1 // Copyright (c) 2011 The Chromium 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 #include "base/i18n/char_iterator.h"
6
7 #include "third_party/icu/source/common/unicode/utf8.h"
8 #include "third_party/icu/source/common/unicode/utf16.h"
9
10 namespace base {
11 namespace i18n {
12
UTF8CharIterator(const std::string * str)13 UTF8CharIterator::UTF8CharIterator(const std::string* str)
14 : str_(reinterpret_cast<const uint8_t*>(str->data())),
15 len_(str->size()),
16 array_pos_(0),
17 next_pos_(0),
18 char_pos_(0),
19 char_(0) {
20 if (len_)
21 U8_NEXT(str_, next_pos_, len_, char_);
22 }
23
24 UTF8CharIterator::~UTF8CharIterator() = default;
25
Advance()26 bool UTF8CharIterator::Advance() {
27 if (array_pos_ >= len_)
28 return false;
29
30 array_pos_ = next_pos_;
31 char_pos_++;
32 if (next_pos_ < len_)
33 U8_NEXT(str_, next_pos_, len_, char_);
34
35 return true;
36 }
37
UTF16CharIterator(const string16 * str)38 UTF16CharIterator::UTF16CharIterator(const string16* str)
39 : str_(reinterpret_cast<const char16*>(str->data())),
40 len_(str->size()),
41 array_pos_(0),
42 next_pos_(0),
43 char_pos_(0),
44 char_(0) {
45 if (len_)
46 ReadChar();
47 }
48
UTF16CharIterator(const char16 * str,size_t str_len)49 UTF16CharIterator::UTF16CharIterator(const char16* str, size_t str_len)
50 : str_(str),
51 len_(str_len),
52 array_pos_(0),
53 next_pos_(0),
54 char_pos_(0),
55 char_(0) {
56 if (len_)
57 ReadChar();
58 }
59
60 UTF16CharIterator::~UTF16CharIterator() = default;
61
Advance()62 bool UTF16CharIterator::Advance() {
63 if (array_pos_ >= len_)
64 return false;
65
66 array_pos_ = next_pos_;
67 char_pos_++;
68 if (next_pos_ < len_)
69 ReadChar();
70
71 return true;
72 }
73
ReadChar()74 void UTF16CharIterator::ReadChar() {
75 // This is actually a huge macro, so is worth having in a separate function.
76 U16_NEXT(str_, next_pos_, len_, char_);
77 }
78
79 } // namespace i18n
80 } // namespace base
81