Abseil Common Libraries (C++) (grcp 依赖)
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1264 lines
41 KiB
1264 lines
41 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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#include "absl/strings/string_view.h" |
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#include <stdlib.h> |
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#include <iomanip> |
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#include <iterator> |
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#include <limits> |
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#include <map> |
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#include <sstream> |
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#include <stdexcept> |
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#include <string> |
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#include <type_traits> |
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#include <utility> |
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#include "gtest/gtest.h" |
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#include "absl/base/config.h" |
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#include "absl/base/dynamic_annotations.h" |
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#include "absl/base/options.h" |
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#if defined(ABSL_HAVE_STD_STRING_VIEW) || defined(__ANDROID__) |
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// We don't control the death messaging when using std::string_view. |
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// Android assert messages only go to system log, so death tests cannot inspect |
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// the message for matching. |
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#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \ |
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EXPECT_DEATH_IF_SUPPORTED(statement, ".*") |
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#else |
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#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \ |
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EXPECT_DEATH_IF_SUPPORTED(statement, regex) |
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#endif |
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namespace { |
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// A minimal allocator that uses malloc(). |
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template <typename T> |
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struct Mallocator { |
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typedef T value_type; |
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typedef size_t size_type; |
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typedef ptrdiff_t difference_type; |
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typedef T* pointer; |
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typedef const T* const_pointer; |
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typedef T& reference; |
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typedef const T& const_reference; |
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size_type max_size() const { |
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return size_t(std::numeric_limits<size_type>::max()) / sizeof(value_type); |
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} |
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template <typename U> |
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struct rebind { |
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typedef Mallocator<U> other; |
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}; |
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Mallocator() = default; |
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template <class U> |
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Mallocator(const Mallocator<U>&) {} // NOLINT(runtime/explicit) |
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T* allocate(size_t n) { return static_cast<T*>(std::malloc(n * sizeof(T))); } |
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void deallocate(T* p, size_t) { std::free(p); } |
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}; |
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template <typename T, typename U> |
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bool operator==(const Mallocator<T>&, const Mallocator<U>&) { |
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return true; |
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} |
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template <typename T, typename U> |
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bool operator!=(const Mallocator<T>&, const Mallocator<U>&) { |
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return false; |
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} |
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TEST(StringViewTest, Ctor) { |
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{ |
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// Null. |
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absl::string_view s10; |
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EXPECT_TRUE(s10.data() == nullptr); |
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EXPECT_EQ(0, s10.length()); |
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} |
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{ |
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// const char* without length. |
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const char* hello = "hello"; |
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absl::string_view s20(hello); |
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EXPECT_TRUE(s20.data() == hello); |
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EXPECT_EQ(5, s20.length()); |
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// const char* with length. |
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absl::string_view s21(hello, 4); |
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EXPECT_TRUE(s21.data() == hello); |
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EXPECT_EQ(4, s21.length()); |
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// Not recommended, but valid C++ |
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absl::string_view s22(hello, 6); |
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EXPECT_TRUE(s22.data() == hello); |
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EXPECT_EQ(6, s22.length()); |
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} |
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{ |
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// std::string. |
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std::string hola = "hola"; |
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absl::string_view s30(hola); |
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EXPECT_TRUE(s30.data() == hola.data()); |
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EXPECT_EQ(4, s30.length()); |
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// std::string with embedded '\0'. |
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hola.push_back('\0'); |
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hola.append("h2"); |
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hola.push_back('\0'); |
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absl::string_view s31(hola); |
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EXPECT_TRUE(s31.data() == hola.data()); |
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EXPECT_EQ(8, s31.length()); |
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} |
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{ |
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using mstring = |
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std::basic_string<char, std::char_traits<char>, Mallocator<char>>; |
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mstring str1("BUNGIE-JUMPING!"); |
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const mstring str2("SLEEPING!"); |
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absl::string_view s1(str1); |
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s1.remove_prefix(strlen("BUNGIE-JUM")); |
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absl::string_view s2(str2); |
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s2.remove_prefix(strlen("SLEE")); |
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EXPECT_EQ(s1, s2); |
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EXPECT_EQ(s1, "PING!"); |
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} |
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// TODO(mec): absl::string_view(const absl::string_view&); |
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} |
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TEST(StringViewTest, Swap) { |
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absl::string_view a("a"); |
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absl::string_view b("bbb"); |
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EXPECT_TRUE(noexcept(a.swap(b))); |
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a.swap(b); |
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EXPECT_EQ(a, "bbb"); |
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EXPECT_EQ(b, "a"); |
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a.swap(b); |
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EXPECT_EQ(a, "a"); |
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EXPECT_EQ(b, "bbb"); |
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} |
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TEST(StringViewTest, STLComparator) { |
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std::string s1("foo"); |
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std::string s2("bar"); |
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std::string s3("baz"); |
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absl::string_view p1(s1); |
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absl::string_view p2(s2); |
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absl::string_view p3(s3); |
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typedef std::map<absl::string_view, int> TestMap; |
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TestMap map; |
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map.insert(std::make_pair(p1, 0)); |
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map.insert(std::make_pair(p2, 1)); |
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map.insert(std::make_pair(p3, 2)); |
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EXPECT_EQ(map.size(), 3); |
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TestMap::const_iterator iter = map.begin(); |
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EXPECT_EQ(iter->second, 1); |
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++iter; |
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EXPECT_EQ(iter->second, 2); |
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++iter; |
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EXPECT_EQ(iter->second, 0); |
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++iter; |
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EXPECT_TRUE(iter == map.end()); |
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TestMap::iterator new_iter = map.find("zot"); |
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EXPECT_TRUE(new_iter == map.end()); |
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new_iter = map.find("bar"); |
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EXPECT_TRUE(new_iter != map.end()); |
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map.erase(new_iter); |
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EXPECT_EQ(map.size(), 2); |
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iter = map.begin(); |
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EXPECT_EQ(iter->second, 2); |
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++iter; |
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EXPECT_EQ(iter->second, 0); |
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++iter; |
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EXPECT_TRUE(iter == map.end()); |
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} |
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#define COMPARE(result, op, x, y) \ |
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EXPECT_EQ(result, absl::string_view((x)) op absl::string_view((y))); \ |
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EXPECT_EQ(result, absl::string_view((x)).compare(absl::string_view((y))) op 0) |
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TEST(StringViewTest, ComparisonOperators) { |
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COMPARE(true, ==, "", ""); |
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COMPARE(true, ==, "", absl::string_view()); |
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COMPARE(true, ==, absl::string_view(), ""); |
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COMPARE(true, ==, "a", "a"); |
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COMPARE(true, ==, "aa", "aa"); |
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COMPARE(false, ==, "a", ""); |
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COMPARE(false, ==, "", "a"); |
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COMPARE(false, ==, "a", "b"); |
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COMPARE(false, ==, "a", "aa"); |
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COMPARE(false, ==, "aa", "a"); |
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COMPARE(false, !=, "", ""); |
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COMPARE(false, !=, "a", "a"); |
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COMPARE(false, !=, "aa", "aa"); |
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COMPARE(true, !=, "a", ""); |
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COMPARE(true, !=, "", "a"); |
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COMPARE(true, !=, "a", "b"); |
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COMPARE(true, !=, "a", "aa"); |
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COMPARE(true, !=, "aa", "a"); |
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COMPARE(true, <, "a", "b"); |
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COMPARE(true, <, "a", "aa"); |
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COMPARE(true, <, "aa", "b"); |
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COMPARE(true, <, "aa", "bb"); |
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COMPARE(false, <, "a", "a"); |
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COMPARE(false, <, "b", "a"); |
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COMPARE(false, <, "aa", "a"); |
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COMPARE(false, <, "b", "aa"); |
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COMPARE(false, <, "bb", "aa"); |
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COMPARE(true, <=, "a", "a"); |
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COMPARE(true, <=, "a", "b"); |
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COMPARE(true, <=, "a", "aa"); |
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COMPARE(true, <=, "aa", "b"); |
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COMPARE(true, <=, "aa", "bb"); |
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COMPARE(false, <=, "b", "a"); |
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COMPARE(false, <=, "aa", "a"); |
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COMPARE(false, <=, "b", "aa"); |
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COMPARE(false, <=, "bb", "aa"); |
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COMPARE(false, >=, "a", "b"); |
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COMPARE(false, >=, "a", "aa"); |
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COMPARE(false, >=, "aa", "b"); |
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COMPARE(false, >=, "aa", "bb"); |
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COMPARE(true, >=, "a", "a"); |
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COMPARE(true, >=, "b", "a"); |
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COMPARE(true, >=, "aa", "a"); |
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COMPARE(true, >=, "b", "aa"); |
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COMPARE(true, >=, "bb", "aa"); |
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COMPARE(false, >, "a", "a"); |
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COMPARE(false, >, "a", "b"); |
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COMPARE(false, >, "a", "aa"); |
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COMPARE(false, >, "aa", "b"); |
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COMPARE(false, >, "aa", "bb"); |
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COMPARE(true, >, "b", "a"); |
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COMPARE(true, >, "aa", "a"); |
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COMPARE(true, >, "b", "aa"); |
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COMPARE(true, >, "bb", "aa"); |
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} |
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TEST(StringViewTest, ComparisonOperatorsByCharacterPosition) { |
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std::string x; |
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for (int i = 0; i < 256; i++) { |
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x += 'a'; |
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std::string y = x; |
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COMPARE(true, ==, x, y); |
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for (int j = 0; j < i; j++) { |
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std::string z = x; |
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z[j] = 'b'; // Differs in position 'j' |
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COMPARE(false, ==, x, z); |
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COMPARE(true, <, x, z); |
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COMPARE(true, >, z, x); |
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if (j + 1 < i) { |
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z[j + 1] = 'A'; // Differs in position 'j+1' as well |
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COMPARE(false, ==, x, z); |
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COMPARE(true, <, x, z); |
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COMPARE(true, >, z, x); |
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z[j + 1] = 'z'; // Differs in position 'j+1' as well |
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COMPARE(false, ==, x, z); |
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COMPARE(true, <, x, z); |
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COMPARE(true, >, z, x); |
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} |
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} |
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} |
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} |
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#undef COMPARE |
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// Sadly, our users often confuse std::string::npos with |
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// absl::string_view::npos; So much so that we test here that they are the same. |
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// They need to both be unsigned, and both be the maximum-valued integer of |
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// their type. |
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template <typename T> |
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struct is_type { |
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template <typename U> |
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static bool same(U) { |
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return false; |
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} |
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static bool same(T) { return true; } |
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}; |
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TEST(StringViewTest, NposMatchesStdStringView) { |
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EXPECT_EQ(absl::string_view::npos, std::string::npos); |
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EXPECT_TRUE(is_type<size_t>::same(absl::string_view::npos)); |
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EXPECT_FALSE(is_type<size_t>::same("")); |
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// Make sure absl::string_view::npos continues to be a header constant. |
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char test[absl::string_view::npos & 1] = {0}; |
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EXPECT_EQ(0, test[0]); |
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} |
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TEST(StringViewTest, STL1) { |
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const absl::string_view a("abcdefghijklmnopqrstuvwxyz"); |
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const absl::string_view b("abc"); |
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const absl::string_view c("xyz"); |
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const absl::string_view d("foobar"); |
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const absl::string_view e; |
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std::string temp("123"); |
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temp += '\0'; |
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temp += "456"; |
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const absl::string_view f(temp); |
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EXPECT_EQ(a[6], 'g'); |
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EXPECT_EQ(b[0], 'a'); |
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EXPECT_EQ(c[2], 'z'); |
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EXPECT_EQ(f[3], '\0'); |
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EXPECT_EQ(f[5], '5'); |
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EXPECT_EQ(*d.data(), 'f'); |
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EXPECT_EQ(d.data()[5], 'r'); |
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EXPECT_TRUE(e.data() == nullptr); |
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EXPECT_EQ(*a.begin(), 'a'); |
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EXPECT_EQ(*(b.begin() + 2), 'c'); |
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EXPECT_EQ(*(c.end() - 1), 'z'); |
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EXPECT_EQ(*a.rbegin(), 'z'); |
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EXPECT_EQ(*(b.rbegin() + 2), 'a'); |
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EXPECT_EQ(*(c.rend() - 1), 'x'); |
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EXPECT_TRUE(a.rbegin() + 26 == a.rend()); |
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EXPECT_EQ(a.size(), 26); |
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EXPECT_EQ(b.size(), 3); |
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EXPECT_EQ(c.size(), 3); |
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EXPECT_EQ(d.size(), 6); |
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EXPECT_EQ(e.size(), 0); |
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EXPECT_EQ(f.size(), 7); |
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EXPECT_TRUE(!d.empty()); |
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EXPECT_TRUE(d.begin() != d.end()); |
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EXPECT_TRUE(d.begin() + 6 == d.end()); |
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EXPECT_TRUE(e.empty()); |
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EXPECT_TRUE(e.begin() == e.end()); |
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char buf[4] = { '%', '%', '%', '%' }; |
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EXPECT_EQ(a.copy(buf, 4), 4); |
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EXPECT_EQ(buf[0], a[0]); |
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EXPECT_EQ(buf[1], a[1]); |
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EXPECT_EQ(buf[2], a[2]); |
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EXPECT_EQ(buf[3], a[3]); |
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EXPECT_EQ(a.copy(buf, 3, 7), 3); |
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EXPECT_EQ(buf[0], a[7]); |
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EXPECT_EQ(buf[1], a[8]); |
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EXPECT_EQ(buf[2], a[9]); |
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EXPECT_EQ(buf[3], a[3]); |
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EXPECT_EQ(c.copy(buf, 99), 3); |
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EXPECT_EQ(buf[0], c[0]); |
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EXPECT_EQ(buf[1], c[1]); |
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EXPECT_EQ(buf[2], c[2]); |
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EXPECT_EQ(buf[3], a[3]); |
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#ifdef ABSL_HAVE_EXCEPTIONS |
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EXPECT_THROW(a.copy(buf, 1, 27), std::out_of_range); |
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#else |
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ABSL_EXPECT_DEATH_IF_SUPPORTED(a.copy(buf, 1, 27), "absl::string_view::copy"); |
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#endif |
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} |
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// Separated from STL1() because some compilers produce an overly |
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// large stack frame for the combined function. |
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TEST(StringViewTest, STL2) { |
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const absl::string_view a("abcdefghijklmnopqrstuvwxyz"); |
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const absl::string_view b("abc"); |
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const absl::string_view c("xyz"); |
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absl::string_view d("foobar"); |
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const absl::string_view e; |
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const absl::string_view f( |
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"123" |
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"\0" |
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"456", |
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7); |
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d = absl::string_view(); |
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EXPECT_EQ(d.size(), 0); |
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EXPECT_TRUE(d.empty()); |
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EXPECT_TRUE(d.data() == nullptr); |
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EXPECT_TRUE(d.begin() == d.end()); |
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EXPECT_EQ(a.find(b), 0); |
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EXPECT_EQ(a.find(b, 1), absl::string_view::npos); |
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EXPECT_EQ(a.find(c), 23); |
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EXPECT_EQ(a.find(c, 9), 23); |
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EXPECT_EQ(a.find(c, absl::string_view::npos), absl::string_view::npos); |
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EXPECT_EQ(b.find(c), absl::string_view::npos); |
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EXPECT_EQ(b.find(c, absl::string_view::npos), absl::string_view::npos); |
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EXPECT_EQ(a.find(d), 0); |
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EXPECT_EQ(a.find(e), 0); |
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EXPECT_EQ(a.find(d, 12), 12); |
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EXPECT_EQ(a.find(e, 17), 17); |
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absl::string_view g("xx not found bb"); |
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EXPECT_EQ(a.find(g), absl::string_view::npos); |
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// empty string nonsense |
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EXPECT_EQ(d.find(b), absl::string_view::npos); |
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EXPECT_EQ(e.find(b), absl::string_view::npos); |
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EXPECT_EQ(d.find(b, 4), absl::string_view::npos); |
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EXPECT_EQ(e.find(b, 7), absl::string_view::npos); |
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size_t empty_search_pos = std::string().find(std::string()); |
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EXPECT_EQ(d.find(d), empty_search_pos); |
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EXPECT_EQ(d.find(e), empty_search_pos); |
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EXPECT_EQ(e.find(d), empty_search_pos); |
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EXPECT_EQ(e.find(e), empty_search_pos); |
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EXPECT_EQ(d.find(d, 4), std::string().find(std::string(), 4)); |
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EXPECT_EQ(d.find(e, 4), std::string().find(std::string(), 4)); |
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EXPECT_EQ(e.find(d, 4), std::string().find(std::string(), 4)); |
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EXPECT_EQ(e.find(e, 4), std::string().find(std::string(), 4)); |
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EXPECT_EQ(a.find('a'), 0); |
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EXPECT_EQ(a.find('c'), 2); |
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EXPECT_EQ(a.find('z'), 25); |
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EXPECT_EQ(a.find('$'), absl::string_view::npos); |
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EXPECT_EQ(a.find('\0'), absl::string_view::npos); |
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EXPECT_EQ(f.find('\0'), 3); |
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EXPECT_EQ(f.find('3'), 2); |
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EXPECT_EQ(f.find('5'), 5); |
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EXPECT_EQ(g.find('o'), 4); |
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EXPECT_EQ(g.find('o', 4), 4); |
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EXPECT_EQ(g.find('o', 5), 8); |
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EXPECT_EQ(a.find('b', 5), absl::string_view::npos); |
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// empty string nonsense |
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EXPECT_EQ(d.find('\0'), absl::string_view::npos); |
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EXPECT_EQ(e.find('\0'), absl::string_view::npos); |
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EXPECT_EQ(d.find('\0', 4), absl::string_view::npos); |
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EXPECT_EQ(e.find('\0', 7), absl::string_view::npos); |
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EXPECT_EQ(d.find('x'), absl::string_view::npos); |
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EXPECT_EQ(e.find('x'), absl::string_view::npos); |
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EXPECT_EQ(d.find('x', 4), absl::string_view::npos); |
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EXPECT_EQ(e.find('x', 7), absl::string_view::npos); |
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EXPECT_EQ(a.rfind(b), 0); |
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EXPECT_EQ(a.rfind(b, 1), 0); |
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EXPECT_EQ(a.rfind(c), 23); |
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EXPECT_EQ(a.rfind(c, 22), absl::string_view::npos); |
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EXPECT_EQ(a.rfind(c, 1), absl::string_view::npos); |
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EXPECT_EQ(a.rfind(c, 0), absl::string_view::npos); |
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EXPECT_EQ(b.rfind(c), absl::string_view::npos); |
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EXPECT_EQ(b.rfind(c, 0), absl::string_view::npos); |
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EXPECT_EQ(a.rfind(d), std::string(a).rfind(std::string())); |
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EXPECT_EQ(a.rfind(e), std::string(a).rfind(std::string())); |
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EXPECT_EQ(a.rfind(d, 12), 12); |
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EXPECT_EQ(a.rfind(e, 17), 17); |
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EXPECT_EQ(a.rfind(g), absl::string_view::npos); |
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EXPECT_EQ(d.rfind(b), absl::string_view::npos); |
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EXPECT_EQ(e.rfind(b), absl::string_view::npos); |
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EXPECT_EQ(d.rfind(b, 4), absl::string_view::npos); |
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EXPECT_EQ(e.rfind(b, 7), absl::string_view::npos); |
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// empty string nonsense |
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EXPECT_EQ(d.rfind(d, 4), std::string().rfind(std::string())); |
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EXPECT_EQ(e.rfind(d, 7), std::string().rfind(std::string())); |
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EXPECT_EQ(d.rfind(e, 4), std::string().rfind(std::string())); |
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EXPECT_EQ(e.rfind(e, 7), std::string().rfind(std::string())); |
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EXPECT_EQ(d.rfind(d), std::string().rfind(std::string())); |
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EXPECT_EQ(e.rfind(d), std::string().rfind(std::string())); |
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EXPECT_EQ(d.rfind(e), std::string().rfind(std::string())); |
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EXPECT_EQ(e.rfind(e), std::string().rfind(std::string())); |
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EXPECT_EQ(g.rfind('o'), 8); |
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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
|
|
|