1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_UTF16_TEXT_ITERATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_UTF16_TEXT_ITERATOR_H_
#include <unicode/utf16.h>
#include "base/containers/span.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/character_names.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
class PLATFORM_EXPORT UTF16TextIterator {
STACK_ALLOCATED();
public:
// The passed in UChar pointer starts at 'offset'. The iterator operates on
// the range [offset, endOffset].
// 'length' denotes the maximum length of the UChar array, which might exceed
// 'endOffset'.
explicit UTF16TextIterator(base::span<const UChar> characters)
: characters_(characters.data()),
characters_end_(characters.data() + characters.size()),
size_(base::checked_cast<wtf_size_t>(characters.size())) {}
UTF16TextIterator(const UTF16TextIterator&) = delete;
UTF16TextIterator& operator=(const UTF16TextIterator&) = delete;
inline bool Consume(UChar32& character) {
if (offset_ >= size_) {
return false;
}
character = *characters_;
current_glyph_length_ = 1;
if (!U16_IS_SURROGATE(character))
return true;
return ConsumeSurrogatePair(character);
}
void Advance() {
characters_ += current_glyph_length_;
offset_ += current_glyph_length_;
}
unsigned Offset() const { return offset_; }
unsigned Size() const { return size_; }
const UChar* Characters() const { return characters_; }
const UChar* GlyphEnd() const { return characters_ + current_glyph_length_; }
private:
bool IsValidSurrogatePair(UChar32&);
bool ConsumeSurrogatePair(UChar32&);
void ConsumeMultipleUChar();
const UChar* characters_;
const UChar* const characters_end_;
unsigned offset_ = 0;
const unsigned size_;
unsigned current_glyph_length_ = 0;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_UTF16_TEXT_ITERATOR_H_
|
