141 lines
4.5 KiB
Objective-C
141 lines
4.5 KiB
Objective-C
//
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// MPFunctionValue.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 "MPFunctionValue.h"
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#import "MPMathRules.h"
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double defaultFunction(double value) {return value;};
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@implementation MPFunctionValue {
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NSDecimalNumber *(^_function)(NSDecimalNumber *);
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}
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- (id)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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switch (tokenStream.currentToken.tokenType) {
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case MPSinToken:
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[tokenStream currentTokenConsumed];
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_functionName = @"sin";
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return [self initWithTokenStream:tokenStream
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function:&sin
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takesArcValue:YES
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returnsArcValue:NO];
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case MPCosToken:
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[tokenStream currentTokenConsumed];
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_functionName = @"cos";
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return [self initWithTokenStream:tokenStream
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function:&cos
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takesArcValue:YES
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returnsArcValue:NO];
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case MPTanToken:
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[tokenStream currentTokenConsumed];
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_functionName = @"tan";
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return [self initWithTokenStream:tokenStream
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function:&tan
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takesArcValue:YES
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returnsArcValue:NO];
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case MPASinToken:
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[tokenStream currentTokenConsumed];
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_functionName = @"asin";
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return [self initWithTokenStream:tokenStream
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function:&asin
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takesArcValue:YES
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returnsArcValue:NO];
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case MPACosToken:
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[tokenStream currentTokenConsumed];
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_functionName = @"acos";
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return [self initWithTokenStream:tokenStream
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function:&acos
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takesArcValue:YES
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returnsArcValue:NO];
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case MPATanToken:
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[tokenStream currentTokenConsumed];
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_functionName = @"atan";
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return [self initWithTokenStream:tokenStream
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function:&atan
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takesArcValue:YES
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returnsArcValue:NO];
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default:
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@throw [NSException exceptionWithName:NSInternalInconsistencyException
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reason:@"Expected Function"
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userInfo:nil];
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break;
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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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function:(double (*)(double))function
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takesArcValue:(BOOL)takesArc
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returnsArcValue:(BOOL)returnsArc
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{
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self = [self init];
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if (self) {
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_valueGroup = [[MPValueGroup alloc] initWithTokenStream:tokenStream];
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id __weak weakSelf = self;
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_function = ^(NSDecimalNumber *value){
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if (takesArc) {
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value = [weakSelf convertToRadiantsIfNecessary:value];
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}
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NSDecimalNumber *returnValue = [[NSDecimalNumber alloc] initWithDouble:function(value.doubleValue)];
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if (returnsArc) {
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returnValue = [weakSelf convertToDegreesIfNecessary:returnValue];
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}
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return returnValue;
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};
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}
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return self;
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}
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- (NSDecimalNumber *)convertToRadiantsIfNecessary:(NSDecimalNumber *)degrees
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{
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if ([MPMathRules sharedRules].isUsingDegrees) {
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// * M_PI / 180
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return [[degrees decimalNumberByMultiplyingBy:[[NSDecimalNumber alloc] initWithDouble:M_PI]] decimalNumberByDividingBy:[[NSDecimalNumber alloc] initWithInteger:180]];
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} else {
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return degrees;
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}
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}
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- (NSDecimalNumber *)convertToDegreesIfNecessary:(NSDecimalNumber *)radiants
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{
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if ([MPMathRules sharedRules].isUsingDegrees) {
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// * 180 / M_PI
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return [[radiants decimalNumberByMultiplyingBy:[[NSDecimalNumber alloc] initWithInteger:180]] decimalNumberByDividingBy:[[NSDecimalNumber alloc] initWithDouble:M_PI]];
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} else {
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return radiants;
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}
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}
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- (BOOL)validate:(NSError *__autoreleasing *)error
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{
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return [self.valueGroup validate:error];
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}
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- (NSDecimalNumber *)evaluate
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{
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return _function([self.valueGroup evaluate]);
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}
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@end
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