536 lines
18 KiB
C
536 lines
18 KiB
C
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// Formatting library for C++ - experimental format string compilation
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//
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// Copyright (c) 2012 - present, Victor Zverovich and fmt contributors
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#ifndef FMT_COMPILE_H_
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#define FMT_COMPILE_H_
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#include "format.h"
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FMT_BEGIN_NAMESPACE
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namespace detail {
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template <typename Char, typename InputIt>
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FMT_CONSTEXPR inline auto copy_str(InputIt begin, InputIt end,
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counting_iterator it) -> counting_iterator {
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return it + (end - begin);
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}
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// A compile-time string which is compiled into fast formatting code.
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class compiled_string {};
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template <typename S>
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struct is_compiled_string : std::is_base_of<compiled_string, S> {};
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/**
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\rst
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Converts a string literal *s* into a format string that will be parsed at
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compile time and converted into efficient formatting code. Requires C++17
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``constexpr if`` compiler support.
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**Example**::
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// Converts 42 into std::string using the most efficient method and no
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// runtime format string processing.
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std::string s = fmt::format(FMT_COMPILE("{}"), 42);
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\endrst
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*/
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#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
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# define FMT_COMPILE(s) \
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FMT_STRING_IMPL(s, fmt::detail::compiled_string, explicit)
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#else
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# define FMT_COMPILE(s) FMT_STRING(s)
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#endif
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#if FMT_USE_NONTYPE_TEMPLATE_ARGS
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template <typename Char, size_t N,
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fmt::detail_exported::fixed_string<Char, N> Str>
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struct udl_compiled_string : compiled_string {
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using char_type = Char;
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explicit constexpr operator basic_string_view<char_type>() const {
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return {Str.data, N - 1};
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}
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};
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#endif
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template <typename T, typename... Tail>
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auto first(const T& value, const Tail&...) -> const T& {
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return value;
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}
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#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
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template <typename... Args> struct type_list {};
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// Returns a reference to the argument at index N from [first, rest...].
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template <int N, typename T, typename... Args>
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constexpr const auto& get([[maybe_unused]] const T& first,
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[[maybe_unused]] const Args&... rest) {
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static_assert(N < 1 + sizeof...(Args), "index is out of bounds");
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if constexpr (N == 0)
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return first;
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else
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return detail::get<N - 1>(rest...);
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}
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template <typename Char, typename... Args>
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constexpr int get_arg_index_by_name(basic_string_view<Char> name,
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type_list<Args...>) {
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return get_arg_index_by_name<Args...>(name);
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}
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template <int N, typename> struct get_type_impl;
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template <int N, typename... Args> struct get_type_impl<N, type_list<Args...>> {
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using type =
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remove_cvref_t<decltype(detail::get<N>(std::declval<Args>()...))>;
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};
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template <int N, typename T>
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using get_type = typename get_type_impl<N, T>::type;
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template <typename T> struct is_compiled_format : std::false_type {};
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template <typename Char> struct text {
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basic_string_view<Char> data;
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using char_type = Char;
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template <typename OutputIt, typename... Args>
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constexpr OutputIt format(OutputIt out, const Args&...) const {
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return write<Char>(out, data);
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}
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};
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template <typename Char>
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struct is_compiled_format<text<Char>> : std::true_type {};
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template <typename Char>
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constexpr text<Char> make_text(basic_string_view<Char> s, size_t pos,
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size_t size) {
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return {{&s[pos], size}};
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}
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template <typename Char> struct code_unit {
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Char value;
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using char_type = Char;
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template <typename OutputIt, typename... Args>
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constexpr OutputIt format(OutputIt out, const Args&...) const {
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*out++ = value;
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return out;
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}
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};
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// This ensures that the argument type is convertible to `const T&`.
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template <typename T, int N, typename... Args>
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constexpr const T& get_arg_checked(const Args&... args) {
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const auto& arg = detail::get<N>(args...);
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if constexpr (detail::is_named_arg<remove_cvref_t<decltype(arg)>>()) {
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return arg.value;
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} else {
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return arg;
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}
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}
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template <typename Char>
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struct is_compiled_format<code_unit<Char>> : std::true_type {};
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// A replacement field that refers to argument N.
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template <typename Char, typename T, int N> struct field {
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using char_type = Char;
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template <typename OutputIt, typename... Args>
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constexpr OutputIt format(OutputIt out, const Args&... args) const {
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const T& arg = get_arg_checked<T, N>(args...);
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if constexpr (std::is_convertible_v<T, basic_string_view<Char>>) {
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auto s = basic_string_view<Char>(arg);
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return copy_str<Char>(s.begin(), s.end(), out);
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}
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return write<Char>(out, arg);
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}
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};
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template <typename Char, typename T, int N>
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struct is_compiled_format<field<Char, T, N>> : std::true_type {};
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// A replacement field that refers to argument with name.
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template <typename Char> struct runtime_named_field {
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using char_type = Char;
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basic_string_view<Char> name;
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template <typename OutputIt, typename T>
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constexpr static bool try_format_argument(
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OutputIt& out,
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// [[maybe_unused]] due to unused-but-set-parameter warning in GCC 7,8,9
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[[maybe_unused]] basic_string_view<Char> arg_name, const T& arg) {
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if constexpr (is_named_arg<typename std::remove_cv<T>::type>::value) {
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if (arg_name == arg.name) {
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out = write<Char>(out, arg.value);
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return true;
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}
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}
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return false;
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}
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template <typename OutputIt, typename... Args>
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constexpr OutputIt format(OutputIt out, const Args&... args) const {
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bool found = (try_format_argument(out, name, args) || ...);
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if (!found) {
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FMT_THROW(format_error("argument with specified name is not found"));
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}
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return out;
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}
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};
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template <typename Char>
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struct is_compiled_format<runtime_named_field<Char>> : std::true_type {};
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// A replacement field that refers to argument N and has format specifiers.
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template <typename Char, typename T, int N> struct spec_field {
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using char_type = Char;
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formatter<T, Char> fmt;
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template <typename OutputIt, typename... Args>
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constexpr FMT_INLINE OutputIt format(OutputIt out,
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const Args&... args) const {
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const auto& vargs =
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fmt::make_format_args<basic_format_context<OutputIt, Char>>(args...);
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basic_format_context<OutputIt, Char> ctx(out, vargs);
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return fmt.format(get_arg_checked<T, N>(args...), ctx);
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}
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};
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template <typename Char, typename T, int N>
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struct is_compiled_format<spec_field<Char, T, N>> : std::true_type {};
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template <typename L, typename R> struct concat {
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L lhs;
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R rhs;
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using char_type = typename L::char_type;
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template <typename OutputIt, typename... Args>
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constexpr OutputIt format(OutputIt out, const Args&... args) const {
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out = lhs.format(out, args...);
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return rhs.format(out, args...);
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}
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};
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template <typename L, typename R>
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struct is_compiled_format<concat<L, R>> : std::true_type {};
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template <typename L, typename R>
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constexpr concat<L, R> make_concat(L lhs, R rhs) {
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return {lhs, rhs};
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}
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struct unknown_format {};
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template <typename Char>
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constexpr size_t parse_text(basic_string_view<Char> str, size_t pos) {
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for (size_t size = str.size(); pos != size; ++pos) {
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if (str[pos] == '{' || str[pos] == '}') break;
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}
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return pos;
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}
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template <typename Args, size_t POS, int ID, typename S>
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constexpr auto compile_format_string(S format_str);
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template <typename Args, size_t POS, int ID, typename T, typename S>
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constexpr auto parse_tail(T head, S format_str) {
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if constexpr (POS !=
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basic_string_view<typename S::char_type>(format_str).size()) {
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constexpr auto tail = compile_format_string<Args, POS, ID>(format_str);
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if constexpr (std::is_same<remove_cvref_t<decltype(tail)>,
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unknown_format>())
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return tail;
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else
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return make_concat(head, tail);
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} else {
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return head;
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}
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}
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template <typename T, typename Char> struct parse_specs_result {
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formatter<T, Char> fmt;
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size_t end;
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int next_arg_id;
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};
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enum { manual_indexing_id = -1 };
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template <typename T, typename Char>
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constexpr parse_specs_result<T, Char> parse_specs(basic_string_view<Char> str,
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size_t pos, int next_arg_id) {
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str.remove_prefix(pos);
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auto ctx =
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compile_parse_context<Char>(str, max_value<int>(), nullptr, next_arg_id);
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auto f = formatter<T, Char>();
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auto end = f.parse(ctx);
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return {f, pos + fmt::detail::to_unsigned(end - str.data()),
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next_arg_id == 0 ? manual_indexing_id : ctx.next_arg_id()};
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}
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template <typename Char> struct arg_id_handler {
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arg_ref<Char> arg_id;
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constexpr int on_auto() {
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FMT_ASSERT(false, "handler cannot be used with automatic indexing");
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return 0;
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}
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constexpr int on_index(int id) {
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arg_id = arg_ref<Char>(id);
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return 0;
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}
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constexpr int on_name(basic_string_view<Char> id) {
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arg_id = arg_ref<Char>(id);
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return 0;
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}
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};
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template <typename Char> struct parse_arg_id_result {
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arg_ref<Char> arg_id;
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const Char* arg_id_end;
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};
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template <int ID, typename Char>
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constexpr auto parse_arg_id(const Char* begin, const Char* end) {
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auto handler = arg_id_handler<Char>{arg_ref<Char>{}};
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auto arg_id_end = parse_arg_id(begin, end, handler);
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return parse_arg_id_result<Char>{handler.arg_id, arg_id_end};
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}
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template <typename T, typename Enable = void> struct field_type {
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using type = remove_cvref_t<T>;
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};
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template <typename T>
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struct field_type<T, enable_if_t<detail::is_named_arg<T>::value>> {
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using type = remove_cvref_t<decltype(T::value)>;
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};
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template <typename T, typename Args, size_t END_POS, int ARG_INDEX, int NEXT_ID,
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typename S>
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constexpr auto parse_replacement_field_then_tail(S format_str) {
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using char_type = typename S::char_type;
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constexpr auto str = basic_string_view<char_type>(format_str);
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constexpr char_type c = END_POS != str.size() ? str[END_POS] : char_type();
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if constexpr (c == '}') {
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return parse_tail<Args, END_POS + 1, NEXT_ID>(
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field<char_type, typename field_type<T>::type, ARG_INDEX>(),
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format_str);
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} else if constexpr (c != ':') {
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FMT_THROW(format_error("expected ':'"));
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} else {
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constexpr auto result = parse_specs<typename field_type<T>::type>(
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str, END_POS + 1, NEXT_ID == manual_indexing_id ? 0 : NEXT_ID);
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if constexpr (result.end >= str.size() || str[result.end] != '}') {
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FMT_THROW(format_error("expected '}'"));
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return 0;
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} else {
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return parse_tail<Args, result.end + 1, result.next_arg_id>(
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spec_field<char_type, typename field_type<T>::type, ARG_INDEX>{
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result.fmt},
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format_str);
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}
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}
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}
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// Compiles a non-empty format string and returns the compiled representation
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// or unknown_format() on unrecognized input.
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template <typename Args, size_t POS, int ID, typename S>
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constexpr auto compile_format_string(S format_str) {
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using char_type = typename S::char_type;
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constexpr auto str = basic_string_view<char_type>(format_str);
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if constexpr (str[POS] == '{') {
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if constexpr (POS + 1 == str.size())
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FMT_THROW(format_error("unmatched '{' in format string"));
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if constexpr (str[POS + 1] == '{') {
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return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), format_str);
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} else if constexpr (str[POS + 1] == '}' || str[POS + 1] == ':') {
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static_assert(ID != manual_indexing_id,
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"cannot switch from manual to automatic argument indexing");
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constexpr auto next_id =
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ID != manual_indexing_id ? ID + 1 : manual_indexing_id;
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return parse_replacement_field_then_tail<get_type<ID, Args>, Args,
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POS + 1, ID, next_id>(
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format_str);
|
||
|
|
} else {
|
||
|
|
constexpr auto arg_id_result =
|
||
|
|
parse_arg_id<ID>(str.data() + POS + 1, str.data() + str.size());
|
||
|
|
constexpr auto arg_id_end_pos = arg_id_result.arg_id_end - str.data();
|
||
|
|
constexpr char_type c =
|
||
|
|
arg_id_end_pos != str.size() ? str[arg_id_end_pos] : char_type();
|
||
|
|
static_assert(c == '}' || c == ':', "missing '}' in format string");
|
||
|
|
if constexpr (arg_id_result.arg_id.kind == arg_id_kind::index) {
|
||
|
|
static_assert(
|
||
|
|
ID == manual_indexing_id || ID == 0,
|
||
|
|
"cannot switch from automatic to manual argument indexing");
|
||
|
|
constexpr auto arg_index = arg_id_result.arg_id.val.index;
|
||
|
|
return parse_replacement_field_then_tail<get_type<arg_index, Args>,
|
||
|
|
Args, arg_id_end_pos,
|
||
|
|
arg_index, manual_indexing_id>(
|
||
|
|
format_str);
|
||
|
|
} else if constexpr (arg_id_result.arg_id.kind == arg_id_kind::name) {
|
||
|
|
constexpr auto arg_index =
|
||
|
|
get_arg_index_by_name(arg_id_result.arg_id.val.name, Args{});
|
||
|
|
if constexpr (arg_index >= 0) {
|
||
|
|
constexpr auto next_id =
|
||
|
|
ID != manual_indexing_id ? ID + 1 : manual_indexing_id;
|
||
|
|
return parse_replacement_field_then_tail<
|
||
|
|
decltype(get_type<arg_index, Args>::value), Args, arg_id_end_pos,
|
||
|
|
arg_index, next_id>(format_str);
|
||
|
|
} else if constexpr (c == '}') {
|
||
|
|
return parse_tail<Args, arg_id_end_pos + 1, ID>(
|
||
|
|
runtime_named_field<char_type>{arg_id_result.arg_id.val.name},
|
||
|
|
format_str);
|
||
|
|
} else if constexpr (c == ':') {
|
||
|
|
return unknown_format(); // no type info for specs parsing
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else if constexpr (str[POS] == '}') {
|
||
|
|
if constexpr (POS + 1 == str.size())
|
||
|
|
FMT_THROW(format_error("unmatched '}' in format string"));
|
||
|
|
return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), format_str);
|
||
|
|
} else {
|
||
|
|
constexpr auto end = parse_text(str, POS + 1);
|
||
|
|
if constexpr (end - POS > 1) {
|
||
|
|
return parse_tail<Args, end, ID>(make_text(str, POS, end - POS),
|
||
|
|
format_str);
|
||
|
|
} else {
|
||
|
|
return parse_tail<Args, end, ID>(code_unit<char_type>{str[POS]},
|
||
|
|
format_str);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename... Args, typename S,
|
||
|
|
FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
|
||
|
|
constexpr auto compile(S format_str) {
|
||
|
|
constexpr auto str = basic_string_view<typename S::char_type>(format_str);
|
||
|
|
if constexpr (str.size() == 0) {
|
||
|
|
return detail::make_text(str, 0, 0);
|
||
|
|
} else {
|
||
|
|
constexpr auto result =
|
||
|
|
detail::compile_format_string<detail::type_list<Args...>, 0, 0>(
|
||
|
|
format_str);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif // defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
|
||
|
|
} // namespace detail
|
||
|
|
|
||
|
|
FMT_BEGIN_EXPORT
|
||
|
|
|
||
|
|
#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
|
||
|
|
|
||
|
|
template <typename CompiledFormat, typename... Args,
|
||
|
|
typename Char = typename CompiledFormat::char_type,
|
||
|
|
FMT_ENABLE_IF(detail::is_compiled_format<CompiledFormat>::value)>
|
||
|
|
FMT_INLINE std::basic_string<Char> format(const CompiledFormat& cf,
|
||
|
|
const Args&... args) {
|
||
|
|
auto s = std::basic_string<Char>();
|
||
|
|
cf.format(std::back_inserter(s), args...);
|
||
|
|
return s;
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename OutputIt, typename CompiledFormat, typename... Args,
|
||
|
|
FMT_ENABLE_IF(detail::is_compiled_format<CompiledFormat>::value)>
|
||
|
|
constexpr FMT_INLINE OutputIt format_to(OutputIt out, const CompiledFormat& cf,
|
||
|
|
const Args&... args) {
|
||
|
|
return cf.format(out, args...);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename S, typename... Args,
|
||
|
|
FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
|
||
|
|
FMT_INLINE std::basic_string<typename S::char_type> format(const S&,
|
||
|
|
Args&&... args) {
|
||
|
|
if constexpr (std::is_same<typename S::char_type, char>::value) {
|
||
|
|
constexpr auto str = basic_string_view<typename S::char_type>(S());
|
||
|
|
if constexpr (str.size() == 2 && str[0] == '{' && str[1] == '}') {
|
||
|
|
const auto& first = detail::first(args...);
|
||
|
|
if constexpr (detail::is_named_arg<
|
||
|
|
remove_cvref_t<decltype(first)>>::value) {
|
||
|
|
return fmt::to_string(first.value);
|
||
|
|
} else {
|
||
|
|
return fmt::to_string(first);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
constexpr auto compiled = detail::compile<Args...>(S());
|
||
|
|
if constexpr (std::is_same<remove_cvref_t<decltype(compiled)>,
|
||
|
|
detail::unknown_format>()) {
|
||
|
|
return fmt::format(
|
||
|
|
static_cast<basic_string_view<typename S::char_type>>(S()),
|
||
|
|
std::forward<Args>(args)...);
|
||
|
|
} else {
|
||
|
|
return fmt::format(compiled, std::forward<Args>(args)...);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename OutputIt, typename S, typename... Args,
|
||
|
|
FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
|
||
|
|
FMT_CONSTEXPR OutputIt format_to(OutputIt out, const S&, Args&&... args) {
|
||
|
|
constexpr auto compiled = detail::compile<Args...>(S());
|
||
|
|
if constexpr (std::is_same<remove_cvref_t<decltype(compiled)>,
|
||
|
|
detail::unknown_format>()) {
|
||
|
|
return fmt::format_to(
|
||
|
|
out, static_cast<basic_string_view<typename S::char_type>>(S()),
|
||
|
|
std::forward<Args>(args)...);
|
||
|
|
} else {
|
||
|
|
return fmt::format_to(out, compiled, std::forward<Args>(args)...);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
template <typename OutputIt, typename S, typename... Args,
|
||
|
|
FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
|
||
|
|
auto format_to_n(OutputIt out, size_t n, const S& format_str, Args&&... args)
|
||
|
|
-> format_to_n_result<OutputIt> {
|
||
|
|
using traits = detail::fixed_buffer_traits;
|
||
|
|
auto buf = detail::iterator_buffer<OutputIt, char, traits>(out, n);
|
||
|
|
fmt::format_to(std::back_inserter(buf), format_str,
|
||
|
|
std::forward<Args>(args)...);
|
||
|
|
return {buf.out(), buf.count()};
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename S, typename... Args,
|
||
|
|
FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
|
||
|
|
FMT_CONSTEXPR20 auto formatted_size(const S& format_str, const Args&... args)
|
||
|
|
-> size_t {
|
||
|
|
return fmt::format_to(detail::counting_iterator(), format_str, args...)
|
||
|
|
.count();
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename S, typename... Args,
|
||
|
|
FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
|
||
|
|
void print(std::FILE* f, const S& format_str, const Args&... args) {
|
||
|
|
memory_buffer buffer;
|
||
|
|
fmt::format_to(std::back_inserter(buffer), format_str, args...);
|
||
|
|
detail::print(f, {buffer.data(), buffer.size()});
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename S, typename... Args,
|
||
|
|
FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
|
||
|
|
void print(const S& format_str, const Args&... args) {
|
||
|
|
print(stdout, format_str, args...);
|
||
|
|
}
|
||
|
|
|
||
|
|
#if FMT_USE_NONTYPE_TEMPLATE_ARGS
|
||
|
|
inline namespace literals {
|
||
|
|
template <detail_exported::fixed_string Str> constexpr auto operator""_cf() {
|
||
|
|
using char_t = remove_cvref_t<decltype(Str.data[0])>;
|
||
|
|
return detail::udl_compiled_string<char_t, sizeof(Str.data) / sizeof(char_t),
|
||
|
|
Str>();
|
||
|
|
}
|
||
|
|
} // namespace literals
|
||
|
|
#endif
|
||
|
|
|
||
|
|
FMT_END_EXPORT
|
||
|
|
FMT_END_NAMESPACE
|
||
|
|
|
||
|
|
#endif // FMT_COMPILE_H_
|