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message.go
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message.go
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package i18n
import (
"fmt"
"strings"
)
// Message is a string that can be localized.
type Message struct {
// ID uniquely identifies the message.
ID string
// Hash uniquely identifies the content of the message
// that this message was translated from.
Hash string
// Description describes the message to give additional
// context to translators that may be relevant for translation.
Description string
// LeftDelim is the left Go template delimiter.
LeftDelim string
// RightDelim is the right Go template delimiter.
RightDelim string
// Zero is the content of the message for the CLDR plural form "zero".
Zero string
// One is the content of the message for the CLDR plural form "one".
One string
// Two is the content of the message for the CLDR plural form "two".
Two string
// Few is the content of the message for the CLDR plural form "few".
Few string
// Many is the content of the message for the CLDR plural form "many".
Many string
// Other is the content of the message for the CLDR plural form "other".
Other string
}
// NewMessage parses data and returns a new message.
func NewMessage(data interface{}) (*Message, error) {
m := &Message{}
if err := m.unmarshalInterface(data); err != nil {
return nil, err
}
return m, nil
}
// MustNewMessage is similar to NewMessage except it panics if an error happens.
func MustNewMessage(data interface{}) *Message {
m, err := NewMessage(data)
if err != nil {
panic(err)
}
return m
}
// unmarshalInterface unmarshals a message from data.
func (m *Message) unmarshalInterface(v interface{}) error {
strdata, err := stringMap(v)
if err != nil {
return err
}
for k, v := range strdata {
switch strings.ToLower(k) {
case "id":
m.ID = v
case "description":
m.Description = v
case "hash":
m.Hash = v
case "leftdelim":
m.LeftDelim = v
case "rightdelim":
m.RightDelim = v
case "zero":
m.Zero = v
case "one":
m.One = v
case "two":
m.Two = v
case "few":
m.Few = v
case "many":
m.Many = v
case "other":
m.Other = v
}
}
return nil
}
type keyTypeErr struct {
key interface{}
}
func (err *keyTypeErr) Error() string {
return fmt.Sprintf("expected key to be a string but got %#v", err.key)
}
type valueTypeErr struct {
value interface{}
}
func (err *valueTypeErr) Error() string {
return fmt.Sprintf("unsupported type %#v", err.value)
}
func stringMap(v interface{}) (map[string]string, error) {
switch value := v.(type) {
case string:
return map[string]string{
"other": value,
}, nil
case map[string]string:
return value, nil
case map[string]interface{}:
strdata := make(map[string]string, len(value))
for k, v := range value {
err := stringSubmap(k, v, strdata)
if err != nil {
return nil, err
}
}
return strdata, nil
case map[interface{}]interface{}:
strdata := make(map[string]string, len(value))
for k, v := range value {
kstr, ok := k.(string)
if !ok {
return nil, &keyTypeErr{key: k}
}
err := stringSubmap(kstr, v, strdata)
if err != nil {
return nil, err
}
}
return strdata, nil
default:
return nil, &valueTypeErr{value: value}
}
}
func stringSubmap(k string, v interface{}, strdata map[string]string) error {
if k == "translation" {
switch vt := v.(type) {
case string:
strdata["other"] = vt
default:
v1Message, err := stringMap(v)
if err != nil {
return err
}
for kk, vv := range v1Message {
strdata[kk] = vv
}
}
return nil
}
switch vt := v.(type) {
case string:
strdata[k] = vt
return nil
case nil:
return nil
default:
return fmt.Errorf("expected value for key %q be a string but got %#v", k, v)
}
}
// isMessage tells whether the given data is a message, or a map containing
// nested messages.
// A map is assumed to be a message if it contains any of the "reserved" keys:
// "id", "description", "hash", "leftdelim", "rightdelim", "zero", "one", "two", "few", "many", "other"
// with a string value.
// e.g.,
// - {"message": {"description": "world"}} is a message
// - {"message": {"description": "world", "foo": "bar"}} is a message ("foo" key is ignored)
// - {"notmessage": {"description": {"hello": "world"}}} is not
// - {"notmessage": {"foo": "bar"}} is not
func isMessage(v interface{}) bool {
reservedKeys := []string{"id", "description", "hash", "leftdelim", "rightdelim", "zero", "one", "two", "few", "many", "other"}
switch data := v.(type) {
case nil, string:
return true
case map[string]interface{}:
for _, key := range reservedKeys {
val, ok := data[key]
if !ok {
continue
}
_, ok = val.(string)
if !ok {
continue
}
// v is a message if it contains a "reserved" key holding a string value
return true
}
case map[interface{}]interface{}:
for _, key := range reservedKeys {
val, ok := data[key]
if !ok {
continue
}
_, ok = val.(string)
if !ok {
continue
}
// v is a message if it contains a "reserved" key holding a string value
return true
}
}
return false
}