//
//  MPParsedElement.m
//  MathPad
//
//  Created by Kim Wittenburg on 05.09.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPParsedElement.h"

@implementation MPParsedElement

- (instancetype)init
{
    self = [super init];
    if (self) {
        _summands = [[NSMutableArray alloc] init];
    }
    return self;
}

- (double)standaloneValue
{
    if (self.isFactor) {
        return self.factor;
    }
    return self.prefixMultiplicator + [[self.summands valueForKeyPath:@"@sum.self"] doubleValue];
}

- (BOOL)isValidElementAtBeginning
{
    return NO;
}

- (BOOL)isValidElementInBetween
{
    return YES;
}

- (BOOL)isValidElementAtEnd
{
    return NO;
}

#pragma mark NSCopying
- (id)copyWithZone:(NSZone *)zone
{
    MPParsedElement *copy = [[MPParsedElement allocWithZone:zone] init];
    copy.isFactor = self.isFactor;
    copy.factor = self.factor;
    copy.summands = self.summands.mutableCopy;
    copy.prefixMultiplicator = self.prefixMultiplicator;
    copy.hasPrefixMultiplicator = self.hasPrefixMultiplicator;
    copy.prefixOperatorExplicit = self.prefixOperatorExplicit;
    copy.suffixMultiplicator = self.suffixMultiplicator;
    copy.hasSuffixMultiplicator = self.hasSuffixMultiplicator;
    return copy;
}

@end