llvm/unittests/Support/FormatVariadicTest.cpp

   1 //===- FormatVariadicTest.cpp - Unit tests for string formatting ----------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/Support/FormatVariadic.h"
  10 #include "llvm/Support/Error.h"
  11 #include "llvm/Support/FormatAdapters.h"
  12 #include "gtest/gtest.h"
  13
  14 using namespace llvm;
  15
  16 // Compile-time tests templates in the detail namespace.
  17 namespace {
  18 struct Format : public FormatAdapter<int> {
  19   Format(int N) : FormatAdapter<int>(std::move(N)) {}
  20   void format(raw_ostream &OS, StringRef Opt) override { OS << "Format"; }
  21 };
  22
  23 using detail::uses_format_member;
  24 using detail::uses_missing_provider;
  25
  26 static_assert(uses_format_member<Format>::value, "");
  27 static_assert(uses_format_member<Format &>::value, "");
  28 static_assert(uses_format_member<Format &&>::value, "");
  29 static_assert(uses_format_member<const Format>::value, "");
  30 static_assert(uses_format_member<const Format &>::value, "");
  31 static_assert(uses_format_member<const volatile Format>::value, "");
  32 static_assert(uses_format_member<const volatile Format &>::value, "");
  33
  34 struct NoFormat {};
  35 static_assert(uses_missing_provider<NoFormat>::value, "");
  36 }
  37
  38 TEST(FormatVariadicTest, EmptyFormatString) {
  39   auto Replacements = formatv_object_base::parseFormatString("");
  40   EXPECT_EQ(0U, Replacements.size());
  41 }
  42
  43 TEST(FormatVariadicTest, NoReplacements) {
  44   const StringRef kFormatString = "This is a test";
  45   auto Replacements = formatv_object_base::parseFormatString(kFormatString);
  46   ASSERT_EQ(1U, Replacements.size());
  47   EXPECT_EQ(kFormatString, Replacements[0].Spec);
  48   EXPECT_EQ(ReplacementType::Literal, Replacements[0].Type);
  49 }
  50
  51 TEST(FormatVariadicTest, EscapedBrace) {
  52   // {{ should be replaced with {
  53   auto Replacements = formatv_object_base::parseFormatString("{{");
  54   ASSERT_EQ(1u, Replacements.size());
  55   EXPECT_EQ("{", Replacements[0].Spec);
  56   EXPECT_EQ(ReplacementType::Literal, Replacements[0].Type);
  57
  58   // An even number N of braces should be replaced with N/2 braces.
  59   Replacements = formatv_object_base::parseFormatString("{{{{{{");
  60   ASSERT_EQ(1u, Replacements.size());
  61   EXPECT_EQ("{{{", Replacements[0].Spec);
  62   EXPECT_EQ(ReplacementType::Literal, Replacements[0].Type);
  63
  64   // } does not require doubling up.
  65   Replacements = formatv_object_base::parseFormatString("}");
  66   ASSERT_EQ(1u, Replacements.size());
  67   EXPECT_EQ("}", Replacements[0].Spec);
  68   EXPECT_EQ(ReplacementType::Literal, Replacements[0].Type);
  69
  70   // } does not require doubling up.
  71   Replacements = formatv_object_base::parseFormatString("}}}");
  72   ASSERT_EQ(1u, Replacements.size());
  73   EXPECT_EQ("}}}", Replacements[0].Spec);
  74   EXPECT_EQ(ReplacementType::Literal, Replacements[0].Type);
  75 }
  76
  77 TEST(FormatVariadicTest, ValidReplacementSequence) {
  78   // 1. Simple replacement - parameter index only
  79   auto Replacements = formatv_object_base::parseFormatString("{0}");
  80   ASSERT_EQ(1u, Replacements.size());
  81   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
  82   EXPECT_EQ(0u, Replacements[0].Index);
  83   EXPECT_EQ(0u, Replacements[0].Align);
  84   EXPECT_EQ("", Replacements[0].Options);
  85
  86   Replacements = formatv_object_base::parseFormatString("{1}");
  87   ASSERT_EQ(1u, Replacements.size());
  88   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
  89   EXPECT_EQ(1u, Replacements[0].Index);
  90   EXPECT_EQ(0u, Replacements[0].Align);
  91   EXPECT_EQ(AlignStyle::Right, Replacements[0].Where);
  92   EXPECT_EQ("", Replacements[0].Options);
  93
  94   // 2. Parameter index with right alignment
  95   Replacements = formatv_object_base::parseFormatString("{0,3}");
  96   ASSERT_EQ(1u, Replacements.size());
  97   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
  98   EXPECT_EQ(0u, Replacements[0].Index);
  99   EXPECT_EQ(3u, Replacements[0].Align);
 100   EXPECT_EQ(AlignStyle::Right, Replacements[0].Where);
 101   EXPECT_EQ("", Replacements[0].Options);
 102
 103   // 3. And left alignment
 104   Replacements = formatv_object_base::parseFormatString("{0,-3}");
 105   ASSERT_EQ(1u, Replacements.size());
 106   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 107   EXPECT_EQ(0u, Replacements[0].Index);
 108   EXPECT_EQ(3u, Replacements[0].Align);
 109   EXPECT_EQ(AlignStyle::Left, Replacements[0].Where);
 110   EXPECT_EQ("", Replacements[0].Options);
 111
 112   // 4. And center alignment
 113   Replacements = formatv_object_base::parseFormatString("{0,=3}");
 114   ASSERT_EQ(1u, Replacements.size());
 115   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 116   EXPECT_EQ(0u, Replacements[0].Index);
 117   EXPECT_EQ(3u, Replacements[0].Align);
 118   EXPECT_EQ(AlignStyle::Center, Replacements[0].Where);
 119   EXPECT_EQ("", Replacements[0].Options);
 120
 121   // 4. Parameter index with option string
 122   Replacements = formatv_object_base::parseFormatString("{0:foo}");
 123   ASSERT_EQ(1u, Replacements.size());
 124   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 125   EXPECT_EQ(0u, Replacements[0].Index);
 126   EXPECT_EQ(0u, Replacements[0].Align);
 127   EXPECT_EQ(AlignStyle::Right, Replacements[0].Where);
 128   EXPECT_EQ("foo", Replacements[0].Options);
 129
 130   // 5. Parameter index with alignment before option string
 131   Replacements = formatv_object_base::parseFormatString("{0,-3:foo}");
 132   ASSERT_EQ(1u, Replacements.size());
 133   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 134   EXPECT_EQ(0u, Replacements[0].Index);
 135   EXPECT_EQ(3u, Replacements[0].Align);
 136   EXPECT_EQ(AlignStyle::Left, Replacements[0].Where);
 137   EXPECT_EQ("foo", Replacements[0].Options);
 138
 139   // 7. Parameter indices, options, and alignment can all have whitespace.
 140   Replacements = formatv_object_base::parseFormatString("{ 0, -3 : foo }");
 141   ASSERT_EQ(1u, Replacements.size());
 142   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 143   EXPECT_EQ(0u, Replacements[0].Index);
 144   EXPECT_EQ(3u, Replacements[0].Align);
 145   EXPECT_EQ(AlignStyle::Left, Replacements[0].Where);
 146   EXPECT_EQ("foo", Replacements[0].Options);
 147
 148   // 8. Everything after the first option specifier is part of the style, even
 149   // if it contains another option specifier.
 150   Replacements = formatv_object_base::parseFormatString("{0:0:1}");
 151   ASSERT_EQ(1u, Replacements.size());
 152   EXPECT_EQ("0:0:1", Replacements[0].Spec);
 153   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 154   EXPECT_EQ(0u, Replacements[0].Index);
 155   EXPECT_EQ(0u, Replacements[0].Align);
 156   EXPECT_EQ(AlignStyle::Right, Replacements[0].Where);
 157   EXPECT_EQ("0:1", Replacements[0].Options);
 158
 159   // 9. Custom padding character
 160   Replacements = formatv_object_base::parseFormatString("{0,p+4:foo}");
 161   ASSERT_EQ(1u, Replacements.size());
 162   EXPECT_EQ("0,p+4:foo", Replacements[0].Spec);
 163   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 164   EXPECT_EQ(0u, Replacements[0].Index);
 165   EXPECT_EQ(4u, Replacements[0].Align);
 166   EXPECT_EQ(AlignStyle::Right, Replacements[0].Where);
 167   EXPECT_EQ('p', Replacements[0].Pad);
 168   EXPECT_EQ("foo", Replacements[0].Options);
 169
 170   // Format string special characters are allowed as padding character
 171   Replacements = formatv_object_base::parseFormatString("{0,-+4:foo}");
 172   ASSERT_EQ(1u, Replacements.size());
 173   EXPECT_EQ("0,-+4:foo", Replacements[0].Spec);
 174   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 175   EXPECT_EQ(0u, Replacements[0].Index);
 176   EXPECT_EQ(4u, Replacements[0].Align);
 177   EXPECT_EQ(AlignStyle::Right, Replacements[0].Where);
 178   EXPECT_EQ('-', Replacements[0].Pad);
 179   EXPECT_EQ("foo", Replacements[0].Options);
 180
 181   Replacements = formatv_object_base::parseFormatString("{0,+-4:foo}");
 182   ASSERT_EQ(1u, Replacements.size());
 183   EXPECT_EQ("0,+-4:foo", Replacements[0].Spec);
 184   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 185   EXPECT_EQ(0u, Replacements[0].Index);
 186   EXPECT_EQ(4u, Replacements[0].Align);
 187   EXPECT_EQ(AlignStyle::Left, Replacements[0].Where);
 188   EXPECT_EQ('+', Replacements[0].Pad);
 189   EXPECT_EQ("foo", Replacements[0].Options);
 190
 191   Replacements = formatv_object_base::parseFormatString("{0,==4:foo}");
 192   ASSERT_EQ(1u, Replacements.size());
 193   EXPECT_EQ("0,==4:foo", Replacements[0].Spec);
 194   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 195   EXPECT_EQ(0u, Replacements[0].Index);
 196   EXPECT_EQ(4u, Replacements[0].Align);
 197   EXPECT_EQ(AlignStyle::Center, Replacements[0].Where);
 198   EXPECT_EQ('=', Replacements[0].Pad);
 199   EXPECT_EQ("foo", Replacements[0].Options);
 200
 201   Replacements = formatv_object_base::parseFormatString("{0,:=4:foo}");
 202   ASSERT_EQ(1u, Replacements.size());
 203   EXPECT_EQ("0,:=4:foo", Replacements[0].Spec);
 204   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 205   EXPECT_EQ(0u, Replacements[0].Index);
 206   EXPECT_EQ(4u, Replacements[0].Align);
 207   EXPECT_EQ(AlignStyle::Center, Replacements[0].Where);
 208   EXPECT_EQ(':', Replacements[0].Pad);
 209   EXPECT_EQ("foo", Replacements[0].Options);
 210 }
 211
 212 TEST(FormatVariadicTest, DefaultReplacementValues) {
 213   // 2. If options string is missing, it defaults to empty.
 214   auto Replacements = formatv_object_base::parseFormatString("{0,3}");
 215   ASSERT_EQ(1u, Replacements.size());
 216   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 217   EXPECT_EQ(0u, Replacements[0].Index);
 218   EXPECT_EQ(3u, Replacements[0].Align);
 219   EXPECT_EQ("", Replacements[0].Options);
 220
 221   // Including if the colon is present but contains no text.
 222   Replacements = formatv_object_base::parseFormatString("{0,3:}");
 223   ASSERT_EQ(1u, Replacements.size());
 224   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 225   EXPECT_EQ(0u, Replacements[0].Index);
 226   EXPECT_EQ(3u, Replacements[0].Align);
 227   EXPECT_EQ("", Replacements[0].Options);
 228
 229   // 3. If alignment is missing, it defaults to 0, right, space
 230   Replacements = formatv_object_base::parseFormatString("{0:foo}");
 231   ASSERT_EQ(1u, Replacements.size());
 232   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 233   EXPECT_EQ(AlignStyle::Right, Replacements[0].Where);
 234   EXPECT_EQ(' ', Replacements[0].Pad);
 235   EXPECT_EQ(0u, Replacements[0].Index);
 236   EXPECT_EQ(0u, Replacements[0].Align);
 237   EXPECT_EQ("foo", Replacements[0].Options);
 238 }
 239
 240 TEST(FormatVariadicTest, MultipleReplacements) {
 241   auto Replacements =
 242       formatv_object_base::parseFormatString("{0} {1:foo}-{2,-3:bar}");
 243   ASSERT_EQ(5u, Replacements.size());
 244   // {0}
 245   EXPECT_EQ(ReplacementType::Format, Replacements[0].Type);
 246   EXPECT_EQ(0u, Replacements[0].Index);
 247   EXPECT_EQ(0u, Replacements[0].Align);
 248   EXPECT_EQ(AlignStyle::Right, Replacements[0].Where);
 249   EXPECT_EQ("", Replacements[0].Options);
 250
 251   // " "
 252   EXPECT_EQ(ReplacementType::Literal, Replacements[1].Type);
 253   EXPECT_EQ(" ", Replacements[1].Spec);
 254
 255   // {1:foo} - Options=foo
 256   EXPECT_EQ(ReplacementType::Format, Replacements[2].Type);
 257   EXPECT_EQ(1u, Replacements[2].Index);
 258   EXPECT_EQ(0u, Replacements[2].Align);
 259   EXPECT_EQ(AlignStyle::Right, Replacements[2].Where);
 260   EXPECT_EQ("foo", Replacements[2].Options);
 261
 262   // "-"
 263   EXPECT_EQ(ReplacementType::Literal, Replacements[3].Type);
 264   EXPECT_EQ("-", Replacements[3].Spec);
 265
 266   // {2:bar,-3} - Options=bar, Align=-3
 267   EXPECT_EQ(ReplacementType::Format, Replacements[4].Type);
 268   EXPECT_EQ(2u, Replacements[4].Index);
 269   EXPECT_EQ(3u, Replacements[4].Align);
 270   EXPECT_EQ(AlignStyle::Left, Replacements[4].Where);
 271   EXPECT_EQ("bar", Replacements[4].Options);
 272 }
 273
 274 TEST(FormatVariadicTest, FormatNoReplacements) {
 275   EXPECT_EQ("", formatv("").str());
 276   EXPECT_EQ("Test", formatv("Test").str());
 277 }
 278
 279 TEST(FormatVariadicTest, FormatBasicTypesOneReplacement) {
 280   EXPECT_EQ("1", formatv("{0}", 1).str());
 281   EXPECT_EQ("c", formatv("{0}", 'c').str());
 282   EXPECT_EQ("-3", formatv("{0}", -3).str());
 283   EXPECT_EQ("Test", formatv("{0}", "Test").str());
 284   EXPECT_EQ("Test2", formatv("{0}", StringRef("Test2")).str());
 285   EXPECT_EQ("Test3", formatv("{0}", std::string("Test3")).str());
 286 }
 287
 288 TEST(FormatVariadicTest, IntegralHexFormatting) {
 289   // 1. Trivial cases.  Make sure hex is not the default.
 290   EXPECT_EQ("0", formatv("{0}", 0).str());
 291   EXPECT_EQ("2748", formatv("{0}", 0xABC).str());
 292   EXPECT_EQ("-2748", formatv("{0}", -0xABC).str());
 293
 294   // 3. various hex prefixes.
 295   EXPECT_EQ("0xFF", formatv("{0:X}", 255).str());
 296   EXPECT_EQ("0xFF", formatv("{0:X+}", 255).str());
 297   EXPECT_EQ("0xff", formatv("{0:x}", 255).str());
 298   EXPECT_EQ("0xff", formatv("{0:x+}", 255).str());
 299   EXPECT_EQ("FF", formatv("{0:X-}", 255).str());
 300   EXPECT_EQ("ff", formatv("{0:x-}", 255).str());
 301
 302   // 5. Precision pads left of the most significant digit but right of the
 303   // prefix (if one exists).
 304   EXPECT_EQ("0xFF", formatv("{0:X2}", 255).str());
 305   EXPECT_EQ("0xFF", formatv("{0:X+2}", 255).str());
 306   EXPECT_EQ("0x0ff", formatv("{0:x3}", 255).str());
 307   EXPECT_EQ("0x0ff", formatv("{0:x+3}", 255).str());
 308   EXPECT_EQ("00FF", formatv("{0:X-4}", 255).str());
 309   EXPECT_EQ("00ff", formatv("{0:x-4}", 255).str());
 310
 311   // 6. Try some larger types.
 312   EXPECT_EQ("0xDEADBEEFDEADBEEF",
 313             formatv("{0:X16}", -2401053088876216593LL).str());
 314   EXPECT_EQ("0xFEEBDAEDFEEBDAED",
 315             formatv("{0:X16}", 0xFEEBDAEDFEEBDAEDULL).str());
 316   EXPECT_EQ("0x00000000DEADBEEF", formatv("{0:X16}", 0xDEADBEEF).str());
 317
 318   // 7. Padding should take into account the prefix
 319   EXPECT_EQ("0xff", formatv("{0,4:x}", 255).str());
 320   EXPECT_EQ(" 0xff", formatv("{0,5:x+}", 255).str());
 321   EXPECT_EQ("  FF", formatv("{0,4:X-}", 255).str());
 322   EXPECT_EQ("   ff", formatv("{0,5:x-}", 255).str());
 323
 324   // 8. Including when it's been zero-padded
 325   EXPECT_EQ("  0x0ff", formatv("{0,7:x3}", 255).str());
 326   EXPECT_EQ(" 0x00ff", formatv("{0,7:x+4}", 255).str());
 327   EXPECT_EQ("  000FF", formatv("{0,7:X-5}", 255).str());
 328   EXPECT_EQ(" 0000ff", formatv("{0,7:x-6}", 255).str());
 329
 330   // 9. Precision with default format specifier should work too
 331   EXPECT_EQ("    255", formatv("{0,7:3}", 255).str());
 332   EXPECT_EQ("   0255", formatv("{0,7:4}", 255).str());
 333   EXPECT_EQ("  00255", formatv("{0,7:5}", 255).str());
 334   EXPECT_EQ(" 000255", formatv("{0,7:6}", 255).str());
 335 }
 336
 337 TEST(FormatVariadicTest, PointerFormatting) {
 338   // 1. Trivial cases.  Hex is default.  Default Precision is pointer width.
 339   if (sizeof(void *) == 4) {
 340     EXPECT_EQ("0x00000000", formatv("{0}", (void *)0).str());
 341     EXPECT_EQ("0x00000ABC", formatv("{0}", (void *)0xABC).str());
 342   } else {
 343     EXPECT_EQ("0x0000000000000000", formatv("{0}", (void *)0).str());
 344     EXPECT_EQ("0x0000000000000ABC", formatv("{0}", (void *)0xABC).str());
 345   }
 346
 347   // 2. But we can reduce the precision explicitly.
 348   EXPECT_EQ("0x0", formatv("{0:0}", (void *)0).str());
 349   EXPECT_EQ("0xABC", formatv("{0:0}", (void *)0xABC).str());
 350   EXPECT_EQ("0x0000", formatv("{0:4}", (void *)0).str());
 351   EXPECT_EQ("0x0ABC", formatv("{0:4}", (void *)0xABC).str());
 352
 353   // 3. various hex prefixes.
 354   EXPECT_EQ("0x0ABC", formatv("{0:X4}", (void *)0xABC).str());
 355   EXPECT_EQ("0x0abc", formatv("{0:x4}", (void *)0xABC).str());
 356   EXPECT_EQ("0ABC", formatv("{0:X-4}", (void *)0xABC).str());
 357   EXPECT_EQ("0abc", formatv("{0:x-4}", (void *)0xABC).str());
 358 }
 359
 360 TEST(FormatVariadicTest, IntegralNumberFormatting) {
 361   // 1. Test comma grouping with default widths and precisions.
 362   EXPECT_EQ("0", formatv("{0:N}", 0).str());
 363   EXPECT_EQ("10", formatv("{0:N}", 10).str());
 364   EXPECT_EQ("100", formatv("{0:N}", 100).str());
 365   EXPECT_EQ("1,000", formatv("{0:N}", 1000).str());
 366   EXPECT_EQ("1,234,567,890", formatv("{0:N}", 1234567890).str());
 367   EXPECT_EQ("-10", formatv("{0:N}", -10).str());
 368   EXPECT_EQ("-100", formatv("{0:N}", -100).str());
 369   EXPECT_EQ("-1,000", formatv("{0:N}", -1000).str());
 370   EXPECT_EQ("-1,234,567,890", formatv("{0:N}", -1234567890).str());
 371
 372   // 2. If there is no comma, width and precision pad to the same absolute
 373   // size.
 374   EXPECT_EQ(" 1", formatv("{0,2:N}", 1).str());
 375
 376   // 3. But if there is a comma or negative sign, width factors them in but
 377   // precision doesn't.
 378   EXPECT_EQ(" 1,000", formatv("{0,6:N}", 1000).str());
 379   EXPECT_EQ(" -1,000", formatv("{0,7:N}", -1000).str());
 380
 381   // 4. Large widths all line up.
 382   EXPECT_EQ("      1,000", formatv("{0,11:N}", 1000).str());
 383   EXPECT_EQ("     -1,000", formatv("{0,11:N}", -1000).str());
 384   EXPECT_EQ("   -100,000", formatv("{0,11:N}", -100000).str());
 385 }
 386
 387 TEST(FormatVariadicTest, StringFormatting) {
 388   const char FooArray[] = "FooArray";
 389   const char *FooPtr = "FooPtr";
 390   llvm::StringRef FooRef("FooRef");
 391   constexpr StringLiteral FooLiteral("FooLiteral");
 392   std::string FooString("FooString");
 393   // 1. Test that we can print various types of strings.
 394   EXPECT_EQ(FooArray, formatv("{0}", FooArray).str());
 395   EXPECT_EQ(FooPtr, formatv("{0}", FooPtr).str());
 396   EXPECT_EQ(FooRef, formatv("{0}", FooRef).str());
 397   EXPECT_EQ(FooLiteral, formatv("{0}", FooLiteral).str());
 398   EXPECT_EQ(FooString, formatv("{0}", FooString).str());
 399
 400   // 2. Test that the precision specifier prints the correct number of
 401   // characters.
 402   EXPECT_EQ("FooA", formatv("{0:4}", FooArray).str());
 403   EXPECT_EQ("FooP", formatv("{0:4}", FooPtr).str());
 404   EXPECT_EQ("FooR", formatv("{0:4}", FooRef).str());
 405   EXPECT_EQ("FooS", formatv("{0:4}", FooString).str());
 406
 407   // 3. And that padding works.
 408   EXPECT_EQ("  FooA", formatv("{0,6:4}", FooArray).str());
 409   EXPECT_EQ("  FooP", formatv("{0,6:4}", FooPtr).str());
 410   EXPECT_EQ("  FooR", formatv("{0,6:4}", FooRef).str());
 411   EXPECT_EQ("  FooS", formatv("{0,6:4}", FooString).str());
 412 }
 413
 414 TEST(FormatVariadicTest, CharFormatting) {
 415   // 1. Not much to see here.  Just print a char with and without padding.
 416   EXPECT_EQ("C", formatv("{0}", 'C').str());
 417   EXPECT_EQ("  C", formatv("{0,3}", 'C').str());
 418
 419   // 2. char is really an integral type though, where the only difference is
 420   // that the "default" is to print the ASCII.  So if a non-default presentation
 421   // specifier exists, it should print as an integer.
 422   EXPECT_EQ("37", formatv("{0:D}", (char)37).str());
 423   EXPECT_EQ("  037", formatv("{0,5:D3}", (char)37).str());
 424 }
 425
 426 TEST(FormatVariadicTest, BoolTest) {
 427   // 1. Default style is lowercase text (same as 't')
 428   EXPECT_EQ("true", formatv("{0}", true).str());
 429   EXPECT_EQ("false", formatv("{0}", false).str());
 430   EXPECT_EQ("true", formatv("{0:t}", true).str());
 431   EXPECT_EQ("false", formatv("{0:t}", false).str());
 432
 433   // 2. T - uppercase text
 434   EXPECT_EQ("TRUE", formatv("{0:T}", true).str());
 435   EXPECT_EQ("FALSE", formatv("{0:T}", false).str());
 436
 437   // 3. D / d - integral
 438   EXPECT_EQ("1", formatv("{0:D}", true).str());
 439   EXPECT_EQ("0", formatv("{0:D}", false).str());
 440   EXPECT_EQ("1", formatv("{0:d}", true).str());
 441   EXPECT_EQ("0", formatv("{0:d}", false).str());
 442
 443   // 4. Y - uppercase yes/no
 444   EXPECT_EQ("YES", formatv("{0:Y}", true).str());
 445   EXPECT_EQ("NO", formatv("{0:Y}", false).str());
 446
 447   // 5. y - lowercase yes/no
 448   EXPECT_EQ("yes", formatv("{0:y}", true).str());
 449   EXPECT_EQ("no", formatv("{0:y}", false).str());
 450 }
 451
 452 TEST(FormatVariadicTest, DoubleFormatting) {
 453   // Test exponents, fixed point, and percent formatting.
 454
 455   // 1. Signed, unsigned, and zero exponent format.
 456   EXPECT_EQ("0.000000E+00", formatv("{0:E}", 0.0).str());
 457   EXPECT_EQ("-0.000000E+00", formatv("{0:E}", -0.0).str());
 458   EXPECT_EQ("1.100000E+00", formatv("{0:E}", 1.1).str());
 459   EXPECT_EQ("-1.100000E+00", formatv("{0:E}", -1.1).str());
 460   EXPECT_EQ("1.234568E+03", formatv("{0:E}", 1234.5678).str());
 461   EXPECT_EQ("-1.234568E+03", formatv("{0:E}", -1234.5678).str());
 462   EXPECT_EQ("1.234568E-03", formatv("{0:E}", .0012345678).str());
 463   EXPECT_EQ("-1.234568E-03", formatv("{0:E}", -.0012345678).str());
 464
 465   // 2. With padding and precision.
 466   EXPECT_EQ("  0.000E+00", formatv("{0,11:E3}", 0.0).str());
 467   EXPECT_EQ(" -1.100E+00", formatv("{0,11:E3}", -1.1).str());
 468   EXPECT_EQ("  1.235E+03", formatv("{0,11:E3}", 1234.5678).str());
 469   EXPECT_EQ(" -1.235E-03", formatv("{0,11:E3}", -.0012345678).str());
 470
 471   // 3. Signed, unsigned, and zero fixed point format.
 472   EXPECT_EQ("0.00", formatv("{0:F}", 0.0).str());
 473   EXPECT_EQ("-0.00", formatv("{0:F}", -0.0).str());
 474   EXPECT_EQ("1.10", formatv("{0:F}", 1.1).str());
 475   EXPECT_EQ("-1.10", formatv("{0:F}", -1.1).str());
 476   EXPECT_EQ("1234.57", formatv("{0:F}", 1234.5678).str());
 477   EXPECT_EQ("-1234.57", formatv("{0:F}", -1234.5678).str());
 478   EXPECT_EQ("0.00", formatv("{0:F}", .0012345678).str());
 479   EXPECT_EQ("-0.00", formatv("{0:F}", -.0012345678).str());
 480
 481   // 2. With padding and precision.
 482   EXPECT_EQ("   0.000", formatv("{0,8:F3}", 0.0).str());
 483   EXPECT_EQ("  -1.100", formatv("{0,8:F3}", -1.1).str());
 484   EXPECT_EQ("1234.568", formatv("{0,8:F3}", 1234.5678).str());
 485   EXPECT_EQ("  -0.001", formatv("{0,8:F3}", -.0012345678).str());
 486 }
 487
 488 TEST(FormatVariadicTest, CustomPaddingCharacter) {
 489   // 1. Padding with custom character
 490   EXPECT_EQ("==123", formatv("{0,=+5}", 123).str());
 491   EXPECT_EQ("=123=", formatv("{0,==5}", 123).str());
 492   EXPECT_EQ("123==", formatv("{0,=-5}", 123).str());
 493
 494   // 2. Combined with zero padding
 495   EXPECT_EQ("=00123=", formatv("{0,==7:5}", 123).str());
 496 }
 497
 498 struct format_tuple {
 499   const char *Fmt;
 500   explicit format_tuple(const char *Fmt) : Fmt(Fmt) {}
 501
 502   template <typename... Ts> auto operator()(Ts &&... Values) const {
 503     return formatv(Fmt, std::forward<Ts>(Values)...);
 504   }
 505 };
 506
 507 TEST(FormatVariadicTest, BigTest) {
 508   using Tuple =
 509       std::tuple<char, int, const char *, StringRef, std::string, double, float,
 510                  void *, int, double, int64_t, uint64_t, double, uint8_t>;
 511   Tuple Ts[] = {
 512       Tuple('a', 1, "Str", StringRef(), std::string(), 3.14159, -.17532f,
 513             (void *)nullptr, 123456, 6.02E23, -908234908423, 908234908422234,
 514             std::numeric_limits<double>::quiet_NaN(), 0xAB),
 515       Tuple('x', 0xDDB5B, "LongerStr", "StringRef", "std::string", -2.7,
 516             .08215f, (void *)nullptr, 0, 6.62E-34, -908234908423,
 517             908234908422234, std::numeric_limits<double>::infinity(), 0x0)};
 518   // Test long string formatting with many edge cases combined.
 519   const char *Intro =
 520       "There are {{{0}} items in the tuple, and {{{1}} tuple(s) in the array.";
 521   const char *Header =
 522       "{0,6}|{1,8}|{2,=10}|{3,=10}|{4,=13}|{5,7}|{6,7}|{7,10}|{8,"
 523       "-7}|{9,10}|{10,16}|{11,17}|{12,6}|{13,4}";
 524   const char *Line =
 525       "{0,6}|{1,8:X}|{2,=10}|{3,=10:5}|{4,=13}|{5,7:3}|{6,7:P2}|{7,"
 526       "10:X8}|{8,-7:N}|{9,10:E4}|{10,16:N}|{11,17:D}|{12,6}|{13,"
 527       "4:X}";
 528
 529   std::string S;
 530   llvm::raw_string_ostream Stream(S);
 531   Stream << formatv(Intro, std::tuple_size<Tuple>::value, std::size(Ts))
 532          << "\n";
 533   Stream << formatv(Header, "Char", "HexInt", "Str", "Ref", "std::str",
 534                     "double", "float", "pointer", "comma", "exp", "bigint",
 535                     "bigint2", "limit", "byte")
 536          << "\n";
 537   for (auto &Item : Ts) {
 538     Stream << std::apply(format_tuple(Line), Item) << "\n";
 539   }
 540   Stream.flush();
 541   const char *Expected =
 542       R"foo(There are {14} items in the tuple, and {2} tuple(s) in the array.
 543   Char|  HexInt|   Str    |   Ref    |  std::str   | double|  float|   pointer|comma  |       exp|          bigint|          bigint2| limit|byte
 544      a|     0x1|   Str    |          |             |  3.142|-17.53%|0x00000000|123,456|6.0200E+23|-908,234,908,423|  908234908422234|   nan|0xAB
 545      x| 0xDDB5B|LongerStr |  Strin   | std::string | -2.700|  8.21%|0x00000000|0      |6.6200E-34|-908,234,908,423|  908234908422234|   INF| 0x0
 546 )foo";
 547
 548   EXPECT_EQ(Expected, S);
 549 }
 550
 551 TEST(FormatVariadicTest, Range) {
 552   std::vector<int> IntRange = {1, 1, 2, 3, 5, 8, 13};
 553
 554   // 1. Simple range with default separator and element style.
 555   EXPECT_EQ("1, 1, 2, 3, 5, 8, 13",
 556             formatv("{0}", make_range(IntRange.begin(), IntRange.end())).str());
 557   EXPECT_EQ("1, 2, 3, 5, 8",
 558             formatv("{0}", make_range(IntRange.begin() + 1, IntRange.end() - 1))
 559                 .str());
 560
 561   // 2. Non-default separator
 562   EXPECT_EQ(
 563       "1/1/2/3/5/8/13",
 564       formatv("{0:$[/]}", make_range(IntRange.begin(), IntRange.end())).str());
 565
 566   // 3. Default separator, non-default element style.
 567   EXPECT_EQ(
 568       "0x1, 0x1, 0x2, 0x3, 0x5, 0x8, 0xd",
 569       formatv("{0:@[x]}", make_range(IntRange.begin(), IntRange.end())).str());
 570
 571   // 4. Non-default separator and element style.
 572   EXPECT_EQ(
 573       "0x1 + 0x1 + 0x2 + 0x3 + 0x5 + 0x8 + 0xd",
 574       formatv("{0:$[ + ]@[x]}", make_range(IntRange.begin(), IntRange.end()))
 575           .str());
 576
 577   // 5. Element style and/or separator using alternate delimeters to allow using
 578   // delimeter characters as part of the separator.
 579   EXPECT_EQ(
 580       "<0x1><0x1><0x2><0x3><0x5><0x8><0xd>",
 581       formatv("<{0:$[><]@(x)}>", make_range(IntRange.begin(), IntRange.end()))
 582           .str());
 583   EXPECT_EQ(
 584       "[0x1][0x1][0x2][0x3][0x5][0x8][0xd]",
 585       formatv("[{0:$(][)@[x]}]", make_range(IntRange.begin(), IntRange.end()))
 586           .str());
 587   EXPECT_EQ(
 588       "(0x1)(0x1)(0x2)(0x3)(0x5)(0x8)(0xd)",
 589       formatv("({0:$<)(>@<x>})", make_range(IntRange.begin(), IntRange.end()))
 590           .str());
 591
 592   // 5. Empty range.
 593   EXPECT_EQ("", formatv("{0:$[+]@[x]}",
 594                         make_range(IntRange.begin(), IntRange.begin()))
 595                     .str());
 596
 597   // 6. Empty separator and style.
 598   EXPECT_EQ("11235813",
 599             formatv("{0:$[]@<>}", make_range(IntRange.begin(), IntRange.end()))
 600                 .str());
 601 }
 602
 603 TEST(FormatVariadicTest, Adapter) {
 604   class Negative : public FormatAdapter<int> {
 605   public:
 606     explicit Negative(int N) : FormatAdapter<int>(std::move(N)) {}
 607     void format(raw_ostream &S, StringRef Options) override { S << -Item; }
 608   };
 609
 610   EXPECT_EQ("-7", formatv("{0}", Negative(7)).str());
 611
 612   int N = 171;
 613
 614   EXPECT_EQ("  171  ",
 615             formatv("{0}", fmt_align(N, AlignStyle::Center, 7)).str());
 616   EXPECT_EQ("--171--",
 617             formatv("{0}", fmt_align(N, AlignStyle::Center, 7, '-')).str());
 618   EXPECT_EQ(" 171   ", formatv("{0}", fmt_pad(N, 1, 3)).str());
 619   EXPECT_EQ("171171171171171", formatv("{0}", fmt_repeat(N, 5)).str());
 620
 621   EXPECT_EQ(" ABABABABAB   ",
 622             formatv("{0:X-}", fmt_pad(fmt_repeat(N, 5), 1, 3)).str());
 623   EXPECT_EQ("   AB    AB    AB    AB    AB     ",
 624             formatv("{0,=34:X-}", fmt_repeat(fmt_pad(N, 1, 3), 5)).str());
 625 }
 626
 627 TEST(FormatVariadicTest, MoveConstructor) {
 628   auto fmt = formatv("{0} {1}", 1, 2);
 629   auto fmt2 = std::move(fmt);
 630   std::string S = std::string(fmt2);
 631   EXPECT_EQ("1 2", S);
 632 }
 633 TEST(FormatVariadicTest, ImplicitConversions) {
 634   std::string S = std::string(formatv("{0} {1}", 1, 2));
 635   EXPECT_EQ("1 2", S);
 636
 637   SmallString<4> S2 = formatv("{0} {1}", 1, 2);
 638   EXPECT_EQ("1 2", S2);
 639 }
 640
 641 TEST(FormatVariadicTest, FormatAdapter) {
 642   EXPECT_EQ("Format", formatv("{0}", Format(1)).str());
 643
 644   Format var(1);
 645   EXPECT_EQ("Format", formatv("{0}", var).str());
 646   EXPECT_EQ("Format", formatv("{0}", std::move(var)).str());
 647
 648   // Not supposed to compile
 649   // const Format cvar(1);
 650   // EXPECT_EQ("Format", formatv("{0}", cvar).str());
 651 }
 652
 653 TEST(FormatVariadicTest, FormatFormatvObject) {
 654   EXPECT_EQ("Format", formatv("F{0}t", formatv("o{0}a", "rm")).str());
 655   EXPECT_EQ("[   ! ]", formatv("[{0,+5}]", formatv("{0,-2}", "!")).str());
 656 }
 657
 658 namespace {
 659 struct Recorder {
 660   int Copied = 0, Moved = 0;
 661   Recorder() = default;
 662   Recorder(const Recorder &Copy) : Copied(1 + Copy.Copied), Moved(Copy.Moved) {}
 663   Recorder(const Recorder &&Move)
 664       : Copied(Move.Copied), Moved(1 + Move.Moved) {}
 665 };
 666 } // namespace
 667 namespace llvm {
 668 template <> struct format_provider<Recorder> {
 669   static void format(const Recorder &R, raw_ostream &OS, StringRef style) {
 670     OS << R.Copied << "C " << R.Moved << "M";
 671   }
 672 };
 673 } // namespace
 674
 675 TEST(FormatVariadicTest, CopiesAndMoves) {
 676   Recorder R;
 677   EXPECT_EQ("0C 0M", formatv("{0}", R).str());
 678   EXPECT_EQ("0C 3M", formatv("{0}", std::move(R)).str());
 679   EXPECT_EQ("0C 3M", formatv("{0}", Recorder()).str());
 680   EXPECT_EQ(0, R.Copied);
 681   EXPECT_EQ(0, R.Moved);
 682 }
 683
 684 namespace adl {
 685 struct X {};
 686 raw_ostream &operator<<(raw_ostream &OS, const X &) { return OS << "X"; }
 687 } // namespace adl
 688 TEST(FormatVariadicTest, FormatStreamable) {
 689   adl::X X;
 690   EXPECT_EQ("X", formatv("{0}", X).str());
 691 }
 692
 693 TEST(FormatVariadicTest, FormatError) {
 694   auto E1 = make_error<StringError>("X", inconvertibleErrorCode());
 695   EXPECT_EQ("X", formatv("{0}", E1).str());
 696   EXPECT_TRUE(E1.isA<StringError>()); // not consumed
 697   EXPECT_EQ("X", formatv("{0}", fmt_consume(std::move(E1))).str());
 698   EXPECT_FALSE(E1.isA<StringError>()); // consumed
 699 }