func tokenOf(o types.Object) string {
switch o := o.(type) {
case *types.Func:
return "func"
case *types.Var:
return "var"
case *types.TypeName:
return "type"
case *types.Const:
return "const"
case *types.PkgName:
return "package"
case *types.Builtin:
return "builtin" // e.g. when describing package "unsafe"
case *types.Nil:
return "nil"
case *types.Label:
return "label"
case *types.Alias:
if o.Orig() == nil {
return "alias"
}
return tokenOf(o.Orig())
}
panic(o)
}
func formatMember(obj types.Object, maxname int) string {
qualifier := types.RelativeTo(obj.Pkg())
var buf bytes.Buffer
fmt.Fprintf(&buf, "%-5s %-*s", tokenOf(obj), maxname, obj.Name())
switch obj := obj.(type) {
case *types.Alias:
buf.WriteString(" => ")
if orig := obj.Orig(); orig != nil {
fmt.Fprintf(&buf, "%s.%s", orig.Pkg().Name(), orig.Name())
} else {
buf.WriteByte('?')
}
case *types.Const:
fmt.Fprintf(&buf, " %s = %s", types.TypeString(obj.Type(), qualifier), obj.Val())
case *types.Func:
fmt.Fprintf(&buf, " %s", types.TypeString(obj.Type(), qualifier))
case *types.TypeName:
// Abbreviate long aggregate type names.
var abbrev string
switch t := obj.Type().Underlying().(type) {
case *types.Interface:
if t.NumMethods() > 1 {
abbrev = "interface{...}"
}
case *types.Struct:
if t.NumFields() > 1 {
abbrev = "struct{...}"
}
}
if abbrev == "" {
fmt.Fprintf(&buf, " %s", types.TypeString(obj.Type().Underlying(), qualifier))
} else {
fmt.Fprintf(&buf, " %s", abbrev)
}
case *types.Var:
fmt.Fprintf(&buf, " %s", types.TypeString(obj.Type(), qualifier))
}
return buf.String()
}