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+// Formatting library for C++ - experimental range support
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+//
+// Copyright (c) 2018 - present, Remotion (Igor Schulz)
+// All Rights Reserved
+// {fmt} support for ranges, containers and types tuple interface.
+
+#ifndef FMT_RANGES_H_
+#define FMT_RANGES_H_
+
+#include <initializer_list>
+#include <type_traits>
+
+#include "format.h"
+
+// output only up to N items from the range.
+#ifndef FMT_RANGE_OUTPUT_LENGTH_LIMIT
+# define FMT_RANGE_OUTPUT_LENGTH_LIMIT 256
+#endif
+
+FMT_BEGIN_NAMESPACE
+
+template <typename Char> struct formatting_base {
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return ctx.begin();
+ }
+};
+
+template <typename Char, typename Enable = void>
+struct formatting_range : formatting_base<Char> {
+ static FMT_CONSTEXPR_DECL const size_t range_length_limit =
+ FMT_RANGE_OUTPUT_LENGTH_LIMIT; // output only up to N items from the
+ // range.
+ Char prefix;
+ Char delimiter;
+ Char postfix;
+ formatting_range() : prefix('{'), delimiter(','), postfix('}') {}
+ static FMT_CONSTEXPR_DECL const bool add_delimiter_spaces = true;
+ static FMT_CONSTEXPR_DECL const bool add_prepostfix_space = false;
+};
+
+template <typename Char, typename Enable = void>
+struct formatting_tuple : formatting_base<Char> {
+ Char prefix;
+ Char delimiter;
+ Char postfix;
+ formatting_tuple() : prefix('('), delimiter(','), postfix(')') {}
+ static FMT_CONSTEXPR_DECL const bool add_delimiter_spaces = true;
+ static FMT_CONSTEXPR_DECL const bool add_prepostfix_space = false;
+};
+
+namespace detail {
+
+template <typename RangeT, typename OutputIterator>
+OutputIterator copy(const RangeT& range, OutputIterator out) {
+ for (auto it = range.begin(), end = range.end(); it != end; ++it)
+ *out++ = *it;
+ return out;
+}
+
+template <typename OutputIterator>
+OutputIterator copy(const char* str, OutputIterator out) {
+ while (*str) *out++ = *str++;
+ return out;
+}
+
+template <typename OutputIterator>
+OutputIterator copy(char ch, OutputIterator out) {
+ *out++ = ch;
+ return out;
+}
+
+/// Return true value if T has std::string interface, like std::string_view.
+template <typename T> class is_like_std_string {
+ template <typename U>
+ static auto check(U* p)
+ -> decltype((void)p->find('a'), p->length(), (void)p->data(), int());
+ template <typename> static void check(...);
+
+ public:
+ static FMT_CONSTEXPR_DECL const bool value =
+ is_string<T>::value || !std::is_void<decltype(check<T>(nullptr))>::value;
+};
+
+template <typename Char>
+struct is_like_std_string<fmt::basic_string_view<Char>> : std::true_type {};
+
+template <typename... Ts> struct conditional_helper {};
+
+template <typename T, typename _ = void> struct is_range_ : std::false_type {};
+
+#if !FMT_MSC_VER || FMT_MSC_VER > 1800
+template <typename T>
+struct is_range_<
+ T, conditional_t<false,
+ conditional_helper<decltype(std::declval<T>().begin()),
+ decltype(std::declval<T>().end())>,
+ void>> : std::true_type {};
+#endif
+
+/// tuple_size and tuple_element check.
+template <typename T> class is_tuple_like_ {
+ template <typename U>
+ static auto check(U* p) -> decltype(std::tuple_size<U>::value, int());
+ template <typename> static void check(...);
+
+ public:
+ static FMT_CONSTEXPR_DECL const bool value =
+ !std::is_void<decltype(check<T>(nullptr))>::value;
+};
+
+// Check for integer_sequence
+#if defined(__cpp_lib_integer_sequence) || FMT_MSC_VER >= 1900
+template <typename T, T... N>
+using integer_sequence = std::integer_sequence<T, N...>;
+template <size_t... N> using index_sequence = std::index_sequence<N...>;
+template <size_t N> using make_index_sequence = std::make_index_sequence<N>;
+#else
+template <typename T, T... N> struct integer_sequence {
+ using value_type = T;
+
+ static FMT_CONSTEXPR size_t size() { return sizeof...(N); }
+};
+
+template <size_t... N> using index_sequence = integer_sequence<size_t, N...>;
+
+template <typename T, size_t N, T... Ns>
+struct make_integer_sequence : make_integer_sequence<T, N - 1, N - 1, Ns...> {};
+template <typename T, T... Ns>
+struct make_integer_sequence<T, 0, Ns...> : integer_sequence<T, Ns...> {};
+
+template <size_t N>
+using make_index_sequence = make_integer_sequence<size_t, N>;
+#endif
+
+template <class Tuple, class F, size_t... Is>
+void for_each(index_sequence<Is...>, Tuple&& tup, F&& f) FMT_NOEXCEPT {
+ using std::get;
+ // using free function get<I>(T) now.
+ const int _[] = {0, ((void)f(get<Is>(tup)), 0)...};
+ (void)_; // blocks warnings
+}
+
+template <class T>
+FMT_CONSTEXPR make_index_sequence<std::tuple_size<T>::value> get_indexes(
+ T const&) {
+ return {};
+}
+
+template <class Tuple, class F> void for_each(Tuple&& tup, F&& f) {
+ const auto indexes = get_indexes(tup);
+ for_each(indexes, std::forward<Tuple>(tup), std::forward<F>(f));
+}
+
+template <typename Range>
+using value_type = remove_cvref_t<decltype(*std::declval<Range>().begin())>;
+
+template <typename Arg, FMT_ENABLE_IF(!is_like_std_string<
+ typename std::decay<Arg>::type>::value)>
+FMT_CONSTEXPR const char* format_str_quoted(bool add_space, const Arg&) {
+ return add_space ? " {}" : "{}";
+}
+
+template <typename Arg, FMT_ENABLE_IF(is_like_std_string<
+ typename std::decay<Arg>::type>::value)>
+FMT_CONSTEXPR const char* format_str_quoted(bool add_space, const Arg&) {
+ return add_space ? " \"{}\"" : "\"{}\"";
+}
+
+FMT_CONSTEXPR const char* format_str_quoted(bool add_space, const char*) {
+ return add_space ? " \"{}\"" : "\"{}\"";
+}
+FMT_CONSTEXPR const wchar_t* format_str_quoted(bool add_space, const wchar_t*) {
+ return add_space ? L" \"{}\"" : L"\"{}\"";
+}
+
+FMT_CONSTEXPR const char* format_str_quoted(bool add_space, const char) {
+ return add_space ? " '{}'" : "'{}'";
+}
+FMT_CONSTEXPR const wchar_t* format_str_quoted(bool add_space, const wchar_t) {
+ return add_space ? L" '{}'" : L"'{}'";
+}
+} // namespace detail
+
+template <typename T> struct is_tuple_like {
+ static FMT_CONSTEXPR_DECL const bool value =
+ detail::is_tuple_like_<T>::value && !detail::is_range_<T>::value;
+};
+
+template <typename TupleT, typename Char>
+struct formatter<TupleT, Char, enable_if_t<fmt::is_tuple_like<TupleT>::value>> {
+ private:
+ // C++11 generic lambda for format()
+ template <typename FormatContext> struct format_each {
+ template <typename T> void operator()(const T& v) {
+ if (i > 0) {
+ if (formatting.add_prepostfix_space) {
+ *out++ = ' ';
+ }
+ out = detail::copy(formatting.delimiter, out);
+ }
+ out = format_to(out,
+ detail::format_str_quoted(
+ (formatting.add_delimiter_spaces && i > 0), v),
+ v);
+ ++i;
+ }
+
+ formatting_tuple<Char>& formatting;
+ size_t& i;
+ typename std::add_lvalue_reference<decltype(
+ std::declval<FormatContext>().out())>::type out;
+ };
+
+ public:
+ formatting_tuple<Char> formatting;
+
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return formatting.parse(ctx);
+ }
+
+ template <typename FormatContext = format_context>
+ auto format(const TupleT& values, FormatContext& ctx) -> decltype(ctx.out()) {
+ auto out = ctx.out();
+ size_t i = 0;
+ detail::copy(formatting.prefix, out);
+
+ detail::for_each(values, format_each<FormatContext>{formatting, i, out});
+ if (formatting.add_prepostfix_space) {
+ *out++ = ' ';
+ }
+ detail::copy(formatting.postfix, out);
+
+ return ctx.out();
+ }
+};
+
+template <typename T, typename Char> struct is_range {
+ static FMT_CONSTEXPR_DECL const bool value =
+ detail::is_range_<T>::value && !detail::is_like_std_string<T>::value &&
+ !std::is_convertible<T, std::basic_string<Char>>::value &&
+ !std::is_constructible<detail::std_string_view<Char>, T>::value;
+};
+
+template <typename T, typename Char>
+struct formatter<
+ T, Char,
+ enable_if_t<fmt::is_range<T, Char>::value
+// Workaround a bug in MSVC 2017 and earlier.
+#if !FMT_MSC_VER || FMT_MSC_VER >= 1927
+ &&
+ (has_formatter<detail::value_type<T>, format_context>::value ||
+ detail::has_fallback_formatter<detail::value_type<T>,
+ format_context>::value)
+#endif
+ >> {
+ formatting_range<Char> formatting;
+
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return formatting.parse(ctx);
+ }
+
+ template <typename FormatContext>
+ typename FormatContext::iterator format(const T& values, FormatContext& ctx) {
+ auto out = detail::copy(formatting.prefix, ctx.out());
+ size_t i = 0;
+ auto it = values.begin();
+ auto end = values.end();
+ for (; it != end; ++it) {
+ if (i > 0) {
+ if (formatting.add_prepostfix_space) *out++ = ' ';
+ out = detail::copy(formatting.delimiter, out);
+ }
+ out = format_to(out,
+ detail::format_str_quoted(
+ (formatting.add_delimiter_spaces && i > 0), *it),
+ *it);
+ if (++i > formatting.range_length_limit) {
+ out = format_to(out, " ... <other elements>");
+ break;
+ }
+ }
+ if (formatting.add_prepostfix_space) *out++ = ' ';
+ return detail::copy(formatting.postfix, out);
+ }
+};
+
+template <typename Char, typename... T> struct tuple_arg_join : detail::view {
+ const std::tuple<T...>& tuple;
+ basic_string_view<Char> sep;
+
+ tuple_arg_join(const std::tuple<T...>& t, basic_string_view<Char> s)
+ : tuple{t}, sep{s} {}
+};
+
+template <typename Char, typename... T>
+struct formatter<tuple_arg_join<Char, T...>, Char> {
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return ctx.begin();
+ }
+
+ template <typename FormatContext>
+ typename FormatContext::iterator format(
+ const tuple_arg_join<Char, T...>& value, FormatContext& ctx) {
+ return format(value, ctx, detail::make_index_sequence<sizeof...(T)>{});
+ }
+
+ private:
+ template <typename FormatContext, size_t... N>
+ typename FormatContext::iterator format(
+ const tuple_arg_join<Char, T...>& value, FormatContext& ctx,
+ detail::index_sequence<N...>) {
+ return format_args(value, ctx, std::get<N>(value.tuple)...);
+ }
+
+ template <typename FormatContext>
+ typename FormatContext::iterator format_args(
+ const tuple_arg_join<Char, T...>&, FormatContext& ctx) {
+ // NOTE: for compilers that support C++17, this empty function instantiation
+ // can be replaced with a constexpr branch in the variadic overload.
+ return ctx.out();
+ }
+
+ template <typename FormatContext, typename Arg, typename... Args>
+ typename FormatContext::iterator format_args(
+ const tuple_arg_join<Char, T...>& value, FormatContext& ctx,
+ const Arg& arg, const Args&... args) {
+ using base = formatter<typename std::decay<Arg>::type, Char>;
+ auto out = ctx.out();
+ out = base{}.format(arg, ctx);
+ if (sizeof...(Args) > 0) {
+ out = std::copy(value.sep.begin(), value.sep.end(), out);
+ ctx.advance_to(out);
+ return format_args(value, ctx, args...);
+ }
+ return out;
+ }
+};
+
+/**
+ \rst
+ Returns an object that formats `tuple` with elements separated by `sep`.
+
+ **Example**::
+
+ std::tuple<int, char> t = {1, 'a'};
+ fmt::print("{}", fmt::join(t, ", "));
+ // Output: "1, a"
+ \endrst
+ */
+template <typename... T>
+FMT_CONSTEXPR tuple_arg_join<char, T...> join(const std::tuple<T...>& tuple,
+ string_view sep) {
+ return {tuple, sep};
+}
+
+template <typename... T>
+FMT_CONSTEXPR tuple_arg_join<wchar_t, T...> join(const std::tuple<T...>& tuple,
+ wstring_view sep) {
+ return {tuple, sep};
+}
+
+/**
+ \rst
+ Returns an object that formats `initializer_list` with elements separated by
+ `sep`.
+
+ **Example**::
+
+ fmt::print("{}", fmt::join({1, 2, 3}, ", "));
+ // Output: "1, 2, 3"
+ \endrst
+ */
+template <typename T>
+arg_join<const T*, const T*, char> join(std::initializer_list<T> list,
+ string_view sep) {
+ return join(std::begin(list), std::end(list), sep);
+}
+
+template <typename T>
+arg_join<const T*, const T*, wchar_t> join(std::initializer_list<T> list,
+ wstring_view sep) {
+ return join(std::begin(list), std::end(list), sep);
+}
+
+FMT_END_NAMESPACE
+
+#endif // FMT_RANGES_H_