Added MPRange and Tests

MathPad/MPRange.h

@@ -0,0 +1,39 @@
+//
+//  MPRange.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 18.04.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+@interface MPRange : NSObject <NSCopying, NSCoding>
+
+#pragma mark Creation Methods
+
+- (instancetype)init;
+- (instancetype)initWithLocation:(NSIndexPath *)location
+                          length:(NSUInteger)length;
+- (instancetype)initWithRange:(NSRange)aRange;
+
++ (instancetype)emptyRange;
++ (instancetype)rangeWithLocation:(NSIndexPath *)location
+                           length:(NSUInteger)length;
++ (instancetype)rangeWithRange:(NSRange)aRange;
+
+#pragma mark Properties
+
+@property (nonatomic, strong) NSIndexPath *location;
+@property (nonatomic) NSUInteger length;
+
+- (NSIndexPath *)maxRange;
+- (NSRange)rangeAtLastIndex;
+
+#pragma mark Working with Ranges
+
+- (BOOL)containsRange:(MPRange *)aRange;
+- (BOOL)containsLocation:(NSIndexPath *)location;
+
+- (BOOL)isEqual:(id)object;
+- (BOOL)isEqualToRange:(MPRange *)aRange;
+
+@end