use platform-specific NSString for case changes on OS X/iOS

refs #309

1 files changed, 21 insertions, 0 deletions

diff --git a/common/platform_nsstring.mm b/common/platform_nsstring.mm
new file mode 100644
index 0000000000..9119f2a8fe
--- /dev/null
+++ b/common/platform_nsstring.mm
@@ -0,0 +1,21 @@
+#import <Foundation/Foundation.h>
+
+#include <mbgl/platform/platform.hpp>
+
+namespace mbgl {
+namespace platform {
+
+std::string uppercase(const std::string &string) {
+    NSString *nsstring = [[NSString alloc] initWithBytesNoCopy:const_cast<char *>(string.data()) length:string.size() encoding:NSUTF8StringEncoding freeWhenDone:NO];
+    nsstring = [nsstring uppercaseString];
+    return { [nsstring cStringUsingEncoding:NSUTF8StringEncoding], [nsstring lengthOfBytesUsingEncoding:NSUTF8StringEncoding] };
+}
+
+std::string lowercase(const std::string &string) {
+    NSString *nsstring = [[NSString alloc] initWithBytesNoCopy:const_cast<char *>(string.data()) length:string.size() encoding:NSUTF8StringEncoding freeWhenDone:NO];
+    nsstring = [nsstring lowercaseString];
+    return { [nsstring cStringUsingEncoding:NSUTF8StringEncoding], [nsstring lengthOfBytesUsingEncoding:NSUTF8StringEncoding] };
+}
+
+}
+}
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