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issue_108
dateparse/parseany.go
Aaron Raddon 89f84f141b work on #108, most likely wnf, this is incomplete
2020-10-01 11:13:56 -07:00

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// Package dateparse parses date-strings without knowing the format
// in advance, using a fast lex based approach to eliminate shotgun
// attempts. It leans towards US style dates when there is a conflict.
package dateparse
import (
"fmt"
"strconv"
"strings"
"time"
"unicode"
"unicode/utf8"
"github.com/araddon/gou"
)
func init() {
gou.SetupLogging("debug")
gou.SetColorOutput()
}
var days = []string{
"mon",
"tue",
"wed",
"thu",
"fri",
"sat",
"sun",
"monday",
"tuesday",
"wednesday",
"thursday",
"friday",
"saturday",
"sunday",
}
var months = []string{
"january",
"february",
"march",
"april",
"may",
"june",
"july",
"august",
"september",
"october",
"november",
"december",
}
type dateState uint8
type timeState uint8
const (
dateStart dateState = iota // 0
dateDigit
dateYearDash
dateYearDashAlphaDash
dateYearDashDash
dateYearDashDashWs // 5
dateYearDashDashT
dateDigitDash
dateDigitDashAlpha
dateDigitDashAlphaDash
dateDigitDot // 10
dateDigitDotDot
dateDigitSlash
dateDigitColon
dateDigitChineseYear
dateDigitChineseYearWs // 15
dateDigitWs
dateDigitWsMoYear
dateDigitWsMolong
dateAlpha
dateAlphaWs // 20
dateAlphaWsDigit
dateAlphaWsDigitMore
dateAlphaWsDigitMoreWs
dateAlphaWsDigitMoreWsYear
dateAlphaWsMonth // 25
dateAlphaWsDigitYearmaybe
dateAlphaWsMonthMore
dateAlphaWsMonthSuffix
dateAlphaWsMore
dateAlphaWsAtTime // 30
dateAlphaWsAlpha
dateAlphaWsAlphaYearmaybe
dateAlphaPeriodWsDigit
dateWeekdayComma
dateWeekdayAbbrevComma
)
const (
// Time state
timeIgnore timeState = iota // 0
timeStart
timeWs
timeWsAlpha
timeWsAlphaWs
timeWsAlphaZoneOffset // 5
timeWsAlphaZoneOffsetWs
timeWsAlphaZoneOffsetWsYear
timeWsAlphaZoneOffsetWsExtra
timeWsAMPMMaybe
timeWsAMPM // 10
timeWsOffset
timeWsOffsetWs // 12
timeWsOffsetColonAlpha
timeWsOffsetColon
timeWsYear // 15
timeOffset
timeOffsetColon
timeAlpha
timePeriod
timePeriodOffset // 20
timePeriodOffsetColon
timePeriodOffsetColonWs
timePeriodWs
timePeriodWsAlpha
timePeriodWsOffset // 25
timePeriodWsOffsetWs
timePeriodWsOffsetWsAlpha
timePeriodWsOffsetColon
timePeriodWsOffsetColonAlpha
timeZ
timeZDigit
)
var (
// ErrAmbiguousMMDD for date formats such as 04/02/2014 the mm/dd vs dd/mm are
// ambiguous, so it is an error for strict parse rules.
ErrAmbiguousMMDD = fmt.Errorf("This date has ambiguous mm/dd vs dd/mm type format")
)
func unknownErr(datestr string) error {
return fmt.Errorf("Could not find format for %q", datestr)
}
// ParseAny parse an unknown date format, detect the layout.
// Normal parse. Equivalent Timezone rules as time.Parse().
// NOTE: please see readme on mmdd vs ddmm ambiguous dates.
func ParseAny(datestr string, opts ...ParserOption) (time.Time, error) {
p, err := parseTime(datestr, nil, opts...)
if err != nil {
return time.Time{}, err
}
return p.parse()
}
// ParseIn with Location, equivalent to time.ParseInLocation() timezone/offset
// rules. Using location arg, if timezone/offset info exists in the
// datestring, it uses the given location rules for any zone interpretation.
// That is, MST means one thing when using America/Denver and something else
// in other locations.
func ParseIn(datestr string, loc *time.Location, opts ...ParserOption) (time.Time, error) {
p, err := parseTime(datestr, loc, opts...)
if err != nil {
return time.Time{}, err
}
return p.parse()
}
// ParseLocal Given an unknown date format, detect the layout,
// using time.Local, parse.
//
// Set Location to time.Local. Same as ParseIn Location but lazily uses
// the global time.Local variable for Location argument.
//
// denverLoc, _ := time.LoadLocation("America/Denver")
// time.Local = denverLoc
//
// t, err := dateparse.ParseLocal("3/1/2014")
//
// Equivalent to:
//
// t, err := dateparse.ParseIn("3/1/2014", denverLoc)
//
func ParseLocal(datestr string, opts ...ParserOption) (time.Time, error) {
p, err := parseTime(datestr, time.Local, opts...)
if err != nil {
return time.Time{}, err
}
return p.parse()
}
// MustParse parse a date, and panic if it can't be parsed. Used for testing.
// Not recommended for most use-cases.
func MustParse(datestr string, opts ...ParserOption) time.Time {
p, err := parseTime(datestr, nil, opts...)
if err != nil {
panic(err.Error())
}
t, err := p.parse()
if err != nil {
panic(err.Error())
}
return t
}
// ParseFormat parse's an unknown date-time string and returns a layout
// string that can parse this (and exact same format) other date-time strings.
//
// layout, err := dateparse.ParseFormat("2013-02-01 00:00:00")
// // layout = "2006-01-02 15:04:05"
//
func ParseFormat(datestr string, opts ...ParserOption) (string, error) {
return parseFormatOptions(datestr, nil, opts...)
}
func parseFormatOptions(datestr string, loc *time.Location, opts ...ParserOption) (string, error) {
p, err := parseTime(datestr, loc, opts...)
if err != nil {
return "", err
}
t, err := p.parse()
gou.Debugf("%s returned %v IsZero()=%v nano=%v second=%v error %v", datestr, t, t.IsZero(), t.UnixNano(), t.Unix(), err)
if err != nil {
return "", err
}
// Because the above parse essentially punts by sending to underlying
// go time.Parse() which can easily return a 0000-01-01 00:00:00 +0000 UTC
// we count that as an error.
//
// However, this is definitely not failproof.
if t.IsZero() {
return "", fmt.Errorf("%s returned a IsZero() time so must be invalid", datestr)
}
return string(p.format), nil
}
// ParseStrict parse an unknown date format. IF the date is ambigous
// mm/dd vs dd/mm then return an error. These return errors: 3.3.2014 , 8/8/71 etc
func ParseStrict(datestr string, opts ...ParserOption) (time.Time, error) {
p, err := parseTime(datestr, nil, opts...)
if err != nil {
return time.Time{}, err
}
if p.ambiguousMD {
return time.Time{}, ErrAmbiguousMMDD
}
return p.parse()
}
func parseTime(datestr string, loc *time.Location, opts ...ParserOption) (p *parser, err error) {
p = newParser(datestr, loc, opts...)
if p.retryAmbiguousDateWithSwap {
// month out of range signifies that a day/month swap is the correct solution to an ambiguous date
// this is because it means that a day is being interpreted as a month and overflowing the valid value for that
// by retrying in this case, we can fix a common situation with no assumptions
defer func() {
if p.ambiguousMD {
// if it errors out with the following error, swap before we
// get out of this function to reduce scope it needs to be applied on
_, err := p.parse()
if err != nil && strings.Contains(err.Error(), "month out of range") {
// create the option to reverse the preference
preferMonthFirst := PreferMonthFirst(!p.preferMonthFirst)
// turn off the retry to avoid endless recursion
retryAmbiguousDateWithSwap := RetryAmbiguousDateWithSwap(false)
modifiedOpts := append(opts, preferMonthFirst, retryAmbiguousDateWithSwap)
p, err = parseTime(datestr, time.Local, modifiedOpts...)
}
}
}()
}
i := 0
// General strategy is to read rune by rune through the date looking for
// certain hints of what type of date we are dealing with.
// Hopefully we only need to read about 5 or 6 bytes before
// we figure it out and then attempt a parse
iterRunes:
for ; i < len(datestr); i++ {
//r := rune(datestr[i])
r, bytesConsumed := utf8.DecodeRuneInString(datestr[i:])
if bytesConsumed > 1 {
i += (bytesConsumed - 1)
}
//gou.Debugf("i=%d r=%s state=%d %s", i, string(r), p.stateDate, datestr)
switch p.stateDate {
case dateStart:
if unicode.IsDigit(r) {
p.stateDate = dateDigit
} else if unicode.IsLetter(r) {
p.stateDate = dateAlpha
} else {
return nil, unknownErr(datestr)
}
case dateDigit:
switch r {
case '-', '\u2212':
// 2006-01-02
// 2013-Feb-03
// 13-Feb-03
// 29-Jun-2016
if i == 4 {
p.stateDate = dateYearDash
p.yeari = 0
p.yearlen = i
p.moi = i + 1
p.set(0, "2006")
} else {
p.stateDate = dateDigitDash
}
case '/':
// 03/31/2005
// 2014/02/24
p.stateDate = dateDigitSlash
if i == 4 {
p.yearlen = i
p.moi = i + 1
p.setYear()
} else {
p.ambiguousMD = true
if p.preferMonthFirst {
if p.molen == 0 {
p.molen = i
p.setMonth()
p.dayi = i + 1
}
} else {
if p.daylen == 0 {
p.daylen = i
p.setDay()
p.moi = i + 1
}
}
}
case ':':
// 03/31/2005
// 2014/02/24
p.stateDate = dateDigitColon
if i == 4 {
p.yearlen = i
p.moi = i + 1
p.setYear()
} else {
p.ambiguousMD = true
if p.preferMonthFirst {
if p.molen == 0 {
p.molen = i
p.setMonth()
p.dayi = i + 1
}
}
}
case '.':
// 3.31.2014
// 08.21.71
// 2014.05
p.stateDate = dateDigitDot
if i == 4 {
p.yearlen = i
p.moi = i + 1
p.setYear()
} else {
p.ambiguousMD = true
p.moi = 0
p.molen = i
p.setMonth()
p.dayi = i + 1
}
case ' ':
// 18 January 2018
// 8 January 2018
// 8 jan 2018
// 02 Jan 2018 23:59
// 02 Jan 2018 23:59:34
// 12 Feb 2006, 19:17
// 12 Feb 2006, 19:17:22
p.stateDate = dateDigitWs
p.dayi = 0
p.daylen = i
case '年':
// Chinese Year
p.stateDate = dateDigitChineseYear
case ',':
return nil, unknownErr(datestr)
default:
continue
}
p.part1Len = i
case dateYearDash:
// dateYearDashDashT
// 2006-01-02T15:04:05Z07:00
// dateYearDashDashWs
// 2013-04-01 22:43:22
// dateYearDashAlphaDash
// 2013-Feb-03
switch r {
case '-':
p.molen = i - p.moi
p.dayi = i + 1
p.stateDate = dateYearDashDash
p.setMonth()
default:
if unicode.IsLetter(r) {
p.stateDate = dateYearDashAlphaDash
}
}
case dateYearDashDash:
// dateYearDashDashT
// 2006-01-02T15:04:05Z07:00
// dateYearDashDashWs
// 2013-04-01 22:43:22
switch r {
case ' ':
p.daylen = i - p.dayi
p.stateDate = dateYearDashDashWs
p.stateTime = timeStart
p.setDay()
break iterRunes
case 'T':
p.daylen = i - p.dayi
p.stateDate = dateYearDashDashT
p.stateTime = timeStart
p.setDay()
break iterRunes
}
case dateYearDashAlphaDash:
// 2013-Feb-03
switch r {
case '-':
p.molen = i - p.moi
p.set(p.moi, "Jan")
p.dayi = i + 1
}
case dateDigitDash:
// 13-Feb-03
// 29-Jun-2016
if unicode.IsLetter(r) {
p.stateDate = dateDigitDashAlpha
p.moi = i
} else {
return nil, unknownErr(datestr)
}
case dateDigitDashAlpha:
// 13-Feb-03
// 28-Feb-03
// 29-Jun-2016
switch r {
case '-':
p.molen = i - p.moi
p.set(p.moi, "Jan")
p.yeari = i + 1
p.stateDate = dateDigitDashAlphaDash
}
case dateDigitDashAlphaDash:
// 13-Feb-03 ambiguous
// 28-Feb-03 ambiguous
// 29-Jun-2016
switch r {
case ' ':
// we need to find if this was 4 digits, aka year
// or 2 digits which makes it ambiguous year/day
length := i - (p.moi + p.molen + 1)
if length == 4 {
p.yearlen = 4
p.set(p.yeari, "2006")
// We now also know that part1 was the day
p.dayi = 0
p.daylen = p.part1Len
p.setDay()
} else if length == 2 {
// We have no idea if this is
// yy-mon-dd OR dd-mon-yy
//
// We are going to ASSUME (bad, bad) that it is dd-mon-yy which is a horible assumption
p.ambiguousMD = true
p.yearlen = 2
p.set(p.yeari, "06")
// We now also know that part1 was the day
p.dayi = 0
p.daylen = p.part1Len
p.setDay()
}
p.stateTime = timeStart
break iterRunes
}
case dateDigitSlash:
// 2014/07/10 06:55:38.156283
// 03/19/2012 10:11:59
// 04/2/2014 03:00:37
// 3/1/2012 10:11:59
// 4/8/2014 22:05
// 3/1/2014
// 10/13/2014
// 01/02/2006
// 1/2/06
switch r {
case ' ':
p.stateTime = timeStart
if p.yearlen == 0 {
p.yearlen = i - p.yeari
p.setYear()
} else if p.daylen == 0 {
p.daylen = i - p.dayi
p.setDay()
}
break iterRunes
case '/':
if p.yearlen > 0 {
// 2014/07/10 06:55:38.156283
if p.molen == 0 {
p.molen = i - p.moi
p.setMonth()
p.dayi = i + 1
}
} else if p.preferMonthFirst {
if p.daylen == 0 {
p.daylen = i - p.dayi
p.setDay()
p.yeari = i + 1
}
} else {
if p.molen == 0 {
p.molen = i - p.moi
p.setMonth()
p.yeari = i + 1
}
}
}
case dateDigitColon:
// 2014:07:10 06:55:38.156283
// 03:19:2012 10:11:59
// 04:2:2014 03:00:37
// 3:1:2012 10:11:59
// 4:8:2014 22:05
// 3:1:2014
// 10:13:2014
// 01:02:2006
// 1:2:06
switch r {
case ' ':
p.stateTime = timeStart
if p.yearlen == 0 {
p.yearlen = i - p.yeari
p.setYear()
} else if p.daylen == 0 {
p.daylen = i - p.dayi
p.setDay()
}
break iterRunes
case ':':
if p.yearlen > 0 {
// 2014:07:10 06:55:38.156283
if p.molen == 0 {
p.molen = i - p.moi
p.setMonth()
p.dayi = i + 1
}
} else if p.preferMonthFirst {
if p.daylen == 0 {
p.daylen = i - p.dayi
p.setDay()
p.yeari = i + 1
}
}
}
case dateDigitWs:
// 18 January 2018
// 8 January 2018
// 8 jan 2018
// 1 jan 18
// 02 Jan 2018 23:59
// 02 Jan 2018 23:59:34
// 12 Feb 2006, 19:17
// 12 Feb 2006, 19:17:22
switch r {
case ' ':
p.yeari = i + 1
//p.yearlen = 4
p.dayi = 0
p.daylen = p.part1Len
p.setDay()
p.stateTime = timeStart
if i > p.daylen+len(" Sep") { // November etc
// If len greather than space + 3 it must be full month
p.stateDate = dateDigitWsMolong
} else {
// If len=3, the might be Feb or May? Ie ambigous abbreviated but
// we can parse may with either. BUT, that means the
// format may not be correct?
// mo := strings.ToLower(datestr[p.daylen+1 : i])
p.moi = p.daylen + 1
p.molen = i - p.moi
p.set(p.moi, "Jan")
p.stateDate = dateDigitWsMoYear
}
}
case dateDigitWsMoYear:
// 8 jan 2018
// 02 Jan 2018 23:59
// 02 Jan 2018 23:59:34
// 12 Feb 2006, 19:17
// 12 Feb 2006, 19:17:22
switch r {
case ',':
p.yearlen = i - p.yeari
p.setYear()
i++
break iterRunes
case ' ':
p.yearlen = i - p.yeari
p.setYear()
break iterRunes
}
case dateDigitWsMolong:
// 18 January 2018
// 8 January 2018
case dateDigitChineseYear:
// dateDigitChineseYear
// 2014年04月08日
// weekday %Y年%m月%e日 %A %I:%M %p
// 2013年07月18日 星期四 10:27 上午
if r == ' ' {
p.stateDate = dateDigitChineseYearWs
break
}
case dateDigitDot:
// This is the 2nd period
// 3.31.2014
// 08.21.71
// 2014.05
// 2018.09.30
if r == '.' {
if p.moi == 0 {
// 3.31.2014
p.daylen = i - p.dayi
p.yeari = i + 1
p.setDay()
p.stateDate = dateDigitDotDot
} else {
// 2018.09.30
//p.molen = 2
p.molen = i - p.moi
p.dayi = i + 1
p.setMonth()
p.stateDate = dateDigitDotDot
}
}
case dateDigitDotDot:
// iterate all the way through
case dateAlpha:
// dateAlphaWS
// Mon Jan _2 15:04:05 2006
// Mon Jan _2 15:04:05 MST 2006
// Mon Jan 02 15:04:05 -0700 2006
// Mon Aug 10 15:44:11 UTC+0100 2015
// Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time)
// dateAlphaWSDigit
// May 8, 2009 5:57:51 PM
// oct 1, 1970
// dateAlphaWsMonth
// April 8, 2009
// dateAlphaWsMore
// dateAlphaWsAtTime
// January 02, 2006 at 3:04pm MST-07
//
// dateAlphaPeriodWsDigit
// oct. 1, 1970
// dateWeekdayComma
// Monday, 02 Jan 2006 15:04:05 MST
// Monday, 02-Jan-06 15:04:05 MST
// Monday, 02 Jan 2006 15:04:05 -0700
// Monday, 02 Jan 2006 15:04:05 +0100
// dateWeekdayAbbrevComma
// Mon, 02 Jan 2006 15:04:05 MST
// Mon, 02 Jan 2006 15:04:05 -0700
// Thu, 13 Jul 2017 08:58:40 +0100
// Tue, 11 Jul 2017 16:28:13 +0200 (CEST)
// Mon, 02-Jan-06 15:04:05 MST
switch {
case r == ' ':
// X
// April 8, 2009
if i > 3 {
// Check to see if the alpha is name of month? or Day?
month := strings.ToLower(datestr[0:i])
if isMonthFull(month) {
p.fullMonth = month
// len(" 31, 2018") = 9
if len(datestr[i:]) < 10 {
// April 8, 2009
p.stateDate = dateAlphaWsMonth
} else {
p.stateDate = dateAlphaWsMore
}
p.dayi = i + 1
break
}
} else {
// This is possibly ambiguous? May will parse as either though.
// So, it could return in-correct format.
// dateAlphaWs
// May 05, 2005, 05:05:05
// May 05 2005, 05:05:05
// Jul 05, 2005, 05:05:05
// May 8 17:57:51 2009
// May 8 17:57:51 2009
// skip & return to dateStart
// Tue 05 May 2020, 05:05:05
// Mon Jan 2 15:04:05 2006
maybeDay := strings.ToLower(datestr[0:i])
if isDay(maybeDay) {
// using skip throws off indices used by other code; saner to restart
return parseTime(datestr[i+1:], loc)
}
p.stateDate = dateAlphaWs
}
case r == ',':
// Mon, 02 Jan 2006
// p.moi = 0
// p.molen = i
if i == 3 {
p.stateDate = dateWeekdayAbbrevComma
p.set(0, "Mon")
} else {
p.stateDate = dateWeekdayComma
p.skip = i + 2
i++
// TODO: lets just make this "skip" as we don't need
// the mon, monday, they are all superfelous and not needed
// just lay down the skip, no need to fill and then skip
}
case r == '.':
// sept. 28, 2017
// jan. 28, 2017
p.stateDate = dateAlphaPeriodWsDigit
if i == 3 {
p.molen = i
p.set(0, "Jan")
} else if i == 4 {
// gross
datestr = datestr[0:i-1] + datestr[i:]
return parseTime(datestr, loc, opts...)
} else {
return nil, unknownErr(datestr)
}
}
case dateAlphaWs:
// dateAlphaWsAlpha
// Mon Jan _2 15:04:05 2006
// Mon Jan _2 15:04:05 MST 2006
// Mon Jan 02 15:04:05 -0700 2006
// Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time)
// Mon Aug 10 15:44:11 UTC+0100 2015
// dateAlphaWsDigit
// May 8, 2009 5:57:51 PM
// May 8 2009 5:57:51 PM
// May 8 17:57:51 2009
// May 8 17:57:51 2009
// May 08 17:57:51 2009
// oct 1, 1970
// oct 7, '70
switch {
case unicode.IsLetter(r):
p.set(0, "Mon")
p.stateDate = dateAlphaWsAlpha
p.set(i, "Jan")
case unicode.IsDigit(r):
p.set(0, "Jan")
p.stateDate = dateAlphaWsDigit
p.dayi = i
}
case dateAlphaWsDigit:
// May 8, 2009 5:57:51 PM
// May 8 2009 5:57:51 PM
// oct 1, 1970
// oct 7, '70
// oct. 7, 1970
// May 8 17:57:51 2009
// May 8 17:57:51 2009
// May 08 17:57:51 2009
if r == ',' {
p.daylen = i - p.dayi
p.setDay()
p.stateDate = dateAlphaWsDigitMore
} else if r == ' ' {
p.daylen = i - p.dayi
p.setDay()
p.yeari = i + 1
p.stateDate = dateAlphaWsDigitYearmaybe
p.stateTime = timeStart
} else if unicode.IsLetter(r) {
p.stateDate = dateAlphaWsMonthSuffix
i--
}
case dateAlphaWsDigitYearmaybe:
// x
// May 8 2009 5:57:51 PM
// May 8 17:57:51 2009
// May 8 17:57:51 2009
// May 08 17:57:51 2009
// Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time)
if r == ':' {
// Guessed wrong; was not a year
i = i - 3
p.stateDate = dateAlphaWsDigit
p.yeari = 0
break iterRunes
} else if r == ' ' {
// must be year format, not 15:04
p.yearlen = i - p.yeari
p.setYear()
break iterRunes
}
case dateAlphaWsDigitMore:
// x
// May 8, 2009 5:57:51 PM
// May 05, 2005, 05:05:05
// May 05 2005, 05:05:05
// oct 1, 1970
// oct 7, '70
if r == ' ' {
p.yeari = i + 1
p.stateDate = dateAlphaWsDigitMoreWs
}
case dateAlphaWsDigitMoreWs:
// x
// May 8, 2009 5:57:51 PM
// May 05, 2005, 05:05:05
// oct 1, 1970
// oct 7, '70
switch r {
case '\'':
p.yeari = i + 1
case ' ', ',':
// x
// May 8, 2009 5:57:51 PM
// x
// May 8, 2009, 5:57:51 PM
p.stateDate = dateAlphaWsDigitMoreWsYear
p.yearlen = i - p.yeari
p.setYear()
p.stateTime = timeStart
break iterRunes
}
case dateAlphaWsMonth:
// April 8, 2009
// April 8 2009
switch r {
case ' ', ',':
// x
// June 8, 2009
// x
// June 8 2009
if p.daylen == 0 {
p.daylen = i - p.dayi
p.setDay()
}
case 's', 'S', 'r', 'R', 't', 'T', 'n', 'N':
// st, rd, nd, st
i--
p.stateDate = dateAlphaWsMonthSuffix
default:
if p.daylen > 0 && p.yeari == 0 {
p.yeari = i
}
}
case dateAlphaWsMonthMore:
// X
// January 02, 2006, 15:04:05
// January 02 2006, 15:04:05
// January 02, 2006 15:04:05
// January 02 2006 15:04:05
switch r {
case ',':
p.yearlen = i - p.yeari
p.setYear()
p.stateTime = timeStart
i++
break iterRunes
case ' ':
p.yearlen = i - p.yeari
p.setYear()
p.stateTime = timeStart
break iterRunes
}
case dateAlphaWsMonthSuffix:
// x
// April 8th, 2009
// April 8th 2009
switch r {
case 't', 'T':
if p.nextIs(i, 'h') || p.nextIs(i, 'H') {
if len(datestr) > i+2 {
return parseTime(fmt.Sprintf("%s%s", p.datestr[0:i], p.datestr[i+2:]), loc, opts...)
}
}
case 'n', 'N':
if p.nextIs(i, 'd') || p.nextIs(i, 'D') {
if len(datestr) > i+2 {
return parseTime(fmt.Sprintf("%s%s", p.datestr[0:i], p.datestr[i+2:]), loc, opts...)
}
}
case 's', 'S':
if p.nextIs(i, 't') || p.nextIs(i, 'T') {
if len(datestr) > i+2 {
return parseTime(fmt.Sprintf("%s%s", p.datestr[0:i], p.datestr[i+2:]), loc, opts...)
}
}
case 'r', 'R':
if p.nextIs(i, 'd') || p.nextIs(i, 'D') {
if len(datestr) > i+2 {
return parseTime(fmt.Sprintf("%s%s", p.datestr[0:i], p.datestr[i+2:]), loc, opts...)
}
}
}
case dateAlphaWsMore:
// January 02, 2006, 15:04:05
// January 02 2006, 15:04:05
// January 2nd, 2006, 15:04:05
// January 2nd 2006, 15:04:05
// September 17, 2012 at 5:00pm UTC-05
switch {
case r == ',':
// x
// January 02, 2006, 15:04:05
if p.nextIs(i, ' ') {
p.daylen = i - p.dayi
p.setDay()
p.yeari = i + 2
p.stateDate = dateAlphaWsMonthMore
i++
}
case r == ' ':
// x
// January 02 2006, 15:04:05
p.daylen = i - p.dayi
p.setDay()
p.yeari = i + 1
p.stateDate = dateAlphaWsMonthMore
case unicode.IsDigit(r):
// XX
// January 02, 2006, 15:04:05
continue
case unicode.IsLetter(r):
// X
// January 2nd, 2006, 15:04:05
p.daylen = i - p.dayi
p.setDay()
p.stateDate = dateAlphaWsMonthSuffix
i--
}
case dateAlphaPeriodWsDigit:
// oct. 7, '70
switch {
case r == ' ':
// continue
case unicode.IsDigit(r):
p.stateDate = dateAlphaWsDigit
p.dayi = i
default:
return p, unknownErr(datestr)
}
case dateWeekdayComma:
// Monday, 02 Jan 2006 15:04:05 MST
// Monday, 02 Jan 2006 15:04:05 -0700
// Monday, 02 Jan 2006 15:04:05 +0100
// Monday, 02-Jan-06 15:04:05 MST
if p.dayi == 0 {
p.dayi = i
}
switch r {
case ' ', '-':
if p.moi == 0 {
p.moi = i + 1
p.daylen = i - p.dayi
p.setDay()
} else if p.yeari == 0 {
p.yeari = i + 1
p.molen = i - p.moi
p.set(p.moi, "Jan")
} else {
p.stateTime = timeStart
break iterRunes
}
}
case dateWeekdayAbbrevComma:
// Mon, 02 Jan 2006 15:04:05 MST
// Mon, 02 Jan 2006 15:04:05 -0700
// Thu, 13 Jul 2017 08:58:40 +0100
// Thu, 4 Jan 2018 17:53:36 +0000
// Tue, 11 Jul 2017 16:28:13 +0200 (CEST)
// Mon, 02-Jan-06 15:04:05 MST
switch r {
case ' ', '-':
if p.dayi == 0 {
p.dayi = i + 1
} else if p.moi == 0 {
p.daylen = i - p.dayi
p.setDay()
p.moi = i + 1
} else if p.yeari == 0 {
p.molen = i - p.moi
p.set(p.moi, "Jan")
p.yeari = i + 1
} else {
p.yearlen = i - p.yeari
p.setYear()
p.stateTime = timeStart
break iterRunes
}
}
default:
break iterRunes
}
}
p.coalesceDate(i)
if p.stateTime == timeStart {
// increment first one, since the i++ occurs at end of loop
if i < len(p.datestr) {
i++
}
// ensure we skip any whitespace prefix
for ; i < len(datestr); i++ {
r := rune(datestr[i])
if r != ' ' {
break
}
}
iterTimeRunes:
for ; i < len(datestr); i++ {
r := rune(datestr[i])
//gou.Debugf("%d %s %d iterTimeRunes %s %s", i, string(r), p.stateTime, p.ds(), p.ts())
switch p.stateTime {
case timeStart:
// 22:43:22
// 22:43
// timeComma
// 08:20:13,787
// timeWs
// 05:24:37 PM
// 06:20:00 UTC
// 06:20:00 UTC-05
// 00:12:00 +0000 UTC
// 22:18:00 +0000 UTC m=+0.000000001
// 15:04:05 -0700
// 15:04:05 -07:00
// 15:04:05 2008
// timeOffset
// 03:21:51+00:00
// 19:55:00+0100
// timePeriod
// 17:24:37.3186369
// 00:07:31.945167
// 18:31:59.257000000
// 00:00:00.000
// timePeriodOffset
// 19:55:00.799+0100
// timePeriodOffsetColon
// 15:04:05.999-07:00
// timePeriodWs
// timePeriodWsOffset
// 00:07:31.945167 +0000
// 00:00:00.000 +0000
// timePeriodWsOffsetAlpha
// 00:07:31.945167 +0000 UTC
// 22:18:00.001 +0000 UTC m=+0.000000001
// 00:00:00.000 +0000 UTC
// timePeriodWsAlpha
// 06:20:00.000 UTC
if p.houri == 0 {
p.houri = i
}
switch r {
case ',':
// hm, lets just swap out comma for period. for some reason go
// won't parse it.
// 2014-05-11 08:20:13,787
ds := []byte(p.datestr)
ds[i] = '.'
return parseTime(string(ds), loc, opts...)
case '-', '+':
// 03:21:51+00:00
p.stateTime = timeOffset
if p.seci == 0 {
// 22:18+0530
p.minlen = i - p.mini
} else {
p.seclen = i - p.seci
}
p.offseti = i
case '.':
p.stateTime = timePeriod
p.seclen = i - p.seci
p.msi = i + 1
case 'Z':
p.stateTime = timeZ
if p.seci == 0 {
p.minlen = i - p.mini
} else {
p.seclen = i - p.seci
}
// (Z)ulu time
p.loc = time.UTC
case 'a', 'A':
if p.nextIs(i, 't') || p.nextIs(i, 'T') {
// x
// September 17, 2012 at 5:00pm UTC-05
i++ // skip t
if p.nextIs(i, ' ') {
// x
// September 17, 2012 at 5:00pm UTC-05
i++ // skip '
p.houri = 0 // reset hour
}
} else {
switch {
case r == 'a' && p.nextIs(i, 'm'):
p.coalesceTime(i)
p.set(i, "am")
case r == 'A' && p.nextIs(i, 'M'):
p.coalesceTime(i)
p.set(i, "PM")
}
}
case 'p', 'P':
// Could be AM/PM
switch {
case r == 'p' && p.nextIs(i, 'm'):
p.coalesceTime(i)
p.set(i, "pm")
case r == 'P' && p.nextIs(i, 'M'):
p.coalesceTime(i)
p.set(i, "PM")
}
case ' ':
p.coalesceTime(i)
p.stateTime = timeWs
case ':':
if p.mini == 0 {
p.mini = i + 1
p.hourlen = i - p.houri
} else if p.seci == 0 {
p.seci = i + 1
p.minlen = i - p.mini
}
}
case timeOffset:
// 19:55:00+0100
// timeOffsetColon
// 15:04:05+07:00
// 15:04:05-07:00
if r == ':' {
p.stateTime = timeOffsetColon
}
case timeWs:
// timeWsAlpha
// 06:20:00 UTC
// 06:20:00 UTC-05
// 15:44:11 UTC+0100 2015
// 18:04:07 GMT+0100 (GMT Daylight Time)
// 17:57:51 MST 2009
// timeWsAMPMMaybe
// 05:24:37 PM
// timeWsOffset
// 15:04:05 -0700
// 00:12:00 +0000 UTC
// timeWsOffsetColon
// 15:04:05 -07:00
// 17:57:51 -0700 2009
// timeWsOffsetColonAlpha
// 00:12:00 +00:00 UTC
// timeWsYear
// 00:12:00 2008
// timeZ
// 15:04:05.99Z
switch r {
case 'A', 'P':
// Could be AM/PM or could be PST or similar
p.tzi = i
p.stateTime = timeWsAMPMMaybe
case '+', '-':
p.offseti = i
p.stateTime = timeWsOffset
default:
if unicode.IsLetter(r) {
// 06:20:00 UTC
// 06:20:00 UTC-05
// 15:44:11 UTC+0100 2015
// 17:57:51 MST 2009
p.tzi = i
p.stateTime = timeWsAlpha
//break iterTimeRunes
} else if unicode.IsDigit(r) {
// 00:12:00 2008
p.stateTime = timeWsYear
p.yeari = i
}
}
case timeWsAlpha:
// 06:20:00 UTC
// 06:20:00 UTC-05
// timeWsAlphaWs
// 17:57:51 MST 2009
// timeWsAlphaZoneOffset
// timeWsAlphaZoneOffsetWs
// timeWsAlphaZoneOffsetWsExtra
// 18:04:07 GMT+0100 (GMT Daylight Time)
// timeWsAlphaZoneOffsetWsYear
// 15:44:11 UTC+0100 2015
switch r {
case '+', '-':
p.tzlen = i - p.tzi
if p.tzlen == 4 {
p.set(p.tzi, " MST")
} else if p.tzlen == 3 {
p.set(p.tzi, "MST")
}
p.stateTime = timeWsAlphaZoneOffset
p.offseti = i
case ' ':
// 17:57:51 MST 2009
p.tzlen = i - p.tzi
if p.tzlen == 4 {
p.set(p.tzi, " MST")
} else if p.tzlen == 3 {
p.set(p.tzi, "MST")
}
p.stateTime = timeWsAlphaWs
p.yeari = i + 1
}
case timeWsAlphaWs:
// 17:57:51 MST 2009
case timeWsAlphaZoneOffset:
// 06:20:00 UTC-05
// timeWsAlphaZoneOffset
// timeWsAlphaZoneOffsetWs
// timeWsAlphaZoneOffsetWsExtra
// 18:04:07 GMT+0100 (GMT Daylight Time)
// timeWsAlphaZoneOffsetWsYear
// 15:44:11 UTC+0100 2015
switch r {
case ' ':
p.set(p.offseti, "-0700")
if p.yeari == 0 {
p.yeari = i + 1
}
p.stateTime = timeWsAlphaZoneOffsetWs
}
case timeWsAlphaZoneOffsetWs:
// timeWsAlphaZoneOffsetWs
// timeWsAlphaZoneOffsetWsExtra
// 18:04:07 GMT+0100 (GMT Daylight Time)
// timeWsAlphaZoneOffsetWsYear
// 15:44:11 UTC+0100 2015
if unicode.IsDigit(r) {
p.stateTime = timeWsAlphaZoneOffsetWsYear
} else {
p.extra = i - 1
p.stateTime = timeWsAlphaZoneOffsetWsExtra
}
case timeWsAlphaZoneOffsetWsYear:
// 15:44:11 UTC+0100 2015
if unicode.IsDigit(r) {
p.yearlen = i - p.yeari + 1
if p.yearlen == 4 {
p.setYear()
}
}
case timeWsAMPMMaybe:
// timeWsAMPMMaybe
// timeWsAMPM
// 05:24:37 PM
// timeWsAlpha
// 00:12:00 PST
// 15:44:11 UTC+0100 2015
if r == 'M' {
//return parse("2006-01-02 03:04:05 PM", datestr, loc)
p.stateTime = timeWsAMPM
p.set(i-1, "PM")
if p.hourlen == 2 {
p.set(p.houri, "03")
} else if p.hourlen == 1 {
p.set(p.houri, "3")
}
} else {
p.stateTime = timeWsAlpha
}
case timeWsOffset:
// timeWsOffset
// 15:04:05 -0700
// timeWsOffsetWsOffset
// 17:57:51 -0700 -07
// timeWsOffsetWs
// 17:57:51 -0700 2009
// 00:12:00 +0000 UTC
// timeWsOffsetColon
// 15:04:05 -07:00
// timeWsOffsetColonAlpha
// 00:12:00 +00:00 UTC
switch r {
case ':':
p.stateTime = timeWsOffsetColon
case ' ':
p.set(p.offseti, "-0700")
p.yeari = i + 1
p.stateTime = timeWsOffsetWs
}
case timeWsOffsetWs:
// 17:57:51 -0700 2009
// 00:12:00 +0000 UTC
// 22:18:00.001 +0000 UTC m=+0.000000001
// w Extra
// 17:57:51 -0700 -07
switch r {
case '=':
// eff you golang
if datestr[i-1] == 'm' {
p.extra = i - 2
p.trimExtra()
break
}
case '+', '-':
// This really doesn't seem valid, but for some reason when round-tripping a go date
// their is an extra +03 printed out. seems like go bug to me, but, parsing anyway.
// 00:00:00 +0300 +03
// 00:00:00 +0300 +0300
p.extra = i - 1
p.stateTime = timeWsOffset
p.trimExtra()
break
default:
switch {
case unicode.IsDigit(r):
p.yearlen = i - p.yeari + 1
if p.yearlen == 4 {
p.setYear()
}
case unicode.IsLetter(r):
if p.tzi == 0 {
p.tzi = i
}
}
}
case timeWsOffsetColon:
// timeWsOffsetColon
// 15:04:05 -07:00
// timeWsOffsetColonAlpha
// 2015-02-18 00:12:00 +00:00 UTC
if unicode.IsLetter(r) {
// 2015-02-18 00:12:00 +00:00 UTC
p.stateTime = timeWsOffsetColonAlpha
break iterTimeRunes
}
case timePeriod:
// 15:04:05.999999999+07:00
// 15:04:05.999999999-07:00
// 15:04:05.999999+07:00
// 15:04:05.999999-07:00
// 15:04:05.999+07:00
// 15:04:05.999-07:00
// timePeriod
// 17:24:37.3186369
// 00:07:31.945167
// 18:31:59.257000000
// 00:00:00.000
// timePeriodOffset
// 19:55:00.799+0100
// timePeriodOffsetColon
// 15:04:05.999-07:00
// timePeriodWs
// timePeriodWsOffset
// 00:07:31.945167 +0000
// 00:00:00.000 +0000
// With Extra
// 00:00:00.000 +0300 +03
// timePeriodWsOffsetAlpha
// 00:07:31.945167 +0000 UTC
// 00:00:00.000 +0000 UTC
// 22:18:00.001 +0000 UTC m=+0.000000001
// timePeriodWsAlpha
// 06:20:00.000 UTC
switch r {
case ' ':
p.mslen = i - p.msi
p.stateTime = timePeriodWs
case '+', '-':
// This really shouldn't happen
p.mslen = i - p.msi
p.offseti = i
p.stateTime = timePeriodOffset
default:
if unicode.IsLetter(r) {
// 06:20:00.000 UTC
p.mslen = i - p.msi
p.stateTime = timePeriodWsAlpha
}
}
case timePeriodOffset:
// timePeriodOffset
// 19:55:00.799+0100
// timePeriodOffsetColon
// 15:04:05.999-07:00
// 13:31:51.999-07:00 MST
if r == ':' {
p.stateTime = timePeriodOffsetColon
}
case timePeriodOffsetColon:
// timePeriodOffset
// timePeriodOffsetColon
// 15:04:05.999-07:00
// 13:31:51.999 -07:00 MST
switch r {
case ' ':
p.set(p.offseti, "-07:00")
p.stateTime = timePeriodOffsetColonWs
p.tzi = i + 1
}
case timePeriodOffsetColonWs:
// continue
case timePeriodWs:
// timePeriodWs
// timePeriodWsOffset
// 00:07:31.945167 +0000
// 00:00:00.000 +0000
// timePeriodWsOffsetAlpha
// 00:07:31.945167 +0000 UTC
// 00:00:00.000 +0000 UTC
// timePeriodWsOffsetColon
// 13:31:51.999 -07:00 MST
// timePeriodWsAlpha
// 06:20:00.000 UTC
if p.offseti == 0 {
p.offseti = i
}
switch r {
case '+', '-':
p.mslen = i - p.msi - 1
p.stateTime = timePeriodWsOffset
default:
if unicode.IsLetter(r) {
// 00:07:31.945167 +0000 UTC
// 00:00:00.000 +0000 UTC
p.stateTime = timePeriodWsOffsetWsAlpha
break iterTimeRunes
}
}
case timePeriodWsOffset:
// timePeriodWs
// timePeriodWsOffset
// 00:07:31.945167 +0000
// 00:00:00.000 +0000
// With Extra
// 00:00:00.000 +0300 +03
// timePeriodWsOffsetAlpha
// 00:07:31.945167 +0000 UTC
// 00:00:00.000 +0000 UTC
// 03:02:00.001 +0300 MSK m=+0.000000001
// timePeriodWsOffsetColon
// 13:31:51.999 -07:00 MST
// timePeriodWsAlpha
// 06:20:00.000 UTC
switch r {
case ':':
p.stateTime = timePeriodWsOffsetColon
case ' ':
p.set(p.offseti, "-0700")
case '+', '-':
// This really doesn't seem valid, but for some reason when round-tripping a go date
// their is an extra +03 printed out. seems like go bug to me, but, parsing anyway.
// 00:00:00.000 +0300 +03
// 00:00:00.000 +0300 +0300
p.extra = i - 1
p.trimExtra()
break
default:
if unicode.IsLetter(r) {
// 00:07:31.945167 +0000 UTC
// 00:00:00.000 +0000 UTC
// 03:02:00.001 +0300 MSK m=+0.000000001
p.stateTime = timePeriodWsOffsetWsAlpha
}
}
case timePeriodWsOffsetWsAlpha:
// 03:02:00.001 +0300 MSK m=+0.000000001
// eff you golang
if r == '=' && datestr[i-1] == 'm' {
p.extra = i - 2
p.trimExtra()
break
}
case timePeriodWsOffsetColon:
// 13:31:51.999 -07:00 MST
switch r {
case ' ':
p.set(p.offseti, "-07:00")
default:
if unicode.IsLetter(r) {
// 13:31:51.999 -07:00 MST
p.tzi = i
p.stateTime = timePeriodWsOffsetColonAlpha
}
}
case timePeriodWsOffsetColonAlpha:
// continue
case timeZ:
// timeZ
// 15:04:05.99Z
// With a time-zone at end after Z
// 2006-01-02T15:04:05.999999999Z07:00
// 2006-01-02T15:04:05Z07:00
// RFC3339 = "2006-01-02T15:04:05Z07:00"
// RFC3339Nano = "2006-01-02T15:04:05.999999999Z07:00"
if unicode.IsDigit(r) {
p.stateTime = timeZDigit
}
}
}
switch p.stateTime {
case timeWsAlphaWs:
p.yearlen = i - p.yeari
p.setYear()
case timeWsYear:
p.yearlen = i - p.yeari
p.setYear()
case timeWsAlphaZoneOffsetWsExtra:
p.trimExtra()
case timeWsAlphaZoneOffset:
// 06:20:00 UTC-05
if i-p.offseti < 4 {
p.set(p.offseti, "-07")
} else {
p.set(p.offseti, "-0700")
}
case timePeriod:
p.mslen = i - p.msi
case timeOffset:
// 19:55:00+0100
p.set(p.offseti, "-0700")
case timeWsOffset:
p.set(p.offseti, "-0700")
case timeWsOffsetWs:
// 17:57:51 -0700 2009
// 00:12:00 +0000 UTC
case timeWsOffsetColon:
// 17:57:51 -07:00
p.set(p.offseti, "-07:00")
case timeOffsetColon:
// 15:04:05+07:00
p.set(p.offseti, "-07:00")
case timePeriodOffset:
// 19:55:00.799+0100
p.set(p.offseti, "-0700")
case timePeriodOffsetColon:
p.set(p.offseti, "-07:00")
case timePeriodWsOffsetColonAlpha:
p.tzlen = i - p.tzi
switch p.tzlen {
case 3:
p.set(p.tzi, "MST")
case 4:
p.set(p.tzi, "MST ")
}
case timePeriodWsOffset:
p.set(p.offseti, "-0700")
}
p.coalesceTime(i)
}
switch p.stateDate {
case dateDigit:
// unixy timestamps ish
// example ct type
// 1499979655583057426 19 nanoseconds
// 1499979795437000 16 micro-seconds
// 20180722105203 14 yyyyMMddhhmmss
// 1499979795437 13 milliseconds
// 1332151919 10 seconds
// 20140601 8 yyyymmdd
// 2014 4 yyyy
t := time.Time{}
if len(datestr) == len("1499979655583057426") { // 19
// nano-seconds
if nanoSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
t = time.Unix(0, nanoSecs)
}
} else if len(datestr) == len("1499979795437000") { // 16
// micro-seconds
if microSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
t = time.Unix(0, microSecs*1000)
}
} else if len(datestr) == len("yyyyMMddhhmmss") { // 14
// yyyyMMddhhmmss
p.format = []byte("20060102150405")
return p, nil
} else if len(datestr) == len("1332151919000") { // 13
if miliSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
t = time.Unix(0, miliSecs*1000*1000)
}
} else if len(datestr) == len("1332151919") { //10
if secs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
t = time.Unix(secs, 0)
}
} else if len(datestr) == len("20140601") {
p.format = []byte("20060102")
return p, nil
} else if len(datestr) == len("2014") {
p.format = []byte("2006")
return p, nil
} else if len(datestr) < 4 {
return nil, fmt.Errorf("unrecognized format, too short %v", datestr)
}
if !t.IsZero() {
if loc == nil {
p.t = &t
return p, nil
}
t = t.In(loc)
p.t = &t
return p, nil
}
case dateYearDash:
// 2006-01
return p, nil
case dateYearDashDash:
// 2006-01-02
// 2006-1-02
// 2006-1-2
// 2006-01-2
return p, nil
case dateYearDashAlphaDash:
// 2013-Feb-03
// 2013-Feb-3
p.daylen = i - p.dayi
p.setDay()
return p, nil
case dateYearDashDashWs:
// 2013-04-01
return p, nil
case dateYearDashDashT:
return p, nil
case dateDigitDashAlphaDash:
// 13-Feb-03 ambiguous
// 28-Feb-03 ambiguous
// 29-Jun-2016
length := len(datestr) - (p.moi + p.molen + 1)
if length == 4 {
p.yearlen = 4
p.set(p.yeari, "2006")
// We now also know that part1 was the day
p.dayi = 0
p.daylen = p.part1Len
p.setDay()
} else if length == 2 {
// We have no idea if this is
// yy-mon-dd OR dd-mon-yy
//
// We are going to ASSUME (bad, bad) that it is dd-mon-yy which is a horible assumption
p.ambiguousMD = true
p.yearlen = 2
p.set(p.yeari, "06")
// We now also know that part1 was the day
p.dayi = 0
p.daylen = p.part1Len
p.setDay()
}
return p, nil
case dateDigitDot:
// 2014.05
p.molen = i - p.moi
p.setMonth()
return p, nil
case dateDigitDotDot:
// 03.31.1981
// 3.31.2014
// 3.2.1981
// 3.2.81
// 08.21.71
// 2018.09.30
return p, nil
case dateDigitWsMoYear:
// 2 Jan 2018
// 2 Jan 18
// 2 Jan 2018 23:59
// 02 Jan 2018 23:59
// 12 Feb 2006, 19:17
return p, nil
case dateDigitWsMolong:
// 18 January 2018
// 8 January 2018
if p.daylen == 2 {
p.format = []byte("02 January 2006")
return p, nil
}
p.format = []byte("2 January 2006")
return p, nil // parse("2 January 2006", datestr, loc)
case dateAlphaWsMonth:
p.yearlen = i - p.yeari
p.setYear()
return p, nil
case dateAlphaWsMonthMore:
return p, nil
case dateAlphaWsDigitMoreWs:
// oct 1, 1970
p.yearlen = i - p.yeari
p.setYear()
return p, nil
case dateAlphaWsDigitMoreWsYear:
// May 8, 2009 5:57:51 PM
// Jun 7, 2005, 05:57:51
return p, nil
case dateAlphaWsAlpha:
return p, nil
case dateAlphaWsDigit:
return p, nil
case dateAlphaWsDigitYearmaybe:
return p, nil
case dateDigitSlash:
// 3/1/2014
// 10/13/2014
// 01/02/2006
// 2014/10/13
return p, nil
case dateDigitColon:
// 3:1:2014
// 10:13:2014
// 01:02:2006
// 2014:10:13
return p, nil
case dateDigitChineseYear:
// dateDigitChineseYear
// 2014年04月08日
p.format = []byte("2006年01月02日")
return p, nil
case dateDigitChineseYearWs:
p.format = []byte("2006年01月02日 15:04:05")
return p, nil
case dateWeekdayComma:
// Monday, 02 Jan 2006 15:04:05 -0700
// Monday, 02 Jan 2006 15:04:05 +0100
// Monday, 02-Jan-06 15:04:05 MST
return p, nil
case dateWeekdayAbbrevComma:
// Mon, 02-Jan-06 15:04:05 MST
// Mon, 02 Jan 2006 15:04:05 MST
return p, nil
}
return nil, unknownErr(datestr)
}
type parser struct {
loc *time.Location
preferMonthFirst bool
retryAmbiguousDateWithSwap bool
ambiguousMD bool
stateDate dateState
stateTime timeState
format []byte
datestr string
fullMonth string
skip int
extra int
part1Len int
yeari int
yearlen int
moi int
molen int
dayi int
daylen int
houri int
hourlen int
mini int
minlen int
seci int
seclen int
msi int
mslen int
offseti int
offsetlen int
tzi int
tzlen int
t *time.Time
}
// ParserOption defines a function signature implemented by options
// Options defined like this accept the parser and operate on the data within
type ParserOption func(*parser) error
// PreferMonthFirst is an option that allows preferMonthFirst to be changed from its default
func PreferMonthFirst(preferMonthFirst bool) ParserOption {
return func(p *parser) error {
p.preferMonthFirst = preferMonthFirst
return nil
}
}
// RetryAmbiguousDateWithSwap is an option that allows retryAmbiguousDateWithSwap to be changed from its default
func RetryAmbiguousDateWithSwap(retryAmbiguousDateWithSwap bool) ParserOption {
return func(p *parser) error {
p.retryAmbiguousDateWithSwap = retryAmbiguousDateWithSwap
return nil
}
}
func newParser(dateStr string, loc *time.Location, opts ...ParserOption) *parser {
p := &parser{
stateDate: dateStart,
stateTime: timeIgnore,
datestr: dateStr,
loc: loc,
preferMonthFirst: true,
retryAmbiguousDateWithSwap: false,
}
p.format = []byte(dateStr)
// allow the options to mutate the parser fields from their defaults
for _, option := range opts {
option(p)
}
return p
}
func (p *parser) nextIs(i int, b byte) bool {
if len(p.datestr) > i+1 && p.datestr[i+1] == b {
return true
}
return false
}
func (p *parser) set(start int, val string) {
if start < 0 {
return
}
if len(p.format) < start+len(val) {
return
}
for i, r := range val {
p.format[start+i] = byte(r)
}
}
func (p *parser) setMonth() {
if p.molen == 2 {
p.set(p.moi, "01")
} else if p.molen == 1 {
p.set(p.moi, "1")
}
}
func (p *parser) setDay() {
if p.daylen == 2 {
p.set(p.dayi, "02")
} else if p.daylen == 1 {
p.set(p.dayi, "2")
}
}
func (p *parser) setYear() {
if p.yearlen == 2 {
p.set(p.yeari, "06")
} else if p.yearlen == 4 {
p.set(p.yeari, "2006")
}
}
func (p *parser) coalesceDate(end int) {
if p.yeari > 0 {
if p.yearlen == 0 {
p.yearlen = end - p.yeari
}
p.setYear()
}
if p.moi > 0 && p.molen == 0 {
p.molen = end - p.moi
p.setMonth()
}
if p.dayi > 0 && p.daylen == 0 {
p.daylen = end - p.dayi
p.setDay()
}
}
func (p *parser) ts() string {
return fmt.Sprintf("h:(%d:%d) m:(%d:%d) s:(%d:%d)", p.houri, p.hourlen, p.mini, p.minlen, p.seci, p.seclen)
}
func (p *parser) ds() string {
return fmt.Sprintf("%s d:(%d:%d) m:(%d:%d) y:(%d:%d)", p.datestr, p.dayi, p.daylen, p.moi, p.molen, p.yeari, p.yearlen)
}
func (p *parser) coalesceTime(end int) {
// 03:04:05
// 15:04:05
// 3:04:05
// 3:4:5
// 15:04:05.00
if p.houri > 0 {
if p.hourlen == 2 {
p.set(p.houri, "15")
} else if p.hourlen == 1 {
p.set(p.houri, "3")
}
}
if p.mini > 0 {
if p.minlen == 0 {
p.minlen = end - p.mini
}
if p.minlen == 2 {
p.set(p.mini, "04")
} else {
p.set(p.mini, "4")
}
}
if p.seci > 0 {
if p.seclen == 0 {
p.seclen = end - p.seci
}
if p.seclen == 2 {
p.set(p.seci, "05")
} else {
p.set(p.seci, "5")
}
}
if p.msi > 0 {
for i := 0; i < p.mslen; i++ {
p.format[p.msi+i] = '0'
}
}
}
func (p *parser) setFullMonth(month string) {
if p.moi == 0 {
p.format = []byte(fmt.Sprintf("%s%s", "January", p.format[len(month):]))
}
}
func (p *parser) trimExtra() {
if p.extra > 0 && len(p.format) > p.extra {
p.format = p.format[0:p.extra]
p.datestr = p.datestr[0:p.extra]
}
}
// func (p *parser) remove(i, length int) {
// if len(p.format) > i+length {
// //append(a[:i], a[j:]...)
// p.format = append(p.format[0:i], p.format[i+length:]...)
// }
// if len(p.datestr) > i+length {
// //append(a[:i], a[j:]...)
// p.datestr = fmt.Sprintf("%s%s", p.datestr[0:i], p.datestr[i+length:])
// }
// }
func (p *parser) parse() (time.Time, error) {
if p.t != nil {
return *p.t, nil
}
if len(p.fullMonth) > 0 {
p.setFullMonth(p.fullMonth)
}
if p.skip > 0 && len(p.format) > p.skip {
p.format = p.format[p.skip:]
p.datestr = p.datestr[p.skip:]
}
if p.loc == nil {
return time.Parse(string(p.format), p.datestr)
}
return time.ParseInLocation(string(p.format), p.datestr, p.loc)
}
func isDay(alpha string) bool {
for _, day := range days {
if alpha == day {
return true
}
}
return false
}
func isMonthFull(alpha string) bool {
for _, month := range months {
if alpha == month {
return true
}
}
return false
}
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