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gen.go
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gen.go
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//go:build ignore
package main
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"go/format"
"log"
"os"
"strings"
"github.com/LUSHDigital/go-country"
)
type Country struct {
Name string `json:"name"`
Alpha2 string `json:"alpha_2"`
Alpha3 string `json:"alpha_3"`
}
func main() {
countries, err := readCountries()
if err != nil {
log.Fatal(err)
}
var countriesBuf, alpha2Buf, alpha3Buf bytes.Buffer
for i, v := range countries {
fmt.Fprintf(
&countriesBuf, `
{
Name: "%s",
Alpha2: "%s",
Alpha3: "%s",
Locales: %#v,
},`,
v.Name,
v.Alpha2,
v.Alpha3,
v.Locales,
)
fmt.Fprintf(&alpha2Buf, `
case "%s":
ret = countries[%d]`,
v.Alpha2,
i,
)
fmt.Fprintf(&alpha3Buf, `
case "%s":
ret = countries[%d]`,
v.Alpha3,
i,
)
}
var buf bytes.Buffer
fmt.Fprintln(&buf, "package country")
fmt.Fprintf(
&buf,
`var countries = [%d]Country{%s
}
// ByAlpha2 looks up a country by its ISO 3166-1 alpha-2 code.
// Callers should check the boolean before using the returned country.
func ByAlpha2(code string) (*Country, bool) {
var ret Country
// Prevent escape to the heap by using switch over map.
switch code {%s
default:
return nil, false
}
// Prevent mutation of original slice.
ret.Locales = append([]string(nil), ret.Locales...)
return &ret, true
}
// ByAlpha3 looks up a country by its ISO 3166-1 alpha-3 code.
// Callers should check the boolean before using the returned country.
func ByAlpha3(code string) (*Country, bool) {
var ret Country
// Prevent escape to the heap by using switch over map.
switch code {%s
default:
return nil, false
}
// Prevent mutation of original slice.
ret.Locales = append([]string(nil), ret.Locales...)
return &ret, true
}`,
len(countries),
countriesBuf.Bytes(),
alpha2Buf.Bytes(),
alpha3Buf.Bytes(),
)
res, err := format.Source(buf.Bytes())
if err != nil {
log.Fatalf("go fmt: %v", err)
}
if err := os.WriteFile("./country_gen.go", res, 0644); err != nil {
log.Fatal(err)
}
}
func readCountries() ([]country.Country, error) {
iso3166, err := os.Open("./data/iso_3166-1.json")
if err != nil {
return nil, err
}
defer iso3166.Close()
data := make(map[string][]Country)
if err := json.NewDecoder(iso3166).Decode(&data); err != nil {
return nil, fmt.Errorf("json decode: %v", err)
}
countryInfo, err := os.Open("./data/countryInfo.txt")
if err != nil {
return nil, err
}
defer countryInfo.Close()
alpha3Tolocales := make(map[string]string)
scanner := bufio.NewScanner(countryInfo)
for scanner.Scan() {
row := strings.Split(scanner.Text(), "\t")
locales := row[len(row)-4]
if locales == "" {
continue
}
alpha3Tolocales[row[1]] = locales
}
if err := scanner.Err(); err != nil {
return nil, err
}
countries := make([]country.Country, 0, len(data["3166-1"]))
for _, v := range data["3166-1"] {
var locs []string
if l, ok := alpha3Tolocales[v.Alpha3]; ok {
locs = strings.Split(l, ",")
}
countries = append(countries, country.Country{
Name: v.Name,
Alpha2: v.Alpha2,
Alpha3: v.Alpha3,
Locales: locs,
})
}
return countries, nil
}