--- /dev/null
+// Copyright 2015 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
+
+// This file generates derivative tables based on the language package itself.
+
+import (
+ "bytes"
+ "flag"
+ "fmt"
+ "io/ioutil"
+ "log"
+ "reflect"
+ "sort"
+ "strings"
+
+ "golang.org/x/text/internal/gen"
+ "golang.org/x/text/language"
+ "golang.org/x/text/unicode/cldr"
+)
+
+var (
+ test = flag.Bool("test", false,
+ "test existing tables; can be used to compare web data with package data.")
+
+ draft = flag.String("draft",
+ "contributed",
+ `Minimal draft requirements (approved, contributed, provisional, unconfirmed).`)
+)
+
+func main() {
+ gen.Init()
+
+ // Read the CLDR zip file.
+ r := gen.OpenCLDRCoreZip()
+ defer r.Close()
+
+ d := &cldr.Decoder{}
+ data, err := d.DecodeZip(r)
+ if err != nil {
+ log.Fatalf("DecodeZip: %v", err)
+ }
+
+ w := gen.NewCodeWriter()
+ defer func() {
+ buf := &bytes.Buffer{}
+
+ if _, err = w.WriteGo(buf, "language"); err != nil {
+ log.Fatalf("Error formatting file index.go: %v", err)
+ }
+
+ // Since we're generating a table for our own package we need to rewrite
+ // doing the equivalent of go fmt -r 'language.b -> b'. Using
+ // bytes.Replace will do.
+ out := bytes.Replace(buf.Bytes(), []byte("language."), nil, -1)
+ if err := ioutil.WriteFile("index.go", out, 0600); err != nil {
+ log.Fatalf("Could not create file index.go: %v", err)
+ }
+ }()
+
+ m := map[language.Tag]bool{}
+ for _, lang := range data.Locales() {
+ // We include all locales unconditionally to be consistent with en_US.
+ // We want en_US, even though it has no data associated with it.
+
+ // TODO: put any of the languages for which no data exists at the end
+ // of the index. This allows all components based on ICU to use that
+ // as the cutoff point.
+ // if x := data.RawLDML(lang); false ||
+ // x.LocaleDisplayNames != nil ||
+ // x.Characters != nil ||
+ // x.Delimiters != nil ||
+ // x.Measurement != nil ||
+ // x.Dates != nil ||
+ // x.Numbers != nil ||
+ // x.Units != nil ||
+ // x.ListPatterns != nil ||
+ // x.Collations != nil ||
+ // x.Segmentations != nil ||
+ // x.Rbnf != nil ||
+ // x.Annotations != nil ||
+ // x.Metadata != nil {
+
+ // TODO: support POSIX natively, albeit non-standard.
+ tag := language.Make(strings.Replace(lang, "_POSIX", "-u-va-posix", 1))
+ m[tag] = true
+ // }
+ }
+ // Include locales for plural rules, which uses a different structure.
+ for _, plurals := range data.Supplemental().Plurals {
+ for _, rules := range plurals.PluralRules {
+ for _, lang := range strings.Split(rules.Locales, " ") {
+ m[language.Make(lang)] = true
+ }
+ }
+ }
+
+ var core, special []language.Tag
+
+ for t := range m {
+ if x := t.Extensions(); len(x) != 0 && fmt.Sprint(x) != "[u-va-posix]" {
+ log.Fatalf("Unexpected extension %v in %v", x, t)
+ }
+ if len(t.Variants()) == 0 && len(t.Extensions()) == 0 {
+ core = append(core, t)
+ } else {
+ special = append(special, t)
+ }
+ }
+
+ w.WriteComment(`
+ NumCompactTags is the number of common tags. The maximum tag is
+ NumCompactTags-1.`)
+ w.WriteConst("NumCompactTags", len(core)+len(special))
+
+ sort.Sort(byAlpha(special))
+ w.WriteVar("specialTags", special)
+
+ // TODO: order by frequency?
+ sort.Sort(byAlpha(core))
+
+ // Size computations are just an estimate.
+ w.Size += int(reflect.TypeOf(map[uint32]uint16{}).Size())
+ w.Size += len(core) * 6 // size of uint32 and uint16
+
+ fmt.Fprintln(w)
+ fmt.Fprintln(w, "var coreTags = map[uint32]uint16{")
+ fmt.Fprintln(w, "0x0: 0, // und")
+ i := len(special) + 1 // Und and special tags already written.
+ for _, t := range core {
+ if t == language.Und {
+ continue
+ }
+ fmt.Fprint(w.Hash, t, i)
+ b, s, r := t.Raw()
+ fmt.Fprintf(w, "0x%s%s%s: %d, // %s\n",
+ getIndex(b, 3), // 3 is enough as it is guaranteed to be a compact number
+ getIndex(s, 2),
+ getIndex(r, 3),
+ i, t)
+ i++
+ }
+ fmt.Fprintln(w, "}")
+}
+
+// getIndex prints the subtag type and extracts its index of size nibble.
+// If the index is less than n nibbles, the result is prefixed with 0s.
+func getIndex(x interface{}, n int) string {
+ s := fmt.Sprintf("%#v", x) // s is of form Type{typeID: 0x00}
+ s = s[strings.Index(s, "0x")+2 : len(s)-1]
+ return strings.Repeat("0", n-len(s)) + s
+}
+
+type byAlpha []language.Tag
+
+func (a byAlpha) Len() int { return len(a) }
+func (a byAlpha) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
+func (a byAlpha) Less(i, j int) bool { return a[i].String() < a[j].String() }
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