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package vcard
import (
"strings"
)
// See https://github.com/mangstadt/ez-vcard/wiki/Version-differences
// ToV4 converts a card to vCard version 4.
func ToV4(card Card) {
version := card.Value(FieldVersion)
if strings.HasPrefix(version, "4.") {
return
}
card.SetValue(FieldVersion, "4.0")
for k, fields := range card {
if strings.EqualFold(k, FieldVersion) {
continue
}
for _, f := range fields {
if f.Params.HasType("pref") {
delete(f.Params, "pref")
f.Params.Set("pref", "1")
}
}
}
}
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