[06 - Top Down Parser] Fix test "program10Assign"

ÜB-Praxis-Abstiegsparser für X-Leer/src/de/dhbw/compiler/xparser/XParser.java

@@ -152,9 +152,42 @@ public class XParser {
 	private Tree parseNumExpr() {
 		int oldPosition = in.getPosition();
 		Tree tree = new Tree(new Token(Token.EXPR));
+		Tree intConst;
 
+		if ((intConst = parseNumExpr2()) != null) {
+			tree.addLastChild(intConst);
+			return tree;
+		}
 
+		in.setPosition(oldPosition);
+		return null;
+	}
 
+	private Tree parseNumExpr2() {
+		int oldPosition = in.getPosition();
+		Tree tree = new Tree(new Token(Token.EXPR2));
+		Tree intConst;
+
+		if ((intConst = parseNumExpr3()) != null) {
+			tree.addLastChild(intConst);
+			return tree;
+		}
+
+		in.setPosition(oldPosition);
+		return null;
+	}
+
+	private Tree parseNumExpr3() {
+		int oldPosition = in.getPosition();
+		Tree tree = new Tree(new Token(Token.EXPR3));
+		Tree intConst;
+
+		if ((intConst = parseToken(Token.INTCONST)) != null) {
+			tree.addLastChild(intConst);
+			return tree;
+		}
+
+		in.setPosition(oldPosition);
 		return null;
 	}