"golang.org/x/tools/internal/aliases"
)

// ReceiverNamed returns the named type (if any) associated with the
// type of recv, which may be of the form N or *N, or aliases thereof.
// It also reports whether a Pointer was present.
func ReceiverNamed(recv *types.Var) (isPtr bool, named *types.Named) {
	t := recv.Type()
	if ptr, ok := aliases.Unalias(t).(*types.Pointer); ok {
		isPtr = true
		t = ptr.Elem()
	}

				}
				if cause != "" {
					check.errorf(recv, InvalidRecv, "invalid receiver type %s (%s)", rtyp, cause)
				}
			case *Basic:
				check.errorf(recv, InvalidRecv, "cannot define new methods on non-local type %s", rtyp)
			default:
				check.errorf(recv, InvalidRecv, "invalid receiver type %s", recv.typ)
			}
		}).describef(recv, "validate receiver %s", recv)
	}

	sig.params = NewTuple(params...)

//
// Example: "(*Buffer).Grow" -> (true, "Buffer", "Grow")
func (sym *Symbol) SplitMethod() (ptr bool, recv, name string) {
	if sym.Kind != Method {
		panic("not a method")
	}
	recv, name, _ = strings.Cut(sym.Name, ".")
	recv = recv[len("(") : len(recv)-len(")")]
	ptr = recv[0] == '*'
	if ptr {
		recv = recv[len("*"):]
	}
	return

func (s *Selection) Type() Type {
	switch s.kind {
	case MethodVal:
		// The type of x.f is a method with its receiver type set
		// to the type of x.
		sig := *s.obj.(*Func).typ.(*Signature)
		recv := *sig.recv
		recv.typ = s.recv
		sig.recv = &recv
		return &sig

	case MethodExpr:
		// The type of x.f is a function (without receiver)
		// and an additional first argument with the same type as x.

// expression "recv.sym".
func NewMethodExpr(pos src.XPos, recv *types.Type, sym *types.Sym) *ir.SelectorExpr {
	// Compute the method set for recv.
	var ms []*types.Field
	if recv.IsInterface() {
		ms = recv.AllMethods()
	} else {
		mt := types.ReceiverBaseType(recv)
		if mt == nil {
			base.FatalfAt(pos, "type %v has no receiver base type", recv)
		}
		CalcMethods(mt)

		argidx := -1

		recv := fn.Type().(*types.Signature).Recv()
		if fn.Name() == "Unmarshal" && recv == nil {
			// "encoding/json".Unmarshal
			// "encoding/xml".Unmarshal
			// "encoding/asn1".Unmarshal
			switch fn.Pkg().Path() {
			case "encoding/json", "encoding/xml", "encoding/asn1":
				argidx = 1 // func([]byte, interface{})
			}
		} else if fn.Name() == "Decode" && recv != nil {

//	"slog.Logger.With" (instead of "(*log/slog.Logger).With")
func shortName(fn *types.Func) string {
	var r string
	if recv := fn.Type().(*types.Signature).Recv(); recv != nil {
		if _, named := typesinternal.ReceiverNamed(recv); named != nil {
			r = named.Obj().Name()
		} else {
			r = recv.Type().String() // anon struct/interface
		}
		r += "."
	}
	return fmt.Sprintf("%s.%s%s", fn.Pkg().Name(), r, fn.Name())
}

// parameters, and results, any of which may be nil.
func NewSignature(recv *Field, params, results []*Field) *Type {
	startParams := 0
	if recv != nil {
		startParams = 1
	}
	startResults := startParams + len(params)

	allParams := make([]*Field, startResults+len(results))
	if recv != nil {
		allParams[0] = recv
	}
	copy(allParams[startParams:], params)
	copy(allParams[startResults:], results)

		if name == "comment" {
			return "go/doc/comment", true
		}
		return DefaultLookupPackage(name)
	}
	p.LookupSym = func(recv, name string) (ok bool) {
		if recv == "Parser" && name == "Parse" ||
			recv == "" && name == "Doc" ||
			recv == "" && name == "NoURL" {
			return true
		}
		return false
	}

	stripDollars := func(b []byte) []byte {
		// Remove trailing $ on lines.

func isTimeDotFormat(f *types.Func) bool {
	if f.Name() != "Format" || f.Pkg() == nil || f.Pkg().Path() != "time" {
		return false
	}
	// Verify that the receiver is time.Time.
	recv := f.Type().(*types.Signature).Recv()
	return recv != nil && analysisutil.IsNamedType(recv.Type(), "time", "Time")
}

func isTimeDotParse(f *types.Func) bool {
	return analysisutil.IsFunctionNamed(f, "time", "Parse")
}