mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-20 07:21:01 +00:00
550 lines
12 KiB
Go
550 lines
12 KiB
Go
package toml
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import (
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"fmt"
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"math"
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"strconv"
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"time"
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"github.com/pelletier/go-toml/v2/unstable"
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)
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func parseInteger(b []byte) (int64, error) {
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if len(b) > 2 && b[0] == '0' {
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switch b[1] {
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case 'x':
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return parseIntHex(b)
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case 'b':
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return parseIntBin(b)
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case 'o':
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return parseIntOct(b)
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default:
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panic(fmt.Errorf("invalid base '%c', should have been checked by scanIntOrFloat", b[1]))
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}
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}
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return parseIntDec(b)
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}
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func parseLocalDate(b []byte) (LocalDate, error) {
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// full-date = date-fullyear "-" date-month "-" date-mday
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// date-fullyear = 4DIGIT
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// date-month = 2DIGIT ; 01-12
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// date-mday = 2DIGIT ; 01-28, 01-29, 01-30, 01-31 based on month/year
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var date LocalDate
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if len(b) != 10 || b[4] != '-' || b[7] != '-' {
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return date, unstable.NewParserError(b, "dates are expected to have the format YYYY-MM-DD")
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}
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var err error
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date.Year, err = parseDecimalDigits(b[0:4])
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if err != nil {
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return LocalDate{}, err
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}
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date.Month, err = parseDecimalDigits(b[5:7])
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if err != nil {
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return LocalDate{}, err
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}
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date.Day, err = parseDecimalDigits(b[8:10])
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if err != nil {
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return LocalDate{}, err
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}
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if !isValidDate(date.Year, date.Month, date.Day) {
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return LocalDate{}, unstable.NewParserError(b, "impossible date")
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}
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return date, nil
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}
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func parseDecimalDigits(b []byte) (int, error) {
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v := 0
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for i, c := range b {
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if c < '0' || c > '9' {
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return 0, unstable.NewParserError(b[i:i+1], "expected digit (0-9)")
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}
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v *= 10
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v += int(c - '0')
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}
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return v, nil
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}
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func parseDateTime(b []byte) (time.Time, error) {
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// offset-date-time = full-date time-delim full-time
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// full-time = partial-time time-offset
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// time-offset = "Z" / time-numoffset
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// time-numoffset = ( "+" / "-" ) time-hour ":" time-minute
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dt, b, err := parseLocalDateTime(b)
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if err != nil {
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return time.Time{}, err
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}
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var zone *time.Location
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if len(b) == 0 {
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// parser should have checked that when assigning the date time node
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panic("date time should have a timezone")
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}
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if b[0] == 'Z' || b[0] == 'z' {
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b = b[1:]
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zone = time.UTC
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} else {
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const dateTimeByteLen = 6
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if len(b) != dateTimeByteLen {
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return time.Time{}, unstable.NewParserError(b, "invalid date-time timezone")
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}
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var direction int
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switch b[0] {
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case '-':
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direction = -1
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case '+':
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direction = +1
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default:
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return time.Time{}, unstable.NewParserError(b[:1], "invalid timezone offset character")
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}
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if b[3] != ':' {
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return time.Time{}, unstable.NewParserError(b[3:4], "expected a : separator")
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}
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hours, err := parseDecimalDigits(b[1:3])
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if err != nil {
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return time.Time{}, err
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}
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if hours > 23 {
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return time.Time{}, unstable.NewParserError(b[:1], "invalid timezone offset hours")
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}
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minutes, err := parseDecimalDigits(b[4:6])
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if err != nil {
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return time.Time{}, err
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}
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if minutes > 59 {
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return time.Time{}, unstable.NewParserError(b[:1], "invalid timezone offset minutes")
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}
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seconds := direction * (hours*3600 + minutes*60)
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if seconds == 0 {
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zone = time.UTC
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} else {
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zone = time.FixedZone("", seconds)
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}
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b = b[dateTimeByteLen:]
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}
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if len(b) > 0 {
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return time.Time{}, unstable.NewParserError(b, "extra bytes at the end of the timezone")
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}
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t := time.Date(
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dt.Year,
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time.Month(dt.Month),
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dt.Day,
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dt.Hour,
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dt.Minute,
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dt.Second,
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dt.Nanosecond,
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zone)
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return t, nil
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}
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func parseLocalDateTime(b []byte) (LocalDateTime, []byte, error) {
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var dt LocalDateTime
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const localDateTimeByteMinLen = 11
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if len(b) < localDateTimeByteMinLen {
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return dt, nil, unstable.NewParserError(b, "local datetimes are expected to have the format YYYY-MM-DDTHH:MM:SS[.NNNNNNNNN]")
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}
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date, err := parseLocalDate(b[:10])
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if err != nil {
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return dt, nil, err
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}
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dt.LocalDate = date
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sep := b[10]
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if sep != 'T' && sep != ' ' && sep != 't' {
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return dt, nil, unstable.NewParserError(b[10:11], "datetime separator is expected to be T or a space")
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}
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t, rest, err := parseLocalTime(b[11:])
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if err != nil {
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return dt, nil, err
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}
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dt.LocalTime = t
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return dt, rest, nil
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}
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// parseLocalTime is a bit different because it also returns the remaining
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// []byte that is didn't need. This is to allow parseDateTime to parse those
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// remaining bytes as a timezone.
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func parseLocalTime(b []byte) (LocalTime, []byte, error) {
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var (
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nspow = [10]int{0, 1e8, 1e7, 1e6, 1e5, 1e4, 1e3, 1e2, 1e1, 1e0}
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t LocalTime
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)
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// check if b matches to have expected format HH:MM:SS[.NNNNNN]
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const localTimeByteLen = 8
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if len(b) < localTimeByteLen {
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return t, nil, unstable.NewParserError(b, "times are expected to have the format HH:MM:SS[.NNNNNN]")
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}
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var err error
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t.Hour, err = parseDecimalDigits(b[0:2])
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if err != nil {
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return t, nil, err
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}
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if t.Hour > 23 {
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return t, nil, unstable.NewParserError(b[0:2], "hour cannot be greater 23")
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}
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if b[2] != ':' {
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return t, nil, unstable.NewParserError(b[2:3], "expecting colon between hours and minutes")
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}
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t.Minute, err = parseDecimalDigits(b[3:5])
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if err != nil {
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return t, nil, err
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}
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if t.Minute > 59 {
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return t, nil, unstable.NewParserError(b[3:5], "minutes cannot be greater 59")
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}
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if b[5] != ':' {
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return t, nil, unstable.NewParserError(b[5:6], "expecting colon between minutes and seconds")
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}
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t.Second, err = parseDecimalDigits(b[6:8])
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if err != nil {
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return t, nil, err
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}
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if t.Second > 60 {
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return t, nil, unstable.NewParserError(b[6:8], "seconds cannot be greater 60")
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}
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b = b[8:]
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if len(b) >= 1 && b[0] == '.' {
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frac := 0
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precision := 0
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digits := 0
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for i, c := range b[1:] {
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if !isDigit(c) {
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if i == 0 {
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return t, nil, unstable.NewParserError(b[0:1], "need at least one digit after fraction point")
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}
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break
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}
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digits++
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const maxFracPrecision = 9
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if i >= maxFracPrecision {
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// go-toml allows decoding fractional seconds
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// beyond the supported precision of 9
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// digits. It truncates the fractional component
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// to the supported precision and ignores the
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// remaining digits.
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//
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// https://github.com/pelletier/go-toml/discussions/707
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continue
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}
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frac *= 10
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frac += int(c - '0')
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precision++
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}
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if precision == 0 {
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return t, nil, unstable.NewParserError(b[:1], "nanoseconds need at least one digit")
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}
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t.Nanosecond = frac * nspow[precision]
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t.Precision = precision
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return t, b[1+digits:], nil
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}
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return t, b, nil
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}
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//nolint:cyclop
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func parseFloat(b []byte) (float64, error) {
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if len(b) == 4 && (b[0] == '+' || b[0] == '-') && b[1] == 'n' && b[2] == 'a' && b[3] == 'n' {
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return math.NaN(), nil
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}
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cleaned, err := checkAndRemoveUnderscoresFloats(b)
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if err != nil {
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return 0, err
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}
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if cleaned[0] == '.' {
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return 0, unstable.NewParserError(b, "float cannot start with a dot")
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}
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if cleaned[len(cleaned)-1] == '.' {
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return 0, unstable.NewParserError(b, "float cannot end with a dot")
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}
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dotAlreadySeen := false
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for i, c := range cleaned {
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if c == '.' {
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if dotAlreadySeen {
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return 0, unstable.NewParserError(b[i:i+1], "float can have at most one decimal point")
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}
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if !isDigit(cleaned[i-1]) {
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return 0, unstable.NewParserError(b[i-1:i+1], "float decimal point must be preceded by a digit")
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}
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if !isDigit(cleaned[i+1]) {
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return 0, unstable.NewParserError(b[i:i+2], "float decimal point must be followed by a digit")
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}
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dotAlreadySeen = true
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}
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}
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start := 0
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if cleaned[0] == '+' || cleaned[0] == '-' {
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start = 1
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}
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if cleaned[start] == '0' && len(cleaned) > start+1 && isDigit(cleaned[start+1]) {
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return 0, unstable.NewParserError(b, "float integer part cannot have leading zeroes")
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}
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f, err := strconv.ParseFloat(string(cleaned), 64)
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if err != nil {
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return 0, unstable.NewParserError(b, "unable to parse float: %w", err)
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}
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return f, nil
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}
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func parseIntHex(b []byte) (int64, error) {
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cleaned, err := checkAndRemoveUnderscoresIntegers(b[2:])
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if err != nil {
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return 0, err
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}
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i, err := strconv.ParseInt(string(cleaned), 16, 64)
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if err != nil {
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return 0, unstable.NewParserError(b, "couldn't parse hexadecimal number: %w", err)
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}
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return i, nil
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}
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func parseIntOct(b []byte) (int64, error) {
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cleaned, err := checkAndRemoveUnderscoresIntegers(b[2:])
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if err != nil {
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return 0, err
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}
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i, err := strconv.ParseInt(string(cleaned), 8, 64)
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if err != nil {
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return 0, unstable.NewParserError(b, "couldn't parse octal number: %w", err)
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}
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return i, nil
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}
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func parseIntBin(b []byte) (int64, error) {
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cleaned, err := checkAndRemoveUnderscoresIntegers(b[2:])
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if err != nil {
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return 0, err
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}
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i, err := strconv.ParseInt(string(cleaned), 2, 64)
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if err != nil {
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return 0, unstable.NewParserError(b, "couldn't parse binary number: %w", err)
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}
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return i, nil
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}
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func isSign(b byte) bool {
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return b == '+' || b == '-'
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}
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func parseIntDec(b []byte) (int64, error) {
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cleaned, err := checkAndRemoveUnderscoresIntegers(b)
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if err != nil {
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return 0, err
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}
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startIdx := 0
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if isSign(cleaned[0]) {
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startIdx++
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}
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if len(cleaned) > startIdx+1 && cleaned[startIdx] == '0' {
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return 0, unstable.NewParserError(b, "leading zero not allowed on decimal number")
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}
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i, err := strconv.ParseInt(string(cleaned), 10, 64)
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if err != nil {
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return 0, unstable.NewParserError(b, "couldn't parse decimal number: %w", err)
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}
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return i, nil
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}
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func checkAndRemoveUnderscoresIntegers(b []byte) ([]byte, error) {
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start := 0
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if b[start] == '+' || b[start] == '-' {
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start++
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}
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if len(b) == start {
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return b, nil
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}
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if b[start] == '_' {
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return nil, unstable.NewParserError(b[start:start+1], "number cannot start with underscore")
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}
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if b[len(b)-1] == '_' {
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return nil, unstable.NewParserError(b[len(b)-1:], "number cannot end with underscore")
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}
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// fast path
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i := 0
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for ; i < len(b); i++ {
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if b[i] == '_' {
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break
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}
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}
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if i == len(b) {
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return b, nil
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}
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before := false
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cleaned := make([]byte, i, len(b))
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copy(cleaned, b)
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for i++; i < len(b); i++ {
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c := b[i]
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if c == '_' {
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if !before {
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return nil, unstable.NewParserError(b[i-1:i+1], "number must have at least one digit between underscores")
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}
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before = false
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} else {
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before = true
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cleaned = append(cleaned, c)
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}
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}
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return cleaned, nil
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}
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func checkAndRemoveUnderscoresFloats(b []byte) ([]byte, error) {
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if b[0] == '_' {
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return nil, unstable.NewParserError(b[0:1], "number cannot start with underscore")
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}
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if b[len(b)-1] == '_' {
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return nil, unstable.NewParserError(b[len(b)-1:], "number cannot end with underscore")
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}
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// fast path
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i := 0
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for ; i < len(b); i++ {
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if b[i] == '_' {
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break
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}
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}
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if i == len(b) {
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return b, nil
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}
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before := false
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cleaned := make([]byte, 0, len(b))
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for i := 0; i < len(b); i++ {
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c := b[i]
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switch c {
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case '_':
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if !before {
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return nil, unstable.NewParserError(b[i-1:i+1], "number must have at least one digit between underscores")
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}
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if i < len(b)-1 && (b[i+1] == 'e' || b[i+1] == 'E') {
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return nil, unstable.NewParserError(b[i+1:i+2], "cannot have underscore before exponent")
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}
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before = false
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case '+', '-':
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// signed exponents
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cleaned = append(cleaned, c)
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before = false
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case 'e', 'E':
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if i < len(b)-1 && b[i+1] == '_' {
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return nil, unstable.NewParserError(b[i+1:i+2], "cannot have underscore after exponent")
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}
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cleaned = append(cleaned, c)
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case '.':
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if i < len(b)-1 && b[i+1] == '_' {
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return nil, unstable.NewParserError(b[i+1:i+2], "cannot have underscore after decimal point")
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}
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if i > 0 && b[i-1] == '_' {
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return nil, unstable.NewParserError(b[i-1:i], "cannot have underscore before decimal point")
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}
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cleaned = append(cleaned, c)
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default:
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before = true
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cleaned = append(cleaned, c)
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}
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}
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return cleaned, nil
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}
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// isValidDate checks if a provided date is a date that exists.
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func isValidDate(year int, month int, day int) bool {
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return month > 0 && month < 13 && day > 0 && day <= daysIn(month, year)
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}
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// daysBefore[m] counts the number of days in a non-leap year
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// before month m begins. There is an entry for m=12, counting
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// the number of days before January of next year (365).
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var daysBefore = [...]int32{
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0,
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31,
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31 + 28,
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31 + 28 + 31,
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31 + 28 + 31 + 30,
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31 + 28 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31,
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}
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func daysIn(m int, year int) int {
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if m == 2 && isLeap(year) {
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return 29
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}
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return int(daysBefore[m] - daysBefore[m-1])
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}
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func isLeap(year int) bool {
|
|
return year%4 == 0 && (year%100 != 0 || year%400 == 0)
|
|
}
|
|
|
|
func isDigit(r byte) bool {
|
|
return r >= '0' && r <= '9'
|
|
}
|