package ucca

import "strings"

// normalizeGerman lowercases and folds German umlauts / ß to their ASCII digraphs
// (ä→ae, ö→oe, ü→ue, ß→ss) so keyword matching is insensitive to whether the user
// typed "Prüfe" or "Pruefe", "Datenschutzerklärung" or "Datenschutzerklaerung".
// Applied to BOTH the query and the keyword lists in the German-text matchers.
func normalizeGerman(s string) string {
	return umlautFolder.Replace(strings.ToLower(s))
}

var umlautFolder = strings.NewReplacer(
	"ä", "ae", "ö", "oe", "ü", "ue", "ß", "ss",
)