Started to Implement the Parser

MathPad/MPArrayCache.h

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+//
+//  MPArrayCache.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 31.08.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+// A wrapper around NSCache to support index-based caches. Indexes are
+// automatically adjusted to represent array-like behaviours.
+@interface MPArrayCache : NSObject {
+    @private
+    NSCache *_cache;
+}
+
+- (id)init; /* designated initializer */
+
+- (void)cacheObject:(id)object
+           forIndex:(NSUInteger)index;
+- (id)cachedObjectForIndex:(NSUInteger)index;
+
+- (void)clearCacheAtIndex:(NSUInteger)index
+        replacementLength:(NSUInteger)replacementLength;
+- (void)clearCacheInRange:(NSRange)range
+        replacementLength:(NSUInteger)replacementLength;
+
+- (void)replaceCachedObjectAtIndex:(NSUInteger)index
+                       withObjects:(NSArray *)objects;
+- (void)replaceCachedObjectsInRange:(NSRange)range
+                        withObjects:(NSArray *)objects;
+
+@end