func decodeArray(s *lex.Scanner) (Element, error) {
var a Array
for s.Next() {
switch s.Token {
case lex.DataToken:
a = append(a, DataString(s.Data))
case lex.ArrayOpen:
el, err := decodeArray(s)
if err != nil {
return nil, err
}
a = append(a, el)
case lex.ArrayClose:
return a, nil
}
}
return nil, ErrMissingClose
}
func decodeDict(s *lex.Scanner) (Element, error) {
d := make(Dict)
for s.Next() {
switch s.Token {
case lex.DataToken:
key := DataString(s.Data)
el, err := decodeElement(s)
if err != nil {
return nil, err
}
d[key] = el
case lex.DictClose:
return d, nil
default:
return nil, ErrBadKeyType
}
}
return nil, ErrMissingClose
}
func decodeElement(s *lex.Scanner) (Element, error) {
if !s.Next() {
return nil, ErrUnexpectedClose
}
switch s.Token {
case lex.DataToken:
return DataString(s.Data), nil
case lex.ArrayOpen:
return decodeArray(s)
case lex.ArrayClose:
return nil, ErrUnexpectedClose
case lex.DictOpen:
return decodeDict(s)
case lex.DictClose:
return nil, ErrUnexpectedClose
}
panic("Unknown lexer token type")
}