Added the MPExpressionTree Classes

MathPad/MPFactor.h

@@ -0,0 +1,22 @@
+//
+//  MPFactor.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 09.10.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import "MPExpressionTreeElement.h"
+#import "MPValueGroup.h"
+#import "MPOperatorChain.h"
+
+@interface MPFactor : NSObject <MPExpressionTreeElement>
+
+@property (nonatomic) BOOL hasMultiplicationSymbol;
+@property (nonatomic, strong) MPOperatorChain *operatorChain;
+@property (nonatomic, strong) id<MPValue> value;
+
+- (NSRange)multiplicationSymbolRange;
+
+@end