mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-24 11:12:11 +00:00
b56dae8120
* update all but bun libraries Signed-off-by: kim <grufwub@gmail.com> * remove my personal build script changes Signed-off-by: kim <grufwub@gmail.com>
487 lines
15 KiB
Go
487 lines
15 KiB
Go
package parse
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"strconv"
|
|
"unicode"
|
|
)
|
|
|
|
// Copy returns a copy of the given byte slice.
|
|
func Copy(src []byte) (dst []byte) {
|
|
dst = make([]byte, len(src))
|
|
copy(dst, src)
|
|
return
|
|
}
|
|
|
|
// ToLower converts all characters in the byte slice from A-Z to a-z.
|
|
func ToLower(src []byte) []byte {
|
|
for i, c := range src {
|
|
if c >= 'A' && c <= 'Z' {
|
|
src[i] = c + ('a' - 'A')
|
|
}
|
|
}
|
|
return src
|
|
}
|
|
|
|
// EqualFold returns true when s matches case-insensitively the targetLower (which must be lowercase).
|
|
func EqualFold(s, targetLower []byte) bool {
|
|
if len(s) != len(targetLower) {
|
|
return false
|
|
}
|
|
for i, c := range targetLower {
|
|
d := s[i]
|
|
if d != c && (d < 'A' || d > 'Z' || d+('a'-'A') != c) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Printable returns a printable string for given rune
|
|
func Printable(r rune) string {
|
|
if unicode.IsGraphic(r) {
|
|
return fmt.Sprintf("%c", r)
|
|
} else if r < 128 {
|
|
return fmt.Sprintf("0x%02X", r)
|
|
}
|
|
return fmt.Sprintf("%U", r)
|
|
}
|
|
|
|
var whitespaceTable = [256]bool{
|
|
// ASCII
|
|
false, false, false, false, false, false, false, false,
|
|
false, true, true, false, true, true, false, false, // tab, new line, form feed, carriage return
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
true, false, false, false, false, false, false, false, // space
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
// non-ASCII
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
}
|
|
|
|
// IsWhitespace returns true for space, \n, \r, \t, \f.
|
|
func IsWhitespace(c byte) bool {
|
|
return whitespaceTable[c]
|
|
}
|
|
|
|
var newlineTable = [256]bool{
|
|
// ASCII
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, true, false, false, true, false, false, // new line, carriage return
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
// non-ASCII
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
}
|
|
|
|
// IsNewline returns true for \n, \r.
|
|
func IsNewline(c byte) bool {
|
|
return newlineTable[c]
|
|
}
|
|
|
|
// IsAllWhitespace returns true when the entire byte slice consists of space, \n, \r, \t, \f.
|
|
func IsAllWhitespace(b []byte) bool {
|
|
for _, c := range b {
|
|
if !IsWhitespace(c) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// TrimWhitespace removes any leading and trailing whitespace characters.
|
|
func TrimWhitespace(b []byte) []byte {
|
|
n := len(b)
|
|
start := n
|
|
for i := 0; i < n; i++ {
|
|
if !IsWhitespace(b[i]) {
|
|
start = i
|
|
break
|
|
}
|
|
}
|
|
end := n
|
|
for i := n - 1; i >= start; i-- {
|
|
if !IsWhitespace(b[i]) {
|
|
end = i + 1
|
|
break
|
|
}
|
|
}
|
|
return b[start:end]
|
|
}
|
|
|
|
// ReplaceMultipleWhitespace replaces character series of space, \n, \t, \f, \r into a single space or newline (when the serie contained a \n or \r).
|
|
func ReplaceMultipleWhitespace(b []byte) []byte {
|
|
j, k := 0, 0 // j is write position, k is start of next text section
|
|
for i := 0; i < len(b); i++ {
|
|
if IsWhitespace(b[i]) {
|
|
start := i
|
|
newline := IsNewline(b[i])
|
|
i++
|
|
for ; i < len(b) && IsWhitespace(b[i]); i++ {
|
|
if IsNewline(b[i]) {
|
|
newline = true
|
|
}
|
|
}
|
|
if newline {
|
|
b[start] = '\n'
|
|
} else {
|
|
b[start] = ' '
|
|
}
|
|
if 1 < i-start { // more than one whitespace
|
|
if j == 0 {
|
|
j = start + 1
|
|
} else {
|
|
j += copy(b[j:], b[k:start+1])
|
|
}
|
|
k = i
|
|
}
|
|
}
|
|
}
|
|
if j == 0 {
|
|
return b
|
|
} else if j == 1 { // only if starts with whitespace
|
|
b[k-1] = b[0]
|
|
return b[k-1:]
|
|
} else if k < len(b) {
|
|
j += copy(b[j:], b[k:])
|
|
}
|
|
return b[:j]
|
|
}
|
|
|
|
// replaceEntities will replace in b at index i, assuming that b[i] == '&' and that i+3<len(b). The returned int will be the last character of the entity, so that the next iteration can safely do i++ to continue and not miss any entitites.
|
|
func replaceEntities(b []byte, i int, entitiesMap map[string][]byte, revEntitiesMap map[byte][]byte) ([]byte, int) {
|
|
const MaxEntityLength = 31 // longest HTML entity: CounterClockwiseContourIntegral
|
|
var r []byte
|
|
j := i + 1
|
|
if b[j] == '#' {
|
|
j++
|
|
if b[j] == 'x' {
|
|
j++
|
|
c := 0
|
|
for ; j < len(b) && (b[j] >= '0' && b[j] <= '9' || b[j] >= 'a' && b[j] <= 'f' || b[j] >= 'A' && b[j] <= 'F'); j++ {
|
|
if b[j] <= '9' {
|
|
c = c<<4 + int(b[j]-'0')
|
|
} else if b[j] <= 'F' {
|
|
c = c<<4 + int(b[j]-'A') + 10
|
|
} else if b[j] <= 'f' {
|
|
c = c<<4 + int(b[j]-'a') + 10
|
|
}
|
|
}
|
|
if j <= i+3 || 10000 <= c {
|
|
return b, j - 1
|
|
}
|
|
if c < 128 {
|
|
r = []byte{byte(c)}
|
|
} else {
|
|
r = append(r, '&', '#')
|
|
r = strconv.AppendInt(r, int64(c), 10)
|
|
r = append(r, ';')
|
|
}
|
|
} else {
|
|
c := 0
|
|
for ; j < len(b) && c < 128 && b[j] >= '0' && b[j] <= '9'; j++ {
|
|
c = c*10 + int(b[j]-'0')
|
|
}
|
|
if j <= i+2 || 128 <= c {
|
|
return b, j - 1
|
|
}
|
|
r = []byte{byte(c)}
|
|
}
|
|
} else {
|
|
for ; j < len(b) && j-i-1 <= MaxEntityLength && b[j] != ';'; j++ {
|
|
}
|
|
if j <= i+1 || len(b) <= j {
|
|
return b, j - 1
|
|
}
|
|
|
|
var ok bool
|
|
r, ok = entitiesMap[string(b[i+1:j])]
|
|
if !ok {
|
|
return b, j
|
|
}
|
|
}
|
|
|
|
// j is at semicolon
|
|
n := j + 1 - i
|
|
if j < len(b) && b[j] == ';' && 2 < n {
|
|
if len(r) == 1 {
|
|
if q, ok := revEntitiesMap[r[0]]; ok {
|
|
if len(q) == len(b[i:j+1]) && bytes.Equal(q, b[i:j+1]) {
|
|
return b, j
|
|
}
|
|
r = q
|
|
} else if r[0] == '&' {
|
|
// check if for example & is followed by something that could potentially be an entity
|
|
k := j + 1
|
|
if k < len(b) && b[k] == '#' {
|
|
k++
|
|
}
|
|
for ; k < len(b) && k-j <= MaxEntityLength && (b[k] >= '0' && b[k] <= '9' || b[k] >= 'a' && b[k] <= 'z' || b[k] >= 'A' && b[k] <= 'Z'); k++ {
|
|
}
|
|
if k < len(b) && b[k] == ';' {
|
|
return b, k
|
|
}
|
|
}
|
|
}
|
|
|
|
copy(b[i:], r)
|
|
copy(b[i+len(r):], b[j+1:])
|
|
b = b[:len(b)-n+len(r)]
|
|
return b, i + len(r) - 1
|
|
}
|
|
return b, i
|
|
}
|
|
|
|
// ReplaceEntities replaces all occurrences of entites (such as ") to their respective unencoded bytes.
|
|
func ReplaceEntities(b []byte, entitiesMap map[string][]byte, revEntitiesMap map[byte][]byte) []byte {
|
|
for i := 0; i < len(b); i++ {
|
|
if b[i] == '&' && i+3 < len(b) {
|
|
b, i = replaceEntities(b, i, entitiesMap, revEntitiesMap)
|
|
}
|
|
}
|
|
return b
|
|
}
|
|
|
|
// ReplaceMultipleWhitespaceAndEntities is a combination of ReplaceMultipleWhitespace and ReplaceEntities. It is faster than executing both sequentially.
|
|
func ReplaceMultipleWhitespaceAndEntities(b []byte, entitiesMap map[string][]byte, revEntitiesMap map[byte][]byte) []byte {
|
|
j, k := 0, 0 // j is write position, k is start of next text section
|
|
for i := 0; i < len(b); i++ {
|
|
if IsWhitespace(b[i]) {
|
|
start := i
|
|
newline := IsNewline(b[i])
|
|
i++
|
|
for ; i < len(b) && IsWhitespace(b[i]); i++ {
|
|
if IsNewline(b[i]) {
|
|
newline = true
|
|
}
|
|
}
|
|
if newline {
|
|
b[start] = '\n'
|
|
} else {
|
|
b[start] = ' '
|
|
}
|
|
if 1 < i-start { // more than one whitespace
|
|
if j == 0 {
|
|
j = start + 1
|
|
} else {
|
|
j += copy(b[j:], b[k:start+1])
|
|
}
|
|
k = i
|
|
}
|
|
}
|
|
if i+3 < len(b) && b[i] == '&' {
|
|
b, i = replaceEntities(b, i, entitiesMap, revEntitiesMap)
|
|
}
|
|
}
|
|
if j == 0 {
|
|
return b
|
|
} else if j == 1 { // only if starts with whitespace
|
|
b[k-1] = b[0]
|
|
return b[k-1:]
|
|
} else if k < len(b) {
|
|
j += copy(b[j:], b[k:])
|
|
}
|
|
return b[:j]
|
|
}
|
|
|
|
// URLEncodingTable is a charmap for which characters need escaping in the URL encoding scheme
|
|
var URLEncodingTable = [256]bool{
|
|
// ASCII
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
|
|
true, false, true, true, true, true, true, false, // space, ", #, $, %, &
|
|
false, false, false, true, true, false, false, true, // +, comma, /
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, true, true, true, true, true, true, // :, ;, <, =, >, ?
|
|
|
|
true, false, false, false, false, false, false, false, // @
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, true, true, true, true, false, // [, \, ], ^
|
|
|
|
true, false, false, false, false, false, false, false, // `
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, true, true, true, false, true, // {, |, }, DEL
|
|
|
|
// non-ASCII
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
}
|
|
|
|
// DataURIEncodingTable is a charmap for which characters need escaping in the Data URI encoding scheme
|
|
// Escape only non-printable characters, unicode and %, #, &.
|
|
// IE11 additionally requires encoding of \, [, ], ", <, >, `, {, }, |, ^ which is not required by Chrome, Firefox, Opera, Edge, Safari, Yandex
|
|
// To pass the HTML validator, restricted URL characters must be escaped: non-printable characters, space, <, >, #, %, "
|
|
var DataURIEncodingTable = [256]bool{
|
|
// ASCII
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
|
|
true, false, true, true, false, true, true, false, // space, ", #, %, &
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, true, false, true, false, // <, >
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, true, true, true, true, false, // [, \, ], ^
|
|
|
|
true, false, false, false, false, false, false, false, // `
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, true, true, true, false, true, // {, |, }, DEL
|
|
|
|
// non-ASCII
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
true, true, true, true, true, true, true, true,
|
|
}
|
|
|
|
// EncodeURL encodes bytes using the URL encoding scheme
|
|
func EncodeURL(b []byte, table [256]bool) []byte {
|
|
for i := 0; i < len(b); i++ {
|
|
c := b[i]
|
|
if table[c] {
|
|
b = append(b, 0, 0)
|
|
copy(b[i+3:], b[i+1:])
|
|
b[i+0] = '%'
|
|
b[i+1] = "0123456789ABCDEF"[c>>4]
|
|
b[i+2] = "0123456789ABCDEF"[c&15]
|
|
}
|
|
}
|
|
return b
|
|
}
|
|
|
|
// DecodeURL decodes an URL encoded using the URL encoding scheme
|
|
func DecodeURL(b []byte) []byte {
|
|
for i := 0; i < len(b); i++ {
|
|
if b[i] == '%' && i+2 < len(b) {
|
|
j := i + 1
|
|
c := 0
|
|
for ; j < i+3 && (b[j] >= '0' && b[j] <= '9' || b[j] >= 'a' && b[j] <= 'f' || b[j] >= 'A' && b[j] <= 'F'); j++ {
|
|
if b[j] <= '9' {
|
|
c = c<<4 + int(b[j]-'0')
|
|
} else if b[j] <= 'F' {
|
|
c = c<<4 + int(b[j]-'A') + 10
|
|
} else if b[j] <= 'f' {
|
|
c = c<<4 + int(b[j]-'a') + 10
|
|
}
|
|
}
|
|
if j == i+3 && c < 128 {
|
|
b[i] = byte(c)
|
|
b = append(b[:i+1], b[i+3:]...)
|
|
}
|
|
} else if b[i] == '+' {
|
|
b[i] = ' '
|
|
}
|
|
}
|
|
return b
|
|
}
|