//
//  MPEvaluationContext.h
//  MathPad
//
//  Created by Kim Wittenburg on 12.09.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface MPEvaluationContext : NSObject

+ (MPEvaluationContext *)sharedContext;

- (void)push;
- (void)pop;

- (void)defineVariable:(NSString *)variable withValue:(NSDecimalNumber *)value;
- (void)undefineVariable:(NSString *)variable;
- (BOOL)isVariableDefined:(NSString *)variable;

- (NSDecimalNumber *)valueForVariable:(NSString *)variable;

@end