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// Package i18n implements utility functions for internationalization
package i18n
import "strings"
// GetLanguageMatched uses a map from language tags to strings to extract the right language given the tag
// It implements it according to https://github.com/eduvpn/documentation/blob/dc4d53c47dd7a69e95d6650eec408e16eaa814a2/SERVER_DISCOVERY.md#language-matching
func GetLanguageMatched(langMap map[string]string, langTag string) string {
// If no map is given, return the empty string
if len(langMap) == 0 {
return ""
}
// Try to find the exact match
if val, ok := langMap[langTag]; ok {
return val
}
// Try to find a key that starts with the OS language setting
for k := range langMap {
if strings.HasPrefix(k, langTag) {
return langMap[k]
}
}
// Try to find a key that starts with the first part of the OS language (e.g. de-)
pts := strings.Split(langTag, "-")
// We have a "-"
if len(pts) > 1 {
for k := range langMap {
if strings.HasPrefix(k, pts[0]+"-") {
return langMap[k]
}
}
}
// search for just the language (e.g. de)
for k := range langMap {
if k == pts[0] {
return langMap[k]
}
}
// Pick one that is deemed best, e.g. en-US or en, but note that not all languages are always available!
// We force an entry that is english exactly or with an english prefix
for k := range langMap {
if k == "en" || strings.HasPrefix(k, "en-") {
return langMap[k]
}
}
// Otherwise just return one
for k := range langMap {
return langMap[k]
}
return ""
}
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