publicsuffix: hold icann-ness until wildcards fully match

Consider the "uberspace.de" domain. The relevant rules in the Public
Suffix List are "*.uberspace.de" (in the PRVIATE DOMAIN section) and
"de" (in the ICANN DOMAIN section).

The PublicSuffix function returns a string and a bool. Both before and
after this commit, the string returned is "de", which is correct
according to a literal interpretation of the formal algorithm. But the
bool returned, icann-ness, is false before and true after. The correct
answer is true, since the matching rule, "de", is in the ICANN DOMAIN
section of the PSL.

Before this commit, the two-stage match for "*.uberspace" set the icann
bit when matching the back part, "uberspace", before checking that the
front part, the "*" wildcard, also matched.

A couple more examples, for the "bd" and "ck" domains. The relevant
rules are "*.bd" and "*.ck", with no non-wildcard "bd" or "ck" rule.
Before this commit, the PublicSuffix function would return (icann ==
true), when the correct result is (icann == false), the same as for
"nosuchtld".

Benchmarks get worse, but correctness trumps performance. Future commits
may be able to recover some of the loss. In any case, in absolute terms,
15µs is still pretty fast.

name             old time/op  new time/op  delta
PublicSuffix-56  11.0µs ± 0%  14.8µs ± 2%  +34.57%  (p=0.000 n=9+10)

Change-Id: I85ca6ab57a31308af5a29c46313197897eab5ab6
Reviewed-on: https://go-review.googlesource.com/c/154977Reviewed-by: Nigel Tao <nigeltao@golang.org>

publicsuffix/gen.go

@@ -100,6 +100,7 @@ var (
 	labelsList    = []string{}
 	labelsMap     = map[string]bool{}
 	rules         = []string{}
+	numICANNRules = 0
 
 	// validSuffixRE is used to check that the entries in the public suffix
 	// list are in canonical form (after Punycode encoding). Specifically,
@@ -167,11 +168,14 @@ func main1() error {
 		}
 		s = strings.TrimSpace(s)
 		if strings.Contains(s, "BEGIN ICANN DOMAINS") {
+			if len(rules) != 0 {
+				return fmt.Errorf(`expected no rules before "BEGIN ICANN DOMAINS"`)
+			}
 			icann = true
 			continue
 		}
 		if strings.Contains(s, "END ICANN DOMAINS") {
-			icann = false
+			icann, numICANNRules = false, len(rules)
 			continue
 		}
 		if s == "" || strings.HasPrefix(s, "//") {
@@ -287,7 +291,7 @@ func gitCommit() (sha, date string, retErr error) {
 
 func printTest(w io.Writer, n *node) error {
 	fmt.Fprintf(w, "// generated by go run gen.go; DO NOT EDIT\n\n")
-	fmt.Fprintf(w, "package publicsuffix\n\nvar rules = [...]string{\n")
+	fmt.Fprintf(w, "package publicsuffix\n\nconst numICANNRules = %d\n\nvar rules = [...]string{\n", numICANNRules)
 	for _, rule := range rules {
 		fmt.Fprintf(w, "%q,\n", rule)
 	}

publicsuffix/list.go

@@ -84,11 +84,12 @@ func (list) String() string {
 // https://wiki.mozilla.org/Public_Suffix_List/Use_Cases
 func PublicSuffix(domain string) (publicSuffix string, icann bool) {
 	lo, hi := uint32(0), uint32(numTLD)
-	s, suffix, wildcard := domain, len(domain), false
+	s, suffix, icannNode, wildcard := domain, len(domain), false, false
 loop:
 	for {
 		dot := strings.LastIndex(s, ".")
 		if wildcard {
+			icann = icannNode
 			suffix = 1 + dot
 		}
 		if lo == hi {
@@ -100,7 +101,7 @@ loop:
 		}
 
 		u := nodes[f] >> (nodesBitsTextOffset + nodesBitsTextLength)
-		icann = u&(1<<nodesBitsICANN-1) != 0
+		icannNode = u&(1<<nodesBitsICANN-1) != 0
 		u >>= nodesBitsICANN
 		u = children[u&(1<<nodesBitsChildren-1)]
 		lo = u & (1<<childrenBitsLo - 1)
@@ -116,6 +117,9 @@ loop:
 		}
 		u >>= childrenBitsNodeType
 		wildcard = u&(1<<childrenBitsWildcard-1) != 0
+		if !wildcard {
+			icann = icannNode
+		}
 
 		if dot == -1 {
 			break

publicsuffix/table_test.go

@@ -2,6 +2,8 @@
 
 package publicsuffix
 
+const numICANNRules = 7334
+
 var rules = [...]string{
 	"ac",
 	"com.ac",