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///
/// Copyright (c) 2016 Dropbox, Inc. All rights reserved.
///
#import "DBStoneValidators.h"
@implementation DBStoneValidators
+ (void (^)(NSString *))stringValidator:(NSNumber *)minLength
maxLength:(NSNumber *)maxLength
pattern:(NSString *)pattern
{
void (^validator)(NSString *) = ^(NSString *value) {
if (minLength != nil) {
if ([value length] < [minLength unsignedIntegerValue]) {
NSString *exceptionMessage =
[NSString stringWithFormat:@"value must be at least %@ characters", [minLength stringValue]];
[[self class] raiseIllegalStateErrorWithMessage:exceptionMessage];
}
}
if (maxLength != nil) {
if ([value length] > [maxLength unsignedIntegerValue]) {
NSString *exceptionMessage =
[NSString stringWithFormat:@"value must be at most %@ characters", [minLength stringValue]];
[[self class] raiseIllegalStateErrorWithMessage:exceptionMessage];
}
}
if (pattern != nil && pattern.length != 0) {
NSError *error;
NSRegularExpression *re = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:&error];
NSArray *matches = [re matchesInString:value options:0 range:NSMakeRange(0, [value length])];
if ([matches count] == 0) {
NSString *exceptionMessage =
[NSString stringWithFormat:@"value must match pattern \"%@\"", [re pattern]];
[[self class] raiseIllegalStateErrorWithMessage:exceptionMessage];
}
}
};
return validator;
}
+ (void (^)(NSNumber *))numericValidator:(NSNumber *)minValue maxValue:(NSNumber *)maxValue
{
void (^validator)(NSNumber *) = ^(NSNumber *value) {
if (minValue != nil) {
if ([value unsignedIntegerValue] < [minValue unsignedIntegerValue]) {
NSString *exceptionMessage =
[NSString stringWithFormat:@"value must be at least %@", [minValue stringValue]];
[[self class] raiseIllegalStateErrorWithMessage:exceptionMessage];
}
}
if (maxValue != nil) {
if ([value unsignedIntegerValue] > [maxValue unsignedIntegerValue]) {
NSString *exceptionMessage =
[NSString stringWithFormat:@"value must be at most %@", [maxValue stringValue]];
[[self class] raiseIllegalStateErrorWithMessage:exceptionMessage];
}
}
};
return validator;
}
+ (void (^)(NSArray<id> *))arrayValidator:(NSNumber *)minItems
maxItems:(NSNumber *)maxItems
itemValidator:(void (^)(id))itemValidator
{
void (^validator)(NSArray<id> *) = ^(NSArray<id> *value) {
if (minItems != nil) {
if ([value count] < [minItems unsignedIntegerValue]) {
NSString *exceptionMessage =
[NSString stringWithFormat:@"value must be at least %@ items", [minItems stringValue]];
[[self class] raiseIllegalStateErrorWithMessage:exceptionMessage];
}
}
if (maxItems != nil) {
if ([value count] > [maxItems unsignedIntegerValue]) {
NSString *exceptionMessage =
[NSString stringWithFormat:@"value must be at most %@ items", [maxItems stringValue]];
[[self class] raiseIllegalStateErrorWithMessage:exceptionMessage];
}
}
if (itemValidator != nil) {
for (id item in value) {
itemValidator(item);
}
}
};
return validator;
}
+ (void (^)(NSDictionary<NSString *, id> *))mapValidator:(void (^)(id))itemValidator
{
void (^validator)(NSDictionary<NSString *, id> *) = ^(NSDictionary<NSString *, id> *value) {
if (itemValidator != nil) {
for (id key in value) {
itemValidator(value[key]);
}
}
};
return validator;
}
+ (void (^)(id))nullableValidator:(void (^)(id))internalValidator
{
void (^validator)(id) = ^(id value) {
if (value != nil) {
internalValidator(value);
}
};
return validator;
}
+ (void (^)(id))nonnullValidator:(void (^)(id))internalValidator
{
void (^validator)(id) = ^(id value) {
if (value == nil) {
[[self class] raiseIllegalStateErrorWithMessage:@"Value must not be `nil`"];
}
if (internalValidator != nil) {
internalValidator(value);
}
};
return validator;
}
+ (void)raiseIllegalStateErrorWithMessage:(NSString *)message
{
NSString *exceptionMessage =
[NSString stringWithFormat:@"%@:\n%@", message, [[NSThread callStackSymbols] objectAtIndex:0]];
[NSException raise:@"IllegalStateException" format:exceptionMessage, nil];
}
@end
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