XML Parser: ParseAndLock method in the XamlParser

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@4719 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

samples/XmlDOM/Window1.xaml.cs

@@ -37,6 +37,7 @@ namespace XmlDOM
 		}
 		
 		TextMarkerService markerService;
+		List<DocumentChangeEventArgs> changes = new List<DocumentChangeEventArgs>();
 		
 		protected override void OnInitialized(EventArgs e)
 		{
@@ -44,8 +45,11 @@ namespace XmlDOM
 			
 			editor.TextArea.TextView.MouseMove += new MouseEventHandler(editor_TextArea_TextView_MouseMove);
 			
-			editor.Document.Changed += delegate { textDirty = true; };
-			parser = new AXmlParser(editor.Document);
+			editor.Document.Changed += delegate(object sender, DocumentChangeEventArgs e2) {
+				textDirty = true;
+				changes.Add(e2);
+			};
+			parser = new AXmlParser();
 
 			DispatcherTimer timer = new DispatcherTimer();
 			timer.Interval = TimeSpan.FromSeconds(0.5);
@@ -75,7 +79,8 @@ namespace XmlDOM
 			AXmlDocument doc;
 			parser.Lock.EnterWriteLock();
 			try {
-				doc = parser.Parse();
+				doc = parser.Parse(editor.Document.Text, changes);
+				changes.Clear();
 			} finally {
 				parser.Lock.ExitWriteLock();
 			}

src/AddIns/BackendBindings/XamlBinding/XamlBinding/XamlParser.cs

@@ -5,13 +5,16 @@
 //     <version>$Revision: 2568 $</version>
 // </file>
 
-using ICSharpCode.SharpDevelop.Project;
+using ICSharpCode.AvalonEdit.Document;
 using System;
 using System.Diagnostics;
 using System.IO;
+using System.Linq;
 using System.Xml;
+using ICSharpCode.AvalonEdit.Xml;
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Dom;
+using ICSharpCode.SharpDevelop.Project;
 
 namespace ICSharpCode.XamlBinding
 {
@@ -46,6 +49,42 @@ namespace ICSharpCode.XamlBinding
 		{
 			return false;
 		}
+		
+		AXmlParser axmlParser;
+		ICSharpCode.SharpDevelop.ITextBuffer lastParsedContent;
+		
+		/// <summary>
+		/// Parse the given text and enter read lock.
+		/// No parsing is done if the text is older than seen before.
+		/// </summary>
+		public IDisposable ParseAndLock(ICSharpCode.SharpDevelop.ITextBuffer fileContent)
+		{
+			// Is fileContent newer?
+			if (lastParsedContent == null || fileContent.Version.CompareAge(lastParsedContent.Version) > 0) {
+				axmlParser.Lock.EnterWriteLock();
+				// Dobuble check, now that we are thread-safe
+				if (lastParsedContent == null) {
+					// First parse
+					axmlParser = new AXmlParser();
+					axmlParser.Parse(fileContent.Text, null);
+					lastParsedContent = fileContent;
+				} else if (fileContent.Version.CompareAge(lastParsedContent.Version) > 0) {
+					// Incremental parse
+					var changes = lastParsedContent.Version.GetChangesTo(fileContent.Version).
+						Select(c => new DocumentChangeEventArgs(c.Offset, c.RemovedText, c.InsertedText));
+					axmlParser.Parse(fileContent.Text, changes);
+					lastParsedContent = fileContent;
+				} else {
+					// fileContent is older - no need to parse
+				}
+				axmlParser.Lock.EnterReadLock();
+				axmlParser.Lock.ExitWriteLock();
+			} else {
+				// fileContent is older - no need to parse
+				axmlParser.Lock.EnterReadLock();
+			}
+			return new CallbackOnDispose(() => axmlParser.Lock.ExitReadLock());
+		}
 
 		public ICompilationUnit Parse(IProjectContent projectContent, string fileName, ICSharpCode.SharpDevelop.ITextBuffer fileContent)
 		{

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit.Tests/XmlParser/ParserTests.cs

@@ -154,7 +154,7 @@ namespace ICSharpCode.AvalonEdit.Xml.Tests
 			
 			string content = testFile.Content;
 			Debug.WriteLine("Testing " + testFile.Name + "...");
-			AXmlParser parser = new AXmlParser(content);
+			AXmlParser parser = new AXmlParser();
 			
 			bool usingDTD = content.Contains("<!DOCTYPE") && (content.Contains("<!ENTITY") || content.Contains(" SYSTEM "));
 			if (usingDTD)
@@ -164,7 +164,7 @@ namespace ICSharpCode.AvalonEdit.Xml.Tests
 			
 			parser.Lock.EnterWriteLock();
 			try {
-				document = parser.Parse();
+				document = parser.Parse(content, null);
 			} finally {
 				parser.Lock.ExitWriteLock();
 			}

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Xml/AXmlParser.cs

@@ -88,13 +88,9 @@ namespace ICSharpCode.AvalonEdit.Xml
 	/// </remarks>
 	public class AXmlParser
 	{
-		string input;
 		AXmlDocument userDocument;
-		TextDocument textDocument;
 		
 		internal TrackedSegmentCollection TrackedSegments { get; private set; }
-		ChangeTrackingCheckpoint lastCheckpoint;
-		ReaderWriterLockSlim lockObject;
 		
 		/// <summary>
 		/// Generate syntax error when seeing enity reference other then the build-in ones
@@ -102,12 +98,11 @@ namespace ICSharpCode.AvalonEdit.Xml
 		public bool UknonwEntityReferenceIsError { get; set; }
 		
 		/// <summary> Create new parser </summary>
-		public AXmlParser(string input)
+		public AXmlParser()
 		{
-			this.input = input;
 			this.UknonwEntityReferenceIsError = true;
 			this.TrackedSegments = new TrackedSegmentCollection();
-			this.lockObject = new ReaderWriterLockSlim();
+			this.Lock = new ReaderWriterLockSlim();
 			
 			this.userDocument = new AXmlDocument() { Parser = this };
 			this.userDocument.Document = this.userDocument;
@@ -116,15 +111,6 @@ namespace ICSharpCode.AvalonEdit.Xml
 			this.userDocument.IsCached = false;
 		}
 		
-		/// <summary>
-		/// Create new parser, but do not parse the text yet.
-		/// </summary>
-		public AXmlParser(TextDocument textDocument)
-			: this(textDocument.Text)
-		{
-			this.textDocument = textDocument;
-		}
-		
 		/// <summary> Throws exception if condition is false </summary>
 		internal static void Assert(bool condition, string message)
 		{
@@ -147,23 +133,19 @@ namespace ICSharpCode.AvalonEdit.Xml
 			System.Diagnostics.Debug.WriteLine(string.Format("XML: " + text, pars));
 		}
 		
-		public AXmlDocument Parse()
+		/// <summary>
+		/// Incrementaly parse the given text.
+		/// You have to hold the write lock.
+		/// 'changesSinceLastParse' can be null on the first call.
+		/// </summary>
+		public AXmlDocument Parse(string input, IEnumerable<DocumentChangeEventArgs> changesSinceLastParse)
 		{
 			if (!Lock.IsWriteLockHeld)
 				throw new InvalidOperationException("Lock needed!");
 			
-			if (textDocument != null) { // incremental parse
-				ChangeTrackingCheckpoint checkpoint;
-				input = textDocument.CreateSnapshot(out checkpoint).Text;
-				
-				// Use changes to invalidate cache
-				if (lastCheckpoint != null) {
-					var changes = lastCheckpoint.GetChangesTo(checkpoint);
-					if (!changes.Any())
-						return userDocument;
-					this.TrackedSegments.UpdateOffsetsAndInvalidate(changes);
-				}
-				lastCheckpoint = checkpoint;
+			// Use changes to invalidate cache
+			if (changesSinceLastParse != null) {
+				this.TrackedSegments.UpdateOffsetsAndInvalidate(changesSinceLastParse);
 			}
 			
 			TagReader tagReader = new TagReader(this, input);
@@ -180,8 +162,6 @@ namespace ICSharpCode.AvalonEdit.Xml
 		/// <summary>
 		/// Makes calls to Parse() thread-safe. Use Lock everywhere Parse() is called.
 		/// </summary>
-		public ReaderWriterLockSlim Lock {
-			get { return this.lockObject; }
-		}
+		public ReaderWriterLockSlim Lock { get; private set; }
 	}
 }