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clean up handling of numeric time zones
allow formatting of ruby-style times. Fixes #518. R=rsc CC=golang-dev https://golang.org/cl/186119
This commit is contained in:
Rob Pike
parent
e8afb6d87f
commit
d9283b27a2
@ -11,6 +11,8 @@ const (
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numeric = iota
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alphabetic
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separator
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plus
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minus
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)
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// These are predefined layouts for use in Time.Format.
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@ -25,6 +27,7 @@ const (
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const (
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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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RFC850 = "Monday, 02-Jan-06 15:04:05 MST"
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RFC1123 = "Mon, 02 Jan 2006 15:04:05 MST"
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Kitchen = "3:04PM"
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@ -56,7 +59,8 @@ const (
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stdPM = "PM"
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stdpm = "pm"
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stdTZ = "MST"
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stdISO8601TZ = "Z"
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stdISO8601TZ = "Z" // prints Z for UTC
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stdNumTZ = "0700" // always numeric
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)
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var longDayNames = []string{
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@ -126,8 +130,12 @@ func charType(c uint8) int {
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return numeric
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case c == '_': // underscore; treated like a number when printing
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return numeric
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case 'a' <= c && c < 'z', 'A' <= c && c <= 'Z':
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case 'a' <= c && c <= 'z', 'A' <= c && c <= 'Z':
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return alphabetic
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case c == '+':
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return plus
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case c == '-':
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return minus
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}
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return separator
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}
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@ -198,19 +206,31 @@ func (t *Time) Format(layout string) string {
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p = zeroPad(t.Second)
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case stdZulu:
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p = zeroPad(t.Hour) + zeroPad(t.Minute)
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case stdISO8601TZ:
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// Rather ugly special case, required because the time zone is too broken down
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// in this format to recognize easily. We cheat and take "Z" to mean "the time
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case stdISO8601TZ, stdNumTZ:
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// Ugly special case. We cheat and take "Z" to mean "the time
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// zone as formatted for ISO 8601".
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if t.ZoneOffset == 0 {
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zone := t.ZoneOffset / 60 // conver to minutes
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if p == stdISO8601TZ && t.ZoneOffset == 0 {
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p = "Z"
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} else {
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zone := t.ZoneOffset / 60 // minutes
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if zone < 0 {
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p = "-"
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zone = -zone
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// If the reference time is stdNumTZ (0700), the sign has already been
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// emitted but may be wrong. For stdISO8601TZ we must print it.
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if p == stdNumTZ && b.Len() > 0 {
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soFar := b.Bytes()
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if soFar[len(soFar)-1] == '-' && zone >= 0 {
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// fix the sign
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soFar[len(soFar)-1] = '+'
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} else {
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zone = -zone
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}
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p = ""
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} else {
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p = "+"
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if zone < 0 {
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p = "-"
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zone = -zone
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} else {
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p = "+"
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}
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}
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p += zeroPad(zone / 60)
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p += zeroPad(zone % 60)
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@ -294,8 +314,8 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
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rangeErrString := "" // set if a value is out of range
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pmSet := false // do we need to add 12 to the hour?
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// Each iteration steps along one piece
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nextIsYear := false // whether next item is a Year; means we saw a minus sign.
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layout, value := alayout, avalue
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sign := "" // pending + or - from previous iteration
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for len(layout) > 0 && len(value) > 0 {
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c := layout[0]
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pieceType := charType(c)
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@ -303,10 +323,12 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
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for i = 0; i < len(layout) && charType(layout[i]) == pieceType; i++ {
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}
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reference := layout[0:i]
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prevLayout := layout
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layout = layout[i:]
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if reference == "Z" {
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// Ugly time zone handling.
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if reference == "Z" || reference == "z" {
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// Special case for ISO8601 time zone: "Z" or "-0800"
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if value[0] == 'Z' {
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if reference == "Z" && value[0] == 'Z' {
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i = 1
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} else if len(value) >= 5 {
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i = 5
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@ -316,6 +338,13 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
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} else {
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c = value[0]
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if charType(c) != pieceType {
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// could be a minus sign introducing a negative year
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if c == '-' && pieceType != minus {
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value = value[1:]
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sign = "-"
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layout = prevLayout // don't consume reference item
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continue
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}
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return nil, &ParseError{Layout: alayout, Value: avalue, Message: formatErr + alayout}
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}
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for i = 0; i < len(value) && charType(value[i]) == pieceType; i++ {
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@ -323,21 +352,17 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
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}
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p := value[0:i]
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value = value[i:]
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// Separators must match but:
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// - initial run of spaces is treated as a single space
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// - there could be a following minus sign for negative years
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if pieceType == separator {
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if len(p) != len(reference) {
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// must be exactly a following minus sign
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pp := collapseSpaces(p)
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rr := collapseSpaces(reference)
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if pp != rr {
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if len(pp) != len(rr)+1 || p[len(pp)-1] != '-' {
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return nil, &ParseError{Layout: alayout, Value: avalue, Message: formatErr + alayout}
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}
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nextIsYear = true
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continue
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}
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switch pieceType {
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case separator:
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// Separators must match but initial run of spaces is treated as a single space.
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if collapseSpaces(p) != collapseSpaces(reference) {
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return nil, &ParseError{Layout: alayout, Value: avalue, Message: formatErr + alayout}
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}
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continue
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case plus, minus:
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if len(p) == 1 { // ++ or -- don't count as signs.
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sign = p
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continue
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}
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}
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var err os.Error
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@ -351,9 +376,8 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
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}
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case stdLongYear:
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t.Year, err = strconv.Atoi64(p)
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if nextIsYear {
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if sign == "-" {
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t.Year = -t.Year
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nextIsYear = false
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}
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case stdMonth:
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t.Month, err = lookup(shortMonthNames, p)
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@ -403,19 +427,25 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
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if err != nil {
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t.Minute, err = strconv.Atoi(p[2:4])
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}
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case stdISO8601TZ:
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if p == "Z" {
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t.Zone = "UTC"
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break
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case stdISO8601TZ, stdNumTZ:
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if reference == stdISO8601TZ {
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if p == "Z" {
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t.Zone = "UTC"
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break
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}
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// len(p) known to be 5: "-0800"
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sign = p[0:1]
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p = p[1:]
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} else {
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// len(p) known to be 4: "0800" and sign is set
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}
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// len(p) known to be 5: "-0800"
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var hr, min int
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hr, err = strconv.Atoi(p[1:3])
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hr, err = strconv.Atoi(p[0:2])
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if err != nil {
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min, err = strconv.Atoi(p[3:5])
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min, err = strconv.Atoi(p[2:4])
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}
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t.ZoneOffset = (hr*60 + min) * 60 // offset is in seconds
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switch p[0] {
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switch sign[0] {
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case '+':
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case '-':
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t.ZoneOffset = -t.ZoneOffset
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@ -463,16 +493,13 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
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}
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}
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}
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if nextIsYear {
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// Means we didn't see a year when we were expecting one
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return nil, &ParseError{Layout: alayout, Value: value, Message: formatErr + alayout}
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}
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if rangeErrString != "" {
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return nil, &ParseError{alayout, avalue, reference, p, ": " + rangeErrString + " out of range"}
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}
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if err != nil {
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return nil, &ParseError{alayout, avalue, reference, p, ""}
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}
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sign = ""
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}
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if pmSet && t.Hour < 12 {
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t.Hour += 12
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@ -132,6 +132,7 @@ type FormatTest struct {
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var formatTests = []FormatTest{
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FormatTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010"},
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FormatTest{"UnixDate", UnixDate, "Thu Feb 4 21:00:57 PST 2010"},
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FormatTest{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 -0800 2010"},
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FormatTest{"RFC850", RFC850, "Thursday, 04-Feb-10 21:00:57 PST"},
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FormatTest{"RFC1123", RFC1123, "Thu, 04 Feb 2010 21:00:57 PST"},
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FormatTest{"ISO8601", ISO8601, "2010-02-04T21:00:57-0800"},
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@ -152,22 +153,26 @@ func TestFormat(t *testing.T) {
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}
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type ParseTest struct {
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name string
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format string
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value string
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hasTZ bool // contains a time zone
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hasWD bool // contains a weekday
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name string
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format string
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value string
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hasTZ bool // contains a time zone
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hasWD bool // contains a weekday
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yearSign int64 // sign of year
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}
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var parseTests = []ParseTest{
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ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true},
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ParseTest{"UnixDate", UnixDate, "Thu Feb 4 21:00:57 PST 2010", true, true},
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ParseTest{"RFC850", RFC850, "Thursday, 04-Feb-10 21:00:57 PST", true, true},
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ParseTest{"RFC1123", RFC1123, "Thu, 04 Feb 2010 21:00:57 PST", true, true},
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ParseTest{"ISO8601", ISO8601, "2010-02-04T21:00:57-0800", true, false},
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ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true, 1},
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ParseTest{"UnixDate", UnixDate, "Thu Feb 4 21:00:57 PST 2010", true, true, 1},
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ParseTest{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 -0800 2010", true, true, 1},
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ParseTest{"RFC850", RFC850, "Thursday, 04-Feb-10 21:00:57 PST", true, true, 1},
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ParseTest{"RFC1123", RFC1123, "Thu, 04 Feb 2010 21:00:57 PST", true, true, 1},
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ParseTest{"ISO8601", ISO8601, "2010-02-04T21:00:57-0800", true, false, 1},
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// Negative year
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ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 -2010", false, true, -1},
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// Amount of white space should not matter.
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ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true},
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ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true},
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ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true, 1},
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ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true, 1},
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}
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func TestParse(t *testing.T) {
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@ -183,7 +188,7 @@ func TestParse(t *testing.T) {
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func checkTime(time *Time, test *ParseTest, t *testing.T) {
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// The time should be Thu Feb 4 21:00:57 PST 2010
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if time.Year != 2010 {
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if test.yearSign*time.Year != 2010 {
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t.Errorf("%s: bad year: %d not %d\n", test.name, time.Year, 2010)
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}
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if time.Month != 2 {
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