1 files changed, 58 insertions, 6 deletions

diff --git a/vendor/golang.org/x/text/internal/gen/gen.go b/vendor/golang.org/x/text/internal/gen/gen.go
index 2acb035..4c3f760 100644
--- a/vendor/golang.org/x/text/internal/gen/gen.go
+++ b/vendor/golang.org/x/text/internal/gen/gen.go
@@ -31,6 +31,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"strings"
 	"sync"
 	"unicode"
 
@@ -69,8 +70,6 @@ func Init() {
 
 const header = `// Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
 
-package %s
-
 `
 
 // UnicodeVersion reports the requested Unicode version.
@@ -78,11 +77,33 @@ func UnicodeVersion() string {
 	return *unicodeVersion
 }
 
-// UnicodeVersion reports the requested CLDR version.
+// CLDRVersion reports the requested CLDR version.
 func CLDRVersion() string {
 	return *cldrVersion
 }
 
+var tags = []struct{ version, buildTags string }{
+	{"10.0.0", "go1.10"},
+	{"", "!go1.10"},
+}
+
+// buildTags reports the build tags used for the current Unicode version.
+func buildTags() string {
+	v := UnicodeVersion()
+	for _, x := range tags {
+		// We should do a numeric comparison, but including the collate package
+		// would create an import cycle. We approximate it by assuming that
+		// longer version strings are later.
+		if len(x.version) <= len(v) {
+			return x.buildTags
+		}
+		if len(x.version) == len(v) && x.version <= v {
+			return x.buildTags
+		}
+	}
+	return tags[0].buildTags
+}
+
 // IsLocal reports whether data files are available locally.
 func IsLocal() bool {
 	dir, err := localReadmeFile()
@@ -243,15 +264,46 @@ func WriteGoFile(filename, pkg string, b []byte) {
 		log.Fatalf("Could not create file %s: %v", filename, err)
 	}
 	defer w.Close()
-	if _, err = WriteGo(w, pkg, b); err != nil {
+	if _, err = WriteGo(w, pkg, "", b); err != nil {
+		log.Fatalf("Error writing file %s: %v", filename, err)
+	}
+}
+
+func insertVersion(filename, version string) string {
+	suffix := ".go"
+	if strings.HasSuffix(filename, "_test.go") {
+		suffix = "_test.go"
+	}
+	return fmt.Sprint(filename[:len(filename)-len(suffix)], version, suffix)
+}
+
+// WriteVersionedGoFile prepends a standard file comment, adds build tags to
+// version the file for the current Unicode version, and package statement to
+// the given bytes, applies gofmt, and writes them to a file with the given
+// name. It will call log.Fatal if there are any errors.
+func WriteVersionedGoFile(filename, pkg string, b []byte) {
+	tags := buildTags()
+	if tags != "" {
+		filename = insertVersion(filename, UnicodeVersion())
+	}
+	w, err := os.Create(filename)
+	if err != nil {
+		log.Fatalf("Could not create file %s: %v", filename, err)
+	}
+	defer w.Close()
+	if _, err = WriteGo(w, pkg, tags, b); err != nil {
 		log.Fatalf("Error writing file %s: %v", filename, err)
 	}
 }
 
 // WriteGo prepends a standard file comment and package statement to the given
 // bytes, applies gofmt, and writes them to w.
-func WriteGo(w io.Writer, pkg string, b []byte) (n int, err error) {
-	src := []byte(fmt.Sprintf(header, pkg))
+func WriteGo(w io.Writer, pkg, tags string, b []byte) (n int, err error) {
+	src := []byte(header)
+	if tags != "" {
+		src = append(src, fmt.Sprintf("// +build %s\n\n", tags)...)
+	}
+	src = append(src, fmt.Sprintf("package %s\n\n", pkg)...)
 	src = append(src, b...)
 	formatted, err := format.Source(src)
 	if err != nil {