/
date_time.go
220 lines (174 loc) · 4.87 KB
/
date_time.go
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package command
import (
"fmt"
"strings"
"time"
"github.com/ProtonMail/gluon/rfcparser"
)
func ParseDateTime(p *rfcparser.Parser) (time.Time, error) {
// date-time = DQUOTE date-day-fixed "-" date-month "-" date-year SP time SP zone DQUOTE
if err := p.Consume(rfcparser.TokenTypeDQuote, `Expected '"' at start of date time`); err != nil {
return time.Time{}, err
}
dateDay, err := ParseDateDayFixed(p)
if err != nil {
return time.Time{}, err
}
if err := p.Consume(rfcparser.TokenTypeMinus, `Expected '-' after date day`); err != nil {
return time.Time{}, err
}
dateMonth, err := ParseDateMonth(p)
if err != nil {
return time.Time{}, err
}
if err := p.Consume(rfcparser.TokenTypeMinus, `Expected '-' after date month`); err != nil {
return time.Time{}, err
}
dateYear, err := ParseDateYear(p)
if err != nil {
return time.Time{}, err
}
if err := p.Consume(rfcparser.TokenTypeSP, `Expected space after date year`); err != nil {
return time.Time{}, err
}
timeHour, timeMin, timeSec, err := ParseTime(p)
if err != nil {
return time.Time{}, err
}
if err := p.Consume(rfcparser.TokenTypeSP, `Expected space after date time`); err != nil {
return time.Time{}, err
}
timeZone, err := ParseZone(p)
if err != nil {
return time.Time{}, err
}
if err := p.Consume(rfcparser.TokenTypeDQuote, `Expected '"' at end of date time`); err != nil {
return time.Time{}, err
}
return time.Date(dateYear, dateMonth, dateDay, timeHour, timeMin, timeSec, 0, timeZone), nil
}
func ParseDateDayFixed(p *rfcparser.Parser) (int, error) {
// date-day-fixed = (SP DIGIT) / 2DIGIT
if ok, err := p.Matches(rfcparser.TokenTypeSP); err != nil {
return 0, err
} else if ok {
if err := p.Consume(rfcparser.TokenTypeDigit, "expected digit after space separated date day"); err != nil {
return 0, err
}
return rfcparser.ByteToInt(p.PreviousToken().Value), nil
}
return p.ParseNumberN(2)
}
var dateMonthToInt = map[string]time.Month{
"jan": time.January,
"feb": time.February,
"mar": time.March,
"apr": time.April,
"may": time.May,
"jun": time.June,
"jul": time.July,
"aug": time.August,
"sep": time.September,
"oct": time.October,
"nov": time.November,
"dec": time.December,
}
func ParseDateMonth(p *rfcparser.Parser) (time.Month, error) {
month := make([]byte, 3)
for i := 0; i < 3; i++ {
if err := p.Consume(rfcparser.TokenTypeChar, "unexpected character for date month"); err != nil {
return 0, err
}
month[i] = p.PreviousToken().Value
}
v, ok := dateMonthToInt[strings.ToLower(string(month))]
if !ok {
return 0, p.MakeError(fmt.Sprintf("invalid date month '%v'", string(month)))
}
return v, nil
}
func ParseDateYear(p *rfcparser.Parser) (int, error) {
return p.ParseNumberN(4)
}
func ParseZone(p *rfcparser.Parser) (*time.Location, error) {
multiplier := 1
if ok, err := p.Matches(rfcparser.TokenTypePlus); err != nil {
return nil, err
} else if !ok {
if ok, err := p.Matches(rfcparser.TokenTypeMinus); err != nil {
return nil, err
} else if ok {
multiplier = -1
} else {
return nil, p.MakeError("expected either '+' or '-' on time zone start")
}
}
zoneHour, err := p.ParseNumberN(2)
if err != nil {
return nil, err
}
zoneMinute, err := p.ParseNumberN(2)
if err != nil {
return nil, err
}
zone := (zoneHour*3600 + zoneMinute*60) * multiplier
return time.FixedZone("zone", zone), nil
}
func ParseTime(p *rfcparser.Parser) (int, int, int, error) {
hour, err := p.ParseNumberN(2)
if err != nil {
return 0, 0, 0, err
}
if err := p.Consume(rfcparser.TokenTypeColon, "expected colon after hour component"); err != nil {
return 0, 0, 0, err
}
min, err := p.ParseNumberN(2)
if err != nil {
return 0, 0, 0, err
}
if err := p.Consume(rfcparser.TokenTypeColon, "expected colon after minute component"); err != nil {
return 0, 0, 0, err
}
sec, err := p.ParseNumberN(2)
if err != nil {
return 0, 0, 0, err
}
return hour, min, sec, nil
}
func ParseDate(p *rfcparser.Parser) (time.Time, error) {
hasQuotes, err := p.Matches(rfcparser.TokenTypeDQuote)
if err != nil {
return time.Time{}, err
}
date, err := ParseDateText(p)
if err != nil {
return time.Time{}, err
}
if hasQuotes {
if err := p.Consume(rfcparser.TokenTypeDQuote, `expected closing "`); err != nil {
return time.Time{}, err
}
}
return date, nil
}
func ParseDateText(p *rfcparser.Parser) (time.Time, error) {
day, err := p.ParseNumberN(2)
if err != nil {
return time.Time{}, err
}
if err := p.Consume(rfcparser.TokenTypeMinus, "expected - after year"); err != nil {
return time.Time{}, err
}
month, err := ParseDateMonth(p)
if err != nil {
return time.Time{}, err
}
if err := p.Consume(rfcparser.TokenTypeMinus, "expected - after month"); err != nil {
return time.Time{}, err
}
year, err := ParseDateYear(p)
if err != nil {
return time.Time{}, err
}
return time.Date(year, month, day, 0, 0, 0, 0, time.UTC), nil
}