changed implimentation of split merge to match hardware. ie. if multiple bit are connected to same input just or them. Also connecting two inputs in to split side will cause as error dialogue

Author: sr14978

src/com/modsim/modules/Link.java

@@ -167,9 +167,7 @@ else if (source.canInput() && target.canOutput()) {
             // Changes are done
             Main.opStack.endCompoundOp();
 
-            // Propagate
             newLink.targ.setVal(newLink.src.getVal());
-            Main.sim.propagate(newLink.targ.owner);
 
             return newLink;
         }

src/com/modsim/modules/SplitMerge.java

@@ -8,7 +8,10 @@
 import java.util.Collections;
 import java.util.List;
 
+import javax.swing.JOptionPane;
+
 import com.modsim.modules.ports.BidirPort;
+import com.modsim.Main;
 import com.modsim.modules.parts.Port;
 import com.modsim.res.Colors;
 import com.modsim.simulator.PickableEntity;
@@ -133,12 +136,22 @@ public void propagate() {
 
         // Switch based on propagation direction
         if (portA0.wasUpdated() || portA1.wasUpdated()) {
+        	if(portA0.isConnected() && portA1.isConnected())
+        	{
+        		JOptionPane.showMessageDialog(Main.ui.pane, "Error: There must only be one connection to that size of split/merge.");
+        		Port port = portA0.wasUpdated()?portA0:portA1;
+        		synchronized (Main.sim)
+				{
+	        		Main.sim.removeLink(port.link);	        		
+        		}
+        		return;
+        	}
             b0_val.setBit(0, a0_val.getBit(0)); // A0-a0
             b1_val.setBit(0, a0_val.getBit(1)); // A1-b1
             b0_val.setBit(1, a0_val.getBit(1)); // A1-a1
 
             // Resolution of 3-state logic for merges
-            b3_val.setBit(0, a0_val.getBit(3));     // A3-d0
+            b3_val.setBit(0, a0_val.getBit(3));   // A3-d0
             b3_val.resolveBit(0, a1_val.getBit(1)); // B1-d0
 
             b2_val.setBit(0, a0_val.getBit(2));     // A2-c0
@@ -151,15 +164,15 @@ else if (   portB0.wasUpdated() || portB1.wasUpdated() ||
                     portB2.wasUpdated() || portB3.wasUpdated()) {
             a0_val.setBit(0, b0_val.getBit(0)); // a0-A0
             a0_val.setBit(2, b2_val.getBit(0)); // c0-A2
-            a0_val.setBit(3, b2_val.getBit(1)); // c1-A3
             a1_val.setBit(0, b2_val.getBit(0)); // c0-B0
 
             // Resolution of 3-state logic for merges
-            a1_val.setBit(1, b2_val.getBit(1));     // c1-B1
-            a1_val.resolveBit(1, b3_val.getBit(0)); // d0-B1
-
-            a0_val.setBit(1, b0_val.getBit(1));     // a1-A1
-            a0_val.resolveBit(1, b1_val.getBit(0)); // b0-A1
+            int val = b2_val.getBit(1) | b3_val.getBit(0);
+            a1_val.setBit(1, val);
+            a0_val.setBit(3, val);
+            
+            val = b0_val.getBit(1) | b1_val.getBit(0);
+            a0_val.setBit(1, val);
         }
 
         // Set the values

src/com/modsim/modules/ports/BidirPort.java

@@ -107,4 +107,13 @@ public boolean hasDirection() {
         return !(mode == Mode.MODE_BIDIR);
     }
 
+	public boolean isConnected() {
+		BinData data = this.getVal();
+		for(int i = 0; i<4; i++)
+		{
+			if(data.getBit(i)!=BinData.NOCON) return true;
+		}
+		return false;
+	}
+
 }

src/com/modsim/simulator/Sim.java

@@ -11,6 +11,8 @@
 import static com.modsim.modules.BaseModule.AvailableModules;
 import com.modsim.modules.parts.Port;
 import sun.awt.Mutex;
+
+import com.modsim.util.BinData;
 import com.modsim.util.CtrlPt;
 
 public class Sim implements Runnable {
@@ -197,6 +199,8 @@ public void removeLink(Link l) {
         synchronized (this) {
             links.remove(l);
         }
+        l.src.link = null;
+        l.targ.setVal(new BinData());
     }
 
     /**

src/com/modsim/tools/MakeLinkTool.java

@@ -120,7 +120,8 @@ public boolean endLink(int x, int y) {
 			Main.opStack.beginCompoundOp();
 			Link l = Link.createLink(source, targ, curve);
 			if (l != null) {
-				Main.sim.addLink(l);
+	            Main.sim.addLink(l);
+	            Main.sim.propagate(l.targ.owner);
 				Main.opStack.pushOp(new CreateOperation(l));
 			}
 			Main.opStack.endCompoundOp();

src/com/modsim/util/ModuleClipboard.java

@@ -152,7 +152,7 @@ protected void doCopy(List<BaseModule> src, List<BaseModule> destModules, List<L
                     // Store the new link
                     if (newLink != null) {
                         assert newLink.path != oldPort.link.path;
-
+                        Main.sim.propagate(newLink.targ.owner);
                         newPort.link = newLink;
                         destLinks.add(newLink);
                     }

src/com/modsim/util/XMLReader.java

@@ -188,6 +188,7 @@ else if (p.ID == targID) {
                     // Add to the simulation
                     if (l != null) {
                         Main.sim.addLink(l);
+                        Main.sim.propagate(l.targ.owner);
                     }
                     else {
                         badLinks++;