Bugfix in parser (can cause LTL model checking to hang).

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@1112 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/parser/ast/ExpressionProb.java

@@ -54,7 +54,7 @@ public class ExpressionProb extends Expression
 
 	public void setRelOp(String r)
 	{
-		relOp =r;
+		relOp = r;
 	}
 
 	public void setProb(Expression p)
@@ -138,10 +138,14 @@ public class ExpressionProb extends Expression
 	  */
 	public String getResultName()
 	{
-		if (prob != null) return "Result";
-		else if (relOp.equals("min=")) return "Minimum probability";
-		else if (relOp.equals("max=")) return "Maximum probability";
-		else return "Probability";
+		if (prob != null)
+			return "Result";
+		else if (relOp.equals("min="))
+			return "Minimum probability";
+		else if (relOp.equals("max="))
+			return "Maximum probability";
+		else
+			return "Probability";
 	}
 
 	// Methods required for ASTElement:
@@ -162,9 +166,10 @@ public class ExpressionProb extends Expression
 		String s = "";
 
 		s += "P" + relOp;
-		s += (prob==null) ? "?" : prob.toString();
+		s += (prob == null) ? "?" : prob.toString();
 		s += " [ " + expression;
-		if (filter != null) s += " "+filter;
+		if (filter != null)
+			s += " " + filter;
 		s += " ]";
 
 		return s;
@@ -175,8 +180,8 @@ public class ExpressionProb extends Expression
 	 */
 	public Expression deepCopy()
 	{
-		ExpressionProb expr = new ExpressionProb(expression.deepCopy(), relOp, prob.deepCopy());
-		expr.setFilter((Filter)filter.deepCopy());
+		ExpressionProb expr = new ExpressionProb(expression.deepCopy(), relOp, prob == null ? null : prob.deepCopy());
+		if (filter != null) expr.setFilter((Filter) filter.deepCopy());
 		expr.setType(type);
 		expr.setPosition(this);
 		return expr;

prism/src/parser/ast/ExpressionReward.java

@@ -202,10 +202,10 @@ public class ExpressionReward extends Expression
 	 */
 	public Expression deepCopy()
 	{
-		ExpressionReward expr = new ExpressionReward(expression.deepCopy(), relOp, reward.deepCopy());
+		ExpressionReward expr = new ExpressionReward(expression.deepCopy(), relOp, reward == null ? null : reward.deepCopy());
 		if (rewardStructIndex != null && rewardStructIndex instanceof Expression) expr.setRewardStructIndex(((Expression)rewardStructIndex).deepCopy());
 		else expr.setRewardStructIndex(rewardStructIndex);
-		expr.setFilter((Filter)filter.deepCopy());
+		if (filter != null) expr.setFilter((Filter) filter.deepCopy());
 		expr.setType(type);
 		expr.setPosition(this);
 		return expr;

prism/src/parser/ast/ExpressionSS.java

@@ -172,8 +172,8 @@ public class ExpressionSS extends Expression
 	 */
 	public Expression deepCopy()
 	{
-		ExpressionSS expr = new ExpressionSS(expression.deepCopy(), relOp, prob.deepCopy());
-		expr.setFilter((Filter)filter.deepCopy());
+		ExpressionSS expr = new ExpressionSS(expression.deepCopy(), relOp, prob == null ? null : prob.deepCopy());
+		if (filter != null) expr.setFilter((Filter) filter.deepCopy());
 		expr.setType(type);
 		expr.setPosition(this);
 		return expr;