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moby--moby/utils/filters/parse.go
Vincent Batts 3a4e3ca327 filters: don't encode an empty set. update comments
Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
2014-06-02 16:33:52 -04:00

63 lines
1.2 KiB
Go

package filters
import (
"encoding/json"
"errors"
"strings"
)
type Args map[string][]string
// Parse the argument to the filter flag. Like
//
// `docker ps -f 'created=today' -f 'image.name=ubuntu*'`
//
// If prev map is provided, then it is appended to, and returned. By default a new
// map is created.
func ParseFlag(arg string, prev Args) (Args, error) {
var filters Args = prev
if prev == nil {
filters = Args{}
}
if len(arg) == 0 {
return filters, nil
}
if !strings.Contains(arg, "=") {
return filters, ErrorBadFormat
}
f := strings.SplitN(arg, "=", 2)
filters[f[0]] = append(filters[f[0]], f[1])
return filters, nil
}
var ErrorBadFormat = errors.New("bad format of filter (expected name=value)")
// packs the Args into an string for easy transport from client to server
func ToParam(a Args) (string, error) {
// this way we don't URL encode {}, just empty space
if len(a) == 0 {
return "", nil
}
buf, err := json.Marshal(a)
if err != nil {
return "", err
}
return string(buf), nil
}
// unpacks the filter Args
func FromParam(p string) (Args, error) {
args := Args{}
if len(p) == 0 {
return args, nil
}
err := json.Unmarshal([]byte(p), &args)
if err != nil {
return nil, err
}
return args, nil
}