91 lines
3.1 KiB
Objective-C
91 lines
3.1 KiB
Objective-C
//
|
|
// MPSumFunction.m
|
|
// MathPad
|
|
//
|
|
// Created by Kim Wittenburg on 22.04.14.
|
|
// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
|
|
//
|
|
|
|
#import "MPSumFunction.h"
|
|
#import "MPExpression.h"
|
|
|
|
#import "MPExpressionEvaluator.h"
|
|
#import "MPEvaluationContext.h"
|
|
|
|
// TODO: Use this macro elsewhere
|
|
#define ReturnIfNil(test) if(test == nil) return nil
|
|
|
|
@implementation MPSumFunction
|
|
|
|
MPFunctionAccessorImplementation(StartExpression, _startExpression)
|
|
MPFunctionAccessorImplementation(TargetExpression, _targetExpression)
|
|
MPFunctionAccessorImplementation(SumExpression, _sumExpression)
|
|
|
|
- (NSArray *)childrenAccessors
|
|
{
|
|
return @[@"startExpression", @"targetExpression", @"sumExpression"];
|
|
}
|
|
|
|
#pragma mark Evaluating Functions
|
|
- (MPTerm *)parseWithError:(MPParseError *__autoreleasing *)error
|
|
{
|
|
MPExpressionEvaluator *startEvaluator = self.startExpression.evaluator;
|
|
MPTerm *start = [startEvaluator parseExpectingVariable:YES
|
|
error:error];
|
|
ReturnIfNil(start);
|
|
|
|
MPExpressionEvaluator *targetEvaluator = self.targetExpression.evaluator;
|
|
MPTerm *target = [targetEvaluator parseExpectingVariable:NO
|
|
error:error];
|
|
ReturnIfNil(target);
|
|
|
|
NSString *variable = startEvaluator.definedVariable.copy;
|
|
|
|
[[MPEvaluationContext sharedContext] push];
|
|
[[MPEvaluationContext sharedContext] defineVariable:variable withValue:[NSNull null]];
|
|
MPExpressionEvaluator *sumEvaluator = self.sumExpression.evaluator;
|
|
MPTerm *sum = [sumEvaluator parseExpectingVariable:NO
|
|
error:error];
|
|
ReturnIfNil(sum);
|
|
[[MPEvaluationContext sharedContext] pop];
|
|
|
|
return [[MPTerm alloc] initWithBlock:^NSDecimalNumber *{
|
|
[[MPEvaluationContext sharedContext] push];
|
|
NSDecimalNumber *value = [NSDecimalNumber zero];
|
|
NSDecimalNumber *startValue = [start evaluate];
|
|
NSDecimalNumber *targetValue = [target evaluate];
|
|
for (NSDecimalNumber *iterator = startValue;
|
|
[iterator compare:targetValue] <= 0 ;
|
|
iterator = [iterator decimalNumberByAdding:[[NSDecimalNumber alloc] initWithInteger:1]]) {
|
|
[[MPEvaluationContext sharedContext] defineVariable:variable withValue:iterator];
|
|
value = [value decimalNumberByAdding:[sum evaluate]];
|
|
}
|
|
[[MPEvaluationContext sharedContext] pop];
|
|
return value;
|
|
}];
|
|
}
|
|
|
|
#pragma mark Working With Functions
|
|
/*
|
|
- (BOOL)isEqualToFunction:(MPFunction *)aFunction
|
|
{
|
|
if (![aFunction isKindOfClass:[MPSumFunction class]]) {
|
|
return NO;
|
|
}
|
|
MPSumFunction *sumFunction = (MPSumFunction *)aFunction;
|
|
if (![self.startExpression isEqualToExpression:sumFunction.startExpression]) {
|
|
return NO;
|
|
}
|
|
if (![self.targetExpression isEqualToExpression:sumFunction.targetExpression]) {
|
|
return NO;
|
|
}
|
|
return [self.sumExpression isEqualToExpression:sumFunction.sumExpression];
|
|
}*/
|
|
|
|
- (NSString *)description
|
|
{
|
|
return [NSString stringWithFormat:@"Sum(From: %@; To: %@; Using: %@)", self.startExpression, self.targetExpression, self.sumExpression];
|
|
}
|
|
|
|
@end
|