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dawn-cmake/third_party/abseil-cpp/absl/strings/str_split_test.cc

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/strings/str_split.h"
#include <deque>
#include <initializer_list>
#include <list>
#include <map>
#include <memory>
#include <string>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/base/dynamic_annotations.h"
#include "absl/base/macros.h"
#include "absl/container/btree_map.h"
#include "absl/container/btree_set.h"
#include "absl/container/flat_hash_map.h"
#include "absl/container/node_hash_map.h"
#include "absl/strings/numbers.h"
namespace {
using ::testing::ElementsAre;
using ::testing::Pair;
using ::testing::UnorderedElementsAre;
TEST(Split, TraitsTest) {
static_assert(!absl::strings_internal::SplitterIsConvertibleTo<int>::value,
"");
static_assert(
!absl::strings_internal::SplitterIsConvertibleTo<std::string>::value, "");
static_assert(absl::strings_internal::SplitterIsConvertibleTo<
std::vector<std::string>>::value,
"");
static_assert(
!absl::strings_internal::SplitterIsConvertibleTo<std::vector<int>>::value,
"");
static_assert(absl::strings_internal::SplitterIsConvertibleTo<
std::vector<absl::string_view>>::value,
"");
static_assert(absl::strings_internal::SplitterIsConvertibleTo<
std::map<std::string, std::string>>::value,
"");
static_assert(absl::strings_internal::SplitterIsConvertibleTo<
std::map<absl::string_view, absl::string_view>>::value,
"");
static_assert(!absl::strings_internal::SplitterIsConvertibleTo<
std::map<int, std::string>>::value,
"");
static_assert(!absl::strings_internal::SplitterIsConvertibleTo<
std::map<std::string, int>>::value,
"");
}
// This tests the overall split API, which is made up of the absl::StrSplit()
// function and the Delimiter objects in the absl:: namespace.
// This TEST macro is outside of any namespace to require full specification of
// namespaces just like callers will need to use.
TEST(Split, APIExamples) {
{
// Passes string delimiter. Assumes the default of ByString.
std::vector<std::string> v = absl::StrSplit("a,b,c", ","); // NOLINT
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
// Equivalent to...
using absl::ByString;
v = absl::StrSplit("a,b,c", ByString(","));
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
// Equivalent to...
EXPECT_THAT(absl::StrSplit("a,b,c", ByString(",")),
ElementsAre("a", "b", "c"));
}
{
// Same as above, but using a single character as the delimiter.
std::vector<std::string> v = absl::StrSplit("a,b,c", ',');
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
// Equivalent to...
using absl::ByChar;
v = absl::StrSplit("a,b,c", ByChar(','));
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
// Uses the Literal string "=>" as the delimiter.
const std::vector<std::string> v = absl::StrSplit("a=>b=>c", "=>");
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
// The substrings are returned as string_views, eliminating copying.
std::vector<absl::string_view> v = absl::StrSplit("a,b,c", ',');
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
// Leading and trailing empty substrings.
std::vector<std::string> v = absl::StrSplit(",a,b,c,", ',');
EXPECT_THAT(v, ElementsAre("", "a", "b", "c", ""));
}
{
// Splits on a delimiter that is not found.
std::vector<std::string> v = absl::StrSplit("abc", ',');
EXPECT_THAT(v, ElementsAre("abc"));
}
{
// Splits the input string into individual characters by using an empty
// string as the delimiter.
std::vector<std::string> v = absl::StrSplit("abc", "");
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
// Splits string data with embedded NUL characters, using NUL as the
// delimiter. A simple delimiter of "\0" doesn't work because strlen() will
// say that's the empty string when constructing the absl::string_view
// delimiter. Instead, a non-empty string containing NUL can be used as the
// delimiter.
std::string embedded_nulls("a\0b\0c", 5);
std::string null_delim("\0", 1);
std::vector<std::string> v = absl::StrSplit(embedded_nulls, null_delim);
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
// Stores first two split strings as the members in a std::pair.
std::pair<std::string, std::string> p = absl::StrSplit("a,b,c", ',');
EXPECT_EQ("a", p.first);
EXPECT_EQ("b", p.second);
// "c" is omitted because std::pair can hold only two elements.
}
{
// Results stored in std::set<std::string>
std::set<std::string> v = absl::StrSplit("a,b,c,a,b,c,a,b,c", ',');
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
// Uses a non-const char* delimiter.
char a[] = ",";
char* d = a + 0;
std::vector<std::string> v = absl::StrSplit("a,b,c", d);
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
// Results split using either of , or ;
using absl::ByAnyChar;
std::vector<std::string> v = absl::StrSplit("a,b;c", ByAnyChar(",;"));
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
// Uses the SkipWhitespace predicate.
using absl::SkipWhitespace;
std::vector<std::string> v =
absl::StrSplit(" a , ,,b,", ',', SkipWhitespace());
EXPECT_THAT(v, ElementsAre(" a ", "b"));
}
{
// Uses the ByLength delimiter.
using absl::ByLength;
std::vector<std::string> v = absl::StrSplit("abcdefg", ByLength(3));
EXPECT_THAT(v, ElementsAre("abc", "def", "g"));
}
{
// Different forms of initialization / conversion.
std::vector<std::string> v1 = absl::StrSplit("a,b,c", ',');
EXPECT_THAT(v1, ElementsAre("a", "b", "c"));
std::vector<std::string> v2(absl::StrSplit("a,b,c", ','));
EXPECT_THAT(v2, ElementsAre("a", "b", "c"));
auto v3 = std::vector<std::string>(absl::StrSplit("a,b,c", ','));
EXPECT_THAT(v3, ElementsAre("a", "b", "c"));
v3 = absl::StrSplit("a,b,c", ',');
EXPECT_THAT(v3, ElementsAre("a", "b", "c"));
}
{
// Results stored in a std::map.
std::map<std::string, std::string> m = absl::StrSplit("a,1,b,2,a,3", ',');
EXPECT_EQ(2, m.size());
EXPECT_EQ("3", m["a"]);
EXPECT_EQ("2", m["b"]);
}
{
// Results stored in a std::multimap.
std::multimap<std::string, std::string> m =
absl::StrSplit("a,1,b,2,a,3", ',');
EXPECT_EQ(3, m.size());
auto it = m.find("a");
EXPECT_EQ("1", it->second);
++it;
EXPECT_EQ("3", it->second);
it = m.find("b");
EXPECT_EQ("2", it->second);
}
{
// Demonstrates use in a range-based for loop in C++11.
std::string s = "x,x,x,x,x,x,x";
for (absl::string_view sp : absl::StrSplit(s, ',')) {
EXPECT_EQ("x", sp);
}
}
{
// Demonstrates use with a Predicate in a range-based for loop.
using absl::SkipWhitespace;
std::string s = " ,x,,x,,x,x,x,,";
for (absl::string_view sp : absl::StrSplit(s, ',', SkipWhitespace())) {
EXPECT_EQ("x", sp);
}
}
{
// Demonstrates a "smart" split to std::map using two separate calls to
// absl::StrSplit. One call to split the records, and another call to split
// the keys and values. This also uses the Limit delimiter so that the
// std::string "a=b=c" will split to "a" -> "b=c".
std::map<std::string, std::string> m;
for (absl::string_view sp : absl::StrSplit("a=b=c,d=e,f=,g", ',')) {
m.insert(absl::StrSplit(sp, absl::MaxSplits('=', 1)));
}
EXPECT_EQ("b=c", m.find("a")->second);
EXPECT_EQ("e", m.find("d")->second);
EXPECT_EQ("", m.find("f")->second);
EXPECT_EQ("", m.find("g")->second);
}
}
//
// Tests for SplitIterator
//
TEST(SplitIterator, Basics) {
auto splitter = absl::StrSplit("a,b", ',');
auto it = splitter.begin();
auto end = splitter.end();
EXPECT_NE(it, end);
EXPECT_EQ("a", *it); // tests dereference
++it; // tests preincrement
EXPECT_NE(it, end);
EXPECT_EQ("b",
std::string(it->data(), it->size())); // tests dereference as ptr
it++; // tests postincrement
EXPECT_EQ(it, end);
}
// Simple Predicate to skip a particular string.
class Skip {
public:
explicit Skip(const std::string& s) : s_(s) {}
bool operator()(absl::string_view sp) { return sp != s_; }
private:
std::string s_;
};
TEST(SplitIterator, Predicate) {
auto splitter = absl::StrSplit("a,b,c", ',', Skip("b"));
auto it = splitter.begin();
auto end = splitter.end();
EXPECT_NE(it, end);
EXPECT_EQ("a", *it); // tests dereference
++it; // tests preincrement -- "b" should be skipped here.
EXPECT_NE(it, end);
EXPECT_EQ("c",
std::string(it->data(), it->size())); // tests dereference as ptr
it++; // tests postincrement
EXPECT_EQ(it, end);
}
TEST(SplitIterator, EdgeCases) {
// Expected input and output, assuming a delimiter of ','
struct {
std::string in;
std::vector<std::string> expect;
} specs[] = {
{"", {""}},
{"foo", {"foo"}},
{",", {"", ""}},
{",foo", {"", "foo"}},
{"foo,", {"foo", ""}},
{",foo,", {"", "foo", ""}},
{"foo,bar", {"foo", "bar"}},
};
for (const auto& spec : specs) {
SCOPED_TRACE(spec.in);
auto splitter = absl::StrSplit(spec.in, ',');
auto it = splitter.begin();
auto end = splitter.end();
for (const auto& expected : spec.expect) {
EXPECT_NE(it, end);
EXPECT_EQ(expected, *it++);
}
EXPECT_EQ(it, end);
}
}
TEST(Splitter, Const) {
const auto splitter = absl::StrSplit("a,b,c", ',');
EXPECT_THAT(splitter, ElementsAre("a", "b", "c"));
}
TEST(Split, EmptyAndNull) {
// Attention: Splitting a null absl::string_view is different than splitting
// an empty absl::string_view even though both string_views are considered
// equal. This behavior is likely surprising and undesirable. However, to
// maintain backward compatibility, there is a small "hack" in
// str_split_internal.h that preserves this behavior. If that behavior is ever
// changed/fixed, this test will need to be updated.
EXPECT_THAT(absl::StrSplit(absl::string_view(""), '-'), ElementsAre(""));
EXPECT_THAT(absl::StrSplit(absl::string_view(), '-'), ElementsAre());
}
TEST(SplitIterator, EqualityAsEndCondition) {
auto splitter = absl::StrSplit("a,b,c", ',');
auto it = splitter.begin();
auto it2 = it;
// Increments it2 twice to point to "c" in the input text.
++it2;
++it2;
EXPECT_EQ("c", *it2);
// This test uses a non-end SplitIterator as the terminating condition in a
// for loop. This relies on SplitIterator equality for non-end SplitIterators
// working correctly. At this point it2 points to "c", and we use that as the
// "end" condition in this test.
std::vector<absl::string_view> v;
for (; it != it2; ++it) {
v.push_back(*it);
}
EXPECT_THAT(v, ElementsAre("a", "b"));
}
//
// Tests for Splitter
//
TEST(Splitter, RangeIterators) {
auto splitter = absl::StrSplit("a,b,c", ',');
std::vector<absl::string_view> output;
for (const absl::string_view& p : splitter) {
output.push_back(p);
}
EXPECT_THAT(output, ElementsAre("a", "b", "c"));
}
// Some template functions for use in testing conversion operators
template <typename ContainerType, typename Splitter>
void TestConversionOperator(const Splitter& splitter) {
ContainerType output = splitter;
EXPECT_THAT(output, UnorderedElementsAre("a", "b", "c", "d"));
}
template <typename MapType, typename Splitter>
void TestMapConversionOperator(const Splitter& splitter) {
MapType m = splitter;
EXPECT_THAT(m, UnorderedElementsAre(Pair("a", "b"), Pair("c", "d")));
}
template <typename FirstType, typename SecondType, typename Splitter>
void TestPairConversionOperator(const Splitter& splitter) {
std::pair<FirstType, SecondType> p = splitter;
EXPECT_EQ(p, (std::pair<FirstType, SecondType>("a", "b")));
}
TEST(Splitter, ConversionOperator) {
auto splitter = absl::StrSplit("a,b,c,d", ',');
TestConversionOperator<std::vector<absl::string_view>>(splitter);
TestConversionOperator<std::vector<std::string>>(splitter);
TestConversionOperator<std::list<absl::string_view>>(splitter);
TestConversionOperator<std::list<std::string>>(splitter);
TestConversionOperator<std::deque<absl::string_view>>(splitter);
TestConversionOperator<std::deque<std::string>>(splitter);
TestConversionOperator<std::set<absl::string_view>>(splitter);
TestConversionOperator<std::set<std::string>>(splitter);
TestConversionOperator<std::multiset<absl::string_view>>(splitter);
TestConversionOperator<std::multiset<std::string>>(splitter);
TestConversionOperator<absl::btree_set<absl::string_view>>(splitter);
TestConversionOperator<absl::btree_set<std::string>>(splitter);
TestConversionOperator<absl::btree_multiset<absl::string_view>>(splitter);
TestConversionOperator<absl::btree_multiset<std::string>>(splitter);
TestConversionOperator<std::unordered_set<std::string>>(splitter);
// Tests conversion to map-like objects.
TestMapConversionOperator<std::map<absl::string_view, absl::string_view>>(
splitter);
TestMapConversionOperator<std::map<absl::string_view, std::string>>(splitter);
TestMapConversionOperator<std::map<std::string, absl::string_view>>(splitter);
TestMapConversionOperator<std::map<std::string, std::string>>(splitter);
TestMapConversionOperator<
std::multimap<absl::string_view, absl::string_view>>(splitter);
TestMapConversionOperator<std::multimap<absl::string_view, std::string>>(
splitter);
TestMapConversionOperator<std::multimap<std::string, absl::string_view>>(
splitter);
TestMapConversionOperator<std::multimap<std::string, std::string>>(splitter);
TestMapConversionOperator<
absl::btree_map<absl::string_view, absl::string_view>>(splitter);
TestMapConversionOperator<absl::btree_map<absl::string_view, std::string>>(
splitter);
TestMapConversionOperator<absl::btree_map<std::string, absl::string_view>>(
splitter);
TestMapConversionOperator<absl::btree_map<std::string, std::string>>(
splitter);
TestMapConversionOperator<
absl::btree_multimap<absl::string_view, absl::string_view>>(splitter);
TestMapConversionOperator<
absl::btree_multimap<absl::string_view, std::string>>(splitter);
TestMapConversionOperator<
absl::btree_multimap<std::string, absl::string_view>>(splitter);
TestMapConversionOperator<absl::btree_multimap<std::string, std::string>>(
splitter);
TestMapConversionOperator<std::unordered_map<std::string, std::string>>(
splitter);
TestMapConversionOperator<
absl::node_hash_map<absl::string_view, absl::string_view>>(splitter);
TestMapConversionOperator<
absl::node_hash_map<absl::string_view, std::string>>(splitter);
TestMapConversionOperator<
absl::node_hash_map<std::string, absl::string_view>>(splitter);
TestMapConversionOperator<
absl::flat_hash_map<absl::string_view, absl::string_view>>(splitter);
TestMapConversionOperator<
absl::flat_hash_map<absl::string_view, std::string>>(splitter);
TestMapConversionOperator<
absl::flat_hash_map<std::string, absl::string_view>>(splitter);
// Tests conversion to std::pair
TestPairConversionOperator<absl::string_view, absl::string_view>(splitter);
TestPairConversionOperator<absl::string_view, std::string>(splitter);
TestPairConversionOperator<std::string, absl::string_view>(splitter);
TestPairConversionOperator<std::string, std::string>(splitter);
}
// A few additional tests for conversion to std::pair. This conversion is
// different from others because a std::pair always has exactly two elements:
// .first and .second. The split has to work even when the split has
// less-than, equal-to, and more-than 2 strings.
TEST(Splitter, ToPair) {
{
// Empty string
std::pair<std::string, std::string> p = absl::StrSplit("", ',');
EXPECT_EQ("", p.first);
EXPECT_EQ("", p.second);
}
{
// Only first
std::pair<std::string, std::string> p = absl::StrSplit("a", ',');
EXPECT_EQ("a", p.first);
EXPECT_EQ("", p.second);
}
{
// Only second
std::pair<std::string, std::string> p = absl::StrSplit(",b", ',');
EXPECT_EQ("", p.first);
EXPECT_EQ("b", p.second);
}
{
// First and second.
std::pair<std::string, std::string> p = absl::StrSplit("a,b", ',');
EXPECT_EQ("a", p.first);
EXPECT_EQ("b", p.second);
}
{
// First and second and then more stuff that will be ignored.
std::pair<std::string, std::string> p = absl::StrSplit("a,b,c", ',');
EXPECT_EQ("a", p.first);
EXPECT_EQ("b", p.second);
// "c" is omitted.
}
}
TEST(Splitter, Predicates) {
static const char kTestChars[] = ",a, ,b,";
using absl::AllowEmpty;
using absl::SkipEmpty;
using absl::SkipWhitespace;
{
// No predicate. Does not skip empties.
auto splitter = absl::StrSplit(kTestChars, ',');
std::vector<std::string> v = splitter;
EXPECT_THAT(v, ElementsAre("", "a", " ", "b", ""));
}
{
// Allows empty strings. Same behavior as no predicate at all.
auto splitter = absl::StrSplit(kTestChars, ',', AllowEmpty());
std::vector<std::string> v_allowempty = splitter;
EXPECT_THAT(v_allowempty, ElementsAre("", "a", " ", "b", ""));
// Ensures AllowEmpty equals the behavior with no predicate.
auto splitter_nopredicate = absl::StrSplit(kTestChars, ',');
std::vector<std::string> v_nopredicate = splitter_nopredicate;
EXPECT_EQ(v_allowempty, v_nopredicate);
}
{
// Skips empty strings.
auto splitter = absl::StrSplit(kTestChars, ',', SkipEmpty());
std::vector<std::string> v = splitter;
EXPECT_THAT(v, ElementsAre("a", " ", "b"));
}
{
// Skips empty and all-whitespace strings.
auto splitter = absl::StrSplit(kTestChars, ',', SkipWhitespace());
std::vector<std::string> v = splitter;
EXPECT_THAT(v, ElementsAre("a", "b"));
}
}
//
// Tests for StrSplit()
//
TEST(Split, Basics) {
{
// Doesn't really do anything useful because the return value is ignored,
// but it should work.
absl::StrSplit("a,b,c", ',');
}
{
std::vector<absl::string_view> v = absl::StrSplit("a,b,c", ',');
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
std::vector<std::string> v = absl::StrSplit("a,b,c", ',');
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
}
{
// Ensures that assignment works. This requires a little extra work with
// C++11 because of overloads with initializer_list.
std::vector<std::string> v;
v = absl::StrSplit("a,b,c", ',');
EXPECT_THAT(v, ElementsAre("a", "b", "c"));
std::map<std::string, std::string> m;
m = absl::StrSplit("a,b,c", ',');
EXPECT_EQ(2, m.size());
std::unordered_map<std::string, std::string> hm;
hm = absl::StrSplit("a,b,c", ',');
EXPECT_EQ(2, hm.size());
}
}
absl::string_view ReturnStringView() { return "Hello World"; }
const char* ReturnConstCharP() { return "Hello World"; }
char* ReturnCharP() { return const_cast<char*>("Hello World"); }
TEST(Split, AcceptsCertainTemporaries) {
std::vector<std::string> v;
v = absl::StrSplit(ReturnStringView(), ' ');
EXPECT_THAT(v, ElementsAre("Hello", "World"));
v = absl::StrSplit(ReturnConstCharP(), ' ');
EXPECT_THAT(v, ElementsAre("Hello", "World"));
v = absl::StrSplit(ReturnCharP(), ' ');
EXPECT_THAT(v, ElementsAre("Hello", "World"));
}
TEST(Split, Temporary) {
// Use a std::string longer than the SSO length, so that when the temporary is
// destroyed, if the splitter keeps a reference to the string's contents,
// it'll reference freed memory instead of just dead on-stack memory.
const char input[] = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u";
EXPECT_LT(sizeof(std::string), ABSL_ARRAYSIZE(input))
<< "Input should be larger than fits on the stack.";
// This happens more often in C++11 as part of a range-based for loop.
auto splitter = absl::StrSplit(std::string(input), ',');
std::string expected = "a";
for (absl::string_view letter : splitter) {
EXPECT_EQ(expected, letter);
++expected[0];
}
EXPECT_EQ("v", expected);
// This happens more often in C++11 as part of a range-based for loop.
auto std_splitter = absl::StrSplit(std::string(input), ',');
expected = "a";
for (absl::string_view letter : std_splitter) {
EXPECT_EQ(expected, letter);
++expected[0];
}
EXPECT_EQ("v", expected);
}
template <typename T>
static std::unique_ptr<T> CopyToHeap(const T& value) {
return std::unique_ptr<T>(new T(value));
}
TEST(Split, LvalueCaptureIsCopyable) {
std::string input = "a,b";
auto heap_splitter = CopyToHeap(absl::StrSplit(input, ','));
auto stack_splitter = *heap_splitter;
heap_splitter.reset();
std::vector<std::string> result = stack_splitter;
EXPECT_THAT(result, testing::ElementsAre("a", "b"));
}
TEST(Split, TemporaryCaptureIsCopyable) {
auto heap_splitter = CopyToHeap(absl::StrSplit(std::string("a,b"), ','));
auto stack_splitter = *heap_splitter;
heap_splitter.reset();
std::vector<std::string> result = stack_splitter;
EXPECT_THAT(result, testing::ElementsAre("a", "b"));
}
TEST(Split, SplitterIsCopyableAndMoveable) {
auto a = absl::StrSplit("foo", '-');
// Ensures that the following expressions compile.
auto b = a; // Copy construct
auto c = std::move(a); // Move construct
b = c; // Copy assign
c = std::move(b); // Move assign
EXPECT_THAT(c, ElementsAre("foo"));
}
TEST(Split, StringDelimiter) {
{
std::vector<absl::string_view> v = absl::StrSplit("a,b", ',');
EXPECT_THAT(v, ElementsAre("a", "b"));
}
{
std::vector<absl::string_view> v = absl::StrSplit("a,b", std::string(","));
EXPECT_THAT(v, ElementsAre("a", "b"));
}
{
std::vector<absl::string_view> v =
absl::StrSplit("a,b", absl::string_view(","));
EXPECT_THAT(v, ElementsAre("a", "b"));
}
}
#if !defined(__cpp_char8_t)
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wc++2a-compat"
#endif
TEST(Split, UTF8) {
// Tests splitting utf8 strings and utf8 delimiters.
std::string utf8_string = u8"\u03BA\u1F79\u03C3\u03BC\u03B5";
{
// A utf8 input string with an ascii delimiter.
std::string to_split = "a," + utf8_string;
std::vector<absl::string_view> v = absl::StrSplit(to_split, ',');
EXPECT_THAT(v, ElementsAre("a", utf8_string));
}
{
// A utf8 input string and a utf8 delimiter.
std::string to_split = "a," + utf8_string + ",b";
std::string unicode_delimiter = "," + utf8_string + ",";
std::vector<absl::string_view> v =
absl::StrSplit(to_split, unicode_delimiter);
EXPECT_THAT(v, ElementsAre("a", "b"));
}
{
// A utf8 input string and ByAnyChar with ascii chars.
std::vector<absl::string_view> v =
absl::StrSplit(u8"Foo h\u00E4llo th\u4E1Ere", absl::ByAnyChar(" \t"));
EXPECT_THAT(v, ElementsAre("Foo", u8"h\u00E4llo", u8"th\u4E1Ere"));
}
}
#if defined(__clang__)
#pragma clang diagnostic pop
#endif
#endif // !defined(__cpp_char8_t)
TEST(Split, EmptyStringDelimiter) {
{
std::vector<std::string> v = absl::StrSplit("", "");
EXPECT_THAT(v, ElementsAre(""));
}
{
std::vector<std::string> v = absl::StrSplit("a", "");
EXPECT_THAT(v, ElementsAre("a"));
}
{
std::vector<std::string> v = absl::StrSplit("ab", "");
EXPECT_THAT(v, ElementsAre("a", "b"));
}
{
std::vector<std::string> v = absl::StrSplit("a b", "");
EXPECT_THAT(v, ElementsAre("a", " ", "b"));
}
}
TEST(Split, SubstrDelimiter) {
std::vector<absl::string_view> results;
absl::string_view delim("//");
results = absl::StrSplit("", delim);
EXPECT_THAT(results, ElementsAre(""));
results = absl::StrSplit("//", delim);
EXPECT_THAT(results, ElementsAre("", ""));
results = absl::StrSplit("ab", delim);
EXPECT_THAT(results, ElementsAre("ab"));
results = absl::StrSplit("ab//", delim);
EXPECT_THAT(results, ElementsAre("ab", ""));
results = absl::StrSplit("ab/", delim);
EXPECT_THAT(results, ElementsAre("ab/"));
results = absl::StrSplit("a/b", delim);
EXPECT_THAT(results, ElementsAre("a/b"));
results = absl::StrSplit("a//b", delim);
EXPECT_THAT(results, ElementsAre("a", "b"));
results = absl::StrSplit("a///b", delim);
EXPECT_THAT(results, ElementsAre("a", "/b"));
results = absl::StrSplit("a////b", delim);
EXPECT_THAT(results, ElementsAre("a", "", "b"));
}
TEST(Split, EmptyResults) {
std::vector<absl::string_view> results;
results = absl::StrSplit("", '#');
EXPECT_THAT(results, ElementsAre(""));
results = absl::StrSplit("#", '#');
EXPECT_THAT(results, ElementsAre("", ""));
results = absl::StrSplit("#cd", '#');
EXPECT_THAT(results, ElementsAre("", "cd"));
results = absl::StrSplit("ab#cd#", '#');
EXPECT_THAT(results, ElementsAre("ab", "cd", ""));
results = absl::StrSplit("ab##cd", '#');
EXPECT_THAT(results, ElementsAre("ab", "", "cd"));
results = absl::StrSplit("ab##", '#');
EXPECT_THAT(results, ElementsAre("ab", "", ""));
results = absl::StrSplit("ab#ab#", '#');
EXPECT_THAT(results, ElementsAre("ab", "ab", ""));
results = absl::StrSplit("aaaa", 'a');
EXPECT_THAT(results, ElementsAre("", "", "", "", ""));
results = absl::StrSplit("", '#', absl::SkipEmpty());
EXPECT_THAT(results, ElementsAre());
}
template <typename Delimiter>
static bool IsFoundAtStartingPos(absl::string_view text, Delimiter d,
size_t starting_pos, int expected_pos) {
absl::string_view found = d.Find(text, starting_pos);
return found.data() != text.data() + text.size() &&
expected_pos == found.data() - text.data();
}
// Helper function for testing Delimiter objects. Returns true if the given
// Delimiter is found in the given string at the given position. This function
// tests two cases:
// 1. The actual text given, staring at position 0
// 2. The text given with leading padding that should be ignored
template <typename Delimiter>
static bool IsFoundAt(absl::string_view text, Delimiter d, int expected_pos) {
const std::string leading_text = ",x,y,z,";
return IsFoundAtStartingPos(text, d, 0, expected_pos) &&
IsFoundAtStartingPos(leading_text + std::string(text), d,
leading_text.length(),
expected_pos + leading_text.length());
}
//
// Tests for ByString
//
// Tests using any delimiter that represents a single comma.
template <typename Delimiter>
void TestComma(Delimiter d) {
EXPECT_TRUE(IsFoundAt(",", d, 0));
EXPECT_TRUE(IsFoundAt("a,", d, 1));
EXPECT_TRUE(IsFoundAt(",b", d, 0));
EXPECT_TRUE(IsFoundAt("a,b", d, 1));
EXPECT_TRUE(IsFoundAt("a,b,", d, 1));
EXPECT_TRUE(IsFoundAt("a,b,c", d, 1));
EXPECT_FALSE(IsFoundAt("", d, -1));
EXPECT_FALSE(IsFoundAt(" ", d, -1));
EXPECT_FALSE(IsFoundAt("a", d, -1));
EXPECT_FALSE(IsFoundAt("a b c", d, -1));
EXPECT_FALSE(IsFoundAt("a;b;c", d, -1));
EXPECT_FALSE(IsFoundAt(";", d, -1));
}
TEST(Delimiter, ByString) {
using absl::ByString;
TestComma(ByString(","));
// Works as named variable.
ByString comma_string(",");
TestComma(comma_string);
// The first occurrence of empty string ("") in a string is at position 0.
// There is a test below that demonstrates this for absl::string_view::find().
// If the ByString delimiter returned position 0 for this, there would
// be an infinite loop in the SplitIterator code. To avoid this, empty string
// is a special case in that it always returns the item at position 1.
absl::string_view abc("abc");
EXPECT_EQ(0, abc.find("")); // "" is found at position 0
ByString empty("");
EXPECT_FALSE(IsFoundAt("", empty, 0));
EXPECT_FALSE(IsFoundAt("a", empty, 0));
EXPECT_TRUE(IsFoundAt("ab", empty, 1));
EXPECT_TRUE(IsFoundAt("abc", empty, 1));
}
TEST(Split, ByChar) {
using absl::ByChar;
TestComma(ByChar(','));
// Works as named variable.
ByChar comma_char(',');
TestComma(comma_char);
}
//
// Tests for ByAnyChar
//
TEST(Delimiter, ByAnyChar) {
using absl::ByAnyChar;
ByAnyChar one_delim(",");
// Found
EXPECT_TRUE(IsFoundAt(",", one_delim, 0));
EXPECT_TRUE(IsFoundAt("a,", one_delim, 1));
EXPECT_TRUE(IsFoundAt("a,b", one_delim, 1));
EXPECT_TRUE(IsFoundAt(",b", one_delim, 0));
// Not found
EXPECT_FALSE(IsFoundAt("", one_delim, -1));
EXPECT_FALSE(IsFoundAt(" ", one_delim, -1));
EXPECT_FALSE(IsFoundAt("a", one_delim, -1));
EXPECT_FALSE(IsFoundAt("a;b;c", one_delim, -1));
EXPECT_FALSE(IsFoundAt(";", one_delim, -1));
ByAnyChar two_delims(",;");
// Found
EXPECT_TRUE(IsFoundAt(",", two_delims, 0));
EXPECT_TRUE(IsFoundAt(";", two_delims, 0));
EXPECT_TRUE(IsFoundAt(",;", two_delims, 0));
EXPECT_TRUE(IsFoundAt(";,", two_delims, 0));
EXPECT_TRUE(IsFoundAt(",;b", two_delims, 0));
EXPECT_TRUE(IsFoundAt(";,b", two_delims, 0));
EXPECT_TRUE(IsFoundAt("a;,", two_delims, 1));
EXPECT_TRUE(IsFoundAt("a,;", two_delims, 1));
EXPECT_TRUE(IsFoundAt("a;,b", two_delims, 1));
EXPECT_TRUE(IsFoundAt("a,;b", two_delims, 1));
// Not found
EXPECT_FALSE(IsFoundAt("", two_delims, -1));
EXPECT_FALSE(IsFoundAt(" ", two_delims, -1));
EXPECT_FALSE(IsFoundAt("a", two_delims, -1));
EXPECT_FALSE(IsFoundAt("a=b=c", two_delims, -1));
EXPECT_FALSE(IsFoundAt("=", two_delims, -1));
// ByAnyChar behaves just like ByString when given a delimiter of empty
// string. That is, it always returns a zero-length absl::string_view
// referring to the item at position 1, not position 0.
ByAnyChar empty("");
EXPECT_FALSE(IsFoundAt("", empty, 0));
EXPECT_FALSE(IsFoundAt("a", empty, 0));
EXPECT_TRUE(IsFoundAt("ab", empty, 1));
EXPECT_TRUE(IsFoundAt("abc", empty, 1));
}
//
// Tests for ByLength
//
TEST(Delimiter, ByLength) {
using absl::ByLength;
ByLength four_char_delim(4);
// Found
EXPECT_TRUE(IsFoundAt("abcde", four_char_delim, 4));
EXPECT_TRUE(IsFoundAt("abcdefghijklmnopqrstuvwxyz", four_char_delim, 4));
EXPECT_TRUE(IsFoundAt("a b,c\nd", four_char_delim, 4));
// Not found
EXPECT_FALSE(IsFoundAt("", four_char_delim, 0));
EXPECT_FALSE(IsFoundAt("a", four_char_delim, 0));
EXPECT_FALSE(IsFoundAt("ab", four_char_delim, 0));
EXPECT_FALSE(IsFoundAt("abc", four_char_delim, 0));
EXPECT_FALSE(IsFoundAt("abcd", four_char_delim, 0));
}
TEST(Split, WorksWithLargeStrings) {
if (sizeof(size_t) > 4) {
std::string s((uint32_t{1} << 31) + 1, 'x'); // 2G + 1 byte
s.back() = '-';
std::vector<absl::string_view> v = absl::StrSplit(s, '-');
EXPECT_EQ(2, v.size());
// The first element will contain 2G of 'x's.
// testing::StartsWith is too slow with a 2G string.
EXPECT_EQ('x', v[0][0]);
EXPECT_EQ('x', v[0][1]);
EXPECT_EQ('x', v[0][3]);
EXPECT_EQ("", v[1]);
}
}
TEST(SplitInternalTest, TypeTraits) {
EXPECT_FALSE(absl::strings_internal::HasMappedType<int>::value);
EXPECT_TRUE(
(absl::strings_internal::HasMappedType<std::map<int, int>>::value));
EXPECT_FALSE(absl::strings_internal::HasValueType<int>::value);
EXPECT_TRUE(
(absl::strings_internal::HasValueType<std::map<int, int>>::value));
EXPECT_FALSE(absl::strings_internal::HasConstIterator<int>::value);
EXPECT_TRUE(
(absl::strings_internal::HasConstIterator<std::map<int, int>>::value));
EXPECT_FALSE(absl::strings_internal::IsInitializerList<int>::value);
EXPECT_TRUE((absl::strings_internal::IsInitializerList<
std::initializer_list<int>>::value));
}
} // namespace
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