golang generate_zipdata 代码
文件路径：/src/time/tzdata/generate_zipdata.go
/ Copyright 2020 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.
/go:build ignore
/ This program generates zipdata.go from $GOROOT/lib/time/zoneinfo.zip.
package main
import (
"bufio"
"fmt"
"os"
"strconv"
)
/ header is put at the start of the generated file.
/ The string addition avoids this file (generate_zipdata.go) from
/ matching the "generated file" regexp.
const header = `/ Copyright 2020 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.
` + `/ Code generated by generate_zipdata. DO NOT EDIT.
/ This file contains an embedded zip archive that contains time zone
/ files compiled using the code and data maintained as part of the
/ IANA Time Zone Database.
/ The IANA asserts that the data is in the public domain.
/ For more information, see
/ https://www.iana.org/time-zones
/ ftp://ftp.iana.org/tz/code/tz-link.html
/ https://datatracker.ietf.org/doc/html/rfc6557
package tzdata
const zipdata = `
func main() {
/ We should be run in the $GOROOT/src/time/tzdata directory.
data, err := os.ReadFile("../../../lib/time/zoneinfo.zip")
if err != nil {
die("cannot find zoneinfo.zip file: %v", err)
}
of, err := os.Create("zipdata.go")
if err != nil {
die("%v", err)
}
buf := bufio.NewWriter(of)
buf.WriteString(header)
ds := string(data)
i := 0
const chunk = 60
for ; i+chunk < len(data); i += chunk {
if i > 0 {
buf.WriteRune('\t')
}
fmt.Fprintf(buf, "%s +\n", strconv.Quote(ds[i:i+chunk]))
}
fmt.Fprintf(buf, "\t%s\n", strconv.Quote(ds[i:]))
if err := buf.Flush(); err != nil {
die("error writing to zipdata.go: %v", err)
}
if err := of.Close(); err != nil {
die("error closing zipdata.go: %v", err)
}
}
func die(format string, args ...any) {
fmt.Fprintf(os.Stderr, format+"\n", args...)
os.Exit(1)
}