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language.go
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language.go
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// Package language defines languages that implement CLDR pluralization.
package language
import (
"github.com/goinggo/beego-mgo/go-i18n/i18n/plural"
)
// Language is a written human language.
//
// Languages are identified by tags defined by RFC 5646.
//
// Typically language tags are a 2 character language code (ISO 639-1)
// optionally followed by a dash and a 2 character country code (ISO 3166-1).
// (e.g. en, pt-BR)
//
// A Language implements CLDR plural rules as defined here:
// http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html
// http://unicode.org/reports/tr35/tr35-numbers.html#Operands
type Language struct {
ID string
Name string
PluralCategories map[plural.Category]struct{}
PluralFunc func(*plural.Operands) plural.Category
}
// Alphabetical by English name.
var languages = map[string]*Language{
// Arabic
"ar": &Language{
ID: "ar",
PluralCategories: newSet(plural.Zero, plural.One, plural.Two, plural.Few, plural.Many, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.W == 0 {
// Integer case
switch ops.I {
case 0:
return plural.Zero
case 1:
return plural.One
case 2:
return plural.Two
default:
mod100 := ops.I % 100
if mod100 >= 3 && mod100 <= 10 {
return plural.Few
}
if mod100 >= 11 {
return plural.Many
}
}
}
return plural.Other
},
},
// Catalan
"ca": &Language{
ID: "ca",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 1 && ops.V == 0 {
return plural.One
}
return plural.Other
},
},
// Chinese
// There is no need to distinguish between simplified and traditional
// since they have the same pluralization.
"zh": &Language{
ID: "zh",
PluralCategories: newSet(plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
return plural.Other
},
},
// Czech
"cs": &Language{
ID: "cs",
PluralCategories: newSet(plural.One, plural.Few, plural.Many, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 1 && ops.V == 0 {
return plural.One
}
if ops.I >= 2 && ops.I <= 4 && ops.V == 0 {
return plural.Few
}
if ops.V > 0 {
return plural.Many
}
return plural.Other
},
},
// Danish
"da": &Language{
ID: "da",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 1 || (ops.I == 0 && ops.T != 0) {
return plural.One
}
return plural.Other
},
},
// Dutch
"nl": &Language{
ID: "nl",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 1 && ops.V == 0 {
return plural.One
}
return plural.Other
},
},
// English
"en": &Language{
ID: "en",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 1 && ops.V == 0 {
return plural.One
}
return plural.Other
},
},
// French
"fr": &Language{
ID: "fr",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 0 || ops.I == 1 {
return plural.One
}
return plural.Other
},
},
// German
"de": &Language{
ID: "de",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 1 && ops.V == 0 {
return plural.One
}
return plural.Other
},
},
// Italian
"it": &Language{
ID: "it",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 1 && ops.V == 0 {
return plural.One
}
return plural.Other
},
},
// Japanese
"ja": &Language{
ID: "ja",
PluralCategories: newSet(plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
return plural.Other
},
},
// Portuguese (European)
"pt": &Language{
ID: "pt",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 1 && ops.V == 0 {
return plural.One
}
return plural.Other
},
},
// Portuguese (Brazilian)
"pt-BR": &Language{
ID: "pt-BR",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if (ops.I == 1 && ops.V == 0) || (ops.I == 0 && ops.T == 1) {
return plural.One
}
return plural.Other
},
},
// Spanish
"es": &Language{
ID: "es",
PluralCategories: newSet(plural.One, plural.Other),
PluralFunc: func(ops *plural.Operands) plural.Category {
if ops.I == 1 && ops.W == 0 {
return plural.One
}
return plural.Other
},
},
}
// LanguageWithID returns the language identified by id
// or nil if the language is not registered.
func LanguageWithID(id string) *Language {
return languages[id]
}
// Register adds Language l to the collection of available languages.
func Register(l *Language) {
languages[l.ID] = l
}
// PluralCategory returns the plural category for number as defined by
// the language's CLDR plural rules.
func (l *Language) PluralCategory(number interface{}) (plural.Category, error) {
ops, err := plural.NewOperands(number)
if err != nil {
return plural.Invalid, err
}
return l.PluralFunc(ops), nil
}
func (l *Language) String() string {
return l.ID
}
func newSet(pluralCategories ...plural.Category) map[plural.Category]struct{} {
set := make(map[plural.Category]struct{}, len(pluralCategories))
for _, pc := range pluralCategories {
set[pc] = struct{}{}
}
return set
}