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-rw-r--r--include/spdlog/details/fmt_helper.h116
1 files changed, 116 insertions, 0 deletions
diff --git a/include/spdlog/details/fmt_helper.h b/include/spdlog/details/fmt_helper.h
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+++ b/include/spdlog/details/fmt_helper.h
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+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+#pragma once
+
+#include <chrono>
+#include <type_traits>
+#include <spdlog/fmt/fmt.h>
+#include <spdlog/common.h>
+
+// Some fmt helpers to efficiently format and pad ints and strings
+namespace spdlog {
+namespace details {
+namespace fmt_helper {
+
+inline spdlog::string_view_t to_string_view(const memory_buf_t &buf) SPDLOG_NOEXCEPT
+{
+ return spdlog::string_view_t{buf.data(), buf.size()};
+}
+
+inline void append_string_view(spdlog::string_view_t view, memory_buf_t &dest)
+{
+ auto *buf_ptr = view.data();
+ dest.append(buf_ptr, buf_ptr + view.size());
+}
+
+template<typename T>
+inline void append_int(T n, memory_buf_t &dest)
+{
+ fmt::format_int i(n);
+ dest.append(i.data(), i.data() + i.size());
+}
+
+template<typename T>
+inline unsigned int count_digits(T n)
+{
+ using count_type = typename std::conditional<(sizeof(T) > sizeof(uint32_t)), uint64_t, uint32_t>::type;
+ return static_cast<unsigned int>(fmt::
+// fmt 7.0.0 renamed the internal namespace to detail.
+// See: https://github.com/fmtlib/fmt/issues/1538
+#if FMT_VERSION < 70000
+ internal
+#else
+ detail
+#endif
+ ::count_digits(static_cast<count_type>(n)));
+}
+
+inline void pad2(int n, memory_buf_t &dest)
+{
+ if (n >= 0 && n < 100) // 0-99
+ {
+ dest.push_back(static_cast<char>('0' + n / 10));
+ dest.push_back(static_cast<char>('0' + n % 10));
+ }
+ else // unlikely, but just in case, let fmt deal with it
+ {
+ fmt::format_to(dest, "{:02}", n);
+ }
+}
+
+template<typename T>
+inline void pad_uint(T n, unsigned int width, memory_buf_t &dest)
+{
+ static_assert(std::is_unsigned<T>::value, "pad_uint must get unsigned T");
+ for (auto digits = count_digits(n); digits < width; digits++)
+ {
+ dest.push_back('0');
+ }
+ append_int(n, dest);
+}
+
+template<typename T>
+inline void pad3(T n, memory_buf_t &dest)
+{
+ static_assert(std::is_unsigned<T>::value, "pad3 must get unsigned T");
+ if (n < 1000)
+ {
+ dest.push_back(static_cast<char>(n / 100 + '0'));
+ n = n % 100;
+ dest.push_back(static_cast<char>((n / 10) + '0'));
+ dest.push_back(static_cast<char>((n % 10) + '0'));
+ }
+ else
+ {
+ append_int(n, dest);
+ }
+}
+
+template<typename T>
+inline void pad6(T n, memory_buf_t &dest)
+{
+ pad_uint(n, 6, dest);
+}
+
+template<typename T>
+inline void pad9(T n, memory_buf_t &dest)
+{
+ pad_uint(n, 9, dest);
+}
+
+// return fraction of a second of the given time_point.
+// e.g.
+// fraction<std::milliseconds>(tp) -> will return the millis part of the second
+template<typename ToDuration>
+inline ToDuration time_fraction(log_clock::time_point tp)
+{
+ using std::chrono::duration_cast;
+ using std::chrono::seconds;
+ auto duration = tp.time_since_epoch();
+ auto secs = duration_cast<seconds>(duration);
+ return duration_cast<ToDuration>(duration) - duration_cast<ToDuration>(secs);
+}
+
+} // namespace fmt_helper
+} // namespace details
+} // namespace spdlog