From d5663f513447a7908b5af7044c29f2788ba02e88 Mon Sep 17 00:00:00 2001
From: John Camelon <jcamelon@ca.ibm.com>
Date: Tue, 3 May 2005 18:48:24 +0000
Subject: [PATCH] Patch for Devin Steffler.

FIXED 72716- [Search] Search actions in "magic" include files do not work.
---
 .../cdt/core/search/DOMSearchUtil.java        | 85 +++++++++++++++-
 .../eclipse/cdt/ui/tests/DOMAST/DOMAST.java   |  9 ++
 .../ui/search/actions/FindAction.java         | 98 ++++++++++++-------
 .../ui/search/actions/FindRefsAction.java     |  3 -
 .../actions/OpenDeclarationsAction.java       | 67 ++++++++-----
 .../search/actions/OpenDefinitionAction.java  | 67 ++++++++-----
 6 files changed, 238 insertions(+), 91 deletions(-)

diff --git a/core/org.eclipse.cdt.core/search/org/eclipse/cdt/core/search/DOMSearchUtil.java b/core/org.eclipse.cdt.core/search/org/eclipse/cdt/core/search/DOMSearchUtil.java
index ebcf7003a8e..d4d3556e049 100644
--- a/core/org.eclipse.cdt.core/search/org/eclipse/cdt/core/search/DOMSearchUtil.java
+++ b/core/org.eclipse.cdt.core/search/org/eclipse/cdt/core/search/DOMSearchUtil.java
@@ -50,6 +50,7 @@ import org.eclipse.cdt.core.search.ICSearchConstants.SearchFor;
 import org.eclipse.cdt.internal.core.search.matching.CSearchPattern;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
+import org.eclipse.core.runtime.IPath;
 
 /**
  * Utility class to have commonly used algorithms in one place for searching with the DOM. 
@@ -171,7 +172,75 @@ public class DOMSearchUtil {
     }
     
     /**
-     * This is used to get a List of selected names in an IFile based on the offset and length into that IFile.
+     * This is used to get an array of selected names in an IASTTranslationUnit based on the offset 
+     * and length into that IASTTranslationUnit.
+     * 
+     * ex: IASTTranslationUnit contains: int foo;
+     * then getSelectedNamesFrom(file, 4, 3) will return the IASTName corresponding to foo 
+     * 
+     * @param tu 
+     * @param offset
+     * @param length
+     * @param lang
+     * @return
+     */
+    public static IASTName[] getSelectedNamesFrom(IASTTranslationUnit tu, int offset, int length, ParserLanguage lang) {
+        IASTNode node = null;
+        try{
+            node = tu.selectNodeForLocation(tu.getFilePath(), offset, length); // TODO Devin untested tu.getContainingFilename() ...
+        } 
+        catch (ParseError er){}
+        catch ( VirtualMachineError vmErr){
+            if (vmErr instanceof OutOfMemoryError){
+                org.eclipse.cdt.internal.core.model.Util.log(null, "Open Declarations Out Of Memory error: " + vmErr.getMessage() + " on File: " + tu.getContainingFilename(), ICLogConstants.CDT); //$NON-NLS-1$ //$NON-NLS-2$
+            }
+        }
+        catch (Exception ex){}
+        
+        finally{
+            if (node == null){
+                return EMPTY_NAME_LIST;
+            }
+        }
+    
+        if (node instanceof IASTName) {
+            IASTName[] results = new IASTName[1];
+            results[0] = (IASTName)node;
+            return results;
+        }
+        
+        ASTVisitor collector = null;
+        if (lang == ParserLanguage.CPP) {
+            collector = new CPPNameCollector();
+        } else {
+            collector = new CNameCollector();
+        }
+        
+        node.accept( collector );
+        
+        List names = null;
+        if (collector instanceof CPPNameCollector) {
+            names = ((CPPNameCollector)collector).nameList;
+        } else {
+            names = ((CNameCollector)collector).nameList;
+        }
+        
+        IASTName[] results = new IASTName[names.size()];
+        for(int i=0; i<names.size(); i++) {
+            if (names.get(i) instanceof IASTName)
+                results[i] = (IASTName)names.get(i);
+        }
+        
+        return results;
+    }
+
+    
+    /**
+     * This is used to get an array of selected names in an IFile based on the offset and length 
+     * into that IFile.
+     * 
+     * NOTE:  Invoking this method causes a parse, if an IASTTranslationUnit is already obtained then
+     * invoke getSelectedNamesFrom(IASTTranslationUnit, int, int, ParserLanguage) instead.
      * 
      * ex: IFile contains: int foo;
      * then getSelectedNamesFrom(file, 4, 3) will return the IASTName corresponding to foo 
@@ -340,4 +409,18 @@ public class DOMSearchUtil {
         }
         public int size() { return nameList.size(); } 
     }
+    
+    public static ParserLanguage getLanguage( IPath path, IProject project )
+    {    
+        ICFileType type = CCorePlugin.getDefault().getFileType(project, path.lastSegment());
+        boolean isHeader= type.isHeader();
+        if( isHeader ) 
+            return ParserLanguage.CPP; // assumption
+        String lid = type.getLanguage().getId();
+        if( lid.equals(ICFileTypeConstants.LANG_CXX))
+            return ParserLanguage.CPP;
+        if( lid.equals( ICFileTypeConstants.LANG_C ) )
+            return ParserLanguage.C;
+        return ParserLanguage.CPP;
+    }
 }
diff --git a/core/org.eclipse.cdt.ui.tests/src/org/eclipse/cdt/ui/tests/DOMAST/DOMAST.java b/core/org.eclipse.cdt.ui.tests/src/org/eclipse/cdt/ui/tests/DOMAST/DOMAST.java
index 6e111d2a60a..362ec79b3ad 100644
--- a/core/org.eclipse.cdt.ui.tests/src/org/eclipse/cdt/ui/tests/DOMAST/DOMAST.java
+++ b/core/org.eclipse.cdt.ui.tests/src/org/eclipse/cdt/ui/tests/DOMAST/DOMAST.java
@@ -1226,6 +1226,11 @@ public class DOMAST extends ViewPart {
     				IFile aFile = ((CEditor)editor).getInputFile();
     				
     				// check if the file is a valid "compilation unit" (based on file extension)
+                    if (aFile == null) {
+                        MessageDialog.openInformation(shell, DOMAST.VIEW_NAME, NOT_VALID_COMPILATION_UNIT);
+                        return null;
+                    }
+                    
     				String ext = aFile.getFileExtension().toUpperCase();
     				if (!(ext.equals(EXTENSION_C) || ext.equals(EXTENSION_CC) || ext.equals(EXTENSION_CPP) || ext.equals(EXTENSION_CXX))) {
     					MessageDialog.openInformation(shell, DOMAST.VIEW_NAME, NOT_VALID_COMPILATION_UNIT);
@@ -1247,6 +1252,10 @@ public class DOMAST extends ViewPart {
 	}
     	
     public static ParserLanguage getLanguageFromFile(IFile file) {
+        if (file == null) { // assume CPP
+            return ParserLanguage.CPP;
+        }
+        
        	IProject project = file.getProject();
     	ICFileType type = CCorePlugin.getDefault().getFileType(project, file.getFullPath().lastSegment());
     	String lid = type.getLanguage().getId();
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/FindAction.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/FindAction.java
index ad5370992b9..6ac4c7481a9 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/FindAction.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/FindAction.java
@@ -19,6 +19,7 @@ import org.eclipse.cdt.core.CCorePlugin;
 import org.eclipse.cdt.core.ICLogConstants;
 import org.eclipse.cdt.core.dom.CDOM;
 import org.eclipse.cdt.core.dom.IASTServiceProvider;
+import org.eclipse.cdt.core.dom.IASTServiceProvider.UnsupportedDialectException;
 import org.eclipse.cdt.core.dom.ast.ASTTypeUtil;
 import org.eclipse.cdt.core.dom.ast.ASTVisitor;
 import org.eclipse.cdt.core.dom.ast.DOMException;
@@ -31,6 +32,7 @@ import org.eclipse.cdt.core.dom.ast.IFunctionType;
 import org.eclipse.cdt.core.dom.ast.IType;
 import org.eclipse.cdt.core.dom.ast.c.ICExternalBinding;
 import org.eclipse.cdt.core.model.ICElement;
+import org.eclipse.cdt.core.model.ICProject;
 import org.eclipse.cdt.core.parser.ParseError;
 import org.eclipse.cdt.core.parser.ParserLanguage;
 import org.eclipse.cdt.core.search.DOMSearchUtil;
@@ -148,9 +150,10 @@ public abstract class FindAction extends SelectionParseAction {
 	 	if( obj == null || !(obj instanceof ICElement ) ){
 	 		operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
 	 		return;
-	 	} else {
-	 		clearStatusLine();
 	 	}
+
+        clearStatusLine();
+
 		ICElement element = (ICElement) obj;
 		
 		CSearchQuery job = createSearchQuery( element.getElementName(), CSearchUtil.getSearchForFromElement(element));
@@ -191,23 +194,18 @@ public abstract class FindAction extends SelectionParseAction {
 		
 		SelSearchNode selNode = getSelection( sel );
 		
-		IFile resourceFile = null;
-        if (fEditor.getEditorInput() instanceof ExternalEditorInput) {
-            // TODO Devin should be able to implement this somehow, see PR 78118
-            operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
-            return;
-        }
+        IASTNode foundNode = null;
+        IASTTranslationUnit tu = null;
+        ParserLanguage lang = null;
+        String file = null;
         
-        resourceFile = fEditor.getInputFile();
-        
-		IASTTranslationUnit tu = null;
-		IASTNode foundNode = null;
-        
-        ParseWithProgress runnable = new ParseWithProgress(resourceFile);
+        ParseWithProgress runnable = new ParseWithProgress();
         ProgressMonitorDialog progressMonitor = new ProgressMonitorDialog(fEditor.getSite().getShell());
         try {
             progressMonitor.run(true, true, runnable);
             tu = runnable.getTu();
+            file = runnable.getFile();
+            lang = runnable.getLang();
         } catch (InvocationTargetException e1) {
             operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
             return;
@@ -215,15 +213,7 @@ public abstract class FindAction extends SelectionParseAction {
             operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
             return;
         }
-        
-		String file=null;
-		if( resourceFile != null )
-			file = resourceFile.getLocation().toOSString();
-		else
-		{
-			if( resourceFile instanceof ExternalEditorInput )
-				file = ((ExternalEditorInput)resourceFile).getStorage().getFullPath().toOSString();
-		}
+        		
 		try{
 			foundNode = tu.selectNodeForLocation(file, selNode.selStart, selNode.selEnd - selNode.selStart);
 		} 
@@ -231,7 +221,7 @@ public abstract class FindAction extends SelectionParseAction {
 		catch (Exception ex){}
 		catch ( VirtualMachineError vmErr){
 			if (vmErr instanceof OutOfMemoryError){
-				org.eclipse.cdt.internal.core.model.Util.log(null, "Selection Search Out Of Memory error: " + vmErr.getMessage() + " on File: " + resourceFile.getName(), ICLogConstants.CDT); //$NON-NLS-1$ //$NON-NLS-2$
+				org.eclipse.cdt.internal.core.model.Util.log(null, "Selection Search Out Of Memory error: " + vmErr.getMessage() + " on File: " + file, ICLogConstants.CDT); //$NON-NLS-1$ //$NON-NLS-2$
 			}
 		}
 		
@@ -240,7 +230,7 @@ public abstract class FindAction extends SelectionParseAction {
 			foundName = (IASTName)foundNode;
 		} else {
 			ASTVisitor collector = null;
-			if (DOMSearchUtil.getLanguageFromFile(resourceFile) == ParserLanguage.CPP) {
+			if (lang == ParserLanguage.CPP) {
 				collector = new DOMSearchUtil.CPPNameCollector();
 			} else {
 				collector = new DOMSearchUtil.CNameCollector();
@@ -289,28 +279,62 @@ public abstract class FindAction extends SelectionParseAction {
     
     private class ParseWithProgress implements IRunnableWithProgress 
     {
-        private IFile file=null;
         private IASTTranslationUnit tu = null;
+        private String file=null;
+        private ParserLanguage lang=null;
         
-        public ParseWithProgress(IFile file) {
-            this.file = file;
-        }
+        public ParseWithProgress() {}
 
         public void run(IProgressMonitor monitor) {
-            try {
-                tu = CDOM.getInstance().getASTService().getTranslationUnit(
-                        file,
-                        CDOM.getInstance().getCodeReaderFactory(
-                                CDOM.PARSE_WORKING_COPY_WHENEVER_POSSIBLE));
-            } catch (IASTServiceProvider.UnsupportedDialectException e) {
-                operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
-                return;
+            if (fEditor.getEditorInput() instanceof ExternalEditorInput) {
+                ExternalEditorInput input = (ExternalEditorInput)fEditor.getEditorInput();
+                try {
+                    // get the project for the external editor input's translation unit
+                    ICElement project = input.getTranslationUnit();
+                    while (!(project instanceof ICProject) && project != null) {
+                        project = project.getParent();
+                    }
+                    
+                    if (project instanceof ICProject) {
+                        tu = CDOM.getInstance().getASTService().getTranslationUnit(input.getStorage(), ((ICProject)project).getProject());
+                        lang = DOMSearchUtil.getLanguage(input.getStorage().getFullPath(), ((ICProject)project).getProject());
+                    }
+                } catch (UnsupportedDialectException e) {
+                    operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
+                    return;
+                }
+                
+                file = input.getStorage().getFullPath().toOSString();
+            } else {
+                IFile resourceFile = null;
+                resourceFile = fEditor.getInputFile();
+                
+                try {
+                    tu = CDOM.getInstance().getASTService().getTranslationUnit(
+                            resourceFile,
+                            CDOM.getInstance().getCodeReaderFactory(
+                                    CDOM.PARSE_WORKING_COPY_WHENEVER_POSSIBLE));
+                } catch (IASTServiceProvider.UnsupportedDialectException e) {
+                    operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
+                    return;
+                }
+                
+                file = resourceFile.getLocation().toOSString();
+                lang = DOMSearchUtil.getLanguageFromFile(resourceFile);
             }
         }
 
         public IASTTranslationUnit getTu() {
             return tu;
         }
+
+        public String getFile() {
+            return file;
+        }
+
+        public ParserLanguage getLang() {
+            return lang;
+        }
     };
 	
     abstract protected String getScopeDescription(); 
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/FindRefsAction.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/FindRefsAction.java
index 09d4b91c539..350f4276659 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/FindRefsAction.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/FindRefsAction.java
@@ -10,15 +10,12 @@
  ******************************************************************************/
 package org.eclipse.cdt.internal.ui.search.actions;
 
-import org.eclipse.cdt.core.model.ICElement;
 import org.eclipse.cdt.core.search.ICSearchConstants;
 import org.eclipse.cdt.core.search.ICSearchScope;
 import org.eclipse.cdt.core.search.SearchEngine;
 import org.eclipse.cdt.core.search.ICSearchConstants.LimitTo;
-import org.eclipse.cdt.internal.core.model.CProject;
 import org.eclipse.cdt.internal.ui.editor.CEditor;
 import org.eclipse.cdt.internal.ui.search.CSearchMessages;
-import org.eclipse.core.resources.IProject;
 import org.eclipse.ui.IWorkbenchSite;
 
 
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/OpenDeclarationsAction.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/OpenDeclarationsAction.java
index e056306d5f5..c477dc60b0b 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/OpenDeclarationsAction.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/OpenDeclarationsAction.java
@@ -14,9 +14,15 @@ package org.eclipse.cdt.internal.ui.search.actions;
 import java.util.Iterator;
 import java.util.Set;
 
+import org.eclipse.cdt.core.dom.CDOM;
+import org.eclipse.cdt.core.dom.IASTServiceProvider;
+import org.eclipse.cdt.core.dom.IASTServiceProvider.UnsupportedDialectException;
 import org.eclipse.cdt.core.dom.ast.IASTFileLocation;
 import org.eclipse.cdt.core.dom.ast.IASTName;
+import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
 import org.eclipse.cdt.core.model.ICElement;
+import org.eclipse.cdt.core.model.ICProject;
+import org.eclipse.cdt.core.parser.ParserLanguage;
 import org.eclipse.cdt.core.parser.ParserUtil;
 import org.eclipse.cdt.core.search.DOMSearchUtil;
 import org.eclipse.cdt.core.search.ICSearchConstants;
@@ -25,12 +31,10 @@ import org.eclipse.cdt.core.search.SearchEngine;
 import org.eclipse.cdt.internal.core.model.CProject;
 import org.eclipse.cdt.internal.ui.editor.CEditor;
 import org.eclipse.cdt.internal.ui.editor.CEditorMessages;
-import org.eclipse.cdt.internal.ui.editor.ITranslationUnitEditorInput;
 import org.eclipse.cdt.internal.ui.util.ExternalEditorInput;
 import org.eclipse.cdt.ui.CUIPlugin;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
-import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.jface.dialogs.ProgressMonitorDialog;
@@ -79,34 +83,47 @@ public class OpenDeclarationsAction extends SelectionParseAction implements IUpd
 				int selectionStart = selNode.selStart;
 				int selectionLength = selNode.selEnd - selNode.selStart;
                 
-                IFile resourceFile = null;
-                
                 IASTName[] selectedNames = BLANK_NAME_ARRAY;
-                if (fEditor.getEditorInput() instanceof ExternalEditorInput) {
-                    if( fEditor.getEditorInput() instanceof ITranslationUnitEditorInput )
-                    {
-                        ITranslationUnitEditorInput ip = (ITranslationUnitEditorInput) fEditor.getEditorInput();
-                        IResource r = ip.getTranslationUnit().getUnderlyingResource();
-                        if( r.getType() == IResource.FILE )
-                            resourceFile = (IFile) r;
-                        else
-                        {
-                            operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
-                            return;
-
-                        }
-                    }
-                }
-                else
-                    resourceFile = fEditor.getInputFile();
+                IASTTranslationUnit tu=null;
+                ParserLanguage lang=null;
                 
-
-                if (resourceFile != null) 
+                if (fEditor.getEditorInput() instanceof ExternalEditorInput) {
+                    ExternalEditorInput input = (ExternalEditorInput)fEditor.getEditorInput();
+                    try {
+                        // get the project for the external editor input's translation unit
+                        ICElement project = input.getTranslationUnit();
+                        while (!(project instanceof ICProject) && project != null) {
+                            project = project.getParent();
+                        }
+                        
+                        if (project instanceof ICProject) {
+                            tu = CDOM.getInstance().getASTService().getTranslationUnit(input.getStorage(), ((ICProject)project).getProject());
+                            lang = DOMSearchUtil.getLanguage(input.getStorage().getFullPath(), ((ICProject)project).getProject());
+                            projectName = ((ICProject)project).getElementName();
+                        }
+                    } catch (UnsupportedDialectException e) {
+                        operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
+                        return;
+                    }
+                } else {
+                    IFile resourceFile = null;
+                    resourceFile = fEditor.getInputFile();
+                    
+                    try {
+                        tu = CDOM.getInstance().getASTService().getTranslationUnit(
+                                resourceFile,
+                                CDOM.getInstance().getCodeReaderFactory(
+                                        CDOM.PARSE_WORKING_COPY_WHENEVER_POSSIBLE));
+                    } catch (IASTServiceProvider.UnsupportedDialectException e) {
+                        operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
+                        return;
+                    }
+                    lang = DOMSearchUtil.getLanguageFromFile(resourceFile);
                     projectName = findProjectName(resourceFile);
+                }
                 
                 // step 1 starts here
-                if (resourceFile != null)
-                    selectedNames = DOMSearchUtil.getSelectedNamesFrom(resourceFile, selectionStart, selectionLength);
+                selectedNames = DOMSearchUtil.getSelectedNamesFrom(tu, selectionStart, selectionLength, lang);
                 				
 				if (selectedNames.length > 0 && selectedNames[0] != null) { // just right, only one name selected
 					IASTName searchName = selectedNames[0];
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/OpenDefinitionAction.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/OpenDefinitionAction.java
index a27f7f7a40b..7a7f758ad51 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/OpenDefinitionAction.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/search/actions/OpenDefinitionAction.java
@@ -13,9 +13,15 @@ package org.eclipse.cdt.internal.ui.search.actions;
 import java.util.Iterator;
 import java.util.Set;
 
+import org.eclipse.cdt.core.dom.CDOM;
+import org.eclipse.cdt.core.dom.IASTServiceProvider;
+import org.eclipse.cdt.core.dom.IASTServiceProvider.UnsupportedDialectException;
 import org.eclipse.cdt.core.dom.ast.IASTFileLocation;
 import org.eclipse.cdt.core.dom.ast.IASTName;
+import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
 import org.eclipse.cdt.core.model.ICElement;
+import org.eclipse.cdt.core.model.ICProject;
+import org.eclipse.cdt.core.parser.ParserLanguage;
 import org.eclipse.cdt.core.parser.ParserUtil;
 import org.eclipse.cdt.core.search.DOMSearchUtil;
 import org.eclipse.cdt.core.search.ICSearchConstants;
@@ -24,12 +30,10 @@ import org.eclipse.cdt.core.search.SearchEngine;
 import org.eclipse.cdt.internal.core.model.CProject;
 import org.eclipse.cdt.internal.ui.editor.CEditor;
 import org.eclipse.cdt.internal.ui.editor.CEditorMessages;
-import org.eclipse.cdt.internal.ui.editor.ITranslationUnitEditorInput;
 import org.eclipse.cdt.internal.ui.util.ExternalEditorInput;
 import org.eclipse.cdt.ui.CUIPlugin;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
-import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.jface.dialogs.ProgressMonitorDialog;
@@ -91,34 +95,47 @@ public class OpenDefinitionAction extends SelectionParseAction implements
                 int selectionStart = selNode.selStart;
                 int selectionLength = selNode.selEnd - selNode.selStart;
                 
-                IFile resourceFile = null;
-                
                 IASTName[] selectedNames = BLANK_NAME_ARRAY;
-                if (fEditor.getEditorInput() instanceof ExternalEditorInput) {
-                    if( fEditor.getEditorInput() instanceof ITranslationUnitEditorInput )
-                    {
-                        ITranslationUnitEditorInput ip = (ITranslationUnitEditorInput) fEditor.getEditorInput();
-                        IResource r = ip.getTranslationUnit().getUnderlyingResource();
-                        if( r.getType() == IResource.FILE )
-                            resourceFile = (IFile) r;
-                        else
-                        {
-                            operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
-                            return;
-
-                        }
-                    }
-                }
-                else
-                    resourceFile = fEditor.getInputFile();
+                IASTTranslationUnit tu=null;
+                ParserLanguage lang=null;
                 
-
-                if (resourceFile != null) 
+                if (fEditor.getEditorInput() instanceof ExternalEditorInput) {
+                    ExternalEditorInput input = (ExternalEditorInput)fEditor.getEditorInput();
+                    try {
+                        // get the project for the external editor input's translation unit
+                        ICElement project = input.getTranslationUnit();
+                        while (!(project instanceof ICProject) && project != null) {
+                            project = project.getParent();
+                        }
+                        
+                        if (project instanceof ICProject) {
+                            tu = CDOM.getInstance().getASTService().getTranslationUnit(input.getStorage(), ((ICProject)project).getProject());
+                            lang = DOMSearchUtil.getLanguage(input.getStorage().getFullPath(), ((ICProject)project).getProject());
+                            projectName = ((ICProject)project).getElementName();
+                        }
+                    } catch (UnsupportedDialectException e) {
+                        operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
+                        return;
+                    }
+                } else {
+                    IFile resourceFile = null;
+                    resourceFile = fEditor.getInputFile();
+                    
+                    try {
+                        tu = CDOM.getInstance().getASTService().getTranslationUnit(
+                                resourceFile,
+                                CDOM.getInstance().getCodeReaderFactory(
+                                        CDOM.PARSE_WORKING_COPY_WHENEVER_POSSIBLE));
+                    } catch (IASTServiceProvider.UnsupportedDialectException e) {
+                        operationNotAvailable(CSEARCH_OPERATION_OPERATION_UNAVAILABLE_MESSAGE);
+                        return;
+                    }
+                    lang = DOMSearchUtil.getLanguageFromFile(resourceFile);
                     projectName = findProjectName(resourceFile);
+                }
                 
                 // step 1 starts here
-                if (resourceFile != null)
-                    selectedNames = DOMSearchUtil.getSelectedNamesFrom(resourceFile, selectionStart, selectionLength);
+                selectedNames = DOMSearchUtil.getSelectedNamesFrom(tu, selectionStart, selectionLength, lang);
                                 
                 if (selectedNames.length > 0 && selectedNames[0] != null) { // just right, only one name selected
                     IASTName searchName = selectedNames[0];