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tvl-depot/absl/strings/string_view_test.cc
Abseil Team 0e7afdcbd2 Export of internal Abseil changes 
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62058c9c008e23c787f35c1a5fe05851046a71f1 by Abseil Team <absl-team@google.com>:

Fix some strange usage of INSTANTIATE_TEST_SUITE_P

PiperOrigin-RevId: 264185105

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4400d84027d86415a2f9b81996ff22e7fd7aa30f by Derek Mauro <dmauro@google.com>:

Disable testing std::string_view from nullptr on GCC >= GCC9.

PiperOrigin-RevId: 264150587

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656d5a742ba48d025589709fad33ddae4b02c620 by Matt Calabrese <calabrese@google.com>:

Fix `absl::any_cast` such that it properly works with qualifications.

PiperOrigin-RevId: 263843429

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6ec89214a4ef2170bf069623a56ffd22863b748d by Abseil Team <absl-team@google.com>:

Use macros to enable inline constexpr variables in compare.h when the compiler supports the feature.

PiperOrigin-RevId: 263790677

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a5171e0897195a0367fc08abce9504f813d027ff by Derek Mauro <dmauro@google.com>:

Add the Apache License to files that are missing it.

PiperOrigin-RevId: 263774164

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19e09a7ce8a0aac0a7d534e1799e4d73b63a1bb5 by Abseil Team <absl-team@google.com>:

Update iter.position when moving up the tree in rebalance_after_delete.

This field isn't read after the first iteration in rebalance_after_delete, and I think it's not a correctness issue, but it is read in try_merge_or_rebalance and potentially affects rebalancing decisions so it can affect performance. There's also an extremely unlikely potential for undefined behavior due to signed integer overflow since this field is only ever incremented in try_merge_or_rebalance (and position is an int). Basically though, I just don't think it makes sense to have this invalid iterator floating around here.

PiperOrigin-RevId: 263770305
GitOrigin-RevId: 62058c9c008e23c787f35c1a5fe05851046a71f1
Change-Id: I1e2fb7cbfac7507dddedd181414ee35a5778f8f5
2019-08-19 15:34:07 -04:00

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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
//
// https://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 std::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]);
#ifdef ABSL_HAVE_EXCEPTIONS
EXPECT_THROW(a.copy(buf, 1, 27), std::out_of_range);
#else
EXPECT_DEATH(a.copy(buf, 1, 27), "absl::string_view::copy");
#endif
}
// 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 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++.
// GCC also started rejected this in libstdc++ starting in GCC9.
// 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(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE >= 9) && \
!defined(_LIBCPP_VERSION) && !defined(_MSC_VER))
#define ABSL_HAVE_STRING_VIEW_FROM_NULLPTR 1
#endif
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
// MSVC 2017+ should be able to construct a constexpr string_view from a cstr.
#if defined(_MSC_VER) && _MSC_VER >= 1910
#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1
#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();
static_assert(const_begin + const_size == const_end,
"pointer arithmetic check");
static_assert(const_begin + const_length == const_end,
"pointer arithmetic check");
#ifndef _MSC_VER
// MSVC has bugs doing constexpr pointer arithmetic.
// https://developercommunity.visualstudio.com/content/problem/482192/bad-pointer-arithmetic-in-constepxr-2019-rc1-svc1.html
EXPECT_EQ(const_begin + const_size, const_end);
EXPECT_EQ(const_begin + const_length, const_end);
#endif
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
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