// lastIndexFunc is the same as LastIndexFunc except that if
// truth==false, the sense of the predicate function is
// inverted.
func lastIndexFunc(s string, f func(rune) bool, truth bool) int {
for i := len(s); i > 0; {
r, size := utf8.DecodeLastRuneInString(s[0:i])
i -= size
if f(r) == truth {
return i
}
}
return -1
}
func (i *inputString) context(pos int) syntax.EmptyOp {
r1, r2 := endOfText, endOfText
if pos > 0 && pos <= len(i.str) {
r1, _ = utf8.DecodeLastRuneInString(i.str[:pos])
}
if pos < len(i.str) {
r2, _ = utf8.DecodeRuneInString(i.str[pos:])
}
return syntax.EmptyOpContext(r1, r2)
}
// LastIndexAny returns the index of the last instance of any Unicode code
// point from chars in s, or -1 if no Unicode code point from chars is
// present in s.
func LastIndexAny(s, chars string) int {
if len(chars) > 0 {
for i := len(s); i > 0; {
rune, size := utf8.DecodeLastRuneInString(s[0:i])
i -= size
for _, m := range chars {
if rune == m {
return i
}
}
}
}
return -1
}