69 lines
2.2 KiB
Objective-C
69 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 11.11.14.
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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 "MPParsedExpression.h"
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#import "MPSumTerm.h"
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#import "MPEvaluationContext.h"
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@implementation MPTerm
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- (NSDecimalNumber *)evaluate:(NSError *__autoreleasing *)error
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{
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[[MPEvaluationContext sharedContext] push];
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NSDecimalNumber *result = [self doEvaluation:error];
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[[MPEvaluationContext sharedContext] pop];
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return result;
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}
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- (NSDecimalNumber *)doEvaluation:(NSError *__autoreleasing *)error
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{
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NSLog(@"%@", self.class);
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return nil;
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}
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- (BOOL)defineVariable:(NSString *)variableName
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value:(NSDecimalNumber *)value
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error:(NSError *__autoreleasing *)error
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{
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BOOL couldDefineVariable = [[MPEvaluationContext sharedContext] defineVariable:variableName
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value:value];
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if (!couldDefineVariable) {
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if (error) {
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NSString *localizedDescription = [NSString stringWithFormat:NSLocalizedString(@"Redifinition of variable \"%@\".", nil), variableName];
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*error = [NSError errorWithDomain:MPMathKitErrorDomain
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code:100
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userInfo:@{NSLocalizedDescriptionKey: localizedDescription}];
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}
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}
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return couldDefineVariable;
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}
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- (NSDecimalNumber *)valueForVariable:(NSString *)variableName
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error:(NSError *__autoreleasing *)error
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{
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NSDecimalNumber *value = [[MPEvaluationContext sharedContext] valueForVariable:variableName];
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if (!value) {
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if (error) {
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NSString *localizedDescription = [NSString stringWithFormat:NSLocalizedString(@"Undefined variable \"%@\".", nil), variableName];
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*error = [NSError errorWithDomain:MPMathKitErrorDomain
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code:101
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userInfo:@{NSLocalizedDescriptionKey: localizedDescription}];
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}
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}
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return value;
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}
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- (void)undefineVariable:(NSString *)variableName
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{
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[[MPEvaluationContext sharedContext] undefineVariable:variableName];
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}
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@end
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