i18n: add ITable

pkg/i18n/table.go

@@ -0,0 +1,57 @@
+package i18n
+
+import (
+	"context"
+
+	"golang.org/x/text/language"
+)
+
+type ITable interface {
+	Lookup(ctx context.Context, key string) string
+}
+
+type TableEntry map[language.Tag]string
+type Table map[string]TableEntry
+
+func NewTableEntry() TableEntry {
+	return TableEntry{}
+}
+
+func (te TableEntry) CN(v string) TableEntry {
+	te[language.Chinese] = v
+	return te
+}
+
+func (te TableEntry) EN(v string) TableEntry {
+	te[language.English] = v
+	return te
+}
+
+func (tbl Table) Set(k string, te TableEntry) {
+	tbl[k] = te
+}
+
+func (tbl Table) Lookup(ctx context.Context, key string) string {
+	te, ok := tbl[key]
+	if !ok {
+		return key
+	}
+	lang := Lang(ctx)
+	lang = tableLangMatch(lang)
+	v, ok := te[lang]
+	if !ok {
+		return key
+	}
+	return v
+}
+
+var tableLangSupported = []language.Tag{
+	language.English,
+	language.Chinese,
+}
+var tableLangMatcher = language.NewMatcher(tableLangSupported)
+
+func tableLangMatch(tag language.Tag) language.Tag {
+	_, i, _ := tableLangMatcher.Match(tag)
+	return tableLangSupported[i]
+}