object_test.go

Documentation: go/types

     1  // Code generated by "go test -run=Generate -write=all"; DO NOT EDIT.
     2  
     3  // Copyright 2016 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package types_test
     8  
     9  import (
    10  	"internal/testenv"
    11  	"strings"
    12  	"testing"
    13  
    14  	. "go/types"
    15  )
    16  
    17  func TestIsAlias(t *testing.T) {
    18  	check := func(obj *TypeName, want bool) {
    19  		if got := obj.IsAlias(); got != want {
    20  			t.Errorf("%v: got IsAlias = %v; want %v", obj, got, want)
    21  		}
    22  	}
    23  
    24  	// predeclared types
    25  	check(Unsafe.Scope().Lookup("Pointer").(*TypeName), false)
    26  	for _, name := range Universe.Names() {
    27  		if obj, _ := Universe.Lookup(name).(*TypeName); obj != nil {
    28  			check(obj, name == "any" || name == "byte" || name == "rune")
    29  		}
    30  	}
    31  
    32  	// various other types
    33  	pkg := NewPackage("p", "p")
    34  	t1 := NewTypeName(nopos, pkg, "t1", nil)
    35  	n1 := NewNamed(t1, new(Struct), nil)
    36  	t5 := NewTypeName(nopos, pkg, "t5", nil)
    37  	NewTypeParam(t5, nil)
    38  	for _, test := range []struct {
    39  		name  *TypeName
    40  		alias bool
    41  	}{
    42  		{NewTypeName(nopos, nil, "t0", nil), false}, // no type yet
    43  		{NewTypeName(nopos, pkg, "t0", nil), false}, // no type yet
    44  		{t1, false}, // type name refers to named type and vice versa
    45  		{NewTypeName(nopos, nil, "t2", NewInterfaceType(nil, nil)), true}, // type name refers to unnamed type
    46  		{NewTypeName(nopos, pkg, "t3", n1), true},                         // type name refers to named type with different type name
    47  		{NewTypeName(nopos, nil, "t4", Typ[Int32]), true},                 // type name refers to basic type with different name
    48  		{NewTypeName(nopos, nil, "int32", Typ[Int32]), false},             // type name refers to basic type with same name
    49  		{NewTypeName(nopos, pkg, "int32", Typ[Int32]), true},              // type name is declared in user-defined package (outside Universe)
    50  		{NewTypeName(nopos, nil, "rune", Typ[Rune]), true},                // type name refers to basic type rune which is an alias already
    51  		{t5, false}, // type name refers to type parameter and vice versa
    52  	} {
    53  		check(test.name, test.alias)
    54  	}
    55  }
    56  
    57  // TestEmbeddedMethod checks that an embedded method is represented by
    58  // the same Func Object as the original method. See also go.dev/issue/34421.
    59  func TestEmbeddedMethod(t *testing.T) {
    60  	const src = `package p; type I interface { error }`
    61  	pkg := mustTypecheck(src, nil, nil)
    62  
    63  	// get original error.Error method
    64  	eface := Universe.Lookup("error")
    65  	orig, _, _ := LookupFieldOrMethod(eface.Type(), false, nil, "Error")
    66  	if orig == nil {
    67  		t.Fatalf("original error.Error not found")
    68  	}
    69  
    70  	// get embedded error.Error method
    71  	iface := pkg.Scope().Lookup("I")
    72  	embed, _, _ := LookupFieldOrMethod(iface.Type(), false, nil, "Error")
    73  	if embed == nil {
    74  		t.Fatalf("embedded error.Error not found")
    75  	}
    76  
    77  	// original and embedded Error object should be identical
    78  	if orig != embed {
    79  		t.Fatalf("%s (%p) != %s (%p)", orig, orig, embed, embed)
    80  	}
    81  }
    82  
    83  var testObjects = []struct {
    84  	src  string
    85  	obj  string
    86  	want string
    87  }{
    88  	{"import \"io\"; var r io.Reader", "r", "var p.r io.Reader"},
    89  
    90  	{"const c = 1.2", "c", "const p.c untyped float"},
    91  	{"const c float64 = 3.14", "c", "const p.c float64"},
    92  
    93  	{"type t struct{f int}", "t", "type p.t struct{f int}"},
    94  	{"type t func(int)", "t", "type p.t func(int)"},
    95  	{"type t[P any] struct{f P}", "t", "type p.t[P any] struct{f P}"},
    96  	{"type t[P any] struct{f P}", "t.P", "type parameter P any"},
    97  	{"type C interface{m()}; type t[P C] struct{}", "t.P", "type parameter P p.C"},
    98  
    99  	{"type t = struct{f int}", "t", "type p.t = struct{f int}"},
   100  	{"type t = func(int)", "t", "type p.t = func(int)"},
   101  
   102  	{"var v int", "v", "var p.v int"},
   103  
   104  	{"func f(int) string", "f", "func p.f(int) string"},
   105  	{"func g[P any](x P){}", "g", "func p.g[P any](x P)"},
   106  	{"func g[P interface{~int}](x P){}", "g.P", "type parameter P interface{~int}"},
   107  	{"", "any", "type any = interface{}"},
   108  }
   109  
   110  func TestObjectString(t *testing.T) {
   111  	testenv.MustHaveGoBuild(t)
   112  
   113  	for _, test := range testObjects {
   114  		src := "package p; " + test.src
   115  		pkg, err := typecheck(src, nil, nil)
   116  		if err != nil {
   117  			t.Errorf("%s: %s", src, err)
   118  			continue
   119  		}
   120  
   121  		names := strings.Split(test.obj, ".")
   122  		if len(names) != 1 && len(names) != 2 {
   123  			t.Errorf("%s: invalid object path %s", test.src, test.obj)
   124  			continue
   125  		}
   126  		_, obj := pkg.Scope().LookupParent(names[0], nopos)
   127  		if obj == nil {
   128  			t.Errorf("%s: %s not found", test.src, names[0])
   129  			continue
   130  		}
   131  		if len(names) == 2 {
   132  			if typ, ok := obj.Type().(interface{ TypeParams() *TypeParamList }); ok {
   133  				obj = lookupTypeParamObj(typ.TypeParams(), names[1])
   134  				if obj == nil {
   135  					t.Errorf("%s: %s not found", test.src, test.obj)
   136  					continue
   137  				}
   138  			} else {
   139  				t.Errorf("%s: %s has no type parameters", test.src, names[0])
   140  				continue
   141  			}
   142  		}
   143  
   144  		if got := obj.String(); got != test.want {
   145  			t.Errorf("%s: got %s, want %s", test.src, got, test.want)
   146  		}
   147  	}
   148  }
   149  
   150  func lookupTypeParamObj(list *TypeParamList, name string) Object {
   151  	for i := 0; i < list.Len(); i++ {
   152  		tpar := list.At(i)
   153  		if tpar.Obj().Name() == name {
   154  			return tpar.Obj()
   155  		}
   156  	}
   157  	return nil
   158  }
   159
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