| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef FLUTTER_FML_STRING_RANGE_SANITIZATION_H_ |
| #define FLUTTER_FML_STRING_RANGE_SANITIZATION_H_ |
| |
| #include <Foundation/Foundation.h> |
| |
| namespace fml { |
| |
| // Returns a range encompassing the grapheme cluster in which |index| is located. |
| // |
| // A nil |text| or an index greater than or equal to text.length will result in |
| // `NSRange(NSNotFound, 0)`. |
| NSRange RangeForCharacterAtIndex(NSString* text, NSUInteger index); |
| |
| // Returns a range encompassing the grapheme clusters falling in |range|. |
| // |
| // This method will not alter the length of the input range, but will ensure |
| // that the range's location is not in the middle of a multi-byte unicode |
| // sequence. |
| // |
| // An invalid range will result in `NSRange(NSNotFound, 0)`. |
| NSRange RangeForCharactersInRange(NSString* text, NSRange range); |
| |
| } // namespace fml |
| |
| #endif // FLUTTER_FML_STRING_RANGE_SANITIZATION_H_ |
