Flutter Engine
string_range_sanitization.h
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef FLUTTER_FML_STRING_RANGE_SANITIZATION_H_
6 #define FLUTTER_FML_STRING_RANGE_SANITIZATION_H_
7 
8 #include <Foundation/Foundation.h>
9 
10 namespace fml {
11 
12 // Returns a range encompassing the grapheme cluster in which |index| is located.
13 //
14 // A nil |text| or an index greater than or equal to text.length will result in
15 // `NSRange(NSNotFound, 0)`.
16 NSRange RangeForCharacterAtIndex(NSString* text, NSUInteger index);
17 
18 // Returns a range encompassing the grapheme clusters falling in |range|.
19 //
20 // This method will not alter the length of the input range, but will ensure
21 // that the range's location is not in the middle of a multi-byte unicode
22 // sequence.
23 //
24 // An invalid range will result in `NSRange(NSNotFound, 0)`.
25 NSRange RangeForCharactersInRange(NSString* text, NSRange range);
26 
27 } // namespace fml
28 
29 #endif // FLUTTER_FML_STRING_RANGE_SANITIZATION_H_
NSRange RangeForCharactersInRange(NSString *text, NSRange range)
NSRange RangeForCharacterAtIndex(NSString *text, NSUInteger index)
Definition: ascii_trie.cc:9