47 lines
1.3 KiB
Objective-C
47 lines
1.3 KiB
Objective-C
//
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// MPPowerFunction.m
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// MathPad
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//
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// Created by Kim Wittenburg on 30.09.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPPowerFunction.h"
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#import "MPExpression.h"
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@implementation MPPowerFunction
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MPFunctionAccessorImplementation(ExponentExpression, _exponentExpression)
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- (NSArray *)childrenAccessors
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{
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return @[@"exponentExpression"];
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}
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- (BOOL)validate:(MPParseError *__autoreleasing *)error
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{
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if (!self.baseValue) {
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if (error) {
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*error = MPParseError(NSMakeRange([self.parent convertIndex:[self.parent indexOfElement:self]
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fromReferenceFrame:MPElementReferenceFrame
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toReferenceFrame:MPSymbolReferenceFrame], 0), @"No Base for Power");
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}
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return NO;
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}
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return [self.baseValue validate:error] && [[self.exponentExpression parse] validate:error];
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}
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- (NSDecimalNumber *)evaluate
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{
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NSDecimalNumber *base = [self.baseValue evaluate];
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NSDecimalNumber *exponent = [[self.exponentExpression parse] evaluate];
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return [[NSDecimalNumber alloc] initWithDouble:pow(base.doubleValue, exponent.doubleValue)];
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}
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- (NSString *)description
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{
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return [NSString stringWithFormat:@"^%@", self.exponentExpression.description];
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}
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@end
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