1 files changed, 143 insertions, 0 deletions
diff --git a/org.eclipse.ui.genericeditor.examples/src/org/eclipse/ui/genericeditor/examples/dotproject/FoldingStrategy.java b/org.eclipse.ui.genericeditor.examples/src/org/eclipse/ui/genericeditor/examples/dotproject/FoldingStrategy.java
new file mode 100644
index 00000000000..42c36be84bc
--- /dev/null
+++ b/org.eclipse.ui.genericeditor.examples/src/org/eclipse/ui/genericeditor/examples/dotproject/FoldingStrategy.java
@@ -0,0 +1,143 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Red Hat Inc. 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
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Lucas Bullen (Red Hat Inc.) - initial implementation
+ *******************************************************************************/
+package org.eclipse.ui.genericeditor.examples.dotproject;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.Position;
+import org.eclipse.jface.text.reconciler.DirtyRegion;
+import org.eclipse.jface.text.reconciler.IReconcilingStrategy;
+import org.eclipse.jface.text.reconciler.IReconcilingStrategyExtension;
+import org.eclipse.jface.text.source.Annotation;
+import org.eclipse.jface.text.source.projection.ProjectionAnnotation;
+import org.eclipse.jface.text.source.projection.ProjectionViewer;
+
+public class FoldingStrategy implements IReconcilingStrategy, IReconcilingStrategyExtension {
+
+	private IDocument document;
+	private ProjectionViewer projectionViewer;
+	private Annotation[] oldAnnotations;
+
+	@Override
+	public void setDocument(IDocument document) {
+		this.document = document;
+	}
+
+	public void setProjectionViewer(ProjectionViewer projectionViewer) {
+		this.projectionViewer = projectionViewer;
+	}
+
+	@Override
+	public void reconcile(DirtyRegion dirtyRegion, IRegion subRegion) {
+		initialReconcile();
+	}
+
+	@Override
+	public void reconcile(IRegion partition) {
+		initialReconcile();
+	}
+
+	@Override
+	public void initialReconcile() {
+		List<Position> positions = getNewPositionsOfAnnotations();
+		Annotation[] annotations = new Annotation[positions.size()];
+
+		HashMap<Annotation, Position> newAnnotations = new HashMap<>();
+
+		for(int i =0;i<positions.size();i++)
+		{
+			ProjectionAnnotation annotation = new ProjectionAnnotation();
+			newAnnotations.put(annotation,positions.get(i));
+			annotations[i]=annotation;
+		}
+
+		projectionViewer.getProjectionAnnotationModel().modifyAnnotations(oldAnnotations,newAnnotations,null);
+		oldAnnotations=annotations;
+	}
+
+	private static enum SearchingFor {
+		 START_OF_TAG, START_OF_WORD, END_OF_WORD, END_OF_LINE
+	}
+
+	private List<Position> getNewPositionsOfAnnotations(){
+		List<Position> positions = new ArrayList<>();
+		Map<String, Integer> startOfAnnotation = new HashMap<>();
+		SearchingFor searchingFor = SearchingFor.START_OF_TAG;
+
+		int characters = document.getLength();
+		int currentCharIndex = 0;
+
+		int wordStartIndex = 0;
+		int sectionStartIndex = 0;
+		String word = "";
+
+		try {
+			while (currentCharIndex < characters) {
+				char currentChar = document.getChar(currentCharIndex);
+				switch (searchingFor) {
+				case START_OF_TAG:
+					if(currentChar == '<') {
+						char nextChar = document.getChar(currentCharIndex+1);
+						if(nextChar != '?') {
+							sectionStartIndex = currentCharIndex;
+							searchingFor = SearchingFor.START_OF_WORD;
+						}
+					}
+					break;
+				case START_OF_WORD:
+					if(Character.isLetter(currentChar)) {
+						wordStartIndex = currentCharIndex;
+						searchingFor = SearchingFor.END_OF_WORD;
+					}
+					break;
+				case END_OF_WORD:
+					if(!Character.isLetter(currentChar)) {
+						word = document.get(wordStartIndex, currentCharIndex - wordStartIndex);
+						if(startOfAnnotation.containsKey(word)) {
+							searchingFor = SearchingFor.END_OF_LINE;
+						}else {
+							startOfAnnotation.put(word, sectionStartIndex);
+							searchingFor = SearchingFor.START_OF_TAG;
+						}
+					}
+					break;
+				case END_OF_LINE:
+					if(currentChar == '\n') {
+						int start = startOfAnnotation.get(word);
+						if(document.getLineOfOffset(start) != document.getLineOfOffset(currentCharIndex)) {
+							positions.add(new Position(start,currentCharIndex + 1 - start));
+						}
+						startOfAnnotation.remove(word);
+						searchingFor = SearchingFor.START_OF_TAG;
+					}
+					break;
+				}
+				currentCharIndex++;
+			}
+		} catch (BadLocationException e) {
+			// skip the remainder of file due to error
+		}
+		return positions;
+	}
+
+	@Override
+	public void setProgressMonitor(IProgressMonitor monitor) {
+		// no progress monitor used
+	}
+
+}
+\ No newline at end of file