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+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/string_view.h"
+
+#include <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