452 lines
13 KiB
C++
452 lines
13 KiB
C++
// Formatting library for C++ - chrono support
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//
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// Copyright (c) 2012 - present, Victor Zverovich
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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_CHRONO_H_
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#define FMT_CHRONO_H_
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#include "format.h"
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#include "locale.h"
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#include <chrono>
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#include <ctime>
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#include <locale>
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#include <sstream>
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FMT_BEGIN_NAMESPACE
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namespace internal{
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enum class numeric_system {
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standard,
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// Alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale.
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alternative
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};
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// Parses a put_time-like format string and invokes handler actions.
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template <typename Char, typename Handler>
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FMT_CONSTEXPR const Char *parse_chrono_format(
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const Char *begin, const Char *end, Handler &&handler) {
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auto ptr = begin;
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while (ptr != end) {
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auto c = *ptr;
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if (c == '}') break;
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if (c != '%') {
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++ptr;
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continue;
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}
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if (begin != ptr)
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handler.on_text(begin, ptr);
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++ptr; // consume '%'
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if (ptr == end)
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throw format_error("invalid format");
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c = *ptr++;
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switch (c) {
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case '%':
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handler.on_text(ptr - 1, ptr);
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break;
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case 'n': {
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const char newline[] = "\n";
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handler.on_text(newline, newline + 1);
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break;
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}
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case 't': {
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const char tab[] = "\t";
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handler.on_text(tab, tab + 1);
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break;
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}
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// Day of the week:
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case 'a':
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handler.on_abbr_weekday();
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break;
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case 'A':
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handler.on_full_weekday();
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break;
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case 'w':
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handler.on_dec0_weekday(numeric_system::standard);
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break;
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case 'u':
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handler.on_dec1_weekday(numeric_system::standard);
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break;
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// Month:
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case 'b':
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handler.on_abbr_month();
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break;
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case 'B':
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handler.on_full_month();
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break;
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// Hour, minute, second:
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case 'H':
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handler.on_24_hour(numeric_system::standard);
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break;
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case 'I':
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handler.on_12_hour(numeric_system::standard);
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break;
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case 'M':
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handler.on_minute(numeric_system::standard);
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break;
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case 'S':
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handler.on_second(numeric_system::standard);
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break;
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// Other:
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case 'c':
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handler.on_datetime(numeric_system::standard);
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break;
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case 'x':
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handler.on_loc_date(numeric_system::standard);
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break;
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case 'X':
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handler.on_loc_time(numeric_system::standard);
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break;
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case 'D':
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handler.on_us_date();
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break;
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case 'F':
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handler.on_iso_date();
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break;
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case 'r':
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handler.on_12_hour_time();
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break;
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case 'R':
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handler.on_24_hour_time();
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break;
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case 'T':
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handler.on_iso_time();
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break;
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case 'p':
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handler.on_am_pm();
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break;
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case 'z':
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handler.on_utc_offset();
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break;
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case 'Z':
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handler.on_tz_name();
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break;
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// Alternative representation:
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case 'E': {
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if (ptr == end)
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throw format_error("invalid format");
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c = *ptr++;
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switch (c) {
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case 'c':
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handler.on_datetime(numeric_system::alternative);
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break;
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case 'x':
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handler.on_loc_date(numeric_system::alternative);
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break;
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case 'X':
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handler.on_loc_time(numeric_system::alternative);
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break;
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default:
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throw format_error("invalid format");
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}
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break;
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}
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case 'O':
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if (ptr == end)
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throw format_error("invalid format");
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c = *ptr++;
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switch (c) {
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case 'w':
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handler.on_dec0_weekday(numeric_system::alternative);
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break;
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case 'u':
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handler.on_dec1_weekday(numeric_system::alternative);
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break;
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case 'H':
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handler.on_24_hour(numeric_system::alternative);
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break;
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case 'I':
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handler.on_12_hour(numeric_system::alternative);
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break;
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case 'M':
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handler.on_minute(numeric_system::alternative);
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break;
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case 'S':
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handler.on_second(numeric_system::alternative);
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break;
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default:
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throw format_error("invalid format");
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}
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break;
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default:
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throw format_error("invalid format");
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}
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begin = ptr;
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}
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if (begin != ptr)
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handler.on_text(begin, ptr);
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return ptr;
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}
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struct chrono_format_checker {
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void report_no_date() { throw format_error("no date"); }
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template <typename Char>
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void on_text(const Char *, const Char *) {}
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void on_abbr_weekday() { report_no_date(); }
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void on_full_weekday() { report_no_date(); }
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void on_dec0_weekday(numeric_system) { report_no_date(); }
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void on_dec1_weekday(numeric_system) { report_no_date(); }
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void on_abbr_month() { report_no_date(); }
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void on_full_month() { report_no_date(); }
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void on_24_hour(numeric_system) {}
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void on_12_hour(numeric_system) {}
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void on_minute(numeric_system) {}
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void on_second(numeric_system) {}
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void on_datetime(numeric_system) { report_no_date(); }
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void on_loc_date(numeric_system) { report_no_date(); }
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void on_loc_time(numeric_system) { report_no_date(); }
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void on_us_date() { report_no_date(); }
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void on_iso_date() { report_no_date(); }
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void on_12_hour_time() {}
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void on_24_hour_time() {}
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void on_iso_time() {}
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void on_am_pm() {}
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void on_utc_offset() { report_no_date(); }
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void on_tz_name() { report_no_date(); }
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};
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template <typename Int>
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inline int to_int(Int value) {
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FMT_ASSERT(value >= (std::numeric_limits<int>::min)() &&
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value <= (std::numeric_limits<int>::max)(), "invalid value");
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return static_cast<int>(value);
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}
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template <typename FormatContext, typename OutputIt>
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struct chrono_formatter {
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FormatContext &context;
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OutputIt out;
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std::chrono::seconds s;
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std::chrono::milliseconds ms;
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typedef typename FormatContext::char_type char_type;
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explicit chrono_formatter(FormatContext &ctx, OutputIt o)
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: context(ctx), out(o) {}
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int hour() const { return to_int((s.count() / 3600) % 24); }
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int hour12() const {
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auto hour = to_int((s.count() / 3600) % 12);
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return hour > 0 ? hour : 12;
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}
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int minute() const { return to_int((s.count() / 60) % 60); }
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int second() const { return to_int(s.count() % 60); }
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std::tm time() const {
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auto time = std::tm();
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time.tm_hour = hour();
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time.tm_min = minute();
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time.tm_sec = second();
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return time;
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}
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void write(int value, int width) {
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typedef typename int_traits<int>::main_type main_type;
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main_type n = to_unsigned(value);
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int num_digits = internal::count_digits(n);
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if (width > num_digits)
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out = std::fill_n(out, width - num_digits, '0');
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out = format_decimal<char_type>(out, n, num_digits);
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}
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void format_localized(const tm &time, const char *format) {
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auto locale = context.locale().template get<std::locale>();
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auto &facet = std::use_facet<std::time_put<char_type>>(locale);
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std::basic_ostringstream<char_type> os;
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os.imbue(locale);
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facet.put(os, os, ' ', &time, format, format + std::strlen(format));
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auto str = os.str();
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std::copy(str.begin(), str.end(), out);
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}
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void on_text(const char_type *begin, const char_type *end) {
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std::copy(begin, end, out);
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}
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// These are not implemented because durations don't have date information.
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void on_abbr_weekday() {}
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void on_full_weekday() {}
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void on_dec0_weekday(numeric_system) {}
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void on_dec1_weekday(numeric_system) {}
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void on_abbr_month() {}
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void on_full_month() {}
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void on_datetime(numeric_system) {}
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void on_loc_date(numeric_system) {}
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void on_loc_time(numeric_system) {}
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void on_us_date() {}
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void on_iso_date() {}
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void on_utc_offset() {}
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void on_tz_name() {}
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void on_24_hour(numeric_system ns) {
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if (ns == numeric_system::standard)
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return write(hour(), 2);
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auto time = tm();
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time.tm_hour = hour();
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format_localized(time, "%OH");
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}
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void on_12_hour(numeric_system ns) {
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if (ns == numeric_system::standard)
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return write(hour12(), 2);
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auto time = tm();
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time.tm_hour = hour();
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format_localized(time, "%OI");
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}
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void on_minute(numeric_system ns) {
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if (ns == numeric_system::standard)
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return write(minute(), 2);
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auto time = tm();
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time.tm_min = minute();
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format_localized(time, "%OM");
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}
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void on_second(numeric_system ns) {
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if (ns == numeric_system::standard) {
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write(second(), 2);
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if (ms != std::chrono::milliseconds(0)) {
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*out++ = '.';
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write(to_int(ms.count()), 3);
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}
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return;
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}
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auto time = tm();
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time.tm_sec = second();
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format_localized(time, "%OS");
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}
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void on_12_hour_time() { format_localized(time(), "%r"); }
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void on_24_hour_time() {
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write(hour(), 2);
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*out++ = ':';
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write(minute(), 2);
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}
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void on_iso_time() {
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on_24_hour_time();
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*out++ = ':';
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write(second(), 2);
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}
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void on_am_pm() { format_localized(time(), "%p"); }
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};
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} // namespace internal
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template <typename Period> FMT_CONSTEXPR const char *get_units() {
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return FMT_NULL;
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}
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template <> FMT_CONSTEXPR const char *get_units<std::atto>() { return "as"; }
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template <> FMT_CONSTEXPR const char *get_units<std::femto>() { return "fs"; }
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template <> FMT_CONSTEXPR const char *get_units<std::pico>() { return "ps"; }
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template <> FMT_CONSTEXPR const char *get_units<std::nano>() { return "ns"; }
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template <> FMT_CONSTEXPR const char *get_units<std::micro>() { return "µs"; }
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template <> FMT_CONSTEXPR const char *get_units<std::milli>() { return "ms"; }
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template <> FMT_CONSTEXPR const char *get_units<std::centi>() { return "cs"; }
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template <> FMT_CONSTEXPR const char *get_units<std::deci>() { return "ds"; }
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template <> FMT_CONSTEXPR const char *get_units<std::ratio<1>>() { return "s"; }
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template <> FMT_CONSTEXPR const char *get_units<std::deca>() { return "das"; }
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template <> FMT_CONSTEXPR const char *get_units<std::hecto>() { return "hs"; }
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template <> FMT_CONSTEXPR const char *get_units<std::kilo>() { return "ks"; }
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template <> FMT_CONSTEXPR const char *get_units<std::mega>() { return "Ms"; }
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template <> FMT_CONSTEXPR const char *get_units<std::giga>() { return "Gs"; }
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template <> FMT_CONSTEXPR const char *get_units<std::tera>() { return "Ts"; }
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template <> FMT_CONSTEXPR const char *get_units<std::peta>() { return "Ps"; }
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template <> FMT_CONSTEXPR const char *get_units<std::exa>() { return "Es"; }
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template <> FMT_CONSTEXPR const char *get_units<std::ratio<60>>() {
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return "m";
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}
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template <> FMT_CONSTEXPR const char *get_units<std::ratio<3600>>() {
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return "h";
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}
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template <typename Rep, typename Period, typename Char>
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struct formatter<std::chrono::duration<Rep, Period>, Char> {
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private:
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align_spec spec;
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internal::arg_ref<Char> width_ref;
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mutable basic_string_view<Char> format_str;
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typedef std::chrono::duration<Rep, Period> duration;
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struct spec_handler {
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formatter &f;
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basic_parse_context<Char> &context;
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typedef internal::arg_ref<Char> arg_ref_type;
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template <typename Id>
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FMT_CONSTEXPR arg_ref_type make_arg_ref(Id arg_id) {
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context.check_arg_id(arg_id);
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return arg_ref_type(arg_id);
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}
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FMT_CONSTEXPR arg_ref_type make_arg_ref(internal::auto_id) {
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return arg_ref_type(context.next_arg_id());
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}
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void on_error(const char *msg) { throw format_error(msg); }
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void on_fill(Char fill) { f.spec.fill_ = fill; }
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void on_align(alignment align) { f.spec.align_ = align; }
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void on_width(unsigned width) { f.spec.width_ = width; }
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template <typename Id>
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void on_dynamic_width(Id arg_id) {
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f.width_ref = make_arg_ref(arg_id);
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}
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};
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public:
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formatter() : spec() {}
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FMT_CONSTEXPR auto parse(basic_parse_context<Char> &ctx)
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-> decltype(ctx.begin()) {
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auto begin = ctx.begin(), end = ctx.end();
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if (begin == end) return begin;
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spec_handler handler{*this, ctx};
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begin = internal::parse_align(begin, end, handler);
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if (begin == end) return begin;
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begin = internal::parse_width(begin, end, handler);
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end = parse_chrono_format(begin, end, internal::chrono_format_checker());
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format_str = basic_string_view<Char>(&*begin, internal::to_unsigned(end - begin));
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return end;
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}
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template <typename FormatContext>
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auto format(const duration &d, FormatContext &ctx)
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-> decltype(ctx.out()) {
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auto begin = format_str.begin(), end = format_str.end();
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memory_buffer buf;
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typedef output_range<decltype(ctx.out()), Char> range;
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basic_writer<range> w(range(ctx.out()));
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if (begin == end || *begin == '}') {
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if (const char *unit = get_units<Period>())
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format_to(buf, "{}{}", d.count(), unit);
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else if (Period::den == 1)
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format_to(buf, "{}[{}]s", d.count(), Period::num);
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else
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format_to(buf, "{}[{}/{}]s", d.count(), Period::num, Period::den);
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internal::handle_dynamic_spec<internal::width_checker>(
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spec.width_, width_ref, ctx);
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} else {
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auto out = std::back_inserter(buf);
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internal::chrono_formatter<FormatContext, decltype(out)> f(ctx, out);
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f.s = std::chrono::duration_cast<std::chrono::seconds>(d);
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f.ms = std::chrono::duration_cast<std::chrono::milliseconds>(d - f.s);
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parse_chrono_format(begin, end, f);
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}
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w.write(buf.data(), buf.size(), spec);
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return w.out();
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}
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};
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FMT_END_NAMESPACE
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#endif // FMT_CHRONO_H_
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