1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "perfetto/ext/base/string_view.h"
18
19 #include <forward_list>
20 #include <unordered_map>
21 #include <unordered_set>
22
23 #include "test/gtest_and_gmock.h"
24
25 namespace perfetto {
26 namespace base {
27 namespace {
28
TEST(StringViewTest,BasicCases)29 TEST(StringViewTest, BasicCases) {
30 EXPECT_EQ(StringView(), StringView(""));
31 EXPECT_EQ(StringView(""), StringView(""));
32 EXPECT_EQ(StringView(""), StringView("", 0));
33 EXPECT_EQ(StringView("ab"), StringView("ab", 2));
34 EXPECT_EQ(StringView("ax", 1), StringView("ay", 1));
35 EXPECT_EQ(StringView("ax", 1), StringView("a"));
36 EXPECT_EQ(StringView("ax", 1), "a");
37 EXPECT_EQ(StringView("foo|", 3).ToStdString(), std::string("foo"));
38 EXPECT_TRUE(StringView("x") != StringView(""));
39 EXPECT_TRUE(StringView("") != StringView("y"));
40 EXPECT_TRUE(StringView("a") != StringView("b"));
41 EXPECT_EQ(StringView().size(), 0ul);
42 EXPECT_EQ(StringView().data(), nullptr);
43 EXPECT_EQ(StringView("").size(), 0ul);
44 EXPECT_NE(StringView("").data(), nullptr);
45 EXPECT_TRUE(StringView("").empty());
46 EXPECT_FALSE(StringView("x").empty());
47
48 {
49 StringView x("abc");
50 EXPECT_EQ(x.size(), 3u);
51 EXPECT_EQ(x.data()[0], 'a');
52 EXPECT_EQ(x.data()[2], 'c');
53 EXPECT_TRUE(x == "abc");
54 EXPECT_TRUE(x == StringView("abc"));
55 EXPECT_TRUE(x != StringView("abcd"));
56 EXPECT_FALSE(x == StringView("aBc"));
57 EXPECT_TRUE(x.CaseInsensitiveEq("aBc"));
58 EXPECT_TRUE(x.CaseInsensitiveEq("AbC"));
59 EXPECT_FALSE(x.CaseInsensitiveEq("AbCd"));
60 EXPECT_FALSE(x.CaseInsensitiveEq("ab"));
61 EXPECT_FALSE(x.CaseInsensitiveEq("abcd"));
62 EXPECT_FALSE(x.CaseInsensitiveEq(""));
63 }
64
65 // Test find(char).
66 EXPECT_EQ(StringView().find('x'), StringView::npos);
67 EXPECT_EQ(StringView("").find('x'), StringView::npos);
68 EXPECT_EQ(StringView("foo").find('x'), StringView::npos);
69 EXPECT_EQ(StringView("foo").find('f'), 0u);
70 EXPECT_EQ(StringView("foo").find('o'), 1u);
71
72 // Test rfind(char).
73 EXPECT_EQ(StringView().rfind('x'), StringView::npos);
74 EXPECT_EQ(StringView("").rfind('x'), StringView::npos);
75 EXPECT_EQ(StringView("foo").rfind('x'), StringView::npos);
76 EXPECT_EQ(StringView("foo").rfind('f'), 0u);
77 EXPECT_EQ(StringView("foo").rfind('o'), 2u);
78
79 // Test find(const char*).
80 EXPECT_EQ(StringView().find("x"), StringView::npos);
81 EXPECT_EQ(StringView("").find("x"), StringView::npos);
82 EXPECT_EQ(StringView("foo").find("x"), StringView::npos);
83 EXPECT_EQ(StringView("foo").find("foobar"), StringView::npos);
84 EXPECT_EQ(StringView("foo").find("f", 1), StringView::npos);
85 EXPECT_EQ(StringView("foo").find("f"), 0u);
86 EXPECT_EQ(StringView("foo").find("fo"), 0u);
87 EXPECT_EQ(StringView("foo").find("oo"), 1u);
88 EXPECT_EQ(StringView("foo").find("o"), 1u);
89 EXPECT_EQ(StringView("foo").find("o", 2), 2u);
90 EXPECT_EQ(StringView("foo").find("o", 3), StringView::npos);
91 EXPECT_EQ(StringView("foo").find("o", 10), StringView::npos);
92 EXPECT_EQ(StringView("foobar").find("bar", 3), 3u);
93 EXPECT_EQ(StringView("foobar").find("bartender"), StringView::npos);
94 EXPECT_EQ(StringView("foobar").find("bartender", 3), StringView::npos);
95 EXPECT_EQ(StringView("foo").find(""), 0u); // std::string behaves the same.
96
97 // Test substr().
98 EXPECT_EQ(StringView().substr(0, 0).ToStdString(), "");
99 EXPECT_EQ(StringView().substr(3, 1).ToStdString(), "");
100 EXPECT_EQ(StringView("foo").substr(3, 1).ToStdString(), "");
101 EXPECT_EQ(StringView("foo").substr(4, 0).ToStdString(), "");
102 EXPECT_EQ(StringView("foo").substr(4, 1).ToStdString(), "");
103 EXPECT_EQ(StringView("foo").substr(0, 1).ToStdString(), "f");
104 EXPECT_EQ(StringView("foo").substr(0, 3).ToStdString(), "foo");
105 EXPECT_EQ(StringView("foo").substr(0, 99).ToStdString(), "foo");
106 EXPECT_EQ(StringView("foo").substr(1, 2).ToStdString(), "oo");
107 EXPECT_EQ(StringView("foo").substr(1, 3).ToStdString(), "oo");
108 EXPECT_EQ(StringView("foo").substr(1, 99).ToStdString(), "oo");
109 EXPECT_EQ(StringView("xyz").substr(0).ToStdString(), "xyz");
110 EXPECT_EQ(StringView("xyz").substr(2).ToStdString(), "z");
111 EXPECT_EQ(StringView("xyz").substr(3).ToStdString(), "");
112
113 // Test the < operator.
114 EXPECT_FALSE(StringView() < StringView());
115 EXPECT_FALSE(StringView() < StringView(""));
116 EXPECT_TRUE(StringView() < StringView("foo"));
117 EXPECT_TRUE(StringView("") < StringView("foo"));
118 EXPECT_FALSE(StringView() < StringView("foo", 0));
119 EXPECT_FALSE(StringView("foo") < StringView("foo"));
120 EXPECT_TRUE(StringView("foo") < StringView("fooo"));
121 EXPECT_FALSE(StringView("fooo") < StringView("foo"));
122 EXPECT_TRUE(StringView("bar") < StringView("foo"));
123
124 // Test the <= operator.
125 EXPECT_TRUE(StringView() <= StringView());
126 EXPECT_TRUE(StringView() <= StringView(""));
127 EXPECT_TRUE(StringView() <= StringView("foo"));
128 EXPECT_TRUE(StringView("") <= StringView("foo"));
129 EXPECT_TRUE(StringView() <= StringView("foo", 0));
130 EXPECT_TRUE(StringView("foo") <= StringView("foo"));
131 EXPECT_TRUE(StringView("foo") <= StringView("fooo"));
132 EXPECT_FALSE(StringView("fooo") <= StringView("foo"));
133 EXPECT_TRUE(StringView("bar") <= StringView("foo"));
134
135 // Test the > operator.
136 EXPECT_FALSE(StringView() > StringView());
137 EXPECT_FALSE(StringView() > StringView(""));
138 EXPECT_FALSE(StringView() > StringView("foo"));
139 EXPECT_FALSE(StringView("") > StringView("foo"));
140 EXPECT_FALSE(StringView() > StringView("foo", 0));
141 EXPECT_FALSE(StringView("foo") > StringView("foo"));
142 EXPECT_FALSE(StringView("foo") > StringView("fooo"));
143 EXPECT_TRUE(StringView("fooo") > StringView("foo"));
144 EXPECT_FALSE(StringView("bar") > StringView("foo"));
145
146 // Test the >= operator.
147 EXPECT_TRUE(StringView() >= StringView());
148 EXPECT_TRUE(StringView() >= StringView(""));
149 EXPECT_FALSE(StringView() >= StringView("foo"));
150 EXPECT_FALSE(StringView("") >= StringView("foo"));
151 EXPECT_TRUE(StringView() >= StringView("foo", 0));
152 EXPECT_TRUE(StringView("foo") >= StringView("foo"));
153 EXPECT_FALSE(StringView("foo") >= StringView("fooo"));
154 EXPECT_TRUE(StringView("fooo") >= StringView("foo"));
155 EXPECT_FALSE(StringView("bar") >= StringView("foo"));
156 }
157
TEST(StringViewTest,HashCollisions)158 TEST(StringViewTest, HashCollisions) {
159 std::unordered_map<uint64_t, StringView> hashes;
160 std::unordered_set<StringView> sv_set;
161 auto insert_sv = [&hashes, &sv_set](StringView sv) {
162 hashes.emplace(sv.Hash(), sv);
163 size_t prev_set_size = sv_set.size();
164 sv_set.insert(sv);
165 ASSERT_EQ(sv_set.size(), prev_set_size + 1);
166 };
167
168 insert_sv("");
169 EXPECT_EQ(hashes.size(), 1u);
170 size_t last_size = 1;
171 std::forward_list<std::string> strings;
172 for (uint8_t c = 0; c < 0x80; c++) {
173 char buf[500];
174 memset(buf, static_cast<char>(c), sizeof(buf));
175 for (size_t i = 1; i <= sizeof(buf); i++) {
176 strings.emplace_front(buf, i);
177 StringView sv(strings.front());
178 auto other = hashes.find(sv.Hash());
179 if (other == hashes.end()) {
180 insert_sv(sv);
181 ++last_size;
182 ASSERT_EQ(hashes.size(), last_size);
183 continue;
184 }
185 EXPECT_TRUE(false) << "H(" << sv.ToStdString() << ") = "
186 << "H(" << other->second.ToStdString() << ")";
187 }
188 }
189 }
190
191 } // namespace
192 } // namespace base
193 } // namespace perfetto
194