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Adding date transformers (ISO 8601 Timestamp <-> NSDate)
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| // TTTDateTransformers.h | ||
| // | ||
| // Copyright (c) 2013 Mattt Thompson | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
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| #import <Foundation/Foundation.h> | ||
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| /** | ||
| */ | ||
| extern NSString * const TTTISO8601DateTransformerName; | ||
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| @interface TTTDateTransformers : NSObject | ||
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| @end |
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| // TTTDateTransformers.m | ||
| // | ||
| // Copyright (c) 2013 Mattt Thompson | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
|
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| #import "TTTDateTransformers.h" | ||
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| #import "NSValueTransformer+TransformerKit.h" | ||
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| #include <time.h> | ||
| #include <xlocale.h> | ||
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| NSString * const TTTISO8601DateTransformerName = @"TTTISO8601DateTransformerName"; | ||
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| static NSString * TTTISO8601TimestampFromDate(NSDate *date) { | ||
| static NSDateFormatter *_iso8601DateFormatter = nil; | ||
| static dispatch_once_t onceToken; | ||
| dispatch_once(&onceToken, ^{ | ||
| _iso8601DateFormatter = [[NSDateFormatter alloc] initWithDateFormat:@"%Y-%m-%dT%H:%M:%S%z" allowNaturalLanguage:NO]; | ||
| [_iso8601DateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]]; | ||
| }); | ||
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| return [_iso8601DateFormatter stringFromDate:date]; | ||
| } | ||
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| static NSDate * TTTDateFromISO8601Timestamp(NSString *timestamp) { | ||
| static int const ISO_8601_MAX_LENGTH = 25; | ||
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| const char *source = [timestamp cStringUsingEncoding:NSUTF8StringEncoding]; | ||
| char destination[ISO_8601_MAX_LENGTH]; | ||
| size_t length = strlen(source); | ||
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| if (length == 0) { | ||
| return nil; | ||
| } | ||
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| if (length == 20 && source[length - 1] == 'Z') { | ||
| memcpy(destination, source, length - 1); | ||
| strncpy(destination + length - 1, "+0000\0", 6); | ||
| } else if (length == 25 && source[22] == ':') { | ||
| memcpy(destination, source, 22); | ||
| memcpy(destination + 22, source + 23, 2); | ||
| } else { | ||
| memcpy(destination, source, MIN(length, ISO_8601_MAX_LENGTH - 1)); | ||
| } | ||
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| destination[sizeof(destination) - 1] = NULL; | ||
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| struct tm time = { | ||
| .tm_isdst = -1, | ||
| }; | ||
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| strptime_l(source, "%FT%T%z", &time, NULL); | ||
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| return [NSDate dateWithTimeIntervalSince1970:mktime(&time)]; | ||
| } | ||
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| @implementation TTTDateTransformers | ||
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| + (void)load { | ||
| @autoreleasepool { | ||
| [NSValueTransformer registerValueTransformerWithName:TTTISO8601DateTransformerName transformedValueClass:[NSDate class] returningTransformedValueWithBlock:^id(id value) { | ||
| return TTTISO8601TimestampFromDate(value); | ||
| } allowingReverseTransformationWithBlock:^id(id value) { | ||
| return TTTDateFromISO8601Timestamp(value); | ||
| }]; | ||
| } | ||
| } | ||
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| @end |
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