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formatter.go
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formatter.go
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package yymmdd
import (
"errors"
"fmt"
"time"
)
func Format(time time.Time, layout string) string {
_, tokens := lexLayout(layout)
ds := parse(tokens)
return ds.Format(time)
}
var errInvalidTimeFormat = errors.New("invalid time format")
type formatter struct {
Items []ItemFormatter
}
func (f *formatter) Format(t time.Time) string {
var gf string
for _, i := range f.Items {
itemFormatString, _ := i.translateToGolangFormat()
gf += itemFormatString
}
return t.Format(gf)
}
func (f *formatter) Parse(str string) (time.Time, error) {
var gf string
for _, i := range f.Items {
itemFormatString, _ := i.translateToGolangFormat()
gf += itemFormatString
}
return time.Parse(gf, str)
}
type ItemFormatter interface {
translateToGolangFormat() (string, error)
setOriginal(string)
}
type basicFormatter struct {
origin string
}
func (self *basicFormatter) translateToGolangFormat() (string, error) {
return self.origin, nil
}
func (self *basicFormatter) setOriginal(o string) {
self.origin = o
}
func (self *basicFormatter) String() string {
return fmt.Sprintf("basic formatter as (%s)", self.origin)
}
type YearFormatter struct {
basicFormatter
}
func (y *YearFormatter) translateToGolangFormat() (string, error) {
switch len(y.origin) {
case 4:
return "2006", nil
case 2:
return "06", nil
default:
return "", errInvalidTimeFormat
}
}
func (y *YearFormatter) String() string {
return fmt.Sprintf("year formatter as (%s)", y.origin)
}
type MonthFormatter struct {
basicFormatter
}
func (self *MonthFormatter) translateToGolangFormat() (string, error) {
switch len(self.origin) {
case 3:
return "Jan", nil
case 2:
return "01", nil
case 1:
return "1", nil
default:
return "", errInvalidTimeFormat
}
}
func (self *MonthFormatter) String() string {
return fmt.Sprintf("month formatter as (%s)", self.origin)
}
type DayFormatter struct {
basicFormatter
}
func (self *DayFormatter) translateToGolangFormat() (string, error) {
switch len(self.origin) {
case 2:
return "02", nil
case 1:
return "2", nil
default:
return "", errInvalidTimeFormat
}
}
func (self *DayFormatter) String() string {
return fmt.Sprintf("day formatter as (%s)", self.origin)
}
type HourFormatter struct {
basicFormatter
}
func (self *HourFormatter) translateToGolangFormat() (string, error) {
switch len(self.origin) {
case 2:
return "15", nil
case 1:
return "15", nil
default:
return "", errInvalidTimeFormat
}
}
func (self *HourFormatter) String() string {
return fmt.Sprintf("hour formatter as (%s)", self.origin)
}
type MinuteFormatter struct {
basicFormatter
}
func (self *MinuteFormatter) translateToGolangFormat() (string, error) {
switch len(self.origin) {
case 2:
return "04", nil
case 1:
return "4", nil
default:
return "", errInvalidTimeFormat
}
}
func (self *MinuteFormatter) String() string {
return fmt.Sprintf("minute formatter as (%s)", self.origin)
}
type SecondFormatter struct {
basicFormatter
}
func (self *SecondFormatter) translateToGolangFormat() (string, error) {
switch len(self.origin) {
case 2:
return "05", nil
case 1:
return "5", nil
default:
return "", errInvalidTimeFormat
}
}
func (self *SecondFormatter) String() string {
return fmt.Sprintf("second formatter as (%s)", self.origin)
}