Started to Implement the Parser

MathPad/MPExpressionEvaluator.h

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+//
+//  MPExpressionEvaluator.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 31.08.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import "MPExpression.h"
+
+@class MPExpressionEvaluator, MPExpression, MPParsedElement;
+
+@interface MPExpressionEvaluator : NSObject
+
+- (instancetype)initWithExpression:(MPExpression *)expression;
+
+@property (readonly, nonatomic, strong) MPExpression *expression;
+
+#pragma mark Lexing
+- (MPParsedElement *)structuredRepresentationOfElementAtIndex:(NSUInteger)index;
+
+#pragma mark Evaluating Expressions
+@property (readonly, nonatomic, strong) NSDictionary *variableBindings;
+
+- (void)bindValue:(double)value toVariableName:(NSString *)name;
+
+- (double)evaluateWithError:(NSError *__autoreleasing *)error;
+
+@end