43 lines
946 B
Objective-C
43 lines
946 B
Objective-C
//
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// MPSumTerm.m
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// MathPad
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//
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// Created by Kim Wittenburg on 14.11.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPSumTerm.h"
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#import "MPParsedExpression.h"
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#import "MPProductTerm.h"
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#import "MPToken.h"
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@implementation MPSumTerm
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- (instancetype)initWithSummands:(NSArray *)summands
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{
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self = [super init];
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if (self) {
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NSAssert(summands != nil, @"summands must not be nil.");
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NSAssert(summands.count > 0, @"summands must not be empty.");
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_summands = summands;
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}
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return self;
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}
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- (NSDecimalNumber *)doEvaluation:(NSError *__autoreleasing *)error
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{
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NSDecimalNumber *value = [NSDecimalNumber zero];
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for (MPTerm *summand in self.summands) {
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NSDecimalNumber *currentValue = [summand evaluate:error];
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if (!currentValue) {
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return nil;
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}
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value = [value decimalNumberByAdding:currentValue];
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}
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return value;
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}
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@end
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