Bump golang.org/x/text from 0.3.7 to 0.4.0 (#981)

Bumps [golang.org/x/text](https://github.com/golang/text) from 0.3.7 to 0.4.0.
- [Release notes](https://github.com/golang/text/releases)
- [Commits](https://github.com/golang/text/compare/v0.3.7...v0.4.0)

---
updated-dependencies:
- dependency-name: golang.org/x/text
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

1 files changed, 14 insertions, 10 deletions

diff --git a/vendor/golang.org/x/text/internal/language/parse.go b/vendor/golang.org/x/text/internal/language/parse.go
index 47ee0fed1..aad1e0acf 100644
--- a/vendor/golang.org/x/text/internal/language/parse.go
+++ b/vendor/golang.org/x/text/internal/language/parse.go
@@ -270,7 +270,7 @@ func parse(scan *scanner, s string) (t Tag, err error) {
 	} else if n >= 4 {
 		return Und, ErrSyntax
 	} else { // the usual case
-		t, end = parseTag(scan)
+		t, end = parseTag(scan, true)
 		if n := len(scan.token); n == 1 {
 			t.pExt = uint16(end)
 			end = parseExtensions(scan)
@@ -296,7 +296,8 @@ func parse(scan *scanner, s string) (t Tag, err error) {
 
 // parseTag parses language, script, region and variants.
 // It returns a Tag and the end position in the input that was parsed.
-func parseTag(scan *scanner) (t Tag, end int) {
+// If doNorm is true, then <lang>-<extlang> will be normalized to <extlang>.
+func parseTag(scan *scanner, doNorm bool) (t Tag, end int) {
 	var e error
 	// TODO: set an error if an unknown lang, script or region is encountered.
 	t.LangID, e = getLangID(scan.token)
@@ -307,14 +308,17 @@ func parseTag(scan *scanner) (t Tag, end int) {
 	for len(scan.token) == 3 && isAlpha(scan.token[0]) {
 		// From http://tools.ietf.org/html/bcp47, <lang>-<extlang> tags are equivalent
 		// to a tag of the form <extlang>.
-		lang, e := getLangID(scan.token)
-		if lang != 0 {
-			t.LangID = lang
-			copy(scan.b[langStart:], lang.String())
-			scan.b[langStart+3] = '-'
-			scan.start = langStart + 4
+		if doNorm {
+			lang, e := getLangID(scan.token)
+			if lang != 0 {
+				t.LangID = lang
+				langStr := lang.String()
+				copy(scan.b[langStart:], langStr)
+				scan.b[langStart+len(langStr)] = '-'
+				scan.start = langStart + len(langStr) + 1
+			}
+			scan.gobble(e)
 		}
-		scan.gobble(e)
 		end = scan.scan()
 	}
 	if len(scan.token) == 4 && isAlpha(scan.token[0]) {
@@ -559,7 +563,7 @@ func parseExtension(scan *scanner) int {
 	case 't': // https://www.ietf.org/rfc/rfc6497.txt
 		scan.scan()
 		if n := len(scan.token); n >= 2 && n <= 3 && isAlpha(scan.token[1]) {
-			_, end = parseTag(scan)
+			_, end = parseTag(scan, false)
 			scan.toLower(start, end)
 		}
 		for len(scan.token) == 2 && !isAlpha(scan.token[1]) {