func (x *exporter) exportObject(obj types.Object) {
switch t := obj.(type) {
case *types.Var:
if !obj.IsExported() {
return
}
x.write("\tvar @\"\".%s ", obj.Name())
x.exportName(obj.Type())
x.write("\n")
case *types.Func:
sig := t.Type().(*types.Signature)
recv := sig.Recv()
if recv == nil && !t.IsExported() {
return
// The package "go/ast" has an interface "Decl" (http://golang.org/pkg/go/ast/#Decl)
// containing "filtered or unexported methods", specifically a method named "declNode".
//
// No implementation of that method actually does anything, but it forces type
// correctness and also disallows other packages from defining new types that
// satisfies that interface.
//
// As the interface is exported and the types implementing the interface are too,
// "declNode" must be exported to be able to properly type check any code that type
// casts from and to that interface.
//
// To be clear; exporting *all* receiver methods is a superset of the methods
// that must be exported.
}
x.write("\tfunc ")
if recv != nil {
x.write("(")
x.exportName(recv)
x.write(") ")
}
x.write(`@"".%s`, t.Name())
x.writeFunc = false
x.exportName(sig)
x.write("\n")
case *types.Const:
if !t.IsExported() {
return
}
x.write("\tconst @\"\".%s ", t.Name())
x.exportName(t.Type())
x.write(" = ")
x.exportName(t.Val())
x.write("\n")
case *types.TypeName:
// Some types that are not exported outside of the package actually
// need to be exported for the compiler.
//
// An example would be a package having an exported struct type
// that has a member variable of some unexported type:
//
// As declaring variables of the exported struct type is allowed
// outside of the package, the compiler needs to know the size
// of the struct.
//
// To be clear; exporting *all* types is a superset of the types
// that must be exported.
x.write("\ttype @\"\".%s ", obj.Name())
x.exportName(obj.Type().Underlying())
x.write("\n")
if u, ok := obj.Type().(*types.Named); ok {
for i := 0; i < u.NumMethods(); i++ {
m := u.Method(i)
x.exportObject(m)
}
}
default:
panic(fmt.Sprintf("UNHANDLED %T", t))
}
}