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// { dg-options "-std=gnu++20" }
// { dg-do run { target c++20 } }
#include <format>
#include <testsuite_hooks.h>
template<typename... Args>
bool
is_format_string_for(const char* str, Args&&... args)
{
try {
(void) std::vformat(str, std::make_format_args(args...));
return true;
} catch (const std::format_error&) {
return false;
}
}
void
test_no_args()
{
VERIFY( is_format_string_for("") );
VERIFY( is_format_string_for("chars") );
VERIFY( is_format_string_for(" The Great Escape {{}} ") );
VERIFY( ! is_format_string_for("{") );
VERIFY( ! is_format_string_for("}") );
VERIFY( ! is_format_string_for("}{") );
VERIFY( ! is_format_string_for("{{}") );
VERIFY( ! is_format_string_for("{{{") );
VERIFY( ! is_format_string_for("{{{{{") );
}
void
test_indexing()
{
VERIFY( is_format_string_for("{} to {}", "a", "b") ); // automatic indexing
VERIFY( is_format_string_for("{1} to {0}", "a", "b") ); // manual indexing
VERIFY( ! is_format_string_for("{0} to {}", "a", "b") ); // mixed indexing
VERIFY( ! is_format_string_for("{} to {1}", "a", "b") ); // mixed indexing
VERIFY( is_format_string_for("{} {} {}", 1, 2, 3) );
VERIFY( is_format_string_for("{} {} {}", 1, 2, 3, 4) );
VERIFY( is_format_string_for("{0} {1} {2}", 1, 2, 3, 4) );
VERIFY( is_format_string_for("{1} {2} {3}", 1, 2, 3, 4) );
VERIFY( is_format_string_for("{3} {3} {3}", 1, 2, 3, 4) );
VERIFY( ! is_format_string_for("{2}", 1, 2) );
VERIFY( ! is_format_string_for("{0} {}", 1) );
VERIFY( ! is_format_string_for("{} {0}", 1) );
}
#if __cpp_lib_format_ranges
constexpr bool escaped_strings_supported = true;
#else
constexpr bool escaped_strings_supported = false;
#endif
void
test_format_spec()
{
VERIFY( is_format_string_for("{:}", 1) );
VERIFY( is_format_string_for("{0:}", 1) );
VERIFY( is_format_string_for("{2:}", 1, 2, 3) );
VERIFY( is_format_string_for("{0:s} {0:}", "str") );
VERIFY( is_format_string_for("{0:} {0:c}", 'c') );
VERIFY( is_format_string_for("{0:p} {0:}", nullptr) );
VERIFY( is_format_string_for("{:d} {:+d}", true, true) );
VERIFY( is_format_string_for("{:0<-#03Ld}", 1) );
VERIFY( is_format_string_for("{1:0<-#03.4Lf}", 1, 2.3) );
VERIFY( is_format_string_for("{1:3.3f}", 1, 2.3) );
VERIFY( is_format_string_for("{:#d}", 'c') );
VERIFY( is_format_string_for("{:#d}", true) );
VERIFY( is_format_string_for("{0:s} {0:?}", "str") == escaped_strings_supported );
VERIFY( is_format_string_for("{0:} {0:?}", 'c') == escaped_strings_supported );
// Invalid sign options.
VERIFY( ! is_format_string_for("{:+}", "str") );
VERIFY( ! is_format_string_for("{:+s}", "str") );
VERIFY( ! is_format_string_for("{:+}", 'c') );
VERIFY( ! is_format_string_for("{:+c}", 'c') );
VERIFY( ! is_format_string_for("{:+p}", nullptr) );
VERIFY( ! is_format_string_for("{:+}", true) );
VERIFY( ! is_format_string_for("{:+s}", true) );
VERIFY( ! is_format_string_for("{:+?}", "str") );
VERIFY( ! is_format_string_for("{:+?}", 'c') );
// Invalid alternate forms.
VERIFY( ! is_format_string_for("{:#}", "str") );
VERIFY( ! is_format_string_for("{:#s}", "str") );
VERIFY( ! is_format_string_for("{:#}", 'c') );
VERIFY( ! is_format_string_for("{:#c}", 'c') );
VERIFY( ! is_format_string_for("{:#}", true) );
VERIFY( ! is_format_string_for("{:#s}", true) );
VERIFY( ! is_format_string_for("{:#}", nullptr) );
VERIFY( ! is_format_string_for("{:#p}", nullptr) );
VERIFY( ! is_format_string_for("{:#?}", "str") );
VERIFY( ! is_format_string_for("{:#?}", 'c') );
// Precision only valid for string and floating-point types.
VERIFY( ! is_format_string_for("{:.3d}", 1) );
VERIFY( ! is_format_string_for("{:3.3d}", 1) );
VERIFY( is_format_string_for("{:3.3s}", "str") );
VERIFY( ! is_format_string_for("{:3.3s}", 'c') );
VERIFY( ! is_format_string_for("{:3.3p}", nullptr) );
// Invalid presentation types for integers.
VERIFY( ! is_format_string_for("{:f}", 1) );
VERIFY( ! is_format_string_for("{:s}", 1) );
VERIFY( ! is_format_string_for("{:g}", 1) );
VERIFY( ! is_format_string_for("{:E}", 1) );
VERIFY( ! is_format_string_for("{:D}", 1) );
// Invalid presentation types for floating-point types.
VERIFY( ! is_format_string_for("{:d}", 1.2) );
VERIFY( ! is_format_string_for("{:b}", 1.2) );
VERIFY( ! is_format_string_for("{:x}", 1.2) );
VERIFY( ! is_format_string_for("{:s}", 1.2) );
// Invalid presentation types for strings.
VERIFY( ! is_format_string_for("{:S}", "str") );
VERIFY( ! is_format_string_for("{:d}", "str") );
}
int main()
{
test_no_args();
test_indexing();
test_format_spec();
}
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