Support unexported types

[GeertJohan]

I have a package with several types that must be unexported, but are marshalled/unmarshalled to/from json. Running ffjson returns several errors:

> ffjson server.gen.go
Error: Go Run Failed for: /tmp/ffjson-inception430580992.go
STDOUT:

STDERR:
# command-line-arguments
/tmp/ffjson-inception430580992.go:19: cannot refer to unexported name chatservice.angoInMsg
/tmp/ffjson-inception430580992.go:21: cannot refer to unexported name chatservice.angoClientArgsDataDisplayNotification
/tmp/ffjson-inception430580992.go:23: cannot refer to unexported name chatservice.angoServerArgsDataAdd8
/tmp/ffjson-inception430580992.go:25: cannot refer to unexported name chatservice.angoServerRetsDataDostuff
/tmp/ffjson-inception430580992.go:27: cannot refer to unexported name chatservice.angoOutMsg
/tmp/ffjson-inception430580992.go:29: cannot refer to unexported name chatservice.angoClientRetsDataAskQuestion
/tmp/ffjson-inception430580992.go:31: cannot refer to unexported name chatservice.angoServerArgsDataDostuff
/tmp/ffjson-inception430580992.go:33: cannot refer to unexported name chatservice.angoOutError
/tmp/ffjson-inception430580992.go:37: cannot refer to unexported name chatservice.angoServerArgsDataAdd
/tmp/ffjson-inception430580992.go:39: cannot refer to unexported name chatservice.angoServerRetsDataAdd8
/tmp/ffjson-inception430580992.go:39: too many errors

:

I believe that creating ffjson with unexported types should be possible.

[pquerna]

Can you give me a small example struct that does this?

[pquerna]

eg, under encoding/json, unexported types are not Marshalled, even if they have JSON tags:

http://play.golang.org/p/O8bS4JRfO0

[GeertJohan]

Sure!
http://play.golang.org/p/WIZ8gDUsAi

[GeertJohan]

The play example shows how an unexported type can still be marshalled itself.. Fields in the struct type must be exported ofcourse.

The situation I have is a bit different than the play example. In my case I have packages (not main/command) that have unexported types which are being marshalled to json by that package itself. The smallest example I can give of this is:

package mypkg

import "os"
import "encoding/json"

type unexported struct {
    Exported string
}

func DoStuff() {
    u := &unexported{
        Exported: "foobar",
    }
    json.NewEncoder(os.Stdout).Encode(u)
}

Running ffjson on that file exits with:

Error: Go Run Failed for: /tmp/ffjson-inception660098357.go
STDOUT:

STDERR:
# command-line-arguments
/tmp/ffjson-inception660098357.go:15: cannot refer to unexported name mypkg.unexported
/tmp/ffjson-inception660098357.go:15: undefined: mypkg.unexported

[pquerna]

Ok, cool, this should be easy to fix. Will take a look shortly.

[GeertJohan]

Thanks!