mirror of
https://github.com/araddon/dateparse.git
synced 2024-11-10 11:51:54 +08:00
279 lines
6.7 KiB
Go
279 lines
6.7 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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const (
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ST_START uint64 = 1
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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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var state uint64 = 1
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iterRunes:
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for i := 0; i < len(datestr); i++ {
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r, _ := utf8.DecodeRuneInString(datestr[i:])
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//u.Infof("r=%s st=%d ", string(r), state)
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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 = state << 1 // 2
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} else if unicode.IsLetter(r) {
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state = state << 2 // 4
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}
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case 2: // starts digit 1 << 2
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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 = state << 3
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case ',':
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state = state << 4
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case '-':
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state = state << 5
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case ':':
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state = state << 6
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case '/':
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state = state << 7
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}
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case 64: // starts digit then dash 02- 1 << 2 << 5
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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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// 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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// 2014-04-26 05:24:37 PM
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switch {
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case r == ' ':
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state = state + 1
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case r == 'T':
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state = state + 3
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}
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case 65: // starts digit then dash 02- then whitespace 1 << 2 << 5 + 1
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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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// 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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u.Error(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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u.Error(err)
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} else {
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u.Error(err)
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}
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}
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}
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case 67: // starts digit then dash 02- then T 1 << 2 << 5 + 3
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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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u.Error(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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u.Error(err)
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}
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}
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case 256: // starts digit then slash 02/
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// 03/19/2012 10:11:59
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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 = state << 3
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}
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case 2048: // starts digit then slash 02/ more digits/slashes then whitespace
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// 03/19/2012 10:11:59
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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 = state << 8
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}
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case 524288: // starts digit then slash 02/ more digits/slashes then whitespace
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// 03/19/2012 10:11:59
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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 = state << 9
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}
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case 4: // starts alpha 1 << 2
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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 = state << 3
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case r == ',':
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state = state << 4
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case unicode.IsDigit(r):
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state = state << 5
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}
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case 32: // Starts alpha then whitespace 1 << 2 << 3
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switch {
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case r == ' ':
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state = state << 6
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case r == ',':
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state = state << 7
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case unicode.IsDigit(r):
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state = state << 8
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case unicode.IsLetter(r):
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state = state << 9
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}
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case 8192: // Starts Alpha then whitespace then digit 1 << 2 << 8
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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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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 2:
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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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u.Error(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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u.Error(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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u.Error(err)
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}
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}
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case 64: // starts digit then dash 02- 1 << 2 << 5
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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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u.Error(err)
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}
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}
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case 65: // 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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// 2016-03-14 00:00:00.000
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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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u.Error(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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u.Error(err)
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}
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}
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case 256: // starts digit then slash 02/
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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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u.Error(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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u.Error(err)
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}
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}
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case 524288: // 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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u.Error(err)
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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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u.Error(err)
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}
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}
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case 268435456: // 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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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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u.Error(err)
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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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u.Error(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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}
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return time.Now(), fmt.Errorf("Could not find date format for %s", datestr)
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}
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