Checking in vendor folder for ease of using go get.

vendor/golang.org/x/text/encoding/ianaindex/gen.go

@@ -0,0 +1,192 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+package main
+
+import (
+	"encoding/xml"
+	"fmt"
+	"io"
+	"log"
+	"sort"
+	"strconv"
+	"strings"
+
+	"golang.org/x/text/encoding/internal/identifier"
+	"golang.org/x/text/internal/gen"
+)
+
+type registry struct {
+	XMLName  xml.Name `xml:"registry"`
+	Updated  string   `xml:"updated"`
+	Registry []struct {
+		ID     string `xml:"id,attr"`
+		Record []struct {
+			Name string `xml:"name"`
+			Xref []struct {
+				Type string `xml:"type,attr"`
+				Data string `xml:"data,attr"`
+			} `xml:"xref"`
+			Desc struct {
+				Data string `xml:",innerxml"`
+			} `xml:"description,"`
+			MIB   string   `xml:"value"`
+			Alias []string `xml:"alias"`
+			MIME  string   `xml:"preferred_alias"`
+		} `xml:"record"`
+	} `xml:"registry"`
+}
+
+func main() {
+	r := gen.OpenIANAFile("assignments/character-sets/character-sets.xml")
+	reg := &registry{}
+	if err := xml.NewDecoder(r).Decode(&reg); err != nil && err != io.EOF {
+		log.Fatalf("Error decoding charset registry: %v", err)
+	}
+	if len(reg.Registry) == 0 || reg.Registry[0].ID != "character-sets-1" {
+		log.Fatalf("Unexpected ID %s", reg.Registry[0].ID)
+	}
+
+	x := &indexInfo{}
+
+	for _, rec := range reg.Registry[0].Record {
+		mib := identifier.MIB(parseInt(rec.MIB))
+		x.addEntry(mib, rec.Name)
+		for _, a := range rec.Alias {
+			a = strings.Split(a, " ")[0] // strip comments.
+			x.addAlias(a, mib)
+			// MIB name aliases are prefixed with a "cs" (character set) in the
+			// registry to identify them as display names and to ensure that
+			// the name starts with a lowercase letter in case it is used as
+			// an identifier. We remove it to be left with a nice clean name.
+			if strings.HasPrefix(a, "cs") {
+				x.setName(2, a[2:])
+			}
+		}
+		if rec.MIME != "" {
+			x.addAlias(rec.MIME, mib)
+			x.setName(1, rec.MIME)
+		}
+	}
+
+	w := gen.NewCodeWriter()
+
+	fmt.Fprintln(w, `import "golang.org/x/text/encoding/internal/identifier"`)
+
+	writeIndex(w, x)
+
+	w.WriteGoFile("tables.go", "ianaindex")
+}
+
+type alias struct {
+	name string
+	mib  identifier.MIB
+}
+
+type indexInfo struct {
+	// compacted index from code to MIB
+	codeToMIB []identifier.MIB
+	alias     []alias
+	names     [][3]string
+}
+
+func (ii *indexInfo) Len() int {
+	return len(ii.codeToMIB)
+}
+
+func (ii *indexInfo) Less(a, b int) bool {
+	return ii.codeToMIB[a] < ii.codeToMIB[b]
+}
+
+func (ii *indexInfo) Swap(a, b int) {
+	ii.codeToMIB[a], ii.codeToMIB[b] = ii.codeToMIB[b], ii.codeToMIB[a]
+	// Co-sort the names.
+	ii.names[a], ii.names[b] = ii.names[b], ii.names[a]
+}
+
+func (ii *indexInfo) setName(i int, name string) {
+	ii.names[len(ii.names)-1][i] = name
+}
+
+func (ii *indexInfo) addEntry(mib identifier.MIB, name string) {
+	ii.names = append(ii.names, [3]string{name, name, name})
+	ii.addAlias(name, mib)
+	ii.codeToMIB = append(ii.codeToMIB, mib)
+}
+
+func (ii *indexInfo) addAlias(name string, mib identifier.MIB) {
+	// Don't add duplicates for the same mib. Adding duplicate aliases for
+	// different MIBs will cause the compiler to barf on an invalid map: great!.
+	for i := len(ii.alias) - 1; i >= 0 && ii.alias[i].mib == mib; i-- {
+		if ii.alias[i].name == name {
+			return
+		}
+	}
+	ii.alias = append(ii.alias, alias{name, mib})
+	lower := strings.ToLower(name)
+	if lower != name {
+		ii.addAlias(lower, mib)
+	}
+}
+
+const maxMIMENameLen = '0' - 1 // officially 40, but we leave some buffer.
+
+func writeIndex(w *gen.CodeWriter, x *indexInfo) {
+	sort.Stable(x)
+
+	// Write constants.
+	fmt.Fprintln(w, "const (")
+	for i, m := range x.codeToMIB {
+		if i == 0 {
+			fmt.Fprintf(w, "enc%d = iota\n", m)
+		} else {
+			fmt.Fprintf(w, "enc%d\n", m)
+		}
+	}
+	fmt.Fprintln(w, "numIANA")
+	fmt.Fprintln(w, ")")
+
+	w.WriteVar("ianaToMIB", x.codeToMIB)
+
+	var ianaNames, mibNames []string
+	for _, names := range x.names {
+		n := names[0]
+		if names[0] != names[1] {
+			// MIME names are mostly identical to IANA names. We share the
+			// tables by setting the first byte of the string to an index into
+			// the string itself (< maxMIMENameLen) to the IANA name. The MIME
+			// name immediately follows the index.
+			x := len(names[1]) + 1
+			if x > maxMIMENameLen {
+				log.Fatalf("MIME name length (%d) > %d", x, maxMIMENameLen)
+			}
+			n = string(x) + names[1] + names[0]
+		}
+		ianaNames = append(ianaNames, n)
+		mibNames = append(mibNames, names[2])
+	}
+
+	w.WriteVar("ianaNames", ianaNames)
+	w.WriteVar("mibNames", mibNames)
+
+	w.WriteComment(`
+	TODO: Instead of using a map, we could use binary search strings doing
+	on-the fly lower-casing per character. This allows to always avoid
+	allocation and will be considerably more compact.`)
+	fmt.Fprintln(w, "var ianaAliases = map[string]int{")
+	for _, a := range x.alias {
+		fmt.Fprintf(w, "%q: enc%d,\n", a.name, a.mib)
+	}
+	fmt.Fprintln(w, "}")
+}
+
+func parseInt(s string) int {
+	x, err := strconv.ParseInt(s, 10, 64)
+	if err != nil {
+		log.Fatalf("Could not parse integer: %v", err)
+	}
+	return int(x)
+}