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// Copyright 2017 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package i18n
import (
"context"
"fmt"
"reflect"
"strings"
"github.com/spf13/cast"
"github.com/gohugoio/hugo/common/hreflect"
"github.com/gohugoio/hugo/common/loggers"
"github.com/gohugoio/hugo/config"
"github.com/gohugoio/hugo/resources/page"
"github.com/gohugoio/go-i18n/v2/i18n"
)
type translateFunc func(ctx context.Context, translationID string, templateData any) string
// Translator handles i18n translations.
type Translator struct {
translateFuncs map[string]translateFunc
cfg config.AllProvider
logger loggers.Logger
}
// NewTranslator creates a new Translator for the given language bundle and configuration.
func NewTranslator(b *i18n.Bundle, cfg config.AllProvider, logger loggers.Logger) Translator {
t := Translator{cfg: cfg, logger: logger, translateFuncs: make(map[string]translateFunc)}
t.initFuncs(b)
return t
}
// Func gets the translate func for the given language, or for the default
// configured language if not found.
func (t Translator) Func(lang string) translateFunc {
if f, ok := t.translateFuncs[lang]; ok {
return f
}
t.logger.Infof("Translation func for language %v not found, use default.", lang)
if f, ok := t.translateFuncs[t.cfg.DefaultContentLanguage()]; ok {
return f
}
t.logger.Infoln("i18n not initialized; if you need string translations, check that you have a bundle in /i18n that matches the site language or the default language.")
return func(ctx context.Context, translationID string, args any) string {
return ""
}
}
func (t Translator) initFuncs(bndl *i18n.Bundle) {
enableMissingTranslationPlaceholders := t.cfg.EnableMissingTranslationPlaceholders()
for _, lang := range bndl.LanguageTags() {
currentLang := lang
currentLangStr := currentLang.String()
// This may be pt-BR; make it case insensitive.
currentLangKey := strings.ToLower(strings.TrimPrefix(currentLangStr, artificialLangTagPrefix))
localizer := i18n.NewLocalizer(bndl, currentLangStr)
t.translateFuncs[currentLangKey] = func(ctx context.Context, translationID string, templateData any) string {
pluralCount := getPluralCount(templateData)
if templateData != nil {
tp := reflect.TypeOf(templateData)
if hreflect.IsInt(tp.Kind()) {
// This was how go-i18n worked in v1,
// and we keep it like this to avoid breaking
// lots of sites in the wild.
templateData = intCount(cast.ToInt(templateData))
} else {
if p, ok := templateData.(page.Page); ok {
// See issue 10782.
// The i18n has its own template handling and does not know about
// the context.Context.
// A common pattern is to pass Page to i18n, and use .ReadingTime etc.
// We need to improve this, but that requires some upstream changes.
// For now, just creata a wrepper.
templateData = page.PageWithContext{Page: p, Ctx: ctx}
}
}
}
translated, translatedLang, err := localizer.LocalizeWithTag(&i18n.LocalizeConfig{
MessageID: translationID,
TemplateData: templateData,
PluralCount: pluralCount,
})
sameLang := currentLang == translatedLang
if err == nil && sameLang {
return translated
}
if err != nil && sameLang && translated != "" {
// See #8492
// TODO(bep) this needs to be improved/fixed upstream,
// but currently we get an error even if the fallback to
// "other" succeeds.
if fmt.Sprintf("%T", err) == "i18n.pluralFormNotFoundError" {
return translated
}
}
if _, ok := err.(*i18n.MessageNotFoundErr); !ok {
t.logger.Warnf("Failed to get translated string for language %q and ID %q: %s", currentLangStr, translationID, err)
}
if t.cfg.PrintI18nWarnings() {
t.logger.Warnf("i18n|MISSING_TRANSLATION|%s|%s", currentLangStr, translationID)
}
if enableMissingTranslationPlaceholders {
return "[i18n] " + translationID
}
return translated
}
}
}
// intCount wraps the Count method.
type intCount int
func (c intCount) Count() int {
return int(c)
}
const countFieldName = "Count"
// getPluralCount gets the plural count as a string (floats) or an integer.
// If v is nil, nil is returned.
func getPluralCount(v any) any {
if v == nil {
// i18n called without any argument, make sure it does not
// get any plural count.
return nil
}
switch v := v.(type) {
case map[string]any:
for k, vv := range v {
if strings.EqualFold(k, countFieldName) {
return toPluralCountValue(vv)
}
}
default:
vv := reflect.Indirect(reflect.ValueOf(v))
if vv.Kind() == reflect.Interface && !vv.IsNil() {
vv = vv.Elem()
}
tp := vv.Type()
if tp.Kind() == reflect.Struct {
f := vv.FieldByName(countFieldName)
if f.IsValid() {
return toPluralCountValue(f.Interface())
}
m := hreflect.GetMethodByName(vv, countFieldName)
if m.IsValid() && m.Type().NumIn() == 0 && m.Type().NumOut() == 1 {
c := m.Call(nil)
return toPluralCountValue(c[0].Interface())
}
}
}
return toPluralCountValue(v)
}
// go-i18n expects floats to be represented by string.
func toPluralCountValue(in any) any {
k := reflect.TypeOf(in).Kind()
switch {
case hreflect.IsFloat(k):
f := cast.ToString(in)
if !strings.Contains(f, ".") {
f += ".0"
}
return f
case k == reflect.String:
if _, err := cast.ToFloat64E(in); err == nil {
return in
}
// A non-numeric value.
return nil
default:
if i, err := cast.ToIntE(in); err == nil {
return i
}
return nil
}
}
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