70 lines
1.4 KiB
Go
70 lines
1.4 KiB
Go
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package svchost
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import (
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"strings"
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)
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// A labelIter allows iterating over domain name labels.
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//
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// This type is copied from golang.org/x/net/idna, where it is used
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// to segment hostnames into their separate labels for analysis. We use
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// it for the same purpose here, in ForComparison.
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type labelIter struct {
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orig string
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slice []string
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curStart int
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curEnd int
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i int
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}
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func (l *labelIter) reset() {
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l.curStart = 0
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l.curEnd = 0
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l.i = 0
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}
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func (l *labelIter) done() bool {
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return l.curStart >= len(l.orig)
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}
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func (l *labelIter) result() string {
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if l.slice != nil {
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return strings.Join(l.slice, ".")
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}
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return l.orig
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}
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func (l *labelIter) label() string {
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if l.slice != nil {
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return l.slice[l.i]
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}
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p := strings.IndexByte(l.orig[l.curStart:], '.')
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l.curEnd = l.curStart + p
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if p == -1 {
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l.curEnd = len(l.orig)
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}
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return l.orig[l.curStart:l.curEnd]
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}
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// next sets the value to the next label. It skips the last label if it is empty.
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func (l *labelIter) next() {
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l.i++
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if l.slice != nil {
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if l.i >= len(l.slice) || l.i == len(l.slice)-1 && l.slice[l.i] == "" {
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l.curStart = len(l.orig)
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}
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} else {
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l.curStart = l.curEnd + 1
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if l.curStart == len(l.orig)-1 && l.orig[l.curStart] == '.' {
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l.curStart = len(l.orig)
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}
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}
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}
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func (l *labelIter) set(s string) {
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if l.slice == nil {
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l.slice = strings.Split(l.orig, ".")
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}
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l.slice[l.i] = s
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}
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