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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package reflect_test
import (
"bytes"
"go/ast"
"go/token"
"io"
. "reflect"
"testing"
"unsafe"
)
func TestImplicitMapConversion(t *testing.T) {
// Test implicit conversions in MapIndex and SetMapIndex.
{
// direct
m := make(map[int]int)
mv := ValueOf(m)
mv.SetMapIndex(ValueOf(1), ValueOf(2))
x, ok := m[1]
if x != 2 {
t.Errorf("#1 after SetMapIndex(1,2): %d, %t (map=%v)", x, ok, m)
}
if n := mv.MapIndex(ValueOf(1)).Interface().(int); n != 2 {
t.Errorf("#1 MapIndex(1) = %d", n)
}
}
{
// convert interface key
m := make(map[any]int)
mv := ValueOf(m)
mv.SetMapIndex(ValueOf(1), ValueOf(2))
x, ok := m[1]
if x != 2 {
t.Errorf("#2 after SetMapIndex(1,2): %d, %t (map=%v)", x, ok, m)
}
if n := mv.MapIndex(ValueOf(1)).Interface().(int); n != 2 {
t.Errorf("#2 MapIndex(1) = %d", n)
}
}
{
// convert interface value
m := make(map[int]any)
mv := ValueOf(m)
mv.SetMapIndex(ValueOf(1), ValueOf(2))
x, ok := m[1]
if x != 2 {
t.Errorf("#3 after SetMapIndex(1,2): %d, %t (map=%v)", x, ok, m)
}
if n := mv.MapIndex(ValueOf(1)).Interface().(int); n != 2 {
t.Errorf("#3 MapIndex(1) = %d", n)
}
}
{
// convert both interface key and interface value
m := make(map[any]any)
mv := ValueOf(m)
mv.SetMapIndex(ValueOf(1), ValueOf(2))
x, ok := m[1]
if x != 2 {
t.Errorf("#4 after SetMapIndex(1,2): %d, %t (map=%v)", x, ok, m)
}
if n := mv.MapIndex(ValueOf(1)).Interface().(int); n != 2 {
t.Errorf("#4 MapIndex(1) = %d", n)
}
}
{
// convert both, with non-empty interfaces
m := make(map[io.Reader]io.Writer)
mv := ValueOf(m)
b1 := new(bytes.Buffer)
b2 := new(bytes.Buffer)
mv.SetMapIndex(ValueOf(b1), ValueOf(b2))
x, ok := m[b1]
if x != b2 {
t.Errorf("#5 after SetMapIndex(b1, b2): %p (!= %p), %t (map=%v)", x, b2, ok, m)
}
if p := mv.MapIndex(ValueOf(b1)).Elem().UnsafePointer(); p != unsafe.Pointer(b2) {
t.Errorf("#5 MapIndex(b1) = %#x want %p", p, b2)
}
}
{
// convert channel direction
m := make(map[<-chan int]chan int)
mv := ValueOf(m)
c1 := make(chan int)
c2 := make(chan int)
mv.SetMapIndex(ValueOf(c1), ValueOf(c2))
x, ok := m[c1]
if x != c2 {
t.Errorf("#6 after SetMapIndex(c1, c2): %p (!= %p), %t (map=%v)", x, c2, ok, m)
}
if p := mv.MapIndex(ValueOf(c1)).UnsafePointer(); p != ValueOf(c2).UnsafePointer() {
t.Errorf("#6 MapIndex(c1) = %#x want %p", p, c2)
}
}
{
// convert identical underlying types
type MyBuffer bytes.Buffer
m := make(map[*MyBuffer]*bytes.Buffer)
mv := ValueOf(m)
b1 := new(MyBuffer)
b2 := new(bytes.Buffer)
mv.SetMapIndex(ValueOf(b1), ValueOf(b2))
x, ok := m[b1]
if x != b2 {
t.Errorf("#7 after SetMapIndex(b1, b2): %p (!= %p), %t (map=%v)", x, b2, ok, m)
}
if p := mv.MapIndex(ValueOf(b1)).UnsafePointer(); p != unsafe.Pointer(b2) {
t.Errorf("#7 MapIndex(b1) = %#x want %p", p, b2)
}
}
}
func TestImplicitSetConversion(t *testing.T) {
// Assume TestImplicitMapConversion covered the basics.
// Just make sure conversions are being applied at all.
var r io.Reader
b := new(bytes.Buffer)
rv := ValueOf(&r).Elem()
rv.Set(ValueOf(b))
if r != b {
t.Errorf("after Set: r=%T(%v)", r, r)
}
}
func TestImplicitSendConversion(t *testing.T) {
c := make(chan io.Reader, 10)
b := new(bytes.Buffer)
ValueOf(c).Send(ValueOf(b))
if bb := <-c; bb != b {
t.Errorf("Received %p != %p", bb, b)
}
}
func TestImplicitCallConversion(t *testing.T) {
// Arguments must be assignable to parameter types.
fv := ValueOf(io.WriteString)
b := new(bytes.Buffer)
fv.Call([]Value{ValueOf(b), ValueOf("hello world")})
if b.String() != "hello world" {
t.Errorf("After call: string=%q want %q", b.String(), "hello world")
}
}
func TestImplicitAppendConversion(t *testing.T) {
// Arguments must be assignable to the slice's element type.
s := []io.Reader{}
sv := ValueOf(&s).Elem()
b := new(bytes.Buffer)
sv.Set(Append(sv, ValueOf(b)))
if len(s) != 1 || s[0] != b {
t.Errorf("after append: s=%v want [%p]", s, b)
}
}
var implementsTests = []struct {
x any
t any
b bool
}{
{new(*bytes.Buffer), new(io.Reader), true},
{new(bytes.Buffer), new(io.Reader), false},
{new(*bytes.Buffer), new(io.ReaderAt), false},
{new(*ast.Ident), new(ast.Expr), true},
{new(*notAnExpr), new(ast.Expr), false},
{new(*ast.Ident), new(notASTExpr), false},
{new(notASTExpr), new(ast.Expr), false},
{new(ast.Expr), new(notASTExpr), false},
{new(*notAnExpr), new(notASTExpr), true},
}
type notAnExpr struct{}
func (notAnExpr) Pos() token.Pos { return token.NoPos }
func (notAnExpr) End() token.Pos { return token.NoPos }
func (notAnExpr) exprNode() {}
type notASTExpr interface {
Pos() token.Pos
End() token.Pos
exprNode()
}
func TestImplements(t *testing.T) {
for _, tt := range implementsTests {
xv := TypeOf(tt.x).Elem()
xt := TypeOf(tt.t).Elem()
if b := xv.Implements(xt); b != tt.b {
t.Errorf("(%s).Implements(%s) = %v, want %v", xv.String(), xt.String(), b, tt.b)
}
}
}
var assignableTests = []struct {
x any
t any
b bool
}{
{new(chan int), new(<-chan int), true},
{new(<-chan int), new(chan int), false},
{new(*int), new(IntPtr), true},
{new(IntPtr), new(*int), true},
{new(IntPtr), new(IntPtr1), false},
{new(Ch), new(<-chan any), true},
// test runs implementsTests too
}
type IntPtr *int
type IntPtr1 *int
type Ch <-chan any
func TestAssignableTo(t *testing.T) {
for _, tt := range append(assignableTests, implementsTests...) {
xv := TypeOf(tt.x).Elem()
xt := TypeOf(tt.t).Elem()
if b := xv.AssignableTo(xt); b != tt.b {
t.Errorf("(%s).AssignableTo(%s) = %v, want %v", xv.String(), xt.String(), b, tt.b)
}
}
}
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