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gcc/libstdc++-v3/testsuite/std/format/parse_ctx.cc
Jonathan Wakely 628ba410b9 libstdc++: Fix P2510R3 "Formatting pointers" [PR110149] 
I had intended to support the P2510R3 proposal unconditionally in C++20
mode, but I left it half implemented. The parse function supported the
new extensions, but the format function didn't.

This adds the missing pieces, and makes it only enabled for C++26 and
non-strict modes.

libstdc++-v3/ChangeLog:

	PR libstdc++/110149
	* include/std/format (formatter<const void*, charT>::parse):
	Only alow 0 and P for C++26 and non-strict modes.
	(formatter<const void*, charT>::format): Use toupper for P
	type, and insert zero-fill characters for 0 option.
	* testsuite/std/format/functions/format.cc: Check pointer
	formatting. Only check P2510R3 extensions conditionally.
	* testsuite/std/format/parse_ctx.cc: Only check P2510R3
	extensions conditionally.
2023-06-09 13:08:25 +01:00

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// { dg-options "-std=gnu++20" }
// { dg-do run { target c++20 } }
#include <format>
#include <testsuite_hooks.h>
template<typename T, bool auto_indexing = true>
bool
is_std_format_spec_for(std::string_view spec)
{
std::format_parse_context pc(spec);
if (auto_indexing)
(void) pc.next_arg_id();
else
pc.check_arg_id(0);
std::formatter<T> f;
try {
auto end = f.parse(pc);
VERIFY( end == spec.end() || *end == '}' );
return true;
} catch (const std::format_error&) {
return false;
}
}
#if __cpp_lib_format_ranges
constexpr bool escaped_strings_supported = true;
#else
constexpr bool escaped_strings_supported = false;
#endif
void
test_char()
{
VERIFY( is_std_format_spec_for<char>("") );
VERIFY( is_std_format_spec_for<char>("<") );
VERIFY( is_std_format_spec_for<char>(">") );
VERIFY( is_std_format_spec_for<char>("^") );
VERIFY( is_std_format_spec_for<char>("0<") );
VERIFY( is_std_format_spec_for<char>("0>") );
VERIFY( is_std_format_spec_for<char>("0^") );
VERIFY( ! is_std_format_spec_for<char>("{^") );
VERIFY( ! is_std_format_spec_for<char>("+") );
VERIFY( ! is_std_format_spec_for<char>("-") );
VERIFY( ! is_std_format_spec_for<char>(" ") );
VERIFY( ! is_std_format_spec_for<char>("#") );
VERIFY( is_std_format_spec_for<char>("0d") );
VERIFY( ! is_std_format_spec_for<char>("0") );
VERIFY( ! is_std_format_spec_for<char>("00d") );
VERIFY( is_std_format_spec_for<char>("01d") );
VERIFY( is_std_format_spec_for<char>("0{}d") );
VERIFY( ! is_std_format_spec_for<char>("0{1}d") );
VERIFY(( is_std_format_spec_for<char, false>("0{1}d") ));
VERIFY( is_std_format_spec_for<char>("1") );
VERIFY( ! is_std_format_spec_for<char>("-1") );
VERIFY( is_std_format_spec_for<char>("-1d") ); // sign and width
VERIFY( ! is_std_format_spec_for<char>(".") );
VERIFY( ! is_std_format_spec_for<char>(".1") );
VERIFY( is_std_format_spec_for<char>("c") );
VERIFY( is_std_format_spec_for<char>("b") );
VERIFY( is_std_format_spec_for<char>("B") );
VERIFY( is_std_format_spec_for<char>("d") );
VERIFY( is_std_format_spec_for<char>("o") );
VERIFY( is_std_format_spec_for<char>("x") );
VERIFY( is_std_format_spec_for<char>("X") );
VERIFY( ! is_std_format_spec_for<char>("s") );
VERIFY( is_std_format_spec_for<char>("?") == escaped_strings_supported );
VERIFY( ! is_std_format_spec_for<char>("a") );
VERIFY( ! is_std_format_spec_for<char>("A") );
VERIFY( ! is_std_format_spec_for<char>("f") );
VERIFY( ! is_std_format_spec_for<char>("F") );
VERIFY( ! is_std_format_spec_for<char>("g") );
VERIFY( ! is_std_format_spec_for<char>("G") );
VERIFY( ! is_std_format_spec_for<char>("+c") );
VERIFY( ! is_std_format_spec_for<char>("+?") );
VERIFY( is_std_format_spec_for<char>("+d") );
}
void
test_int()
{
VERIFY( is_std_format_spec_for<int>("") );
VERIFY( is_std_format_spec_for<int>("<") );
VERIFY( is_std_format_spec_for<int>(">") );
VERIFY( is_std_format_spec_for<int>("^") );
VERIFY( is_std_format_spec_for<int>("0<") );
VERIFY( is_std_format_spec_for<int>("0>") );
VERIFY( is_std_format_spec_for<int>("0^") );
VERIFY( ! is_std_format_spec_for<int>("{^") );
VERIFY( is_std_format_spec_for<int>("+") );
VERIFY( is_std_format_spec_for<int>("-") );
VERIFY( is_std_format_spec_for<int>(" ") );
VERIFY( is_std_format_spec_for<int>("#") );
VERIFY( is_std_format_spec_for<int>("0d") );
VERIFY( is_std_format_spec_for<int>("0") );
VERIFY( ! is_std_format_spec_for<int>("00d") );
VERIFY( is_std_format_spec_for<int>("01d") );
VERIFY( ! is_std_format_spec_for<int>("0{1}d") );
VERIFY(( is_std_format_spec_for<int>("0{}d") ));
VERIFY(( ! is_std_format_spec_for<int>("0{1}d") ));
VERIFY(( is_std_format_spec_for<int, false>("0{1}d") ));
VERIFY( is_std_format_spec_for<int>("1") );
VERIFY( is_std_format_spec_for<int>("-1") ); // sign and width
VERIFY( ! is_std_format_spec_for<int>(".") );
VERIFY( ! is_std_format_spec_for<int>(".1") );
VERIFY( is_std_format_spec_for<int>("c") );
VERIFY( is_std_format_spec_for<int>("b") );
VERIFY( is_std_format_spec_for<int>("B") );
VERIFY( is_std_format_spec_for<int>("d") );
VERIFY( is_std_format_spec_for<int>("o") );
VERIFY( is_std_format_spec_for<int>("x") );
VERIFY( is_std_format_spec_for<int>("X") );
VERIFY( ! is_std_format_spec_for<int>("s") );
VERIFY( ! is_std_format_spec_for<int>("?") );
VERIFY( ! is_std_format_spec_for<int>("a") );
VERIFY( ! is_std_format_spec_for<int>("A") );
VERIFY( ! is_std_format_spec_for<int>("f") );
VERIFY( ! is_std_format_spec_for<int>("F") );
VERIFY( ! is_std_format_spec_for<int>("g") );
VERIFY( ! is_std_format_spec_for<int>("G") );
VERIFY( ! is_std_format_spec_for<int>("p") );
VERIFY( ! is_std_format_spec_for<int>("P") );
VERIFY( is_std_format_spec_for<int>("+c") ); // But LWG 3644 would change it.
VERIFY( ! is_std_format_spec_for<int>("+?") );
VERIFY( is_std_format_spec_for<int>("+d") );
}
void
test_bool()
{
VERIFY( is_std_format_spec_for<bool>("") );
VERIFY( is_std_format_spec_for<bool>("<") );
VERIFY( is_std_format_spec_for<bool>(">") );
VERIFY( is_std_format_spec_for<bool>("^") );
VERIFY( is_std_format_spec_for<bool>("0<") );
VERIFY( is_std_format_spec_for<bool>("0>") );
VERIFY( is_std_format_spec_for<bool>("0^") );
VERIFY( ! is_std_format_spec_for<bool>("{^") );
VERIFY( ! is_std_format_spec_for<bool>("+") );
VERIFY( ! is_std_format_spec_for<bool>("-") );
VERIFY( ! is_std_format_spec_for<bool>(" ") );
VERIFY( ! is_std_format_spec_for<bool>("#") );
VERIFY( is_std_format_spec_for<bool>("0d") );
VERIFY( ! is_std_format_spec_for<bool>("0") );
VERIFY( ! is_std_format_spec_for<bool>("00d") );
VERIFY( is_std_format_spec_for<bool>("01d") );
VERIFY( is_std_format_spec_for<bool>("1") );
VERIFY( ! is_std_format_spec_for<bool>("-1") );
VERIFY( is_std_format_spec_for<bool>("-1d") ); // sign and width
VERIFY( ! is_std_format_spec_for<bool>(".") );
VERIFY( ! is_std_format_spec_for<bool>(".1") );
VERIFY( ! is_std_format_spec_for<bool>("c") );
VERIFY( is_std_format_spec_for<bool>("b") );
VERIFY( is_std_format_spec_for<bool>("B") );
VERIFY( is_std_format_spec_for<bool>("d") );
VERIFY( is_std_format_spec_for<bool>("o") );
VERIFY( is_std_format_spec_for<bool>("x") );
VERIFY( is_std_format_spec_for<bool>("X") );
VERIFY( is_std_format_spec_for<bool>("s") );
VERIFY( ! is_std_format_spec_for<bool>("?") );
VERIFY( ! is_std_format_spec_for<bool>("a") );
VERIFY( ! is_std_format_spec_for<bool>("A") );
VERIFY( ! is_std_format_spec_for<bool>("f") );
VERIFY( ! is_std_format_spec_for<bool>("F") );
VERIFY( ! is_std_format_spec_for<bool>("g") );
VERIFY( ! is_std_format_spec_for<bool>("G") );
VERIFY( ! is_std_format_spec_for<bool>("p") );
VERIFY( ! is_std_format_spec_for<bool>("P") );
VERIFY( ! is_std_format_spec_for<bool>("+s") );
VERIFY( is_std_format_spec_for<bool>("+d") );
}
void
test_float()
{
VERIFY( is_std_format_spec_for<float>("") );
VERIFY( is_std_format_spec_for<float>("<") );
VERIFY( is_std_format_spec_for<float>(">") );
VERIFY( is_std_format_spec_for<float>("^") );
VERIFY( is_std_format_spec_for<float>("0<") );
VERIFY( is_std_format_spec_for<float>("0>") );
VERIFY( is_std_format_spec_for<float>("0^") );
VERIFY( ! is_std_format_spec_for<float>("{^") );
VERIFY( is_std_format_spec_for<float>("+") );
VERIFY( is_std_format_spec_for<float>("-") );
VERIFY( is_std_format_spec_for<float>(" ") );
VERIFY( is_std_format_spec_for<float>("#") );
VERIFY( is_std_format_spec_for<float>("0f") );
VERIFY( is_std_format_spec_for<float>("0") );
VERIFY( ! is_std_format_spec_for<float>("00f") );
VERIFY( is_std_format_spec_for<float>("01f") );
VERIFY( is_std_format_spec_for<float>("0{}f") );
VERIFY( ! is_std_format_spec_for<float>("0{1}f") );
VERIFY( ! is_std_format_spec_for<float>("0{1}f") );
VERIFY(( is_std_format_spec_for<float, false>("0{1}f") ));
VERIFY( is_std_format_spec_for<float>("1") );
VERIFY( is_std_format_spec_for<float>("-1") ); // sign and width
VERIFY( ! is_std_format_spec_for<float>(".") );
VERIFY( is_std_format_spec_for<float>(".1") );
VERIFY( is_std_format_spec_for<float>(".{}") );
VERIFY( ! is_std_format_spec_for<float>(".{1}") );
VERIFY(( is_std_format_spec_for<float, false>(".{1}") ));
VERIFY( is_std_format_spec_for<float>("{}.{}") );
VERIFY(( is_std_format_spec_for<float, false>("{1}.{1}") ));
VERIFY(( is_std_format_spec_for<float, false>("{2}.{1}") ));
VERIFY( ! is_std_format_spec_for<float>("c") );
VERIFY( ! is_std_format_spec_for<float>("b") );
VERIFY( ! is_std_format_spec_for<float>("B") );
VERIFY( ! is_std_format_spec_for<float>("d") );
VERIFY( ! is_std_format_spec_for<float>("o") );
VERIFY( ! is_std_format_spec_for<float>("x") );
VERIFY( ! is_std_format_spec_for<float>("X") );
VERIFY( ! is_std_format_spec_for<float>("s") );
VERIFY( ! is_std_format_spec_for<float>("?") );
VERIFY( is_std_format_spec_for<float>("a") );
VERIFY( is_std_format_spec_for<float>("A") );
VERIFY( is_std_format_spec_for<float>("f") );
VERIFY( is_std_format_spec_for<float>("F") );
VERIFY( is_std_format_spec_for<float>("g") );
VERIFY( is_std_format_spec_for<float>("G") );
VERIFY( ! is_std_format_spec_for<float>("p") );
VERIFY( ! is_std_format_spec_for<float>("P") );
VERIFY( is_std_format_spec_for<float>("+f") );
VERIFY( is_std_format_spec_for<float>("_<+#09.6Lf") );
VERIFY( is_std_format_spec_for<float>("<+#09.6Lf") );
VERIFY( is_std_format_spec_for<float>("<+#9.6Lf") );
VERIFY( is_std_format_spec_for<float>(".0006f") );
}
void
test_pointer()
{
VERIFY( is_std_format_spec_for<void*>("") );
VERIFY( is_std_format_spec_for<void*>("<") );
VERIFY( is_std_format_spec_for<void*>(">") );
VERIFY( is_std_format_spec_for<void*>("^") );
VERIFY( is_std_format_spec_for<void*>("0<") );
VERIFY( is_std_format_spec_for<void*>("0>") );
VERIFY( is_std_format_spec_for<void*>("0^") );
VERIFY( ! is_std_format_spec_for<void*>("{^") );
VERIFY( ! is_std_format_spec_for<void*>("+") );
VERIFY( ! is_std_format_spec_for<void*>("-") );
VERIFY( ! is_std_format_spec_for<void*>(" ") );
VERIFY( ! is_std_format_spec_for<void*>("#") );
VERIFY( is_std_format_spec_for<void*>("1") );
VERIFY( ! is_std_format_spec_for<void*>("-1") );
VERIFY( ! is_std_format_spec_for<void*>("-1p") );
VERIFY( ! is_std_format_spec_for<void*>(".") );
VERIFY( ! is_std_format_spec_for<void*>(".1") );
VERIFY( ! is_std_format_spec_for<void*>("c") );
VERIFY( ! is_std_format_spec_for<void*>("b") );
VERIFY( ! is_std_format_spec_for<void*>("B") );
VERIFY( ! is_std_format_spec_for<void*>("d") );
VERIFY( ! is_std_format_spec_for<void*>("o") );
VERIFY( ! is_std_format_spec_for<void*>("x") );
VERIFY( ! is_std_format_spec_for<void*>("X") );
VERIFY( ! is_std_format_spec_for<void*>("s") );
VERIFY( ! is_std_format_spec_for<void*>("?") );
VERIFY( is_std_format_spec_for<void*>("p") );
VERIFY( ! is_std_format_spec_for<void*>("a") );
VERIFY( ! is_std_format_spec_for<void*>("A") );
VERIFY( ! is_std_format_spec_for<void*>("f") );
VERIFY( ! is_std_format_spec_for<void*>("F") );
VERIFY( ! is_std_format_spec_for<void*>("g") );
VERIFY( ! is_std_format_spec_for<void*>("G") );
VERIFY( ! is_std_format_spec_for<void*>("+p") );
#if __cplusplus > 202302L || ! defined __STRICT_ANSI__
// As an extension, we support P2510R3 Formatting pointers
VERIFY( is_std_format_spec_for<void*>("P") );
VERIFY( is_std_format_spec_for<void*>("0p") );
VERIFY( is_std_format_spec_for<void*>("0P") );
VERIFY( is_std_format_spec_for<void*>("0") );
VERIFY( is_std_format_spec_for<void*>("01p") );
VERIFY( ! is_std_format_spec_for<void*>("00p") );
#endif
}
void
test_string()
{
VERIFY( is_std_format_spec_for<const char*>("") );
VERIFY( is_std_format_spec_for<const char*>("<") );
VERIFY( is_std_format_spec_for<const char*>(">") );
VERIFY( is_std_format_spec_for<const char*>("^") );
VERIFY( is_std_format_spec_for<const char*>("0<") );
VERIFY( is_std_format_spec_for<const char*>("0>") );
VERIFY( is_std_format_spec_for<const char*>("0^") );
VERIFY( ! is_std_format_spec_for<const char*>("{^") );
VERIFY( ! is_std_format_spec_for<const char*>("+") );
VERIFY( ! is_std_format_spec_for<const char*>("-") );
VERIFY( ! is_std_format_spec_for<const char*>(" ") );
VERIFY( ! is_std_format_spec_for<const char*>("#") );
VERIFY( ! is_std_format_spec_for<const char*>("0") );
VERIFY( ! is_std_format_spec_for<const char*>("01s") );
VERIFY( is_std_format_spec_for<const char*>("1") );
VERIFY( ! is_std_format_spec_for<const char*>("-1") );
VERIFY( ! is_std_format_spec_for<const char*>("-1s") );
VERIFY( ! is_std_format_spec_for<const char*>(".") );
VERIFY( is_std_format_spec_for<const char*>(".1") );
VERIFY( is_std_format_spec_for<const char*>(".{}") );
VERIFY(( is_std_format_spec_for<const char*, false>(".{0}") ));
VERIFY(( is_std_format_spec_for<const char*, false>(".{1}") ));
VERIFY( ! is_std_format_spec_for<const char*>("c") );
VERIFY( ! is_std_format_spec_for<const char*>("b") );
VERIFY( ! is_std_format_spec_for<const char*>("B") );
VERIFY( ! is_std_format_spec_for<const char*>("d") );
VERIFY( ! is_std_format_spec_for<const char*>("o") );
VERIFY( ! is_std_format_spec_for<const char*>("x") );
VERIFY( ! is_std_format_spec_for<const char*>("X") );
VERIFY( is_std_format_spec_for<const char*>("s") );
VERIFY( is_std_format_spec_for<const char*>("?") == escaped_strings_supported );
VERIFY( ! is_std_format_spec_for<const char*>("p") );
VERIFY( ! is_std_format_spec_for<const char*>("P") );
VERIFY( ! is_std_format_spec_for<const char*>("a") );
VERIFY( ! is_std_format_spec_for<const char*>("A") );
VERIFY( ! is_std_format_spec_for<const char*>("f") );
VERIFY( ! is_std_format_spec_for<const char*>("F") );
VERIFY( ! is_std_format_spec_for<const char*>("g") );
VERIFY( ! is_std_format_spec_for<const char*>("G") );
VERIFY( is_std_format_spec_for<const char*>("*^6s") );
VERIFY( is_std_format_spec_for<const char*>(">6s") );
VERIFY( is_std_format_spec_for<const char*>("_<6.4?") == escaped_strings_supported );
}
struct S { };
template<>
struct std::formatter<S, char>
{
constexpr std::format_parse_context::iterator
parse(std::format_parse_context& pc)
{
std::string_view spec(pc.begin(), pc.end());
auto p = spec.find('}');
if (p == std::string_view::npos)
p = spec.size();
if (p == 0)
throw std::format_error("empty format-spec");
if (spec != "custom")
throw std::format_error("invalid format-spec");
return pc.begin() + p;
}
std::format_context::iterator
format(const S&, std::format_context&) const;
};
void
test_custom()
{
VERIFY( is_std_format_spec_for<S>("custom") );
VERIFY( ! is_std_format_spec_for<S>("customer") );
VERIFY( ! is_std_format_spec_for<S>("custard") );
VERIFY( ! is_std_format_spec_for<S>("") );
}
int main()
{
test_char();
test_int();
test_bool();
test_float();
test_string();
test_pointer();
test_custom();
}
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