[ios] Added input validators.

iphone/Maps/Classes/InputValidators/MWMInputEmailValidator.h

@@ -0,0 +1,5 @@
+#import "MWMInputValidator.h"
+
+@interface MWMInputEmailValidator : MWMInputValidator
+
+@end

iphone/Maps/Classes/InputValidators/MWMInputEmailValidator.mm

@@ -0,0 +1,32 @@
+#import "MWMInputEmailValidator.h"
+
+static NSString * const kEmailRegexPattern = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}";
+
+@implementation MWMInputEmailValidator
+
+- (BOOL)validateString:(NSString *)string
+{
+  if (![super validateString:string])
+    return NO;
+  NSError * err;
+  NSRegularExpression * regex =
+      [NSRegularExpression regularExpressionWithPattern:kEmailRegexPattern
+                                                options:NSRegularExpressionCaseInsensitive
+                                                  error:&err];
+  NSAssert(!err, @"Invalid regular expression");
+  NSMutableArray<NSString *> * matches = [@[] mutableCopy];
+  NSRange const range = {0, string.length};
+  [regex enumerateMatchesInString:string
+                          options:NSMatchingReportProgress
+                            range:range
+                       usingBlock:^(NSTextCheckingResult * _Nullable result, NSMatchingFlags flags,
+                                    BOOL * _Nonnull stop)
+  {
+    [matches addObject:[string substringWithRange:result.range]];
+  }];
+  if (matches.count != 1)
+    return NO;
+  return [matches[0] isEqualToString:string];
+}
+
+@end

iphone/Maps/Classes/InputValidators/MWMInputLoginValidator.h

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+#import "MWMInputValidator.h"
+
+@interface MWMInputLoginValidator : MWMInputValidator
+
+@end

iphone/Maps/Classes/InputValidators/MWMInputLoginValidator.mm

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+#import "MWMInputLoginValidator.h"
+
+NSUInteger constexpr minLoginLength = 3;
+
+@implementation MWMInputLoginValidator
+
+- (BOOL)validateString:(NSString *)string
+{
+  if (![super validateString:string])
+    return NO;
+  return string.length >= minLoginLength;
+}
+
+@end

iphone/Maps/Classes/InputValidators/MWMInputPasswordValidator.h

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+#import "MWMInputValidator.h"
+
+@interface MWMInputPasswordValidator : MWMInputValidator
+
+@end

iphone/Maps/Classes/InputValidators/MWMInputPasswordValidator.mm

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+#import "MWMInputPasswordValidator.h"
+
+NSUInteger constexpr minPasswordLength = 8;
+
+@implementation MWMInputPasswordValidator
+
+- (BOOL)validateString:(NSString *)string
+{
+  if (![super validateString:string])
+    return NO;
+  return string.length >= minPasswordLength;
+}
+
+@end

iphone/Maps/Classes/InputValidators/MWMInputValidator.h

@@ -0,0 +1,6 @@
+@interface MWMInputValidator : NSObject
+
+- (BOOL)validateInput:(UITextField *)input;
+- (BOOL)validateString:(NSString *)string;
+
+@end

iphone/Maps/Classes/InputValidators/MWMInputValidator.mm

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+#import "MWMInputValidator.h"
+
+@implementation MWMInputValidator
+
+- (BOOL)validateInput:(UITextField *)input
+{
+  return [self validateString:input.text];
+}
+
+- (BOOL)validateString:(NSString *)string
+{
+  return YES;
+}
+
+@end

iphone/Maps/Classes/InputValidators/MWMInputValidatorFactory.h

@@ -0,0 +1,7 @@
+#import "MWMInputValidator.h"
+
+@interface MWMInputValidatorFactory : NSObject
+
++ (MWMInputValidator *)validator:(NSString *)validator;
+
+@end

iphone/Maps/Classes/InputValidators/MWMInputValidatorFactory.mm

@@ -0,0 +1,20 @@
+#import "MWMInputEmailValidator.h"
+#import "MWMInputLoginValidator.h"
+#import "MWMInputPasswordValidator.h"
+#import "MWMInputValidator.h"
+#import "MWMInputValidatorFactory.h"
+
+@implementation MWMInputValidatorFactory
+
++ (MWMInputValidator *)validator:(NSString *)validator
+{
+  if ([validator isEqualToString:[MWMInputLoginValidator className]])
+    return [[MWMInputLoginValidator alloc] init];
+  if ([validator isEqualToString:[MWMInputPasswordValidator className]])
+    return [[MWMInputPasswordValidator alloc] init];
+  if ([validator isEqualToString:[MWMInputEmailValidator className]])
+    return [[MWMInputEmailValidator alloc] init];
+  return [[MWMInputValidator alloc] init];
+}
+
+@end