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75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
package language
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import "strings"
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// PluralSpec defines the CLDR plural rules for a language.
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// http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html
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// http://unicode.org/reports/tr35/tr35-numbers.html#Operands
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type PluralSpec struct {
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Plurals map[Plural]struct{}
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PluralFunc func(*operands) Plural
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}
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var pluralSpecs = make(map[string]*PluralSpec)
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func normalizePluralSpecID(id string) string {
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id = strings.Replace(id, "_", "-", -1)
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id = strings.ToLower(id)
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return id
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}
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func registerPluralSpec(ids []string, ps *PluralSpec) {
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for _, id := range ids {
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id = normalizePluralSpecID(id)
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pluralSpecs[id] = ps
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}
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}
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// Plural returns the plural category for number as defined by
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// the language's CLDR plural rules.
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func (ps *PluralSpec) Plural(number interface{}) (Plural, error) {
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ops, err := newOperands(number)
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if err != nil {
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return Invalid, err
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}
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return ps.PluralFunc(ops), nil
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}
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// getPluralSpec returns the PluralSpec that matches the longest prefix of tag.
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// It returns nil if no PluralSpec matches tag.
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func getPluralSpec(tag string) *PluralSpec {
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tag = NormalizeTag(tag)
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subtag := tag
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for {
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if spec := pluralSpecs[subtag]; spec != nil {
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return spec
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}
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end := strings.LastIndex(subtag, "-")
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if end == -1 {
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return nil
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}
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subtag = subtag[:end]
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}
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}
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func newPluralSet(plurals ...Plural) map[Plural]struct{} {
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set := make(map[Plural]struct{}, len(plurals))
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for _, plural := range plurals {
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set[plural] = struct{}{}
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}
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return set
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}
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func intInRange(i, from, to int64) bool {
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return from <= i && i <= to
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}
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func intEqualsAny(i int64, any ...int64) bool {
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for _, a := range any {
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if i == a {
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return true
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}
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}
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return false
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}
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