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Diffstat (limited to 'absl/strings/string_view_test.cc')
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diff --git a/absl/strings/string_view_test.cc b/absl/strings/string_view_test.cc new file mode 100644 index 000000000000..439d6499730e --- /dev/null +++ b/absl/strings/string_view_test.cc @@ -0,0 +1,1097 @@ +// 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 <algorithm> +#include <iomanip> +#include <iterator> +#include <map> +#include <random> +#include <sstream> +#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/port.h" + +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; + + 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]); +} + +// 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(a.substr(99, 2), std::out_of_range); +#else + EXPECT_DEATH(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) { + EXPECT_EQ(strlen("á"), absl::string_view("á á").find_first_of(" ")); + EXPECT_EQ(strlen("á"), absl::string_view("á á").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()); +} + +TEST(StringViewTest, NULLInput) { + absl::string_view s; + EXPECT_EQ(s.data(), nullptr); + EXPECT_EQ(s.size(), 0); + + 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)); +} + +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; + constexpr absl::string_view cstr(nullptr); + 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); +#endif + + 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 + +#ifndef NDEBUG +TEST(NonNegativeLenTest, NonNegativeLen) { + EXPECT_DEATH_IF_SUPPORTED(absl::string_view("xyz", -1), "len <= kMaxSize"); +} +#endif // NDEBUG + +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 |