//
//  MPExpressionTree.h
//  MathPad
//
//  Created by Kim Wittenburg on 09.10.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "MPSummand.h"
#import "MPExpressionTreeElement.h"

@interface MPExpressionTree : NSObject <MPExpressionTreeElement>

@property (nonatomic, copy) NSString *definedVariable;

- (NSArray *)summands;
- (void)appendSummand:(MPSummand *)summand;
- (void)insertSummand:(MPSummand *)summand
              atIndex:(NSUInteger)index;
- (void)removeSummand:(MPSummand *)summand;
- (void)removeSummandAtIndex:(NSUInteger)index;
- (MPSummand *)summandAtIndex:(NSUInteger)index;

- (BOOL)validateExpectingVariableDefinition:(BOOL)flag
                                      error:(MPParseError *__autoreleasing *)error;

@end