//
//  MPTerm.h
//  MathPad
//
//  Created by Kim Wittenburg on 11.11.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#define ReturnIfNil(test, value) if (test == nil) return value
#define ReturnNilIfNil(test) if (test == nil) return nil


@class MPTerm;


@interface MPTerm : NSObject

- (NSDecimalNumber *)evaluate:(NSError *__autoreleasing *)error;
- (NSDecimalNumber *)doEvaluation:(NSError *__autoreleasing *)error;

- (BOOL)defineVariable:(NSString *)variableName
                 value:(NSDecimalNumber *)value
                 error:(NSError *__autoreleasing *)error;
- (NSDecimalNumber *)valueForVariable:(NSString *)variableName
                                error:(NSError *__autoreleasing *)error;
- (void)undefineVariable:(NSString *)variableName; // Should rarely be needed, defined variables are automatically undefined at the end of evaluation.

@end