41 lines
1.2 KiB
Objective-C
41 lines
1.2 KiB
Objective-C
//
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// MPSumFunctionTerm.m
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// MathPad
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//
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// Created by Kim Wittenburg on 15.11.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPSumFunctionTerm.h"
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#import "MPParsedExpression.h"
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@implementation MPSumFunctionTerm
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- (NSDecimalNumber *)doEvaluation:(NSError *__autoreleasing *)error
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{
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MPParsedExpression *startExpression = [self expressionAtIndex:0];
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MPParsedExpression *targetExpression = [self expressionAtIndex:1];
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MPParsedExpression *sumExpression = [self expressionAtIndex:2];
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NSDecimalNumber *start = [startExpression evaluate:error];
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NSDecimalNumber *target = [targetExpression evaluate:error];
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NSDecimalNumber *value = [NSDecimalNumber zero];
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for (NSDecimalNumber *current = start;
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[current compare:target] <= 0;
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current = [current decimalNumberByAdding:[[NSDecimalNumber alloc] initWithInteger:1]]) {
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if (![self redefineVariable:startExpression.definedVariable value:current error:error]) {
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return nil;
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}
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NSDecimalNumber *currentValue = [sumExpression 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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