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First round of i18n in acs-engine based on gettext. Subsequent change…
…s will replace and extract resource strings in acs-engine and make acsengine/api package's i18n used by other go program.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package i18n | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "github.com/leonelquinteros/gotext" | ||
| ) | ||
|
|
||
| const ( | ||
| defaultLanguage = "default" | ||
| defaultDomain = "acsengine" | ||
| defaultLocalDir = "translations" | ||
| ) | ||
|
|
||
| var supportedTranslations = map[string]bool{ | ||
| defaultLanguage: true, | ||
| "en_US": true, | ||
| "zh_CN": true, | ||
| } | ||
|
|
||
| func loadSystemLanguage() string { | ||
| language := os.Getenv("LANG") | ||
| if language == "" { | ||
| return defaultLanguage | ||
| } | ||
|
|
||
| // Posix locale name usually has the ll_CC.encoding syntax. | ||
| parts := strings.Split(language, ".") | ||
| if len(parts) == 0 { | ||
| return defaultLanguage | ||
| } | ||
| return parts[0] | ||
| } | ||
|
|
||
| // LoadTranslations loads translation files and sets the locale to | ||
| // the system locale. It should be called by the main program. | ||
| func LoadTranslations(translationsDir string) (*gotext.Locale, error) { | ||
| dir := defaultLocalDir | ||
| if translationsDir != "" { | ||
| dir = translationsDir | ||
| } | ||
|
|
||
| if stat, err := os.Stat(dir); os.IsNotExist(err) || !stat.IsDir() { | ||
| return nil, fmt.Errorf("Translations directory %s does not exist: %v", dir, err) | ||
| } | ||
|
|
||
| lang := loadSystemLanguage() | ||
| SetLanguage(lang) | ||
|
|
||
| locale := gotext.NewLocale(dir, lang) | ||
| Initialize(locale) | ||
|
|
||
| return locale, nil | ||
| } | ||
|
|
||
| // Initialize is the translation initialization function shared by the main program and package. | ||
| func Initialize(locale *gotext.Locale) error { | ||
| if locale == nil { | ||
| return fmt.Errorf("Initialize expected locale but got nil") | ||
| } | ||
| locale.AddDomain(defaultDomain) | ||
| return nil | ||
| } | ||
|
|
||
| // SetLanguage sets the program's current locale. If the language is not | ||
| // supported, then the default locale is used. | ||
| func SetLanguage(language string) { | ||
| if _, ok := supportedTranslations[language]; ok { | ||
| gotext.SetLanguage(language) | ||
| return | ||
| } | ||
| gotext.SetLanguage(defaultLanguage) | ||
| } | ||
|
|
||
| // GetLanguage queries the program's current locale. | ||
| func GetLanguage() string { | ||
| return gotext.GetLanguage() | ||
| } | ||
|
|
||
| // Translator is a wrapper over gotext's Locale and provides interface to | ||
| // translate text string and produce translated error | ||
| type Translator struct { | ||
| Locale *gotext.Locale | ||
| } | ||
|
|
||
| // T translates a text string, based on GNU's gettext library. | ||
| func (t *Translator) T(msgid string, vars ...interface{}) string { | ||
| return t.Locale.GetD(defaultDomain, msgid, vars...) | ||
| } | ||
|
|
||
| // NT translates a text string into the appropriate plural form, based on GNU's gettext library. | ||
| func (t *Translator) NT(msgid, msgidPlural string, n int, vars ...interface{}) string { | ||
| return t.Locale.GetND(defaultDomain, msgid, msgidPlural, n, vars...) | ||
| } | ||
|
|
||
| // Errorf produces an error with a translated error string. | ||
| func (t *Translator) Errorf(msgid string, vars ...interface{}) error { | ||
| return errors.New(t.T(msgid, vars...)) | ||
| } | ||
|
|
||
| // NErrorf produces an error with a translated error string in the appropriate plural form. | ||
| func (t *Translator) NErrorf(msgid, msgidPlural string, n int, vars ...interface{}) error { | ||
| return errors.New(t.NT(msgid, msgidPlural, n, vars...)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| package i18n | ||
|
|
||
| import ( | ||
| "os" | ||
| "path" | ||
| "testing" | ||
|
|
||
| . "github.com/onsi/gomega" | ||
| ) | ||
|
|
||
| func TestLoadTranslations(t *testing.T) { | ||
| RegisterTestingT(t) | ||
|
|
||
| _, err := LoadTranslations(path.Join("..", "..", "translations", "test")) | ||
| Expect(err).Should(BeNil()) | ||
|
|
||
| _, err = LoadTranslations("non_existing_directory") | ||
| Expect(err).ShouldNot(BeNil()) | ||
| } | ||
|
|
||
| func TestTranslationLanguage(t *testing.T) { | ||
| RegisterTestingT(t) | ||
|
|
||
| origLang := os.Getenv("LANG") | ||
| os.Setenv("LANG", "en_US.UTF-8") | ||
| _, err := LoadTranslations(path.Join("..", "..", "translations", "test")) | ||
| Expect(err).Should(BeNil()) | ||
|
|
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| lang := GetLanguage() | ||
| Expect(lang).Should(Equal("en_US")) | ||
|
|
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| os.Setenv("LANG", origLang) | ||
| } | ||
|
|
||
| func TestTranslationLanguageDefault(t *testing.T) { | ||
| RegisterTestingT(t) | ||
|
|
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| origLang := os.Getenv("LANG") | ||
| os.Setenv("LANG", "ll_CC.UTF-8") | ||
| _, err := LoadTranslations(path.Join("..", "..", "translations", "test")) | ||
| Expect(err).Should(BeNil()) | ||
|
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| lang := GetLanguage() | ||
| Expect(lang).Should(Equal("default")) | ||
|
|
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| os.Setenv("LANG", origLang) | ||
| } | ||
|
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| func TestTranslations(t *testing.T) { | ||
| RegisterTestingT(t) | ||
|
|
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| l, err := LoadTranslations(path.Join("..", "..", "translations", "test")) | ||
| Expect(err).Should(BeNil()) | ||
|
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| translator := &Translator{ | ||
| Locale: l, | ||
| } | ||
|
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| msg := translator.T("Aloha") | ||
| Expect(msg).Should(Equal("Aloha")) | ||
|
|
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| msg = translator.T("Hello %s", "World") | ||
| Expect(msg).Should(Equal("Hello World")) | ||
| } | ||
|
|
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| func TestTranslationsPlural(t *testing.T) { | ||
| RegisterTestingT(t) | ||
|
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| l, err := LoadTranslations(path.Join("..", "..", "translations", "test")) | ||
| Expect(err).Should(BeNil()) | ||
|
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| translator := &Translator{ | ||
| Locale: l, | ||
| } | ||
|
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| msg := translator.NT("There is %d parameter in resource %s", "There are %d parameters in resource %s", 1, 1, "Foo") | ||
| Expect(msg).Should(Equal("There is 1 parameter in resource Foo")) | ||
|
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| msg = translator.NT("There is %d parameter in resource %s", "There are %d parameters in resource %s", 9, 9, "Foo") | ||
| Expect(msg).Should(Equal("There are 9 parameters in resource Foo")) | ||
| } |
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