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parse.go
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parse.go
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package date
import (
"errors"
"time"
)
var errParse error = errors.New("parse error") // a temporary error for parse
// Parse parses a formatted string with the layout and returns the time value it represents.
func Parse(layout, value string) (Time, error) {
return parse(layout, value, time.Local)
}
// ParseInLocation parses a formatted string with the layout and the given location, and returns
// the time value it represents.
func ParseInLocation(layout, value string, loc *time.Location) (Time, error) {
return parse(layout, value, loc)
}
// ParseInLocationName tries to load the location with the given name, parses a formatted string
// with the layout and the location, and returns the time value it represents.
func ParseInLocationName(layout, value, name string) (Time, error) {
loc, err := time.LoadLocation(name)
if err != nil {
return Time{}, err
}
return parse(layout, value, loc)
}
func parse(layout, value string, loc *time.Location) (Time, error) {
oLayout, oValue := layout, value
am := false
pm := false
var str string
var err error
var (
year int
month int = 1
day int = 1
hour int
min int
sec int
nsec int
tzOffset int = -1
)
for {
token, s, suffix := nextLayoutToken(layout)
if token == layoutTokenEnd {
break
}
layout = suffix
switch token {
case layoutTokenYearLong:
year, value, err = readNum(value, 4, true)
case layoutTokenYear:
year, value, err = readNum(value, 2, true)
if err != nil {
break
}
if year > 69 {
year += 1900
} else {
year += 2000
}
case layoutTokenMonth:
month, value, err = readNum(value, 2, false)
case layoutTokenMonthLong:
month, value, err = readNum(value, 2, true)
case layoutTokenMonthAbbr:
month, value, err = lookup(abbrMonthNames, value)
if err != nil {
break
}
month++
case layoutTokenMonthFull:
month, value, err = lookup(fullMonthNames, value)
if err != nil {
break
}
month++
case layoutTokenDay:
day, value, err = readNum(value, 2, false)
case layoutTokenDayLong:
day, value, err = readNum(value, 2, true)
case layoutTokenHour:
hour, value, err = readNum(value, 2, false)
case layoutTokenHourLong:
hour, value, err = readNum(value, 2, true)
case layoutTokenHour12:
hour, value, err = readNum(value, 2, false)
case layoutTokenHour12Long:
hour, value, err = readNum(value, 2, true)
case layoutTokenMinute:
min, value, err = readNum(value, 2, false)
case layoutTokenMinuteLong:
min, value, err = readNum(value, 2, true)
case layoutTokenSecond:
sec, value, err = readNum(value, 2, false)
case layoutTokenSecondLong:
sec, value, err = readNum(value, 2, true)
case layoutTokenMillisecondHundred:
nsec, value, err = readNum(value, 1, true)
if err != nil {
break
}
nsec *= 100
case layoutTokenMillisecondTen:
nsec, value, err = readNum(value, 2, true)
if err != nil {
break
}
nsec *= 10
case layoutTokenMillisecond:
nsec, value, err = readNum(value, 3, true)
case layoutTokenPMUpper:
if len(value) < 2 {
return Time{}, newParseError(oLayout, oValue, s, value)
}
str, value = value[0:2], value[2:]
switch str {
case "AM":
am = true
case "PM":
pm = true
default:
return Time{}, newParseError(oLayout, oValue, s, str)
}
case layoutTokenPMLower:
if len(value) < 2 {
return Time{}, newParseError(oLayout, oValue, s, value)
}
str, value = value[0:2], value[2:]
switch str {
case "am":
am = true
case "pm":
pm = true
default:
return Time{}, newParseError(oLayout, oValue, s, str)
}
case layoutTokenTZ:
if len(value) < 5 {
return Time{}, newParseError(oLayout, oValue, s, value)
}
var tzHr, tzMm int
tzHr, _, err = readNum(value[1:3], 2, true)
if err == nil {
tzMm, _, err = readNum(value[3:5], 2, true)
}
tzOffset = tzHr*60 + tzMm
switch value[0] {
case '+':
case '-':
tzOffset = -tzOffset
default:
return Time{}, newParseError(oLayout, oValue, s, value[0:5])
}
value = value[5:]
case layoutTokenTZColon:
if len(value) < 6 {
return Time{}, newParseError(oLayout, oValue, s, value)
}
var tzHr, tzMm int
tzHr, _, err = readNum(value[1:3], 2, true)
if err == nil {
tzMm, _, err = readNum(value[4:6], 2, true)
}
tzOffset = tzHr*60 + tzMm
switch value[0] {
case '+':
case '-':
tzOffset = -tzOffset
default:
return Time{}, newParseError(oLayout, oValue, s, value[0:6])
}
value = value[6:]
case layoutTokenNone:
if len(value) < len(s) {
return Time{}, newParseError(oLayout, oValue, s, value)
}
str, value = value[0:len(s)], value[len(s):]
if s != str {
return Time{}, newParseError(oLayout, oValue, s, str)
}
}
if err != nil {
return Time{}, newParseError(oLayout, oValue, s, value)
}
}
if pm && hour < 12 {
hour += 12
} else if am && hour == 12 {
hour = 0
}
nsec *= int(time.Millisecond)
if tzOffset == -1 {
return Date(year, time.Month(month), day, hour, min, sec, nsec, loc), nil
} else {
tm := Date(year, time.Month(month), day, hour, min, sec, nsec, time.UTC)
tm = tm.Add(time.Duration(tzOffset) * time.Minute)
return tm, nil
}
}