llvm-project/llvm/unittests/ADT/SmallStringTest.cpp

//===- llvm/unittest/ADT/SmallStringTest.cpp ------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// SmallString unit tests.
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/SmallString.h"
#include "gtest/gtest.h"
#include <climits>
#include <cstring>
#include <stdarg.h>

using namespace llvm;

namespace {

// Test fixture class
class SmallStringTest : public testing::Test {
protected:
  typedef SmallString<40> StringType;

  StringType theString;

  void assertEmpty(StringType & v) {
    // Size tests
    EXPECT_EQ(0u, v.size());
    EXPECT_TRUE(v.empty());
    // Iterator tests
    EXPECT_TRUE(v.begin() == v.end());
  }
};

// New string test.
TEST_F(SmallStringTest, EmptyStringTest) {
  SCOPED_TRACE("EmptyStringTest");
  assertEmpty(theString);
  EXPECT_TRUE(theString.rbegin() == theString.rend());
}

TEST_F(SmallStringTest, AssignRepeated) {
  theString.assign(3, 'a');
  EXPECT_EQ(3u, theString.size());
  EXPECT_STREQ("aaa", theString.c_str());
}

TEST_F(SmallStringTest, AssignIterPair) {
  StringRef abc = "abc";
  theString.assign(abc.begin(), abc.end());
  EXPECT_EQ(3u, theString.size());
  EXPECT_STREQ("abc", theString.c_str());
}

TEST_F(SmallStringTest, AssignStringRef) {
  StringRef abc = "abc";
  theString.assign(abc);
  EXPECT_EQ(3u, theString.size());
  EXPECT_STREQ("abc", theString.c_str());
}

TEST_F(SmallStringTest, AssignSmallVector) {
  StringRef abc = "abc";
  SmallVector<char, 10> abcVec(abc.begin(), abc.end());
  theString.assign(abcVec);
  EXPECT_EQ(3u, theString.size());
  EXPECT_STREQ("abc", theString.c_str());
}

TEST_F(SmallStringTest, AssignStringRefs) {
  theString.assign({"abc", "def", "ghi"});
  EXPECT_EQ(9u, theString.size());
  EXPECT_STREQ("abcdefghi", theString.c_str());
}

TEST_F(SmallStringTest, AppendIterPair) {
  StringRef abc = "abc";
  theString.append(abc.begin(), abc.end());
  theString.append(abc.begin(), abc.end());
  EXPECT_EQ(6u, theString.size());
  EXPECT_STREQ("abcabc", theString.c_str());
}

TEST_F(SmallStringTest, AppendStringRef) {
  StringRef abc = "abc";
  theString.append(abc);
  theString.append(abc);
  EXPECT_EQ(6u, theString.size());
  EXPECT_STREQ("abcabc", theString.c_str());
}

TEST_F(SmallStringTest, AppendSmallVector) {
  StringRef abc = "abc";
  SmallVector<char, 10> abcVec(abc.begin(), abc.end());
  theString.append(abcVec);
  theString.append(abcVec);
  EXPECT_EQ(6u, theString.size());
  EXPECT_STREQ("abcabc", theString.c_str());
}

TEST_F(SmallStringTest, AppendStringRefs) {
  theString.append({"abc", "def", "ghi"});
  EXPECT_EQ(9u, theString.size());
  EXPECT_STREQ("abcdefghi", theString.c_str());
  StringRef Jkl = "jkl";
  std::string Mno = "mno";
  SmallString<4> Pqr("pqr");
  const char *Stu = "stu";
  theString.append({Jkl, Mno, Pqr, Stu});
  EXPECT_EQ(21u, theString.size());
  EXPECT_STREQ("abcdefghijklmnopqrstu", theString.c_str());
}

TEST_F(SmallStringTest, StringRefConversion) {
  StringRef abc = "abc";
  theString.assign(abc.begin(), abc.end());
  StringRef theStringRef = theString;
  EXPECT_EQ("abc", theStringRef);
}

TEST_F(SmallStringTest, StdStringConversion) {
  StringRef abc = "abc";
  theString.assign(abc.begin(), abc.end());
  std::string theStdString = std::string(theString);
  EXPECT_EQ("abc", theStdString);
}

TEST_F(SmallStringTest, Substr) {
  theString = "hello";
  EXPECT_EQ("lo", theString.substr(3));
  EXPECT_EQ("", theString.substr(100));
  EXPECT_EQ("hello", theString.substr(0, 100));
  EXPECT_EQ("o", theString.substr(4, 10));
}

TEST_F(SmallStringTest, Slice) {
  theString = "hello";
  EXPECT_EQ("l", theString.slice(2, 3));
  EXPECT_EQ("ell", theString.slice(1, 4));
  EXPECT_EQ("llo", theString.slice(2, 100));
  EXPECT_EQ("", theString.slice(2, 1));
  EXPECT_EQ("", theString.slice(10, 20));
}

TEST_F(SmallStringTest, Find) {
  theString = "hello";
  EXPECT_EQ(2U, theString.find('l'));
  EXPECT_EQ(StringRef::npos, theString.find('z'));
  EXPECT_EQ(StringRef::npos, theString.find("helloworld"));
  EXPECT_EQ(0U, theString.find("hello"));
  EXPECT_EQ(1U, theString.find("ello"));
  EXPECT_EQ(StringRef::npos, theString.find("zz"));
  EXPECT_EQ(2U, theString.find("ll", 2));
  EXPECT_EQ(StringRef::npos, theString.find("ll", 3));
  EXPECT_EQ(0U, theString.find(""));

  EXPECT_EQ(3U, theString.rfind('l'));
  EXPECT_EQ(StringRef::npos, theString.rfind('z'));
  EXPECT_EQ(StringRef::npos, theString.rfind("helloworld"));
  EXPECT_EQ(0U, theString.rfind("hello"));
  EXPECT_EQ(1U, theString.rfind("ello"));
  EXPECT_EQ(StringRef::npos, theString.rfind("zz"));

  EXPECT_EQ(2U, theString.find_first_of('l'));
  EXPECT_EQ(1U, theString.find_first_of("el"));
  EXPECT_EQ(StringRef::npos, theString.find_first_of("xyz"));

  EXPECT_EQ(1U, theString.find_first_not_of('h'));
  EXPECT_EQ(4U, theString.find_first_not_of("hel"));
  EXPECT_EQ(StringRef::npos, theString.find_first_not_of("hello"));

  theString = "hellx xello hell ello world foo bar hello";
  EXPECT_EQ(36U, theString.find("hello"));
  EXPECT_EQ(28U, theString.find("foo"));
  EXPECT_EQ(12U, theString.find("hell", 2));
  EXPECT_EQ(0U, theString.find(""));
}

TEST_F(SmallStringTest, Count) {
  theString = "hello";
  EXPECT_EQ(2U, theString.count('l'));
  EXPECT_EQ(1U, theString.count('o'));
  EXPECT_EQ(0U, theString.count('z'));
  EXPECT_EQ(0U, theString.count("helloworld"));
  EXPECT_EQ(1U, theString.count("hello"));
  EXPECT_EQ(1U, theString.count("ello"));
  EXPECT_EQ(0U, theString.count("zz"));
}

TEST_F(SmallStringTest, Realloc) {
  theString = "abcd";
  theString.reserve(100);
  EXPECT_EQ("abcd", theString);
  unsigned const N = 100000;
  theString.reserve(N);
  for (unsigned i = 0; i < N - 4; ++i)
    theString.push_back('y');
  EXPECT_EQ("abcdyyy", theString.slice(0, 7));
}

TEST_F(SmallStringTest, Comparisons) {
  EXPECT_EQ(-1, SmallString<10>("aab").compare("aad"));
  EXPECT_EQ( 0, SmallString<10>("aab").compare("aab"));
  EXPECT_EQ( 1, SmallString<10>("aab").compare("aaa"));
  EXPECT_EQ(-1, SmallString<10>("aab").compare("aabb"));
  EXPECT_EQ( 1, SmallString<10>("aab").compare("aa"));
  EXPECT_EQ( 1, SmallString<10>("\xFF").compare("\1"));

  EXPECT_EQ(-1, SmallString<10>("AaB").compare_lower("aAd"));
  EXPECT_EQ( 0, SmallString<10>("AaB").compare_lower("aab"));
  EXPECT_EQ( 1, SmallString<10>("AaB").compare_lower("AAA"));
  EXPECT_EQ(-1, SmallString<10>("AaB").compare_lower("aaBb"));
  EXPECT_EQ( 1, SmallString<10>("AaB").compare_lower("aA"));
  EXPECT_EQ( 1, SmallString<10>("\xFF").compare_lower("\1"));

  EXPECT_EQ(-1, SmallString<10>("aab").compare_numeric("aad"));
  EXPECT_EQ( 0, SmallString<10>("aab").compare_numeric("aab"));
  EXPECT_EQ( 1, SmallString<10>("aab").compare_numeric("aaa"));
  EXPECT_EQ(-1, SmallString<10>("aab").compare_numeric("aabb"));
  EXPECT_EQ( 1, SmallString<10>("aab").compare_numeric("aa"));
  EXPECT_EQ(-1, SmallString<10>("1").compare_numeric("10"));
  EXPECT_EQ( 0, SmallString<10>("10").compare_numeric("10"));
  EXPECT_EQ( 0, SmallString<10>("10a").compare_numeric("10a"));
  EXPECT_EQ( 1, SmallString<10>("2").compare_numeric("1"));
  EXPECT_EQ( 0, SmallString<10>("llvm_v1i64_ty").compare_numeric("llvm_v1i64_ty"));
  EXPECT_EQ( 1, SmallString<10>("\xFF").compare_numeric("\1"));
  EXPECT_EQ( 1, SmallString<10>("V16").compare_numeric("V1_q0"));
  EXPECT_EQ(-1, SmallString<10>("V1_q0").compare_numeric("V16"));
  EXPECT_EQ(-1, SmallString<10>("V8_q0").compare_numeric("V16"));
  EXPECT_EQ( 1, SmallString<10>("V16").compare_numeric("V8_q0"));
  EXPECT_EQ(-1, SmallString<10>("V1_q0").compare_numeric("V8_q0"));
  EXPECT_EQ( 1, SmallString<10>("V8_q0").compare_numeric("V1_q0"));
}

// Check gtest prints SmallString as a string instead of a container of chars.
// The code is in utils/unittest/googletest/internal/custom/gtest-printers.h
TEST_F(SmallStringTest, GTestPrinter) {
  EXPECT_EQ(R"("foo")", ::testing::PrintToString(SmallString<1>("foo")));
  const SmallVectorImpl<char> &ErasedSmallString = SmallString<1>("foo");
  EXPECT_EQ(R"("foo")", ::testing::PrintToString(ErasedSmallString));
}

} // namespace