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parse format refs #33

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This commit is contained in:
Aaron Raddon 2018-03-24 15:56:26 -07:00
parent f58c961370
commit d43304005d
2 changed files with 123 additions and 41 deletions
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116
parseany.go
View File

@ -90,7 +90,11 @@ var (
// ParseAny parse an unknown date format, detect the layout, parse.
// Normal parse. Equivalent Timezone rules as time.Parse()
func ParseAny(datestr string) (time.Time, error) {
return parseTime(datestr, nil)
p, err := parseTime(datestr, nil)
if err != nil {
return time.Time{}, err
}
return p.parse()
}
// ParseIn with Location, equivalent to time.ParseInLocation() timezone/offset
@ -99,7 +103,11 @@ func ParseAny(datestr string) (time.Time, error) {
// That is, MST means one thing when using America/Denver and something else
// in other locations.
func ParseIn(datestr string, loc *time.Location) (time.Time, error) {
return parseTime(datestr, loc)
p, err := parseTime(datestr, loc)
if err != nil {
return time.Time{}, err
}
return p.parse()
}
// ParseLocal Given an unknown date format, detect the layout,
@ -118,29 +126,44 @@ func ParseIn(datestr string, loc *time.Location) (time.Time, error) {
// t, err := dateparse.ParseIn("3/1/2014", denverLoc)
//
func ParseLocal(datestr string) (time.Time, error) {
return parseTime(datestr, time.Local)
p, err := parseTime(datestr, time.Local)
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) time.Time {
t, err := parseTime(datestr, nil)
p, err := parseTime(datestr, nil)
if err != nil {
panic(err.Error())
}
t, err := p.parse()
if err != nil {
panic(err.Error())
}
return t
}
func parse(layout, datestr string, loc *time.Location) (time.Time, error) {
if loc == nil {
return time.Parse(layout, datestr)
// ParseFormat parse an unknown date format, detect the layout and return layout.
func ParseFormat(datestr string) (string, error) {
p, err := parseTime(datestr, nil)
if err != nil {
return "", err
}
return time.ParseInLocation(layout, datestr, loc)
_, err = p.parse()
if err != nil {
return "", err
}
return string(p.format), nil
}
type parser struct {
loc *time.Location
preferMonthFirst bool
ambiguousMD bool
stateDate dateState
stateTime timeState
format []byte
@ -166,6 +189,7 @@ type parser struct {
offsetlen int
tzi int
tzlen int
t *time.Time
}
func newParser(dateStr string, loc *time.Location) *parser {
@ -283,6 +307,9 @@ func (p *parser) trimExtra() {
}
func (p *parser) parse() (time.Time, error) {
if p.t != nil {
return *p.t, nil
}
if p.skip > 0 && len(p.format) > p.skip {
p.format = p.format[p.skip:]
p.datestr = p.datestr[p.skip:]
@ -293,7 +320,7 @@ func (p *parser) parse() (time.Time, error) {
}
return time.ParseInLocation(string(p.format), p.datestr, p.loc)
}
func parseTime(datestr string, loc *time.Location) (time.Time, error) {
func parseTime(datestr string, loc *time.Location) (*parser, error) {
p := newParser(datestr, loc)
i := 0
@ -316,6 +343,8 @@ iterRunes:
p.stateDate = dateDigit
} else if unicode.IsLetter(r) {
p.stateDate = dateAlpha
} else {
return nil, fmt.Errorf("unrecognized first character '%s' in %v", string(r), datestr)
}
case dateDigit:
@ -341,6 +370,7 @@ iterRunes:
p.moi = i + 1
p.setYear()
} else {
p.ambiguousMD = true
if p.preferMonthFirst {
if p.molen == 0 {
p.molen = i
@ -352,6 +382,7 @@ iterRunes:
case '.':
// 3.31.2014
p.ambiguousMD = true
p.moi = 0
p.molen = i
p.setMonth()
@ -426,7 +457,6 @@ iterRunes:
// 2017-07-19 03:21:51+00:00
// 2013-04-01 22:43:22
// 2014-04-26 05:24:37 PM
switch r {
case ' ':
p.daylen = i - p.dayi
@ -487,11 +517,6 @@ iterRunes:
p.yeari = i + 1
}
}
default:
// if unicode.IsDigit(r) || r == '/' {
// continue
// }
}
case dateDigitWs:
@ -583,7 +608,6 @@ iterRunes:
// 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 == ' ':
if i > 4 {
@ -591,7 +615,8 @@ iterRunes:
// This one doesn't follow standard parse methodologies. the "January"
// is difficult to use the format string replace method because of its variable-length (march, june)
// so we just use this format here. If we see more similar to this we will do something else.
return parse("January 02, 2006 at 3:04pm MST-07", datestr, loc)
p.format = []byte("January 02, 2006 at 3:04pm MST-07")
return p, nil
}
p.stateDate = dateAlphaWs
case r == ',':
@ -609,7 +634,6 @@ iterRunes:
// the mon, monday, they are all superfelous and not needed
// just lay down the skip, no need to fill and then skip
}
}
case dateWeekdayComma:
// Monday, 02 Jan 2006 15:04:05 MST
@ -1242,9 +1266,11 @@ iterRunes:
t = time.Unix(0, miliSecs*1000*1000)
}
} else if len(datestr) == len("20140601") {
return parse("20060102", datestr, loc)
p.format = []byte("20060102")
return p, nil
} else if len(datestr) == len("2014") {
return parse("2006", datestr, loc)
p.format = []byte("2006")
return p, nil
}
if t.IsZero() {
if secs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
@ -1253,41 +1279,45 @@ iterRunes:
// nothing before unix-epoch
} else {
t = time.Unix(secs, 0)
p.t = &t
}
}
}
if !t.IsZero() {
if loc == nil {
return t, nil
p.t = &t
return p, nil
}
return t.In(loc), nil
t = t.In(loc)
p.t = &t
return p, nil
}
case dateDigitDash:
// 2006-01
return p.parse()
return p, nil
case dateDigitDashDash:
// 2006-01-02
// 2006-1-02
// 2006-1-2
// 2006-01-2
return p.parse()
return p, nil
case dateDigitDashDashAlpha:
// 2013-Feb-03
// 2013-Feb-3
p.daylen = i - p.dayi
p.setDay()
return p.parse()
return p, nil
case dateDigitDashDashWs: // starts digit then dash 02- then whitespace 1 << 2 << 5 + 3
// 2013-04-01 22:43:22
// 2013-04-01 22:43
return p.parse()
return p, nil
case dateDigitDashDashT:
return p.parse()
return p, nil
case dateDigitDotDot:
// 03.31.1981
@ -1295,7 +1325,7 @@ iterRunes:
// 3.2.81
p.setYear()
p.yearlen = i - p.yeari
return p.parse()
return p, nil
case dateDigitWsMoYear:
// 2 Jan 2018
@ -1305,59 +1335,63 @@ iterRunes:
// 02 Jan 2018 23:59:45
// 12 Feb 2006, 19:17
// 12 Feb 2006, 19:17:22
return p.parse()
return p, nil
case dateDigitWsMolong:
// 18 January 2018
// 8 January 2018
if p.daylen == 2 {
return parse("02 January 2006", datestr, loc)
p.format = []byte("02 January 2006")
return p, nil
}
return parse("2 January 2006", datestr, loc)
p.format = []byte("2 January 2006")
return p, nil // parse("2 January 2006", datestr, loc)
case dateAlphaWsDigitCommaWs:
// oct 1, 1970
p.yearlen = i - p.yeari
p.setYear()
return p.parse()
return p, nil
case dateAlphaWsDigitCommaWsYear:
// May 8, 2009 5:57:51 PM
return p.parse()
return p, nil
case dateAlphaWsAlpha:
return p.parse()
return p, nil
case dateAlphaWsAlphaYearmaybe:
return p.parse()
return p, nil
case dateDigitSlash:
// 3/1/2014
// 10/13/2014
// 01/02/2006
// 2014/10/13
return p.parse()
return p, nil
case dateDigitChineseYear:
// dateDigitChineseYear
// 2014年04月08日
return parse("2006年01月02日", datestr, loc)
p.format = []byte("2006年01月02日")
return p, nil
case dateDigitChineseYearWs:
return parse("2006年01月02日 15:04:05", datestr, loc)
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.parse()
return p, nil
case dateWeekdayAbbrevComma:
// Mon, 02-Jan-06 15:04:05 MST
// Mon, 02 Jan 2006 15:04:05 MST
return p.parse()
return p, nil
}
return time.Time{}, fmt.Errorf("Could not find date format for %s", datestr)
return nil, fmt.Errorf("Could not find date format for %s", datestr)
}

48
parseany_test.go
View File

@ -111,6 +111,16 @@ func TestInLocation(t *testing.T) {
_, offset = ts.Zone()
assert.NotEqual(t, 0, offset, "Should have found offset %v", offset)
assert.Equal(t, "2006-01-02 22:04:05 +0000 UTC", fmt.Sprintf("%v", ts.In(time.UTC)))
// Now some errors
zeroTime := time.Time{}.Unix()
ts, err = ParseIn("INVALID", denverLoc)
assert.Equal(t, zeroTime, ts.Unix())
assert.NotEqual(t, nil, err)
ts, err = ParseLocal("INVALID")
assert.Equal(t, zeroTime, ts.Unix())
assert.NotEqual(t, nil, err)
}
func TestOne(t *testing.T) {
@ -461,6 +471,8 @@ func TestParse(t *testing.T) {
// some errors
assert.Equal(t, true, testDidPanic(`{"ts":"now"}`))
_, err = ParseAny("138421636711122233311111") // too many digits
assert.NotEqual(t, nil, err)
@ -499,3 +511,39 @@ func TestPStruct(t *testing.T) {
assert.True(t, len(p.ds()) > 0)
assert.True(t, len(p.ts()) > 0)
}
var testParseFormat = []dateTest{
{in: "oct 7, 1970", out: "Jan 2, 2006"},
// 03 February 2013
{in: "03 February 2013", out: "02 January 2006"},
// 13:31:51.999 -07:00 MST
// yyyy-mm-dd hh:mm:ss +00:00
{in: "2012-08-03 18:31:59 +00:00", out: "2006-01-02 15:04:05 -07:00"},
// yyyy-mm-dd hh:mm:ss +0000 TZ
// Golang Native Format
{in: "2012-08-03 18:31:59 +0000 UTC", out: "2006-01-02 15:04:05 -0700 UTC"},
// yyyy-mm-dd hh:mm:ss TZ
{in: "2012-08-03 18:31:59 UTC", out: "2006-01-02 15:04:05 UTC"},
// yyyy-mm-ddThh:mm:ss-07:00
{in: "2009-08-12T22:15:09-07:00", out: "2006-01-02T15:04:05-07:00"},
// yyyy-mm-ddThh:mm:ss-0700
{in: "2009-08-12T22:15:09-0700", out: "2006-01-02T15:04:05-0700"},
// yyyy-mm-ddThh:mm:ssZ
{in: "2009-08-12T22:15Z", out: "2006-01-02T15:04Z"},
}
func TestParseLayout(t *testing.T) {
for _, th := range testParseFormat {
l, err := ParseFormat(th.in)
assert.Equal(t, nil, err)
assert.Equal(t, th.out, l, "for in=%v", th.in)
}
// errors
_, err := ParseFormat(`{"hello"}`)
assert.NotEqual(t, nil, err)
_, err = ParseFormat("2009-15-12T22:15Z")
assert.NotEqual(t, nil, err)
}