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Merge pull request #4349 from osmandapp/arabic_norm
Arabic normalizer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| #import <Foundation/Foundation.h> | ||
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| @interface OAArabicNormalizer : NSObject | ||
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| + (BOOL)isSpecialArabic:(NSString *)text; | ||
| + (NSString *)normalize:(NSString *)text; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,100 @@ | ||
| #import "OAArabicNormalizer.h" | ||
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| @implementation OAArabicNormalizer | ||
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| static NSRegularExpression *diacriticRegex; | ||
| static NSString *const kArabicDigits = @"٠١٢٣٤٥٦٧٨٩"; | ||
| static NSString *const kDigitsReplacement = @"0123456789"; | ||
| static NSString *const kKashida = @"\u0640"; | ||
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| + (void)initialize { | ||
| NSError *error = nil; | ||
| diacriticRegex = [NSRegularExpression regularExpressionWithPattern:@"[\u064B-\u0652]" | ||
| options:0 | ||
| error:&error]; | ||
| if (error) { | ||
| NSLog(@"Error initializing regex: %@", error.localizedDescription); | ||
| } | ||
| } | ||
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| + (BOOL)isSpecialArabic:(NSString *)text { | ||
| if (text == nil || text.length == 0) { | ||
| return NO; | ||
| } | ||
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| unichar firstChar = [text characterAtIndex:0]; | ||
| if ([self isArabicCharacter:firstChar]) { | ||
| for (NSUInteger i = 0; i < text.length; i++) { | ||
| unichar c = [text characterAtIndex:i]; | ||
| if ([self isDiacritic:c] || [self isArabicDigit:c] || [self isKashida:c]) { | ||
| return YES; | ||
| } | ||
| } | ||
| } | ||
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| return NO; | ||
| } | ||
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| + (NSString *)normalize:(NSString *)text { | ||
| if (text == nil || text.length == 0) { | ||
| return text; | ||
| } | ||
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| // Remove diacritics | ||
| NSMutableString *result = [NSMutableString stringWithString:text]; | ||
| result = [[diacriticRegex stringByReplacingMatchesInString:result | ||
| options:0 | ||
| range:NSMakeRange(0, result.length) | ||
| withTemplate:@""] mutableCopy]; | ||
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| // Remove Kashida | ||
| [result replaceOccurrencesOfString:kKashida | ||
| withString:@"" | ||
| options:0 | ||
| range:NSMakeRange(0, result.length)]; | ||
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| return [self replaceDigits:result]; | ||
| } | ||
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| + (NSString *)replaceDigits:(NSString *)text { | ||
| if (text == nil || text.length == 0) { | ||
| return nil; | ||
| } | ||
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| unichar firstChar = [text characterAtIndex:0]; | ||
| if (![self isArabicCharacter:firstChar]) { | ||
| return text; | ||
| } | ||
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| NSMutableString *mutableText = [text mutableCopy]; | ||
| for (NSUInteger i = 0; i < kArabicDigits.length; i++) { | ||
| unichar arabicDigit = [kArabicDigits characterAtIndex:i]; | ||
| NSString *replacement = [NSString stringWithFormat:@"%c", [kDigitsReplacement characterAtIndex:i]]; | ||
| NSString *arabicDigitStr = [NSString stringWithFormat:@"%C", arabicDigit]; | ||
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| [mutableText replaceOccurrencesOfString:arabicDigitStr | ||
| withString:replacement | ||
| options:0 | ||
| range:NSMakeRange(0, mutableText.length)]; | ||
| } | ||
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| return mutableText; | ||
| } | ||
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| + (BOOL)isDiacritic:(unichar)c { | ||
| return (c >= 0x064B && c <= 0x0652); | ||
| } | ||
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| + (BOOL)isArabicDigit:(unichar)c { | ||
| return (c >= 0x0660 && c <= 0x0669); | ||
| } | ||
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| + (BOOL)isKashida:(unichar)c { | ||
| return (c == 0x0640); | ||
| } | ||
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| + (BOOL)isArabicCharacter:(unichar)c { | ||
| return (c >= 0x0600 && c <= 0x06FF); | ||
| } | ||
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| @end |
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