Make Locale and Po objects serializable. Closes #23

translator.go

@@ -5,8 +5,11 @@
 
 package gotext
 
+import "net/textproto"
+
 // Translator interface is used by Locale and Po objects.Translator
 // It contains all methods needed to parse translation sources and obtain corresponding translations.
+// Also implements gob.GobEncoder/gob.DobDecoder interfaces to allow serialization of Locale objects.
 type Translator interface {
 	ParseFile(f string)
 	Parse(buf []byte)
@@ -14,4 +17,43 @@ type Translator interface {
 	GetN(str, plural string, n int, vars ...interface{}) string
 	GetC(str, ctx string, vars ...interface{}) string
 	GetNC(str, plural string, n int, ctx string, vars ...interface{}) string
+
+	MarshalBinary() ([]byte, error)
+	UnmarshalBinary([]byte) error
+}
+
+// TranslatorEncoding is used as intermediary storage to encode Translator objects to Gob.
+type TranslatorEncoding struct {
+	// Headers storage
+	Headers textproto.MIMEHeader
+
+	// Language header
+	Language string
+
+	// Plural-Forms header
+	PluralForms string
+
+	// Parsed Plural-Forms header values
+	Nplurals int
+	Plural   string
+
+	// Storage
+	Translations map[string]*Translation
+	Contexts     map[string]map[string]*Translation
+}
+
+// GetTranslator is used to recover a Translator object after unmarshaling the TranslatorEncoding object.
+// Internally uses a Po object as it should be switcheable with Mo objects without problem.
+// External Translator implementations should be able to serialize into a TranslatorEncoding object in order to unserialize into a Po-compatible object.
+func (te *TranslatorEncoding) GetTranslator() Translator {
+	po := new(Po)
+	po.Headers = te.Headers
+	po.Language = te.Language
+	po.PluralForms = te.PluralForms
+	po.nplurals = te.Nplurals
+	po.plural = te.Plural
+	po.translations = te.Translations
+	po.contexts = te.Contexts
+
+	return po
 }