mirror of
https://github.com/golang/go
synced 2024-11-25 05:57:57 -07:00
time: do not segment time strings by character class.
instead use pure substring matching to find template values. this makes stdZulu unnecessary and allows formats like "20060102 030405" (used in some internet protocols). this makes Parse not handle years < 0000 or > 9999 anymore. that seems like an okay price to pay, trading hypothetical functionality for real functionality. also changed the comments on the Time struct to use the same reference date as the format and parse routines. R=r CC=golang-dev https://golang.org/cl/833045
This commit is contained in:
Russ Cox
parent
8fbe8bee6c
commit
78547ca132
@ -58,14 +58,83 @@ const (
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stdZeroSecond = "05"
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stdLongYear = "2006"
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stdYear = "06"
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stdZulu = "1504"
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stdPM = "PM"
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stdpm = "pm"
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stdTZ = "MST"
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stdISO8601TZ = "Z" // prints Z for UTC
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stdNumTZ = "0700" // always numeric
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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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// nextStdChunk finds the first occurrence of a std string in
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// layout and returns the text before, the std string, and the text after.
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func nextStdChunk(layout string) (prefix, std, suffix string) {
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for i := 0; i < len(layout); i++ {
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switch layout[i] {
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case 'J': // January, Jan
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if len(layout) >= i+7 && layout[i:i+7] == stdLongMonth {
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return layout[0:i], stdLongMonth, layout[i+7:]
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}
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if len(layout) >= i+3 && layout[i:i+3] == stdMonth {
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return layout[0:i], stdMonth, layout[i+3:]
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}
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case 'M': // Monday, Mon, MST
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if len(layout) >= i+6 && layout[i:i+6] == stdLongWeekDay {
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return layout[0:i], stdLongWeekDay, layout[i+6:]
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}
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if len(layout) >= i+3 {
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if layout[i:i+3] == stdWeekDay {
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return layout[0:i], stdWeekDay, layout[i+3:]
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}
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if layout[i:i+3] == stdTZ {
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return layout[0:i], stdTZ, layout[i+3:]
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}
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}
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case '0': // 01, 02, 03, 04, 05, 06
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if len(layout) >= i+2 && '1' <= layout[i+1] && layout[i+1] <= '6' {
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return layout[0:i], layout[i : i+2], layout[i+2:]
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}
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case '1': // 15, 1
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if len(layout) >= i+2 && layout[i+1] == '5' {
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return layout[0:i], stdHour, layout[i+2:]
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}
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return layout[0:i], stdNumMonth, layout[i+1:]
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case '2': // 2006, 2
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if len(layout) >= i+4 && layout[i:i+4] == stdLongYear {
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return layout[0:i], stdLongYear, layout[i+4:]
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}
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return layout[0:i], stdDay, layout[i+1:]
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case '_': // _2
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if len(layout) >= i+2 && layout[i+1] == '2' {
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return layout[0:i], stdUnderDay, layout[i+2:]
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}
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case '3', '4', '5', 'Z': // 3, 4, 5, Z
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return layout[0:i], layout[i : i+1], layout[i+1:]
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case 'P': // PM
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if len(layout) >= i+2 && layout[i+1] == 'M' {
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return layout[0:i], layout[i : i+2], layout[i+2:]
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}
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case 'p': // pm
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if len(layout) >= i+2 && layout[i+1] == 'm' {
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return layout[0:i], layout[i : i+2], layout[i+2:]
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}
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case '-': // -0700
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if len(layout) >= i+5 && layout[i:i+5] == stdNumTZ {
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return layout[0:i], layout[i : i+5], layout[i+5:]
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}
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}
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}
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return layout, "", ""
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}
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var longDayNames = []string{
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"Sunday",
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"Monday",
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@ -118,29 +187,13 @@ var longMonthNames = []string{
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"December",
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}
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func lookup(tab []string, val string) (int, os.Error) {
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func lookup(tab []string, val string) (int, string, os.Error) {
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for i, v := range tab {
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if v == val {
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return i, nil
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if len(val) >= len(v) && val[0:len(v)] == v {
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return i, val[len(v):], nil
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}
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}
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return -1, errBad
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}
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func charType(c uint8) int {
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switch {
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case '0' <= c && c <= '9':
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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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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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return -1, val, errBad
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}
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func pad(i int, padding string) string {
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@ -160,17 +213,15 @@ func zeroPad(i int) string { return pad(i, "0") }
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// ISO8601 and others describe standard representations.
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func (t *Time) Format(layout string) string {
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b := new(bytes.Buffer)
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// Each iteration generates one piece
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for len(layout) > 0 {
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c := layout[0]
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pieceType := charType(c)
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i := 0
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for i < len(layout) && charType(layout[i]) == pieceType {
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i++
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// Each iteration generates one std value.
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for {
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prefix, std, suffix := nextStdChunk(layout)
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b.WriteString(prefix)
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if std == "" {
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break
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}
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p := layout[0:i]
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layout = layout[i:]
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switch p {
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var p string
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switch std {
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case stdYear:
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p = strconv.Itoa64(t.Year % 100)
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case stdLongYear:
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@ -207,37 +258,22 @@ func (t *Time) Format(layout string) string {
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p = strconv.Itoa(t.Second)
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case stdZeroSecond:
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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, 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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zone := t.ZoneOffset / 60 // convert to minutes
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if p == stdISO8601TZ && t.ZoneOffset == 0 {
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if std == stdISO8601TZ && t.ZoneOffset == 0 {
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p = "Z"
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} else {
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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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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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break
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}
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zone := t.ZoneOffset / 60 // convert to minutes
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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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p += zeroPad(zone / 60)
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p += zeroPad(zone % 60)
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case stdPM:
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if t.Hour >= 12 {
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p = "PM"
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@ -268,6 +304,7 @@ func (t *Time) Format(layout string) string {
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}
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}
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b.WriteString(p)
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layout = suffix
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}
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return b.String()
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}
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@ -299,20 +336,49 @@ func (e *ParseError) String() string {
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strconv.Quote(e.Value) + e.Message
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}
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// To simplify comparison, collapse an initial run of spaces into a single space.
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func collapseSpaces(s string) string {
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if len(s) <= 1 || s[0] != ' ' {
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return s
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// getnum parses s[0:1] or s[0:2] (fixed forces the latter)
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// as a decimal integer and returns the integer and the
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// remainder of the string.
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func getnum(s string, fixed bool) (int, string, os.Error) {
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if len(s) == 0 || s[0] < '0' || s[0] > '9' {
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return 0, s, errBad
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}
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var i int
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for i = 1; i < len(s); i++ {
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if s[i] != ' ' {
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return s[i-1:]
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if len(s) == 1 || s[1] < '0' || s[1] > '9' {
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if fixed {
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return 0, s, errBad
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}
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return int(s[0] - '0'), s[1:], nil
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}
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return " "
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return int(s[0]-'0')*10 + int(s[1]-'0'), s[2:], nil
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}
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func cutspace(s string) string {
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for len(s) > 0 && s[0] == ' ' {
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s = s[1:]
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}
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return s
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}
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// skip removes the given prefix from value,
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// treating runs of space characters as equivalent.
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func skip(value, prefix string) (string, os.Error) {
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for len(prefix) > 0 {
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if prefix[0] == ' ' {
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if len(value) > 0 && value[0] != ' ' {
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return "", errBad
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}
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prefix = cutspace(prefix)
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value = cutspace(value)
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continue
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}
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if len(value) == 0 || value[0] != prefix[0] {
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return "", errBad
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}
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prefix = prefix[1:]
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value = value[1:]
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}
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return value, nil
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}
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// Parse parses a formatted string and returns the time value it represents.
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// The layout defines the format by showing the representation of a standard
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@ -325,74 +391,35 @@ func collapseSpaces(s string) string {
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// (such as having the wrong day of the week), the returned value will also
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// be inconsistent. In any case, the elements of the returned time will be
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// sane: hours in 0..23, minutes in 0..59, day of month in 0..31, etc.
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// Years must be in the range 0000..9999.
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func Parse(alayout, avalue string) (*Time, os.Error) {
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var t Time
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const formatErr = ": different format from "
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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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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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var i int
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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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// Ugly time zone handling.
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if 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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i = 1
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} else if len(value) >= 5 {
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i = 5
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} else {
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return nil, &ParseError{Layout: alayout, Value: avalue, Message: formatErr + alayout}
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}
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} else {
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c = value[0]
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if charType(c) != pieceType {
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// Ugly management of signs. Reference and data might differ.
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// 1. 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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layout = prevLayout // don't consume reference item
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sign = "-"
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continue
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}
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// 2. Could be a plus sign for a +0100 time zone, represented by -0700 in the standard.
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if c == '+' && pieceType == minus {
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value = value[1:]
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layout = prevLayout[1:] // absorb sign in both value and layout
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sign = "+"
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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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}
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}
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p := value[0:i]
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value = value[i:]
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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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// Each iteration processes one std value.
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for {
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var err os.Error
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switch reference {
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prefix, std, suffix := nextStdChunk(layout)
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value, err = skip(value, prefix)
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if err != nil {
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return nil, &ParseError{alayout, avalue, prefix, value, ""}
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}
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if len(std) == 0 {
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if len(value) != 0 {
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return nil, &ParseError{alayout, avalue, "", value, ": extra text: " + value}
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}
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break
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}
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layout = suffix
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var p string
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switch std {
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case stdYear:
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if len(value) < 2 {
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err = errBad
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break
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}
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p, value = value[0:2], value[2:]
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t.Year, err = strconv.Atoi64(p)
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if t.Year >= 69 { // Unix time starts Dec 31 1969 in some time zones
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t.Year += 1900
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@ -400,70 +427,66 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
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t.Year += 2000
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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 sign == "-" {
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t.Year = -t.Year
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if len(value) < 4 || value[0] < '0' || value[0] > '9' {
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err = errBad
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break
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}
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p, value = value[0:4], value[4:]
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t.Year, err = strconv.Atoi64(p)
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case stdMonth:
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t.Month, err = lookup(shortMonthNames, p)
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t.Month, value, err = lookup(shortMonthNames, value)
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case stdLongMonth:
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t.Month, err = lookup(longMonthNames, p)
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t.Month, value, err = lookup(longMonthNames, value)
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case stdNumMonth, stdZeroMonth:
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t.Month, err = strconv.Atoi(p)
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t.Month, value, err = getnum(value, std == stdZeroMonth)
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if t.Month <= 0 || 12 < t.Month {
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rangeErrString = "month"
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}
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case stdWeekDay:
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t.Weekday, err = lookup(shortDayNames, p)
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t.Weekday, value, err = lookup(shortDayNames, value)
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case stdLongWeekDay:
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t.Weekday, err = lookup(longDayNames, p)
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t.Weekday, value, err = lookup(longDayNames, value)
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case stdDay, stdUnderDay, stdZeroDay:
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t.Day, err = strconv.Atoi(p)
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if std == stdUnderDay && len(value) > 0 && value[0] == ' ' {
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value = value[1:]
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}
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t.Day, value, err = getnum(value, std == stdZeroDay)
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if t.Day < 0 || 31 < t.Day {
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// TODO: be more thorough in date check?
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rangeErrString = "day"
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}
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case stdHour:
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t.Hour, err = strconv.Atoi(p)
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t.Hour, value, err = getnum(value, false)
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if t.Hour < 0 || 24 <= t.Hour {
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rangeErrString = "hour"
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}
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case stdHour12, stdZeroHour12:
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t.Hour, err = strconv.Atoi(p)
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t.Hour, value, err = getnum(value, std == stdZeroHour12)
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if t.Hour < 0 || 12 < t.Hour {
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rangeErrString = "hour"
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}
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case stdMinute, stdZeroMinute:
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t.Minute, err = strconv.Atoi(p)
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t.Minute, value, err = getnum(value, std == stdZeroMinute)
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if t.Minute < 0 || 60 <= t.Minute {
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rangeErrString = "minute"
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}
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case stdSecond, stdZeroSecond:
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t.Second, err = strconv.Atoi(p)
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t.Second, value, err = getnum(value, std == stdZeroSecond)
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if t.Second < 0 || 60 <= t.Second {
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rangeErrString = "second"
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}
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case stdZulu:
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if len(p) != 4 {
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err = os.ErrorString("HHMM value must be 4 digits")
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case stdISO8601TZ, stdNumTZ:
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if std == stdISO8601TZ && len(value) >= 1 && value[0] == 'Z' {
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value = value[1:]
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t.Zone = "UTC"
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break
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}
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t.Hour, err = strconv.Atoi(p[0:2])
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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, 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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if len(value) < 5 {
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err = errBad
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break
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}
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var sign string
|
||||
sign, p, value = value[0:1], value[1:5], value[5:]
|
||||
var hr, min int
|
||||
hr, err = strconv.Atoi(p[0:2])
|
||||
if err != nil {
|
||||
@ -478,12 +501,22 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
|
||||
err = errBad
|
||||
}
|
||||
case stdPM:
|
||||
if len(value) < 2 {
|
||||
err = errBad
|
||||
break
|
||||
}
|
||||
p, value = value[0:2], value[2:]
|
||||
if p == "PM" {
|
||||
pmSet = true
|
||||
} else if p != "AM" {
|
||||
err = errBad
|
||||
}
|
||||
case stdpm:
|
||||
if len(value) < 2 {
|
||||
err = errBad
|
||||
break
|
||||
}
|
||||
p, value = value[0:2], value[2:]
|
||||
if p == "pm" {
|
||||
pmSet = true
|
||||
} else if p != "am" {
|
||||
@ -491,13 +524,18 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
|
||||
}
|
||||
case stdTZ:
|
||||
// Does it look like a time zone?
|
||||
if p == "UTC" {
|
||||
t.Zone = p
|
||||
if len(value) >= 3 && value[0:3] == "UTC" {
|
||||
t.Zone, value = value[0:3], value[3:]
|
||||
break
|
||||
}
|
||||
// All other time zones look like XXT or XXXT.
|
||||
if len(p) != 3 && len(p) != 4 || p[len(p)-1] != 'T' {
|
||||
|
||||
if len(value) >= 3 && value[2] == 'T' {
|
||||
p, value = value[0:3], value[3:]
|
||||
} else if len(value) >= 4 && value[3] == 'T' {
|
||||
p, value = value[0:4], value[4:]
|
||||
} else {
|
||||
err = errBad
|
||||
break
|
||||
}
|
||||
for i := 0; i < len(p); i++ {
|
||||
if p[i] < 'A' || 'Z' < p[i] {
|
||||
@ -519,12 +557,11 @@ func Parse(alayout, avalue string) (*Time, os.Error) {
|
||||
}
|
||||
}
|
||||
if rangeErrString != "" {
|
||||
return nil, &ParseError{alayout, avalue, reference, p, ": " + rangeErrString + " out of range"}
|
||||
return nil, &ParseError{alayout, avalue, std, value, ": " + rangeErrString + " out of range"}
|
||||
}
|
||||
if err != nil {
|
||||
return nil, &ParseError{alayout, avalue, reference, p, ""}
|
||||
return nil, &ParseError{alayout, avalue, std, value, ""}
|
||||
}
|
||||
sign = ""
|
||||
}
|
||||
if pmSet && t.Hour < 12 {
|
||||
t.Hour += 12
|
||||
|
||||
@ -43,12 +43,12 @@ const (
|
||||
|
||||
// Time is the struct representing a parsed time value.
|
||||
type Time struct {
|
||||
Year int64 // 2008 is 2008
|
||||
Month, Day int // Sep-17 is 9, 17
|
||||
Hour, Minute, Second int // 10:43:12 is 10, 43, 12
|
||||
Weekday int // Sunday, Monday, ...
|
||||
ZoneOffset int // seconds east of UTC
|
||||
Zone string
|
||||
Year int64 // 2006 is 2006
|
||||
Month, Day int // Jan-2 is 1, 2
|
||||
Hour, Minute, Second int // 15:04:05 is 15, 4, 5.
|
||||
Weekday int // Sunday, Monday, ...
|
||||
ZoneOffset int // seconds east of UTC, e.g. -7*60 for -0700
|
||||
Zone string // e.g., "MST"
|
||||
}
|
||||
|
||||
var nonleapyear = []int{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
|
||||
|
||||
@ -169,8 +169,6 @@ var parseTests = []ParseTest{
|
||||
ParseTest{"RFC850", RFC850, "Thursday, 04-Feb-10 21:00:57 PST", true, true, 1},
|
||||
ParseTest{"RFC1123", RFC1123, "Thu, 04 Feb 2010 21:00:57 PST", true, true, 1},
|
||||
ParseTest{"ISO8601", ISO8601, "2010-02-04T21:00:57-0800", true, false, 1},
|
||||
// Negative year
|
||||
ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 -2010", false, true, -1},
|
||||
// Amount of white space should not matter.
|
||||
ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true, 1},
|
||||
ParseTest{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true, 1},
|
||||
@ -239,6 +237,10 @@ func TestFormatAndParse(t *testing.T) {
|
||||
const fmt = "Mon MST " + ISO8601 // all fields
|
||||
f := func(sec int64) bool {
|
||||
t1 := SecondsToLocalTime(sec)
|
||||
if t1.Year < 1000 || t1.Year > 9999 {
|
||||
// not required to work
|
||||
return true
|
||||
}
|
||||
t2, err := Parse(fmt, t1.Format(fmt))
|
||||
if err != nil {
|
||||
t.Errorf("error: %s", err)
|
||||
@ -270,7 +272,7 @@ type ParseErrorTest struct {
|
||||
|
||||
var parseErrorTests = []ParseErrorTest{
|
||||
ParseErrorTest{ANSIC, "Feb 4 21:00:60 2010", "parse"}, // cannot parse Feb as Mon
|
||||
ParseErrorTest{ANSIC, "Thu Feb 4 21:00:57 @2010", "format"},
|
||||
ParseErrorTest{ANSIC, "Thu Feb 4 21:00:57 @2010", "parse"},
|
||||
ParseErrorTest{ANSIC, "Thu Feb 4 21:00:60 2010", "second out of range"},
|
||||
ParseErrorTest{ANSIC, "Thu Feb 4 21:61:57 2010", "minute out of range"},
|
||||
ParseErrorTest{ANSIC, "Thu Feb 4 24:00:60 2010", "hour out of range"},
|
||||
|
||||
Loading…
Reference in New Issue
Block a user