unittests/ADT/StringRefTest.cpp

   1 //===- llvm/unittest/ADT/StringRefTest.cpp - StringRef unit tests ---------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/ADT/StringRef.h"
  11 #include "llvm/ADT/Hashing.h"
  12 #include "llvm/ADT/STLExtras.h"
  13 #include "llvm/ADT/SmallVector.h"
  14 #include "llvm/ADT/StringExtras.h"
  15 #include "llvm/Support/Allocator.h"
  16 #include "llvm/Support/raw_ostream.h"
  17 #include "gtest/gtest.h"
  18 using namespace llvm;
  19
  20 namespace llvm {
  21
  22 std::ostream &operator<<(std::ostream &OS, const StringRef &S) {
  23   OS << S.str();
  24   return OS;
  25 }
  26
  27 std::ostream &operator<<(std::ostream &OS,
  28                          const std::pair<StringRef, StringRef> &P) {
  29   OS << "(" << P.first << ", " << P.second << ")";
  30   return OS;
  31 }
  32
  33 }
  34
  35 // Check that we can't accidentally assign a temporary std::string to a
  36 // StringRef. (Unfortunately we can't make use of the same thing with
  37 // constructors.)
  38 //
  39 // Disable this check under MSVC; even MSVC 2015 isn't consistent between
  40 // std::is_assignable and actually writing such an assignment.
  41 #if !defined(_MSC_VER)
  42 static_assert(
  43     !std::is_assignable<StringRef&, std::string>::value,
  44     "Assigning from prvalue std::string");
  45 static_assert(
  46     !std::is_assignable<StringRef&, std::string &&>::value,
  47     "Assigning from xvalue std::string");
  48 static_assert(
  49     std::is_assignable<StringRef&, std::string &>::value,
  50     "Assigning from lvalue std::string");
  51 static_assert(
  52     std::is_assignable<StringRef&, const char *>::value,
  53     "Assigning from prvalue C string");
  54 static_assert(
  55     std::is_assignable<StringRef&, const char * &&>::value,
  56     "Assigning from xvalue C string");
  57 static_assert(
  58     std::is_assignable<StringRef&, const char * &>::value,
  59     "Assigning from lvalue C string");
  60 #endif
  61
  62
  63 namespace {
  64 TEST(StringRefTest, Construction) {
  65   EXPECT_EQ("", StringRef());
  66   EXPECT_EQ("hello", StringRef("hello"));
  67   EXPECT_EQ("hello", StringRef("hello world", 5));
  68   EXPECT_EQ("hello", StringRef(std::string("hello")));
  69 }
  70
  71 TEST(StringRefTest, EmptyInitializerList) {
  72   StringRef S = {};
  73   EXPECT_TRUE(S.empty());
  74
  75   S = {};
  76   EXPECT_TRUE(S.empty());
  77 }
  78
  79 TEST(StringRefTest, Iteration) {
  80   StringRef S("hello");
  81   const char *p = "hello";
  82   for (const char *it = S.begin(), *ie = S.end(); it != ie; ++it, ++p)
  83     EXPECT_EQ(*it, *p);
  84 }
  85
  86 TEST(StringRefTest, StringOps) {
  87   const char *p = "hello";
  88   EXPECT_EQ(p, StringRef(p, 0).data());
  89   EXPECT_TRUE(StringRef().empty());
  90   EXPECT_EQ((size_t) 5, StringRef("hello").size());
  91   EXPECT_EQ(-1, StringRef("aab").compare("aad"));
  92   EXPECT_EQ( 0, StringRef("aab").compare("aab"));
  93   EXPECT_EQ( 1, StringRef("aab").compare("aaa"));
  94   EXPECT_EQ(-1, StringRef("aab").compare("aabb"));
  95   EXPECT_EQ( 1, StringRef("aab").compare("aa"));
  96   EXPECT_EQ( 1, StringRef("\xFF").compare("\1"));
  97
  98   EXPECT_EQ(-1, StringRef("AaB").compare_lower("aAd"));
  99   EXPECT_EQ( 0, StringRef("AaB").compare_lower("aab"));
 100   EXPECT_EQ( 1, StringRef("AaB").compare_lower("AAA"));
 101   EXPECT_EQ(-1, StringRef("AaB").compare_lower("aaBb"));
 102   EXPECT_EQ(-1, StringRef("AaB").compare_lower("bb"));
 103   EXPECT_EQ( 1, StringRef("aaBb").compare_lower("AaB"));
 104   EXPECT_EQ( 1, StringRef("bb").compare_lower("AaB"));
 105   EXPECT_EQ( 1, StringRef("AaB").compare_lower("aA"));
 106   EXPECT_EQ( 1, StringRef("\xFF").compare_lower("\1"));
 107
 108   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aad"));
 109   EXPECT_EQ( 0, StringRef("aab").compare_numeric("aab"));
 110   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aaa"));
 111   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aabb"));
 112   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aa"));
 113   EXPECT_EQ(-1, StringRef("1").compare_numeric("10"));
 114   EXPECT_EQ( 0, StringRef("10").compare_numeric("10"));
 115   EXPECT_EQ( 0, StringRef("10a").compare_numeric("10a"));
 116   EXPECT_EQ( 1, StringRef("2").compare_numeric("1"));
 117   EXPECT_EQ( 0, StringRef("llvm_v1i64_ty").compare_numeric("llvm_v1i64_ty"));
 118   EXPECT_EQ( 1, StringRef("\xFF").compare_numeric("\1"));
 119   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V1_q0"));
 120   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V16"));
 121   EXPECT_EQ(-1, StringRef("V8_q0").compare_numeric("V16"));
 122   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V8_q0"));
 123   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V8_q0"));
 124   EXPECT_EQ( 1, StringRef("V8_q0").compare_numeric("V1_q0"));
 125 }
 126
 127 TEST(StringRefTest, Operators) {
 128   EXPECT_EQ("", StringRef());
 129   EXPECT_TRUE(StringRef("aab") < StringRef("aad"));
 130   EXPECT_FALSE(StringRef("aab") < StringRef("aab"));
 131   EXPECT_TRUE(StringRef("aab") <= StringRef("aab"));
 132   EXPECT_FALSE(StringRef("aab") <= StringRef("aaa"));
 133   EXPECT_TRUE(StringRef("aad") > StringRef("aab"));
 134   EXPECT_FALSE(StringRef("aab") > StringRef("aab"));
 135   EXPECT_TRUE(StringRef("aab") >= StringRef("aab"));
 136   EXPECT_FALSE(StringRef("aaa") >= StringRef("aab"));
 137   EXPECT_EQ(StringRef("aab"), StringRef("aab"));
 138   EXPECT_FALSE(StringRef("aab") == StringRef("aac"));
 139   EXPECT_FALSE(StringRef("aab") != StringRef("aab"));
 140   EXPECT_TRUE(StringRef("aab") != StringRef("aac"));
 141   EXPECT_EQ('a', StringRef("aab")[1]);
 142 }
 143
 144 TEST(StringRefTest, Substr) {
 145   StringRef Str("hello");
 146   EXPECT_EQ("lo", Str.substr(3));
 147   EXPECT_EQ("", Str.substr(100));
 148   EXPECT_EQ("hello", Str.substr(0, 100));
 149   EXPECT_EQ("o", Str.substr(4, 10));
 150 }
 151
 152 TEST(StringRefTest, Slice) {
 153   StringRef Str("hello");
 154   EXPECT_EQ("l", Str.slice(2, 3));
 155   EXPECT_EQ("ell", Str.slice(1, 4));
 156   EXPECT_EQ("llo", Str.slice(2, 100));
 157   EXPECT_EQ("", Str.slice(2, 1));
 158   EXPECT_EQ("", Str.slice(10, 20));
 159 }
 160
 161 TEST(StringRefTest, Split) {
 162   StringRef Str("hello");
 163   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
 164             Str.split('X'));
 165   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
 166             Str.split('e'));
 167   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
 168             Str.split('h'));
 169   EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("lo")),
 170             Str.split('l'));
 171   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
 172             Str.split('o'));
 173
 174   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
 175             Str.rsplit('X'));
 176   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
 177             Str.rsplit('e'));
 178   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
 179             Str.rsplit('h'));
 180   EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
 181             Str.rsplit('l'));
 182   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
 183             Str.rsplit('o'));
 184
 185   EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("o")),
 186                     Str.rsplit("ll"));
 187   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
 188                     Str.rsplit("h"));
 189   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
 190               Str.rsplit("o"));
 191   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
 192                     Str.rsplit("::"));
 193   EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
 194                     Str.rsplit("l"));
 195 }
 196
 197 TEST(StringRefTest, Split2) {
 198   SmallVector<StringRef, 5> parts;
 199   SmallVector<StringRef, 5> expected;
 200
 201   expected.push_back("ab"); expected.push_back("c");
 202   StringRef(",ab,,c,").split(parts, ",", -1, false);
 203   EXPECT_TRUE(parts == expected);
 204
 205   expected.clear(); parts.clear();
 206   expected.push_back(""); expected.push_back("ab"); expected.push_back("");
 207   expected.push_back("c"); expected.push_back("");
 208   StringRef(",ab,,c,").split(parts, ",", -1, true);
 209   EXPECT_TRUE(parts == expected);
 210
 211   expected.clear(); parts.clear();
 212   expected.push_back("");
 213   StringRef("").split(parts, ",", -1, true);
 214   EXPECT_TRUE(parts == expected);
 215
 216   expected.clear(); parts.clear();
 217   StringRef("").split(parts, ",", -1, false);
 218   EXPECT_TRUE(parts == expected);
 219
 220   expected.clear(); parts.clear();
 221   StringRef(",").split(parts, ",", -1, false);
 222   EXPECT_TRUE(parts == expected);
 223
 224   expected.clear(); parts.clear();
 225   expected.push_back(""); expected.push_back("");
 226   StringRef(",").split(parts, ",", -1, true);
 227   EXPECT_TRUE(parts == expected);
 228
 229   expected.clear(); parts.clear();
 230   expected.push_back("a"); expected.push_back("b");
 231   StringRef("a,b").split(parts, ",", -1, true);
 232   EXPECT_TRUE(parts == expected);
 233
 234   // Test MaxSplit
 235   expected.clear(); parts.clear();
 236   expected.push_back("a,,b,c");
 237   StringRef("a,,b,c").split(parts, ",", 0, true);
 238   EXPECT_TRUE(parts == expected);
 239
 240   expected.clear(); parts.clear();
 241   expected.push_back("a,,b,c");
 242   StringRef("a,,b,c").split(parts, ",", 0, false);
 243   EXPECT_TRUE(parts == expected);
 244
 245   expected.clear(); parts.clear();
 246   expected.push_back("a"); expected.push_back(",b,c");
 247   StringRef("a,,b,c").split(parts, ",", 1, true);
 248   EXPECT_TRUE(parts == expected);
 249
 250   expected.clear(); parts.clear();
 251   expected.push_back("a"); expected.push_back(",b,c");
 252   StringRef("a,,b,c").split(parts, ",", 1, false);
 253   EXPECT_TRUE(parts == expected);
 254
 255   expected.clear(); parts.clear();
 256   expected.push_back("a"); expected.push_back(""); expected.push_back("b,c");
 257   StringRef("a,,b,c").split(parts, ",", 2, true);
 258   EXPECT_TRUE(parts == expected);
 259
 260   expected.clear(); parts.clear();
 261   expected.push_back("a"); expected.push_back("b,c");
 262   StringRef("a,,b,c").split(parts, ",", 2, false);
 263   EXPECT_TRUE(parts == expected);
 264
 265   expected.clear(); parts.clear();
 266   expected.push_back("a"); expected.push_back(""); expected.push_back("b");
 267   expected.push_back("c");
 268   StringRef("a,,b,c").split(parts, ",", 3, true);
 269   EXPECT_TRUE(parts == expected);
 270
 271   expected.clear(); parts.clear();
 272   expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
 273   StringRef("a,,b,c").split(parts, ",", 3, false);
 274   EXPECT_TRUE(parts == expected);
 275
 276   expected.clear(); parts.clear();
 277   expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
 278   StringRef("a,,b,c").split(parts, ',', 3, false);
 279   EXPECT_TRUE(parts == expected);
 280
 281   expected.clear(); parts.clear();
 282   expected.push_back("");
 283   StringRef().split(parts, ",", 0, true);
 284   EXPECT_TRUE(parts == expected);
 285
 286   expected.clear(); parts.clear();
 287   expected.push_back(StringRef());
 288   StringRef("").split(parts, ",", 0, true);
 289   EXPECT_TRUE(parts == expected);
 290
 291   expected.clear(); parts.clear();
 292   StringRef("").split(parts, ",", 0, false);
 293   EXPECT_TRUE(parts == expected);
 294   StringRef().split(parts, ",", 0, false);
 295   EXPECT_TRUE(parts == expected);
 296
 297   expected.clear(); parts.clear();
 298   expected.push_back("a");
 299   expected.push_back("");
 300   expected.push_back("b");
 301   expected.push_back("c,d");
 302   StringRef("a,,b,c,d").split(parts, ",", 3, true);
 303   EXPECT_TRUE(parts == expected);
 304
 305   expected.clear(); parts.clear();
 306   expected.push_back("");
 307   StringRef().split(parts, ',', 0, true);
 308   EXPECT_TRUE(parts == expected);
 309
 310   expected.clear(); parts.clear();
 311   expected.push_back(StringRef());
 312   StringRef("").split(parts, ',', 0, true);
 313   EXPECT_TRUE(parts == expected);
 314
 315   expected.clear(); parts.clear();
 316   StringRef("").split(parts, ',', 0, false);
 317   EXPECT_TRUE(parts == expected);
 318   StringRef().split(parts, ',', 0, false);
 319   EXPECT_TRUE(parts == expected);
 320
 321   expected.clear(); parts.clear();
 322   expected.push_back("a");
 323   expected.push_back("");
 324   expected.push_back("b");
 325   expected.push_back("c,d");
 326   StringRef("a,,b,c,d").split(parts, ',', 3, true);
 327   EXPECT_TRUE(parts == expected);
 328 }
 329
 330 TEST(StringRefTest, Trim) {
 331   StringRef Str0("hello");
 332   StringRef Str1(" hello ");
 333   StringRef Str2("  hello  ");
 334
 335   EXPECT_EQ(StringRef("hello"), Str0.rtrim());
 336   EXPECT_EQ(StringRef(" hello"), Str1.rtrim());
 337   EXPECT_EQ(StringRef("  hello"), Str2.rtrim());
 338   EXPECT_EQ(StringRef("hello"), Str0.ltrim());
 339   EXPECT_EQ(StringRef("hello "), Str1.ltrim());
 340   EXPECT_EQ(StringRef("hello  "), Str2.ltrim());
 341   EXPECT_EQ(StringRef("hello"), Str0.trim());
 342   EXPECT_EQ(StringRef("hello"), Str1.trim());
 343   EXPECT_EQ(StringRef("hello"), Str2.trim());
 344
 345   EXPECT_EQ(StringRef("ello"), Str0.trim("hhhhhhhhhhh"));
 346
 347   EXPECT_EQ(StringRef(""), StringRef("").trim());
 348   EXPECT_EQ(StringRef(""), StringRef(" ").trim());
 349   EXPECT_EQ(StringRef("\0", 1), StringRef(" \0 ", 3).trim());
 350   EXPECT_EQ(StringRef("\0\0", 2), StringRef("\0\0", 2).trim());
 351   EXPECT_EQ(StringRef("x"), StringRef("\0\0x\0\0", 5).trim('\0'));
 352 }
 353
 354 TEST(StringRefTest, StartsWith) {
 355   StringRef Str("hello");
 356   EXPECT_TRUE(Str.startswith(""));
 357   EXPECT_TRUE(Str.startswith("he"));
 358   EXPECT_FALSE(Str.startswith("helloworld"));
 359   EXPECT_FALSE(Str.startswith("hi"));
 360 }
 361
 362 TEST(StringRefTest, StartsWithLower) {
 363   StringRef Str("heLLo");
 364   EXPECT_TRUE(Str.startswith_lower(""));
 365   EXPECT_TRUE(Str.startswith_lower("he"));
 366   EXPECT_TRUE(Str.startswith_lower("hell"));
 367   EXPECT_TRUE(Str.startswith_lower("HELlo"));
 368   EXPECT_FALSE(Str.startswith_lower("helloworld"));
 369   EXPECT_FALSE(Str.startswith_lower("hi"));
 370 }
 371
 372 TEST(StringRefTest, ConsumeFront) {
 373   StringRef Str("hello");
 374   EXPECT_TRUE(Str.consume_front(""));
 375   EXPECT_EQ("hello", Str);
 376   EXPECT_TRUE(Str.consume_front("he"));
 377   EXPECT_EQ("llo", Str);
 378   EXPECT_FALSE(Str.consume_front("lloworld"));
 379   EXPECT_EQ("llo", Str);
 380   EXPECT_FALSE(Str.consume_front("lol"));
 381   EXPECT_EQ("llo", Str);
 382   EXPECT_TRUE(Str.consume_front("llo"));
 383   EXPECT_EQ("", Str);
 384   EXPECT_FALSE(Str.consume_front("o"));
 385   EXPECT_TRUE(Str.consume_front(""));
 386 }
 387
 388 TEST(StringRefTest, EndsWith) {
 389   StringRef Str("hello");
 390   EXPECT_TRUE(Str.endswith(""));
 391   EXPECT_TRUE(Str.endswith("lo"));
 392   EXPECT_FALSE(Str.endswith("helloworld"));
 393   EXPECT_FALSE(Str.endswith("worldhello"));
 394   EXPECT_FALSE(Str.endswith("so"));
 395 }
 396
 397 TEST(StringRefTest, EndsWithLower) {
 398   StringRef Str("heLLo");
 399   EXPECT_TRUE(Str.endswith_lower(""));
 400   EXPECT_TRUE(Str.endswith_lower("lo"));
 401   EXPECT_TRUE(Str.endswith_lower("LO"));
 402   EXPECT_TRUE(Str.endswith_lower("ELlo"));
 403   EXPECT_FALSE(Str.endswith_lower("helloworld"));
 404   EXPECT_FALSE(Str.endswith_lower("hi"));
 405 }
 406
 407 TEST(StringRefTest, ConsumeBack) {
 408   StringRef Str("hello");
 409   EXPECT_TRUE(Str.consume_back(""));
 410   EXPECT_EQ("hello", Str);
 411   EXPECT_TRUE(Str.consume_back("lo"));
 412   EXPECT_EQ("hel", Str);
 413   EXPECT_FALSE(Str.consume_back("helhel"));
 414   EXPECT_EQ("hel", Str);
 415   EXPECT_FALSE(Str.consume_back("hle"));
 416   EXPECT_EQ("hel", Str);
 417   EXPECT_TRUE(Str.consume_back("hel"));
 418   EXPECT_EQ("", Str);
 419   EXPECT_FALSE(Str.consume_back("h"));
 420   EXPECT_TRUE(Str.consume_back(""));
 421 }
 422
 423 TEST(StringRefTest, Find) {
 424   StringRef Str("helloHELLO");
 425   StringRef LongStr("hellx xello hell ello world foo bar hello HELLO");
 426
 427   struct {
 428     StringRef Str;
 429     char C;
 430     std::size_t From;
 431     std::size_t Pos;
 432     std::size_t LowerPos;
 433   } CharExpectations[] = {
 434       {Str, 'h', 0U, 0U, 0U},
 435       {Str, 'e', 0U, 1U, 1U},
 436       {Str, 'l', 0U, 2U, 2U},
 437       {Str, 'l', 3U, 3U, 3U},
 438       {Str, 'o', 0U, 4U, 4U},
 439       {Str, 'L', 0U, 7U, 2U},
 440       {Str, 'z', 0U, StringRef::npos, StringRef::npos},
 441   };
 442
 443   struct {
 444     StringRef Str;
 445     llvm::StringRef S;
 446     std::size_t From;
 447     std::size_t Pos;
 448     std::size_t LowerPos;
 449   } StrExpectations[] = {
 450       {Str, "helloword", 0, StringRef::npos, StringRef::npos},
 451       {Str, "hello", 0, 0U, 0U},
 452       {Str, "ello", 0, 1U, 1U},
 453       {Str, "zz", 0, StringRef::npos, StringRef::npos},
 454       {Str, "ll", 2U, 2U, 2U},
 455       {Str, "ll", 3U, StringRef::npos, 7U},
 456       {Str, "LL", 2U, 7U, 2U},
 457       {Str, "LL", 3U, 7U, 7U},
 458       {Str, "", 0U, 0U, 0U},
 459       {LongStr, "hello", 0U, 36U, 36U},
 460       {LongStr, "foo", 0U, 28U, 28U},
 461       {LongStr, "hell", 2U, 12U, 12U},
 462       {LongStr, "HELL", 2U, 42U, 12U},
 463       {LongStr, "", 0U, 0U, 0U}};
 464
 465   for (auto &E : CharExpectations) {
 466     EXPECT_EQ(E.Pos, E.Str.find(E.C, E.From));
 467     EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.C, E.From));
 468     EXPECT_EQ(E.LowerPos, E.Str.find_lower(toupper(E.C), E.From));
 469   }
 470
 471   for (auto &E : StrExpectations) {
 472     EXPECT_EQ(E.Pos, E.Str.find(E.S, E.From));
 473     EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.S, E.From));
 474     EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.S.upper(), E.From));
 475   }
 476
 477   EXPECT_EQ(3U, Str.rfind('l'));
 478   EXPECT_EQ(StringRef::npos, Str.rfind('z'));
 479   EXPECT_EQ(StringRef::npos, Str.rfind("helloworld"));
 480   EXPECT_EQ(0U, Str.rfind("hello"));
 481   EXPECT_EQ(1U, Str.rfind("ello"));
 482   EXPECT_EQ(StringRef::npos, Str.rfind("zz"));
 483
 484   EXPECT_EQ(8U, Str.rfind_lower('l'));
 485   EXPECT_EQ(8U, Str.rfind_lower('L'));
 486   EXPECT_EQ(StringRef::npos, Str.rfind_lower('z'));
 487   EXPECT_EQ(StringRef::npos, Str.rfind_lower("HELLOWORLD"));
 488   EXPECT_EQ(5U, Str.rfind("HELLO"));
 489   EXPECT_EQ(6U, Str.rfind("ELLO"));
 490   EXPECT_EQ(StringRef::npos, Str.rfind("ZZ"));
 491
 492   EXPECT_EQ(2U, Str.find_first_of('l'));
 493   EXPECT_EQ(1U, Str.find_first_of("el"));
 494   EXPECT_EQ(StringRef::npos, Str.find_first_of("xyz"));
 495
 496   Str = "hello";
 497   EXPECT_EQ(1U, Str.find_first_not_of('h'));
 498   EXPECT_EQ(4U, Str.find_first_not_of("hel"));
 499   EXPECT_EQ(StringRef::npos, Str.find_first_not_of("hello"));
 500
 501   EXPECT_EQ(3U, Str.find_last_not_of('o'));
 502   EXPECT_EQ(1U, Str.find_last_not_of("lo"));
 503   EXPECT_EQ(StringRef::npos, Str.find_last_not_of("helo"));
 504 }
 505
 506 TEST(StringRefTest, Count) {
 507   StringRef Str("hello");
 508   EXPECT_EQ(2U, Str.count('l'));
 509   EXPECT_EQ(1U, Str.count('o'));
 510   EXPECT_EQ(0U, Str.count('z'));
 511   EXPECT_EQ(0U, Str.count("helloworld"));
 512   EXPECT_EQ(1U, Str.count("hello"));
 513   EXPECT_EQ(1U, Str.count("ello"));
 514   EXPECT_EQ(0U, Str.count("zz"));
 515 }
 516
 517 TEST(StringRefTest, EditDistance) {
 518   StringRef Hello("hello");
 519   EXPECT_EQ(2U, Hello.edit_distance("hill"));
 520
 521   StringRef Industry("industry");
 522   EXPECT_EQ(6U, Industry.edit_distance("interest"));
 523
 524   StringRef Soylent("soylent green is people");
 525   EXPECT_EQ(19U, Soylent.edit_distance("people soiled our green"));
 526   EXPECT_EQ(26U, Soylent.edit_distance("people soiled our green",
 527                                       /* allow replacements = */ false));
 528   EXPECT_EQ(9U, Soylent.edit_distance("people soiled our green",
 529                                       /* allow replacements = */ true,
 530                                       /* max edit distance = */ 8));
 531   EXPECT_EQ(53U, Soylent.edit_distance("people soiled our green "
 532                                        "people soiled our green "
 533                                        "people soiled our green "));
 534 }
 535
 536 TEST(StringRefTest, Misc) {
 537   std::string Storage;
 538   raw_string_ostream OS(Storage);
 539   OS << StringRef("hello");
 540   EXPECT_EQ("hello", OS.str());
 541 }
 542
 543 TEST(StringRefTest, Hashing) {
 544   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef()));
 545   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef("")));
 546   std::string S = "hello world";
 547   hash_code H = hash_value(S);
 548   EXPECT_EQ(H, hash_value(StringRef("hello world")));
 549   EXPECT_EQ(H, hash_value(StringRef(S)));
 550   EXPECT_NE(H, hash_value(StringRef("hello worl")));
 551   EXPECT_EQ(hash_value(std::string("hello worl")),
 552             hash_value(StringRef("hello worl")));
 553   EXPECT_NE(H, hash_value(StringRef("hello world ")));
 554   EXPECT_EQ(hash_value(std::string("hello world ")),
 555             hash_value(StringRef("hello world ")));
 556   EXPECT_EQ(H, hash_value(StringRef("hello world\0")));
 557   EXPECT_NE(hash_value(std::string("ello worl")),
 558             hash_value(StringRef("hello world").slice(1, -1)));
 559 }
 560
 561 struct UnsignedPair {
 562   const char *Str;
 563   uint64_t Expected;
 564 } Unsigned[] =
 565   { {"0", 0}
 566   , {"255", 255}
 567   , {"256", 256}
 568   , {"65535", 65535}
 569   , {"65536", 65536}
 570   , {"4294967295", 4294967295ULL}
 571   , {"4294967296", 4294967296ULL}
 572   , {"18446744073709551615", 18446744073709551615ULL}
 573   , {"042", 34}
 574   , {"0x42", 66}
 575   , {"0b101010", 42}
 576   };
 577
 578 struct SignedPair {
 579   const char *Str;
 580   int64_t Expected;
 581 } Signed[] =
 582   { {"0", 0}
 583   , {"-0", 0}
 584   , {"127", 127}
 585   , {"128", 128}
 586   , {"-128", -128}
 587   , {"-129", -129}
 588   , {"32767", 32767}
 589   , {"32768", 32768}
 590   , {"-32768", -32768}
 591   , {"-32769", -32769}
 592   , {"2147483647", 2147483647LL}
 593   , {"2147483648", 2147483648LL}
 594   , {"-2147483648", -2147483648LL}
 595   , {"-2147483649", -2147483649LL}
 596   , {"-9223372036854775808", -(9223372036854775807LL) - 1}
 597   , {"042", 34}
 598   , {"0x42", 66}
 599   , {"0b101010", 42}
 600   , {"-042", -34}
 601   , {"-0x42", -66}
 602   , {"-0b101010", -42}
 603   };
 604
 605 TEST(StringRefTest, getAsInteger) {
 606   uint8_t U8;
 607   uint16_t U16;
 608   uint32_t U32;
 609   uint64_t U64;
 610
 611   for (size_t i = 0; i < array_lengthof(Unsigned); ++i) {
 612     bool U8Success = StringRef(Unsigned[i].Str).getAsInteger(0, U8);
 613     if (static_cast<uint8_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 614       ASSERT_FALSE(U8Success);
 615       EXPECT_EQ(U8, Unsigned[i].Expected);
 616     } else {
 617       ASSERT_TRUE(U8Success);
 618     }
 619     bool U16Success = StringRef(Unsigned[i].Str).getAsInteger(0, U16);
 620     if (static_cast<uint16_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 621       ASSERT_FALSE(U16Success);
 622       EXPECT_EQ(U16, Unsigned[i].Expected);
 623     } else {
 624       ASSERT_TRUE(U16Success);
 625     }
 626     bool U32Success = StringRef(Unsigned[i].Str).getAsInteger(0, U32);
 627     if (static_cast<uint32_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 628       ASSERT_FALSE(U32Success);
 629       EXPECT_EQ(U32, Unsigned[i].Expected);
 630     } else {
 631       ASSERT_TRUE(U32Success);
 632     }
 633     bool U64Success = StringRef(Unsigned[i].Str).getAsInteger(0, U64);
 634     if (static_cast<uint64_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 635       ASSERT_FALSE(U64Success);
 636       EXPECT_EQ(U64, Unsigned[i].Expected);
 637     } else {
 638       ASSERT_TRUE(U64Success);
 639     }
 640   }
 641
 642   int8_t S8;
 643   int16_t S16;
 644   int32_t S32;
 645   int64_t S64;
 646
 647   for (size_t i = 0; i < array_lengthof(Signed); ++i) {
 648     bool S8Success = StringRef(Signed[i].Str).getAsInteger(0, S8);
 649     if (static_cast<int8_t>(Signed[i].Expected) == Signed[i].Expected) {
 650       ASSERT_FALSE(S8Success);
 651       EXPECT_EQ(S8, Signed[i].Expected);
 652     } else {
 653       ASSERT_TRUE(S8Success);
 654     }
 655     bool S16Success = StringRef(Signed[i].Str).getAsInteger(0, S16);
 656     if (static_cast<int16_t>(Signed[i].Expected) == Signed[i].Expected) {
 657       ASSERT_FALSE(S16Success);
 658       EXPECT_EQ(S16, Signed[i].Expected);
 659     } else {
 660       ASSERT_TRUE(S16Success);
 661     }
 662     bool S32Success = StringRef(Signed[i].Str).getAsInteger(0, S32);
 663     if (static_cast<int32_t>(Signed[i].Expected) == Signed[i].Expected) {
 664       ASSERT_FALSE(S32Success);
 665       EXPECT_EQ(S32, Signed[i].Expected);
 666     } else {
 667       ASSERT_TRUE(S32Success);
 668     }
 669     bool S64Success = StringRef(Signed[i].Str).getAsInteger(0, S64);
 670     if (static_cast<int64_t>(Signed[i].Expected) == Signed[i].Expected) {
 671       ASSERT_FALSE(S64Success);
 672       EXPECT_EQ(S64, Signed[i].Expected);
 673     } else {
 674       ASSERT_TRUE(S64Success);
 675     }
 676   }
 677 }
 678
 679
 680 static const char* BadStrings[] = {
 681     ""                      // empty string
 682   , "18446744073709551617"  // value just over max
 683   , "123456789012345678901" // value way too large
 684   , "4t23v"                 // illegal decimal characters
 685   , "0x123W56"              // illegal hex characters
 686   , "0b2"                   // illegal bin characters
 687   , "08"                    // illegal oct characters
 688   , "0o8"                   // illegal oct characters
 689   , "-123"                  // negative unsigned value
 690   , "0x"
 691   , "0b"
 692 };
 693
 694
 695 TEST(StringRefTest, getAsUnsignedIntegerBadStrings) {
 696   unsigned long long U64;
 697   for (size_t i = 0; i < array_lengthof(BadStrings); ++i) {
 698     bool IsBadNumber = StringRef(BadStrings[i]).getAsInteger(0, U64);
 699     ASSERT_TRUE(IsBadNumber);
 700   }
 701 }
 702
 703 struct ConsumeUnsignedPair {
 704   const char *Str;
 705   uint64_t Expected;
 706   const char *Leftover;
 707 } ConsumeUnsigned[] = {
 708     {"0", 0, ""},
 709     {"255", 255, ""},
 710     {"256", 256, ""},
 711     {"65535", 65535, ""},
 712     {"65536", 65536, ""},
 713     {"4294967295", 4294967295ULL, ""},
 714     {"4294967296", 4294967296ULL, ""},
 715     {"255A376", 255, "A376"},
 716     {"18446744073709551615", 18446744073709551615ULL, ""},
 717     {"18446744073709551615ABC", 18446744073709551615ULL, "ABC"},
 718     {"042", 34, ""},
 719     {"0x42", 66, ""},
 720     {"0x42-0x34", 66, "-0x34"},
 721     {"0b101010", 42, ""},
 722     {"0429F", 042, "9F"},            // Auto-sensed octal radix, invalid digit
 723     {"0x42G12", 0x42, "G12"},        // Auto-sensed hex radix, invalid digit
 724     {"0b10101020101", 42, "20101"}}; // Auto-sensed binary radix, invalid digit.
 725
 726 struct ConsumeSignedPair {
 727   const char *Str;
 728   int64_t Expected;
 729   const char *Leftover;
 730 } ConsumeSigned[] = {
 731     {"0", 0, ""},
 732     {"-0", 0, ""},
 733     {"0-1", 0, "-1"},
 734     {"-0-1", 0, "-1"},
 735     {"127", 127, ""},
 736     {"128", 128, ""},
 737     {"127-1", 127, "-1"},
 738     {"128-1", 128, "-1"},
 739     {"-128", -128, ""},
 740     {"-129", -129, ""},
 741     {"-128-1", -128, "-1"},
 742     {"-129-1", -129, "-1"},
 743     {"32767", 32767, ""},
 744     {"32768", 32768, ""},
 745     {"32767-1", 32767, "-1"},
 746     {"32768-1", 32768, "-1"},
 747     {"-32768", -32768, ""},
 748     {"-32769", -32769, ""},
 749     {"-32768-1", -32768, "-1"},
 750     {"-32769-1", -32769, "-1"},
 751     {"2147483647", 2147483647LL, ""},
 752     {"2147483648", 2147483648LL, ""},
 753     {"2147483647-1", 2147483647LL, "-1"},
 754     {"2147483648-1", 2147483648LL, "-1"},
 755     {"-2147483648", -2147483648LL, ""},
 756     {"-2147483649", -2147483649LL, ""},
 757     {"-2147483648-1", -2147483648LL, "-1"},
 758     {"-2147483649-1", -2147483649LL, "-1"},
 759     {"-9223372036854775808", -(9223372036854775807LL) - 1, ""},
 760     {"-9223372036854775808-1", -(9223372036854775807LL) - 1, "-1"},
 761     {"042", 34, ""},
 762     {"042-1", 34, "-1"},
 763     {"0x42", 66, ""},
 764     {"0x42-1", 66, "-1"},
 765     {"0b101010", 42, ""},
 766     {"0b101010-1", 42, "-1"},
 767     {"-042", -34, ""},
 768     {"-042-1", -34, "-1"},
 769     {"-0x42", -66, ""},
 770     {"-0x42-1", -66, "-1"},
 771     {"-0b101010", -42, ""},
 772     {"-0b101010-1", -42, "-1"}};
 773
 774 TEST(StringRefTest, consumeIntegerUnsigned) {
 775   uint8_t U8;
 776   uint16_t U16;
 777   uint32_t U32;
 778   uint64_t U64;
 779
 780   for (size_t i = 0; i < array_lengthof(ConsumeUnsigned); ++i) {
 781     StringRef Str = ConsumeUnsigned[i].Str;
 782     bool U8Success = Str.consumeInteger(0, U8);
 783     if (static_cast<uint8_t>(ConsumeUnsigned[i].Expected) ==
 784         ConsumeUnsigned[i].Expected) {
 785       ASSERT_FALSE(U8Success);
 786       EXPECT_EQ(U8, ConsumeUnsigned[i].Expected);
 787       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
 788     } else {
 789       ASSERT_TRUE(U8Success);
 790     }
 791
 792     Str = ConsumeUnsigned[i].Str;
 793     bool U16Success = Str.consumeInteger(0, U16);
 794     if (static_cast<uint16_t>(ConsumeUnsigned[i].Expected) ==
 795         ConsumeUnsigned[i].Expected) {
 796       ASSERT_FALSE(U16Success);
 797       EXPECT_EQ(U16, ConsumeUnsigned[i].Expected);
 798       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
 799     } else {
 800       ASSERT_TRUE(U16Success);
 801     }
 802
 803     Str = ConsumeUnsigned[i].Str;
 804     bool U32Success = Str.consumeInteger(0, U32);
 805     if (static_cast<uint32_t>(ConsumeUnsigned[i].Expected) ==
 806         ConsumeUnsigned[i].Expected) {
 807       ASSERT_FALSE(U32Success);
 808       EXPECT_EQ(U32, ConsumeUnsigned[i].Expected);
 809       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
 810     } else {
 811       ASSERT_TRUE(U32Success);
 812     }
 813
 814     Str = ConsumeUnsigned[i].Str;
 815     bool U64Success = Str.consumeInteger(0, U64);
 816     if (static_cast<uint64_t>(ConsumeUnsigned[i].Expected) ==
 817         ConsumeUnsigned[i].Expected) {
 818       ASSERT_FALSE(U64Success);
 819       EXPECT_EQ(U64, ConsumeUnsigned[i].Expected);
 820       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
 821     } else {
 822       ASSERT_TRUE(U64Success);
 823     }
 824   }
 825 }
 826
 827 TEST(StringRefTest, consumeIntegerSigned) {
 828   int8_t S8;
 829   int16_t S16;
 830   int32_t S32;
 831   int64_t S64;
 832
 833   for (size_t i = 0; i < array_lengthof(ConsumeSigned); ++i) {
 834     StringRef Str = ConsumeSigned[i].Str;
 835     bool S8Success = Str.consumeInteger(0, S8);
 836     if (static_cast<int8_t>(ConsumeSigned[i].Expected) ==
 837         ConsumeSigned[i].Expected) {
 838       ASSERT_FALSE(S8Success);
 839       EXPECT_EQ(S8, ConsumeSigned[i].Expected);
 840       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
 841     } else {
 842       ASSERT_TRUE(S8Success);
 843     }
 844
 845     Str = ConsumeSigned[i].Str;
 846     bool S16Success = Str.consumeInteger(0, S16);
 847     if (static_cast<int16_t>(ConsumeSigned[i].Expected) ==
 848         ConsumeSigned[i].Expected) {
 849       ASSERT_FALSE(S16Success);
 850       EXPECT_EQ(S16, ConsumeSigned[i].Expected);
 851       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
 852     } else {
 853       ASSERT_TRUE(S16Success);
 854     }
 855
 856     Str = ConsumeSigned[i].Str;
 857     bool S32Success = Str.consumeInteger(0, S32);
 858     if (static_cast<int32_t>(ConsumeSigned[i].Expected) ==
 859         ConsumeSigned[i].Expected) {
 860       ASSERT_FALSE(S32Success);
 861       EXPECT_EQ(S32, ConsumeSigned[i].Expected);
 862       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
 863     } else {
 864       ASSERT_TRUE(S32Success);
 865     }
 866
 867     Str = ConsumeSigned[i].Str;
 868     bool S64Success = Str.consumeInteger(0, S64);
 869     if (static_cast<int64_t>(ConsumeSigned[i].Expected) ==
 870         ConsumeSigned[i].Expected) {
 871       ASSERT_FALSE(S64Success);
 872       EXPECT_EQ(S64, ConsumeSigned[i].Expected);
 873       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
 874     } else {
 875       ASSERT_TRUE(S64Success);
 876     }
 877   }
 878 }
 879
 880 struct GetDoubleStrings {
 881   const char *Str;
 882   bool AllowInexact;
 883   bool ShouldFail;
 884   double D;
 885 } DoubleStrings[] = {{"0", false, false, 0.0},
 886                      {"0.0", false, false, 0.0},
 887                      {"-0.0", false, false, -0.0},
 888                      {"123.45", false, true, 123.45},
 889                      {"123.45", true, false, 123.45},
 890                      {"1.8e308", true, false, std::numeric_limits<double>::infinity()},
 891                      {"1.8e308", false, true, std::numeric_limits<double>::infinity()},
 892                      {"0x0.0000000000001P-1023", false, true, 0.0},
 893                      {"0x0.0000000000001P-1023", true, false, 0.0},
 894                     };
 895
 896 TEST(StringRefTest, getAsDouble) {
 897   for (const auto &Entry : DoubleStrings) {
 898     double Result;
 899     StringRef S(Entry.Str);
 900     EXPECT_EQ(Entry.ShouldFail, S.getAsDouble(Result, Entry.AllowInexact));
 901     if (!Entry.ShouldFail) {
 902       EXPECT_EQ(Result, Entry.D);
 903     }
 904   }
 905 }
 906
 907 static const char *join_input[] = { "a", "b", "c" };
 908 static const char join_result1[] = "a";
 909 static const char join_result2[] = "a:b:c";
 910 static const char join_result3[] = "a::b::c";
 911
 912 TEST(StringRefTest, joinStrings) {
 913   std::vector<StringRef> v1;
 914   std::vector<std::string> v2;
 915   for (size_t i = 0; i < array_lengthof(join_input); ++i) {
 916     v1.push_back(join_input[i]);
 917     v2.push_back(join_input[i]);
 918   }
 919
 920   bool v1_join1 = join(v1.begin(), v1.begin() + 1, ":") == join_result1;
 921   EXPECT_TRUE(v1_join1);
 922   bool v1_join2 = join(v1.begin(), v1.end(), ":") == join_result2;
 923   EXPECT_TRUE(v1_join2);
 924   bool v1_join3 = join(v1.begin(), v1.end(), "::") == join_result3;
 925   EXPECT_TRUE(v1_join3);
 926
 927   bool v2_join1 = join(v2.begin(), v2.begin() + 1, ":") == join_result1;
 928   EXPECT_TRUE(v2_join1);
 929   bool v2_join2 = join(v2.begin(), v2.end(), ":") == join_result2;
 930   EXPECT_TRUE(v2_join2);
 931   bool v2_join3 = join(v2.begin(), v2.end(), "::") == join_result3;
 932   EXPECT_TRUE(v2_join3);
 933   v2_join3 = join(v2, "::") == join_result3;
 934   EXPECT_TRUE(v2_join3);
 935 }
 936
 937
 938 TEST(StringRefTest, AllocatorCopy) {
 939   BumpPtrAllocator Alloc;
 940   // First test empty strings.  We don't want these to allocate anything on the
 941   // allocator.
 942   StringRef StrEmpty = "";
 943   StringRef StrEmptyc = StrEmpty.copy(Alloc);
 944   EXPECT_TRUE(StrEmpty.equals(StrEmptyc));
 945   EXPECT_EQ(StrEmptyc.data(), nullptr);
 946   EXPECT_EQ(StrEmptyc.size(), 0u);
 947   EXPECT_EQ(Alloc.getTotalMemory(), 0u);
 948
 949   StringRef Str1 = "hello";
 950   StringRef Str2 = "bye";
 951   StringRef Str1c = Str1.copy(Alloc);
 952   StringRef Str2c = Str2.copy(Alloc);
 953   EXPECT_TRUE(Str1.equals(Str1c));
 954   EXPECT_NE(Str1.data(), Str1c.data());
 955   EXPECT_TRUE(Str2.equals(Str2c));
 956   EXPECT_NE(Str2.data(), Str2c.data());
 957 }
 958
 959 TEST(StringRefTest, Drop) {
 960   StringRef Test("StringRefTest::Drop");
 961
 962   StringRef Dropped = Test.drop_front(5);
 963   EXPECT_EQ(Dropped, "gRefTest::Drop");
 964
 965   Dropped = Test.drop_back(5);
 966   EXPECT_EQ(Dropped, "StringRefTest:");
 967
 968   Dropped = Test.drop_front(0);
 969   EXPECT_EQ(Dropped, Test);
 970
 971   Dropped = Test.drop_back(0);
 972   EXPECT_EQ(Dropped, Test);
 973
 974   Dropped = Test.drop_front(Test.size());
 975   EXPECT_TRUE(Dropped.empty());
 976
 977   Dropped = Test.drop_back(Test.size());
 978   EXPECT_TRUE(Dropped.empty());
 979 }
 980
 981 TEST(StringRefTest, Take) {
 982   StringRef Test("StringRefTest::Take");
 983
 984   StringRef Taken = Test.take_front(5);
 985   EXPECT_EQ(Taken, "Strin");
 986
 987   Taken = Test.take_back(5);
 988   EXPECT_EQ(Taken, ":Take");
 989
 990   Taken = Test.take_front(Test.size());
 991   EXPECT_EQ(Taken, Test);
 992
 993   Taken = Test.take_back(Test.size());
 994   EXPECT_EQ(Taken, Test);
 995
 996   Taken = Test.take_front(0);
 997   EXPECT_TRUE(Taken.empty());
 998
 999   Taken = Test.take_back(0);
1000   EXPECT_TRUE(Taken.empty());
1001 }
1002
1003 TEST(StringRefTest, FindIf) {
1004   StringRef Punct("Test.String");
1005   StringRef NoPunct("ABCDEFG");
1006   StringRef Empty;
1007
1008   auto IsPunct = [](char c) { return ::ispunct(c); };
1009   auto IsAlpha = [](char c) { return ::isalpha(c); };
1010   EXPECT_EQ(4U, Punct.find_if(IsPunct));
1011   EXPECT_EQ(StringRef::npos, NoPunct.find_if(IsPunct));
1012   EXPECT_EQ(StringRef::npos, Empty.find_if(IsPunct));
1013
1014   EXPECT_EQ(4U, Punct.find_if_not(IsAlpha));
1015   EXPECT_EQ(StringRef::npos, NoPunct.find_if_not(IsAlpha));
1016   EXPECT_EQ(StringRef::npos, Empty.find_if_not(IsAlpha));
1017 }
1018
1019 TEST(StringRefTest, TakeWhileUntil) {
1020   StringRef Test("String With 1 Number");
1021
1022   StringRef Taken = Test.take_while([](char c) { return ::isdigit(c); });
1023   EXPECT_EQ("", Taken);
1024
1025   Taken = Test.take_until([](char c) { return ::isdigit(c); });
1026   EXPECT_EQ("String With ", Taken);
1027
1028   Taken = Test.take_while([](char c) { return true; });
1029   EXPECT_EQ(Test, Taken);
1030
1031   Taken = Test.take_until([](char c) { return true; });
1032   EXPECT_EQ("", Taken);
1033
1034   Test = "";
1035   Taken = Test.take_while([](char c) { return true; });
1036   EXPECT_EQ("", Taken);
1037 }
1038
1039 TEST(StringRefTest, DropWhileUntil) {
1040   StringRef Test("String With 1 Number");
1041
1042   StringRef Taken = Test.drop_while([](char c) { return ::isdigit(c); });
1043   EXPECT_EQ(Test, Taken);
1044
1045   Taken = Test.drop_until([](char c) { return ::isdigit(c); });
1046   EXPECT_EQ("1 Number", Taken);
1047
1048   Taken = Test.drop_while([](char c) { return true; });
1049   EXPECT_EQ("", Taken);
1050
1051   Taken = Test.drop_until([](char c) { return true; });
1052   EXPECT_EQ(Test, Taken);
1053
1054   StringRef EmptyString = "";
1055   Taken = EmptyString.drop_while([](char c) { return true; });
1056   EXPECT_EQ("", Taken);
1057 }
1058
1059 TEST(StringRefTest, StringLiteral) {
1060   constexpr StringLiteral Strings[] = {"Foo", "Bar"};
1061   EXPECT_EQ(StringRef("Foo"), Strings[0]);
1062   EXPECT_EQ(StringRef("Bar"), Strings[1]);
1063 }
1064
1065 } // end anonymous namespace