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// Copyright (c) 2024-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <util/string.h>
#include <boost/test/unit_test.hpp>
using namespace util;
BOOST_AUTO_TEST_SUITE(util_string_tests)
// Helper to allow compile-time sanity checks while providing the number of
// args directly. Normally PassFmt<sizeof...(Args)> would be used.
template <unsigned NumArgs>
inline void PassFmt(util::ConstevalFormatString<NumArgs> fmt)
{
// This was already executed at compile-time, but is executed again at run-time to avoid -Wunused.
decltype(fmt)::Detail_CheckNumFormatSpecifiers(fmt.fmt);
}
template <unsigned WrongNumArgs>
inline void FailFmtWithError(std::string_view wrong_fmt, std::string_view error)
{
using ErrType = const char*;
auto check_throw{[error](const ErrType& str) { return str == error; }};
BOOST_CHECK_EXCEPTION(util::ConstevalFormatString<WrongNumArgs>::Detail_CheckNumFormatSpecifiers(wrong_fmt), ErrType, check_throw);
}
BOOST_AUTO_TEST_CASE(ConstevalFormatString_NumSpec)
{
PassFmt<0>("");
PassFmt<0>("%%");
PassFmt<1>("%s");
PassFmt<0>("%%s");
PassFmt<0>("s%%");
PassFmt<1>("%%%s");
PassFmt<1>("%s%%");
PassFmt<0>(" 1$s");
PassFmt<1>("%1$s");
PassFmt<1>("%1$s%1$s");
PassFmt<2>("%2$s");
PassFmt<2>("%2$s 4$s %2$s");
PassFmt<129>("%129$s 999$s %2$s");
PassFmt<1>("%02d");
PassFmt<1>("%+2s");
PassFmt<1>("%.6i");
PassFmt<1>("%5.2f");
PassFmt<1>("%#x");
PassFmt<1>("%1$5i");
PassFmt<1>("%1$-5i");
PassFmt<1>("%1$.5i");
// tinyformat accepts almost any "type" spec, even '%', or '_', or '\n'.
PassFmt<1>("%123%");
PassFmt<1>("%123%s");
PassFmt<1>("%_");
PassFmt<1>("%\n");
// The `*` specifier behavior is unsupported and can lead to runtime
// errors when used in a ConstevalFormatString. Please refer to the
// note in the ConstevalFormatString docs.
PassFmt<1>("%*c");
PassFmt<2>("%2$*3$d");
PassFmt<1>("%.*f");
auto err_mix{"Format specifiers must be all positional or all non-positional!"};
FailFmtWithError<1>("%s%1$s", err_mix);
auto err_num{"Format specifier count must match the argument count!"};
FailFmtWithError<1>("", err_num);
FailFmtWithError<0>("%s", err_num);
FailFmtWithError<2>("%s", err_num);
FailFmtWithError<0>("%1$s", err_num);
FailFmtWithError<2>("%1$s", err_num);
auto err_0_pos{"Positional format specifier must have position of at least 1"};
FailFmtWithError<1>("%$s", err_0_pos);
FailFmtWithError<1>("%$", err_0_pos);
FailFmtWithError<0>("%0$", err_0_pos);
FailFmtWithError<0>("%0$s", err_0_pos);
auto err_term{"Format specifier incorrectly terminated by end of string"};
FailFmtWithError<1>("%", err_term);
FailFmtWithError<1>("%1$", err_term);
}
BOOST_AUTO_TEST_SUITE_END()
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