Retro68/gcc/libgo/go/time/genzabbrs.go

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// Copyright 2013 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
//
// usage:
//
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// go run genzabbrs.go -output zoneinfo_abbrs_windows.go
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//
package main
import (
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"bytes"
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"encoding/xml"
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"flag"
"go/format"
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"io/ioutil"
"log"
"net/http"
"sort"
"text/template"
"time"
)
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var filename = flag.String("output", "zoneinfo_abbrs_windows.go", "output file name")
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// getAbbrs finds timezone abbreviations (standard and daylight saving time)
// for location l.
func getAbbrs(l *time.Location) (st, dt string) {
t := time.Date(time.Now().Year(), 0, 1, 0, 0, 0, 0, l)
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abbr1, off1 := t.Zone()
for i := 0; i < 12; i++ {
t = t.AddDate(0, 1, 0)
abbr2, off2 := t.Zone()
if abbr1 != abbr2 {
if off2-off1 < 0 { // southern hemisphere
abbr1, abbr2 = abbr2, abbr1
}
return abbr1, abbr2
}
}
return abbr1, abbr1
}
type zone struct {
WinName string
UnixName string
StTime string
DSTime string
}
const wzURL = "http://unicode.org/cldr/data/common/supplemental/windowsZones.xml"
type MapZone struct {
Other string `xml:"other,attr"`
Territory string `xml:"territory,attr"`
Type string `xml:"type,attr"`
}
type SupplementalData struct {
Zones []MapZone `xml:"windowsZones>mapTimezones>mapZone"`
}
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func readWindowsZones() ([]*zone, error) {
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r, err := http.Get(wzURL)
if err != nil {
return nil, err
}
defer r.Body.Close()
data, err := ioutil.ReadAll(r.Body)
if err != nil {
return nil, err
}
var sd SupplementalData
err = xml.Unmarshal(data, &sd)
if err != nil {
return nil, err
}
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zs := make([]*zone, 0)
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for _, z := range sd.Zones {
if z.Territory != "001" {
// to avoid dups. I don't know why.
continue
}
l, err := time.LoadLocation(z.Type)
if err != nil {
return nil, err
}
st, dt := getAbbrs(l)
zs = append(zs, &zone{
WinName: z.Other,
UnixName: z.Type,
StTime: st,
DSTime: dt,
})
}
return zs, nil
}
func main() {
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flag.Parse()
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zs, err := readWindowsZones()
if err != nil {
log.Fatal(err)
}
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sort.Slice(zs, func(i, j int) bool {
return zs[i].UnixName < zs[j].UnixName
})
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var v = struct {
URL string
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Zs []*zone
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}{
wzURL,
zs,
}
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var buf bytes.Buffer
err = template.Must(template.New("prog").Parse(prog)).Execute(&buf, v)
if err != nil {
log.Fatal(err)
}
data, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal(err)
}
err = ioutil.WriteFile(*filename, data, 0644)
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if err != nil {
log.Fatal(err)
}
}
const prog = `
// Copyright 2013 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.
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// Code generated by genzabbrs.go; DO NOT EDIT.
// Based on information from {{.URL}}
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package time
type abbr struct {
std string
dst string
}
var abbrs = map[string]abbr{
{{range .Zs}} "{{.WinName}}": {"{{.StTime}}", "{{.DSTime}}"}, // {{.UnixName}}
{{end}}}
`