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81 lines
3.8 KiB
81 lines
3.8 KiB
package carbon
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import (
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"bytes"
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"time"
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)
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// formats common formatting symbols
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// 常规格式化符号
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var formats = map[byte]string{
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'd': "02", // Day: Day of the month, 2 digits with leading zeros. Eg: 01 to 31.
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'D': "Mon", // Day: A textual representation of a day, three letters. Eg: Mon through Sun.
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'j': "2", // Day: Day of the month without leading zeros. Eg: 1 to 31.
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'l': "Monday", // Day: A full textual representation of the day of the week. Eg: Sunday through Saturday.
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'F': "January", // Month: A full textual representation of a month, such as January or March. Eg: January through December.
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'm': "01", // Month: Numeric representation of a month, with leading zeros. Eg: 01 through 12.
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'M': "Jan", // Month: A short textual representation of a month, three letters. Eg: Jan through Dec.
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'n': "1", // Month: Numeric representation of a month, without leading zeros. Eg: 1 through 12.
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'Y': "2006", // Year: A full numeric representation of a year, 4 digits. Eg: 1999 or 2003.
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'y': "06", // Year: A two digit representation of a year. Eg: 99 or 03.
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'a': "pm", // Time: Lowercase morning or afternoon sign. Eg: am or pm.
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'A': "PM", // Time: Uppercase morning or afternoon sign. Eg: AM or PM.
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'g': "3", // Time: 12-hour format of an hour without leading zeros. Eg: 1 through 12.
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'h': "03", // Time: 12-hour format of an hour with leading zeros. Eg: 01 through 12.
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'H': "15", // Time: 24-hour format of an hour with leading zeros. Eg: 00 through 23.
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'i': "04", // Time: Minutes with leading zeros. Eg: 00 to 59.
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's': "05", // Time: Seconds with leading zeros. Eg: 00 through 59.
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'O': "-0700", // Zone: Difference to Greenwich time (GMT) in hours. Eg: +0200.
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'P': "-07:00", // Zone: Difference to Greenwich time (GMT) with colon between hours and minutes. Eg: +02:00.
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'T': "MST", // Zone: Timezone abbreviation. Eg: UTC, EST, MDT ...
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'c': "2006-01-02T15:04:05-07:00", // Format: ISO 8601 date. Eg: 2004-02-12T15:19:21+00:00.
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'r': "Thu, 21 Dec 2000 16:01:07 +0200", // Format: RFC 2822 formatted date. Eg: Thu, 21 Dec 2000 16:01:07 +0200.
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}
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// format2layout converts format to layout.
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// format 转 layout
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func format2layout(format string) string {
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buffer := bytes.NewBuffer(nil)
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for i := 0; i < len(format); i++ {
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if layout, ok := formats[format[i]]; ok {
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buffer.WriteString(layout)
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} else {
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switch format[i] {
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case '\\': // 原样输出，不解析
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buffer.WriteByte(format[i+1])
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i++
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continue
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default:
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buffer.WriteByte(format[i])
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}
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}
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}
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return buffer.String()
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}
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// getLocationByTimezone gets a Location instance by a timezone string.
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// 通过时区获取 Location 实例
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func getLocationByTimezone(timezone string) (*time.Location, error) {
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loc, err := time.LoadLocation(timezone)
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if err != nil {
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err = invalidTimezoneError(timezone)
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}
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return loc, err
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}
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// parseByDuration parses as a Duration instance by a duration string.
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// 通过持续时长解析
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func parseByDuration(duration string) (time.Duration, error) {
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td, err := time.ParseDuration(duration)
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if err != nil {
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err = invalidDurationError(duration)
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}
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return td, err
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}
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// getAbsValue gets absolute value.
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// 获取绝对值
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func getAbsValue(value int64) int64 {
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return (value ^ value>>31) - value>>31
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}
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