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tvl-depot/absl/strings/string_view_test.cc
Abseil Team 518f17501e Export of internal Abseil changes 
--
79913a12f0cad4baf948430315aabf53f03b6475 by Abseil Team <absl-team@google.com>:

Don't inline (Un)LockSlow.

PiperOrigin-RevId: 302502344

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6b340e80f0690655f24799c8de6707b3a95b8579 by Derek Mauro <dmauro@google.com>:

Add hardening assertions to absl::optional's dereference operators

PiperOrigin-RevId: 302492862

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a9951bf4852d8c1aec472cb4b539830411270e4c by Derek Mauro <dmauro@google.com>:

Correctly add hardware AES compiler flags under Linux X86-64
Fixes #643

PiperOrigin-RevId: 302490673

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314c3621ee4d57b6bc8d64338a1f1d48a69741d1 by Derek Mauro <dmauro@google.com>:

Upgrade to hardening assertions in absl::Span::remove_prefix and absl::Span::remove_suffix

PiperOrigin-RevId: 302481191

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a142b8c6c62705c5f0d4fe3113150f0c0b7822b9 by Derek Mauro <dmauro@google.com>:

Update docker containers to Bazel 2.2.0, GCC 9.3, and new Clang snapshot

PiperOrigin-RevId: 302454042

--
afedeb70a2adc87010030c9ba6f06fe35ec26407 by Derek Mauro <dmauro@google.com>:

Add hardening assertions for the preconditions of absl::FixedArray

PiperOrigin-RevId: 302441767

--
44442bfbc0a9a742df32f07cee86a47712efb8b4 by Derek Mauro <dmauro@google.com>:

Fix new Clang warning about SpinLock doing operations on enums of different types

PiperOrigin-RevId: 302430387

--
69eaff7f97231779f696321c2ba8b88debf6dd9e by Derek Mauro <dmauro@google.com>:

Convert precondition assertions to ABSL_HARDENING_ASSERT for
absl::InlinedVector

PiperOrigin-RevId: 302427894

--
26b6db906a0942fd18583dc2cdd1bab32919d964 by Gennadiy Rozental <rogeeff@google.com>:

Internal change

PiperOrigin-RevId: 302425283

--
e62e81422979e922505d2cd9000e1de58123c088 by Derek Mauro <dmauro@google.com>:

Add an option to build Abseil in hardened mode

In hardened mode, the ABSL_HARDENING_ASSERT() macro is active even
when NDEBUG is defined. This allows Abseil to perform runtime checks
even in release mode. This should be used to implement things like
bounds checks that could otherwise lead to security vulnerabilities.

Use the new assertion in absl::string_view and absl::Span to test it.

PiperOrigin-RevId: 302119187
GitOrigin-RevId: 79913a12f0cad4baf948430315aabf53f03b6475
Change-Id: I0cc3341fd333a1df313167bab72dc5a759c4a048
2020-03-23 16:24:45 -04:00

1264 lines
41 KiB
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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"
#include "absl/base/options.h"
#if defined(ABSL_HAVE_STD_STRING_VIEW) || defined(__ANDROID__)
// We don't control the death messaging when using std::string_view.
// 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
ABSL_EXPECT_DEATH_IF_SUPPORTED(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 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 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 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 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 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 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 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 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 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 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 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
ABSL_EXPECT_DEATH_IF_SUPPORTED((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());
}
TEST(StringViewTest, FrontBackEmpty) {
#ifndef ABSL_USES_STD_STRING_VIEW
#if !defined(NDEBUG) || ABSL_OPTION_HARDENED
// Abseil's string_view implementation has debug assertions that check that
// front() and back() are not called on an empty string_view.
absl::string_view sv;
ABSL_EXPECT_DEATH_IF_SUPPORTED(sv.front(), "");
ABSL_EXPECT_DEATH_IF_SUPPORTED(sv.back(), "");
#endif
#endif
}
// `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_USES_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
// 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
}
TEST(StringViewTest, At) {
absl::string_view abc = "abc";
EXPECT_EQ(abc.at(0), 'a');
EXPECT_EQ(abc.at(1), 'b');
EXPECT_EQ(abc.at(2), 'c');
#ifdef ABSL_HAVE_EXCEPTIONS
EXPECT_THROW(abc.at(3), std::out_of_range);
#else
ABSL_EXPECT_DEATH_IF_SUPPORTED(abc.at(3), "absl::string_view::at");
#endif
}
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, ConstexprNullSafeStringView) {
{
constexpr absl::string_view s = absl::NullSafeStringView(nullptr);
EXPECT_EQ(nullptr, s.data());
EXPECT_EQ(0, s.size());
EXPECT_EQ(absl::string_view(), s);
}
#if !defined(_MSC_VER) || _MSC_VER >= 1910
// MSVC 2017+ is required for good constexpr string_view support.
// See the implementation of `absl::string_view::StrlenInternal()`.
{
static constexpr 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);
}
{
constexpr absl::string_view s = absl::NullSafeStringView("hello");
EXPECT_EQ(s.size(), 5);
EXPECT_EQ("hello", s);
}
#endif
}
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_USES_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 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_USES_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_USES_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");
#if ABSL_HAVE_BUILTIN(__builtin_memcmp) || \
(defined(__GNUC__) && !defined(__clang__))
#define ABSL_HAVE_CONSTEXPR_STRING_VIEW_COMPARISON 1
#endif
#ifdef ABSL_HAVE_CONSTEXPR_STRING_VIEW_COMPARISON
constexpr absl::string_view foo = "foo";
constexpr absl::string_view bar = "bar";
constexpr bool foo_eq_bar = foo == bar;
constexpr bool foo_ne_bar = foo != bar;
constexpr bool foo_lt_bar = foo < bar;
constexpr bool foo_le_bar = foo <= bar;
constexpr bool foo_gt_bar = foo > bar;
constexpr bool foo_ge_bar = foo >= bar;
constexpr int foo_compare_bar = foo.compare(bar);
EXPECT_FALSE(foo_eq_bar);
EXPECT_TRUE(foo_ne_bar);
EXPECT_FALSE(foo_lt_bar);
EXPECT_FALSE(foo_le_bar);
EXPECT_TRUE(foo_gt_bar);
EXPECT_TRUE(foo_ge_bar);
EXPECT_GT(foo_compare_bar, 0);
#endif
#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, ConstexprSubstr) {
constexpr absl::string_view foobar("foobar", 6);
constexpr absl::string_view foo = foobar.substr(0, 3);
constexpr absl::string_view bar = foobar.substr(3);
EXPECT_EQ(foo, "foo");
EXPECT_EQ(bar, "bar");
}
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(StringViewTest, BoundsCheck) {
#ifndef ABSL_USES_STD_STRING_VIEW
#if !defined(NDEBUG) || ABSL_OPTION_HARDENED
// Abseil's string_view implementation has bounds-checking in debug mode.
absl::string_view h = "hello";
ABSL_EXPECT_DEATH_IF_SUPPORTED(h[5], "");
ABSL_EXPECT_DEATH_IF_SUPPORTED(h[-1], "");
#endif
#endif
}
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 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_USES_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_USES_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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