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helper.go
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helper.go
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package carbon
import (
"bytes"
"time"
)
// common formatting symbols
// 常规格式化符号
var formats = map[byte]string{
'd': "02", // Day: Day of the month, 2 digits with leading zeros. Eg: 01 to 31.
'D': "Mon", // Day: A textual representation of a day, three letters. Eg: Mon through Sun.
'j': "2", // Day: Day of the month without leading zeros. Eg: 1 to 31.
'l': "Monday", // Day: A full textual representation of the day of the week. Eg: Sunday through Saturday.
'F': "January", // Month: A full textual representation of a month, such as January or March. Eg: January through December.
'm': "01", // Month: Numeric representation of a month, with leading zeros. Eg: 01 through 12.
'M': "Jan", // Month: A short textual representation of a month, three letters. Eg: Jan through Dec.
'n': "1", // Month: Numeric representation of a month, without leading zeros. Eg: 1 through 12.
'Y': "2006", // Year: A full numeric representation of a year, 4 digits. Eg: 1999 or 2003.
'y': "06", // Year: A two digit representation of a year. Eg: 99 or 03.
'a': "pm", // Time: Lowercase morning or afternoon sign. Eg: am or pm.
'A': "PM", // Time: Uppercase morning or afternoon sign. Eg: AM or PM.
'g': "3", // Time: 12-hour format of an hour without leading zeros. Eg: 1 through 12.
'h': "03", // Time: 12-hour format of an hour with leading zeros. Eg: 01 through 12.
'H': "15", // Time: 24-hour format of an hour with leading zeros. Eg: 00 through 23.
'i': "04", // Time: Minutes with leading zeros. Eg: 00 to 59.
's': "05", // Time: Seconds with leading zeros. Eg: 00 through 59.
'O': "-0700", // Zone: Difference to Greenwich time (GMT) in hours. Eg: +0200.
'P': "-07:00", // Zone: Difference to Greenwich time (GMT) with colon between hours and minutes. Eg: +02:00.
'T': "MST", // Zone: Timezone abbreviation. Eg: UTC, EST, MDT ...
'U': "timestamp", // Timestamp with second. Eg: 1699677240.
'V': "timestampMilli", // TimestampMilli with second. Eg: 1596604455666.
'X': "timestampMicro", // TimestampMicro with second. Eg: 1596604455666666.
'Z': "timestampNano", // TimestampNano with second. Eg: 1596604455666666666.
}
// common layout symbols
// 常规布局模板符号
var layouts = []string{
DayDateTimeLayout,
DateTimeLayout, DateTimeNanoLayout, ShortDateTimeLayout, ShortDateTimeNanoLayout,
DateLayout, DateNanoLayout, ShortDateLayout, ShortDateNanoLayout,
ISO8601Layout, ISO8601NanoLayout,
RFC822Layout, RFC822ZLayout, RFC850Layout, RFC1123Layout, RFC1123ZLayout, RFC3339Layout, RFC3339NanoLayout, RFC1036Layout, RFC7231Layout,
KitchenLayout,
CookieLayout,
ANSICLayout,
UnixDateLayout,
RubyDateLayout,
"2006",
"2006-1", "2006-1-2", "2006-1-2 15", "2006-1-2 15:4", "2006-1-2 15:4:5", "2006-1-2 15:4:5.999999999",
"2006.1", "2006.1.2", "2006.1.2 15", "2006.1.2 15:4", "2006.1.2 15:4:5", "2006.1.2 15:4:5.999999999",
"2006/1", "2006/1/2", "2006/1/2 15", "2006/1/2 15:4", "2006/1/2 15:4:5", "2006/1/2 15:4:5.999999999",
"2006-01-02 15:04:05PM MST", "2006-01-02 15:04:05.999999999PM MST", "2006-1-2 15:4:5PM MST", "2006-1-2 15:4:5.999999999PM MST",
"2006-01-02 15:04:05 PM MST", "2006-01-02 15:04:05.999999999 PM MST", "2006-1-2 15:4:5 PM MST", "2006-1-2 15:4:5.999999999 PM MST",
"1/2/2006", "1/2/2006 15", "1/2/2006 15:4", "1/2/2006 15:4:5", "1/2/2006 15:4:5.999999999",
"2006-1-2 15:4:5 -0700 MST", "2006-1-2 15:4:5.999999999 -0700 MST", "2006-1-2 15:04:05 -0700 MST", "2006-1-2 15:04:05.999999999 -0700 MST",
"2006-01-02T15:04:05", "2006-01-02T15:04:05.999999999", "2006-1-2T3:4:5", "2006-1-2T3:4:5.999999999",
"2006-01-02T15:04:05Z07", "2006-01-02T15:04:05.999999999Z07", "2006-1-2T15:4:5Z07", "2006-1-2T15:4:5.999999999Z07",
"2006-01-02T15:04:05Z07:00", "2006-01-02T15:04:05.999999999Z07:00", "2006-1-2T15:4:5Z07:00", "2006-1-2T15:4:5.999999999Z07:00",
"2006-01-02T15:04:05-07:00", "2006-01-02T15:04:05.999999999-07:00", "2006-1-2T15:4:5-07:00", "2006-1-2T15:4:5.999999999-07:00",
"2006-01-02T15:04:05-0700", "2006-01-02T15:04:05.999999999-0700", "2006-1-2T3:4:5-0700", "2006-1-2T3:4:5.999999999-0700",
"20060102150405-07:00", "20060102150405.999999999-07:00",
"20060102150405Z07", "20060102150405.999999999Z07",
"20060102150405Z07:00", "20060102150405.999999999Z07:00",
}
// converts format to layout.
// format 转 layout
func format2layout(format string) string {
buffer := bytes.NewBuffer(nil)
for i := 0; i < len(format); i++ {
if layout, ok := formats[format[i]]; ok {
buffer.WriteString(layout)
} else {
switch format[i] {
case '\\': // raw output, no parse
buffer.WriteByte(format[i+1])
i++
continue
default:
buffer.WriteByte(format[i])
}
}
}
return buffer.String()
}
// gets a Location instance by a timezone string.
// 通过时区获取 Location 实例
func getLocationByTimezone(timezone string) (*time.Location, error) {
loc, err := time.LoadLocation(timezone)
if err != nil {
err = invalidTimezoneError(timezone)
}
return loc, err
}
// parses as a Duration instance by a duration string.
// 通过时长解析
func parseByDuration(duration string) (time.Duration, error) {
td, err := time.ParseDuration(duration)
if err != nil {
err = invalidDurationError(duration)
}
return td, err
}
// gets absolute value.
// 获取绝对值
func getAbsValue(value int64) int64 {
return (value ^ value>>31) - value>>31
}