From a8a21b50d7c5b69a7da09175897b57282be1e51f Mon Sep 17 00:00:00 2001
From: danthe1st <daniel@wwwmaster.at>
Date: Tue, 3 Dec 2024 00:09:35 +0100
Subject: [PATCH] add custom folding regions

---
 org.eclipse.jdt.ui/META-INF/MANIFEST.MF       |  2 +-
 org.eclipse.jdt.ui/pom.xml                    |  2 +-
 .../DefaultJavaFoldingPreferenceBlock.java    | 81 +++++++++++++-----
 .../ui/text/folding/FoldingMessages.java      |  5 ++
 .../text/folding/FoldingMessages.properties   |  7 +-
 .../eclipse/jdt/ui/PreferenceConstants.java   | 33 ++++++++
 .../DefaultJavaFoldingStructureProvider.java  | 82 ++++++++++++++++++-
 7 files changed, 186 insertions(+), 26 deletions(-)

diff --git a/org.eclipse.jdt.ui/META-INF/MANIFEST.MF b/org.eclipse.jdt.ui/META-INF/MANIFEST.MF
index d1e23212930..e305e62874b 100644
--- a/org.eclipse.jdt.ui/META-INF/MANIFEST.MF
+++ b/org.eclipse.jdt.ui/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@ Automatic-Module-Name: org.eclipse.jdt.ui
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.jdt.ui; singleton:=true
-Bundle-Version: 3.33.300.qualifier
+Bundle-Version: 3.34.0.qualifier
 Bundle-Activator: org.eclipse.jdt.internal.ui.JavaPlugin
 Bundle-ActivationPolicy: lazy
 Bundle-Vendor: %providerName
diff --git a/org.eclipse.jdt.ui/pom.xml b/org.eclipse.jdt.ui/pom.xml
index 3818bc298e7..bd14d5f10c9 100644
--- a/org.eclipse.jdt.ui/pom.xml
+++ b/org.eclipse.jdt.ui/pom.xml
@@ -18,7 +18,7 @@
   </parent>
   <groupId>org.eclipse.jdt</groupId>
   <artifactId>org.eclipse.jdt.ui</artifactId>
-  <version>3.33.300-SNAPSHOT</version>
+  <version>3.34.0-SNAPSHOT</version>
   <packaging>eclipse-plugin</packaging>
 
 	<build>
diff --git a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/DefaultJavaFoldingPreferenceBlock.java b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/DefaultJavaFoldingPreferenceBlock.java
index b8f64cb15ab..af3c831f686 100644
--- a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/DefaultJavaFoldingPreferenceBlock.java
+++ b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/DefaultJavaFoldingPreferenceBlock.java
@@ -15,10 +15,10 @@
 
 import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.Map;
 
 import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.ModifyListener;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.layout.GridData;
@@ -26,7 +26,9 @@
 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.swt.widgets.Label;
+import org.eclipse.swt.widgets.Text;
 
 import org.eclipse.jface.preference.IPreferenceStore;
 
@@ -59,6 +61,12 @@ public void widgetSelected(SelectionEvent e) {
 			fOverlayStore.setValue(fCheckBoxes.get(button), button.getSelection());
 		}
 	};
+	private Map<Text, String> fStringInputs= new HashMap<>();
+	private ModifyListener fModifyListener = e -> {
+		Text text = (Text)e.widget;
+		fOverlayStore.setValue(fStringInputs.get(text), text.getText());
+	};
+
 
 
 	public DefaultJavaFoldingPreferenceBlock() {
@@ -75,6 +83,9 @@ private OverlayKey[] createKeys() {
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, PreferenceConstants.EDITOR_FOLDING_METHODS));
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, PreferenceConstants.EDITOR_FOLDING_IMPORTS));
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, PreferenceConstants.EDITOR_FOLDING_HEADERS));
+		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGIONS));
+		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGION_START));
+		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGION_END));
 
 		return overlayKeys.toArray(new OverlayKey[overlayKeys.size()]);
 	}
@@ -87,22 +98,36 @@ public Control createControl(Composite composite) {
 		fOverlayStore.load();
 		fOverlayStore.start();
 
-		Composite inner= new Composite(composite, SWT.NONE);
 		GridLayout layout= new GridLayout(1, true);
 		layout.verticalSpacing= 3;
 		layout.marginWidth= 0;
-		inner.setLayout(layout);
-
-		Label label= new Label(inner, SWT.LEFT);
-		label.setText(FoldingMessages.DefaultJavaFoldingPreferenceBlock_title);
-
-		addCheckBox(inner, FoldingMessages.DefaultJavaFoldingPreferenceBlock_comments, PreferenceConstants.EDITOR_FOLDING_JAVADOC, 0);
-		addCheckBox(inner, FoldingMessages.DefaultJavaFoldingPreferenceBlock_headers, PreferenceConstants.EDITOR_FOLDING_HEADERS, 0);
-		addCheckBox(inner, FoldingMessages.DefaultJavaFoldingPreferenceBlock_innerTypes, PreferenceConstants.EDITOR_FOLDING_INNERTYPES, 0);
-		addCheckBox(inner, FoldingMessages.DefaultJavaFoldingPreferenceBlock_methods, PreferenceConstants.EDITOR_FOLDING_METHODS, 0);
-		addCheckBox(inner, FoldingMessages.DefaultJavaFoldingPreferenceBlock_imports, PreferenceConstants.EDITOR_FOLDING_IMPORTS, 0);
-
-		return inner;
+		composite.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false));
+
+		Composite outer= new Composite(composite, SWT.NONE);
+		outer.setLayout(layout);
+		outer.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
+
+		Group initialFoldingGroup= new Group(outer, SWT.NONE);
+		initialFoldingGroup.setLayout(layout);
+		initialFoldingGroup.setText(FoldingMessages.DefaultJavaFoldingPreferenceBlock_title);
+		initialFoldingGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
+
+		addCheckBox(initialFoldingGroup, FoldingMessages.DefaultJavaFoldingPreferenceBlock_comments, PreferenceConstants.EDITOR_FOLDING_JAVADOC, 0);
+		addCheckBox(initialFoldingGroup, FoldingMessages.DefaultJavaFoldingPreferenceBlock_headers, PreferenceConstants.EDITOR_FOLDING_HEADERS, 0);
+		addCheckBox(initialFoldingGroup, FoldingMessages.DefaultJavaFoldingPreferenceBlock_innerTypes, PreferenceConstants.EDITOR_FOLDING_INNERTYPES, 0);
+		addCheckBox(initialFoldingGroup, FoldingMessages.DefaultJavaFoldingPreferenceBlock_methods, PreferenceConstants.EDITOR_FOLDING_METHODS, 0);
+		addCheckBox(initialFoldingGroup, FoldingMessages.DefaultJavaFoldingPreferenceBlock_imports, PreferenceConstants.EDITOR_FOLDING_IMPORTS, 0);
+		addCheckBox(initialFoldingGroup, FoldingMessages.DefaultJavaFoldingPreferenceBlock_customRegions, PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGIONS, 0);
+
+		Group customRegionGroup= new Group(outer, SWT.NONE);
+		customRegionGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
+
+		GridLayout customRegionLayout= new GridLayout(2, false);
+		customRegionGroup.setLayout(customRegionLayout);
+		customRegionGroup.setText(FoldingMessages.DefaultJavaFoldingPreferenceBlock_custom_region_title);
+		addStringInput(customRegionGroup, FoldingMessages.DefaultJavaFoldingPreferenceBlock_CustomRegionStart, PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGION_START);
+		addStringInput(customRegionGroup, FoldingMessages.DefaultJavaFoldingPreferenceBlock_CustomRegionEnd, PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGION_END);
+		return outer;
 	}
 
 	private Button addCheckBox(Composite parent, String label, String key, int indentation) {
@@ -121,13 +146,29 @@ private Button addCheckBox(Composite parent, String label, String key, int inden
 		return checkBox;
 	}
 
+	private void addStringInput(Composite parent, String label, String key) {
+		Label labelElement = new Label(parent, SWT.LEFT);
+		labelElement.setText(label);
+		GridData labelGridData= new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
+		labelGridData.horizontalSpan= 1;
+		labelGridData.grabExcessVerticalSpace= false;
+		labelElement.setLayoutData(labelGridData);
+
+		Text textInput = new Text(parent, SWT.SINGLE | SWT.BORDER);
+		textInput.setText(label);
+		textInput.addModifyListener(fModifyListener);
+
+		GridData textGridData= new GridData(SWT.FILL, SWT.BEGINNING, true, false);
+		textGridData.horizontalSpan= 1;
+		textGridData.grabExcessVerticalSpace= true;
+		textInput.setLayoutData(textGridData);
+
+		fStringInputs.put(textInput, key);
+	}
+
 	private void initializeFields() {
-		Iterator<Button> it= fCheckBoxes.keySet().iterator();
-		while (it.hasNext()) {
-			Button b= it.next();
-			String key= fCheckBoxes.get(b);
-			b.setSelection(fOverlayStore.getBoolean(key));
-		}
+		fCheckBoxes.forEach((b, key) -> b.setSelection(fOverlayStore.getBoolean(key)));
+		fStringInputs.forEach((text, key) -> text.setText(fOverlayStore.getString(key)));
 	}
 
 	/*
diff --git a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/FoldingMessages.java b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/FoldingMessages.java
index 92b4ea1637c..8728dba3743 100644
--- a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/FoldingMessages.java
+++ b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/FoldingMessages.java
@@ -32,6 +32,11 @@ private FoldingMessages() {
 	public static String DefaultJavaFoldingPreferenceBlock_methods;
 	public static String DefaultJavaFoldingPreferenceBlock_imports;
 	public static String DefaultJavaFoldingPreferenceBlock_headers;
+	public static String DefaultJavaFoldingPreferenceBlock_customRegions;
+
+	public static String DefaultJavaFoldingPreferenceBlock_custom_region_title;
+	public static String DefaultJavaFoldingPreferenceBlock_CustomRegionStart;
+	public static String DefaultJavaFoldingPreferenceBlock_CustomRegionEnd;
 	public static String EmptyJavaFoldingPreferenceBlock_emptyCaption;
 	public static String JavaFoldingStructureProviderRegistry_warning_providerNotFound_resetToDefault;
 
diff --git a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/FoldingMessages.properties b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/FoldingMessages.properties
index 3a91f5e6f6f..db0a9a2cdef 100644
--- a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/FoldingMessages.properties
+++ b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/FoldingMessages.properties
@@ -13,12 +13,17 @@
 ###############################################################################
 
 
-DefaultJavaFoldingPreferenceBlock_title= Initially fold these elements:
+DefaultJavaFoldingPreferenceBlock_title= Initially fold these elements
 DefaultJavaFoldingPreferenceBlock_comments= &Comments
 DefaultJavaFoldingPreferenceBlock_innerTypes= Inner &types
 DefaultJavaFoldingPreferenceBlock_methods= &Members
 DefaultJavaFoldingPreferenceBlock_imports= &Imports
 DefaultJavaFoldingPreferenceBlock_headers= &Header Comments
+DefaultJavaFoldingPreferenceBlock_customRegions= Custom folding regions
+
+DefaultJavaFoldingPreferenceBlock_custom_region_title= Custom folding regions
+DefaultJavaFoldingPreferenceBlock_CustomRegionStart= Text marking start of custom folding regions
+DefaultJavaFoldingPreferenceBlock_CustomRegionEnd= Text marking end of custom folding regions
 
 JavaFoldingStructureProviderRegistry_warning_providerNotFound_resetToDefault= The ''{0}'' folding provider could not be found. Resetting to the default folding provider.
 
diff --git a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java
index 5b2fd619e15..1734a78ca50 100644
--- a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java
+++ b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java
@@ -3471,6 +3471,36 @@ private PreferenceConstants() {
 	 */
 	public static final String EDITOR_FOLDING_HEADERS= "editor_folding_default_headers"; //$NON-NLS-1$
 
+	/**
+	 * A named preference that stores the value for custom region folding for the default folding provider.
+	 * <p>
+	 * Value is of type <code>Boolean</code>.
+	 * </p>
+	 *
+	 * @since 3.34
+	 */
+	public static final String EDITOR_FOLDING_CUSTOM_REGIONS= "editor_folding_custom_regions"; //$NON-NLS-1$
+
+	/**
+	 * A named preference that stores the value for the start indicator of custom folding regions for the default folding provider.
+	 * <p>
+	 * Value is of type <code>String</code>.
+	 * </p>
+	 *
+	 * @since 3.34
+	 */
+	public static final String EDITOR_FOLDING_CUSTOM_REGION_START= "editor_folding_custom_region_start"; //$NON-NLS-1$
+
+	/**
+	 * A named preference that stores the value for the end indicator of custom folding regions for the default folding provider.
+	 * <p>
+	 * Value is of type <code>String</code>.
+	 * </p>
+	 *
+	 * @since 3.34
+	 */
+	public static final String EDITOR_FOLDING_CUSTOM_REGION_END= "editor_folding_custom_region_end"; //$NON-NLS-1$
+
 	/**
 	 * A named preference that holds the methods or types whose methods are by default expanded with
 	 * constructors in the Call Hierarchy.
@@ -4288,6 +4318,9 @@ public static void initializeDefaultValues(IPreferenceStore store) {
 		store.setDefault(PreferenceConstants.EDITOR_FOLDING_METHODS, false);
 		store.setDefault(PreferenceConstants.EDITOR_FOLDING_IMPORTS, true);
 		store.setDefault(PreferenceConstants.EDITOR_FOLDING_HEADERS, true);
+		store.setDefault(PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGIONS, false);
+		store.setDefault(PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGION_START, "#region"); //$NON-NLS-1$
+		store.setDefault(PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGION_END, "#endregion"); //$NON-NLS-1$
 
 		// properties file editor
 		store.setDefault(PreferenceConstants.PROPERTIES_FILE_COLORING_KEY_BOLD, false);
diff --git a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/text/folding/DefaultJavaFoldingStructureProvider.java b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/text/folding/DefaultJavaFoldingStructureProvider.java
index e212f37c39a..0011e9accc9 100755
--- a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/text/folding/DefaultJavaFoldingStructureProvider.java
+++ b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/text/folding/DefaultJavaFoldingStructureProvider.java
@@ -13,11 +13,13 @@
  *******************************************************************************/
 package org.eclipse.jdt.ui.text.folding;
 
+import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
+import java.util.Deque;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -107,6 +109,9 @@ protected final class FoldingStructureComputationContext {
 		private IScanner fDefaultScanner; // this one may or not be the shared DefaultJavaFoldingStructureProvider.fSharedScanner
 		private IScanner fScannerForProject;
 
+		private Deque<Integer> fOpenCustomRegionStartPositions = new ArrayDeque<>();
+		private Set<Region> fCurrentCustomRegions = new HashSet<>();
+
 		private FoldingStructureComputationContext(IDocument document, ProjectionAnnotationModel model, boolean allowCollapsing, IScanner scanner) {
 			Assert.isNotNull(document);
 			Assert.isNotNull(model);
@@ -245,6 +250,17 @@ public boolean collapseJavadoc() {
 		public boolean collapseMembers() {
 			return fAllowCollapsing && fCollapseMembers;
 		}
+
+		/**
+		 * Returns <code>true</code> if custom regions should be collapsed.
+		 *
+		 * @return <code>true</code> if custom regions should be collapsed
+		 * @since 3.34
+		 */
+		public boolean collapseCustomRegions() {
+			return fAllowCollapsing && fCollapseCustomRegions;
+		}
+
 	}
 
 	/**
@@ -733,6 +749,11 @@ public void projectionDisabled() {
 	private boolean fCollapseInnerTypes= true;
 	private boolean fCollapseMembers= false;
 	private boolean fCollapseHeaderComments= true;
+	private boolean fCollapseCustomRegions= false;
+
+	private boolean fCustomFoldingRegionsEnabled= true;
+	private String fCustomFoldingRegionBegin="#region"; //$NON-NLS-1$
+	private String fCustomFoldingRegionEnd="#endregion"; //$NON-NLS-1$
 
 	/* filters */
 	/** Member filter, matches nested members (but not top-level types). */
@@ -906,6 +927,11 @@ private void initializePreferences() {
 		fCollapseJavadoc= store.getBoolean(PreferenceConstants.EDITOR_FOLDING_JAVADOC);
 		fCollapseMembers= store.getBoolean(PreferenceConstants.EDITOR_FOLDING_METHODS);
 		fCollapseHeaderComments= store.getBoolean(PreferenceConstants.EDITOR_FOLDING_HEADERS);
+		fCollapseCustomRegions= store.getBoolean(PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGIONS);
+		fCustomFoldingRegionBegin=store.getString(PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGION_START);
+		fCustomFoldingRegionEnd=store.getString(PreferenceConstants.EDITOR_FOLDING_CUSTOM_REGION_END);
+		fCustomFoldingRegionsEnabled = !fCustomFoldingRegionBegin.isEmpty() && !fCustomFoldingRegionEnd.isEmpty() &&
+				!fCustomFoldingRegionBegin.contains(fCustomFoldingRegionEnd) && !fCustomFoldingRegionEnd.contains(fCustomFoldingRegionBegin);
 	}
 
 	private void update(FoldingStructureComputationContext ctx) {
@@ -1060,13 +1086,16 @@ protected void computeFoldingStructure(IJavaElement element, FoldingStructureCom
 		if (regions.length > 0) {
 			// comments
 			for (int i= 0; i < regions.length - 1; i++) {
-				IRegion normalized= alignRegion(regions[i], ctx);
+				IRegion region= regions[i];
+				IRegion normalized= alignRegion(region, ctx);
 				if (normalized != null) {
 					Position position= createCommentPosition(normalized);
 					if (position != null) {
 						boolean commentCollapse;
 						if (i == 0 && (regions.length > 2 || ctx.hasHeaderComment()) && element == ctx.getFirstType()) {
 							commentCollapse= ctx.collapseHeaderComments();
+						} else if(ctx.fCurrentCustomRegions.contains(region)) {
+							commentCollapse= ctx.collapseCustomRegions();
 						} else {
 							commentCollapse= ctx.collapseJavadoc();
 						}
@@ -1151,6 +1180,7 @@ protected final IRegion[] computeProjectionRanges(ISourceReference reference, Fo
 				scanner.resetTo(shift, shift + range.getLength());
 
 				int start= shift;
+
 				while (true) {
 
 					int token= scanner.getNextToken();
@@ -1162,10 +1192,14 @@ protected final IRegion[] computeProjectionRanges(ISourceReference reference, Fo
 						case ITerminalSymbols.TokenNameCOMMENT_BLOCK: {
 							int end= scanner.getCurrentTokenEndPosition() + 1;
 							regions.add(new Region(start, end - start));
-							continue;
 						}
-						case ITerminalSymbols.TokenNameCOMMENT_LINE:
+						//$FALL-THROUGH$
+						case ITerminalSymbols.TokenNameCOMMENT_LINE: {
+							if (fCustomFoldingRegionsEnabled) {
+								checkCustomFolding(ctx, regions, scanner, start, regions.size());
+							}
 							continue;
+						}
 					}
 
 					break;
@@ -1173,6 +1207,30 @@ protected final IRegion[] computeProjectionRanges(ISourceReference reference, Fo
 
 				regions.add(new Region(start, shift + range.getLength() - start));
 
+				if (fCustomFoldingRegionsEnabled) {
+					if (reference instanceof IJavaElement javaElement && javaElement.getParent() != null && javaElement.getParent() instanceof IParent parent) {
+						IJavaElement[] siblings= parent.getChildren();
+						if (javaElement == siblings[siblings.length-1] && parent instanceof ISourceReference parentSourceReference) {
+							int regionStart = range.getOffset() + range.getLength();
+							ISourceRange parentRange= parentSourceReference.getSourceRange();
+							int regionEnd = parentRange.getOffset() + parentRange.getLength();
+							scanner.resetTo(regionStart, regionEnd);
+							for(int token = scanner.getNextToken(); token != ITerminalSymbols.TokenNameEOF; token=scanner.getNextToken()) {
+								if(isCommentToken(token)) {
+									checkCustomFolding(ctx, regions, scanner, scanner.getCurrentTokenStartPosition(), regions.size() - 1);
+								}
+							}
+						}
+					}
+					if (reference instanceof IParent parent && !parent.hasChildren()) {
+						for(int token = scanner.getNextToken(); token != ITerminalSymbols.TokenNameEOF; token=scanner.getNextToken()) {
+							if(isCommentToken(token)) {
+								checkCustomFolding(ctx, regions, scanner, scanner.getCurrentTokenStartPosition(), regions.size() - 1);
+							}
+						}
+					}
+				}
+
 				IRegion[] result= new IRegion[regions.size()];
 				regions.toArray(result);
 				return result;
@@ -1182,6 +1240,24 @@ protected final IRegion[] computeProjectionRanges(ISourceReference reference, Fo
 		return new IRegion[0];
 	}
 
+	private boolean isCommentToken(int token) {
+		return token == ITerminalSymbols.TokenNameCOMMENT_BLOCK || token == ITerminalSymbols.TokenNameCOMMENT_JAVADOC || token == ITerminalSymbols.TokenNameCOMMENT_MARKDOWN || token == ITerminalSymbols.TokenNameCOMMENT_LINE;
+	}
+
+	private void checkCustomFolding(FoldingStructureComputationContext ctx, List<IRegion> regions, IScanner scanner, int start, int regionArrayIndex) {
+		String currentTokenSource= new String(scanner.getCurrentTokenSource());
+		if (currentTokenSource.contains(fCustomFoldingRegionBegin)) {
+			ctx.fOpenCustomRegionStartPositions.add(start);
+		}
+		if (currentTokenSource.contains(fCustomFoldingRegionEnd) && !ctx.fOpenCustomRegionStartPositions.isEmpty()) {
+				int end= scanner.getCurrentTokenEndPosition() + 1;
+				Integer regionStart= ctx.fOpenCustomRegionStartPositions.removeLast();
+				Region region= new Region(regionStart, end - regionStart);
+				regions.add(regionArrayIndex, region);
+				ctx.fCurrentCustomRegions.add(region);
+		}
+	}
+
 	private IRegion computeHeaderComment(FoldingStructureComputationContext ctx) throws JavaModelException {
 		// search at most up to the first type
 		ISourceRange range= ctx.getFirstType().getSourceRange();