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//
// JSONKeyMapper.m
// JSONModel
//
#import "JSONKeyMapper.h"
@implementation JSONKeyMapper
- (instancetype)initWithJSONToModelBlock:(JSONModelKeyMapBlock)toModel modelToJSONBlock:(JSONModelKeyMapBlock)toJSON
{
return [self initWithModelToJSONBlock:toJSON];
}
- (instancetype)initWithModelToJSONBlock:(JSONModelKeyMapBlock)toJSON
{
if (!(self = [self init]))
return nil;
_modelToJSONKeyBlock = toJSON;
return self;
}
- (instancetype)initWithDictionary:(NSDictionary *)map
{
NSDictionary *toJSON = [JSONKeyMapper swapKeysAndValuesInDictionary:map];
return [self initWithModelToJSONDictionary:toJSON];
}
- (instancetype)initWithModelToJSONDictionary:(NSDictionary <NSString *, NSString *> *)toJSON
{
if (!(self = [super init]))
return nil;
_modelToJSONKeyBlock = ^NSString *(NSString *keyName)
{
return [toJSON valueForKeyPath:keyName] ?: keyName;
};
return self;
}
- (JSONModelKeyMapBlock)JSONToModelKeyBlock
{
return nil;
}
+ (NSDictionary *)swapKeysAndValuesInDictionary:(NSDictionary *)dictionary
{
NSArray *keys = dictionary.allKeys;
NSArray *values = [dictionary objectsForKeys:keys notFoundMarker:[NSNull null]];
return [NSDictionary dictionaryWithObjects:keys forKeys:values];
}
- (NSString *)convertValue:(NSString *)value isImportingToModel:(BOOL)importing
{
return [self convertValue:value];
}
- (NSString *)convertValue:(NSString *)value
{
return _modelToJSONKeyBlock(value);
}
+ (instancetype)mapperFromUnderscoreCaseToCamelCase
{
return [self mapperForSnakeCase];
}
+ (instancetype)mapperForSnakeCase
{
return [[self alloc] initWithModelToJSONBlock:^NSString *(NSString *keyName)
{
NSMutableString *result = [NSMutableString stringWithString:keyName];
NSRange range;
// handle upper case chars
range = [result rangeOfCharacterFromSet:[NSCharacterSet uppercaseLetterCharacterSet]];
while (range.location != NSNotFound)
{
NSString *lower = [result substringWithRange:range].lowercaseString;
[result replaceCharactersInRange:range withString:[NSString stringWithFormat:@"_%@", lower]];
range = [result rangeOfCharacterFromSet:[NSCharacterSet uppercaseLetterCharacterSet]];
}
// handle numbers
range = [result rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet]];
while (range.location != NSNotFound)
{
NSRange end = [result rangeOfString:@"\\D" options:NSRegularExpressionSearch range:NSMakeRange(range.location, result.length - range.location)];
// spans to the end of the key name
if (end.location == NSNotFound)
end = NSMakeRange(result.length, 1);
NSRange replaceRange = NSMakeRange(range.location, end.location - range.location);
NSString *digits = [result substringWithRange:replaceRange];
[result replaceCharactersInRange:replaceRange withString:[NSString stringWithFormat:@"_%@", digits]];
range = [result rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet] options:0 range:NSMakeRange(end.location + 1, result.length - end.location - 1)];
}
return result;
}];
}
+ (instancetype)mapperForTitleCase
{
return [[self alloc] initWithModelToJSONBlock:^NSString *(NSString *keyName)
{
return [keyName stringByReplacingCharactersInRange:NSMakeRange(0, 1) withString:[keyName substringToIndex:1].uppercaseString];
}];
}
+ (instancetype)mapperFromUpperCaseToLowerCase
{
return [[self alloc] initWithModelToJSONBlock:^NSString *(NSString *keyName)
{
return keyName.uppercaseString;
}];
}
+ (instancetype)mapper:(JSONKeyMapper *)baseKeyMapper withExceptions:(NSDictionary *)exceptions
{
NSDictionary *toJSON = [JSONKeyMapper swapKeysAndValuesInDictionary:exceptions];
return [self baseMapper:baseKeyMapper withModelToJSONExceptions:toJSON];
}
+ (instancetype)baseMapper:(JSONKeyMapper *)baseKeyMapper withModelToJSONExceptions:(NSDictionary *)toJSON
{
return [[self alloc] initWithModelToJSONBlock:^NSString *(NSString *keyName)
{
if (!keyName)
return nil;
if (toJSON[keyName])
return toJSON[keyName];
return baseKeyMapper.modelToJSONKeyBlock(keyName);
}];
}
@end