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//
// NSValueTransformer+MTLInversionAdditions.m
// Mantle
//
// Created by Justin Spahr-Summers on 2013-05-18.
// Copyright (c) 2013 GitHub. All rights reserved.
//
#import "NSValueTransformer+MTLInversionAdditions.h"
#import "MTLTransformerErrorHandling.h"
#import "MTLValueTransformer.h"
@implementation NSValueTransformer (MTLInversionAdditions)
- (NSValueTransformer *)mtl_invertedTransformer {
NSParameterAssert(self.class.allowsReverseTransformation);
if ([self conformsToProtocol:@protocol(MTLTransformerErrorHandling)]) {
NSParameterAssert([self respondsToSelector:@selector(reverseTransformedValue:success:error:)]);
id<MTLTransformerErrorHandling> errorHandlingSelf = (id)self;
return [MTLValueTransformer transformerUsingForwardBlock:^(id value, BOOL *success, NSError **error) {
return [errorHandlingSelf reverseTransformedValue:value success:success error:error];
} reverseBlock:^(id value, BOOL *success, NSError **error) {
return [errorHandlingSelf transformedValue:value success:success error:error];
}];
} else {
return [MTLValueTransformer transformerUsingForwardBlock:^(id value, BOOL *success, NSError **error) {
return [self reverseTransformedValue:value];
} reverseBlock:^(id value, BOOL *success, NSError **error) {
return [self transformedValue:value];
}];
}
}
@end