95 lines
2.2 KiB
Objective-C
95 lines
2.2 KiB
Objective-C
//
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// MPTerm.m
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// MathPad
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//
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// Created by Kim Wittenburg on 27.09.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPTerm.h"
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#import "MPEvaluationContext.h"
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@interface MPTerm ()
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@property (nonatomic, copy) NSDecimalNumber *(^block)();
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@end
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@implementation MPTerm
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- (instancetype)initWithBlock:(NSDecimalNumber *(^)())block
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{
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self = [super init];
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if (self) {
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self.block = block;
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}
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return self;
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}
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- (instancetype)initWithNumber:(NSDecimalNumber *)number
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{
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return [self initWithBlock:^NSDecimalNumber *{
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return number;
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}];
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}
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- (instancetype)initWithSummands:(NSArray *)summands
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{
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return [self initWithBlock:^NSDecimalNumber *{
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NSDecimalNumber *value = [NSDecimalNumber zero];
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for (MPTerm *term in summands) {
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value = [value decimalNumberByAdding:[term evaluate]];
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}
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return value;
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}];
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}
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- (instancetype)initWithFactors:(NSArray *)factors
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{
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return [self initWithBlock:^NSDecimalNumber *{
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NSDecimalNumber *value = [NSDecimalNumber one];
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for (MPTerm *term in factors) {
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value = [value decimalNumberByMultiplyingBy:[term evaluate]];
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}
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return value;
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}];
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}
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- (instancetype)initWithVariable:(NSString *)variable
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{
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return [self initWithBlock:^NSDecimalNumber *{
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return [[MPEvaluationContext sharedContext] valueForVariable:variable];
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}];
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}
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- (instancetype)initWithSinOfTerm:(MPTerm *)term
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{
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return [self initWithBlock:^NSDecimalNumber *{
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NSDecimalNumber *sinValue = [term evaluate];
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return [[NSDecimalNumber alloc] initWithDouble:sin(sinValue.doubleValue)];
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}];
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}
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- (instancetype)initWithCosOfTerm:(MPTerm *)term
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{
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return [self initWithBlock:^NSDecimalNumber *{
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NSDecimalNumber *cosValue = [term evaluate];
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return [[NSDecimalNumber alloc] initWithDouble:cos(cosValue.doubleValue)];
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}];
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}
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- (instancetype)initWithTanOfTerm:(MPTerm *)term
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{
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return [self initWithBlock:^NSDecimalNumber *{
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NSDecimalNumber *tanValue = [term evaluate];
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return [[NSDecimalNumber alloc] initWithDouble:tan(tanValue.doubleValue)];
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}];
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}
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- (NSDecimalNumber *)evaluate
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{
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return self.block();
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}
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@end
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