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