[C] Primitive 'Go to Declaration'

 * CBinding.addin.xml:
 * Project/CProject.cs: Add GoToDeclaration command.
 * Gui/CTextEditorExtension.cs: Primitive 'Go to Declaration' implementation.

3 files changed, 49 insertions, 1 deletions

diff --git a/main/src/addins/CBinding/CBinding.addin.xml b/main/src/addins/CBinding/CBinding.addin.xml
index ef7f08e2df..3dd4bb4426 100644
--- a/main/src/addins/CBinding/CBinding.addin.xml
+++ b/main/src/addins/CBinding/CBinding.addin.xml
@@ -188,6 +188,7 @@
 			<Command id = "CBinding.CProjectCommands.AddPackage" _label = "Edit Packages..." />
 			<Command id = "CBinding.CProjectCommands.UpdateClassPad" _label = "Update class pad" icon = "res:update" />
 			<Command id = "CBinding.CProjectCommands.ShowPackageDetails" _label = "Details..." />
+			<Command id = "CBinding.CProjectCommands.GotoDeclaration" _label = "Go to Declaration" />
 		</Category>
 	</Extension>
 	
@@ -266,4 +267,8 @@
 		<Parser class = "CBinding.Parser.CDocumentParser" id = "CDocumentParser"
 			fileExtensions=".c,.cpp,.cxx,.cc,.h,.hpp,.hh,.hxx" />
 	</Extension>
+	
+	<Extension path="/MonoDevelop/SourceEditor2/ContextMenu/Editor">
+		<CommandItem id = "CBinding.CProjectCommands.GotoDeclaration"/>
+	</Extension>
 </Addin>
diff --git a/main/src/addins/CBinding/Gui/CTextEditorExtension.cs b/main/src/addins/CBinding/Gui/CTextEditorExtension.cs
index c9d40b51e9..124ef630d1 100644
--- a/main/src/addins/CBinding/Gui/CTextEditorExtension.cs
+++ b/main/src/addins/CBinding/Gui/CTextEditorExtension.cs
@@ -598,5 +598,47 @@ namespace CBinding
 			completionContext.TriggerOffset = i-1;
 			return accumulator+1;
 		}// ResetTriggerOffset
+		
+		[CommandHandler (CBinding.CProjectCommands.GotoDeclaration)]
+		public void GotoDeclaration ()
+		{
+			LanguageItem item = GetLanguageItemAt (Editor.Caret.Location);
+			if (item != null)
+				IdeApp.Workbench.OpenDocument ((FilePath)item.File, (int)item.Line, 1, true);
+		}
+		
+		[CommandUpdateHandler (CBinding.CProjectCommands.GotoDeclaration)]
+		public void CanGotoDeclaration (CommandInfo item)
+		{
+			item.Visible = (GetLanguageItemAt (Editor.Caret.Location) != null);
+		}
+		
+		private LanguageItem GetLanguageItemAt (DocumentLocation location)
+		{
+			CProject project = Document.Project as CProject;
+			string token = GetTokenAt (location);
+			if (project != null && !string.IsNullOrEmpty (token)) {
+				ProjectInformation info = ProjectInformationManager.Instance.Get (project);
+				return info.AllItems ().FirstOrDefault (i => i.Name.Equals (token, StringComparison.Ordinal));
+			}
+			
+			return null;
+		}
+		
+		private string GetTokenAt (DocumentLocation location)
+		{
+			int lineOffset = location.Column-1;
+			string line = Editor.GetLineText (location.Line);
+			int first = line.LastIndexOfAny (allowedChars, lineOffset)+1,
+			    last = line.IndexOfAny (allowedChars, lineOffset);
+			if (last < 0) last = line.Length - 1;
+			string token = string.Empty;
+			    
+			if (first >= 0 && first < last && last < line.Length) {
+				token = line.Substring (first, last-first);
+			}
+			
+			return token.Trim ();
+		}
 	}
 }
diff --git a/main/src/addins/CBinding/Project/CProject.cs b/main/src/addins/CBinding/Project/CProject.cs
index ce83b1e833..451bf39b07 100644
--- a/main/src/addins/CBinding/Project/CProject.cs
+++ b/main/src/addins/CBinding/Project/CProject.cs
@@ -59,7 +59,8 @@ namespace CBinding
 	public enum CProjectCommands {
 		AddPackage,
 		UpdateClassPad,
-		ShowPackageDetails
+		ShowPackageDetails,
+		GotoDeclaration,
 	}
 	
 	[DataInclude(typeof(CProjectConfiguration))]