mirror of
https://github.com/araddon/dateparse.git
synced 2024-09-20 02:55:43 +08:00
417 lines
11 KiB
Go
417 lines
11 KiB
Go
package dateparse
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import (
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"fmt"
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u "github.com/araddon/gou"
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"strconv"
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"time"
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"unicode"
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"unicode/utf8"
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)
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type DateState int
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const (
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ST_START DateState = iota
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ST_DIGIT
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ST_DIGITDASH
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ST_DIGITDASHWS
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ST_DIGITDASHT
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ST_DIGITCOMMA
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ST_DIGITCOLON
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ST_DIGITSLASH
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ST_DIGITSLASHWS
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ST_DIGITSLASHWSCOLON
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ST_DIGITSLASHWSCOLONCOLON
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ST_ALPHA
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ST_ALPHAWS
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ST_ALPHAWSCOMMA
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ST_ALPHAWSALPHA
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ST_ALPHACOMMA
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ST_ALPHACOMMADASH
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ST_ALPHACOMMADASHDASH
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//ST_ALPHADIGIT
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)
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var _ = u.EMPTY
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// Given an unknown date format, detect the type, parse, return time
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func ParseAny(datestr string) (time.Time, error) {
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state := ST_START
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// General strategy is to read rune by rune through the date looking for
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// certain hints of what type of date we are dealing with.
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// Hopefully we only need to read about 5 or 6 bytes before
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// we figure it out and then attempt a parse
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iterRunes:
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for i := 0; i < len(datestr); i++ {
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r, bytesConsumed := utf8.DecodeRuneInString(datestr[i:])
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if bytesConsumed > 1 {
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i += (bytesConsumed - 1)
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}
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switch state {
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case ST_START:
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if unicode.IsDigit(r) {
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state = ST_DIGIT
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} else if unicode.IsLetter(r) {
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state = ST_ALPHA
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}
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case ST_DIGIT: // starts digits
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if unicode.IsDigit(r) {
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continue
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}
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switch r {
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case ',':
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state = ST_DIGITCOMMA
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case '-':
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state = ST_DIGITDASH
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case ':':
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state = ST_DIGITCOLON
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case '/':
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state = ST_DIGITSLASH
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}
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case ST_DIGITDASH: // starts digit then dash 02-
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// 2006-01-02T15:04:05Z07:00
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// 2006-01-02T15:04:05.999999999Z07:00
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// 2012-08-03 18:31:59.257000000
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// 2014-04-26 17:24:37.3186369
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// 2016-03-14 00:00:00.000
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// 2014-05-11 08:20:13,787
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// 2006-01-02
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// 2013-04-01 22:43:22
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// 2014-04-26 05:24:37 PM
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switch {
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case r == ' ':
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state = ST_DIGITDASHWS
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case r == 'T':
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state = ST_DIGITDASHT
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}
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case ST_DIGITDASHWS: // starts digit then dash 02- then whitespace
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// 2014-04-26 17:24:37.3186369
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// 2012-08-03 18:31:59.257000000
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// 2016-03-14 00:00:00.000
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// 2013-04-01 22:43:22
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// 2014-05-11 08:20:13,787
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// 2014-04-26 05:24:37 PM
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switch r {
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case 'A', 'P':
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if len(datestr) == len("2014-04-26 03:24:37 PM") {
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if t, err := time.Parse("2006-01-02 03:04:05 PM", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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}
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case ',':
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if len(datestr) == len("2014-05-11 08:20:13,787") {
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// go doesn't seem to parse this one natively? or did i miss it?
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if t, err := time.Parse("2006-01-02 03:04:05", datestr[:i]); err == nil {
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ms, err := strconv.Atoi(datestr[i+1:])
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if err == nil {
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return time.Unix(0, t.UnixNano()+int64(ms)*1e6), nil
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}
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return time.Time{}, err
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} else {
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return time.Time{}, err
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}
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}
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}
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case ST_DIGITDASHT: // starts digit then dash 02- then T
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// 2006-01-02T15:04:05Z07:00
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// 2006-01-02T15:04:05.999999999Z07:00
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if len(datestr) == len("2006-01-02T15:04:05Z07:00") {
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if t, err := time.Parse("2006-01-02T15:04:05Z07:00", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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} else if len(datestr) == len("2006-01-02T15:04:05.999999999Z07:00") {
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if t, err := time.Parse("2006-01-02T15:04:05.999999999Z07:00", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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}
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case ST_DIGITSLASH: // starts digit then slash 02/
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// 03/19/2012 10:11:59
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// 04/2/2014 03:00:37
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// 3/1/2012 10:11:59
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// 4/8/2014 22:05
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// 3/1/2014
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// 10/13/2014
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// 01/02/2006
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if unicode.IsDigit(r) || r == '/' {
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continue
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}
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switch r {
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case ' ':
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state = ST_DIGITSLASHWS
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}
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case ST_DIGITSLASHWS: // starts digit then slash 02/ more digits/slashes then whitespace
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// 03/19/2012 10:11:59
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// 04/2/2014 03:00:37
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// 3/1/2012 10:11:59
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// 4/8/2014 22:05
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switch r {
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case ':':
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state = ST_DIGITSLASHWSCOLON
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}
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case ST_DIGITSLASHWSCOLON: // starts digit then slash 02/ more digits/slashes then whitespace
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// 03/19/2012 10:11:59
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// 04/2/2014 03:00:37
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// 3/1/2012 10:11:59
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// 4/8/2014 22:05
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switch r {
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case ':':
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state = ST_DIGITSLASHWSCOLONCOLON
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}
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case ST_ALPHA: // starts alpha
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// May 8, 2009 5:57:51 PM
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// Mon Jan _2 15:04:05 2006
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// Mon Jan _2 15:04:05 MST 2006
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// Mon Jan 02 15:04:05 -0700 2006
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// Monday, 02-Jan-06 15:04:05 MST
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// Mon, 02 Jan 2006 15:04:05 MST
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// Mon, 02 Jan 2006 15:04:05 -0700
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if unicode.IsLetter(r) {
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continue
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}
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switch {
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case r == ' ':
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state = ST_ALPHAWS
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case r == ',':
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state = ST_ALPHACOMMA
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// case unicode.IsDigit(r):
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// state = ST_ALPHADIGIT
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}
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case ST_ALPHAWS: // Starts alpha then whitespace
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switch {
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// case r == ' ':
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// state = ST_ALPHAWSWS
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case r == ',':
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state = ST_ALPHAWSCOMMA
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case unicode.IsLetter(r):
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state = ST_ALPHAWSALPHA
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}
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case ST_ALPHACOMMA: // Starts alpha then comma
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// Mon, 02 Jan 2006 15:04:05 MST
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// Mon, 02 Jan 2006 15:04:05 -0700
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// Monday, 02-Jan-06 15:04:05 MST
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switch {
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case r == '-':
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state = ST_ALPHACOMMADASH
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}
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case ST_ALPHACOMMADASH: // Starts alpha then comma and one dash
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// Mon, 02 Jan 2006 15:04:05 -0700
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// Monday, 02-Jan-06 15:04:05 MST
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switch {
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case r == '-':
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state = ST_ALPHACOMMADASHDASH
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}
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case ST_ALPHAWSCOMMA: // Starts Alpha, whitespace, digit, comma
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// May 8, 2009 5:57:51 PM
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if t, err := time.Parse("Jan 2, 2006 3:04:05 PM", datestr); err == nil {
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return t, nil
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} else {
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//u.Error(err)
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}
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case ST_ALPHAWSALPHA: // Starts Alpha, whitespace, alpha
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// ANSIC = "Mon Jan _2 15:04:05 2006"
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// UnixDate = "Mon Jan _2 15:04:05 MST 2006"
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// RubyDate = "Mon Jan 02 15:04:05 -0700 2006"
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if len(datestr) == len("Mon Jan _2 15:04:05 2006") {
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if t, err := time.Parse(time.ANSIC, datestr); err == nil {
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return t, nil
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} else {
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//break iterRunes
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return time.Time{}, err
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}
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} else if len(datestr) == len("Mon Jan _2 15:04:05 MST 2006") {
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if t, err := time.Parse(time.UnixDate, datestr); err == nil {
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return t, nil
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} else {
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//break iterRunes
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return time.Time{}, err
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}
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} else if len(datestr) == len("Mon Jan 02 15:04:05 -0700 2006") {
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if t, err := time.Parse(time.RubyDate, datestr); err == nil {
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return t, nil
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} else {
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//break iterRunes
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return time.Time{}, err
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}
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}
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default:
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//u.Infof("no case for: %d", state)
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break iterRunes
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}
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}
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switch state {
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case ST_DIGIT:
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// unixy timestamps ish
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if len(datestr) >= len("13980450781991351") {
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if nanoSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
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return time.Unix(0, nanoSecs), nil
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} else {
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return time.Time{}, err
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}
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} else if len(datestr) >= len("13980450781991") {
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if microSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
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return time.Unix(0, microSecs*1000), nil
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} else {
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return time.Time{}, err
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}
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} else {
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if secs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
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return time.Unix(secs, 0), nil
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} else {
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return time.Time{}, err
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}
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}
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case ST_DIGITDASH: // starts digit then dash 02-
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// 2006-01-02
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if len(datestr) == len("2014-04-26") {
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if t, err := time.Parse("2006-01-02", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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}
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case ST_DIGITDASHWS: // starts digit then dash 02- then whitespace 1 << 2 << 5 + 3
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// 2014-04-26 17:24:37.3186369
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// 2012-08-03 18:31:59.257000000
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// 2016-03-14 00:00:00.000
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// 2013-04-01 22:43:22
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if len(datestr) == len("2012-08-03 18:31:59.257000000") {
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if t, err := time.Parse("2006-01-02 15:04:05.000000000", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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} else if len(datestr) == len("2014-04-26 05:24:37.3186369") {
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if t, err := time.Parse("2006-01-02 15:04:05.0000000", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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} else if len(datestr) == len("2014-04-26 05:24:37.000") {
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if t, err := time.Parse("2006-01-02 15:04:05.000", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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} else if len(datestr) == len("2013-04-01 22:43:22") {
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if t, err := time.Parse("2006-01-02 15:04:05", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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}
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case ST_DIGITSLASH: // starts digit then slash 02/ (but nothing else)
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// 3/1/2014
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// 10/13/2014
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// 01/02/2006
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if len(datestr) == len("01/02/2006") {
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if t, err := time.Parse("01/02/2006", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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} else {
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if t, err := time.Parse("1/2/2006", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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}
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case ST_DIGITSLASHWSCOLON: // starts digit then slash 02/ more digits/slashes then whitespace
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// 4/8/2014 22:05
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if len(datestr) == len("01/02/2006 15:04") {
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if t, err := time.Parse("01/02/2006 15:04", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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} else if len(datestr) == len("01/2/2006 15:04") {
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if t, err := time.Parse("01/2/2006 15:04", datestr); err == nil {
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return t, nil
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} else {
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if t, err := time.Parse("1/02/2006 15:04", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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}
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} else {
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if t, err := time.Parse("1/2/2006 15:04", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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}
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case ST_DIGITSLASHWSCOLONCOLON: // starts digit then slash 02/ more digits/slashes then whitespace double colons
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// 03/19/2012 10:11:59
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// 3/1/2012 10:11:59
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// 03/1/2012 10:11:59
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// 3/01/2012 10:11:59
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if len(datestr) == len("01/02/2006 15:04:05") {
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if t, err := time.Parse("01/02/2006 15:04:05", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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} else if len(datestr) == len("01/2/2006 15:04:05") {
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if t, err := time.Parse("01/2/2006 15:04:05", datestr); err == nil {
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return t, nil
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} else {
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if t, err := time.Parse("1/02/2006 15:04:05", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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}
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} else {
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if t, err := time.Parse("1/2/2006 15:04:05", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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}
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case ST_ALPHACOMMA: // Starts alpha then comma but no DASH
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// Mon, 02 Jan 2006 15:04:05 MST
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if t, err := time.Parse("Jan 2, 2006 3:04:05 PM", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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case ST_ALPHACOMMADASH: // Starts alpha then comma and one dash
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// Mon, 02 Jan 2006 15:04:05 -0700
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//RFC1123Z = "Mon, 02 Jan 2006 15:04:05 -0700" // RFC1123 with numeric zone
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// TODO: this doesn't work???
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if t, err := time.Parse(time.RFC1123Z, datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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case ST_ALPHACOMMADASHDASH: // Starts alpha then comma and two dash'es
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// Monday, 02-Jan-06 15:04:05 MST
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if t, err := time.Parse("Monday, 02-Jan-06 15:04:05 MST", datestr); err == nil {
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return t, nil
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} else {
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return time.Time{}, err
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}
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default:
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//u.Infof("no case for: %d : %s", state, datestr)
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}
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return time.Time{}, fmt.Errorf("Could not find date format for %s", datestr)
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}
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