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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#include <catch2/catch_test_macros.hpp>
#include <catch2/internal/catch_stringref.hpp>
#include <cstring>
TEST_CASE( "StringRef", "[Strings][StringRef]" ) {
using Catch::StringRef;
SECTION( "Empty string" ) {
StringRef empty;
REQUIRE( empty.empty() );
REQUIRE( empty.size() == 0 );
REQUIRE( std::strcmp( empty.data(), "" ) == 0 );
}
SECTION( "From string literal" ) {
StringRef s = "hello";
REQUIRE( s.empty() == false );
REQUIRE( s.size() == 5 );
auto rawChars = s.data();
REQUIRE( std::strcmp( rawChars, "hello" ) == 0 );
REQUIRE(s.data() == rawChars);
}
SECTION( "From sub-string" ) {
StringRef original = StringRef( "original string" ).substr(0, 8);
REQUIRE( original == "original" );
REQUIRE_NOTHROW(original.data());
}
SECTION( "Copy construction is shallow" ) {
StringRef original = StringRef( "original string" );
StringRef copy = original;
REQUIRE(original.begin() == copy.begin());
}
SECTION( "Copy assignment is shallow" ) {
StringRef original = StringRef( "original string" );
StringRef copy;
copy = original;
REQUIRE(original.begin() == copy.begin());
}
SECTION( "Substrings" ) {
StringRef s = "hello world!";
StringRef ss = s.substr(0, 5);
SECTION( "zero-based substring" ) {
REQUIRE( ss.empty() == false );
REQUIRE( ss.size() == 5 );
REQUIRE( std::strncmp( ss.data(), "hello", 5 ) == 0 );
REQUIRE( ss == "hello" );
}
SECTION( "non-zero-based substring") {
ss = s.substr( 6, 6 );
REQUIRE( ss.size() == 6 );
REQUIRE( std::strcmp( ss.data(), "world!" ) == 0 );
}
SECTION( "Pointer values of full refs should match" ) {
StringRef s2 = s;
REQUIRE( s.data() == s2.data() );
}
SECTION( "Pointer values of substring refs should also match" ) {
REQUIRE( s.data() == ss.data() );
}
SECTION("Past the end substring") {
REQUIRE(s.substr(s.size() + 1, 123).empty());
}
SECTION("Substring off the end are trimmed") {
ss = s.substr(6, 123);
REQUIRE(std::strcmp(ss.data(), "world!") == 0);
}
SECTION("substring start after the end is empty") {
REQUIRE(s.substr(1'000'000, 1).empty());
}
}
SECTION( "Comparisons are deep" ) {
char buffer1[] = "Hello";
char buffer2[] = "Hello";
CHECK(reinterpret_cast<char*>(buffer1) != reinterpret_cast<char*>(buffer2));
StringRef left(buffer1), right(buffer2);
REQUIRE( left == right );
REQUIRE(left != left.substr(0, 3));
}
SECTION( "from std::string" ) {
std::string stdStr = "a standard string";
SECTION( "implicitly constructed" ) {
StringRef sr = stdStr;
REQUIRE( sr == "a standard string" );
REQUIRE( sr.size() == stdStr.size() );
}
SECTION( "explicitly constructed" ) {
StringRef sr( stdStr );
REQUIRE( sr == "a standard string" );
REQUIRE( sr.size() == stdStr.size() );
}
SECTION( "assigned" ) {
StringRef sr;
sr = stdStr;
REQUIRE( sr == "a standard string" );
REQUIRE( sr.size() == stdStr.size() );
}
}
SECTION( "to std::string" ) {
StringRef sr = "a stringref";
SECTION( "explicitly constructed" ) {
std::string stdStr( sr );
REQUIRE( stdStr == "a stringref" );
REQUIRE( stdStr.size() == sr.size() );
}
SECTION( "assigned" ) {
std::string stdStr;
stdStr = static_cast<std::string>(sr);
REQUIRE( stdStr == "a stringref" );
REQUIRE( stdStr.size() == sr.size() );
}
}
SECTION("std::string += StringRef") {
StringRef sr = "the stringref contents";
std::string lhs("some string += ");
lhs += sr;
REQUIRE(lhs == "some string += the stringref contents");
}
SECTION("StringRef + StringRef") {
StringRef sr1 = "abraka", sr2 = "dabra";
std::string together = sr1 + sr2;
REQUIRE(together == "abrakadabra");
}
}
TEST_CASE("StringRef at compilation time", "[Strings][StringRef][constexpr]") {
using Catch::StringRef;
SECTION("Simple constructors") {
constexpr StringRef empty{};
STATIC_REQUIRE(empty.size() == 0);
STATIC_REQUIRE(empty.begin() == empty.end());
constexpr char const* const abc = "abc";
constexpr StringRef stringref(abc, 3);
STATIC_REQUIRE(stringref.size() == 3);
STATIC_REQUIRE(stringref.data() == abc);
STATIC_REQUIRE(stringref.begin() == abc);
STATIC_REQUIRE(stringref.begin() != stringref.end());
STATIC_REQUIRE(stringref.substr(10, 0).empty());
STATIC_REQUIRE(stringref.substr(2, 1).data() == abc + 2);
STATIC_REQUIRE(stringref[1] == 'b');
constexpr StringRef shortened(abc, 2);
STATIC_REQUIRE(shortened.size() == 2);
STATIC_REQUIRE(shortened.data() == abc);
STATIC_REQUIRE(shortened.begin() != shortened.end());
}
SECTION("UDL construction") {
constexpr auto sr1 = "abc"_catch_sr;
STATIC_REQUIRE_FALSE(sr1.empty());
STATIC_REQUIRE(sr1.size() == 3);
using Catch::operator""_sr;
constexpr auto sr2 = ""_sr;
STATIC_REQUIRE(sr2.empty());
STATIC_REQUIRE(sr2.size() == 0);
}
}
TEST_CASE("StringRef::compare", "[Strings][StringRef][approvals]") {
using Catch::StringRef;
SECTION("Same length on both sides") {
StringRef sr1("abcdc");
StringRef sr2("abcdd");
StringRef sr3("abcdc");
REQUIRE(sr1.compare(sr2) < 0);
REQUIRE(sr2.compare(sr1) > 0);
REQUIRE(sr1.compare(sr3) == 0);
REQUIRE(sr3.compare(sr1) == 0);
}
SECTION("Different lengths") {
StringRef sr1("def");
StringRef sr2("deff");
StringRef sr3("ab");
REQUIRE(sr1.compare(sr2) < 0);
REQUIRE(sr2.compare(sr1) > 0);
REQUIRE(sr1.compare(sr3) > 0);
REQUIRE(sr2.compare(sr3) > 0);
REQUIRE(sr3.compare(sr1) < 0);
REQUIRE(sr3.compare(sr2) < 0);
}
}
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