unittests/ADT/StringRefTest.cpp

   1 //===- llvm/unittest/ADT/StringRefTest.cpp - StringRef unit tests ---------===//
   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/ADT/StringRef.h"
  10 #include "llvm/ADT/Hashing.h"
  11 #include "llvm/ADT/STLExtras.h"
  12 #include "llvm/ADT/SmallVector.h"
  13 #include "llvm/ADT/StringExtras.h"
  14 #include "llvm/Support/Allocator.h"
  15 #include "llvm/Support/raw_ostream.h"
  16 #include "gtest/gtest.h"
  17 using namespace llvm;
  18
  19 namespace llvm {
  20
  21 std::ostream &operator<<(std::ostream &OS, const StringRef &S) {
  22   OS << S.str();
  23   return OS;
  24 }
  25
  26 std::ostream &operator<<(std::ostream &OS,
  27                          const std::pair<StringRef, StringRef> &P) {
  28   OS << "(" << P.first << ", " << P.second << ")";
  29   return OS;
  30 }
  31
  32 }
  33
  34 // Check that we can't accidentally assign a temporary std::string to a
  35 // StringRef. (Unfortunately we can't make use of the same thing with
  36 // constructors.)
  37 //
  38 // Disable this check under MSVC; even MSVC 2015 isn't consistent between
  39 // std::is_assignable and actually writing such an assignment.
  40 #if !defined(_MSC_VER)
  41 static_assert(
  42     !std::is_assignable<StringRef&, std::string>::value,
  43     "Assigning from prvalue std::string");
  44 static_assert(
  45     !std::is_assignable<StringRef&, std::string &&>::value,
  46     "Assigning from xvalue std::string");
  47 static_assert(
  48     std::is_assignable<StringRef&, std::string &>::value,
  49     "Assigning from lvalue std::string");
  50 static_assert(
  51     std::is_assignable<StringRef&, const char *>::value,
  52     "Assigning from prvalue C string");
  53 static_assert(
  54     std::is_assignable<StringRef&, const char * &&>::value,
  55     "Assigning from xvalue C string");
  56 static_assert(
  57     std::is_assignable<StringRef&, const char * &>::value,
  58     "Assigning from lvalue C string");
  59 #endif
  60
  61
  62 namespace {
  63 TEST(StringRefTest, Construction) {
  64   EXPECT_EQ("", StringRef());
  65   EXPECT_EQ("hello", StringRef("hello"));
  66   EXPECT_EQ("hello", StringRef("hello world", 5));
  67   EXPECT_EQ("hello", StringRef(std::string("hello")));
  68 }
  69
  70 TEST(StringRefTest, EmptyInitializerList) {
  71   StringRef S = {};
  72   EXPECT_TRUE(S.empty());
  73
  74   S = {};
  75   EXPECT_TRUE(S.empty());
  76 }
  77
  78 TEST(StringRefTest, Iteration) {
  79   StringRef S("hello");
  80   const char *p = "hello";
  81   for (const char *it = S.begin(), *ie = S.end(); it != ie; ++it, ++p)
  82     EXPECT_EQ(*it, *p);
  83 }
  84
  85 TEST(StringRefTest, StringOps) {
  86   const char *p = "hello";
  87   EXPECT_EQ(p, StringRef(p, 0).data());
  88   EXPECT_TRUE(StringRef().empty());
  89   EXPECT_EQ((size_t) 5, StringRef("hello").size());
  90   EXPECT_EQ(-1, StringRef("aab").compare("aad"));
  91   EXPECT_EQ( 0, StringRef("aab").compare("aab"));
  92   EXPECT_EQ( 1, StringRef("aab").compare("aaa"));
  93   EXPECT_EQ(-1, StringRef("aab").compare("aabb"));
  94   EXPECT_EQ( 1, StringRef("aab").compare("aa"));
  95   EXPECT_EQ( 1, StringRef("\xFF").compare("\1"));
  96
  97   EXPECT_EQ(-1, StringRef("AaB").compare_lower("aAd"));
  98   EXPECT_EQ( 0, StringRef("AaB").compare_lower("aab"));
  99   EXPECT_EQ( 1, StringRef("AaB").compare_lower("AAA"));
 100   EXPECT_EQ(-1, StringRef("AaB").compare_lower("aaBb"));
 101   EXPECT_EQ(-1, StringRef("AaB").compare_lower("bb"));
 102   EXPECT_EQ( 1, StringRef("aaBb").compare_lower("AaB"));
 103   EXPECT_EQ( 1, StringRef("bb").compare_lower("AaB"));
 104   EXPECT_EQ( 1, StringRef("AaB").compare_lower("aA"));
 105   EXPECT_EQ( 1, StringRef("\xFF").compare_lower("\1"));
 106
 107   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aad"));
 108   EXPECT_EQ( 0, StringRef("aab").compare_numeric("aab"));
 109   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aaa"));
 110   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aabb"));
 111   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aa"));
 112   EXPECT_EQ(-1, StringRef("1").compare_numeric("10"));
 113   EXPECT_EQ( 0, StringRef("10").compare_numeric("10"));
 114   EXPECT_EQ( 0, StringRef("10a").compare_numeric("10a"));
 115   EXPECT_EQ( 1, StringRef("2").compare_numeric("1"));
 116   EXPECT_EQ( 0, StringRef("llvm_v1i64_ty").compare_numeric("llvm_v1i64_ty"));
 117   EXPECT_EQ( 1, StringRef("\xFF").compare_numeric("\1"));
 118   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V1_q0"));
 119   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V16"));
 120   EXPECT_EQ(-1, StringRef("V8_q0").compare_numeric("V16"));
 121   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V8_q0"));
 122   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V8_q0"));
 123   EXPECT_EQ( 1, StringRef("V8_q0").compare_numeric("V1_q0"));
 124 }
 125
 126 TEST(StringRefTest, Operators) {
 127   EXPECT_EQ("", StringRef());
 128   EXPECT_TRUE(StringRef("aab") < StringRef("aad"));
 129   EXPECT_FALSE(StringRef("aab") < StringRef("aab"));
 130   EXPECT_TRUE(StringRef("aab") <= StringRef("aab"));
 131   EXPECT_FALSE(StringRef("aab") <= StringRef("aaa"));
 132   EXPECT_TRUE(StringRef("aad") > StringRef("aab"));
 133   EXPECT_FALSE(StringRef("aab") > StringRef("aab"));
 134   EXPECT_TRUE(StringRef("aab") >= StringRef("aab"));
 135   EXPECT_FALSE(StringRef("aaa") >= StringRef("aab"));
 136   EXPECT_EQ(StringRef("aab"), StringRef("aab"));
 137   EXPECT_FALSE(StringRef("aab") == StringRef("aac"));
 138   EXPECT_FALSE(StringRef("aab") != StringRef("aab"));
 139   EXPECT_TRUE(StringRef("aab") != StringRef("aac"));
 140   EXPECT_EQ('a', StringRef("aab")[1]);
 141 }
 142
 143 TEST(StringRefTest, Substr) {
 144   StringRef Str("hello");
 145   EXPECT_EQ("lo", Str.substr(3));
 146   EXPECT_EQ("", Str.substr(100));
 147   EXPECT_EQ("hello", Str.substr(0, 100));
 148   EXPECT_EQ("o", Str.substr(4, 10));
 149 }
 150
 151 TEST(StringRefTest, Slice) {
 152   StringRef Str("hello");
 153   EXPECT_EQ("l", Str.slice(2, 3));
 154   EXPECT_EQ("ell", Str.slice(1, 4));
 155   EXPECT_EQ("llo", Str.slice(2, 100));
 156   EXPECT_EQ("", Str.slice(2, 1));
 157   EXPECT_EQ("", Str.slice(10, 20));
 158 }
 159
 160 TEST(StringRefTest, Split) {
 161   StringRef Str("hello");
 162   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
 163             Str.split('X'));
 164   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
 165             Str.split('e'));
 166   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
 167             Str.split('h'));
 168   EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("lo")),
 169             Str.split('l'));
 170   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
 171             Str.split('o'));
 172
 173   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
 174             Str.rsplit('X'));
 175   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
 176             Str.rsplit('e'));
 177   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
 178             Str.rsplit('h'));
 179   EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
 180             Str.rsplit('l'));
 181   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
 182             Str.rsplit('o'));
 183
 184   EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("o")),
 185                     Str.rsplit("ll"));
 186   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
 187                     Str.rsplit("h"));
 188   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
 189               Str.rsplit("o"));
 190   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
 191                     Str.rsplit("::"));
 192   EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
 193                     Str.rsplit("l"));
 194 }
 195
 196 TEST(StringRefTest, Split2) {
 197   SmallVector<StringRef, 5> parts;
 198   SmallVector<StringRef, 5> expected;
 199
 200   expected.push_back("ab"); expected.push_back("c");
 201   StringRef(",ab,,c,").split(parts, ",", -1, false);
 202   EXPECT_TRUE(parts == expected);
 203
 204   expected.clear(); parts.clear();
 205   expected.push_back(""); expected.push_back("ab"); expected.push_back("");
 206   expected.push_back("c"); expected.push_back("");
 207   StringRef(",ab,,c,").split(parts, ",", -1, true);
 208   EXPECT_TRUE(parts == expected);
 209
 210   expected.clear(); parts.clear();
 211   expected.push_back("");
 212   StringRef("").split(parts, ",", -1, true);
 213   EXPECT_TRUE(parts == expected);
 214
 215   expected.clear(); parts.clear();
 216   StringRef("").split(parts, ",", -1, false);
 217   EXPECT_TRUE(parts == expected);
 218
 219   expected.clear(); parts.clear();
 220   StringRef(",").split(parts, ",", -1, false);
 221   EXPECT_TRUE(parts == expected);
 222
 223   expected.clear(); parts.clear();
 224   expected.push_back(""); expected.push_back("");
 225   StringRef(",").split(parts, ",", -1, true);
 226   EXPECT_TRUE(parts == expected);
 227
 228   expected.clear(); parts.clear();
 229   expected.push_back("a"); expected.push_back("b");
 230   StringRef("a,b").split(parts, ",", -1, true);
 231   EXPECT_TRUE(parts == expected);
 232
 233   // Test MaxSplit
 234   expected.clear(); parts.clear();
 235   expected.push_back("a,,b,c");
 236   StringRef("a,,b,c").split(parts, ",", 0, true);
 237   EXPECT_TRUE(parts == expected);
 238
 239   expected.clear(); parts.clear();
 240   expected.push_back("a,,b,c");
 241   StringRef("a,,b,c").split(parts, ",", 0, false);
 242   EXPECT_TRUE(parts == expected);
 243
 244   expected.clear(); parts.clear();
 245   expected.push_back("a"); expected.push_back(",b,c");
 246   StringRef("a,,b,c").split(parts, ",", 1, true);
 247   EXPECT_TRUE(parts == expected);
 248
 249   expected.clear(); parts.clear();
 250   expected.push_back("a"); expected.push_back(",b,c");
 251   StringRef("a,,b,c").split(parts, ",", 1, false);
 252   EXPECT_TRUE(parts == expected);
 253
 254   expected.clear(); parts.clear();
 255   expected.push_back("a"); expected.push_back(""); expected.push_back("b,c");
 256   StringRef("a,,b,c").split(parts, ",", 2, true);
 257   EXPECT_TRUE(parts == expected);
 258
 259   expected.clear(); parts.clear();
 260   expected.push_back("a"); expected.push_back("b,c");
 261   StringRef("a,,b,c").split(parts, ",", 2, false);
 262   EXPECT_TRUE(parts == expected);
 263
 264   expected.clear(); parts.clear();
 265   expected.push_back("a"); expected.push_back(""); expected.push_back("b");
 266   expected.push_back("c");
 267   StringRef("a,,b,c").split(parts, ",", 3, true);
 268   EXPECT_TRUE(parts == expected);
 269
 270   expected.clear(); parts.clear();
 271   expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
 272   StringRef("a,,b,c").split(parts, ",", 3, false);
 273   EXPECT_TRUE(parts == expected);
 274
 275   expected.clear(); parts.clear();
 276   expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
 277   StringRef("a,,b,c").split(parts, ',', 3, false);
 278   EXPECT_TRUE(parts == expected);
 279
 280   expected.clear(); parts.clear();
 281   expected.push_back("");
 282   StringRef().split(parts, ",", 0, true);
 283   EXPECT_TRUE(parts == expected);
 284
 285   expected.clear(); parts.clear();
 286   expected.push_back(StringRef());
 287   StringRef("").split(parts, ",", 0, true);
 288   EXPECT_TRUE(parts == expected);
 289
 290   expected.clear(); parts.clear();
 291   StringRef("").split(parts, ",", 0, false);
 292   EXPECT_TRUE(parts == expected);
 293   StringRef().split(parts, ",", 0, false);
 294   EXPECT_TRUE(parts == expected);
 295
 296   expected.clear(); parts.clear();
 297   expected.push_back("a");
 298   expected.push_back("");
 299   expected.push_back("b");
 300   expected.push_back("c,d");
 301   StringRef("a,,b,c,d").split(parts, ",", 3, true);
 302   EXPECT_TRUE(parts == expected);
 303
 304   expected.clear(); parts.clear();
 305   expected.push_back("");
 306   StringRef().split(parts, ',', 0, true);
 307   EXPECT_TRUE(parts == expected);
 308
 309   expected.clear(); parts.clear();
 310   expected.push_back(StringRef());
 311   StringRef("").split(parts, ',', 0, true);
 312   EXPECT_TRUE(parts == expected);
 313
 314   expected.clear(); parts.clear();
 315   StringRef("").split(parts, ',', 0, false);
 316   EXPECT_TRUE(parts == expected);
 317   StringRef().split(parts, ',', 0, false);
 318   EXPECT_TRUE(parts == expected);
 319
 320   expected.clear(); parts.clear();
 321   expected.push_back("a");
 322   expected.push_back("");
 323   expected.push_back("b");
 324   expected.push_back("c,d");
 325   StringRef("a,,b,c,d").split(parts, ',', 3, true);
 326   EXPECT_TRUE(parts == expected);
 327 }
 328
 329 TEST(StringRefTest, Trim) {
 330   StringRef Str0("hello");
 331   StringRef Str1(" hello ");
 332   StringRef Str2("  hello  ");
 333
 334   EXPECT_EQ(StringRef("hello"), Str0.rtrim());
 335   EXPECT_EQ(StringRef(" hello"), Str1.rtrim());
 336   EXPECT_EQ(StringRef("  hello"), Str2.rtrim());
 337   EXPECT_EQ(StringRef("hello"), Str0.ltrim());
 338   EXPECT_EQ(StringRef("hello "), Str1.ltrim());
 339   EXPECT_EQ(StringRef("hello  "), Str2.ltrim());
 340   EXPECT_EQ(StringRef("hello"), Str0.trim());
 341   EXPECT_EQ(StringRef("hello"), Str1.trim());
 342   EXPECT_EQ(StringRef("hello"), Str2.trim());
 343
 344   EXPECT_EQ(StringRef("ello"), Str0.trim("hhhhhhhhhhh"));
 345
 346   EXPECT_EQ(StringRef(""), StringRef("").trim());
 347   EXPECT_EQ(StringRef(""), StringRef(" ").trim());
 348   EXPECT_EQ(StringRef("\0", 1), StringRef(" \0 ", 3).trim());
 349   EXPECT_EQ(StringRef("\0\0", 2), StringRef("\0\0", 2).trim());
 350   EXPECT_EQ(StringRef("x"), StringRef("\0\0x\0\0", 5).trim('\0'));
 351 }
 352
 353 TEST(StringRefTest, StartsWith) {
 354   StringRef Str("hello");
 355   EXPECT_TRUE(Str.startswith(""));
 356   EXPECT_TRUE(Str.startswith("he"));
 357   EXPECT_FALSE(Str.startswith("helloworld"));
 358   EXPECT_FALSE(Str.startswith("hi"));
 359 }
 360
 361 TEST(StringRefTest, StartsWithLower) {
 362   StringRef Str("heLLo");
 363   EXPECT_TRUE(Str.startswith_lower(""));
 364   EXPECT_TRUE(Str.startswith_lower("he"));
 365   EXPECT_TRUE(Str.startswith_lower("hell"));
 366   EXPECT_TRUE(Str.startswith_lower("HELlo"));
 367   EXPECT_FALSE(Str.startswith_lower("helloworld"));
 368   EXPECT_FALSE(Str.startswith_lower("hi"));
 369 }
 370
 371 TEST(StringRefTest, ConsumeFront) {
 372   StringRef Str("hello");
 373   EXPECT_TRUE(Str.consume_front(""));
 374   EXPECT_EQ("hello", Str);
 375   EXPECT_TRUE(Str.consume_front("he"));
 376   EXPECT_EQ("llo", Str);
 377   EXPECT_FALSE(Str.consume_front("lloworld"));
 378   EXPECT_EQ("llo", Str);
 379   EXPECT_FALSE(Str.consume_front("lol"));
 380   EXPECT_EQ("llo", Str);
 381   EXPECT_TRUE(Str.consume_front("llo"));
 382   EXPECT_EQ("", Str);
 383   EXPECT_FALSE(Str.consume_front("o"));
 384   EXPECT_TRUE(Str.consume_front(""));
 385 }
 386
 387 TEST(StringRefTest, EndsWith) {
 388   StringRef Str("hello");
 389   EXPECT_TRUE(Str.endswith(""));
 390   EXPECT_TRUE(Str.endswith("lo"));
 391   EXPECT_FALSE(Str.endswith("helloworld"));
 392   EXPECT_FALSE(Str.endswith("worldhello"));
 393   EXPECT_FALSE(Str.endswith("so"));
 394 }
 395
 396 TEST(StringRefTest, EndsWithLower) {
 397   StringRef Str("heLLo");
 398   EXPECT_TRUE(Str.endswith_lower(""));
 399   EXPECT_TRUE(Str.endswith_lower("lo"));
 400   EXPECT_TRUE(Str.endswith_lower("LO"));
 401   EXPECT_TRUE(Str.endswith_lower("ELlo"));
 402   EXPECT_FALSE(Str.endswith_lower("helloworld"));
 403   EXPECT_FALSE(Str.endswith_lower("hi"));
 404 }
 405
 406 TEST(StringRefTest, ConsumeBack) {
 407   StringRef Str("hello");
 408   EXPECT_TRUE(Str.consume_back(""));
 409   EXPECT_EQ("hello", Str);
 410   EXPECT_TRUE(Str.consume_back("lo"));
 411   EXPECT_EQ("hel", Str);
 412   EXPECT_FALSE(Str.consume_back("helhel"));
 413   EXPECT_EQ("hel", Str);
 414   EXPECT_FALSE(Str.consume_back("hle"));
 415   EXPECT_EQ("hel", Str);
 416   EXPECT_TRUE(Str.consume_back("hel"));
 417   EXPECT_EQ("", Str);
 418   EXPECT_FALSE(Str.consume_back("h"));
 419   EXPECT_TRUE(Str.consume_back(""));
 420 }
 421
 422 TEST(StringRefTest, Find) {
 423   StringRef Str("helloHELLO");
 424   StringRef LongStr("hellx xello hell ello world foo bar hello HELLO");
 425
 426   struct {
 427     StringRef Str;
 428     char C;
 429     std::size_t From;
 430     std::size_t Pos;
 431     std::size_t LowerPos;
 432   } CharExpectations[] = {
 433       {Str, 'h', 0U, 0U, 0U},
 434       {Str, 'e', 0U, 1U, 1U},
 435       {Str, 'l', 0U, 2U, 2U},
 436       {Str, 'l', 3U, 3U, 3U},
 437       {Str, 'o', 0U, 4U, 4U},
 438       {Str, 'L', 0U, 7U, 2U},
 439       {Str, 'z', 0U, StringRef::npos, StringRef::npos},
 440   };
 441
 442   struct {
 443     StringRef Str;
 444     llvm::StringRef S;
 445     std::size_t From;
 446     std::size_t Pos;
 447     std::size_t LowerPos;
 448   } StrExpectations[] = {
 449       {Str, "helloword", 0, StringRef::npos, StringRef::npos},
 450       {Str, "hello", 0, 0U, 0U},
 451       {Str, "ello", 0, 1U, 1U},
 452       {Str, "zz", 0, StringRef::npos, StringRef::npos},
 453       {Str, "ll", 2U, 2U, 2U},
 454       {Str, "ll", 3U, StringRef::npos, 7U},
 455       {Str, "LL", 2U, 7U, 2U},
 456       {Str, "LL", 3U, 7U, 7U},
 457       {Str, "", 0U, 0U, 0U},
 458       {LongStr, "hello", 0U, 36U, 36U},
 459       {LongStr, "foo", 0U, 28U, 28U},
 460       {LongStr, "hell", 2U, 12U, 12U},
 461       {LongStr, "HELL", 2U, 42U, 12U},
 462       {LongStr, "", 0U, 0U, 0U}};
 463
 464   for (auto &E : CharExpectations) {
 465     EXPECT_EQ(E.Pos, E.Str.find(E.C, E.From));
 466     EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.C, E.From));
 467     EXPECT_EQ(E.LowerPos, E.Str.find_lower(toupper(E.C), E.From));
 468   }
 469
 470   for (auto &E : StrExpectations) {
 471     EXPECT_EQ(E.Pos, E.Str.find(E.S, E.From));
 472     EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.S, E.From));
 473     EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.S.upper(), E.From));
 474   }
 475
 476   EXPECT_EQ(3U, Str.rfind('l'));
 477   EXPECT_EQ(StringRef::npos, Str.rfind('z'));
 478   EXPECT_EQ(StringRef::npos, Str.rfind("helloworld"));
 479   EXPECT_EQ(0U, Str.rfind("hello"));
 480   EXPECT_EQ(1U, Str.rfind("ello"));
 481   EXPECT_EQ(StringRef::npos, Str.rfind("zz"));
 482
 483   EXPECT_EQ(8U, Str.rfind_lower('l'));
 484   EXPECT_EQ(8U, Str.rfind_lower('L'));
 485   EXPECT_EQ(StringRef::npos, Str.rfind_lower('z'));
 486   EXPECT_EQ(StringRef::npos, Str.rfind_lower("HELLOWORLD"));
 487   EXPECT_EQ(5U, Str.rfind("HELLO"));
 488   EXPECT_EQ(6U, Str.rfind("ELLO"));
 489   EXPECT_EQ(StringRef::npos, Str.rfind("ZZ"));
 490
 491   EXPECT_EQ(2U, Str.find_first_of('l'));
 492   EXPECT_EQ(1U, Str.find_first_of("el"));
 493   EXPECT_EQ(StringRef::npos, Str.find_first_of("xyz"));
 494
 495   Str = "hello";
 496   EXPECT_EQ(1U, Str.find_first_not_of('h'));
 497   EXPECT_EQ(4U, Str.find_first_not_of("hel"));
 498   EXPECT_EQ(StringRef::npos, Str.find_first_not_of("hello"));
 499
 500   EXPECT_EQ(3U, Str.find_last_not_of('o'));
 501   EXPECT_EQ(1U, Str.find_last_not_of("lo"));
 502   EXPECT_EQ(StringRef::npos, Str.find_last_not_of("helo"));
 503 }
 504
 505 TEST(StringRefTest, Count) {
 506   StringRef Str("hello");
 507   EXPECT_EQ(2U, Str.count('l'));
 508   EXPECT_EQ(1U, Str.count('o'));
 509   EXPECT_EQ(0U, Str.count('z'));
 510   EXPECT_EQ(0U, Str.count("helloworld"));
 511   EXPECT_EQ(1U, Str.count("hello"));
 512   EXPECT_EQ(1U, Str.count("ello"));
 513   EXPECT_EQ(0U, Str.count("zz"));
 514 }
 515
 516 TEST(StringRefTest, EditDistance) {
 517   StringRef Hello("hello");
 518   EXPECT_EQ(2U, Hello.edit_distance("hill"));
 519
 520   StringRef Industry("industry");
 521   EXPECT_EQ(6U, Industry.edit_distance("interest"));
 522
 523   StringRef Soylent("soylent green is people");
 524   EXPECT_EQ(19U, Soylent.edit_distance("people soiled our green"));
 525   EXPECT_EQ(26U, Soylent.edit_distance("people soiled our green",
 526                                       /* allow replacements = */ false));
 527   EXPECT_EQ(9U, Soylent.edit_distance("people soiled our green",
 528                                       /* allow replacements = */ true,
 529                                       /* max edit distance = */ 8));
 530   EXPECT_EQ(53U, Soylent.edit_distance("people soiled our green "
 531                                        "people soiled our green "
 532                                        "people soiled our green "));
 533 }
 534
 535 TEST(StringRefTest, Misc) {
 536   std::string Storage;
 537   raw_string_ostream OS(Storage);
 538   OS << StringRef("hello");
 539   EXPECT_EQ("hello", OS.str());
 540 }
 541
 542 TEST(StringRefTest, Hashing) {
 543   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef()));
 544   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef("")));
 545   std::string S = "hello world";
 546   hash_code H = hash_value(S);
 547   EXPECT_EQ(H, hash_value(StringRef("hello world")));
 548   EXPECT_EQ(H, hash_value(StringRef(S)));
 549   EXPECT_NE(H, hash_value(StringRef("hello worl")));
 550   EXPECT_EQ(hash_value(std::string("hello worl")),
 551             hash_value(StringRef("hello worl")));
 552   EXPECT_NE(H, hash_value(StringRef("hello world ")));
 553   EXPECT_EQ(hash_value(std::string("hello world ")),
 554             hash_value(StringRef("hello world ")));
 555   EXPECT_EQ(H, hash_value(StringRef("hello world\0")));
 556   EXPECT_NE(hash_value(std::string("ello worl")),
 557             hash_value(StringRef("hello world").slice(1, -1)));
 558 }
 559
 560 struct UnsignedPair {
 561   const char *Str;
 562   uint64_t Expected;
 563 } Unsigned[] =
 564   { {"0", 0}
 565   , {"255", 255}
 566   , {"256", 256}
 567   , {"65535", 65535}
 568   , {"65536", 65536}
 569   , {"4294967295", 4294967295ULL}
 570   , {"4294967296", 4294967296ULL}
 571   , {"18446744073709551615", 18446744073709551615ULL}
 572   , {"042", 34}
 573   , {"0x42", 66}
 574   , {"0b101010", 42}
 575   };
 576
 577 struct SignedPair {
 578   const char *Str;
 579   int64_t Expected;
 580 } Signed[] =
 581   { {"0", 0}
 582   , {"-0", 0}
 583   , {"127", 127}
 584   , {"128", 128}
 585   , {"-128", -128}
 586   , {"-129", -129}
 587   , {"32767", 32767}
 588   , {"32768", 32768}
 589   , {"-32768", -32768}
 590   , {"-32769", -32769}
 591   , {"2147483647", 2147483647LL}
 592   , {"2147483648", 2147483648LL}
 593   , {"-2147483648", -2147483648LL}
 594   , {"-2147483649", -2147483649LL}
 595   , {"-9223372036854775808", -(9223372036854775807LL) - 1}
 596   , {"042", 34}
 597   , {"0x42", 66}
 598   , {"0b101010", 42}
 599   , {"-042", -34}
 600   , {"-0x42", -66}
 601   , {"-0b101010", -42}
 602   };
 603
 604 TEST(StringRefTest, getAsInteger) {
 605   uint8_t U8;
 606   uint16_t U16;
 607   uint32_t U32;
 608   uint64_t U64;
 609
 610   for (size_t i = 0; i < array_lengthof(Unsigned); ++i) {
 611     bool U8Success = StringRef(Unsigned[i].Str).getAsInteger(0, U8);
 612     if (static_cast<uint8_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 613       ASSERT_FALSE(U8Success);
 614       EXPECT_EQ(U8, Unsigned[i].Expected);
 615     } else {
 616       ASSERT_TRUE(U8Success);
 617     }
 618     bool U16Success = StringRef(Unsigned[i].Str).getAsInteger(0, U16);
 619     if (static_cast<uint16_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 620       ASSERT_FALSE(U16Success);
 621       EXPECT_EQ(U16, Unsigned[i].Expected);
 622     } else {
 623       ASSERT_TRUE(U16Success);
 624     }
 625     bool U32Success = StringRef(Unsigned[i].Str).getAsInteger(0, U32);
 626     if (static_cast<uint32_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 627       ASSERT_FALSE(U32Success);
 628       EXPECT_EQ(U32, Unsigned[i].Expected);
 629     } else {
 630       ASSERT_TRUE(U32Success);
 631     }
 632     bool U64Success = StringRef(Unsigned[i].Str).getAsInteger(0, U64);
 633     if (static_cast<uint64_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
 634       ASSERT_FALSE(U64Success);
 635       EXPECT_EQ(U64, Unsigned[i].Expected);
 636     } else {
 637       ASSERT_TRUE(U64Success);
 638     }
 639   }
 640
 641   int8_t S8;
 642   int16_t S16;
 643   int32_t S32;
 644   int64_t S64;
 645
 646   for (size_t i = 0; i < array_lengthof(Signed); ++i) {
 647     bool S8Success = StringRef(Signed[i].Str).getAsInteger(0, S8);
 648     if (static_cast<int8_t>(Signed[i].Expected) == Signed[i].Expected) {
 649       ASSERT_FALSE(S8Success);
 650       EXPECT_EQ(S8, Signed[i].Expected);
 651     } else {
 652       ASSERT_TRUE(S8Success);
 653     }
 654     bool S16Success = StringRef(Signed[i].Str).getAsInteger(0, S16);
 655     if (static_cast<int16_t>(Signed[i].Expected) == Signed[i].Expected) {
 656       ASSERT_FALSE(S16Success);
 657       EXPECT_EQ(S16, Signed[i].Expected);
 658     } else {
 659       ASSERT_TRUE(S16Success);
 660     }
 661     bool S32Success = StringRef(Signed[i].Str).getAsInteger(0, S32);
 662     if (static_cast<int32_t>(Signed[i].Expected) == Signed[i].Expected) {
 663       ASSERT_FALSE(S32Success);
 664       EXPECT_EQ(S32, Signed[i].Expected);
 665     } else {
 666       ASSERT_TRUE(S32Success);
 667     }
 668     bool S64Success = StringRef(Signed[i].Str).getAsInteger(0, S64);
 669     if (static_cast<int64_t>(Signed[i].Expected) == Signed[i].Expected) {
 670       ASSERT_FALSE(S64Success);
 671       EXPECT_EQ(S64, Signed[i].Expected);
 672     } else {
 673       ASSERT_TRUE(S64Success);
 674     }
 675   }
 676 }
 677
 678
 679 static const char* BadStrings[] = {
 680     ""                      // empty string
 681   , "18446744073709551617"  // value just over max
 682   , "123456789012345678901" // value way too large
 683   , "4t23v"                 // illegal decimal characters
 684   , "0x123W56"              // illegal hex characters
 685   , "0b2"                   // illegal bin characters
 686   , "08"                    // illegal oct characters
 687   , "0o8"                   // illegal oct characters
 688   , "-123"                  // negative unsigned value
 689   , "0x"
 690   , "0b"
 691 };
 692
 693
 694 TEST(StringRefTest, getAsUnsignedIntegerBadStrings) {
 695   unsigned long long U64;
 696   for (size_t i = 0; i < array_lengthof(BadStrings); ++i) {
 697     bool IsBadNumber = StringRef(BadStrings[i]).getAsInteger(0, U64);
 698     ASSERT_TRUE(IsBadNumber);
 699   }
 700 }
 701
 702 struct ConsumeUnsignedPair {
 703   const char *Str;
 704   uint64_t Expected;
 705   const char *Leftover;
 706 } ConsumeUnsigned[] = {
 707     {"0", 0, ""},
 708     {"255", 255, ""},
 709     {"256", 256, ""},
 710     {"65535", 65535, ""},
 711     {"65536", 65536, ""},
 712     {"4294967295", 4294967295ULL, ""},
 713     {"4294967296", 4294967296ULL, ""},
 714     {"255A376", 255, "A376"},
 715     {"18446744073709551615", 18446744073709551615ULL, ""},
 716     {"18446744073709551615ABC", 18446744073709551615ULL, "ABC"},
 717     {"042", 34, ""},
 718     {"0x42", 66, ""},
 719     {"0x42-0x34", 66, "-0x34"},
 720     {"0b101010", 42, ""},
 721     {"0429F", 042, "9F"},            // Auto-sensed octal radix, invalid digit
 722     {"0x42G12", 0x42, "G12"},        // Auto-sensed hex radix, invalid digit
 723     {"0b10101020101", 42, "20101"}}; // Auto-sensed binary radix, invalid digit.
 724
 725 struct ConsumeSignedPair {
 726   const char *Str;
 727   int64_t Expected;
 728   const char *Leftover;
 729 } ConsumeSigned[] = {
 730     {"0", 0, ""},
 731     {"-0", 0, ""},
 732     {"0-1", 0, "-1"},
 733     {"-0-1", 0, "-1"},
 734     {"127", 127, ""},
 735     {"128", 128, ""},
 736     {"127-1", 127, "-1"},
 737     {"128-1", 128, "-1"},
 738     {"-128", -128, ""},
 739     {"-129", -129, ""},
 740     {"-128-1", -128, "-1"},
 741     {"-129-1", -129, "-1"},
 742     {"32767", 32767, ""},
 743     {"32768", 32768, ""},
 744     {"32767-1", 32767, "-1"},
 745     {"32768-1", 32768, "-1"},
 746     {"-32768", -32768, ""},
 747     {"-32769", -32769, ""},
 748     {"-32768-1", -32768, "-1"},
 749     {"-32769-1", -32769, "-1"},
 750     {"2147483647", 2147483647LL, ""},
 751     {"2147483648", 2147483648LL, ""},
 752     {"2147483647-1", 2147483647LL, "-1"},
 753     {"2147483648-1", 2147483648LL, "-1"},
 754     {"-2147483648", -2147483648LL, ""},
 755     {"-2147483649", -2147483649LL, ""},
 756     {"-2147483648-1", -2147483648LL, "-1"},
 757     {"-2147483649-1", -2147483649LL, "-1"},
 758     {"-9223372036854775808", -(9223372036854775807LL) - 1, ""},
 759     {"-9223372036854775808-1", -(9223372036854775807LL) - 1, "-1"},
 760     {"042", 34, ""},
 761     {"042-1", 34, "-1"},
 762     {"0x42", 66, ""},
 763     {"0x42-1", 66, "-1"},
 764     {"0b101010", 42, ""},
 765     {"0b101010-1", 42, "-1"},
 766     {"-042", -34, ""},
 767     {"-042-1", -34, "-1"},
 768     {"-0x42", -66, ""},
 769     {"-0x42-1", -66, "-1"},
 770     {"-0b101010", -42, ""},
 771     {"-0b101010-1", -42, "-1"}};
 772
 773 TEST(StringRefTest, consumeIntegerUnsigned) {
 774   uint8_t U8;
 775   uint16_t U16;
 776   uint32_t U32;
 777   uint64_t U64;
 778
 779   for (size_t i = 0; i < array_lengthof(ConsumeUnsigned); ++i) {
 780     StringRef Str = ConsumeUnsigned[i].Str;
 781     bool U8Success = Str.consumeInteger(0, U8);
 782     if (static_cast<uint8_t>(ConsumeUnsigned[i].Expected) ==
 783         ConsumeUnsigned[i].Expected) {
 784       ASSERT_FALSE(U8Success);
 785       EXPECT_EQ(U8, ConsumeUnsigned[i].Expected);
 786       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
 787     } else {
 788       ASSERT_TRUE(U8Success);
 789     }
 790
 791     Str = ConsumeUnsigned[i].Str;
 792     bool U16Success = Str.consumeInteger(0, U16);
 793     if (static_cast<uint16_t>(ConsumeUnsigned[i].Expected) ==
 794         ConsumeUnsigned[i].Expected) {
 795       ASSERT_FALSE(U16Success);
 796       EXPECT_EQ(U16, ConsumeUnsigned[i].Expected);
 797       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
 798     } else {
 799       ASSERT_TRUE(U16Success);
 800     }
 801
 802     Str = ConsumeUnsigned[i].Str;
 803     bool U32Success = Str.consumeInteger(0, U32);
 804     if (static_cast<uint32_t>(ConsumeUnsigned[i].Expected) ==
 805         ConsumeUnsigned[i].Expected) {
 806       ASSERT_FALSE(U32Success);
 807       EXPECT_EQ(U32, ConsumeUnsigned[i].Expected);
 808       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
 809     } else {
 810       ASSERT_TRUE(U32Success);
 811     }
 812
 813     Str = ConsumeUnsigned[i].Str;
 814     bool U64Success = Str.consumeInteger(0, U64);
 815     if (static_cast<uint64_t>(ConsumeUnsigned[i].Expected) ==
 816         ConsumeUnsigned[i].Expected) {
 817       ASSERT_FALSE(U64Success);
 818       EXPECT_EQ(U64, ConsumeUnsigned[i].Expected);
 819       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
 820     } else {
 821       ASSERT_TRUE(U64Success);
 822     }
 823   }
 824 }
 825
 826 TEST(StringRefTest, consumeIntegerSigned) {
 827   int8_t S8;
 828   int16_t S16;
 829   int32_t S32;
 830   int64_t S64;
 831
 832   for (size_t i = 0; i < array_lengthof(ConsumeSigned); ++i) {
 833     StringRef Str = ConsumeSigned[i].Str;
 834     bool S8Success = Str.consumeInteger(0, S8);
 835     if (static_cast<int8_t>(ConsumeSigned[i].Expected) ==
 836         ConsumeSigned[i].Expected) {
 837       ASSERT_FALSE(S8Success);
 838       EXPECT_EQ(S8, ConsumeSigned[i].Expected);
 839       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
 840     } else {
 841       ASSERT_TRUE(S8Success);
 842     }
 843
 844     Str = ConsumeSigned[i].Str;
 845     bool S16Success = Str.consumeInteger(0, S16);
 846     if (static_cast<int16_t>(ConsumeSigned[i].Expected) ==
 847         ConsumeSigned[i].Expected) {
 848       ASSERT_FALSE(S16Success);
 849       EXPECT_EQ(S16, ConsumeSigned[i].Expected);
 850       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
 851     } else {
 852       ASSERT_TRUE(S16Success);
 853     }
 854
 855     Str = ConsumeSigned[i].Str;
 856     bool S32Success = Str.consumeInteger(0, S32);
 857     if (static_cast<int32_t>(ConsumeSigned[i].Expected) ==
 858         ConsumeSigned[i].Expected) {
 859       ASSERT_FALSE(S32Success);
 860       EXPECT_EQ(S32, ConsumeSigned[i].Expected);
 861       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
 862     } else {
 863       ASSERT_TRUE(S32Success);
 864     }
 865
 866     Str = ConsumeSigned[i].Str;
 867     bool S64Success = Str.consumeInteger(0, S64);
 868     if (static_cast<int64_t>(ConsumeSigned[i].Expected) ==
 869         ConsumeSigned[i].Expected) {
 870       ASSERT_FALSE(S64Success);
 871       EXPECT_EQ(S64, ConsumeSigned[i].Expected);
 872       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
 873     } else {
 874       ASSERT_TRUE(S64Success);
 875     }
 876   }
 877 }
 878
 879 struct GetDoubleStrings {
 880   const char *Str;
 881   bool AllowInexact;
 882   bool ShouldFail;
 883   double D;
 884 } DoubleStrings[] = {{"0", false, false, 0.0},
 885                      {"0.0", false, false, 0.0},
 886                      {"-0.0", false, false, -0.0},
 887                      {"123.45", false, true, 123.45},
 888                      {"123.45", true, false, 123.45},
 889                      {"1.8e308", true, false, std::numeric_limits<double>::infinity()},
 890                      {"1.8e308", false, true, std::numeric_limits<double>::infinity()},
 891                      {"0x0.0000000000001P-1023", false, true, 0.0},
 892                      {"0x0.0000000000001P-1023", true, false, 0.0},
 893                     };
 894
 895 TEST(StringRefTest, getAsDouble) {
 896   for (const auto &Entry : DoubleStrings) {
 897     double Result;
 898     StringRef S(Entry.Str);
 899     EXPECT_EQ(Entry.ShouldFail, S.getAsDouble(Result, Entry.AllowInexact));
 900     if (!Entry.ShouldFail) {
 901       EXPECT_EQ(Result, Entry.D);
 902     }
 903   }
 904 }
 905
 906 static const char *join_input[] = { "a", "b", "c" };
 907 static const char join_result1[] = "a";
 908 static const char join_result2[] = "a:b:c";
 909 static const char join_result3[] = "a::b::c";
 910
 911 TEST(StringRefTest, joinStrings) {
 912   std::vector<StringRef> v1;
 913   std::vector<std::string> v2;
 914   for (size_t i = 0; i < array_lengthof(join_input); ++i) {
 915     v1.push_back(join_input[i]);
 916     v2.push_back(join_input[i]);
 917   }
 918
 919   bool v1_join1 = join(v1.begin(), v1.begin() + 1, ":") == join_result1;
 920   EXPECT_TRUE(v1_join1);
 921   bool v1_join2 = join(v1.begin(), v1.end(), ":") == join_result2;
 922   EXPECT_TRUE(v1_join2);
 923   bool v1_join3 = join(v1.begin(), v1.end(), "::") == join_result3;
 924   EXPECT_TRUE(v1_join3);
 925
 926   bool v2_join1 = join(v2.begin(), v2.begin() + 1, ":") == join_result1;
 927   EXPECT_TRUE(v2_join1);
 928   bool v2_join2 = join(v2.begin(), v2.end(), ":") == join_result2;
 929   EXPECT_TRUE(v2_join2);
 930   bool v2_join3 = join(v2.begin(), v2.end(), "::") == join_result3;
 931   EXPECT_TRUE(v2_join3);
 932   v2_join3 = join(v2, "::") == join_result3;
 933   EXPECT_TRUE(v2_join3);
 934 }
 935
 936
 937 TEST(StringRefTest, AllocatorCopy) {
 938   BumpPtrAllocator Alloc;
 939   // First test empty strings.  We don't want these to allocate anything on the
 940   // allocator.
 941   StringRef StrEmpty = "";
 942   StringRef StrEmptyc = StrEmpty.copy(Alloc);
 943   EXPECT_TRUE(StrEmpty.equals(StrEmptyc));
 944   EXPECT_EQ(StrEmptyc.data(), nullptr);
 945   EXPECT_EQ(StrEmptyc.size(), 0u);
 946   EXPECT_EQ(Alloc.getTotalMemory(), 0u);
 947
 948   StringRef Str1 = "hello";
 949   StringRef Str2 = "bye";
 950   StringRef Str1c = Str1.copy(Alloc);
 951   StringRef Str2c = Str2.copy(Alloc);
 952   EXPECT_TRUE(Str1.equals(Str1c));
 953   EXPECT_NE(Str1.data(), Str1c.data());
 954   EXPECT_TRUE(Str2.equals(Str2c));
 955   EXPECT_NE(Str2.data(), Str2c.data());
 956 }
 957
 958 TEST(StringRefTest, Drop) {
 959   StringRef Test("StringRefTest::Drop");
 960
 961   StringRef Dropped = Test.drop_front(5);
 962   EXPECT_EQ(Dropped, "gRefTest::Drop");
 963
 964   Dropped = Test.drop_back(5);
 965   EXPECT_EQ(Dropped, "StringRefTest:");
 966
 967   Dropped = Test.drop_front(0);
 968   EXPECT_EQ(Dropped, Test);
 969
 970   Dropped = Test.drop_back(0);
 971   EXPECT_EQ(Dropped, Test);
 972
 973   Dropped = Test.drop_front(Test.size());
 974   EXPECT_TRUE(Dropped.empty());
 975
 976   Dropped = Test.drop_back(Test.size());
 977   EXPECT_TRUE(Dropped.empty());
 978 }
 979
 980 TEST(StringRefTest, Take) {
 981   StringRef Test("StringRefTest::Take");
 982
 983   StringRef Taken = Test.take_front(5);
 984   EXPECT_EQ(Taken, "Strin");
 985
 986   Taken = Test.take_back(5);
 987   EXPECT_EQ(Taken, ":Take");
 988
 989   Taken = Test.take_front(Test.size());
 990   EXPECT_EQ(Taken, Test);
 991
 992   Taken = Test.take_back(Test.size());
 993   EXPECT_EQ(Taken, Test);
 994
 995   Taken = Test.take_front(0);
 996   EXPECT_TRUE(Taken.empty());
 997
 998   Taken = Test.take_back(0);
 999   EXPECT_TRUE(Taken.empty());
1000 }
1001
1002 TEST(StringRefTest, FindIf) {
1003   StringRef Punct("Test.String");
1004   StringRef NoPunct("ABCDEFG");
1005   StringRef Empty;
1006
1007   auto IsPunct = [](char c) { return ::ispunct(c); };
1008   auto IsAlpha = [](char c) { return ::isalpha(c); };
1009   EXPECT_EQ(4U, Punct.find_if(IsPunct));
1010   EXPECT_EQ(StringRef::npos, NoPunct.find_if(IsPunct));
1011   EXPECT_EQ(StringRef::npos, Empty.find_if(IsPunct));
1012
1013   EXPECT_EQ(4U, Punct.find_if_not(IsAlpha));
1014   EXPECT_EQ(StringRef::npos, NoPunct.find_if_not(IsAlpha));
1015   EXPECT_EQ(StringRef::npos, Empty.find_if_not(IsAlpha));
1016 }
1017
1018 TEST(StringRefTest, TakeWhileUntil) {
1019   StringRef Test("String With 1 Number");
1020
1021   StringRef Taken = Test.take_while([](char c) { return ::isdigit(c); });
1022   EXPECT_EQ("", Taken);
1023
1024   Taken = Test.take_until([](char c) { return ::isdigit(c); });
1025   EXPECT_EQ("String With ", Taken);
1026
1027   Taken = Test.take_while([](char c) { return true; });
1028   EXPECT_EQ(Test, Taken);
1029
1030   Taken = Test.take_until([](char c) { return true; });
1031   EXPECT_EQ("", Taken);
1032
1033   Test = "";
1034   Taken = Test.take_while([](char c) { return true; });
1035   EXPECT_EQ("", Taken);
1036 }
1037
1038 TEST(StringRefTest, DropWhileUntil) {
1039   StringRef Test("String With 1 Number");
1040
1041   StringRef Taken = Test.drop_while([](char c) { return ::isdigit(c); });
1042   EXPECT_EQ(Test, Taken);
1043
1044   Taken = Test.drop_until([](char c) { return ::isdigit(c); });
1045   EXPECT_EQ("1 Number", Taken);
1046
1047   Taken = Test.drop_while([](char c) { return true; });
1048   EXPECT_EQ("", Taken);
1049
1050   Taken = Test.drop_until([](char c) { return true; });
1051   EXPECT_EQ(Test, Taken);
1052
1053   StringRef EmptyString = "";
1054   Taken = EmptyString.drop_while([](char c) { return true; });
1055   EXPECT_EQ("", Taken);
1056 }
1057
1058 TEST(StringRefTest, StringLiteral) {
1059   constexpr StringLiteral Strings[] = {"Foo", "Bar"};
1060   EXPECT_EQ(StringRef("Foo"), Strings[0]);
1061   EXPECT_EQ(StringRef("Bar"), Strings[1]);
1062 }
1063
1064 static_assert(is_trivially_copyable<StringRef>::value, "trivially copyable");
1065
1066 } // end anonymous namespace