52 lines
1.1 KiB
Objective-C
52 lines
1.1 KiB
Objective-C
//
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// MPFactorial.m
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// MathPad
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//
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// Created by Kim Wittenburg on 11.10.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPFactorial.h"
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#import "MPTokenStream.h"
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#import "MPToken.h"
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@implementation MPFactorial
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- (instancetype)init
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{
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self = [super init];
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if (self) {
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}
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return self;
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}
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- (instancetype)initWithTokenStream:(MPTokenStream *)tokenStream
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{
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self = [self init];
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if (self) {
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[tokenStream beginIgnoringWhitespaceTokens];
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if (tokenStream.currentToken.tokenType != MPFactorialToken) {
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[tokenStream endIgnoringOrAcceptingWhitespaceTokens];
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return nil;
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} else {
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[tokenStream currentTokenConsumed];
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}
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[tokenStream endIgnoringOrAcceptingWhitespaceTokens];
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}
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return self;
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}
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- (BOOL)validate:(NSError *__autoreleasing *)error
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{
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return [self.value validate:error];
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}
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- (NSDecimalNumber *)evaluate
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{
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double value = [self.value evaluate].doubleValue;
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return [[NSDecimalNumber alloc] initWithDouble:tgamma(value+1)];
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}
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@end
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