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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 17:44:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 17:44:55 +0000
commit5068d34c08f951a7ea6257d305a1627b09a95817 (patch)
tree08213e2be853396a3b07ce15dbe222644dcd9a89 /src/fmtlib/fmt/ostream.h
parentInitial commit. (diff)
downloadlnav-upstream.tar.xz
lnav-upstream.zip
Adding upstream version 0.11.1.upstream/0.11.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--src/fmtlib/fmt/ostream.h213
1 files changed, 213 insertions, 0 deletions
diff --git a/src/fmtlib/fmt/ostream.h b/src/fmtlib/fmt/ostream.h
new file mode 100644
index 0000000..394d947
--- /dev/null
+++ b/src/fmtlib/fmt/ostream.h
@@ -0,0 +1,213 @@
+// Formatting library for C++ - std::ostream support
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_OSTREAM_H_
+#define FMT_OSTREAM_H_
+
+#include <fstream>
+#include <ostream>
+
+#include "format.h"
+
+FMT_BEGIN_NAMESPACE
+
+template <typename OutputIt, typename Char> class basic_printf_context;
+
+namespace detail {
+
+// Checks if T has a user-defined operator<<.
+template <typename T, typename Char, typename Enable = void>
+class is_streamable {
+ private:
+ template <typename U>
+ static auto test(int)
+ -> bool_constant<sizeof(std::declval<std::basic_ostream<Char>&>()
+ << std::declval<U>()) != 0>;
+
+ template <typename> static auto test(...) -> std::false_type;
+
+ using result = decltype(test<T>(0));
+
+ public:
+ is_streamable() = default;
+
+ static const bool value = result::value;
+};
+
+// Formatting of built-in types and arrays is intentionally disabled because
+// it's handled by standard (non-ostream) formatters.
+template <typename T, typename Char>
+struct is_streamable<
+ T, Char,
+ enable_if_t<
+ std::is_arithmetic<T>::value || std::is_array<T>::value ||
+ std::is_pointer<T>::value || std::is_same<T, char8_type>::value ||
+ std::is_convertible<T, fmt::basic_string_view<Char>>::value ||
+ std::is_same<T, std_string_view<Char>>::value ||
+ (std::is_convertible<T, int>::value && !std::is_enum<T>::value)>>
+ : std::false_type {};
+
+template <typename Char> FILE* get_file(std::basic_filebuf<Char>&) {
+ return nullptr;
+}
+
+struct dummy_filebuf {
+ FILE* _Myfile;
+};
+template <typename T, typename U = int> struct ms_filebuf {
+ using type = dummy_filebuf;
+};
+template <typename T> struct ms_filebuf<T, decltype(T::_Myfile, 0)> {
+ using type = T;
+};
+using filebuf_type = ms_filebuf<std::filebuf>::type;
+
+FILE* get_file(filebuf_type& buf);
+
+// Generate a unique explicit instantion in every translation unit using a tag
+// type in an anonymous namespace.
+namespace {
+struct filebuf_access_tag {};
+} // namespace
+template <typename Tag, typename FileMemberPtr, FileMemberPtr file>
+class filebuf_access {
+ friend FILE* get_file(filebuf_type& buf) { return buf.*file; }
+};
+template class filebuf_access<filebuf_access_tag,
+ decltype(&filebuf_type::_Myfile),
+ &filebuf_type::_Myfile>;
+
+inline bool write(std::filebuf& buf, fmt::string_view data) {
+ FILE* f = get_file(buf);
+ if (!f) return false;
+ print(f, data);
+ return true;
+}
+inline bool write(std::wfilebuf&, fmt::basic_string_view<wchar_t>) {
+ return false;
+}
+
+// Write the content of buf to os.
+// It is a separate function rather than a part of vprint to simplify testing.
+template <typename Char>
+void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
+ if (const_check(FMT_MSC_VERSION)) {
+ auto filebuf = dynamic_cast<std::basic_filebuf<Char>*>(os.rdbuf());
+ if (filebuf && write(*filebuf, {buf.data(), buf.size()})) return;
+ }
+ const Char* buf_data = buf.data();
+ using unsigned_streamsize = std::make_unsigned<std::streamsize>::type;
+ unsigned_streamsize size = buf.size();
+ unsigned_streamsize max_size = to_unsigned(max_value<std::streamsize>());
+ do {
+ unsigned_streamsize n = size <= max_size ? size : max_size;
+ os.write(buf_data, static_cast<std::streamsize>(n));
+ buf_data += n;
+ size -= n;
+ } while (size != 0);
+}
+
+template <typename Char, typename T>
+void format_value(buffer<Char>& buf, const T& value,
+ locale_ref loc = locale_ref()) {
+ auto&& format_buf = formatbuf<std::basic_streambuf<Char>>(buf);
+ auto&& output = std::basic_ostream<Char>(&format_buf);
+#if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
+ if (loc) output.imbue(loc.get<std::locale>());
+#endif
+ output << value;
+ output.exceptions(std::ios_base::failbit | std::ios_base::badbit);
+}
+
+template <typename T> struct streamed_view { const T& value; };
+
+} // namespace detail
+
+// Formats an object of type T that has an overloaded ostream operator<<.
+template <typename Char>
+struct basic_ostream_formatter : formatter<basic_string_view<Char>, Char> {
+ template <typename T, typename OutputIt>
+ auto format(const T& value, basic_format_context<OutputIt, Char>& ctx) const
+ -> OutputIt {
+ auto buffer = basic_memory_buffer<Char>();
+ format_value(buffer, value, ctx.locale());
+ return formatter<basic_string_view<Char>, Char>::format(
+ {buffer.data(), buffer.size()}, ctx);
+ }
+};
+
+using ostream_formatter = basic_ostream_formatter<char>;
+
+template <typename T>
+struct formatter<detail::streamed_view<T>> : ostream_formatter {
+ template <typename OutputIt>
+ auto format(detail::streamed_view<T> view,
+ basic_format_context<OutputIt, char>& ctx) const -> OutputIt {
+ return ostream_formatter::format(view.value, ctx);
+ }
+};
+
+/**
+ \rst
+ Returns a view that formats `value` via an ostream ``operator<<``.
+
+ **Example**::
+
+ fmt::print("Current thread id: {}\n",
+ fmt::streamed(std::this_thread::get_id()));
+ \endrst
+ */
+template <typename T>
+auto streamed(const T& value) -> detail::streamed_view<T> {
+ return {value};
+}
+
+namespace detail {
+
+// Formats an object of type T that has an overloaded ostream operator<<.
+template <typename T, typename Char>
+struct fallback_formatter<T, Char, enable_if_t<is_streamable<T, Char>::value>>
+ : basic_ostream_formatter<Char> {
+ using basic_ostream_formatter<Char>::format;
+};
+
+} // namespace detail
+
+FMT_MODULE_EXPORT template <typename Char>
+void vprint(std::basic_ostream<Char>& os,
+ basic_string_view<type_identity_t<Char>> format_str,
+ basic_format_args<buffer_context<type_identity_t<Char>>> args) {
+ auto buffer = basic_memory_buffer<Char>();
+ detail::vformat_to(buffer, format_str, args);
+ detail::write_buffer(os, buffer);
+}
+
+/**
+ \rst
+ Prints formatted data to the stream *os*.
+
+ **Example**::
+
+ fmt::print(cerr, "Don't {}!", "panic");
+ \endrst
+ */
+FMT_MODULE_EXPORT template <typename... T>
+void print(std::ostream& os, format_string<T...> fmt, T&&... args) {
+ vprint(os, fmt, fmt::make_format_args(args...));
+}
+
+FMT_MODULE_EXPORT
+template <typename... Args>
+void print(std::wostream& os,
+ basic_format_string<wchar_t, type_identity_t<Args>...> fmt,
+ Args&&... args) {
+ vprint(os, fmt, fmt::make_format_args<buffer_context<wchar_t>>(args...));
+}
+
+FMT_END_NAMESPACE
+
+#endif // FMT_OSTREAM_H_