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84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
// Package translation defines the interface for a translation.
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package translation
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import (
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"fmt"
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"github.com/nicksnyder/go-i18n/i18n/language"
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)
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// Translation is the interface that represents a translated string.
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type Translation interface {
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// MarshalInterface returns the object that should be used
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// to serialize the translation.
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MarshalInterface() interface{}
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ID() string
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Template(language.Plural) *template
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UntranslatedCopy() Translation
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Normalize(language *language.Language) Translation
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Backfill(src Translation) Translation
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Merge(Translation) Translation
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Incomplete(l *language.Language) bool
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}
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// SortableByID implements sort.Interface for a slice of translations.
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type SortableByID []Translation
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func (a SortableByID) Len() int { return len(a) }
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func (a SortableByID) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func (a SortableByID) Less(i, j int) bool { return a[i].ID() < a[j].ID() }
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// NewTranslation reflects on data to create a new Translation.
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//
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// data["id"] must be a string and data["translation"] must be either a string
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// for a non-plural translation or a map[string]interface{} for a plural translation.
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func NewTranslation(data map[string]interface{}) (Translation, error) {
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id, ok := data["id"].(string)
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if !ok {
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return nil, fmt.Errorf(`missing "id" key`)
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}
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var pluralObject map[string]interface{}
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switch translation := data["translation"].(type) {
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case string:
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tmpl, err := newTemplate(translation)
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if err != nil {
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return nil, err
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}
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return &singleTranslation{id, tmpl}, nil
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case map[interface{}]interface{}:
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// The YAML parser uses interface{} keys so we first convert them to string keys.
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pluralObject = make(map[string]interface{})
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for k, v := range translation {
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kStr, ok := k.(string)
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if !ok {
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return nil, fmt.Errorf(`invalid plural category type %T; expected string`, k)
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}
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pluralObject[kStr] = v
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}
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case map[string]interface{}:
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pluralObject = translation
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case nil:
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return nil, fmt.Errorf(`missing "translation" key`)
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default:
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return nil, fmt.Errorf(`unsupported type for "translation" key %T`, translation)
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}
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templates := make(map[language.Plural]*template, len(pluralObject))
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for k, v := range pluralObject {
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pc, err := language.NewPlural(k)
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if err != nil {
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return nil, err
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}
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str, ok := v.(string)
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if !ok {
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return nil, fmt.Errorf(`plural category "%s" has value of type %T; expected string`, pc, v)
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}
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tmpl, err := newTemplate(str)
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if err != nil {
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return nil, err
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}
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templates[pc] = tmpl
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}
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return &pluralTranslation{id, templates}, nil
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}
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