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// Copyright 2021 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 types_test
import (
"testing"
. "go/types"
)
func TestNewMethodSet(t *testing.T) {
type method struct {
name string
index []int
indirect bool
}
// Tests are expressed src -> methods, for simplifying the composite literal.
// Should be kept in sync with TestLookupFieldOrMethod.
tests := map[string][]method{
// Named types
"var a T; type T struct{}; func (T) f() {}": {{"f", []int{0}, false}},
"var a *T; type T struct{}; func (T) f() {}": {{"f", []int{0}, true}},
"var a T; type T struct{}; func (*T) f() {}": {},
"var a *T; type T struct{}; func (*T) f() {}": {{"f", []int{0}, true}},
// Interfaces
"var a T; type T interface{ f() }": {{"f", []int{0}, true}},
"var a T1; type ( T1 T2; T2 interface{ f() } )": {{"f", []int{0}, true}},
"var a T1; type ( T1 interface{ T2 }; T2 interface{ f() } )": {{"f", []int{0}, true}},
// Embedding
"var a struct{ E }; type E interface{ f() }": {{"f", []int{0, 0}, true}},
"var a *struct{ E }; type E interface{ f() }": {{"f", []int{0, 0}, true}},
"var a struct{ E }; type E struct{}; func (E) f() {}": {{"f", []int{0, 0}, false}},
"var a struct{ *E }; type E struct{}; func (E) f() {}": {{"f", []int{0, 0}, true}},
"var a struct{ E }; type E struct{}; func (*E) f() {}": {},
"var a struct{ *E }; type E struct{}; func (*E) f() {}": {{"f", []int{0, 0}, true}},
// collisions
"var a struct{ E1; *E2 }; type ( E1 interface{ f() }; E2 struct{ f int })": {},
"var a struct{ E1; *E2 }; type ( E1 struct{ f int }; E2 struct{} ); func (E2) f() {}": {},
}
genericTests := map[string][]method{
// By convention, look up a in the scope of "g"
"type C interface{ f() }; func g[T C](a T){}": {{"f", []int{0}, true}},
"type C interface{ f() }; func g[T C]() { var a T; _ = a }": {{"f", []int{0}, true}},
// Issue #43621: We don't allow this anymore. Keep this code in case we
// decide to revisit this decision.
// "type C interface{ f() }; func g[T C]() { var a struct{T}; _ = a }": {{"f", []int{0, 0}, true}},
// Issue #45639: We also don't allow this anymore.
// "type C interface{ f() }; func g[T C]() { type Y T; var a Y; _ = a }": {},
}
check := func(src string, methods []method, generic bool) {
pkgName := "p"
if generic {
// The generic_ prefix causes pkgFor to allow generic code.
pkgName = "generic_p"
}
pkg, err := pkgFor("test", "package "+pkgName+";"+src, nil)
if err != nil {
t.Errorf("%s: incorrect test case: %s", src, err)
return
}
scope := pkg.Scope()
if generic {
fn := pkg.Scope().Lookup("g").(*Func)
scope = fn.Scope()
}
obj := scope.Lookup("a")
if obj == nil {
t.Errorf("%s: incorrect test case - no object a", src)
return
}
ms := NewMethodSet(obj.Type())
if got, want := ms.Len(), len(methods); got != want {
t.Errorf("%s: got %d methods, want %d", src, got, want)
return
}
for i, m := range methods {
sel := ms.At(i)
if got, want := sel.Obj().Name(), m.name; got != want {
t.Errorf("%s [method %d]: got name = %q at, want %q", src, i, got, want)
}
if got, want := sel.Index(), m.index; !sameSlice(got, want) {
t.Errorf("%s [method %d]: got index = %v, want %v", src, i, got, want)
}
if got, want := sel.Indirect(), m.indirect; got != want {
t.Errorf("%s [method %d]: got indirect = %v, want %v", src, i, got, want)
}
}
}
for src, methods := range tests {
check(src, methods, false)
}
for src, methods := range genericTests {
check(src, methods, true)
}
}
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