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annotate dep/fmt/test/ostream-test.cc @ 343:1faa72660932

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*: transfer back to cmake from autotools autotools just made lots of things more complicated than they should have and many things broke (i.e. translations)
author Paper <paper@paper.us.eu.org>
date Thu, 20 Jun 2024 05:56:06 -0400
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343
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Paper <paper@paper.us.eu.org>
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1 // Formatting library for C++ - std::ostream support tests
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2 //
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3 // Copyright (c) 2012 - present, Victor Zverovich
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4 // All rights reserved.
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5 //
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6 // For the license information refer to format.h.
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7
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8 #include <fstream>
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9
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10 #include "fmt/format.h"
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11
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12 using fmt::runtime;
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13
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14 struct test {};
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15
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16 // Test that there is no issues with specializations when fmt/ostream.h is
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17 // included after fmt/format.h.
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18 namespace fmt {
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19 template <> struct formatter<test> : formatter<int> {
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20 auto format(const test&, format_context& ctx) const -> decltype(ctx.out()) {
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21 return formatter<int>::format(42, ctx);
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22 }
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23 };
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24 } // namespace fmt
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25
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26 #include <sstream>
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27
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28 #include "fmt/compile.h"
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29 #include "fmt/ostream.h"
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30 #include "fmt/ranges.h"
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31 #include "gmock/gmock.h"
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32 #include "gtest-extra.h"
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33 #include "util.h"
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34
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35 auto operator<<(std::ostream& os, const date& d) -> std::ostream& {
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36 os << d.year() << '-' << d.month() << '-' << d.day();
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37 return os;
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38 }
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39
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40 auto operator<<(std::wostream& os, const date& d) -> std::wostream& {
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41 os << d.year() << L'-' << d.month() << L'-' << d.day();
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42 return os;
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43 }
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44
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45 // Make sure that overloaded comma operators do no harm to is_streamable.
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46 struct type_with_comma_op {};
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47 template <typename T> void operator,(type_with_comma_op, const T&);
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48 template <typename T> type_with_comma_op operator<<(T&, const date&);
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49
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50 enum streamable_enum {};
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51
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52 auto operator<<(std::ostream& os, streamable_enum) -> std::ostream& {
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53 return os << "streamable_enum";
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54 }
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55
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56 enum unstreamable_enum {};
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57 auto format_as(unstreamable_enum e) -> int { return e; }
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58
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59 struct empty_test {};
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60 auto operator<<(std::ostream& os, empty_test) -> std::ostream& {
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61 return os << "";
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62 }
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63
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64 namespace fmt {
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65 template <> struct formatter<test_string> : ostream_formatter {};
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66 template <> struct formatter<date> : ostream_formatter {};
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67 template <> struct formatter<streamable_enum> : ostream_formatter {};
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68 template <> struct formatter<empty_test> : ostream_formatter {};
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69 } // namespace fmt
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70
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71 TEST(ostream_test, enum) {
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72 EXPECT_EQ("streamable_enum", fmt::format("{}", streamable_enum()));
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73 EXPECT_EQ("0", fmt::format("{}", unstreamable_enum()));
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74 }
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75
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76 TEST(ostream_test, format) {
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77 EXPECT_EQ("a string", fmt::format("{0}", test_string("a string")));
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78 EXPECT_EQ("The date is 2012-12-9",
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79 fmt::format("The date is {0}", date(2012, 12, 9)));
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80 }
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81
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82 TEST(ostream_test, format_specs) {
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83 using fmt::format_error;
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84 EXPECT_EQ("def ", fmt::format("{0:<5}", test_string("def")));
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85 EXPECT_EQ(" def", fmt::format("{0:>5}", test_string("def")));
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86 EXPECT_EQ(" def ", fmt::format("{0:^5}", test_string("def")));
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87 EXPECT_EQ("def**", fmt::format("{0:*<5}", test_string("def")));
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88 EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), test_string()),
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89 format_error, "invalid format specifier");
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90 EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), test_string()),
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91 format_error, "invalid format specifier");
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92 EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), test_string()),
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93 format_error, "invalid format specifier");
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94 EXPECT_THROW_MSG((void)fmt::format(runtime("{0:#}"), test_string()),
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95 format_error, "invalid format specifier");
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96 EXPECT_THROW_MSG((void)fmt::format(runtime("{0:05}"), test_string()),
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97 format_error, "format specifier requires numeric argument");
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98 EXPECT_EQ("test ", fmt::format("{0:13}", test_string("test")));
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99 EXPECT_EQ("test ", fmt::format("{0:{1}}", test_string("test"), 13));
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100 EXPECT_EQ("te", fmt::format("{0:.2}", test_string("test")));
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101 EXPECT_EQ("te", fmt::format("{0:.{1}}", test_string("test"), 2));
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102 }
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103
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104 TEST(ostream_test, empty_custom_output) {
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105 EXPECT_EQ("", fmt::format("{}", empty_test()));
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106 }
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107
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108 TEST(ostream_test, print) {
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109 {
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110 std::ostringstream os;
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111 fmt::print(os, "Don't {}!", "panic");
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112 EXPECT_EQ("Don't panic!", os.str());
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113 }
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114
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115 {
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116 std::ostringstream os;
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117 fmt::println(os, "Don't {}!", "panic");
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118 EXPECT_EQ("Don't panic!\n", os.str());
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119 }
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120 }
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121
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122 TEST(ostream_test, write_to_ostream) {
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123 std::ostringstream os;
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124 fmt::memory_buffer buffer;
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125 const char* foo = "foo";
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126 buffer.append(foo, foo + std::strlen(foo));
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127 fmt::detail::write_buffer(os, buffer);
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128 EXPECT_EQ("foo", os.str());
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129 }
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130
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131 TEST(ostream_test, write_to_ostream_max_size) {
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132 auto max_size = fmt::detail::max_value<size_t>();
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133 auto max_streamsize = fmt::detail::max_value<std::streamsize>();
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134 if (max_size <= fmt::detail::to_unsigned(max_streamsize)) return;
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135
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136 struct test_buffer final : fmt::detail::buffer<char> {
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137 explicit test_buffer(size_t size)
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138 : fmt::detail::buffer<char>(nullptr, size, size) {}
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139 void grow(size_t) override {}
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140 } buffer(max_size);
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141
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142 struct mock_streambuf : std::streambuf {
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143 MOCK_METHOD(std::streamsize, xsputn, (const void*, std::streamsize));
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144 auto xsputn(const char* s, std::streamsize n) -> std::streamsize override {
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145 const void* v = s;
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146 return xsputn(v, n);
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147 }
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Paper <paper@paper.us.eu.org>
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148 } streambuf;
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149
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Paper <paper@paper.us.eu.org>
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150 struct test_ostream : std::ostream {
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
151 explicit test_ostream(mock_streambuf& output_buffer)
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Paper <paper@paper.us.eu.org>
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152 : std::ostream(&output_buffer) {}
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Paper <paper@paper.us.eu.org>
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153 } os(streambuf);
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parents:
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154
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Paper <paper@paper.us.eu.org>
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155 testing::InSequence sequence;
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Paper <paper@paper.us.eu.org>
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diff changeset
156 const char* data = nullptr;
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157 using ustreamsize = std::make_unsigned<std::streamsize>::type;
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diff changeset
158 ustreamsize size = max_size;
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Paper <paper@paper.us.eu.org>
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159 do {
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160 auto n = std::min(size, fmt::detail::to_unsigned(max_streamsize));
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161 EXPECT_CALL(streambuf, xsputn(data, static_cast<std::streamsize>(n)))
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162 .WillOnce(testing::Return(max_streamsize));
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Paper <paper@paper.us.eu.org>
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163 data += n;
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Paper <paper@paper.us.eu.org>
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164 size -= n;
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Paper <paper@paper.us.eu.org>
parents:
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165 } while (size != 0);
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Paper <paper@paper.us.eu.org>
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166 fmt::detail::write_buffer(os, buffer);
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Paper <paper@paper.us.eu.org>
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167 }
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168
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Paper <paper@paper.us.eu.org>
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169 TEST(ostream_test, join) {
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170 int v[3] = {1, 2, 3};
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171 EXPECT_EQ("1, 2, 3", fmt::format("{}", fmt::join(v, v + 3, ", ")));
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172 }
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173
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174 TEST(ostream_test, join_fallback_formatter) {
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175 auto strs = std::vector<test_string>{test_string("foo"), test_string("bar")};
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176 EXPECT_EQ("foo, bar", fmt::format("{}", fmt::join(strs, ", ")));
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177 }
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178
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179 #if FMT_USE_CONSTEXPR
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180 TEST(ostream_test, constexpr_string) {
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181 EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), std::string("42")));
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182 EXPECT_EQ("a string",
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183 fmt::format(FMT_STRING("{0}"), test_string("a string")));
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184 }
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185 #endif
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186
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187 namespace fmt_test {
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188 struct abc {};
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189
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190 template <typename Output> auto operator<<(Output& out, abc) -> Output& {
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191 return out << "abc";
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192 }
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193 } // namespace fmt_test
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194
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195 template <typename T> struct test_template {};
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diff changeset
196
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Paper <paper@paper.us.eu.org>
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diff changeset
197 template <typename T>
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198 auto operator<<(std::ostream& os, test_template<T>) -> std::ostream& {
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199 return os << 1;
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Paper <paper@paper.us.eu.org>
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200 }
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201
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Paper <paper@paper.us.eu.org>
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202 namespace fmt {
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parents:
diff changeset
203 template <typename T> struct formatter<test_template<T>> : formatter<int> {
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204 auto format(test_template<T>, format_context& ctx) -> decltype(ctx.out()) {
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205 return formatter<int>::format(2, ctx);
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Paper <paper@paper.us.eu.org>
parents:
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206 }
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
207 };
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Paper <paper@paper.us.eu.org>
parents:
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208
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
209 template <> struct formatter<fmt_test::abc> : ostream_formatter {};
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Paper <paper@paper.us.eu.org>
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210 } // namespace fmt
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211
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Paper <paper@paper.us.eu.org>
parents:
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212 TEST(ostream_test, template) {
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213 EXPECT_EQ("2", fmt::format("{}", test_template<int>()));
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Paper <paper@paper.us.eu.org>
parents:
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214 }
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215
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Paper <paper@paper.us.eu.org>
parents:
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216 TEST(ostream_test, format_to_n) {
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
217 char buffer[4];
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Paper <paper@paper.us.eu.org>
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218 buffer[3] = 'x';
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Paper <paper@paper.us.eu.org>
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219 auto result = fmt::format_to_n(buffer, 3, "{}", fmt_test::abc());
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Paper <paper@paper.us.eu.org>
parents:
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220 EXPECT_EQ(3u, result.size);
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Paper <paper@paper.us.eu.org>
parents:
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221 EXPECT_EQ(buffer + 3, result.out);
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
222 EXPECT_EQ("abcx", fmt::string_view(buffer, 4));
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Paper <paper@paper.us.eu.org>
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diff changeset
223 result = fmt::format_to_n(buffer, 3, "x{}y", fmt_test::abc());
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Paper <paper@paper.us.eu.org>
parents:
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224 EXPECT_EQ(5u, result.size);
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
225 EXPECT_EQ(buffer + 3, result.out);
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
226 EXPECT_EQ("xabx", fmt::string_view(buffer, 4));
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Paper <paper@paper.us.eu.org>
parents:
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227 }
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Paper <paper@paper.us.eu.org>
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228
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Paper <paper@paper.us.eu.org>
parents:
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229 struct copyfmt_test {};
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Paper <paper@paper.us.eu.org>
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diff changeset
230
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
231 std::ostream& operator<<(std::ostream& os, copyfmt_test) {
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
232 std::ios ios(nullptr);
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Paper <paper@paper.us.eu.org>
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diff changeset
233 ios.copyfmt(os);
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Paper <paper@paper.us.eu.org>
parents:
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234 return os << "foo";
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Paper <paper@paper.us.eu.org>
parents:
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235 }
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
236
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Paper <paper@paper.us.eu.org>
parents:
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237 namespace fmt {
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Paper <paper@paper.us.eu.org>
parents:
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238 template <> struct formatter<copyfmt_test> : ostream_formatter {};
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Paper <paper@paper.us.eu.org>
parents:
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239 } // namespace fmt
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Paper <paper@paper.us.eu.org>
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240
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Paper <paper@paper.us.eu.org>
parents:
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241 TEST(ostream_test, copyfmt) {
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Paper <paper@paper.us.eu.org>
parents:
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242 EXPECT_EQ("foo", fmt::format("{}", copyfmt_test()));
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Paper <paper@paper.us.eu.org>
parents:
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243 }
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Paper <paper@paper.us.eu.org>
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244
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
245 TEST(ostream_test, to_string) {
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Paper <paper@paper.us.eu.org>
parents:
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246 EXPECT_EQ("abc", fmt::to_string(fmt_test::abc()));
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Paper <paper@paper.us.eu.org>
parents:
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247 }
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Paper <paper@paper.us.eu.org>
parents:
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248
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
249 TEST(ostream_test, range) {
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Paper <paper@paper.us.eu.org>
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250 auto strs = std::vector<test_string>{test_string("foo"), test_string("bar")};
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Paper <paper@paper.us.eu.org>
parents:
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251 EXPECT_EQ("[foo, bar]", fmt::format("{}", strs));
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Paper <paper@paper.us.eu.org>
parents:
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252 }
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Paper <paper@paper.us.eu.org>
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253
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Paper <paper@paper.us.eu.org>
parents:
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254 struct abstract {
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Paper <paper@paper.us.eu.org>
parents:
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255 virtual ~abstract() = default;
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Paper <paper@paper.us.eu.org>
parents:
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256 virtual void f() = 0;
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Paper <paper@paper.us.eu.org>
parents:
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257 friend auto operator<<(std::ostream& os, const abstract&) -> std::ostream& {
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Paper <paper@paper.us.eu.org>
parents:
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258 return os;
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
259 }
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
260 };
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Paper <paper@paper.us.eu.org>
parents:
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261
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Paper <paper@paper.us.eu.org>
parents:
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262 namespace fmt {
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Paper <paper@paper.us.eu.org>
parents:
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263 template <> struct formatter<abstract> : ostream_formatter {};
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Paper <paper@paper.us.eu.org>
parents:
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264 } // namespace fmt
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Paper <paper@paper.us.eu.org>
parents:
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265
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Paper <paper@paper.us.eu.org>
parents:
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266 void format_abstract_compiles(const abstract& a) {
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Paper <paper@paper.us.eu.org>
parents:
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267 fmt::format(FMT_COMPILE("{}"), a);
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Paper <paper@paper.us.eu.org>
parents:
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268 }
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parents:
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269
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Paper <paper@paper.us.eu.org>
parents:
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270 TEST(ostream_test, is_formattable) {
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Paper <paper@paper.us.eu.org>
parents:
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271 EXPECT_TRUE(fmt::is_formattable<std::string>());
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Paper <paper@paper.us.eu.org>
parents:
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272 EXPECT_TRUE(fmt::is_formattable<fmt::detail::std_string_view<char>>());
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
273 }
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Paper <paper@paper.us.eu.org>
parents:
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274
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Paper <paper@paper.us.eu.org>
parents:
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275 struct streamable_and_unformattable {};
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Paper <paper@paper.us.eu.org>
parents:
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276
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Paper <paper@paper.us.eu.org>
parents:
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277 auto operator<<(std::ostream& os, streamable_and_unformattable)
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
278 -> std::ostream& {
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
279 return os << "foo";
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Paper <paper@paper.us.eu.org>
parents:
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280 }
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Paper <paper@paper.us.eu.org>
parents:
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281
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Paper <paper@paper.us.eu.org>
parents:
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282 TEST(ostream_test, streamed) {
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
283 EXPECT_FALSE(fmt::is_formattable<streamable_and_unformattable>());
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Paper <paper@paper.us.eu.org>
parents:
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284 EXPECT_EQ(fmt::format("{}", fmt::streamed(streamable_and_unformattable())),
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Paper <paper@paper.us.eu.org>
parents:
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285 "foo");
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Paper <paper@paper.us.eu.org>
parents:
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286 }
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Paper <paper@paper.us.eu.org>
parents:
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287
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
288 TEST(ostream_test, closed_ofstream) {
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
289 std::ofstream ofs;
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
290 fmt::print(ofs, "discard");
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
291 }
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
292
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
293 struct unlocalized {};
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
294
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
295 auto operator<<(std::ostream& os, unlocalized)
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
296 -> std::ostream& {
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
297 return os << 12345;
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Paper <paper@paper.us.eu.org>
parents:
diff changeset
298 }
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Paper <paper@paper.us.eu.org>
parents:
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299
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Paper <paper@paper.us.eu.org>
parents:
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300 namespace fmt {
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301 template <> struct formatter<unlocalized> : ostream_formatter {};
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302 } // namespace fmt
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303
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304 TEST(ostream_test, unlocalized) {
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305 auto loc = get_locale("en_US.UTF-8");
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306 std::locale::global(loc);
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307 EXPECT_EQ(fmt::format(loc, "{}", unlocalized()), "12345");
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308 }