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Dan Field
30 lines
1.1 KiB
Plaintext
30 lines
1.1 KiB
Plaintext
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/fml/platform/darwin/string_range_sanitization.h"
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namespace fml {
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NSRange RangeForCharacterAtIndex(NSString* text, NSUInteger index) {
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if (text == nil || index >= text.length) {
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return NSMakeRange(NSNotFound, 0);
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}
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if (index < text.length)
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return [text rangeOfComposedCharacterSequenceAtIndex:index];
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return NSMakeRange(index, 0);
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}
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NSRange RangeForCharactersInRange(NSString* text, NSRange range) {
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if (text == nil || range.location + range.length > text.length) {
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return NSMakeRange(NSNotFound, 0);
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}
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NSRange sanitizedRange = [text rangeOfComposedCharacterSequencesForRange:range];
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// We don't want to override the length, we just want to make sure we don't
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// select into the middle of a multi-byte character. Taking the
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// `sanitizedRange`'s length will end up altering the actual selection.
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return NSMakeRange(sanitizedRange.location, range.length);
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}
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} // namespace fml
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