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abseil-cpp/absl/strings/string_view_test.cc

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/strings/string_view.h"
#include <stdlib.h>
#include <iomanip>
#include <iterator>
#include <limits>
#include <map>
#include <sstream>
#include <stdexcept>
#include <string>
#include <type_traits>
#include <utility>
#include "gtest/gtest.h"
#include "absl/base/config.h"
#include "absl/base/dynamic_annotations.h"
#ifdef __ANDROID__
// Android assert messages only go to system log, so death tests cannot inspect
// the message for matching.
#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \
EXPECT_DEATH_IF_SUPPORTED(statement, ".*")
#else
#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \
EXPECT_DEATH_IF_SUPPORTED(statement, regex)
#endif
namespace {
// A minimal allocator that uses malloc().
template <typename T>
struct Mallocator {
typedef T value_type;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
size_type max_size() const {
return size_t(std::numeric_limits<size_type>::max()) / sizeof(value_type);
}
template <typename U>
struct rebind {
typedef Mallocator<U> other;
};
Mallocator() = default;
template <class U>
Mallocator(const Mallocator<U>&) {} // NOLINT(runtime/explicit)
T* allocate(size_t n) { return static_cast<T*>(std::malloc(n * sizeof(T))); }
void deallocate(T* p, size_t) { std::free(p); }
};
template <typename T, typename U>
bool operator==(const Mallocator<T>&, const Mallocator<U>&) {
return true;
}
template <typename T, typename U>
bool operator!=(const Mallocator<T>&, const Mallocator<U>&) {
return false;
}
TEST(StringViewTest, Ctor) {
{
// Null.
absl::string_view s10;
EXPECT_TRUE(s10.data() == nullptr);
EXPECT_EQ(0, s10.length());
}
{
// const char* without length.
const char* hello = "hello";
absl::string_view s20(hello);
EXPECT_TRUE(s20.data() == hello);
EXPECT_EQ(5, s20.length());
// const char* with length.
absl::string_view s21(hello, 4);
EXPECT_TRUE(s21.data() == hello);
EXPECT_EQ(4, s21.length());
// Not recommended, but valid C++
absl::string_view s22(hello, 6);
EXPECT_TRUE(s22.data() == hello);
EXPECT_EQ(6, s22.length());
}
{
// std::string.
std::string hola = "hola";
absl::string_view s30(hola);
EXPECT_TRUE(s30.data() == hola.data());
EXPECT_EQ(4, s30.length());
// std::string with embedded '\0'.
hola.push_back('\0');
hola.append("h2");
hola.push_back('\0');
absl::string_view s31(hola);
EXPECT_TRUE(s31.data() == hola.data());
EXPECT_EQ(8, s31.length());
}
{
using mstring =
std::basic_string<char, std::char_traits<char>, Mallocator<char>>;
mstring str1("BUNGIE-JUMPING!");
const mstring str2("SLEEPING!");
absl::string_view s1(str1);
s1.remove_prefix(strlen("BUNGIE-JUM"));
absl::string_view s2(str2);
s2.remove_prefix(strlen("SLEE"));
EXPECT_EQ(s1, s2);
EXPECT_EQ(s1, "PING!");
}
// TODO(mec): absl::string_view(const absl::string_view&);
}
TEST(StringViewTest, Swap) {
absl::string_view a("a");
absl::string_view b("bbb");
EXPECT_TRUE(noexcept(a.swap(b)));
a.swap(b);
EXPECT_EQ(a, "bbb");
EXPECT_EQ(b, "a");
a.swap(b);
EXPECT_EQ(a, "a");
EXPECT_EQ(b, "bbb");
}
TEST(StringViewTest, STLComparator) {
std::string s1("foo");
std::string s2("bar");
std::string s3("baz");
absl::string_view p1(s1);
absl::string_view p2(s2);
absl::string_view p3(s3);
typedef std::map<absl::string_view, int> TestMap;
TestMap map;
map.insert(std::make_pair(p1, 0));
map.insert(std::make_pair(p2, 1));
map.insert(std::make_pair(p3, 2));
EXPECT_EQ(map.size(), 3);
TestMap::const_iterator iter = map.begin();
EXPECT_EQ(iter->second, 1);
++iter;
EXPECT_EQ(iter->second, 2);
++iter;
EXPECT_EQ(iter->second, 0);
++iter;
EXPECT_TRUE(iter == map.end());
TestMap::iterator new_iter = map.find("zot");
EXPECT_TRUE(new_iter == map.end());
new_iter = map.find("bar");
EXPECT_TRUE(new_iter != map.end());
map.erase(new_iter);
EXPECT_EQ(map.size(), 2);
iter = map.begin();
EXPECT_EQ(iter->second, 2);
++iter;
EXPECT_EQ(iter->second, 0);
++iter;
EXPECT_TRUE(iter == map.end());
}
#define COMPARE(result, op, x, y) \
EXPECT_EQ(result, absl::string_view((x)) op absl::string_view((y))); \
EXPECT_EQ(result, absl::string_view((x)).compare(absl::string_view((y))) op 0)
TEST(StringViewTest, ComparisonOperators) {
COMPARE(true, ==, "", "");
COMPARE(true, ==, "", absl::string_view());
COMPARE(true, ==, absl::string_view(), "");
COMPARE(true, ==, "a", "a");
COMPARE(true, ==, "aa", "aa");
COMPARE(false, ==, "a", "");
COMPARE(false, ==, "", "a");
COMPARE(false, ==, "a", "b");
COMPARE(false, ==, "a", "aa");
COMPARE(false, ==, "aa", "a");
COMPARE(false, !=, "", "");
COMPARE(false, !=, "a", "a");
COMPARE(false, !=, "aa", "aa");
COMPARE(true, !=, "a", "");
COMPARE(true, !=, "", "a");
COMPARE(true, !=, "a", "b");
COMPARE(true, !=, "a", "aa");
COMPARE(true, !=, "aa", "a");
COMPARE(true, <, "a", "b");
COMPARE(true, <, "a", "aa");
COMPARE(true, <, "aa", "b");
COMPARE(true, <, "aa", "bb");
COMPARE(false, <, "a", "a");
COMPARE(false, <, "b", "a");
COMPARE(false, <, "aa", "a");
COMPARE(false, <, "b", "aa");
COMPARE(false, <, "bb", "aa");
COMPARE(true, <=, "a", "a");
COMPARE(true, <=, "a", "b");
COMPARE(true, <=, "a", "aa");
COMPARE(true, <=, "aa", "b");
COMPARE(true, <=, "aa", "bb");
COMPARE(false, <=, "b", "a");
COMPARE(false, <=, "aa", "a");
COMPARE(false, <=, "b", "aa");
COMPARE(false, <=, "bb", "aa");
COMPARE(false, >=, "a", "b");
COMPARE(false, >=, "a", "aa");
COMPARE(false, >=, "aa", "b");
COMPARE(false, >=, "aa", "bb");
COMPARE(true, >=, "a", "a");
COMPARE(true, >=, "b", "a");
COMPARE(true, >=, "aa", "a");
COMPARE(true, >=, "b", "aa");
COMPARE(true, >=, "bb", "aa");
COMPARE(false, >, "a", "a");
COMPARE(false, >, "a", "b");
COMPARE(false, >, "a", "aa");
COMPARE(false, >, "aa", "b");
COMPARE(false, >, "aa", "bb");
COMPARE(true, >, "b", "a");
COMPARE(true, >, "aa", "a");
COMPARE(true, >, "b", "aa");
COMPARE(true, >, "bb", "aa");
}
TEST(StringViewTest, ComparisonOperatorsByCharacterPosition) {
std::string x;
for (int i = 0; i < 256; i++) {
x += 'a';
std::string y = x;
COMPARE(true, ==, x, y);
for (int j = 0; j < i; j++) {
std::string z = x;
z[j] = 'b'; // Differs in position 'j'
COMPARE(false, ==, x, z);
COMPARE(true, <, x, z);
COMPARE(true, >, z, x);
if (j + 1 < i) {
z[j + 1] = 'A'; // Differs in position 'j+1' as well
COMPARE(false, ==, x, z);
COMPARE(true, <, x, z);
COMPARE(true, >, z, x);
z[j + 1] = 'z'; // Differs in position 'j+1' as well
COMPARE(false, ==, x, z);
COMPARE(true, <, x, z);
COMPARE(true, >, z, x);
}
}
}
}
#undef COMPARE
// Sadly, our users often confuse string::npos with absl::string_view::npos;
// So much so that we test here that they are the same. They need to
// both be unsigned, and both be the maximum-valued integer of their type.
template <typename T>
struct is_type {
template <typename U>
static bool same(U) {
return false;
}
static bool same(T) { return true; }
};
TEST(StringViewTest, NposMatchesStdStringView) {
EXPECT_EQ(absl::string_view::npos, std::string::npos);
EXPECT_TRUE(is_type<size_t>::same(absl::string_view::npos));
EXPECT_FALSE(is_type<size_t>::same(""));
// Make sure absl::string_view::npos continues to be a header constant.
char test[absl::string_view::npos & 1] = {0};
EXPECT_EQ(0, test[0]);
}
TEST(StringViewTest, STL1) {
const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
const absl::string_view b("abc");
const absl::string_view c("xyz");
const absl::string_view d("foobar");
const absl::string_view e;
std::string temp("123");
temp += '\0';
temp += "456";
const absl::string_view f(temp);
EXPECT_EQ(a[6], 'g');
EXPECT_EQ(b[0], 'a');
EXPECT_EQ(c[2], 'z');
EXPECT_EQ(f[3], '\0');
EXPECT_EQ(f[5], '5');
EXPECT_EQ(*d.data(), 'f');
EXPECT_EQ(d.data()[5], 'r');
EXPECT_TRUE(e.data() == nullptr);
EXPECT_EQ(*a.begin(), 'a');
EXPECT_EQ(*(b.begin() + 2), 'c');
EXPECT_EQ(*(c.end() - 1), 'z');
EXPECT_EQ(*a.rbegin(), 'z');
EXPECT_EQ(*(b.rbegin() + 2), 'a');
EXPECT_EQ(*(c.rend() - 1), 'x');
EXPECT_TRUE(a.rbegin() + 26 == a.rend());
EXPECT_EQ(a.size(), 26);
EXPECT_EQ(b.size(), 3);
EXPECT_EQ(c.size(), 3);
EXPECT_EQ(d.size(), 6);
EXPECT_EQ(e.size(), 0);
EXPECT_EQ(f.size(), 7);
EXPECT_TRUE(!d.empty());
EXPECT_TRUE(d.begin() != d.end());
EXPECT_TRUE(d.begin() + 6 == d.end());
EXPECT_TRUE(e.empty());
EXPECT_TRUE(e.begin() == e.end());
char buf[4] = { '%', '%', '%', '%' };
EXPECT_EQ(a.copy(buf, 4), 4);
EXPECT_EQ(buf[0], a[0]);
EXPECT_EQ(buf[1], a[1]);
EXPECT_EQ(buf[2], a[2]);
EXPECT_EQ(buf[3], a[3]);
EXPECT_EQ(a.copy(buf, 3, 7), 3);
EXPECT_EQ(buf[0], a[7]);
EXPECT_EQ(buf[1], a[8]);
EXPECT_EQ(buf[2], a[9]);
EXPECT_EQ(buf[3], a[3]);
EXPECT_EQ(c.copy(buf, 99), 3);
EXPECT_EQ(buf[0], c[0]);
EXPECT_EQ(buf[1], c[1]);
EXPECT_EQ(buf[2], c[2]);
EXPECT_EQ(buf[3], a[3]);
}
// Separated from STL1() because some compilers produce an overly
// large stack frame for the combined function.
TEST(StringViewTest, STL2) {
const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
const absl::string_view b("abc");
const absl::string_view c("xyz");
absl::string_view d("foobar");
const absl::string_view e;
const absl::string_view f(
"123"
"\0"
"456",
7);
d = absl::string_view();
EXPECT_EQ(d.size(), 0);
EXPECT_TRUE(d.empty());
EXPECT_TRUE(d.data() == nullptr);
EXPECT_TRUE(d.begin() == d.end());
EXPECT_EQ(a.find(b), 0);
EXPECT_EQ(a.find(b, 1), absl::string_view::npos);
EXPECT_EQ(a.find(c), 23);
EXPECT_EQ(a.find(c, 9), 23);
EXPECT_EQ(a.find(c, absl::string_view::npos), absl::string_view::npos);
EXPECT_EQ(b.find(c), absl::string_view::npos);
EXPECT_EQ(b.find(c, absl::string_view::npos), absl::string_view::npos);
EXPECT_EQ(a.find(d), 0);
EXPECT_EQ(a.find(e), 0);
EXPECT_EQ(a.find(d, 12), 12);
EXPECT_EQ(a.find(e, 17), 17);
absl::string_view g("xx not found bb");
EXPECT_EQ(a.find(g), absl::string_view::npos);
// empty std::string nonsense
EXPECT_EQ(d.find(b), absl::string_view::npos);
EXPECT_EQ(e.find(b), absl::string_view::npos);
EXPECT_EQ(d.find(b, 4), absl::string_view::npos);
EXPECT_EQ(e.find(b, 7), absl::string_view::npos);
size_t empty_search_pos = std::string().find(std::string());
EXPECT_EQ(d.find(d), empty_search_pos);
EXPECT_EQ(d.find(e), empty_search_pos);
EXPECT_EQ(e.find(d), empty_search_pos);
EXPECT_EQ(e.find(e), empty_search_pos);
EXPECT_EQ(d.find(d, 4), std::string().find(std::string(), 4));
EXPECT_EQ(d.find(e, 4), std::string().find(std::string(), 4));
EXPECT_EQ(e.find(d, 4), std::string().find(std::string(), 4));
EXPECT_EQ(e.find(e, 4), std::string().find(std::string(), 4));
EXPECT_EQ(a.find('a'), 0);
EXPECT_EQ(a.find('c'), 2);
EXPECT_EQ(a.find('z'), 25);
EXPECT_EQ(a.find('$'), absl::string_view::npos);
EXPECT_EQ(a.find('\0'), absl::string_view::npos);
EXPECT_EQ(f.find('\0'), 3);
EXPECT_EQ(f.find('3'), 2);
EXPECT_EQ(f.find('5'), 5);
EXPECT_EQ(g.find('o'), 4);
EXPECT_EQ(g.find('o', 4), 4);
EXPECT_EQ(g.find('o', 5), 8);
EXPECT_EQ(a.find('b', 5), absl::string_view::npos);
// empty std::string nonsense
EXPECT_EQ(d.find('\0'), absl::string_view::npos);
EXPECT_EQ(e.find('\0'), absl::string_view::npos);
EXPECT_EQ(d.find('\0', 4), absl::string_view::npos);
EXPECT_EQ(e.find('\0', 7), absl::string_view::npos);
EXPECT_EQ(d.find('x'), absl::string_view::npos);
EXPECT_EQ(e.find('x'), absl::string_view::npos);
EXPECT_EQ(d.find('x', 4), absl::string_view::npos);
EXPECT_EQ(e.find('x', 7), absl::string_view::npos);
EXPECT_EQ(a.rfind(b), 0);
EXPECT_EQ(a.rfind(b, 1), 0);
EXPECT_EQ(a.rfind(c), 23);
EXPECT_EQ(a.rfind(c, 22), absl::string_view::npos);
EXPECT_EQ(a.rfind(c, 1), absl::string_view::npos);
EXPECT_EQ(a.rfind(c, 0), absl::string_view::npos);
EXPECT_EQ(b.rfind(c), absl::string_view::npos);
EXPECT_EQ(b.rfind(c, 0), absl::string_view::npos);
EXPECT_EQ(a.rfind(d), std::string(a).rfind(std::string()));
EXPECT_EQ(a.rfind(e), std::string(a).rfind(std::string()));
EXPECT_EQ(a.rfind(d, 12), 12);
EXPECT_EQ(a.rfind(e, 17), 17);
EXPECT_EQ(a.rfind(g), absl::string_view::npos);
EXPECT_EQ(d.rfind(b), absl::string_view::npos);
EXPECT_EQ(e.rfind(b), absl::string_view::npos);
EXPECT_EQ(d.rfind(b, 4), absl::string_view::npos);
EXPECT_EQ(e.rfind(b, 7), absl::string_view::npos);
// empty std::string nonsense
EXPECT_EQ(d.rfind(d, 4), std::string().rfind(std::string()));
EXPECT_EQ(e.rfind(d, 7), std::string().rfind(std::string()));
EXPECT_EQ(d.rfind(e, 4), std::string().rfind(std::string()));
EXPECT_EQ(e.rfind(e, 7), std::string().rfind(std::string()));
EXPECT_EQ(d.rfind(d), std::string().rfind(std::string()));
EXPECT_EQ(e.rfind(d), std::string().rfind(std::string()));
EXPECT_EQ(d.rfind(e), std::string().rfind(std::string()));
EXPECT_EQ(e.rfind(e), std::string().rfind(std::string()));
EXPECT_EQ(g.rfind('o'), 8);
EXPECT_EQ(g.rfind('q'), absl::string_view::npos);
EXPECT_EQ(g.rfind('o', 8), 8);
EXPECT_EQ(g.rfind('o', 7), 4);
EXPECT_EQ(g.rfind('o', 3), absl::string_view::npos);
EXPECT_EQ(f.rfind('\0'), 3);
EXPECT_EQ(f.rfind('\0', 12), 3);
EXPECT_EQ(f.rfind('3'), 2);
EXPECT_EQ(f.rfind('5'), 5);
// empty std::string nonsense
EXPECT_EQ(d.rfind('o'), absl::string_view::npos);
EXPECT_EQ(e.rfind('o'), absl::string_view::npos);
EXPECT_EQ(d.rfind('o', 4), absl::string_view::npos);
EXPECT_EQ(e.rfind('o', 7), absl::string_view::npos);
}
// Continued from STL2
TEST(StringViewTest, STL2FindFirst) {
const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
const absl::string_view b("abc");
const absl::string_view c("xyz");
absl::string_view d("foobar");
const absl::string_view e;
const absl::string_view f(
"123"
"\0"
"456",
7);
absl::string_view g("xx not found bb");
d = absl::string_view();
EXPECT_EQ(a.find_first_of(b), 0);
EXPECT_EQ(a.find_first_of(b, 0), 0);
EXPECT_EQ(a.find_first_of(b, 1), 1);
EXPECT_EQ(a.find_first_of(b, 2), 2);
EXPECT_EQ(a.find_first_of(b, 3), absl::string_view::npos);
EXPECT_EQ(a.find_first_of(c), 23);
EXPECT_EQ(a.find_first_of(c, 23), 23);
EXPECT_EQ(a.find_first_of(c, 24), 24);
EXPECT_EQ(a.find_first_of(c, 25), 25);
EXPECT_EQ(a.find_first_of(c, 26), absl::string_view::npos);
EXPECT_EQ(g.find_first_of(b), 13);
EXPECT_EQ(g.find_first_of(c), 0);
EXPECT_EQ(a.find_first_of(f), absl::string_view::npos);
EXPECT_EQ(f.find_first_of(a), absl::string_view::npos);
// empty std::string nonsense
EXPECT_EQ(a.find_first_of(d), absl::string_view::npos);
EXPECT_EQ(a.find_first_of(e), absl::string_view::npos);
EXPECT_EQ(d.find_first_of(b), absl::string_view::npos);
EXPECT_EQ(e.find_first_of(b), absl::string_view::npos);
EXPECT_EQ(d.find_first_of(d), absl::string_view::npos);
EXPECT_EQ(e.find_first_of(d), absl::string_view::npos);
EXPECT_EQ(d.find_first_of(e), absl::string_view::npos);
EXPECT_EQ(e.find_first_of(e), absl::string_view::npos);
EXPECT_EQ(a.find_first_not_of(b), 3);
EXPECT_EQ(a.find_first_not_of(c), 0);
EXPECT_EQ(b.find_first_not_of(a), absl::string_view::npos);
EXPECT_EQ(c.find_first_not_of(a), absl::string_view::npos);
EXPECT_EQ(f.find_first_not_of(a), 0);
EXPECT_EQ(a.find_first_not_of(f), 0);
EXPECT_EQ(a.find_first_not_of(d), 0);
EXPECT_EQ(a.find_first_not_of(e), 0);
// empty std::string nonsense
EXPECT_EQ(a.find_first_not_of(d), 0);
EXPECT_EQ(a.find_first_not_of(e), 0);
EXPECT_EQ(a.find_first_not_of(d, 1), 1);
EXPECT_EQ(a.find_first_not_of(e, 1), 1);
EXPECT_EQ(a.find_first_not_of(d, a.size() - 1), a.size() - 1);
EXPECT_EQ(a.find_first_not_of(e, a.size() - 1), a.size() - 1);
EXPECT_EQ(a.find_first_not_of(d, a.size()), absl::string_view::npos);
EXPECT_EQ(a.find_first_not_of(e, a.size()), absl::string_view::npos);
EXPECT_EQ(a.find_first_not_of(d, absl::string_view::npos),
absl::string_view::npos);
EXPECT_EQ(a.find_first_not_of(e, absl::string_view::npos),
absl::string_view::npos);
EXPECT_EQ(d.find_first_not_of(a), absl::string_view::npos);
EXPECT_EQ(e.find_first_not_of(a), absl::string_view::npos);
EXPECT_EQ(d.find_first_not_of(d), absl::string_view::npos);
EXPECT_EQ(e.find_first_not_of(d), absl::string_view::npos);
EXPECT_EQ(d.find_first_not_of(e), absl::string_view::npos);
EXPECT_EQ(e.find_first_not_of(e), absl::string_view::npos);
absl::string_view h("====");
EXPECT_EQ(h.find_first_not_of('='), absl::string_view::npos);
EXPECT_EQ(h.find_first_not_of('=', 3), absl::string_view::npos);
EXPECT_EQ(h.find_first_not_of('\0'), 0);
EXPECT_EQ(g.find_first_not_of('x'), 2);
EXPECT_EQ(f.find_first_not_of('\0'), 0);
EXPECT_EQ(f.find_first_not_of('\0', 3), 4);
EXPECT_EQ(f.find_first_not_of('\0', 2), 2);
// empty std::string nonsense
EXPECT_EQ(d.find_first_not_of('x'), absl::string_view::npos);
EXPECT_EQ(e.find_first_not_of('x'), absl::string_view::npos);
EXPECT_EQ(d.find_first_not_of('\0'), absl::string_view::npos);
EXPECT_EQ(e.find_first_not_of('\0'), absl::string_view::npos);
}
// Continued from STL2
TEST(StringViewTest, STL2FindLast) {
const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
const absl::string_view b("abc");
const absl::string_view c("xyz");
absl::string_view d("foobar");
const absl::string_view e;
const absl::string_view f(
"123"
"\0"
"456",
7);
absl::string_view g("xx not found bb");
absl::string_view h("====");
absl::string_view i("56");
d = absl::string_view();
EXPECT_EQ(h.find_last_of(a), absl::string_view::npos);
EXPECT_EQ(g.find_last_of(a), g.size()-1);
EXPECT_EQ(a.find_last_of(b), 2);
EXPECT_EQ(a.find_last_of(c), a.size()-1);
EXPECT_EQ(f.find_last_of(i), 6);
EXPECT_EQ(a.find_last_of('a'), 0);
EXPECT_EQ(a.find_last_of('b'), 1);
EXPECT_EQ(a.find_last_of('z'), 25);
EXPECT_EQ(a.find_last_of('a', 5), 0);
EXPECT_EQ(a.find_last_of('b', 5), 1);
EXPECT_EQ(a.find_last_of('b', 0), absl::string_view::npos);
EXPECT_EQ(a.find_last_of('z', 25), 25);
EXPECT_EQ(a.find_last_of('z', 24), absl::string_view::npos);
EXPECT_EQ(f.find_last_of(i, 5), 5);
EXPECT_EQ(f.find_last_of(i, 6), 6);
EXPECT_EQ(f.find_last_of(a, 4), absl::string_view::npos);
// empty std::string nonsense
EXPECT_EQ(f.find_last_of(d), absl::string_view::npos);
EXPECT_EQ(f.find_last_of(e), absl::string_view::npos);
EXPECT_EQ(f.find_last_of(d, 4), absl::string_view::npos);
EXPECT_EQ(f.find_last_of(e, 4), absl::string_view::npos);
EXPECT_EQ(d.find_last_of(d), absl::string_view::npos);
EXPECT_EQ(d.find_last_of(e), absl::string_view::npos);
EXPECT_EQ(e.find_last_of(d), absl::string_view::npos);
EXPECT_EQ(e.find_last_of(e), absl::string_view::npos);
EXPECT_EQ(d.find_last_of(f), absl::string_view::npos);
EXPECT_EQ(e.find_last_of(f), absl::string_view::npos);
EXPECT_EQ(d.find_last_of(d, 4), absl::string_view::npos);
EXPECT_EQ(d.find_last_of(e, 4), absl::string_view::npos);
EXPECT_EQ(e.find_last_of(d, 4), absl::string_view::npos);
EXPECT_EQ(e.find_last_of(e, 4), absl::string_view::npos);
EXPECT_EQ(d.find_last_of(f, 4), absl::string_view::npos);
EXPECT_EQ(e.find_last_of(f, 4), absl::string_view::npos);
EXPECT_EQ(a.find_last_not_of(b), a.size()-1);
EXPECT_EQ(a.find_last_not_of(c), 22);
EXPECT_EQ(b.find_last_not_of(a), absl::string_view::npos);
EXPECT_EQ(b.find_last_not_of(b), absl::string_view::npos);
EXPECT_EQ(f.find_last_not_of(i), 4);
EXPECT_EQ(a.find_last_not_of(c, 24), 22);
EXPECT_EQ(a.find_last_not_of(b, 3), 3);
EXPECT_EQ(a.find_last_not_of(b, 2), absl::string_view::npos);
// empty std::string nonsense
EXPECT_EQ(f.find_last_not_of(d), f.size()-1);
EXPECT_EQ(f.find_last_not_of(e), f.size()-1);
EXPECT_EQ(f.find_last_not_of(d, 4), 4);
EXPECT_EQ(f.find_last_not_of(e, 4), 4);
EXPECT_EQ(d.find_last_not_of(d), absl::string_view::npos);
EXPECT_EQ(d.find_last_not_of(e), absl::string_view::npos);
EXPECT_EQ(e.find_last_not_of(d), absl::string_view::npos);
EXPECT_EQ(e.find_last_not_of(e), absl::string_view::npos);
EXPECT_EQ(d.find_last_not_of(f), absl::string_view::npos);
EXPECT_EQ(e.find_last_not_of(f), absl::string_view::npos);
EXPECT_EQ(d.find_last_not_of(d, 4), absl::string_view::npos);
EXPECT_EQ(d.find_last_not_of(e, 4), absl::string_view::npos);
EXPECT_EQ(e.find_last_not_of(d, 4), absl::string_view::npos);
EXPECT_EQ(e.find_last_not_of(e, 4), absl::string_view::npos);
EXPECT_EQ(d.find_last_not_of(f, 4), absl::string_view::npos);
EXPECT_EQ(e.find_last_not_of(f, 4), absl::string_view::npos);
EXPECT_EQ(h.find_last_not_of('x'), h.size() - 1);
EXPECT_EQ(h.find_last_not_of('='), absl::string_view::npos);
EXPECT_EQ(b.find_last_not_of('c'), 1);
EXPECT_EQ(h.find_last_not_of('x', 2), 2);
EXPECT_EQ(h.find_last_not_of('=', 2), absl::string_view::npos);
EXPECT_EQ(b.find_last_not_of('b', 1), 0);
// empty std::string nonsense
EXPECT_EQ(d.find_last_not_of('x'), absl::string_view::npos);
EXPECT_EQ(e.find_last_not_of('x'), absl::string_view::npos);
EXPECT_EQ(d.find_last_not_of('\0'), absl::string_view::npos);
EXPECT_EQ(e.find_last_not_of('\0'), absl::string_view::npos);
}
// Continued from STL2
TEST(StringViewTest, STL2Substr) {
const absl::string_view a("abcdefghijklmnopqrstuvwxyz");
const absl::string_view b("abc");
const absl::string_view c("xyz");
absl::string_view d("foobar");
const absl::string_view e;
d = absl::string_view();
EXPECT_EQ(a.substr(0, 3), b);
EXPECT_EQ(a.substr(23), c);
EXPECT_EQ(a.substr(23, 3), c);
EXPECT_EQ(a.substr(23, 99), c);
EXPECT_EQ(a.substr(0), a);
EXPECT_EQ(a.substr(3, 2), "de");
// empty std::string nonsense
EXPECT_EQ(d.substr(0, 99), e);
// use of npos
EXPECT_EQ(a.substr(0, absl::string_view::npos), a);
EXPECT_EQ(a.substr(23, absl::string_view::npos), c);
// throw exception
#ifdef ABSL_HAVE_EXCEPTIONS
EXPECT_THROW((void)a.substr(99, 2), std::out_of_range);
#else
EXPECT_DEATH((void)a.substr(99, 2), "absl::string_view::substr");
#endif
}
TEST(StringViewTest, TruncSubstr) {
const absl::string_view hi("hi");
EXPECT_EQ("", absl::ClippedSubstr(hi, 0, 0));
EXPECT_EQ("h", absl::ClippedSubstr(hi, 0, 1));
EXPECT_EQ("hi", absl::ClippedSubstr(hi, 0));
EXPECT_EQ("i", absl::ClippedSubstr(hi, 1));
EXPECT_EQ("", absl::ClippedSubstr(hi, 2));
EXPECT_EQ("", absl::ClippedSubstr(hi, 3)); // truncation
EXPECT_EQ("", absl::ClippedSubstr(hi, 3, 2)); // truncation
}
TEST(StringViewTest, UTF8) {
std::string utf8 = "\u00E1";
std::string utf8_twice = utf8 + " " + utf8;
int utf8_len = strlen(utf8.data());
EXPECT_EQ(utf8_len, absl::string_view(utf8_twice).find_first_of(" "));
EXPECT_EQ(utf8_len, absl::string_view(utf8_twice).find_first_of(" \t"));
}
TEST(StringViewTest, FindConformance) {
struct {
std::string haystack;
std::string needle;
} specs[] = {
{"", ""},
{"", "a"},
{"a", ""},
{"a", "a"},
{"a", "b"},
{"aa", ""},
{"aa", "a"},
{"aa", "b"},
{"ab", "a"},
{"ab", "b"},
{"abcd", ""},
{"abcd", "a"},
{"abcd", "d"},
{"abcd", "ab"},
{"abcd", "bc"},
{"abcd", "cd"},
{"abcd", "abcd"},
};
for (const auto& s : specs) {
SCOPED_TRACE(s.haystack);
SCOPED_TRACE(s.needle);
std::string st = s.haystack;
absl::string_view sp = s.haystack;
for (size_t i = 0; i <= sp.size(); ++i) {
size_t pos = (i == sp.size()) ? absl::string_view::npos : i;
SCOPED_TRACE(pos);
EXPECT_EQ(sp.find(s.needle, pos),
st.find(s.needle, pos));
EXPECT_EQ(sp.rfind(s.needle, pos),
st.rfind(s.needle, pos));
EXPECT_EQ(sp.find_first_of(s.needle, pos),
st.find_first_of(s.needle, pos));
EXPECT_EQ(sp.find_first_not_of(s.needle, pos),
st.find_first_not_of(s.needle, pos));
EXPECT_EQ(sp.find_last_of(s.needle, pos),
st.find_last_of(s.needle, pos));
EXPECT_EQ(sp.find_last_not_of(s.needle, pos),
st.find_last_not_of(s.needle, pos));
}
}
}
TEST(StringViewTest, Remove) {
absl::string_view a("foobar");
std::string s1("123");
s1 += '\0';
s1 += "456";
absl::string_view b(s1);
absl::string_view e;
std::string s2;
// remove_prefix
absl::string_view c(a);
c.remove_prefix(3);
EXPECT_EQ(c, "bar");
c = a;
c.remove_prefix(0);
EXPECT_EQ(c, a);
c.remove_prefix(c.size());
EXPECT_EQ(c, e);
// remove_suffix
c = a;
c.remove_suffix(3);
EXPECT_EQ(c, "foo");
c = a;
c.remove_suffix(0);
EXPECT_EQ(c, a);
c.remove_suffix(c.size());
EXPECT_EQ(c, e);
}
TEST(StringViewTest, Set) {
absl::string_view a("foobar");
absl::string_view empty;
absl::string_view b;
// set
b = absl::string_view("foobar", 6);
EXPECT_EQ(b, a);
b = absl::string_view("foobar", 0);
EXPECT_EQ(b, empty);
b = absl::string_view("foobar", 7);
EXPECT_NE(b, a);
b = absl::string_view("foobar");
EXPECT_EQ(b, a);
}
TEST(StringViewTest, FrontBack) {
static const char arr[] = "abcd";
const absl::string_view csp(arr, 4);
EXPECT_EQ(&arr[0], &csp.front());
EXPECT_EQ(&arr[3], &csp.back());
}
TEST(StringViewTest, FrontBackSingleChar) {
static const char c = 'a';
const absl::string_view csp(&c, 1);
EXPECT_EQ(&c, &csp.front());
EXPECT_EQ(&c, &csp.back());
}
// `std::string_view::string_view(const char*)` calls
// `std::char_traits<char>::length(const char*)` to get the string length. In
// libc++, it doesn't allow `nullptr` in the constexpr context, with the error
// "read of dereferenced null pointer is not allowed in a constant expression".
// At run time, the behavior of `std::char_traits::length()` on `nullptr` is
// undefined by the standard and usually results in crash with libc++.
// In MSVC, creating a constexpr string_view from nullptr also triggers an
// "unevaluable pointer value" error. This compiler implementation conforms
// to the standard, but `absl::string_view` implements a different
// behavior for historical reasons. We work around tests that construct
// `string_view` from `nullptr` when using libc++.
#if !defined(ABSL_HAVE_STD_STRING_VIEW) || \
(!defined(_LIBCPP_VERSION) && !defined(_MSC_VER))
#define ABSL_HAVE_STRING_VIEW_FROM_NULLPTR 1
#endif // !defined(ABSL_HAVE_STD_STRING_VIEW) || !defined(_LIBCPP_VERSION)
TEST(StringViewTest, NULLInput) {
absl::string_view s;
EXPECT_EQ(s.data(), nullptr);
EXPECT_EQ(s.size(), 0);
#ifdef ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
s = absl::string_view(nullptr);
EXPECT_EQ(s.data(), nullptr);
EXPECT_EQ(s.size(), 0);
// .ToString() on a absl::string_view with nullptr should produce the empty
// std::string.
EXPECT_EQ("", std::string(s));
#endif // ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
}
TEST(StringViewTest, Comparisons2) {
// The `compare` member has 6 overloads (v: string_view, s: const char*):
// (1) compare(v)
// (2) compare(pos1, count1, v)
// (3) compare(pos1, count1, v, pos2, count2)
// (4) compare(s)
// (5) compare(pos1, count1, s)
// (6) compare(pos1, count1, s, count2)
absl::string_view abc("abcdefghijklmnopqrstuvwxyz");
// check comparison operations on strings longer than 4 bytes.
EXPECT_EQ(abc, absl::string_view("abcdefghijklmnopqrstuvwxyz"));
EXPECT_EQ(abc.compare(absl::string_view("abcdefghijklmnopqrstuvwxyz")), 0);
EXPECT_LT(abc, absl::string_view("abcdefghijklmnopqrstuvwxzz"));
EXPECT_LT(abc.compare(absl::string_view("abcdefghijklmnopqrstuvwxzz")), 0);
EXPECT_GT(abc, absl::string_view("abcdefghijklmnopqrstuvwxyy"));
EXPECT_GT(abc.compare(absl::string_view("abcdefghijklmnopqrstuvwxyy")), 0);
// The "substr" variants of `compare`.
absl::string_view digits("0123456789");
auto npos = absl::string_view::npos;
// Taking string_view
EXPECT_EQ(digits.compare(3, npos, absl::string_view("3456789")), 0); // 2
EXPECT_EQ(digits.compare(3, 4, absl::string_view("3456")), 0); // 2
EXPECT_EQ(digits.compare(10, 0, absl::string_view()), 0); // 2
EXPECT_EQ(digits.compare(3, 4, absl::string_view("0123456789"), 3, 4),
0); // 3
EXPECT_LT(digits.compare(3, 4, absl::string_view("0123456789"), 3, 5),
0); // 3
EXPECT_LT(digits.compare(0, npos, absl::string_view("0123456789"), 3, 5),
0); // 3
// Taking const char*
EXPECT_EQ(digits.compare(3, 4, "3456"), 0); // 5
EXPECT_EQ(digits.compare(3, npos, "3456789"), 0); // 5
EXPECT_EQ(digits.compare(10, 0, ""), 0); // 5
EXPECT_EQ(digits.compare(3, 4, "0123456789", 3, 4), 0); // 6
EXPECT_LT(digits.compare(3, 4, "0123456789", 3, 5), 0); // 6
EXPECT_LT(digits.compare(0, npos, "0123456789", 3, 5), 0); // 6
}
struct MyCharAlloc : std::allocator<char> {};
TEST(StringViewTest, ExplicitConversionOperator) {
absl::string_view sp = "hi";
EXPECT_EQ(sp, std::string(sp));
}
TEST(StringViewTest, NullSafeStringView) {
{
absl::string_view s = absl::NullSafeStringView(nullptr);
EXPECT_EQ(nullptr, s.data());
EXPECT_EQ(0, s.size());
EXPECT_EQ(absl::string_view(), s);
}
{
static const char kHi[] = "hi";
absl::string_view s = absl::NullSafeStringView(kHi);
EXPECT_EQ(kHi, s.data());
EXPECT_EQ(strlen(kHi), s.size());
EXPECT_EQ(absl::string_view("hi"), s);
}
}
TEST(StringViewTest, ConstexprCompiles) {
constexpr absl::string_view sp;
#ifdef ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
constexpr absl::string_view cstr(nullptr);
#endif
constexpr absl::string_view cstr_len("cstr", 4);
#if defined(ABSL_HAVE_STD_STRING_VIEW)
// In libstdc++ (as of 7.2), `std::string_view::string_view(const char*)`
// calls `std::char_traits<char>::length(const char*)` to get the std::string
// length, but it is not marked constexpr yet. See GCC bug:
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78156
// Also, there is a LWG issue that adds constexpr to length() which was just
// resolved 2017-06-02. See
// http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2232
// TODO(zhangxy): Update the condition when libstdc++ adopts the constexpr
// length().
#if !defined(__GLIBCXX__)
#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1
#endif // !__GLIBCXX__
#else // ABSL_HAVE_STD_STRING_VIEW
// This duplicates the check for __builtin_strlen in the header.
#if ABSL_HAVE_BUILTIN(__builtin_strlen) || \
(defined(__GNUC__) && !defined(__clang__))
#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1
#elif defined(__GNUC__) // GCC or clang
#error GCC/clang should have constexpr string_view.
#endif
#endif // ABSL_HAVE_STD_STRING_VIEW
#ifdef ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR
constexpr absl::string_view cstr_strlen("foo");
EXPECT_EQ(cstr_strlen.length(), 3);
constexpr absl::string_view cstr_strlen2 = "bar";
EXPECT_EQ(cstr_strlen2, "bar");
#endif
#if !defined(__clang__) || 3 < __clang_major__ || \
(3 == __clang_major__ && 4 < __clang_minor__)
// older clang versions (< 3.5) complain that:
// "cannot perform pointer arithmetic on null pointer"
constexpr absl::string_view::iterator const_begin_empty = sp.begin();
constexpr absl::string_view::iterator const_end_empty = sp.end();
EXPECT_EQ(const_begin_empty, const_end_empty);
#ifdef ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
constexpr absl::string_view::iterator const_begin_nullptr = cstr.begin();
constexpr absl::string_view::iterator const_end_nullptr = cstr.end();
EXPECT_EQ(const_begin_nullptr, const_end_nullptr);
#endif // ABSL_HAVE_STRING_VIEW_FROM_NULLPTR
#endif // !defined(__clang__) || ...
constexpr absl::string_view::iterator const_begin = cstr_len.begin();
constexpr absl::string_view::iterator const_end = cstr_len.end();
constexpr absl::string_view::size_type const_size = cstr_len.size();
constexpr absl::string_view::size_type const_length = cstr_len.length();
EXPECT_EQ(const_begin + const_size, const_end);
EXPECT_EQ(const_begin + const_length, const_end);
constexpr bool isempty = sp.empty();
EXPECT_TRUE(isempty);
constexpr const char c = cstr_len[2];
EXPECT_EQ(c, 't');
constexpr const char cfront = cstr_len.front();
constexpr const char cback = cstr_len.back();
EXPECT_EQ(cfront, 'c');
EXPECT_EQ(cback, 'r');
constexpr const char* np = sp.data();
constexpr const char* cstr_ptr = cstr_len.data();
EXPECT_EQ(np, nullptr);
EXPECT_NE(cstr_ptr, nullptr);
constexpr size_t sp_npos = sp.npos;
EXPECT_EQ(sp_npos, -1);
}
TEST(StringViewTest, Noexcept) {
EXPECT_TRUE((std::is_nothrow_constructible<absl::string_view,
const std::string&>::value));
EXPECT_TRUE(
(std::is_nothrow_constructible<absl::string_view, const std::string&>::value));
EXPECT_TRUE(std::is_nothrow_constructible<absl::string_view>::value);
constexpr absl::string_view sp;
EXPECT_TRUE(noexcept(sp.begin()));
EXPECT_TRUE(noexcept(sp.end()));
EXPECT_TRUE(noexcept(sp.cbegin()));
EXPECT_TRUE(noexcept(sp.cend()));
EXPECT_TRUE(noexcept(sp.rbegin()));
EXPECT_TRUE(noexcept(sp.rend()));
EXPECT_TRUE(noexcept(sp.crbegin()));
EXPECT_TRUE(noexcept(sp.crend()));
EXPECT_TRUE(noexcept(sp.size()));
EXPECT_TRUE(noexcept(sp.length()));
EXPECT_TRUE(noexcept(sp.empty()));
EXPECT_TRUE(noexcept(sp.data()));
EXPECT_TRUE(noexcept(sp.compare(sp)));
EXPECT_TRUE(noexcept(sp.find(sp)));
EXPECT_TRUE(noexcept(sp.find('f')));
EXPECT_TRUE(noexcept(sp.rfind(sp)));
EXPECT_TRUE(noexcept(sp.rfind('f')));
EXPECT_TRUE(noexcept(sp.find_first_of(sp)));
EXPECT_TRUE(noexcept(sp.find_first_of('f')));
EXPECT_TRUE(noexcept(sp.find_last_of(sp)));
EXPECT_TRUE(noexcept(sp.find_last_of('f')));
EXPECT_TRUE(noexcept(sp.find_first_not_of(sp)));
EXPECT_TRUE(noexcept(sp.find_first_not_of('f')));
EXPECT_TRUE(noexcept(sp.find_last_not_of(sp)));
EXPECT_TRUE(noexcept(sp.find_last_not_of('f')));
}
TEST(ComparisonOpsTest, StringCompareNotAmbiguous) {
EXPECT_EQ("hello", std::string("hello"));
EXPECT_LT("hello", std::string("world"));
}
TEST(ComparisonOpsTest, HeterogenousStringViewEquals) {
EXPECT_EQ(absl::string_view("hello"), std::string("hello"));
EXPECT_EQ("hello", absl::string_view("hello"));
}
TEST(FindOneCharTest, EdgeCases) {
absl::string_view a("xxyyyxx");
// Set a = "xyyyx".
a.remove_prefix(1);
a.remove_suffix(1);
EXPECT_EQ(0, a.find('x'));
EXPECT_EQ(0, a.find('x', 0));
EXPECT_EQ(4, a.find('x', 1));
EXPECT_EQ(4, a.find('x', 4));
EXPECT_EQ(absl::string_view::npos, a.find('x', 5));
EXPECT_EQ(4, a.rfind('x'));
EXPECT_EQ(4, a.rfind('x', 5));
EXPECT_EQ(4, a.rfind('x', 4));
EXPECT_EQ(0, a.rfind('x', 3));
EXPECT_EQ(0, a.rfind('x', 0));
// Set a = "yyy".
a.remove_prefix(1);
a.remove_suffix(1);
EXPECT_EQ(absl::string_view::npos, a.find('x'));
EXPECT_EQ(absl::string_view::npos, a.rfind('x'));
}
#ifndef THREAD_SANITIZER // Allocates too much memory for tsan.
TEST(HugeStringView, TwoPointTwoGB) {
if (sizeof(size_t) <= 4 || RunningOnValgrind())
return;
// Try a huge std::string piece.
const size_t size = size_t{2200} * 1000 * 1000;
std::string s(size, 'a');
absl::string_view sp(s);
EXPECT_EQ(size, sp.length());
sp.remove_prefix(1);
EXPECT_EQ(size - 1, sp.length());
sp.remove_suffix(2);
EXPECT_EQ(size - 1 - 2, sp.length());
}
#endif // THREAD_SANITIZER
#if !defined(NDEBUG) && !defined(ABSL_HAVE_STD_STRING_VIEW)
TEST(NonNegativeLenTest, NonNegativeLen) {
ABSL_EXPECT_DEATH_IF_SUPPORTED(absl::string_view("xyz", -1),
"len <= kMaxSize");
}
TEST(LenExceedsMaxSizeTest, LenExceedsMaxSize) {
auto max_size = absl::string_view().max_size();
// This should construct ok (although the view itself is obviously invalid).
absl::string_view ok_view("", max_size);
// Adding one to the max should trigger an assertion.
ABSL_EXPECT_DEATH_IF_SUPPORTED(absl::string_view("", max_size + 1),
"len <= kMaxSize");
}
#endif // !defined(NDEBUG) && !defined(ABSL_HAVE_STD_STRING_VIEW)
class StringViewStreamTest : public ::testing::Test {
public:
// Set negative 'width' for right justification.
template <typename T>
std::string Pad(const T& s, int width, char fill = 0) {
std::ostringstream oss;
if (fill != 0) {
oss << std::setfill(fill);
}
if (width < 0) {
width = -width;
oss << std::right;
}
oss << std::setw(width) << s;
return oss.str();
}
};
TEST_F(StringViewStreamTest, Padding) {
std::string s("hello");
absl::string_view sp(s);
for (int w = -64; w < 64; ++w) {
SCOPED_TRACE(w);
EXPECT_EQ(Pad(s, w), Pad(sp, w));
}
for (int w = -64; w < 64; ++w) {
SCOPED_TRACE(w);
EXPECT_EQ(Pad(s, w, '#'), Pad(sp, w, '#'));
}
}
TEST_F(StringViewStreamTest, ResetsWidth) {
// Width should reset after one formatted write.
// If we weren't resetting width after formatting the string_view,
// we'd have width=5 carrying over to the printing of the "]",
// creating "[###hi####]".
std::string s = "hi";
absl::string_view sp = s;
{
std::ostringstream oss;
oss << "[" << std::setfill('#') << std::setw(5) << s << "]";
ASSERT_EQ("[###hi]", oss.str());
}
{
std::ostringstream oss;
oss << "[" << std::setfill('#') << std::setw(5) << sp << "]";
EXPECT_EQ("[###hi]", oss.str());
}
}
} // namespace