Internal Redesign:

- Combined MPExpression and MPMutableExpression
- Abstracted children of MPExpression into MPExpressionElement protocol
- Abstracted most of MPExpressionLayout and MPFunctionLayout into common superclass MPLayout

MathPad/NSIndexPath+MPAdditions.h

@@ -0,0 +1,30 @@
+//
+//  NSIndexPath+MPRemoveFirstIndex.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 23.04.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+@import Foundation;
+
+@interface NSIndexPath (MPAdditions)
+
+/*!
+ @method indexPathByRemovingFirstIndex
+ @brief Provides an index path with the indexes in the receiving index path, excluding the first one.
+ @discussion Returns an empty NSIndexPath instance if the receiving index path’s length is 1 or less.
+ @return A new index path with the receiving index path’s indexes, excluding the first one.
+ */
+- (NSIndexPath *)indexPathByRemovingFirstIndex;
+
+/*!
+ @method indexPathByPreceedingIndex:
+ @brief Provides an index path with the given index followed by the indexes of the receiver.
+ @discussion If the receiver does not contain any indexes the given index is the only index contained in the returned index path.
+ @param index The index new index preceeding all others
+ @return A new index path with all the receiver's indexes preceeded by @c index.
+ */
+- (NSIndexPath *)indexPathByPreceedingIndex:(NSUInteger)index;
+
+@end