/
object_flag.go
87 lines (72 loc) · 1.51 KB
/
object_flag.go
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package codec
import (
"bytes"
"fmt"
"strconv"
"strings"
)
var _ = DefaultObject.
Register("flag", Object{
Type: "flag",
Marshal: flag.Marshal,
Unmarshal: flag.Unmarshal,
})
var flag flagCodec
type flagCodec struct{}
func (flagCodec) Marshal(v interface{}) ([]byte, error) {
obj, keys, err := toobj(v)
if err != nil {
return nil, err
}
var buf bytes.Buffer
for _, k := range keys {
switch v := obj[k].(type) {
case bool:
if v {
fmt.Fprintf(&buf, "%s ", k)
} else {
fmt.Fprintf(&buf, "%s=%t ", k, v)
}
case nil:
fmt.Fprintf(&buf, "%s ", k)
default:
fmt.Fprintf(&buf, "%s=%q ", k, fmt.Sprint(v))
}
}
return bytes.TrimSpace(buf.Bytes()), nil
}
func (flagCodec) Unmarshal(p []byte, v interface{}) error {
var (
args = split(string(p), " ") // fixme: support escaped values
obj = make(map[string]string)
)
for i := 0; i < len(args); {
arg := args[i]
if !strings.HasPrefix(arg, "-") {
return fmt.Errorf("unexpected argument: %q", arg)
}
i = i + 1
if j := strings.IndexRune(arg, '='); j != -1 {
if s, err := strconv.Unquote(arg[j+1:]); err == nil {
obj[arg[:j]] = s
} else {
obj[arg[:j]] = arg[j+1:]
}
} else {
obj[arg] = ""
}
if i < len(args) && !strings.HasPrefix(args[i], "-") {
obj[arg] = args[i] // decode?
i = i + 1
}
}
return reencode(obj, v)
}
func split(s, sep string) (r []string) {
for _, s := range strings.Split(s, sep) {
if s = strings.TrimSpace(s); s != "" {
r = append(r, s)
}
}
return r
}