mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-14 05:21:08 +00:00
550 lines
12 KiB
Go
550 lines
12 KiB
Go
package toml
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
"strconv"
|
|
"time"
|
|
|
|
"github.com/pelletier/go-toml/v2/unstable"
|
|
)
|
|
|
|
func parseInteger(b []byte) (int64, error) {
|
|
if len(b) > 2 && b[0] == '0' {
|
|
switch b[1] {
|
|
case 'x':
|
|
return parseIntHex(b)
|
|
case 'b':
|
|
return parseIntBin(b)
|
|
case 'o':
|
|
return parseIntOct(b)
|
|
default:
|
|
panic(fmt.Errorf("invalid base '%c', should have been checked by scanIntOrFloat", b[1]))
|
|
}
|
|
}
|
|
|
|
return parseIntDec(b)
|
|
}
|
|
|
|
func parseLocalDate(b []byte) (LocalDate, error) {
|
|
// full-date = date-fullyear "-" date-month "-" date-mday
|
|
// date-fullyear = 4DIGIT
|
|
// date-month = 2DIGIT ; 01-12
|
|
// date-mday = 2DIGIT ; 01-28, 01-29, 01-30, 01-31 based on month/year
|
|
var date LocalDate
|
|
|
|
if len(b) != 10 || b[4] != '-' || b[7] != '-' {
|
|
return date, unstable.NewParserError(b, "dates are expected to have the format YYYY-MM-DD")
|
|
}
|
|
|
|
var err error
|
|
|
|
date.Year, err = parseDecimalDigits(b[0:4])
|
|
if err != nil {
|
|
return LocalDate{}, err
|
|
}
|
|
|
|
date.Month, err = parseDecimalDigits(b[5:7])
|
|
if err != nil {
|
|
return LocalDate{}, err
|
|
}
|
|
|
|
date.Day, err = parseDecimalDigits(b[8:10])
|
|
if err != nil {
|
|
return LocalDate{}, err
|
|
}
|
|
|
|
if !isValidDate(date.Year, date.Month, date.Day) {
|
|
return LocalDate{}, unstable.NewParserError(b, "impossible date")
|
|
}
|
|
|
|
return date, nil
|
|
}
|
|
|
|
func parseDecimalDigits(b []byte) (int, error) {
|
|
v := 0
|
|
|
|
for i, c := range b {
|
|
if c < '0' || c > '9' {
|
|
return 0, unstable.NewParserError(b[i:i+1], "expected digit (0-9)")
|
|
}
|
|
v *= 10
|
|
v += int(c - '0')
|
|
}
|
|
|
|
return v, nil
|
|
}
|
|
|
|
func parseDateTime(b []byte) (time.Time, error) {
|
|
// offset-date-time = full-date time-delim full-time
|
|
// full-time = partial-time time-offset
|
|
// time-offset = "Z" / time-numoffset
|
|
// time-numoffset = ( "+" / "-" ) time-hour ":" time-minute
|
|
|
|
dt, b, err := parseLocalDateTime(b)
|
|
if err != nil {
|
|
return time.Time{}, err
|
|
}
|
|
|
|
var zone *time.Location
|
|
|
|
if len(b) == 0 {
|
|
// parser should have checked that when assigning the date time node
|
|
panic("date time should have a timezone")
|
|
}
|
|
|
|
if b[0] == 'Z' || b[0] == 'z' {
|
|
b = b[1:]
|
|
zone = time.UTC
|
|
} else {
|
|
const dateTimeByteLen = 6
|
|
if len(b) != dateTimeByteLen {
|
|
return time.Time{}, unstable.NewParserError(b, "invalid date-time timezone")
|
|
}
|
|
var direction int
|
|
switch b[0] {
|
|
case '-':
|
|
direction = -1
|
|
case '+':
|
|
direction = +1
|
|
default:
|
|
return time.Time{}, unstable.NewParserError(b[:1], "invalid timezone offset character")
|
|
}
|
|
|
|
if b[3] != ':' {
|
|
return time.Time{}, unstable.NewParserError(b[3:4], "expected a : separator")
|
|
}
|
|
|
|
hours, err := parseDecimalDigits(b[1:3])
|
|
if err != nil {
|
|
return time.Time{}, err
|
|
}
|
|
if hours > 23 {
|
|
return time.Time{}, unstable.NewParserError(b[:1], "invalid timezone offset hours")
|
|
}
|
|
|
|
minutes, err := parseDecimalDigits(b[4:6])
|
|
if err != nil {
|
|
return time.Time{}, err
|
|
}
|
|
if minutes > 59 {
|
|
return time.Time{}, unstable.NewParserError(b[:1], "invalid timezone offset minutes")
|
|
}
|
|
|
|
seconds := direction * (hours*3600 + minutes*60)
|
|
if seconds == 0 {
|
|
zone = time.UTC
|
|
} else {
|
|
zone = time.FixedZone("", seconds)
|
|
}
|
|
b = b[dateTimeByteLen:]
|
|
}
|
|
|
|
if len(b) > 0 {
|
|
return time.Time{}, unstable.NewParserError(b, "extra bytes at the end of the timezone")
|
|
}
|
|
|
|
t := time.Date(
|
|
dt.Year,
|
|
time.Month(dt.Month),
|
|
dt.Day,
|
|
dt.Hour,
|
|
dt.Minute,
|
|
dt.Second,
|
|
dt.Nanosecond,
|
|
zone)
|
|
|
|
return t, nil
|
|
}
|
|
|
|
func parseLocalDateTime(b []byte) (LocalDateTime, []byte, error) {
|
|
var dt LocalDateTime
|
|
|
|
const localDateTimeByteMinLen = 11
|
|
if len(b) < localDateTimeByteMinLen {
|
|
return dt, nil, unstable.NewParserError(b, "local datetimes are expected to have the format YYYY-MM-DDTHH:MM:SS[.NNNNNNNNN]")
|
|
}
|
|
|
|
date, err := parseLocalDate(b[:10])
|
|
if err != nil {
|
|
return dt, nil, err
|
|
}
|
|
dt.LocalDate = date
|
|
|
|
sep := b[10]
|
|
if sep != 'T' && sep != ' ' && sep != 't' {
|
|
return dt, nil, unstable.NewParserError(b[10:11], "datetime separator is expected to be T or a space")
|
|
}
|
|
|
|
t, rest, err := parseLocalTime(b[11:])
|
|
if err != nil {
|
|
return dt, nil, err
|
|
}
|
|
dt.LocalTime = t
|
|
|
|
return dt, rest, nil
|
|
}
|
|
|
|
// parseLocalTime is a bit different because it also returns the remaining
|
|
// []byte that is didn't need. This is to allow parseDateTime to parse those
|
|
// remaining bytes as a timezone.
|
|
func parseLocalTime(b []byte) (LocalTime, []byte, error) {
|
|
var (
|
|
nspow = [10]int{0, 1e8, 1e7, 1e6, 1e5, 1e4, 1e3, 1e2, 1e1, 1e0}
|
|
t LocalTime
|
|
)
|
|
|
|
// check if b matches to have expected format HH:MM:SS[.NNNNNN]
|
|
const localTimeByteLen = 8
|
|
if len(b) < localTimeByteLen {
|
|
return t, nil, unstable.NewParserError(b, "times are expected to have the format HH:MM:SS[.NNNNNN]")
|
|
}
|
|
|
|
var err error
|
|
|
|
t.Hour, err = parseDecimalDigits(b[0:2])
|
|
if err != nil {
|
|
return t, nil, err
|
|
}
|
|
|
|
if t.Hour > 23 {
|
|
return t, nil, unstable.NewParserError(b[0:2], "hour cannot be greater 23")
|
|
}
|
|
if b[2] != ':' {
|
|
return t, nil, unstable.NewParserError(b[2:3], "expecting colon between hours and minutes")
|
|
}
|
|
|
|
t.Minute, err = parseDecimalDigits(b[3:5])
|
|
if err != nil {
|
|
return t, nil, err
|
|
}
|
|
if t.Minute > 59 {
|
|
return t, nil, unstable.NewParserError(b[3:5], "minutes cannot be greater 59")
|
|
}
|
|
if b[5] != ':' {
|
|
return t, nil, unstable.NewParserError(b[5:6], "expecting colon between minutes and seconds")
|
|
}
|
|
|
|
t.Second, err = parseDecimalDigits(b[6:8])
|
|
if err != nil {
|
|
return t, nil, err
|
|
}
|
|
|
|
if t.Second > 60 {
|
|
return t, nil, unstable.NewParserError(b[6:8], "seconds cannot be greater 60")
|
|
}
|
|
|
|
b = b[8:]
|
|
|
|
if len(b) >= 1 && b[0] == '.' {
|
|
frac := 0
|
|
precision := 0
|
|
digits := 0
|
|
|
|
for i, c := range b[1:] {
|
|
if !isDigit(c) {
|
|
if i == 0 {
|
|
return t, nil, unstable.NewParserError(b[0:1], "need at least one digit after fraction point")
|
|
}
|
|
break
|
|
}
|
|
digits++
|
|
|
|
const maxFracPrecision = 9
|
|
if i >= maxFracPrecision {
|
|
// go-toml allows decoding fractional seconds
|
|
// beyond the supported precision of 9
|
|
// digits. It truncates the fractional component
|
|
// to the supported precision and ignores the
|
|
// remaining digits.
|
|
//
|
|
// https://github.com/pelletier/go-toml/discussions/707
|
|
continue
|
|
}
|
|
|
|
frac *= 10
|
|
frac += int(c - '0')
|
|
precision++
|
|
}
|
|
|
|
if precision == 0 {
|
|
return t, nil, unstable.NewParserError(b[:1], "nanoseconds need at least one digit")
|
|
}
|
|
|
|
t.Nanosecond = frac * nspow[precision]
|
|
t.Precision = precision
|
|
|
|
return t, b[1+digits:], nil
|
|
}
|
|
return t, b, nil
|
|
}
|
|
|
|
//nolint:cyclop
|
|
func parseFloat(b []byte) (float64, error) {
|
|
if len(b) == 4 && (b[0] == '+' || b[0] == '-') && b[1] == 'n' && b[2] == 'a' && b[3] == 'n' {
|
|
return math.NaN(), nil
|
|
}
|
|
|
|
cleaned, err := checkAndRemoveUnderscoresFloats(b)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
if cleaned[0] == '.' {
|
|
return 0, unstable.NewParserError(b, "float cannot start with a dot")
|
|
}
|
|
|
|
if cleaned[len(cleaned)-1] == '.' {
|
|
return 0, unstable.NewParserError(b, "float cannot end with a dot")
|
|
}
|
|
|
|
dotAlreadySeen := false
|
|
for i, c := range cleaned {
|
|
if c == '.' {
|
|
if dotAlreadySeen {
|
|
return 0, unstable.NewParserError(b[i:i+1], "float can have at most one decimal point")
|
|
}
|
|
if !isDigit(cleaned[i-1]) {
|
|
return 0, unstable.NewParserError(b[i-1:i+1], "float decimal point must be preceded by a digit")
|
|
}
|
|
if !isDigit(cleaned[i+1]) {
|
|
return 0, unstable.NewParserError(b[i:i+2], "float decimal point must be followed by a digit")
|
|
}
|
|
dotAlreadySeen = true
|
|
}
|
|
}
|
|
|
|
start := 0
|
|
if cleaned[0] == '+' || cleaned[0] == '-' {
|
|
start = 1
|
|
}
|
|
if cleaned[start] == '0' && len(cleaned) > start+1 && isDigit(cleaned[start+1]) {
|
|
return 0, unstable.NewParserError(b, "float integer part cannot have leading zeroes")
|
|
}
|
|
|
|
f, err := strconv.ParseFloat(string(cleaned), 64)
|
|
if err != nil {
|
|
return 0, unstable.NewParserError(b, "unable to parse float: %w", err)
|
|
}
|
|
|
|
return f, nil
|
|
}
|
|
|
|
func parseIntHex(b []byte) (int64, error) {
|
|
cleaned, err := checkAndRemoveUnderscoresIntegers(b[2:])
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
i, err := strconv.ParseInt(string(cleaned), 16, 64)
|
|
if err != nil {
|
|
return 0, unstable.NewParserError(b, "couldn't parse hexadecimal number: %w", err)
|
|
}
|
|
|
|
return i, nil
|
|
}
|
|
|
|
func parseIntOct(b []byte) (int64, error) {
|
|
cleaned, err := checkAndRemoveUnderscoresIntegers(b[2:])
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
i, err := strconv.ParseInt(string(cleaned), 8, 64)
|
|
if err != nil {
|
|
return 0, unstable.NewParserError(b, "couldn't parse octal number: %w", err)
|
|
}
|
|
|
|
return i, nil
|
|
}
|
|
|
|
func parseIntBin(b []byte) (int64, error) {
|
|
cleaned, err := checkAndRemoveUnderscoresIntegers(b[2:])
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
i, err := strconv.ParseInt(string(cleaned), 2, 64)
|
|
if err != nil {
|
|
return 0, unstable.NewParserError(b, "couldn't parse binary number: %w", err)
|
|
}
|
|
|
|
return i, nil
|
|
}
|
|
|
|
func isSign(b byte) bool {
|
|
return b == '+' || b == '-'
|
|
}
|
|
|
|
func parseIntDec(b []byte) (int64, error) {
|
|
cleaned, err := checkAndRemoveUnderscoresIntegers(b)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
startIdx := 0
|
|
|
|
if isSign(cleaned[0]) {
|
|
startIdx++
|
|
}
|
|
|
|
if len(cleaned) > startIdx+1 && cleaned[startIdx] == '0' {
|
|
return 0, unstable.NewParserError(b, "leading zero not allowed on decimal number")
|
|
}
|
|
|
|
i, err := strconv.ParseInt(string(cleaned), 10, 64)
|
|
if err != nil {
|
|
return 0, unstable.NewParserError(b, "couldn't parse decimal number: %w", err)
|
|
}
|
|
|
|
return i, nil
|
|
}
|
|
|
|
func checkAndRemoveUnderscoresIntegers(b []byte) ([]byte, error) {
|
|
start := 0
|
|
if b[start] == '+' || b[start] == '-' {
|
|
start++
|
|
}
|
|
|
|
if len(b) == start {
|
|
return b, nil
|
|
}
|
|
|
|
if b[start] == '_' {
|
|
return nil, unstable.NewParserError(b[start:start+1], "number cannot start with underscore")
|
|
}
|
|
|
|
if b[len(b)-1] == '_' {
|
|
return nil, unstable.NewParserError(b[len(b)-1:], "number cannot end with underscore")
|
|
}
|
|
|
|
// fast path
|
|
i := 0
|
|
for ; i < len(b); i++ {
|
|
if b[i] == '_' {
|
|
break
|
|
}
|
|
}
|
|
if i == len(b) {
|
|
return b, nil
|
|
}
|
|
|
|
before := false
|
|
cleaned := make([]byte, i, len(b))
|
|
copy(cleaned, b)
|
|
|
|
for i++; i < len(b); i++ {
|
|
c := b[i]
|
|
if c == '_' {
|
|
if !before {
|
|
return nil, unstable.NewParserError(b[i-1:i+1], "number must have at least one digit between underscores")
|
|
}
|
|
before = false
|
|
} else {
|
|
before = true
|
|
cleaned = append(cleaned, c)
|
|
}
|
|
}
|
|
|
|
return cleaned, nil
|
|
}
|
|
|
|
func checkAndRemoveUnderscoresFloats(b []byte) ([]byte, error) {
|
|
if b[0] == '_' {
|
|
return nil, unstable.NewParserError(b[0:1], "number cannot start with underscore")
|
|
}
|
|
|
|
if b[len(b)-1] == '_' {
|
|
return nil, unstable.NewParserError(b[len(b)-1:], "number cannot end with underscore")
|
|
}
|
|
|
|
// fast path
|
|
i := 0
|
|
for ; i < len(b); i++ {
|
|
if b[i] == '_' {
|
|
break
|
|
}
|
|
}
|
|
if i == len(b) {
|
|
return b, nil
|
|
}
|
|
|
|
before := false
|
|
cleaned := make([]byte, 0, len(b))
|
|
|
|
for i := 0; i < len(b); i++ {
|
|
c := b[i]
|
|
|
|
switch c {
|
|
case '_':
|
|
if !before {
|
|
return nil, unstable.NewParserError(b[i-1:i+1], "number must have at least one digit between underscores")
|
|
}
|
|
if i < len(b)-1 && (b[i+1] == 'e' || b[i+1] == 'E') {
|
|
return nil, unstable.NewParserError(b[i+1:i+2], "cannot have underscore before exponent")
|
|
}
|
|
before = false
|
|
case '+', '-':
|
|
// signed exponents
|
|
cleaned = append(cleaned, c)
|
|
before = false
|
|
case 'e', 'E':
|
|
if i < len(b)-1 && b[i+1] == '_' {
|
|
return nil, unstable.NewParserError(b[i+1:i+2], "cannot have underscore after exponent")
|
|
}
|
|
cleaned = append(cleaned, c)
|
|
case '.':
|
|
if i < len(b)-1 && b[i+1] == '_' {
|
|
return nil, unstable.NewParserError(b[i+1:i+2], "cannot have underscore after decimal point")
|
|
}
|
|
if i > 0 && b[i-1] == '_' {
|
|
return nil, unstable.NewParserError(b[i-1:i], "cannot have underscore before decimal point")
|
|
}
|
|
cleaned = append(cleaned, c)
|
|
default:
|
|
before = true
|
|
cleaned = append(cleaned, c)
|
|
}
|
|
}
|
|
|
|
return cleaned, nil
|
|
}
|
|
|
|
// isValidDate checks if a provided date is a date that exists.
|
|
func isValidDate(year int, month int, day int) bool {
|
|
return month > 0 && month < 13 && day > 0 && day <= daysIn(month, year)
|
|
}
|
|
|
|
// 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 daysIn(m int, year int) int {
|
|
if m == 2 && isLeap(year) {
|
|
return 29
|
|
}
|
|
return int(daysBefore[m] - daysBefore[m-1])
|
|
}
|
|
|
|
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'
|
|
}
|