1 // Copyright 2020 The Abseil Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <string>
16
17 #include "gmock/gmock.h"
18 #include "gtest/gtest.h"
19 #include "absl/strings/str_format.h"
20
21 namespace absl {
22 ABSL_NAMESPACE_BEGIN
23 namespace str_format_internal {
24 namespace {
25
ConvToString(FormatConversionCharSet conv)26 std::string ConvToString(FormatConversionCharSet conv) {
27 std::string out;
28 #define CONV_SET_CASE(c) \
29 if (Contains(conv, FormatConversionCharSetInternal::c)) { \
30 out += #c; \
31 }
32 ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(CONV_SET_CASE, )
33 #undef CONV_SET_CASE
34 if (Contains(conv, FormatConversionCharSetInternal::kStar)) {
35 out += "*";
36 }
37 return out;
38 }
39
TEST(StrFormatChecker,ArgumentToConv)40 TEST(StrFormatChecker, ArgumentToConv) {
41 FormatConversionCharSet conv = ArgumentToConv<std::string>();
42 EXPECT_EQ(ConvToString(conv), "s");
43
44 conv = ArgumentToConv<const char*>();
45 EXPECT_EQ(ConvToString(conv), "sp");
46
47 conv = ArgumentToConv<double>();
48 EXPECT_EQ(ConvToString(conv), "fFeEgGaA");
49
50 conv = ArgumentToConv<int>();
51 EXPECT_EQ(ConvToString(conv), "cdiouxXfFeEgGaA*");
52
53 conv = ArgumentToConv<std::string*>();
54 EXPECT_EQ(ConvToString(conv), "p");
55 }
56
57 #ifdef ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
58
59 struct Case {
60 bool result;
61 const char* format;
62 };
63
64 template <typename... Args>
ValidFormat(const char * format)65 constexpr Case ValidFormat(const char* format) {
66 return {ValidFormatImpl<ArgumentToConv<Args>()...>(format), format};
67 }
68
TEST(StrFormatChecker,ValidFormat)69 TEST(StrFormatChecker, ValidFormat) {
70 // We want to make sure these expressions are constexpr and they have the
71 // expected value.
72 // If they are not constexpr the attribute will just ignore them and not give
73 // a compile time error.
74 enum e {};
75 enum class e2 {};
76 constexpr Case trues[] = {
77 ValidFormat<>("abc"), //
78
79 ValidFormat<e>("%d"), //
80 ValidFormat<e2>("%d"), //
81 ValidFormat<int>("%% %d"), //
82 ValidFormat<int>("%ld"), //
83 ValidFormat<int>("%lld"), //
84 ValidFormat<std::string>("%s"), //
85 ValidFormat<std::string>("%10s"), //
86 ValidFormat<int>("%.10x"), //
87 ValidFormat<int, int>("%*.3x"), //
88 ValidFormat<int>("%1.d"), //
89 ValidFormat<int>("%.d"), //
90 ValidFormat<int, double>("%d %g"), //
91 ValidFormat<int, std::string>("%*s"), //
92 ValidFormat<int, double>("%.*f"), //
93 ValidFormat<void (*)(), volatile int*>("%p %p"), //
94 ValidFormat<string_view, const char*, double, void*>(
95 "string_view=%s const char*=%s double=%f void*=%p)"),
96
97 ValidFormat<int>("%% %1$d"), //
98 ValidFormat<int>("%1$ld"), //
99 ValidFormat<int>("%1$lld"), //
100 ValidFormat<std::string>("%1$s"), //
101 ValidFormat<std::string>("%1$10s"), //
102 ValidFormat<int>("%1$.10x"), //
103 ValidFormat<int>("%1$*1$.*1$d"), //
104 ValidFormat<int, int>("%1$*2$.3x"), //
105 ValidFormat<int>("%1$1.d"), //
106 ValidFormat<int>("%1$.d"), //
107 ValidFormat<double, int>("%2$d %1$g"), //
108 ValidFormat<int, std::string>("%2$*1$s"), //
109 ValidFormat<int, double>("%2$.*1$f"), //
110 ValidFormat<void*, string_view, const char*, double>(
111 "string_view=%2$s const char*=%3$s double=%4$f void*=%1$p "
112 "repeat=%3$s)")};
113
114 for (Case c : trues) {
115 EXPECT_TRUE(c.result) << c.format;
116 }
117
118 constexpr Case falses[] = {
119 ValidFormat<int>(""), //
120
121 ValidFormat<e>("%s"), //
122 ValidFormat<e2>("%s"), //
123 ValidFormat<>("%s"), //
124 ValidFormat<>("%r"), //
125 ValidFormat<int>("%s"), //
126 ValidFormat<int>("%.1.d"), //
127 ValidFormat<int>("%*1d"), //
128 ValidFormat<int>("%1-d"), //
129 ValidFormat<std::string, int>("%*s"), //
130 ValidFormat<int>("%*d"), //
131 ValidFormat<std::string>("%p"), //
132 ValidFormat<int (*)(int)>("%d"), //
133
134 ValidFormat<>("%3$d"), //
135 ValidFormat<>("%1$r"), //
136 ValidFormat<int>("%1$s"), //
137 ValidFormat<int>("%1$.1.d"), //
138 ValidFormat<int>("%1$*2$1d"), //
139 ValidFormat<int>("%1$1-d"), //
140 ValidFormat<std::string, int>("%2$*1$s"), //
141 ValidFormat<std::string>("%1$p"),
142
143 ValidFormat<int, int>("%d %2$d"), //
144 };
145
146 for (Case c : falses) {
147 EXPECT_FALSE(c.result) << c.format;
148 }
149 }
150
TEST(StrFormatChecker,LongFormat)151 TEST(StrFormatChecker, LongFormat) {
152 #define CHARS_X_40 "1234567890123456789012345678901234567890"
153 #define CHARS_X_400 \
154 CHARS_X_40 CHARS_X_40 CHARS_X_40 CHARS_X_40 CHARS_X_40 CHARS_X_40 CHARS_X_40 \
155 CHARS_X_40 CHARS_X_40 CHARS_X_40
156 #define CHARS_X_4000 \
157 CHARS_X_400 CHARS_X_400 CHARS_X_400 CHARS_X_400 CHARS_X_400 CHARS_X_400 \
158 CHARS_X_400 CHARS_X_400 CHARS_X_400 CHARS_X_400
159 constexpr char long_format[] =
160 CHARS_X_4000 "%d" CHARS_X_4000 "%s" CHARS_X_4000;
161 constexpr bool is_valid = ValidFormat<int, std::string>(long_format).result;
162 EXPECT_TRUE(is_valid);
163 }
164
165 #endif // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
166
167 } // namespace
168 } // namespace str_format_internal
169 ABSL_NAMESPACE_END
170 } // namespace absl
171