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GoToSocial/vendor/github.com/tdewolff/parse/v2/util.go

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[bugfix] Markdown formatting updates (#743) * add minify dependency specifically for markdown * rearrange markdown formatting * update markdown tests
2022-08-07 18:19:16 +02:00
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 &amp; is followed by something that could potentially be an entity
k := j + 1
[chore]: Bump github.com/tdewolff/minify/v2 from 2.12.4 to 2.12.5 (#1649) Bumps [github.com/tdewolff/minify/v2](https://github.com/tdewolff/minify) from 2.12.4 to 2.12.5. - [Release notes](https://github.com/tdewolff/minify/releases) - [Commits](https://github.com/tdewolff/minify/compare/v2.12.4...v2.12.5) --- updated-dependencies: - dependency-name: github.com/tdewolff/minify/v2 dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
2023-03-27 15:59:57 +02:00
if k < len(b) && (b[k] >= '0' && b[k] <= '9' || b[k] >= 'a' && b[k] <= 'z' || b[k] >= 'A' && b[k] <= 'Z' || b[k] == '#') {
[bugfix] Markdown formatting updates (#743) * add minify dependency specifically for markdown * rearrange markdown formatting * update markdown tests
2022-08-07 18:19:16 +02:00
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 &quot;) 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
}