forked from nicksnyder/go-i18n
/
pluralspec.go
264 lines (242 loc) · 5.07 KB
/
pluralspec.go
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package language
import "strings"
// PluralSpec defines the CLDR plural rules for a language.
// http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html
// http://unicode.org/reports/tr35/tr35-numbers.html#Operands
type PluralSpec struct {
Plurals map[Plural]struct{}
PluralFunc func(*operands) Plural
}
// Plural returns the plural category for number as defined by
// the language's CLDR plural rules.
func (ps *PluralSpec) Plural(number interface{}) (Plural, error) {
ops, err := newOperands(number)
if err != nil {
return Invalid, err
}
return ps.PluralFunc(ops), nil
}
// getPluralSpec returns the PluralSpec that matches the longest prefix of tag.
// It returns nil if no PluralSpec matches tag.
func getPluralSpec(tag string) *PluralSpec {
tag = NormalizeTag(tag)
subtag := tag
for {
if spec := pluralSpecs[subtag]; spec != nil {
return spec
}
end := strings.LastIndex(subtag, "-")
if end == -1 {
return nil
}
subtag = subtag[:end]
}
}
// Alphabetical by English name.
var pluralSpecs = map[string]*PluralSpec{
// Arabic
"ar": &PluralSpec{
Plurals: newPluralSet(Zero, One, Two, Few, Many, Other),
PluralFunc: func(ops *operands) Plural {
if ops.W == 0 {
switch ops.I {
case 0:
return Zero
case 1:
return One
case 2:
return Two
default:
mod100 := ops.I % 100
if mod100 >= 3 && mod100 <= 10 {
return Few
}
if mod100 >= 11 {
return Many
}
}
}
return Other
},
},
// Catalan
"ca": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 && ops.V == 0 {
return One
}
return Other
},
},
// Chinese
// There is no need to distinguish between simplified and traditional
// since they have the same pluralization.
"zh": &PluralSpec{
Plurals: newPluralSet(Other),
PluralFunc: func(ops *operands) Plural {
return Other
},
},
// Czech
"cs": &PluralSpec{
Plurals: newPluralSet(One, Few, Many, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 && ops.V == 0 {
return One
}
if ops.I >= 2 && ops.I <= 4 && ops.V == 0 {
return Few
}
if ops.V > 0 {
return Many
}
return Other
},
},
// Danish
"da": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 || (ops.I == 0 && ops.T != 0) {
return One
}
return Other
},
},
// Dutch
"nl": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 && ops.V == 0 {
return One
}
return Other
},
},
// English
"en": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 && ops.V == 0 {
return One
}
return Other
},
},
// French
"fr": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 0 || ops.I == 1 {
return One
}
return Other
},
},
// German
"de": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 && ops.V == 0 {
return One
}
return Other
},
},
// Icelandic
"is": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if (ops.T == 0 && ops.I % 10 == 1 && ops.I % 100 != 11) || ops.T != 0 {
return One
}
return Other
},
},
// Italian
"it": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 && ops.V == 0 {
return One
}
return Other
},
},
// Japanese
"ja": &PluralSpec{
Plurals: newPluralSet(Other),
PluralFunc: func(ops *operands) Plural {
return Other
},
},
// Lithuanian
"lt": &PluralSpec{
Plurals: newPluralSet(One, Few, Many, Other),
PluralFunc: func(ops *operands) Plural {
if ops.F != 0 {
return Many
}
mod100 := ops.I % 100
if mod100 < 11 || mod100 > 19 {
switch ops.I % 10 {
case 0:
return Other
case 1:
return One
default:
return Few
}
}
return Other
},
},
// Portuguese (European)
"pt": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 && ops.V == 0 {
return One
}
return Other
},
},
// Portuguese (Brazilian)
"pt-br": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if (ops.I == 1 && ops.V == 0) || (ops.I == 0 && ops.T == 1) {
return One
}
return Other
},
},
// Spanish
"es": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 && ops.W == 0 {
return One
}
return Other
},
},
// Bulgarian
"bg": &PluralSpec{
Plurals: newPluralSet(One, Other),
PluralFunc: func(ops *operands) Plural {
if ops.I == 1 && ops.W == 0 {
return One
}
return Other
},
},
}
func newPluralSet(plurals ...Plural) map[Plural]struct{} {
set := make(map[Plural]struct{}, len(plurals))
for _, plural := range plurals {
set[plural] = struct{}{}
}
return set
}