Bug 418493 - [Content Assist] Show default values within parameter hints

Preferences:
- Displaying parameters with default argument
- Displaying default arguments

Default arguments for functions and templates.

Conflicts:
	core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/DOMCompletionProposalComputer.java

Conflicts:
	core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests.java
	
Rebased to changed parent

Change-Id: Ifb505f5723dc26212c34f492d3d49b7badf366ea
Signed-off-by: Thomas Corbat <tcorbat@hsr.ch>
Reviewed-on: https://git.eclipse.org/r/30646
Reviewed-by: Sergey Prigogin <eclipse.sprigogin@gmail.com>
Tested-by: Hudson CI

6 files changed, 177 insertions, 3 deletions

diff --git a/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests.java b/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests.java
index 2d0ab6c3062..ffd6cd8f83b 100644
--- a/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests.java
+++ b/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/contentassist2/CompletionTests.java
@@ -26,11 +26,15 @@ import junit.framework.Test;
 
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
+import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.jface.text.IDocument;
 
 import org.eclipse.cdt.core.CCorePlugin;
 import org.eclipse.cdt.core.testplugin.TestScannerProvider;
 import org.eclipse.cdt.core.testplugin.util.BaseTestCase;
+import org.eclipse.cdt.ui.CUIPlugin;
+
+import org.eclipse.cdt.internal.ui.text.contentassist.ContentAssistPreference;
 
 import static org.eclipse.cdt.ui.tests.text.contentassist2.AbstractContentAssistTest.CompareType.*;
 
@@ -244,6 +248,20 @@ public class CompletionTests extends AbstractContentAssistTest {
 		assertContentAssistResults(fCursorOffset, expected, false, CONTEXT);
 	}
 
+	private static void setDisplayDefaultArguments(boolean value) {
+		IPreferenceStore preferenceStore = getPreferenceStore();
+		preferenceStore.setValue(ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_ARGUMENTS, value);
+	}
+
+	private static void setDisplayDefaultedParameters(boolean value) {
+		IPreferenceStore preferenceStore = getPreferenceStore();
+		preferenceStore.setValue(ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_PARAMETERS_WITH_DEFAULT_ARGUMENT, value);
+	}
+
+	private static IPreferenceStore getPreferenceStore() {
+		return CUIPlugin.getDefault().getPreferenceStore();
+	}
+
 	//void gfunc() {C1 v; v.m/*cursor*/
 	public void testLocalVariable() throws Exception {
 		final String[] expected= {
@@ -1415,4 +1433,80 @@ public class CompletionTests extends AbstractContentAssistTest {
 		final String[] expectedID = { "C1", "C2", "C3" };
 		assertContentAssistResults(fCursorOffset, expectedID, true, ID);
 	}
+
+	//	void default_argument(int i = 23) {
+	//		default_arg/*cursor*/
+	//	}
+	public void testDefaultFunctionArgument() throws Exception {
+		setDisplayDefaultedParameters(true);
+		setDisplayDefaultArguments(true);
+		final String[] expectedDisplay = { "default_argument(int i = 23) : void" };
+		assertContentAssistResults(fCursorOffset, expectedDisplay, true, DISPLAY);
+		final String[] expectedReplacement = { "default_argument()" };
+		assertContentAssistResults(fCursorOffset, expectedReplacement, true, REPLACEMENT);
+	}
+
+	//	void default_argument(int i = 23) {
+	//		default_arg/*cursor*/
+	//	}
+	public void testNoDefaultFunctionArgument() throws Exception {
+		setDisplayDefaultedParameters(true);
+		setDisplayDefaultArguments(false);
+		final String[] expectedDisplay = { "default_argument(int i) : void" };
+		assertContentAssistResults(fCursorOffset, expectedDisplay, true, DISPLAY);
+	}
+
+	//	void default_argument(int i = 23) {
+	//		default_arg/*cursor*/
+	//	}
+	public void testNoDefaultFunctionParameter() throws Exception {
+		setDisplayDefaultedParameters(false);
+		setDisplayDefaultArguments(false);
+		final String[] expectedDisplay = { "default_argument() : void" };
+		assertContentAssistResults(fCursorOffset, expectedDisplay, true, DISPLAY);
+	}
+
+	//	template<typename T = int>
+	//	struct default_argument {};
+	//	default_arg/*cursor*/
+	public void testDefaultTemplateArgument() throws Exception {
+		setDisplayDefaultedParameters(true);
+		setDisplayDefaultArguments(true);
+		final String[] expectedDisplay = { "default_argument<typename T = int>" };
+		assertContentAssistResults(fCursorOffset, expectedDisplay, true, DISPLAY);
+		final String[] expectedReplacement = { "default_argument<>" };
+		assertContentAssistResults(fCursorOffset, expectedReplacement, true, REPLACEMENT);
+	}
+
+	//	template<typename T = int>
+	//	struct default_argument {};
+	//	default_arg/*cursor*/
+	public void testNoDefaultTemplateArgument() throws Exception {
+		setDisplayDefaultedParameters(true);
+		setDisplayDefaultArguments(false);
+		final String[] expectedDisplay = { "default_argument<typename T>" };
+		assertContentAssistResults(fCursorOffset, expectedDisplay, true, DISPLAY);
+	}
+
+	//	template<typename T = int>
+	//	struct default_argument {};
+	//	default_arg/*cursor*/
+	public void testNoDefaultTemplateParameter() throws Exception {
+		setDisplayDefaultedParameters(false);
+		setDisplayDefaultArguments(false);
+		final String[] expectedDisplay = { "default_argument<>" };
+		assertContentAssistResults(fCursorOffset, expectedDisplay, true, DISPLAY);
+	}
+
+	//	template<typename T>
+	//	struct tpl {};
+	//	template<typename T1, typename T2 = tpl<T1>>
+	//	struct other_tpl {};
+	//	other_tpl/*cursor*/
+	public void testDefaultTemplateTemplateArgument() throws Exception {
+		setDisplayDefaultedParameters(true);
+		setDisplayDefaultArguments(true);
+		final String[] expectedDisplay = { "other_tpl<typename T1, typename T2 = tpl<T1>>" };
+		assertContentAssistResults(fCursorOffset, expectedDisplay, true, DISPLAY);
+	}
 }
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/CodeAssistPreferencePage.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/CodeAssistPreferencePage.java
index 3dbef4bcb72..0da996569f7 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/CodeAssistPreferencePage.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/CodeAssistPreferencePage.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2002, 2011 QNX Software Systems and others.
+ * Copyright (c) 2002, 2014 QNX Software Systems and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -11,6 +11,7 @@
  *     IBM Corporation
  *     Kirk Beitz (Nokia)
  *     Jens Elmenthaler - http://bugs.eclipse.org/173458 (camel case completion)
+ *     Thomas Corbat
  *******************************************************************************/
 
 package org.eclipse.cdt.internal.ui.preferences;
@@ -20,13 +21,13 @@ import java.util.ArrayList;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.layout.GridLayout;
+import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Group;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.PlatformUI;
 
-
 import org.eclipse.cdt.internal.ui.ICHelpContextIds;
 import org.eclipse.cdt.internal.ui.preferences.OverlayPreferenceStore.OverlayKey;
 import org.eclipse.cdt.internal.ui.text.contentassist.ContentAssistPreference;
@@ -56,6 +57,8 @@ public class CodeAssistPreferencePage extends AbstractPreferencePage {
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, ContentAssistPreference.AUTOACTIVATION_TRIGGERS_ARROW));
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, ContentAssistPreference.AUTOACTIVATION_TRIGGERS_DOUBLECOLON));
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, ContentAssistPreference.AUTOACTIVATION_TRIGGERS_REPLACE_DOT_WITH_ARROW));
+		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_PARAMETERS_WITH_DEFAULT_ARGUMENT));
+		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_ARGUMENTS));
 //		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, ContentAssistPreference.SHOW_DOCUMENTED_PROPOSALS));
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, ContentAssistPreference.ORDER_PROPOSALS));
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, ContentAssistPreference.SHOW_CAMEL_CASE_MATCHES));
@@ -149,6 +152,22 @@ public class CodeAssistPreferencePage extends AbstractPreferencePage {
 		label = PreferencesMessages.CEditorPreferencePage_ContentAssistPage_autoActivationDelay; 
 		addTextField(enableGroup, label, ContentAssistPreference.AUTOACTIVATION_DELAY, 4, 0, true);
 
+		//&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
+		// The following items are grouped for Default Arguments
+		label = PreferencesMessages.CEditorPreferencePage_ContentAssistPage_defaultArgumentsGroupTitle;
+		Group defaultArgumentsGroup = addGroupBox(contentAssistComposite, label, 2);
+
+		label = PreferencesMessages.CEditorPreferencePage_ContentAssistPage_displayParametersWithDefaultArgument;
+		Button displayDefaultedParameters = addCheckBox(defaultArgumentsGroup, label,
+				ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_PARAMETERS_WITH_DEFAULT_ARGUMENT, 0);
+
+		label = PreferencesMessages.CEditorPreferencePage_ContentAssistPage_displayDefaultArguments;
+		Button displayDefaultArguments = addCheckBox(defaultArgumentsGroup, label,
+				ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_ARGUMENTS, 0);
+
+		createDependency(displayDefaultedParameters,
+				ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_PARAMETERS_WITH_DEFAULT_ARGUMENT, displayDefaultArguments);
+
 		initializeFields();
 
 		return contentAssistComposite;
@@ -171,6 +190,8 @@ public class CodeAssistPreferencePage extends AbstractPreferencePage {
 		store.setDefault(ContentAssistPreference.AUTOACTIVATION_TRIGGERS_DOUBLECOLON, true);
 		store.setDefault(ContentAssistPreference.AUTOACTIVATION_TRIGGERS_REPLACE_DOT_WITH_ARROW, true);
 		store.setDefault(ContentAssistPreference.AUTOACTIVATION_DELAY, 500);
+		store.setDefault(ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_PARAMETERS_WITH_DEFAULT_ARGUMENT, true);
+		store.setDefault(ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_ARGUMENTS, true);
 
 		store.setDefault(ContentAssistPreference.AUTOINSERT, true);
 		store.setDefault(ContentAssistPreference.PREFIX_COMPLETION, true);
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/PreferencesMessages.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/PreferencesMessages.java
index a92de73695c..074be583b9b 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/PreferencesMessages.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/PreferencesMessages.java
@@ -14,6 +14,7 @@
  *     Kirk Beitz (Nokia)
  *     James Blackburn (Broadcom Corp.)
  *     Jens Elmenthaler - http://bugs.eclipse.org/173458 (camel case completion)
+ *     Thomas Corbat (IFS)
  *******************************************************************************/
 package org.eclipse.cdt.internal.ui.preferences;
 
@@ -49,6 +50,9 @@ public final class PreferencesMessages extends NLS {
 	public static String CEditorPreferencePage_ContentAssistPage_autoActivationEnableDoubleColon;
 	public static String CEditorPreferencePage_ContentAssistPage_autoActivationEnableReplaceDotWithArrow;
 	public static String CEditorPreferencePage_ContentAssistPage_autoActivationDelay;
+	public static String CEditorPreferencePage_ContentAssistPage_defaultArgumentsGroupTitle;
+	public static String CEditorPreferencePage_ContentAssistPage_displayParametersWithDefaultArgument;
+	public static String CEditorPreferencePage_ContentAssistPage_displayDefaultArguments;
 	public static String CEditorPreferencePage_ContentAssistPage_proposalFilterSelect;
 	public static String CEditorPreferencePage_ContentAssistPage_completionProposalBackgroundColor;
 	public static String CEditorPreferencePage_ContentAssistPage_completionProposalForegroundColor;
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/PreferencesMessages.properties b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/PreferencesMessages.properties
index 1d3c15bcaa7..c3f4874407c 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/PreferencesMessages.properties
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/PreferencesMessages.properties
@@ -45,6 +45,9 @@ CEditorPreferencePage_ContentAssistPage_completionProposalTimeoutToolTip=If a pr
 CEditorPreferencePage_ContentAssistPage_parameterBackgroundColor=Parameter hint background
 CEditorPreferencePage_ContentAssistPage_parameterForegroundColor=Parameter hint foreground
 CEditorPreferencePage_ContentAssistPage_sortingSection_title=Sorting and Filtering
+CEditorPreferencePage_ContentAssistPage_defaultArgumentsGroupTitle=Default Arguments
+CEditorPreferencePage_ContentAssistPage_displayParametersWithDefaultArgument=Display parameters with default argument
+CEditorPreferencePage_ContentAssistPage_displayDefaultArguments=Display default arguments
 CEditorPreferencePage_sourceHoverBackgroundColor=Source hover background
 
 # {0} will be replaced by the keyboard shortcut for the command (e.g. "Ctrl+Space", or "no shortcut") 
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/ContentAssistPreference.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/ContentAssistPreference.java
index bac11da36eb..257486d8ae6 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/ContentAssistPreference.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/ContentAssistPreference.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- *  Copyright (c) 2000, 2011 IBM Corporation and others.
+ *  Copyright (c) 2000, 2014 IBM Corporation and others.
  *  All rights reserved. This program and the accompanying materials
  *  are made available under the terms of the Eclipse Public License v1.0
  *  which accompanies this distribution, and is available at
@@ -9,6 +9,7 @@
  *     IBM - Initial API and implementation
  *     Anton Leherbauer (Wind River Systems)
  *     Kirk Beitz (Nokia)
+ *     Thomas Corbat (IFS)
  *******************************************************************************/
 package org.eclipse.cdt.internal.ui.text.contentassist;
 
@@ -60,6 +61,10 @@ public class ContentAssistPreference {
 	public final static String AUTOACTIVATION_TRIGGERS_ARROW= "content_assist_autoactivation_trigger_arrow"; //$NON-NLS-1$
 	public final static String AUTOACTIVATION_TRIGGERS_DOUBLECOLON= "content_assist_autoactivation_trigger_doublecolon"; //$NON-NLS-1$
 	public final static String AUTOACTIVATION_TRIGGERS_REPLACE_DOT_WITH_ARROW= "content_assist_autoactivation_trigger_replace_dot_with_arrow"; //$NON-NLS-1$
+	/** Preference key for display of defaulted parameters in content assist  */
+	public final static String DEFAULT_ARGUMENT_DISPLAY_PARAMETERS_WITH_DEFAULT_ARGUMENT = "content_assist_default_argument_display_parameters_with_default_argument"; //$NON-NLS-1$
+	/** Preference key for display of default arguments in content assist  */
+	public final static String DEFAULT_ARGUMENT_DISPLAY_ARGUMENTS = "content_assist_default_argument_display_arguments"; //$NON-NLS-1$
 //	/** Preference key for visibility of proposals (unused) */
 //	public final static String SHOW_DOCUMENTED_PROPOSALS= "content_assist_show_visible_proposals"; //$NON-NLS-1$
 	/** Preference key for alphabetic ordering of proposals */
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/DOMCompletionProposalComputer.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/DOMCompletionProposalComputer.java
index d336de28ecd..5c7323936f6 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/DOMCompletionProposalComputer.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/DOMCompletionProposalComputer.java
@@ -20,6 +20,7 @@ import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.jface.text.BadLocationException;
 import org.eclipse.jface.text.IDocument;
@@ -67,6 +68,8 @@ import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunctionTemplate;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPMember;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPMethod;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPNamespace;
+import org.eclipse.cdt.core.dom.ast.cpp.ICPPParameter;
+import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateArgument;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateNonTypeParameter;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameter;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateTemplateParameter;
@@ -99,6 +102,8 @@ import org.eclipse.cdt.internal.ui.viewsupport.CElementImageProvider;
  * @author Bryan Wilkinson
  */
 public class DOMCompletionProposalComputer extends ParsingBasedProposalComputer {
+	private static final String HASH = "#"; //$NON-NLS-1$;
+	private static final String DEFAULT_ARGUMENT_PATTERN = " = {0}"; //$NON-NLS-1$;
 	private static final String TEMPLATE_PARAMETER_PATTERN = "template<{0}> class"; //$NON-NLS-1$;
 	private static final String TYPENAME = "typename"; //$NON-NLS-1$;
 	private static final String ELLIPSIS = "..."; //$NON-NLS-1$;
@@ -387,8 +392,14 @@ public class DOMCompletionProposalComputer extends ParsingBasedProposalComputer
 		StringBuilder representation = new StringBuilder();
 
 		final String parameterDelimiter = context.getTemplateParameterDelimiter();
+		final boolean addDefaultedParameters = isDisplayDefaultedParameters();
+		final boolean addDefaultArguments = isDisplayDefaultArguments();
 		for (int i = 0; i < parameters.length; i++) {
 			ICPPTemplateParameter parameter = parameters[i];
+			ICPPTemplateArgument defaultValue = parameter.getDefaultValue();
+			if (!addDefaultedParameters && defaultValue != null) {
+				break;
+			}
 			if (i > 0) {
 				representation.append(parameterDelimiter);
 			}
@@ -408,6 +419,15 @@ public class DOMCompletionProposalComputer extends ParsingBasedProposalComputer
 			}
 			representation.append(' ');
 			representation.append(parameter.getName());
+			if (addDefaultArguments && defaultValue != null) {
+				String defaultArgumentRepresentation = MessageFormat.format(DEFAULT_ARGUMENT_PATTERN, defaultValue);
+				for (int parameterIndex = 0; parameterIndex < i; parameterIndex++) {
+					String templateArgumentID = HASH + parameterIndex;
+					String templateArgumentValue = parameters[parameterIndex].getName();
+					defaultArgumentRepresentation = defaultArgumentRepresentation.replaceAll(templateArgumentID, templateArgumentValue);
+				}
+				representation.append(defaultArgumentRepresentation);
+			}
 		}
 		return representation.toString();
 	}
@@ -474,6 +494,9 @@ public class DOMCompletionProposalComputer extends ParsingBasedProposalComputer
 			final String parameterDelimiter = context.getFunctionParameterDelimiter();
 			for (int i = 0; i < params.length; ++i) {
 				IParameter param = params[i];
+				if (skipDefaultedParameter(param)) {
+					break;
+				}
 				IType paramType = param.getType();
 				if (i > 0) {
 					dispargs.append(parameterDelimiter);
@@ -487,6 +510,12 @@ public class DOMCompletionProposalComputer extends ParsingBasedProposalComputer
 					dispargs.append(' ');
 					dispargs.append(paramName);
 				}
+				if (param instanceof ICPPParameter) {
+					ICPPParameter cppParam = (ICPPParameter) param;
+					if (cppParam.hasDefaultValue() && isDisplayDefaultArguments()) {
+						dispargs.append(MessageFormat.format(DEFAULT_ARGUMENT_PATTERN, cppParam.getDefaultValue()));
+					}
+				}
 			}
 
 			if (function.takesVarArgs()) {
@@ -561,6 +590,10 @@ public class DOMCompletionProposalComputer extends ParsingBasedProposalComputer
 		proposals.add(proposal);
 	}
 
+	private boolean skipDefaultedParameter(IParameter param) {
+		return !isDisplayDefaultedParameters() && param instanceof ICPPParameter && ((ICPPParameter)param).hasDefaultValue();
+	}
+
 	private void handleVariable(IVariable variable, CContentAssistInvocationContext context,
 			int baseRelevance, List<ICompletionProposal> proposals) {
 		if (context.isContextInformationStyle()) {
@@ -755,4 +788,18 @@ public class DOMCompletionProposalComputer extends ParsingBasedProposalComputer
 		return imageDescriptor != null ?
 				CUIPlugin.getImageDescriptorRegistry().get(imageDescriptor) : null;
 	}
+
+	private static boolean isDisplayDefaultArguments() {
+		IPreferenceStore preferenceStore = getPreferenceStore();
+		return preferenceStore.getBoolean(ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_ARGUMENTS);
+	}
+
+	private static boolean isDisplayDefaultedParameters() {
+		IPreferenceStore preferenceStore = getPreferenceStore();
+		return preferenceStore.getBoolean(ContentAssistPreference.DEFAULT_ARGUMENT_DISPLAY_PARAMETERS_WITH_DEFAULT_ARGUMENT);
+	}
+
+	private static IPreferenceStore getPreferenceStore() {
+		return CUIPlugin.getDefault().getPreferenceStore();
+	}
 }