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package vcard
import (
"errors"
"io"
"sort"
"strings"
)
// An Encoder formats cards.
type Encoder struct {
w io.Writer
}
// NewEncoder creates a new Encoder that writes cards to w.
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{w}
}
// Encode formats a card. The card must have a FieldVersion field.
func (enc *Encoder) Encode(c Card) error {
begin := "BEGIN:VCARD\r\n"
if _, err := io.WriteString(enc.w, begin); err != nil {
return err
}
version := c.Get(FieldVersion)
if version == nil {
return errors.New("vcard: VERSION field missing")
}
if _, err := io.WriteString(enc.w, formatLine(FieldVersion, version)+"\r\n"); err != nil {
return err
}
var keys []string
for k := range c {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
fields := c[k]
if strings.EqualFold(k, FieldVersion) {
continue
}
for _, f := range fields {
if _, err := io.WriteString(enc.w, formatLine(k, f)+"\r\n"); err != nil {
return err
}
}
}
end := "END:VCARD\r\n"
_, err := io.WriteString(enc.w, end)
return err
}
func formatLine(key string, field *Field) string {
var s string
if field.Group != "" {
s += field.Group + "."
}
s += key
for pk, pvs := range field.Params {
for _, pv := range pvs {
s += ";" + formatParam(pk, pv)
}
}
s += ":" + formatValue(field.Value)
return s
}
func formatParam(k, v string) string {
return k + "=" + formatValue(v)
}
var valueFormatter = strings.NewReplacer("\\", "\\\\", "\n", "\\n", ",", "\\,")
func formatValue(v string) string {
return valueFormatter.Replace(v)
}
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