func Walk(tv *types.TypeAndValue, v Visitor) bool {
switch {
case tv.IsType():
// Anonymous types may have methods too (e.g.,
// interfaces or structs with embedded fields), but
// the Go spec restricts method expressions to named
// types and pointers to named types.
if namedOf(tv.Type) != nil {
walk(tv.Type, false, false, v)
}
case tv.IsValue():
walk(tv.Type, tv.Addressable(), true, v)
default:
return false
}
return true
}
// stringVal returns the (unquoted) string value and true if
// tv is a string constant; otherwise it returns "" and false.
func stringVal(tv types.TypeAndValue) (string, bool) {
if tv.IsValue() && tv.Value != nil && tv.Value.Kind() == constant.String {
return constant.StringVal(tv.Value), true
}
return "", false
}
// mode returns a string describing the mode of an expression.
func mode(tv types.TypeAndValue) string {
s := ""
if tv.IsVoid() {
s += ",void"
}
if tv.IsType() {
s += ",type"
}
if tv.IsBuiltin() {
s += ",builtin"
}
if tv.IsValue() {
s += ",value"
}
if tv.IsNil() {
s += ",nil"
}
if tv.Addressable() {
s += ",addressable"
}
if tv.Assignable() {
s += ",assignable"
}
if tv.HasOk() {
s += ",ok"
}
return s[1:]
}
func mode(tv types.TypeAndValue) string {
switch {
case tv.IsVoid():
return "void"
case tv.IsType():
return "type"
case tv.IsBuiltin():
return "builtin"
case tv.IsNil():
return "nil"
case tv.Assignable():
if tv.Addressable() {
return "var"
}
return "mapindex"
case tv.IsValue():
return "value"
default:
return "unknown"
}
}