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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/i18n/char_iterator.h"
#include "base/strings/utf_string_conversions.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace i18n {
// This test string contains 4 characters:
// x
// u with circumflex - 2 bytes in UTF8, 1 codeword in UTF16
// math double-struck A - 4 bytes in UTF8, 2 codewords in UTF16
// z
static const char* const kTestString = "x\u00FB\U0001D538z";
TEST(CharIteratorsTest, TestUTF8) {
std::string empty;
UTF8CharIterator empty_iter(empty);
EXPECT_TRUE(empty_iter.end());
EXPECT_EQ(0u, empty_iter.array_pos());
EXPECT_EQ(0u, empty_iter.char_pos());
EXPECT_FALSE(empty_iter.Advance());
std::string str("s\303\273r"); // [u with circumflex]
UTF8CharIterator iter(str);
EXPECT_FALSE(iter.end());
EXPECT_EQ(0u, iter.array_pos());
EXPECT_EQ(0u, iter.char_pos());
EXPECT_EQ('s', iter.get());
EXPECT_TRUE(iter.Advance());
EXPECT_FALSE(iter.end());
EXPECT_EQ(1u, iter.array_pos());
EXPECT_EQ(1u, iter.char_pos());
EXPECT_EQ(251, iter.get());
EXPECT_TRUE(iter.Advance());
EXPECT_FALSE(iter.end());
EXPECT_EQ(3u, iter.array_pos());
EXPECT_EQ(2u, iter.char_pos());
EXPECT_EQ('r', iter.get());
EXPECT_TRUE(iter.Advance());
EXPECT_TRUE(iter.end());
EXPECT_EQ(4u, iter.array_pos());
EXPECT_EQ(3u, iter.char_pos());
// Don't care what it returns, but this shouldn't crash
iter.get();
EXPECT_FALSE(iter.Advance());
}
TEST(CharIteratorsTest, TestUTF16_Empty) {
std::u16string empty;
UTF16CharIterator empty_iter(empty);
EXPECT_TRUE(empty_iter.end());
EXPECT_TRUE(empty_iter.start());
EXPECT_EQ(0u, empty_iter.array_pos());
EXPECT_EQ(0, empty_iter.char_offset());
EXPECT_FALSE(empty_iter.Advance());
// These shouldn't crash.
empty_iter.get();
empty_iter.NextCodePoint();
empty_iter.PreviousCodePoint();
}
TEST(CharIteratorsTest, TestUTF16) {
std::u16string str = UTF8ToUTF16(kTestString);
UTF16CharIterator iter(str);
EXPECT_FALSE(iter.end());
EXPECT_TRUE(iter.start());
EXPECT_EQ(0u, iter.array_pos());
EXPECT_EQ(0, iter.char_offset());
EXPECT_EQ('x', iter.get());
// This shouldn't crash.
iter.PreviousCodePoint();
EXPECT_EQ(0xFB, iter.NextCodePoint());
EXPECT_TRUE(iter.Advance());
EXPECT_FALSE(iter.end());
EXPECT_FALSE(iter.start());
EXPECT_EQ(1u, iter.array_pos());
EXPECT_EQ(1, iter.char_offset());
EXPECT_EQ(0xFB, iter.get());
EXPECT_EQ('x', iter.PreviousCodePoint());
EXPECT_EQ(0x1D538, iter.NextCodePoint());
EXPECT_TRUE(iter.Advance());
EXPECT_FALSE(iter.end());
EXPECT_FALSE(iter.start());
EXPECT_EQ(2u, iter.array_pos());
EXPECT_EQ(2, iter.char_offset());
EXPECT_EQ(0x1D538, iter.get());
EXPECT_EQ(0xFB, iter.PreviousCodePoint());
EXPECT_EQ('z', iter.NextCodePoint());
EXPECT_TRUE(iter.Advance());
EXPECT_FALSE(iter.end());
EXPECT_FALSE(iter.start());
EXPECT_EQ(4u, iter.array_pos());
EXPECT_EQ(3, iter.char_offset());
EXPECT_EQ('z', iter.get());
EXPECT_EQ(0x1D538, iter.PreviousCodePoint());
// This shouldn't crash.
iter.NextCodePoint();
EXPECT_TRUE(iter.Advance());
EXPECT_TRUE(iter.end());
EXPECT_FALSE(iter.start());
EXPECT_EQ(5u, iter.array_pos());
EXPECT_EQ(4, iter.char_offset());
EXPECT_EQ('z', iter.PreviousCodePoint());
// Don't care what it returns, but these shouldn't crash
iter.get();
iter.NextCodePoint();
EXPECT_FALSE(iter.Advance());
}
TEST(CharIteratorsTest, TestUTF16_Rewind) {
std::u16string str = UTF8ToUTF16(kTestString);
// It is valid for the starting array index to be on the terminating null
// character; in fact, this is where end() reports true. So we'll start on the
// terminator for this test so we can check the behavior of end().
UTF16CharIterator iter = UTF16CharIterator::UpperBound(str, str.length());
EXPECT_TRUE(iter.end());
EXPECT_FALSE(iter.start());
// This is the index of the terminating null character, and the length of the
// string in char16s.
EXPECT_EQ(5u, iter.array_pos());
EXPECT_EQ(0, iter.char_offset());
EXPECT_EQ('z', iter.PreviousCodePoint());
// Don't care what it returns, but these shouldn't crash
iter.get();
iter.NextCodePoint();
EXPECT_TRUE(iter.Rewind());
EXPECT_FALSE(iter.end());
EXPECT_FALSE(iter.start());
EXPECT_EQ(4u, iter.array_pos());
EXPECT_EQ(-1, iter.char_offset());
EXPECT_EQ('z', iter.get());
EXPECT_EQ(0x1D538, iter.PreviousCodePoint());
// This shouldn't crash.
iter.NextCodePoint();
EXPECT_TRUE(iter.Rewind());
EXPECT_FALSE(iter.end());
EXPECT_FALSE(iter.start());
EXPECT_EQ(2u, iter.array_pos());
EXPECT_EQ(-2, iter.char_offset());
EXPECT_EQ(0x1D538, iter.get());
EXPECT_EQ(0xFB, iter.PreviousCodePoint());
EXPECT_EQ('z', iter.NextCodePoint());
EXPECT_TRUE(iter.Rewind());
EXPECT_FALSE(iter.end());
EXPECT_FALSE(iter.start());
EXPECT_EQ(1u, iter.array_pos());
EXPECT_EQ(-3, iter.char_offset());
EXPECT_EQ(0xFB, iter.get());
EXPECT_EQ('x', iter.PreviousCodePoint());
EXPECT_EQ(0x1D538, iter.NextCodePoint());
EXPECT_TRUE(iter.Rewind());
EXPECT_FALSE(iter.end());
EXPECT_TRUE(iter.start());
EXPECT_EQ(0u, iter.array_pos());
EXPECT_EQ(-4, iter.char_offset());
EXPECT_EQ('x', iter.get());
EXPECT_EQ(0xFB, iter.NextCodePoint());
// This shouldn't crash.
iter.PreviousCodePoint();
EXPECT_FALSE(iter.Rewind());
}
TEST(CharIteratorsTest, TestUTF16_UpperBound) {
std::u16string str = UTF8ToUTF16(kTestString);
ASSERT_EQ(0u, UTF16CharIterator::UpperBound(str, 0).array_pos());
ASSERT_EQ(1u, UTF16CharIterator::UpperBound(str, 1).array_pos());
ASSERT_EQ(2u, UTF16CharIterator::UpperBound(str, 2).array_pos());
ASSERT_EQ(4u, UTF16CharIterator::UpperBound(str, 3).array_pos());
ASSERT_EQ(4u, UTF16CharIterator::UpperBound(str, 4).array_pos());
ASSERT_EQ(5u, UTF16CharIterator::UpperBound(str, 5).array_pos());
}
TEST(CharIteratorsTest, TestUTF16_LowerBound) {
std::u16string str = UTF8ToUTF16(kTestString);
ASSERT_EQ(0u, UTF16CharIterator::LowerBound(str, 0).array_pos());
ASSERT_EQ(1u, UTF16CharIterator::LowerBound(str, 1).array_pos());
ASSERT_EQ(2u, UTF16CharIterator::LowerBound(str, 2).array_pos());
ASSERT_EQ(2u, UTF16CharIterator::LowerBound(str, 3).array_pos());
ASSERT_EQ(4u, UTF16CharIterator::LowerBound(str, 4).array_pos());
ASSERT_EQ(5u, UTF16CharIterator::LowerBound(str, 5).array_pos());
}
} // namespace i18n
} // namespace base
|
