1 files changed, 49 insertions, 0 deletions
diff --git a/platform/macos/app/MGLVectorSource+MBXAdditions.m b/platform/macos/app/MGLVectorSource+MBXAdditions.m
new file mode 100644
index 0000000000..f59b72aa9f
--- /dev/null
+++ b/platform/macos/app/MGLVectorSource+MBXAdditions.m
@@ -0,0 +1,49 @@
+#import "MGLVectorSource+MBXAdditions.h"
+
+@implementation MGLVectorSource (MBXAdditions)
+
++ (NS_SET_OF(NSString *) *)mapboxStreetsLanguages {
+    // https://www.mapbox.com/vector-tiles/mapbox-streets-v7/#overview
+    static dispatch_once_t onceToken;
+    static NS_SET_OF(NSString *) *mapboxStreetsLanguages;
+    dispatch_once(&onceToken, ^{
+        mapboxStreetsLanguages = [NSSet setWithObjects:@"en", @"es", @"fr", @"de", @"ru", @"zh", nil];
+    });
+    return mapboxStreetsLanguages;
+}
+
++ (nullable NSString *)preferredMapboxStreetsLanguage {
+    for (NSString *language in [NSLocale preferredLanguages]) {
+        NSString *languageCode = [[NSLocale localeWithLocaleIdentifier:language] objectForKey:NSLocaleLanguageCode];
+        if ([[MGLVectorSource mapboxStreetsLanguages] containsObject:languageCode]) {
+            return languageCode;
+        }
+    }
+    return nil;
+}
+
+- (BOOL)isMapboxStreets {
+    NSURL *url = self.configurationURL;
+    if (![url.scheme isEqualToString:@"mapbox"]) {
+        return NO;
+    }
+    NSArray *identifiers = [url.host componentsSeparatedByString:@","];
+    return [identifiers containsObject:@"mapbox.mapbox-streets-v7"] || [identifiers containsObject:@"mapbox.mapbox-streets-v6"];
+}
+
+- (NS_DICTIONARY_OF(NSString *, NSString *) *)localizedKeysByKeyForPreferredLanguage:(nullable NSString *)preferredLanguage {
+    if (!self.mapboxStreets) {
+        return @{};
+    }
+    
+    // Replace {name} and {name_*} with the matching localized name tag.
+    NSString *localizedKey = preferredLanguage ? [NSString stringWithFormat:@"name_%@", preferredLanguage] : @"name";
+    NSMutableDictionary *localizedKeysByKey = [NSMutableDictionary dictionaryWithObject:localizedKey forKey:@"name"];
+    for (NSString *languageCode in [MGLVectorSource mapboxStreetsLanguages]) {
+        NSString *key = [NSString stringWithFormat:@"name_%@", languageCode];
+        localizedKeysByKey[key] = localizedKey;
+    }
+    return localizedKeysByKey;
+}
+
+@end