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package strings
import "unicode/utf8"
// IndexNotByte is similar with strings.IndexByte but showing the opposite behavior.
func IndexNotByte(s string, c byte) int {
n := len(s)
for i := 0; i < n; i++ {
if s[i] != c {
return i
}
}
return -1
}
// LastIndexNotByte is similar with strings.LastIndexByte but showing the opposite behavior.
func LastIndexNotByte(s string, c byte) int {
for i := len(s) - 1; i >= 0; i-- {
if s[i] != c {
return i
}
}
return -1
}
type asciiSet [8]uint32
func (as *asciiSet) notContains(c byte) bool {
return (as[c>>5] & (1 << uint(c&31))) == 0
}
func makeASCIISet(chars string) (as asciiSet, ok bool) {
for i := 0; i < len(chars); i++ {
c := chars[i]
if c >= utf8.RuneSelf {
return as, false
}
as[c>>5] |= 1 << uint(c&31)
}
return as, true
}
// IndexNotAny is similar with strings.IndexAny but showing the opposite behavior.
func IndexNotAny(s, chars string) int {
if len(chars) > 0 {
if len(s) > 8 {
if as, isASCII := makeASCIISet(chars); isASCII {
for i := 0; i < len(s); i++ {
if as.notContains(s[i]) {
return i
}
}
return -1
}
}
LabelFirstLoop:
for i, c := range s {
for j, m := range chars {
if c != m && j == len(chars)-1 {
return i
} else if c != m {
continue
} else {
continue LabelFirstLoop
}
}
}
}
return -1
}
// LastIndexNotAny is similar with strings.LastIndexAny but showing the opposite behavior.
func LastIndexNotAny(s, chars string) int {
if len(chars) > 0 {
if len(s) > 8 {
if as, isASCII := makeASCIISet(chars); isASCII {
for i := len(s) - 1; i >= 0; i-- {
if as.notContains(s[i]) {
return i
}
}
return -1
}
}
LabelFirstLoop:
for i := len(s); i > 0; {
r, size := utf8.DecodeLastRuneInString(s[:i])
i -= size
for j, m := range chars {
if r != m && j == len(chars)-1 {
return i
} else if r != m {
continue
} else {
continue LabelFirstLoop
}
}
}
}
return -1
}
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