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[libc++] [test] C++03-friendly MAKE_STRING macro.

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Reviewed as part of D114658.
This commit is contained in:
Arthur O'Dwyer 2021-11-26 15:17:21 -05:00
parent 7da4ee6f23
commit a0b50c56d1
1 changed files with 72 additions and 49 deletions
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121
libcxx/test/support/make_string.h
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@ -11,69 +11,92 @@
#include "test_macros.h"
#if TEST_STD_VER < 11
#error This header requires C++11 or greater
#endif
#include <string>
#include <string_view>
#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
#define CHAR8_ONLY(x) x,
#else
#define CHAR8_ONLY(x)
#endif
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
# define IF_WIDE_CHARACTERS(...) __VA_ARGS__
# define MKSTR_WCHAR_ONLY(...) __VA_ARGS__
# define MKSTR_AS_WCHAR_LITERAL(x) TEST_CONCAT(L, x), sizeof(TEST_CONCAT(L, x)) / sizeof(wchar_t) - 1
#else
# define IF_WIDE_CHARACTERS(...) /* nothing */
# define MKSTR_WCHAR_ONLY(...)
#endif
#define MKSTR(Str) \
{ \
Str, IF_WIDE_CHARACTERS(TEST_CONCAT(L, Str),) \
CHAR8_ONLY(TEST_CONCAT(u8, Str)) TEST_CONCAT(u, Str), \
TEST_CONCAT(U, Str) \
}
#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
#define MKSTR_CHAR8_ONLY(...) __VA_ARGS__
#define MKSTR_AS_U8_LITERAL(x) TEST_CONCAT(u8, x), sizeof(TEST_CONCAT(u8, x)) / sizeof(char8_t) - 1
#else
#define MKSTR_CHAR8_ONLY(...)
#endif
#if TEST_STD_VER >= 11
#define MKSTR_CXX11_ONLY(...) __VA_ARGS__
#define MKSTR_AS_U16_LITERAL(x) TEST_CONCAT(u, x), sizeof(TEST_CONCAT(u, x)) / sizeof(char16_t) - 1
#define MKSTR_AS_U32_LITERAL(x) TEST_CONCAT(U, x), sizeof(TEST_CONCAT(U, x)) / sizeof(char32_t) - 1
#else
#define MKSTR_CXX11_ONLY(...)
#endif
#define MKSTR(Str) MultiStringType( \
MKSTR_WCHAR_ONLY(MKSTR_AS_WCHAR_LITERAL(Str),) \
MKSTR_CHAR8_ONLY(MKSTR_AS_U8_LITERAL(Str),) \
MKSTR_CXX11_ONLY(MKSTR_AS_U16_LITERAL(Str), \
MKSTR_AS_U32_LITERAL(Str),) \
Str, sizeof(Str) - 1 \
)
#define MKSTR_LEN(CharT, Str) MKSTR(Str).length((const CharT*)0)
struct MultiStringType {
const char* s;
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
const wchar_t* w;
#endif
#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
const char8_t* u8;
#endif
const char16_t* u16;
const char32_t* u32;
MKSTR_WCHAR_ONLY(const wchar_t* w_; size_t wn_; )
MKSTR_CHAR8_ONLY(const char8_t* u8_; size_t u8n_; )
MKSTR_CXX11_ONLY(const char16_t* u16_; size_t u16n_; )
MKSTR_CXX11_ONLY(const char32_t* u32_; size_t u32n_; )
const char* s_; size_t sn_;
constexpr operator const char*() const { return s; }
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
constexpr operator const wchar_t*() const { return w; }
#endif
#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
constexpr operator const char8_t*() const { return u8; }
#endif
constexpr operator const char16_t*() const { return u16; }
constexpr operator const char32_t*() const { return u32; }
TEST_CONSTEXPR MultiStringType(
MKSTR_WCHAR_ONLY(const wchar_t *w, size_t wn,)
MKSTR_CHAR8_ONLY(const char8_t *u8, size_t u8n,)
MKSTR_CXX11_ONLY(const char16_t *u16, size_t u16n,)
MKSTR_CXX11_ONLY(const char32_t *u32, size_t u32n,)
const char *s, size_t sn)
: MKSTR_WCHAR_ONLY(w_(w), wn_(wn),)
MKSTR_CHAR8_ONLY(u8_(u8), u8n_(u8n),)
MKSTR_CXX11_ONLY(u16_(u16), u16n_(u16n),)
MKSTR_CXX11_ONLY(u32_(u32), u32n_(u32n),)
s_(s), sn_(sn) {}
TEST_CONSTEXPR const char *as_ptr(const char*) const { return s_; }
MKSTR_WCHAR_ONLY(TEST_CONSTEXPR const wchar_t *as_ptr(const wchar_t*) const { return w_; })
MKSTR_CHAR8_ONLY(constexpr const char8_t *as_ptr(const char8_t*) const { return u8_; })
MKSTR_CXX11_ONLY(constexpr const char16_t *as_ptr(const char16_t*) const { return u16_; })
MKSTR_CXX11_ONLY(constexpr const char32_t *as_ptr(const char32_t*) const { return u32_; })
TEST_CONSTEXPR size_t length(const char*) const { return sn_; }
MKSTR_WCHAR_ONLY(TEST_CONSTEXPR size_t length(const wchar_t*) const { return wn_; })
MKSTR_CHAR8_ONLY(constexpr size_t length(const char8_t*) const { return u8n_; })
MKSTR_CXX11_ONLY(constexpr size_t length(const char16_t*) const { return u16n_; })
MKSTR_CXX11_ONLY(constexpr size_t length(const char32_t*) const { return u32n_; })
// These implicit conversions are used by some tests. TODO: maybe eliminate them?
TEST_CONSTEXPR operator const char*() const { return s_; }
MKSTR_WCHAR_ONLY(TEST_CONSTEXPR operator const wchar_t*() const { return w_; })
MKSTR_CHAR8_ONLY(constexpr operator const char8_t*() const { return u8_; })
MKSTR_CXX11_ONLY(constexpr operator const char16_t*() const { return u16_; })
MKSTR_CXX11_ONLY(constexpr operator const char32_t*() const { return u32_; })
};
// Helper to convert a const char* string to a basic_string<CharT>.
// Helper to convert a const char* string to a const CharT*.
// This helper is used in unit tests to make them generic. The input should be
// valid ASCII which means the input is also valid UTF-8.
#define MAKE_STRING(CharT, Str) \
std::basic_string<CharT> { \
static_cast<const CharT*>(MultiStringType MKSTR(Str)) \
}
#define MAKE_STRING_VIEW(CharT, Str) \
std::basic_string_view<CharT> { \
static_cast<const CharT*>(MultiStringType MKSTR(Str)) \
}
// Like MAKE_STRING but converts to a const CharT*.
#define MAKE_CSTRING(CharT, Str) \
static_cast<const CharT*>(MultiStringType MKSTR(Str))
MKSTR(Str).as_ptr((const CharT*)0)
// Like MAKE_CSTRING but makes a basic_string<CharT>. Embedded nulls are OK.
#define MAKE_STRING(CharT, Str) \
std::basic_string<CharT>(MAKE_CSTRING(CharT, Str), MKSTR_LEN(CharT, Str))
// Like MAKE_CSTRING but makes a basic_string_view<CharT>. Embedded nulls are OK.
#define MAKE_STRING_VIEW(CharT, Str) \
std::basic_string_view<CharT>(MAKE_CSTRING(CharT, Str), MKSTR_LEN(CharT, Str))
#endif