Function indexFold

modules/caddyhttp/fileserver/matcher.go:596–604

There is no strings.IndexFold() function like there is strings.EqualFold(), but we can use strings.EqualFold() to build our own case-insensitive substring search (as of Go 1.14).

(haystack, needle string)

// but we can use strings.EqualFold() to build our own case-insensitive
// substring search (as of Go 1.14).
func indexFold(haystack, needle string) int {
	nlen := len(needle)
	for i := 0; i+nlen < len(haystack); i++ {
		if strings.EqualFold(haystack[i:i+nlen], needle) {
			return i
		}
	}
	return -1
}

// isCELTryFilesLiteral returns whether the expression resolves to a map literal containing
// only string keys with or a placeholder call.