870 lines
24 KiB
Go
870 lines
24 KiB
Go
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package goja
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// This is a slightly modified version of the standard Go parser to make it more compatible with ECMAScript 5.1
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// Changes:
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// - 6-digit extended years are supported in place of long year (2006) in the form of +123456
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// - Timezone formats tolerate colons, e.g. -0700 will parse -07:00
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// - Short week day will also parse long week day
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// - Short month ("Jan") will also parse long month ("January")
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// - Long day ("02") will also parse short day ("2").
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// - Timezone in brackets, "(MST)", will match any string in brackets (e.g. "(GMT Standard Time)")
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// - If offset is not set and timezone name is unknown, an error is returned
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// - If offset and timezone name are both set the offset takes precedence and the resulting Location will be FixedZone("", offset)
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// Original copyright message:
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// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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import (
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"errors"
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"time"
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)
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const (
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_ = iota
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stdLongMonth = iota + stdNeedDate // "January"
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stdMonth // "Jan"
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stdNumMonth // "1"
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stdZeroMonth // "01"
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stdLongWeekDay // "Monday"
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stdWeekDay // "Mon"
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stdDay // "2"
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stdUnderDay // "_2"
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stdZeroDay // "02"
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stdHour = iota + stdNeedClock // "15"
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stdHour12 // "3"
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stdZeroHour12 // "03"
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stdMinute // "4"
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stdZeroMinute // "04"
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stdSecond // "5"
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stdZeroSecond // "05"
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stdLongYear = iota + stdNeedDate // "2006"
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stdYear // "06"
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stdPM = iota + stdNeedClock // "PM"
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stdpm // "pm"
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stdTZ = iota // "MST"
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stdBracketTZ // "(MST)"
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stdISO8601TZ // "Z0700" // prints Z for UTC
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stdISO8601SecondsTZ // "Z070000"
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stdISO8601ShortTZ // "Z07"
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stdISO8601ColonTZ // "Z07:00" // prints Z for UTC
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stdISO8601ColonSecondsTZ // "Z07:00:00"
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stdNumTZ // "-0700" // always numeric
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stdNumSecondsTz // "-070000"
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stdNumShortTZ // "-07" // always numeric
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stdNumColonTZ // "-07:00" // always numeric
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stdNumColonSecondsTZ // "-07:00:00"
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stdFracSecond0 // ".0", ".00", ... , trailing zeros included
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stdFracSecond9 // ".9", ".99", ..., trailing zeros omitted
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stdNeedDate = 1 << 8 // need month, day, year
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stdNeedClock = 2 << 8 // need hour, minute, second
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stdArgShift = 16 // extra argument in high bits, above low stdArgShift
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stdMask = 1<<stdArgShift - 1 // mask out argument
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)
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var errBad = errors.New("bad value for field") // placeholder not passed to user
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func parseDate(layout, value string, defaultLocation *time.Location) (time.Time, error) {
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alayout, avalue := layout, value
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rangeErrString := "" // set if a value is out of range
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amSet := false // do we need to subtract 12 from the hour for midnight?
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pmSet := false // do we need to add 12 to the hour?
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// Time being constructed.
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var (
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year int
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month int = 1 // January
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day int = 1
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hour int
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min int
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sec int
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nsec int
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z *time.Location
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zoneOffset int = -1
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zoneName string
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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 error
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prefix, std, suffix := nextStdChunk(layout)
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stdstr := layout[len(prefix) : len(layout)-len(suffix)]
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value, err = skip(value, prefix)
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if err != nil {
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return time.Time{}, &time.ParseError{Layout: alayout, Value: avalue, LayoutElem: prefix, ValueElem: value}
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}
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if std == 0 {
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if len(value) != 0 {
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return time.Time{}, &time.ParseError{Layout: alayout, Value: avalue, ValueElem: value, Message: ": 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 & stdMask {
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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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year, err = atoi(p)
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if year >= 69 { // Unix time starts Dec 31 1969 in some time zones
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year += 1900
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} else {
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year += 2000
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}
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case stdLongYear:
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if len(value) >= 7 && (value[0] == '-' || value[0] == '+') { // extended year
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neg := value[0] == '-'
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p, value = value[1:7], value[7:]
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year, err = atoi(p)
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if neg {
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if year == 0 {
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err = errBad
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break
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}
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year = -year
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}
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} else {
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if len(value) < 4 || !isDigit(value, 0) {
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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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year, err = atoi(p)
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}
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case stdMonth:
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month, value, err = lookup(longMonthNames, value)
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if err != nil {
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month, value, err = lookup(shortMonthNames, value)
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}
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month++
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case stdLongMonth:
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month, value, err = lookup(longMonthNames, value)
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month++
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case stdNumMonth, stdZeroMonth:
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month, value, err = getnum(value, std == stdZeroMonth)
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if month <= 0 || 12 < month {
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rangeErrString = "month"
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}
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case stdWeekDay:
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// Ignore weekday except for error checking.
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_, value, err = lookup(longDayNames, value)
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if err != nil {
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_, value, err = lookup(shortDayNames, value)
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}
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case stdLongWeekDay:
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_, value, err = lookup(longDayNames, value)
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case stdDay, stdUnderDay, stdZeroDay:
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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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day, value, err = getnum(value, false)
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if day < 0 {
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// Note that we allow any one- or two-digit day here.
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rangeErrString = "day"
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}
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case stdHour:
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hour, value, err = getnum(value, false)
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if hour < 0 || 24 <= hour {
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rangeErrString = "hour"
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}
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case stdHour12, stdZeroHour12:
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hour, value, err = getnum(value, std == stdZeroHour12)
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if hour < 0 || 12 < hour {
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rangeErrString = "hour"
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}
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case stdMinute, stdZeroMinute:
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min, value, err = getnum(value, std == stdZeroMinute)
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if min < 0 || 60 <= min {
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rangeErrString = "minute"
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}
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case stdSecond, stdZeroSecond:
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sec, value, err = getnum(value, std == stdZeroSecond)
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if sec < 0 || 60 <= sec {
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rangeErrString = "second"
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break
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}
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// Special case: do we have a fractional second but no
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// fractional second in the format?
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if len(value) >= 2 && value[0] == '.' && isDigit(value, 1) {
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_, std, _ = nextStdChunk(layout)
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std &= stdMask
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if std == stdFracSecond0 || std == stdFracSecond9 {
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// Fractional second in the layout; proceed normally
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break
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}
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// No fractional second in the layout but we have one in the input.
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n := 2
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for ; n < len(value) && isDigit(value, n); n++ {
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}
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nsec, rangeErrString, err = parseNanoseconds(value, n)
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value = value[n:]
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}
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case stdPM:
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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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switch p {
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case "PM":
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pmSet = true
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case "AM":
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amSet = true
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default:
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err = errBad
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}
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case stdpm:
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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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switch p {
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case "pm":
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pmSet = true
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case "am":
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amSet = true
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default:
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err = errBad
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}
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case stdISO8601TZ, stdISO8601ColonTZ, stdISO8601SecondsTZ, stdISO8601ShortTZ, stdISO8601ColonSecondsTZ, stdNumTZ, stdNumShortTZ, stdNumColonTZ, stdNumSecondsTz, stdNumColonSecondsTZ:
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if (std == stdISO8601TZ || std == stdISO8601ShortTZ || std == stdISO8601ColonTZ ||
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std == stdISO8601SecondsTZ || std == stdISO8601ColonSecondsTZ) && len(value) >= 1 && value[0] == 'Z' {
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value = value[1:]
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z = time.UTC
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break
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}
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var sign, hour, min, seconds string
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if std == stdISO8601ColonTZ || std == stdNumColonTZ || std == stdNumTZ || std == stdISO8601TZ {
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if len(value) < 4 {
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err = errBad
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break
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}
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if value[3] != ':' {
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if std == stdNumColonTZ || std == stdISO8601ColonTZ || len(value) < 5 {
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err = errBad
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break
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}
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sign, hour, min, seconds, value = value[0:1], value[1:3], value[3:5], "00", value[5:]
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} else {
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if len(value) < 6 {
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err = errBad
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break
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}
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sign, hour, min, seconds, value = value[0:1], value[1:3], value[4:6], "00", value[6:]
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}
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} else if std == stdNumShortTZ || std == stdISO8601ShortTZ {
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if len(value) < 3 {
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err = errBad
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break
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}
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sign, hour, min, seconds, value = value[0:1], value[1:3], "00", "00", value[3:]
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} else if std == stdISO8601ColonSecondsTZ || std == stdNumColonSecondsTZ || std == stdISO8601SecondsTZ || std == stdNumSecondsTz {
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if len(value) < 7 {
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err = errBad
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break
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}
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if value[3] != ':' || value[6] != ':' {
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if std == stdISO8601ColonSecondsTZ || std == stdNumColonSecondsTZ || len(value) < 7 {
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err = errBad
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break
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}
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sign, hour, min, seconds, value = value[0:1], value[1:3], value[3:5], value[5:7], value[7:]
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} else {
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if len(value) < 9 {
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err = errBad
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break
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}
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sign, hour, min, seconds, value = value[0:1], value[1:3], value[4:6], value[7:9], value[9:]
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}
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}
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var hr, mm, ss int
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hr, err = atoi(hour)
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if err == nil {
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mm, err = atoi(min)
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}
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if err == nil {
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ss, err = atoi(seconds)
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}
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zoneOffset = (hr*60+mm)*60 + ss // offset is in seconds
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switch sign[0] {
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case '+':
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case '-':
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zoneOffset = -zoneOffset
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default:
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err = errBad
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}
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case stdTZ:
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// Does it look like a time zone?
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if len(value) >= 3 && value[0:3] == "UTC" {
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z = time.UTC
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value = value[3:]
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break
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}
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n, ok := parseTimeZone(value)
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if !ok {
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err = errBad
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break
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}
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zoneName, value = value[:n], value[n:]
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case stdBracketTZ:
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if len(value) < 3 || value[0] != '(' {
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err = errBad
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break
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}
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i := 1
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for ; ; i++ {
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if i >= len(value) {
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err = errBad
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break
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}
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if value[i] == ')' {
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zoneName, value = value[1:i], value[i+1:]
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break
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}
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}
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case stdFracSecond0:
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// stdFracSecond0 requires the exact number of digits as specified in
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// the layout.
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ndigit := 1 + (std >> stdArgShift)
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if len(value) < ndigit {
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err = errBad
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break
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}
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nsec, rangeErrString, err = parseNanoseconds(value, ndigit)
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value = value[ndigit:]
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case stdFracSecond9:
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if len(value) < 2 || value[0] != '.' || value[1] < '0' || '9' < value[1] {
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// Fractional second omitted.
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break
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}
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// Take any number of digits, even more than asked for,
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// because it is what the stdSecond case would do.
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i := 0
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for i < 9 && i+1 < len(value) && '0' <= value[i+1] && value[i+1] <= '9' {
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i++
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}
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nsec, rangeErrString, err = parseNanoseconds(value, 1+i)
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value = value[1+i:]
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}
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if rangeErrString != "" {
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return time.Time{}, &time.ParseError{Layout: alayout, Value: avalue, LayoutElem: stdstr, ValueElem: value, Message: ": " + rangeErrString + " out of range"}
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}
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if err != nil {
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return time.Time{}, &time.ParseError{Layout: alayout, Value: avalue, LayoutElem: stdstr, ValueElem: value}
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}
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}
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if pmSet && hour < 12 {
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hour += 12
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} else if amSet && hour == 12 {
|
||
|
|
hour = 0
|
||
|
|
}
|
||
|
|
|
||
|
|
// Validate the day of the month.
|
||
|
|
if day < 1 || day > daysIn(time.Month(month), year) {
|
||
|
|
return time.Time{}, &time.ParseError{Layout: alayout, Value: avalue, ValueElem: value, Message: ": day out of range"}
|
||
|
|
}
|
||
|
|
|
||
|
|
if z == nil {
|
||
|
|
if zoneOffset == -1 {
|
||
|
|
if zoneName != "" {
|
||
|
|
if z1, err := time.LoadLocation(zoneName); err == nil {
|
||
|
|
z = z1
|
||
|
|
} else {
|
||
|
|
return time.Time{}, &time.ParseError{Layout: alayout, Value: avalue, ValueElem: value, Message: ": unknown timezone"}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
z = defaultLocation
|
||
|
|
}
|
||
|
|
} else if zoneOffset == 0 {
|
||
|
|
z = time.UTC
|
||
|
|
} else {
|
||
|
|
z = time.FixedZone("", zoneOffset)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return time.Date(year, time.Month(month), day, hour, min, sec, nsec, z), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
var errLeadingInt = errors.New("time: bad [0-9]*") // never printed
|
||
|
|
|
||
|
|
func signedLeadingInt(s string) (x int64, rem string, err error) {
|
||
|
|
neg := false
|
||
|
|
if s != "" && (s[0] == '-' || s[0] == '+') {
|
||
|
|
neg = s[0] == '-'
|
||
|
|
s = s[1:]
|
||
|
|
}
|
||
|
|
x, rem, err = leadingInt(s)
|
||
|
|
if err != nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
if neg {
|
||
|
|
x = -x
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
// leadingInt consumes the leading [0-9]* from s.
|
||
|
|
func leadingInt(s string) (x int64, rem string, err error) {
|
||
|
|
i := 0
|
||
|
|
for ; i < len(s); i++ {
|
||
|
|
c := s[i]
|
||
|
|
if c < '0' || c > '9' {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
if x > (1<<63-1)/10 {
|
||
|
|
// overflow
|
||
|
|
return 0, "", errLeadingInt
|
||
|
|
}
|
||
|
|
x = x*10 + int64(c) - '0'
|
||
|
|
if x < 0 {
|
||
|
|
// overflow
|
||
|
|
return 0, "", errLeadingInt
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return x, s[i:], nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// nextStdChunk finds the first occurrence of a std string in
|
||
|
|
// layout and returns the text before, the std string, and the text after.
|
||
|
|
func nextStdChunk(layout string) (prefix string, std int, suffix string) {
|
||
|
|
for i := 0; i < len(layout); i++ {
|
||
|
|
switch c := int(layout[i]); c {
|
||
|
|
case 'J': // January, Jan
|
||
|
|
if len(layout) >= i+3 && layout[i:i+3] == "Jan" {
|
||
|
|
if len(layout) >= i+7 && layout[i:i+7] == "January" {
|
||
|
|
return layout[0:i], stdLongMonth, layout[i+7:]
|
||
|
|
}
|
||
|
|
if !startsWithLowerCase(layout[i+3:]) {
|
||
|
|
return layout[0:i], stdMonth, layout[i+3:]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
case 'M': // Monday, Mon, MST
|
||
|
|
if len(layout) >= i+3 {
|
||
|
|
if layout[i:i+3] == "Mon" {
|
||
|
|
if len(layout) >= i+6 && layout[i:i+6] == "Monday" {
|
||
|
|
return layout[0:i], stdLongWeekDay, layout[i+6:]
|
||
|
|
}
|
||
|
|
if !startsWithLowerCase(layout[i+3:]) {
|
||
|
|
return layout[0:i], stdWeekDay, layout[i+3:]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if layout[i:i+3] == "MST" {
|
||
|
|
return layout[0:i], stdTZ, layout[i+3:]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
case '0': // 01, 02, 03, 04, 05, 06
|
||
|
|
if len(layout) >= i+2 && '1' <= layout[i+1] && layout[i+1] <= '6' {
|
||
|
|
return layout[0:i], std0x[layout[i+1]-'1'], layout[i+2:]
|
||
|
|
}
|
||
|
|
|
||
|
|
case '1': // 15, 1
|
||
|
|
if len(layout) >= i+2 && layout[i+1] == '5' {
|
||
|
|
return layout[0:i], stdHour, layout[i+2:]
|
||
|
|
}
|
||
|
|
return layout[0:i], stdNumMonth, layout[i+1:]
|
||
|
|
|
||
|
|
case '2': // 2006, 2
|
||
|
|
if len(layout) >= i+4 && layout[i:i+4] == "2006" {
|
||
|
|
return layout[0:i], stdLongYear, layout[i+4:]
|
||
|
|
}
|
||
|
|
return layout[0:i], stdDay, layout[i+1:]
|
||
|
|
|
||
|
|
case '_': // _2, _2006
|
||
|
|
if len(layout) >= i+2 && layout[i+1] == '2' {
|
||
|
|
//_2006 is really a literal _, followed by stdLongYear
|
||
|
|
if len(layout) >= i+5 && layout[i+1:i+5] == "2006" {
|
||
|
|
return layout[0 : i+1], stdLongYear, layout[i+5:]
|
||
|
|
}
|
||
|
|
return layout[0:i], stdUnderDay, layout[i+2:]
|
||
|
|
}
|
||
|
|
|
||
|
|
case '3':
|
||
|
|
return layout[0:i], stdHour12, layout[i+1:]
|
||
|
|
|
||
|
|
case '4':
|
||
|
|
return layout[0:i], stdMinute, layout[i+1:]
|
||
|
|
|
||
|
|
case '5':
|
||
|
|
return layout[0:i], stdSecond, layout[i+1:]
|
||
|
|
|
||
|
|
case 'P': // PM
|
||
|
|
if len(layout) >= i+2 && layout[i+1] == 'M' {
|
||
|
|
return layout[0:i], stdPM, layout[i+2:]
|
||
|
|
}
|
||
|
|
|
||
|
|
case 'p': // pm
|
||
|
|
if len(layout) >= i+2 && layout[i+1] == 'm' {
|
||
|
|
return layout[0:i], stdpm, layout[i+2:]
|
||
|
|
}
|
||
|
|
|
||
|
|
case '-': // -070000, -07:00:00, -0700, -07:00, -07
|
||
|
|
if len(layout) >= i+7 && layout[i:i+7] == "-070000" {
|
||
|
|
return layout[0:i], stdNumSecondsTz, layout[i+7:]
|
||
|
|
}
|
||
|
|
if len(layout) >= i+9 && layout[i:i+9] == "-07:00:00" {
|
||
|
|
return layout[0:i], stdNumColonSecondsTZ, layout[i+9:]
|
||
|
|
}
|
||
|
|
if len(layout) >= i+5 && layout[i:i+5] == "-0700" {
|
||
|
|
return layout[0:i], stdNumTZ, layout[i+5:]
|
||
|
|
}
|
||
|
|
if len(layout) >= i+6 && layout[i:i+6] == "-07:00" {
|
||
|
|
return layout[0:i], stdNumColonTZ, layout[i+6:]
|
||
|
|
}
|
||
|
|
if len(layout) >= i+3 && layout[i:i+3] == "-07" {
|
||
|
|
return layout[0:i], stdNumShortTZ, layout[i+3:]
|
||
|
|
}
|
||
|
|
|
||
|
|
case 'Z': // Z070000, Z07:00:00, Z0700, Z07:00,
|
||
|
|
if len(layout) >= i+7 && layout[i:i+7] == "Z070000" {
|
||
|
|
return layout[0:i], stdISO8601SecondsTZ, layout[i+7:]
|
||
|
|
}
|
||
|
|
if len(layout) >= i+9 && layout[i:i+9] == "Z07:00:00" {
|
||
|
|
return layout[0:i], stdISO8601ColonSecondsTZ, layout[i+9:]
|
||
|
|
}
|
||
|
|
if len(layout) >= i+5 && layout[i:i+5] == "Z0700" {
|
||
|
|
return layout[0:i], stdISO8601TZ, layout[i+5:]
|
||
|
|
}
|
||
|
|
if len(layout) >= i+6 && layout[i:i+6] == "Z07:00" {
|
||
|
|
return layout[0:i], stdISO8601ColonTZ, layout[i+6:]
|
||
|
|
}
|
||
|
|
if len(layout) >= i+3 && layout[i:i+3] == "Z07" {
|
||
|
|
return layout[0:i], stdISO8601ShortTZ, layout[i+3:]
|
||
|
|
}
|
||
|
|
|
||
|
|
case '.': // .000 or .999 - repeated digits for fractional seconds.
|
||
|
|
if i+1 < len(layout) && (layout[i+1] == '0' || layout[i+1] == '9') {
|
||
|
|
ch := layout[i+1]
|
||
|
|
j := i + 1
|
||
|
|
for j < len(layout) && layout[j] == ch {
|
||
|
|
j++
|
||
|
|
}
|
||
|
|
// String of digits must end here - only fractional second is all digits.
|
||
|
|
if !isDigit(layout, j) {
|
||
|
|
std := stdFracSecond0
|
||
|
|
if layout[i+1] == '9' {
|
||
|
|
std = stdFracSecond9
|
||
|
|
}
|
||
|
|
std |= (j - (i + 1)) << stdArgShift
|
||
|
|
return layout[0:i], std, layout[j:]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
case '(':
|
||
|
|
if len(layout) >= i+5 && layout[i:i+5] == "(MST)" {
|
||
|
|
return layout[0:i], stdBracketTZ, layout[i+5:]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return layout, 0, ""
|
||
|
|
}
|
||
|
|
|
||
|
|
var longDayNames = []string{
|
||
|
|
"Sunday",
|
||
|
|
"Monday",
|
||
|
|
"Tuesday",
|
||
|
|
"Wednesday",
|
||
|
|
"Thursday",
|
||
|
|
"Friday",
|
||
|
|
"Saturday",
|
||
|
|
}
|
||
|
|
|
||
|
|
var shortDayNames = []string{
|
||
|
|
"Sun",
|
||
|
|
"Mon",
|
||
|
|
"Tue",
|
||
|
|
"Wed",
|
||
|
|
"Thu",
|
||
|
|
"Fri",
|
||
|
|
"Sat",
|
||
|
|
}
|
||
|
|
|
||
|
|
var shortMonthNames = []string{
|
||
|
|
"Jan",
|
||
|
|
"Feb",
|
||
|
|
"Mar",
|
||
|
|
"Apr",
|
||
|
|
"May",
|
||
|
|
"Jun",
|
||
|
|
"Jul",
|
||
|
|
"Aug",
|
||
|
|
"Sep",
|
||
|
|
"Oct",
|
||
|
|
"Nov",
|
||
|
|
"Dec",
|
||
|
|
}
|
||
|
|
|
||
|
|
var longMonthNames = []string{
|
||
|
|
"January",
|
||
|
|
"February",
|
||
|
|
"March",
|
||
|
|
"April",
|
||
|
|
"May",
|
||
|
|
"June",
|
||
|
|
"July",
|
||
|
|
"August",
|
||
|
|
"September",
|
||
|
|
"October",
|
||
|
|
"November",
|
||
|
|
"December",
|
||
|
|
}
|
||
|
|
|
||
|
|
// isDigit reports whether s[i] is in range and is a decimal digit.
|
||
|
|
func isDigit(s string, i int) bool {
|
||
|
|
if len(s) <= i {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
c := s[i]
|
||
|
|
return '0' <= c && c <= '9'
|
||
|
|
}
|
||
|
|
|
||
|
|
// getnum parses s[0:1] or s[0:2] (fixed forces the latter)
|
||
|
|
// as a decimal integer and returns the integer and the
|
||
|
|
// remainder of the string.
|
||
|
|
func getnum(s string, fixed bool) (int, string, error) {
|
||
|
|
if !isDigit(s, 0) {
|
||
|
|
return 0, s, errBad
|
||
|
|
}
|
||
|
|
if !isDigit(s, 1) {
|
||
|
|
if fixed {
|
||
|
|
return 0, s, errBad
|
||
|
|
}
|
||
|
|
return int(s[0] - '0'), s[1:], nil
|
||
|
|
}
|
||
|
|
return int(s[0]-'0')*10 + int(s[1]-'0'), s[2:], nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func cutspace(s string) string {
|
||
|
|
for len(s) > 0 && s[0] == ' ' {
|
||
|
|
s = s[1:]
|
||
|
|
}
|
||
|
|
return s
|
||
|
|
}
|
||
|
|
|
||
|
|
// skip removes the given prefix from value,
|
||
|
|
// treating runs of space characters as equivalent.
|
||
|
|
func skip(value, prefix string) (string, error) {
|
||
|
|
for len(prefix) > 0 {
|
||
|
|
if prefix[0] == ' ' {
|
||
|
|
if len(value) > 0 && value[0] != ' ' {
|
||
|
|
return value, errBad
|
||
|
|
}
|
||
|
|
prefix = cutspace(prefix)
|
||
|
|
value = cutspace(value)
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if len(value) == 0 || value[0] != prefix[0] {
|
||
|
|
return value, errBad
|
||
|
|
}
|
||
|
|
prefix = prefix[1:]
|
||
|
|
value = value[1:]
|
||
|
|
}
|
||
|
|
return value, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Never printed, just needs to be non-nil for return by atoi.
|
||
|
|
var atoiError = errors.New("time: invalid number")
|
||
|
|
|
||
|
|
// Duplicates functionality in strconv, but avoids dependency.
|
||
|
|
func atoi(s string) (x int, err error) {
|
||
|
|
q, rem, err := signedLeadingInt(s)
|
||
|
|
x = int(q)
|
||
|
|
if err != nil || rem != "" {
|
||
|
|
return 0, atoiError
|
||
|
|
}
|
||
|
|
return x, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// match reports whether s1 and s2 match ignoring case.
|
||
|
|
// It is assumed s1 and s2 are the same length.
|
||
|
|
func match(s1, s2 string) bool {
|
||
|
|
for i := 0; i < len(s1); i++ {
|
||
|
|
c1 := s1[i]
|
||
|
|
c2 := s2[i]
|
||
|
|
if c1 != c2 {
|
||
|
|
// Switch to lower-case; 'a'-'A' is known to be a single bit.
|
||
|
|
c1 |= 'a' - 'A'
|
||
|
|
c2 |= 'a' - 'A'
|
||
|
|
if c1 != c2 || c1 < 'a' || c1 > 'z' {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
func lookup(tab []string, val string) (int, string, error) {
|
||
|
|
for i, v := range tab {
|
||
|
|
if len(val) >= len(v) && match(val[0:len(v)], v) {
|
||
|
|
return i, val[len(v):], nil
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return -1, val, errBad
|
||
|
|
}
|
||
|
|
|
||
|
|
// daysBefore[m] counts the number of days in a non-leap year
|
||
|
|
// before month m begins. There is an entry for m=12, counting
|
||
|
|
// the number of days before January of next year (365).
|
||
|
|
var daysBefore = [...]int32{
|
||
|
|
0,
|
||
|
|
31,
|
||
|
|
31 + 28,
|
||
|
|
31 + 28 + 31,
|
||
|
|
31 + 28 + 31 + 30,
|
||
|
|
31 + 28 + 31 + 30 + 31,
|
||
|
|
31 + 28 + 31 + 30 + 31 + 30,
|
||
|
|
31 + 28 + 31 + 30 + 31 + 30 + 31,
|
||
|
|
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
|
||
|
|
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
|
||
|
|
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
|
||
|
|
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
|
||
|
|
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31,
|
||
|
|
}
|
||
|
|
|
||
|
|
func isLeap(year int) bool {
|
||
|
|
return year%4 == 0 && (year%100 != 0 || year%400 == 0)
|
||
|
|
}
|
||
|
|
|
||
|
|
func daysIn(m time.Month, year int) int {
|
||
|
|
if m == time.February && isLeap(year) {
|
||
|
|
return 29
|
||
|
|
}
|
||
|
|
return int(daysBefore[m] - daysBefore[m-1])
|
||
|
|
}
|
||
|
|
|
||
|
|
// parseTimeZone parses a time zone string and returns its length. Time zones
|
||
|
|
// are human-generated and unpredictable. We can't do precise error checking.
|
||
|
|
// On the other hand, for a correct parse there must be a time zone at the
|
||
|
|
// beginning of the string, so it's almost always true that there's one
|
||
|
|
// there. We look at the beginning of the string for a run of upper-case letters.
|
||
|
|
// If there are more than 5, it's an error.
|
||
|
|
// If there are 4 or 5 and the last is a T, it's a time zone.
|
||
|
|
// If there are 3, it's a time zone.
|
||
|
|
// Otherwise, other than special cases, it's not a time zone.
|
||
|
|
// GMT is special because it can have an hour offset.
|
||
|
|
func parseTimeZone(value string) (length int, ok bool) {
|
||
|
|
if len(value) < 3 {
|
||
|
|
return 0, false
|
||
|
|
}
|
||
|
|
// Special case 1: ChST and MeST are the only zones with a lower-case letter.
|
||
|
|
if len(value) >= 4 && (value[:4] == "ChST" || value[:4] == "MeST") {
|
||
|
|
return 4, true
|
||
|
|
}
|
||
|
|
// Special case 2: GMT may have an hour offset; treat it specially.
|
||
|
|
if value[:3] == "GMT" {
|
||
|
|
length = parseGMT(value)
|
||
|
|
return length, true
|
||
|
|
}
|
||
|
|
// Special Case 3: Some time zones are not named, but have +/-00 format
|
||
|
|
if value[0] == '+' || value[0] == '-' {
|
||
|
|
length = parseSignedOffset(value)
|
||
|
|
return length, true
|
||
|
|
}
|
||
|
|
// How many upper-case letters are there? Need at least three, at most five.
|
||
|
|
var nUpper int
|
||
|
|
for nUpper = 0; nUpper < 6; nUpper++ {
|
||
|
|
if nUpper >= len(value) {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
if c := value[nUpper]; c < 'A' || 'Z' < c {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
switch nUpper {
|
||
|
|
case 0, 1, 2, 6:
|
||
|
|
return 0, false
|
||
|
|
case 5: // Must end in T to match.
|
||
|
|
if value[4] == 'T' {
|
||
|
|
return 5, true
|
||
|
|
}
|
||
|
|
case 4:
|
||
|
|
// Must end in T, except one special case.
|
||
|
|
if value[3] == 'T' || value[:4] == "WITA" {
|
||
|
|
return 4, true
|
||
|
|
}
|
||
|
|
case 3:
|
||
|
|
return 3, true
|
||
|
|
}
|
||
|
|
return 0, false
|
||
|
|
}
|
||
|
|
|
||
|
|
// parseGMT parses a GMT time zone. The input string is known to start "GMT".
|
||
|
|
// The function checks whether that is followed by a sign and a number in the
|
||
|
|
// range -14 through 12 excluding zero.
|
||
|
|
func parseGMT(value string) int {
|
||
|
|
value = value[3:]
|
||
|
|
if len(value) == 0 {
|
||
|
|
return 3
|
||
|
|
}
|
||
|
|
|
||
|
|
return 3 + parseSignedOffset(value)
|
||
|
|
}
|
||
|
|
|
||
|
|
// parseSignedOffset parses a signed timezone offset (e.g. "+03" or "-04").
|
||
|
|
// The function checks for a signed number in the range -14 through +12 excluding zero.
|
||
|
|
// Returns length of the found offset string or 0 otherwise
|
||
|
|
func parseSignedOffset(value string) int {
|
||
|
|
sign := value[0]
|
||
|
|
if sign != '-' && sign != '+' {
|
||
|
|
return 0
|
||
|
|
}
|
||
|
|
x, rem, err := leadingInt(value[1:])
|
||
|
|
if err != nil {
|
||
|
|
return 0
|
||
|
|
}
|
||
|
|
if sign == '-' {
|
||
|
|
x = -x
|
||
|
|
}
|
||
|
|
if x == 0 || x < -14 || 12 < x {
|
||
|
|
return 0
|
||
|
|
}
|
||
|
|
return len(value) - len(rem)
|
||
|
|
}
|
||
|
|
|
||
|
|
func parseNanoseconds(value string, nbytes int) (ns int, rangeErrString string, err error) {
|
||
|
|
if value[0] != '.' {
|
||
|
|
err = errBad
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if ns, err = atoi(value[1:nbytes]); err != nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if ns < 0 || 1e9 <= ns {
|
||
|
|
rangeErrString = "fractional second"
|
||
|
|
return
|
||
|
|
}
|
||
|
|
// We need nanoseconds, which means scaling by the number
|
||
|
|
// of missing digits in the format, maximum length 10. If it's
|
||
|
|
// longer than 10, we won't scale.
|
||
|
|
scaleDigits := 10 - nbytes
|
||
|
|
for i := 0; i < scaleDigits; i++ {
|
||
|
|
ns *= 10
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
// std0x records the std values for "01", "02", ..., "06".
|
||
|
|
var std0x = [...]int{stdZeroMonth, stdZeroDay, stdZeroHour12, stdZeroMinute, stdZeroSecond, stdYear}
|
||
|
|
|
||
|
|
// startsWithLowerCase reports whether the string has a lower-case letter at the beginning.
|
||
|
|
// Its purpose is to prevent matching strings like "Month" when looking for "Mon".
|
||
|
|
func startsWithLowerCase(str string) bool {
|
||
|
|
if len(str) == 0 {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
c := str[0]
|
||
|
|
return 'a' <= c && c <= 'z'
|
||
|
|
}
|