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Restrict fmt::compile to literal strings

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to make sure we don't break the API too much when making all of this
compile-time only.
This commit is contained in:
Victor Zverovich 2019-08-10 13:18:11 -07:00
parent 544b537334
commit e8219952c6
2 changed files with 13 additions and 184 deletions
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40
include/fmt/compile.h
View File

@ -613,44 +613,30 @@ template <typename... Args>
using prepared_format_t = using prepared_format_t =
typename basic_prepared_format<std::string, parts_container<char>, typename basic_prepared_format<std::string, parts_container<char>,
Args...>::type; Args...>::type;
} // namespace internal
#if FMT_USE_CONSTEXPR
template <typename... Args, typename S>
FMT_CONSTEXPR auto compile(S format_str) {
return internal::do_compile<S, Args...>(
typename internal::format_tag<S>::type{}, std::move(format_str));
}
#else
template <typename... Args, typename S> template <typename... Args, typename S>
auto compile(S format_str) -> auto compile(S format_str) ->
typename internal::preparator<S, Args...>::prepared_format_type { typename internal::preparator<S, Args...>::prepared_format_type {
return internal::preparator<S, Args...>::prepare(std::move(format_str)); return internal::preparator<S, Args...>::prepare(std::move(format_str));
} }
} // namespace internal
#if FMT_USE_CONSTEXPR
template <typename... Args, typename S,
FMT_ENABLE_IF(is_compile_string<S>::value)>
FMT_CONSTEXPR auto compile(S format_str) {
return internal::do_compile<S, Args...>(
typename internal::format_tag<S>::type{}, std::move(format_str));
}
#endif #endif
template <typename... Args, typename Char>
auto compile(const Char* format_str) ->
typename internal::preparator<std::basic_string<Char>,
Args...>::prepared_format_type {
return compile<Args...>(internal::to_runtime_format(format_str));
}
template <typename... Args, typename Char, unsigned N> template <typename... Args, typename Char, unsigned N>
auto compile(const Char(format_str)[N]) -> auto compile(const Char (&format_str)[N]) ->
typename internal::preparator<std::basic_string<Char>, typename internal::preparator<std::basic_string<Char>,
Args...>::prepared_format_type { Args...>::prepared_format_type {
const auto view = basic_string_view<Char>(format_str, N); const auto view = basic_string_view<Char>(format_str, N - 1);
return compile<Args...>(internal::to_runtime_format(view)); return internal::compile<Args...>(internal::to_runtime_format(view));
}
template <typename... Args, typename Char>
auto compile(basic_string_view<Char> format_str) ->
typename internal::preparator<std::basic_string<Char>,
Args...>::prepared_format_type {
return compile<Args...>(internal::to_runtime_format(format_str));
} }
template <typename CompiledFormat, typename... Args, template <typename CompiledFormat, typename... Args,

157
test/compile-test.cc
View File

@ -433,72 +433,6 @@ TEST(PrepareTest, CompileTimePreparedPartsTypeProvider) {
} }
#endif #endif
// Use the struct instead of a function to workaround GCC 4.4's 'sorry,
// unimplemented: mangling template_id_expr' issue.
template <typename... Args> struct copied_prepared_format_creator {
static decltype(fmt::compile<Args...>(std::declval<std::string>())) make(
std::string format_str) {
auto prepared_format = fmt::compile<Args...>(std::move(format_str));
auto copied_prepared_format = prepared_format;
prepared_format = fmt::compile<Args...>("");
return copied_prepared_format;
}
};
TEST(PrepareTest, CopyPreparedFormat_InternalStringViewsAreNotInvalidated) {
auto prepared = copied_prepared_format_creator<int, std::string>::make(
"before {} middle {} after");
EXPECT_EQ("before 42 middle text after", fmt::format(prepared, 42, "text"));
prepared = copied_prepared_format_creator<int, std::string>::make(
"before {0} middle {1} after");
EXPECT_EQ("before 42 middle text after", fmt::format(prepared, 42, "text"));
{
typedef decltype(fmt::arg("first", 42)) argument0;
typedef decltype(fmt::arg("second", "text")) argument1;
auto named_prepared =
copied_prepared_format_creator<argument0, argument1>::make(
"before {first} middle {second} after");
EXPECT_EQ("before 42 middle text after",
fmt::format(named_prepared, fmt::arg("first", 42),
fmt::arg("second", "text")));
}
{
typedef decltype(fmt::arg("value", "12345")) argument0;
typedef decltype(fmt::arg("width", 10)) argument1;
auto named_prepared =
copied_prepared_format_creator<argument0, argument1>::make(
">>>{value:>{width}}<<<");
EXPECT_EQ(">>> 12345<<<",
fmt::format(named_prepared, fmt::arg("value", "12345"),
fmt::arg("width", 10)));
}
}
TEST(PrepareTest, ReusedPreparedFormatType) {
using prepared_format = fmt::internal::prepared_format_t<std::string, int>;
prepared_format prepared = fmt::compile<prepared_format>("The {} is {}.");
EXPECT_EQ("The answer is 42.", fmt::format(prepared, "answer", 42));
prepared = fmt::compile<prepared_format>("40 {} 2 = {}");
EXPECT_EQ("40 + 2 = 42", fmt::format(prepared, "+", 42));
}
TEST(PrepareTest, UserProvidedPartsContainerUnderlyingContainer) {
typedef fmt::internal::format_part<char> format_part;
typedef fmt::internal::parts_container<char, std::list<format_part>>
parts_container;
typedef fmt::internal::basic_prepared_format<std::string, parts_container, std::string,
int>::type prepared_format;
prepared_format prepared = fmt::compile<prepared_format>("The {} is {}.");
EXPECT_EQ("The answer is 42.", fmt::format(prepared, "answer", 42));
prepared = fmt::compile<prepared_format>("40 {} 2 = {}");
EXPECT_EQ("40 + 2 = 42", fmt::format(prepared, "+", 42));
}
class custom_parts_container { class custom_parts_container {
public: public:
typedef fmt::internal::format_part<char> format_part_type; typedef fmt::internal::format_part<char> format_part_type;
@ -533,43 +467,6 @@ class custom_parts_container {
parts parts_; parts parts_;
}; };
TEST(PrepareTest, UserProvidedPartsContainer) {
typedef fmt::internal::basic_prepared_format<std::string, custom_parts_container,
std::string, int>::type prepared_format;
prepared_format prepared = fmt::compile<prepared_format>("The {} is {}.");
EXPECT_EQ("The answer is 42.", fmt::format(prepared, "answer", 42));
prepared = fmt::compile<prepared_format>("40 {} 2 = {}");
EXPECT_EQ("40 + 2 = 42", fmt::format(prepared, "+", 42));
}
TEST(PrepareTest, PassConstCharPointerFormat) {
const char* c_format = "test {}";
const auto prepared = fmt::compile<int>(c_format);
EXPECT_EQ("test 42", fmt::format(prepared, 42));
const wchar_t* wc_format = L"test {}";
const auto wprepared = fmt::compile<int>(wc_format);
EXPECT_EQ(L"test 42", fmt::format(wprepared, 42));
}
TEST(PrepareTest, PassCharArrayFormat) {
char c_format[] = "test {}";
const auto prepared = fmt::compile<int>(c_format);
EXPECT_EQ("test 42", fmt::format(prepared, 42));
wchar_t wc_format[] = L"test {}";
const auto wprepared = fmt::compile<int>(wc_format);
EXPECT_EQ(L"test 42", fmt::format(wprepared, 42));
}
TEST(PrepareTest, PassConstCharArrayFormat) {
const char c_format[] = "test {}";
const auto prepared = fmt::compile<int>(c_format);
EXPECT_EQ("test 42", fmt::format(prepared, 42));
const wchar_t wc_format[] = L"test {}";
const auto wprepared = fmt::compile<int>(wc_format);
EXPECT_EQ(L"test 42", fmt::format(wprepared, 42));
}
TEST(PrepareTest, PassStringLiteralFormat) { TEST(PrepareTest, PassStringLiteralFormat) {
const auto prepared = fmt::compile<int>("test {}"); const auto prepared = fmt::compile<int>("test {}");
EXPECT_EQ("test 42", fmt::format(prepared, 42)); EXPECT_EQ("test 42", fmt::format(prepared, 42));
@ -577,22 +474,6 @@ TEST(PrepareTest, PassStringLiteralFormat) {
EXPECT_EQ(L"test 42", fmt::format(wprepared, 42)); EXPECT_EQ(L"test 42", fmt::format(wprepared, 42));
} }
TEST(PrepareTest, PassStringViewFormat) {
const auto prepared =
fmt::compile<int>(fmt::basic_string_view<char>("test {}"));
EXPECT_EQ("test 42", fmt::format(prepared, 42));
const auto wprepared =
fmt::compile<int>(fmt::basic_string_view<wchar_t>(L"test {}"));
EXPECT_EQ(L"test 42", fmt::format(wprepared, 42));
}
TEST(PrepareTest, PassBasicStringFormat) {
const auto prepared = fmt::compile<int>(std::string("test {}"));
EXPECT_EQ("test 42", fmt::format(prepared, 42));
const auto wprepared = fmt::compile<int>(std::wstring(L"test {}"));
EXPECT_EQ(L"test 42", fmt::format(wprepared, 42));
}
#if FMT_USE_CONSTEXPR #if FMT_USE_CONSTEXPR
TEST(PrepareTest, PassCompileString) { TEST(PrepareTest, PassCompileString) {
const auto prepared = fmt::compile<int>(FMT_STRING("test {}")); const auto prepared = fmt::compile<int>(FMT_STRING("test {}"));
@ -602,44 +483,6 @@ TEST(PrepareTest, PassCompileString) {
} }
#endif #endif
template <typename T> struct user_allocator {
typedef T value_type;
typedef value_type* pointer;
typedef const value_type* const_pointer;
typedef value_type& reference;
typedef const value_type& const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
template <typename U> struct rebind { typedef user_allocator<U> other; };
user_allocator() = default;
~user_allocator() = default;
template <typename U> user_allocator(const user_allocator<U>&) {}
pointer allocate(
size_type cnt,
typename std::allocator<fmt::monostate>::const_pointer = nullptr) {
return new value_type[cnt];
}
void deallocate(pointer p, size_type) { delete[] p; }
void construct(pointer p, const value_type& val) { new (p) value_type(val); }
void destroy(pointer p) { (*p).~value_type(); }
bool operator==(const user_allocator&) const { return true; }
bool operator!=(const user_allocator&) const { return false; }
};
TEST(PrepareTest, PassUserTypeFormat) {
typedef std::basic_string<char, std::char_traits<char>, user_allocator<char>>
user_format;
const auto prepared = fmt::compile<int>(user_format("test {}"));
EXPECT_EQ("test 42", fmt::format(prepared, 42));
}
TEST(PrepareTest, FormatToArrayOfChars) { TEST(PrepareTest, FormatToArrayOfChars) {
char buffer[32] = {0}; char buffer[32] = {0};
const auto prepared = fmt::compile<int>("4{}"); const auto prepared = fmt::compile<int>("4{}");