encoding/json: allow punctuation in tag names

everything except backslash and the quote chars is fair game.

Fixes #3546.

R=rsc, r
CC=golang-dev
https://golang.org/cl/6048047

src/pkg/encoding/json/encode.go

@@ -17,6 +17,7 @@ import (
 	"runtime"
 	"sort"
 	"strconv"
+	"strings"
 	"sync"
 	"unicode"
 	"unicode/utf8"
@@ -415,9 +416,11 @@ func isValidTag(s string) bool {
 		return false
 	}
 	for _, c := range s {
-		switch c {
-		case '$', '-', '_', '/', '%':
-			// Acceptable
+		switch {
+		case strings.ContainsRune("!#$%&()*+-./:<=>?@[]^_{|}~", c):
+			// Backslash and quote chars are reserved, but
+			// otherwise any punctuation chars are allowed
+			// in a tag name.
 		default:
 			if !unicode.IsLetter(c) && !unicode.IsDigit(c) {
 				return false

src/pkg/encoding/json/tagkey_test.go

@@ -40,6 +40,10 @@ type percentSlashTag struct {
 	V string `json:"text/html%"` // http://golang.org/issue/2718
 }
 
+type punctuationTag struct {
+	V string `json:"!#$%&()*+-./:<=>?@[]^_{|}~"` // http://golang.org/issue/3546
+}
+
 type emptyTag struct {
 	W string
 }
@@ -73,6 +77,7 @@ var structTagObjectKeyTests = []struct {
 	{badFormatTag{"Orfevre"}, "Orfevre", "Y"},
 	{badCodeTag{"Reliable Man"}, "Reliable Man", "Z"},
 	{percentSlashTag{"brut"}, "brut", "text/html%"},
+	{punctuationTag{"Union Rags"}, "Union Rags", "!#$%&()*+-./:<=>?@[]^_{|}~"},
 }
 
 func TestStructTagObjectKey(t *testing.T) {