expect.inl
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#ifndef CRUCIBLE_TESTING_EXPECT_INL
#define CRUCIBLE_TESTING_EXPECT_INL
#include "crucible/testing/expect.hpp"
#include <cstdint>
#include <cstring>
#include <iomanip>
#include <memory>
#include <ostream>
#include <sstream>
#include <string>
#include <type_traits>
#include <typeinfo>
namespace crucible::testing::expect {
#ifdef _WIN32
constexpr char SOURCE_FILE_PATH_SEPARATOR { '\\' };
#else
constexpr char SOURCE_FILE_PATH_SEPARATOR { '/' };
#endif // _WIN32
template<typename, typename = void>
struct HasFormatMethod : std::false_type {};
template<typename T>
struct HasFormatMethod<T, std::void_t<decltype(std::declval<T>().format())>> : std::true_type {};
template<typename T>
constexpr bool has_format_method { HasFormatMethod<T>::value };
template<typename, typename = void>
struct HasOstreamInsertion : std::false_type {};
template<typename T>
struct HasOstreamInsertion<T, std::void_t<decltype(std::declval<std::ostream &>() << std::declval<T>())>> : std::true_type {};
template<typename T>
constexpr bool has_ostream_insertion { HasOstreamInsertion<T>::value };
template<typename, typename = void>
struct HasIteration : std::false_type {};
template<typename T>
struct HasIteration<T, std::void_t<decltype(std::begin(std::declval<T>())), decltype(std::end(std::declval<T>()))>> : std::true_type {};
template<typename T>
constexpr bool has_iteration { HasIteration<T>::value };
template<typename T>
auto format_value(T const &value) -> std::string {
if constexpr (has_format_method<T>) {
return value.format();
} else {
std::ostringstream buffer;
if constexpr (has_ostream_insertion<T>) {
if constexpr (std::is_same_v<T, bool>) {
buffer << std::boolalpha << value;
} else {
buffer << value;
}
} else if constexpr(has_iteration<T>) {
buffer << "{";
auto current { std::begin(value) };
auto const end { std::end(value) };
if (current != end) {
buffer
<< format_value(*current);
++current;
}
while (current != end) {
buffer
<< ", "
<< format_value(*current);
++current;
}
buffer << "}";
} else {
std::type_info const &info { typeid(T) };
int const pointer_width { sizeof(void *) * 2 };
auto const pointer { reinterpret_cast<std::uintptr_t>(std::addressof(value)) };
buffer
<< "<"
<< info.name()
<< " "
<< "object at"
<< " "
<< "0x" << std::hex << std::setw(pointer_width) << std::setfill('0') << pointer
<< ">";
}
return buffer.str();
}
}
template<typename T>
auto fail(char const *expression, T const &value, char const *expected, char const *actual, char const *file, int const line, char const *function) -> void {
char const *final_path_separator { std::strrchr(file, SOURCE_FILE_PATH_SEPARATOR) };
char const *truncated_file { final_path_separator ? final_path_separator + 1 : file };
std::ostringstream buffer;
buffer
<< truncated_file << ":" << line << " [" << function << "]: "
<< "Expected `" << expression << "` to be `" << expected << "`, but got `" << actual << "`"
<< " "
<< "[`" << expression << "` = `" << format_value(value) << "`]";
throw ExpectFailed(buffer.str());
}
template<typename LHS, typename RHS>
auto fail_comparison(char const *lhs_expression, char const *rhs_expression, LHS const &lhs_value, RHS const &rhs_value, char const *operation, char const *file, int const line, char const *function) -> void {
char const *final_path_separator { std::strrchr(file, SOURCE_FILE_PATH_SEPARATOR) };
char const *truncated_file { final_path_separator ? final_path_separator + 1 : file };
std::ostringstream buffer;
buffer
<< truncated_file << ":" << line << " [" << function << "]:"
<< " "
<< "Expected `" << lhs_expression << "` " << operation << " `" << rhs_expression << "`"
<< " "
<< "[`" << lhs_expression << "` = `" << format_value(lhs_value) << "`, `" << rhs_expression << "` = `" << format_value(rhs_value) << "`]";
throw ExpectFailed(buffer.str());
}
}
#endif // CRUCIBLE_TESTING_EXPECT_INL