151 lines
3.6 KiB
Go
151 lines
3.6 KiB
Go
package dbus
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"reflect"
|
|
"sort"
|
|
"strconv"
|
|
)
|
|
|
|
// Variant represents the D-Bus variant type.
|
|
type Variant struct {
|
|
sig Signature
|
|
value interface{}
|
|
}
|
|
|
|
// MakeVariant converts the given value to a Variant. It panics if v cannot be
|
|
// represented as a D-Bus type.
|
|
func MakeVariant(v interface{}) Variant {
|
|
return MakeVariantWithSignature(v, SignatureOf(v))
|
|
}
|
|
|
|
// MakeVariantWithSignature converts the given value to a Variant.
|
|
func MakeVariantWithSignature(v interface{}, s Signature) Variant {
|
|
return Variant{s, v}
|
|
}
|
|
|
|
// ParseVariant parses the given string as a variant as described at
|
|
// https://developer.gnome.org/glib/stable/gvariant-text.html. If sig is not
|
|
// empty, it is taken to be the expected signature for the variant.
|
|
func ParseVariant(s string, sig Signature) (Variant, error) {
|
|
tokens := varLex(s)
|
|
p := &varParser{tokens: tokens}
|
|
n, err := varMakeNode(p)
|
|
if err != nil {
|
|
return Variant{}, err
|
|
}
|
|
if sig.str == "" {
|
|
sig, err = varInfer(n)
|
|
if err != nil {
|
|
return Variant{}, err
|
|
}
|
|
}
|
|
v, err := n.Value(sig)
|
|
if err != nil {
|
|
return Variant{}, err
|
|
}
|
|
return MakeVariant(v), nil
|
|
}
|
|
|
|
// format returns a formatted version of v and whether this string can be parsed
|
|
// unambiguously.
|
|
func (v Variant) format() (string, bool) {
|
|
switch v.sig.str[0] {
|
|
case 'b', 'i':
|
|
return fmt.Sprint(v.value), true
|
|
case 'n', 'q', 'u', 'x', 't', 'd', 'h':
|
|
return fmt.Sprint(v.value), false
|
|
case 's':
|
|
return strconv.Quote(v.value.(string)), true
|
|
case 'o':
|
|
return strconv.Quote(string(v.value.(ObjectPath))), false
|
|
case 'g':
|
|
return strconv.Quote(v.value.(Signature).str), false
|
|
case 'v':
|
|
s, unamb := v.value.(Variant).format()
|
|
if !unamb {
|
|
return "<@" + v.value.(Variant).sig.str + " " + s + ">", true
|
|
}
|
|
return "<" + s + ">", true
|
|
case 'y':
|
|
return fmt.Sprintf("%#x", v.value.(byte)), false
|
|
}
|
|
rv := reflect.ValueOf(v.value)
|
|
switch rv.Kind() {
|
|
case reflect.Slice:
|
|
if rv.Len() == 0 {
|
|
return "[]", false
|
|
}
|
|
unamb := true
|
|
buf := bytes.NewBuffer([]byte("["))
|
|
for i := 0; i < rv.Len(); i++ {
|
|
// TODO: slooow
|
|
s, b := MakeVariant(rv.Index(i).Interface()).format()
|
|
unamb = unamb && b
|
|
buf.WriteString(s)
|
|
if i != rv.Len()-1 {
|
|
buf.WriteString(", ")
|
|
}
|
|
}
|
|
buf.WriteByte(']')
|
|
return buf.String(), unamb
|
|
case reflect.Map:
|
|
if rv.Len() == 0 {
|
|
return "{}", false
|
|
}
|
|
unamb := true
|
|
var buf bytes.Buffer
|
|
kvs := make([]string, rv.Len())
|
|
for i, k := range rv.MapKeys() {
|
|
s, b := MakeVariant(k.Interface()).format()
|
|
unamb = unamb && b
|
|
buf.Reset()
|
|
buf.WriteString(s)
|
|
buf.WriteString(": ")
|
|
s, b = MakeVariant(rv.MapIndex(k).Interface()).format()
|
|
unamb = unamb && b
|
|
buf.WriteString(s)
|
|
kvs[i] = buf.String()
|
|
}
|
|
buf.Reset()
|
|
buf.WriteByte('{')
|
|
sort.Strings(kvs)
|
|
for i, kv := range kvs {
|
|
if i > 0 {
|
|
buf.WriteString(", ")
|
|
}
|
|
buf.WriteString(kv)
|
|
}
|
|
buf.WriteByte('}')
|
|
return buf.String(), unamb
|
|
}
|
|
return `"INVALID"`, true
|
|
}
|
|
|
|
// Signature returns the D-Bus signature of the underlying value of v.
|
|
func (v Variant) Signature() Signature {
|
|
return v.sig
|
|
}
|
|
|
|
// String returns the string representation of the underlying value of v as
|
|
// described at https://developer.gnome.org/glib/stable/gvariant-text.html.
|
|
func (v Variant) String() string {
|
|
s, unamb := v.format()
|
|
if !unamb {
|
|
return "@" + v.sig.str + " " + s
|
|
}
|
|
return s
|
|
}
|
|
|
|
// Value returns the underlying value of v.
|
|
func (v Variant) Value() interface{} {
|
|
return v.value
|
|
}
|
|
|
|
// Store converts the variant into a native go type using the same
|
|
// mechanism as the "Store" function.
|
|
func (v Variant) Store(value interface{}) error {
|
|
return storeInterfaces(v.value, value)
|
|
}
|