make topsort

CupPlugin/src/de/tum/in/www2/cupplugin/views/CupConflictsView.java

@@ -4,6 +4,7 @@ import java.util.ArrayList;
 import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Map.Entry;
 import java.util.Set;
@@ -79,7 +80,7 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 	private boolean isVisible;
 	private List<ConflictPanel> conflictPanels;
 	private Label countConflictsLabel, connectedResolutionLabel;
-	private Button connectedResolutionAbort;
+	private Button connectedResolutionAbort, connectedResolutionApply;
 	private ScrolledComposite scrolled;
 	private Composite list;
 	
@@ -109,6 +110,8 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 			public int lowlink;
 		}
 		
+		private LinkedList<Pair<terminal,Precedence.Type>> result;
+		
 		public boolean isResolvedInFavorOfShift(ShiftReduceDetails srd){
 			if(!srd.reduce.equals(srd.shift))
 				//TODO: Check if precedence set for terminal at all
@@ -174,7 +177,7 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 			// Insert edge
 			edges.get(lower).add(higher);
 			
-			if(!isAcylic()){
+			if(!isAcyclic()){
 				throw new IllegalStateException("Horrible  things lurk here");
 			}
 			
@@ -183,7 +186,7 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 			}
 		}
 		
-		private boolean isAcylic(){
+		private boolean isAcyclic(){
 			tarjanIndex = 0;
 			tarjanNodeInfos = new HashMap<>();
 			tarjanStack = new Stack<>();
@@ -241,7 +244,72 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 		}
 		
 		//TODO: topological sort of all precedences (probably reverse)
+		private void topSort(){
+			result = new LinkedList<>();
+			tarjanNodeInfos = new HashMap<>();
+			tarjanStack = new Stack<>();
+			
+			for(terminal t : precs.keySet()){
+				TarjanNodeInfo tni = new TarjanNodeInfo();
+				tni.onStack = false;
+				tni.index = -1;
+				tni.lowlink = -1;
+				tarjanNodeInfos.put(t, tni);
+			}
+			
+			for(Entry<terminal, TarjanNodeInfo> e : tarjanNodeInfos.entrySet()){
+
+				if(e.getValue().index == -1){
+					topSortVisit(e.getKey());
+				}
+			}
+		}
+		
+		private void topSortVisit(terminal t){
+			if(tarjanNodeInfos.get(t).onStack){
+				throw new IllegalStateException("Expected result to be acyclic.");
+			}
+			
+			if(tarjanNodeInfos.get(t).index == -1){
+				tarjanNodeInfos.get(t).onStack = true;
+				
+				for(terminal succ : edges.get(t)){
+					topSortVisit(succ);
+				}
+				
+				tarjanNodeInfos.get(t).index = 1;
+				tarjanNodeInfos.get(t).onStack = false;
+				result.addFirst(new Pair<terminal,Precedence.Type>(t,precs.get(t)));
+			}
+		}
 		
+		public String precsToInsert(){
+			if(!isAcyclic()){
+				throw new IllegalStateException("Expected result to be acyclic.");
+			}
+			
+			topSort();
+			
+			StringBuilder sb = new StringBuilder(); 
+			
+			boolean first = true;
+			for(Pair<terminal,Precedence.Type> p : result){
+				if(first){
+					first = false;
+				}
+				else {
+					sb.append("\n");
+				}
+				
+				sb.append("precedence ");
+				sb.append(p.getSecond().toString().toLowerCase());
+				sb.append(" ");
+				sb.append(p.getFirst().name());
+				sb.append(";	// Inserted by Eclipse plugin");
+			}
+			
+			return sb.toString();
+		}
 		
 		private boolean hasPrecedence(terminal t,terminal over){
 			if(!precs.containsKey(t) && !precs.containsKey(over)){
@@ -927,6 +995,21 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 			
 		});
 		
+		this.connectedResolutionApply = new Button(list,SWT.PUSH);
+		this.connectedResolutionApply.setVisible(false);
+		this.connectedResolutionApply.setText("Apply");
+		this.connectedResolutionApply.addSelectionListener(new SelectionListener() {
+
+			@Override
+			public void widgetSelected(SelectionEvent e) {
+				applyConnectedResolution();
+			}
+
+			@Override
+			public void widgetDefaultSelected(SelectionEvent e) {	
+			}
+		});	
+		
 		refreshScrolledLayout();
 	}
 
@@ -1032,7 +1115,6 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 		}
 	}
 
-	
 	private void beginConnectedResolution(){
 		Shell shell = new Shell(Display.getCurrent());
 		MessageBox box = new MessageBox(shell,SWT.ICON_WARNING | SWT.OK);
@@ -1044,6 +1126,7 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 		currentPrecs = new PrecedenceToInsert();
 		this.connectedResolutionLabel.setText("Currently resolving a set of conflicts that are connected.");
 		this.connectedResolutionAbort.setVisible(true);
+		this.connectedResolutionApply.setVisible(true);
 		refreshScrolledLayout();
 	}
 	
@@ -1051,6 +1134,7 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 		currentPrecs = new PrecedenceToInsert();
 		this.connectedResolutionLabel.setText("");
 		this.connectedResolutionAbort.setVisible(false);
+		this.connectedResolutionApply.setVisible(false);
 		
 		for(ConflictPanel c : conflictPanels){
 			c.connectedEditAborted();
@@ -1058,6 +1142,34 @@ public class CupConflictsView extends FailableView implements ICupEditorPageVisi
 		
 		refreshScrolledLayout();
 	}
+
+	private void applyConnectedResolution(){
+		try {
+			IDocument document = editor.getDocument();
+			ParserResult r = Model.getInstanceForDocument(document).getAstModel();
+
+			String toInsert = currentPrecs.precsToInsert();
+
+			int positionForPrec = 0;
+			if (r.precedences.size() == 0) {
+				// Precedences are located immediately after the last symbol
+				// decl
+				positionForPrec = r.symbols.get(r.symbols.size() - 1).getEnd().getOffsetFromStart();
+				toInsert = "\n\n//Precedences added by Eclipse plugin\n" + toInsert;
+			} else {
+				positionForPrec = r.precedences.get(r.precedences.size() - 1).getRange().getBegin()
+						.getOffsetFromStart();
+				toInsert = toInsert + "\n";
+			}
+
+			document.replace(positionForPrec, 0, toInsert);
+			
+			abortConnectedResolution();
+		} catch (BadLocationException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+	}
 	
 	private void insertPrecedence(terminal terminal,Precedence.Type assoc){
 		try {