 		{
-			parser = new XMLParser (buffer);
+			if (parser != null)
+				parser.Tokens.Clear ();
 			buffer.longestLineCharCount = 0;
 			buffer.longestLineIdx = 0;
 			measureLeftMargin ();
@@ -249,6 +255,17 @@ namespace Crow.Coding
 		}
 		#endregion
 
+		Parser getParserFromExt (string extension) {
+			if (string.IsNullOrEmpty(extension))
+				return null;
+			if (!parsing.ContainsKey(extension))
+				return null;
+			Type parserType = Type.GetType (parsing [extension]);
+			if (parserType == null)
+				return null;
+			return (Parser)Activator.CreateInstance (parserType, buffer );
+		}
+
 		#region Public Crow Properties
 		[XmlAttributeAttribute]
 		public bool PrintLineNumbers
@@ -281,6 +298,8 @@ namespace Crow.Coding
 				if (!File.Exists (filePath))
 					return;
 
+				parser = getParserFromExt (System.IO.Path.GetExtension (filePath));
+
 				using (StreamReader sr = new StreamReader (filePath)) {
 					string txt = sr.ReadToEnd ();
 					buffer.Load (txt);
-- 
2.47.3