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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/ime/utf_offset.h"
#include <optional>
#include <string>
#include "base/logging.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace ui {
namespace {
TEST(UtfOffsetTest, Utf16OffsetFromUtf8Offset) {
constexpr struct {
const char* str;
size_t offset;
std::optional<size_t> expect;
} kTestCases[] = {
// 1 byte letters.
{"ab", 0, 0},
{"ab", 1, 1},
{"ab", 2, 2},
{"ab", 3, std::nullopt},
// 2 byte letters. \u03A9=\xCE\xA9 is greek OMEGA.
{"\u03A9\u03A9", 0, 0},
{"\u03A9\u03A9", 1, std::nullopt},
{"\u03A9\u03A9", 2, 1},
{"\u03A9\u03A9", 3, std::nullopt},
{"\u03A9\u03A9", 4, 2},
{"\u03A9\u03A9", 5, std::nullopt},
// 3 byte letters. \u3042=\xE3\x81\x82 is Japanese "A".
{"\u3042\u3042", 0, 0},
{"\u3042\u3042", 1, std::nullopt},
{"\u3042\u3042", 2, std::nullopt},
{"\u3042\u3042", 3, 1},
{"\u3042\u3042", 4, std::nullopt},
{"\u3042\u3042", 5, std::nullopt},
{"\u3042\u3042", 6, 2},
{"\u3042\u3042", 7, std::nullopt},
// 4 byte letters. \U0001F3B7=\xF0\x9F\x8E\xB7 is "SAXOPHONE" emoji.
// Note that a surrogate pair advances by 2 in UTF16.
{"\U0001F3B7\U0001F3B7", 0, 0},
{"\U0001F3B7\U0001F3B7", 1, std::nullopt},
{"\U0001F3B7\U0001F3B7", 2, std::nullopt},
{"\U0001F3B7\U0001F3B7", 3, std::nullopt},
{"\U0001F3B7\U0001F3B7", 4, 2},
{"\U0001F3B7\U0001F3B7", 5, std::nullopt},
{"\U0001F3B7\U0001F3B7", 6, std::nullopt},
{"\U0001F3B7\U0001F3B7", 7, std::nullopt},
{"\U0001F3B7\U0001F3B7", 8, 4},
{"\U0001F3B7\U0001F3B7", 9, std::nullopt},
// Mix case.
{"a\u03A9b\u3042c\U0001F3B7d", 0, 0},
{"a\u03A9b\u3042c\U0001F3B7d", 1, 1},
{"a\u03A9b\u3042c\U0001F3B7d", 2, std::nullopt},
{"a\u03A9b\u3042c\U0001F3B7d", 3, 2},
{"a\u03A9b\u3042c\U0001F3B7d", 4, 3},
{"a\u03A9b\u3042c\U0001F3B7d", 5, std::nullopt},
{"a\u03A9b\u3042c\U0001F3B7d", 6, std::nullopt},
{"a\u03A9b\u3042c\U0001F3B7d", 7, 4},
{"a\u03A9b\u3042c\U0001F3B7d", 8, 5},
{"a\u03A9b\u3042c\U0001F3B7d", 9, std::nullopt},
{"a\u03A9b\u3042c\U0001F3B7d", 10, std::nullopt},
{"a\u03A9b\u3042c\U0001F3B7d", 11, std::nullopt},
{"a\u03A9b\u3042c\U0001F3B7d", 12, 7},
{"a\u03A9b\u3042c\U0001F3B7d", 13, 8},
{"a\u03A9b\u3042c\U0001F3B7d", 14, std::nullopt},
};
for (const auto& test_case : kTestCases) {
EXPECT_EQ(test_case.expect,
Utf16OffsetFromUtf8Offset(test_case.str, test_case.offset))
<< " at " << test_case.str << "[" << test_case.offset << "]";
}
}
TEST(UtfOffsetTest, Utf8OffsetFromUtf16Offset) {
constexpr struct {
const char16_t* str;
size_t offset;
std::optional<size_t> expect;
} kTestCases[] = {
// 1 byte letters.
{u"ab", 0, 0},
{u"ab", 1, 1},
{u"ab", 2, 2},
{u"ab", 3, std::nullopt},
// 2 byte letters.
{u"\u03A9\u03A9", 0, 0},
{u"\u03A9\u03A9", 1, 2},
{u"\u03A9\u03A9", 2, 4},
{u"\u03A9\u03A9", 3, std::nullopt},
// 3 byte letters.
{u"\u3042\u3042", 0, 0},
{u"\u3042\u3042", 1, 3},
{u"\u3042\u3042", 2, 6},
{u"\u3042\u3042", 3, std::nullopt},
// 4 byte letters = surrogate pairs.
{u"\U0001F3B7\U0001F3B7", 0, 0},
{u"\U0001F3B7\U0001F3B7", 1, std::nullopt},
{u"\U0001F3B7\U0001F3B7", 2, 4},
{u"\U0001F3B7\U0001F3B7", 3, std::nullopt},
{u"\U0001F3B7\U0001F3B7", 4, 8},
{u"\U0001F3B7\U0001F3B7", 5, std::nullopt},
{u"\U0001F3B7\U0001F3B7", 6, std::nullopt},
// Mix case.
{u"a\u03A9b\u3042c\U0001F3B7d", 0, 0},
{u"a\u03A9b\u3042c\U0001F3B7d", 1, 1},
{u"a\u03A9b\u3042c\U0001F3B7d", 2, 3},
{u"a\u03A9b\u3042c\U0001F3B7d", 3, 4},
{u"a\u03A9b\u3042c\U0001F3B7d", 4, 7},
{u"a\u03A9b\u3042c\U0001F3B7d", 5, 8},
{u"a\u03A9b\u3042c\U0001F3B7d", 6, std::nullopt},
{u"a\u03A9b\u3042c\U0001F3B7d", 7, 12},
{u"a\u03A9b\u3042c\U0001F3B7d", 8, 13},
{u"a\u03A9b\u3042c\U0001F3B7d", 9, std::nullopt},
};
for (const auto& test_case : kTestCases) {
EXPECT_EQ(test_case.expect,
Utf8OffsetFromUtf16Offset(test_case.str, test_case.offset))
<< " at " << test_case.str << "[" << test_case.offset << "]";
}
}
} // namespace
} // namespace ui
|
