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// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// Tests resolution of identifiers inside of extension methods
// Test an extension MyExt with members whose names overlap with names from the
// global, and instance scopes:
// - a class A with only its own members
// - an extension ExtraExt which has only its own members
import "package:expect/expect.dart";
/////////////////////////////////////////////////////////////////////////
// Note: These imports may be deliberately unused. They bring certain
// names into scope, in order to test that certain resolution choices are
// made even in the presence of other symbols.
/////////////////////////////////////////////////////////////////////////
// Do Not Delete.
// Bring global members into scope.
import "helpers/global_scope.dart";
// Do Not Delete.
// Bring a class A with instance members into scope.
import "helpers/class_no_shadow.dart";
// Do Not Delete.
// Bring an extension ExtraExt with no overlapping symbols into scope.
import "helpers/extension_only.dart";
const bool extensionValue = true;
void checkExtensionValue(bool x) {
Expect.equals(x, extensionValue);
}
// An extension which defines all members
extension MyExt on A {
bool get fieldInGlobalScope => true;
bool get getterInGlobalScope => true;
set setterInGlobalScope(bool x) {
Expect.equals(true, x);
}
bool methodInGlobalScope() => true;
bool get fieldInInstanceScope => true;
bool get getterInInstanceScope => true;
set setterInInstanceScope(bool x) {
Expect.equals(true, x);
}
bool methodInInstanceScope() => true;
bool get fieldInExtensionScope => true;
bool get getterInExtensionScope => true;
set setterInExtensionScope(bool x) {
Expect.equals(true, x);
}
bool methodInExtensionScope() => true;
void testNakedIdentifiers() {
// Globals should resolve to local extension versions
{
bool t0 = fieldInGlobalScope;
checkExtensionValue(t0);
bool t1 = getterInGlobalScope;
checkExtensionValue(t1);
setterInGlobalScope = extensionValue;
bool t2 = methodInGlobalScope();
checkExtensionValue(t2);
}
// Un-prefixed instance members resolve to the local extension versions
{
bool t0 = fieldInInstanceScope;
checkExtensionValue(t0);
bool t1 = getterInInstanceScope;
checkExtensionValue(t0);
setterInInstanceScope = extensionValue;
bool t2 = methodInInstanceScope();
checkExtensionValue(t0);
}
// Extension members resolve to the extension methods in this extension
{
bool t0 = fieldInExtensionScope;
checkExtensionValue(t0);
bool t1 = getterInExtensionScope;
checkExtensionValue(t1);
setterInExtensionScope = extensionValue;
bool t2 = methodInExtensionScope();
checkExtensionValue(t2);
}
// Extension members not on this extension resolve to the extension methods
// in the other extension (unresolved identifier "id" gets turned into
// "this.id", which is then subject to extension method lookup).
{
double t0 = fieldInOtherExtensionScope;
checkOtherExtensionValue(t0);
double t1 = getterInOtherExtensionScope;
checkOtherExtensionValue(t1);
setterInOtherExtensionScope = otherExtensionValue;
double t2 = methodInOtherExtensionScope();
checkOtherExtensionValue(t2);
}
}
void testIdentifiersOnThis() {
// Globals should resolve to local extension versions
{
bool t0 = this.fieldInGlobalScope;
checkExtensionValue(t0);
bool t1 = this.getterInGlobalScope;
checkExtensionValue(t1);
this.setterInGlobalScope = extensionValue;
bool t2 = this.methodInGlobalScope();
checkExtensionValue(t2);
}
// Instance members resolve to the instance methods and not the members
// of the extension
{
String t0 = this.fieldInInstanceScope;
checkInstanceValue(t0);
String t1 = this.getterInInstanceScope;
checkInstanceValue(t0);
this.setterInInstanceScope = instanceValue;
String t2 = this.methodInInstanceScope();
checkInstanceValue(t0);
}
// Extension members resolve to the extension methods on this extension
{
bool t0 = this.fieldInExtensionScope;
checkExtensionValue(t0);
bool t1 = this.getterInExtensionScope;
checkExtensionValue(t1);
this.setterInExtensionScope = extensionValue;
bool t2 = this.methodInExtensionScope();
checkExtensionValue(t2);
}
// Extension members not on this extension resolve to the extension methods
// in the other extension.
{
double t0 = this.fieldInOtherExtensionScope;
checkOtherExtensionValue(t0);
double t1 = this.getterInOtherExtensionScope;
checkOtherExtensionValue(t1);
this.setterInOtherExtensionScope = otherExtensionValue;
double t2 = this.methodInOtherExtensionScope();
checkOtherExtensionValue(t2);
}
}
void testIdentifiersOnInstance() {
A self = this;
// Globals should resolve to local extension versions
{
bool t0 = self.fieldInGlobalScope;
checkExtensionValue(t0);
bool t1 = self.getterInGlobalScope;
checkExtensionValue(t1);
self.setterInGlobalScope = extensionValue;
bool t2 = self.methodInGlobalScope();
checkExtensionValue(t2);
}
// Instance members resolve to the instance methods and not the members
// of the extension
{
String t0 = self.fieldInInstanceScope;
checkInstanceValue(t0);
String t1 = self.getterInInstanceScope;
checkInstanceValue(t0);
self.setterInInstanceScope = instanceValue;
String t2 = self.methodInInstanceScope();
checkInstanceValue(t0);
}
// Extension members resolve to the extension methods on this extension
{
bool t0 = self.fieldInExtensionScope;
checkExtensionValue(t0);
bool t1 = self.getterInExtensionScope;
checkExtensionValue(t1);
self.setterInExtensionScope = extensionValue;
bool t2 = self.methodInExtensionScope();
checkExtensionValue(t2);
}
// Extension members not on this extension resolve to the extension methods
// in the other extension.
{
double t0 = self.fieldInOtherExtensionScope;
checkOtherExtensionValue(t0);
double t1 = self.getterInOtherExtensionScope;
checkOtherExtensionValue(t1);
self.setterInOtherExtensionScope = otherExtensionValue;
double t2 = self.methodInOtherExtensionScope();
checkOtherExtensionValue(t2);
}
}
void instanceTest() {
MyExt(this).testNakedIdentifiers();
MyExt(this).testIdentifiersOnThis();
MyExt(this).testIdentifiersOnInstance();
}
}
class B extends A {
void testNakedIdentifiers() {
// Globals should resolve to the global name space, and not to the members
// of the other extension (when present)
{
int t0 = fieldInGlobalScope;
checkGlobalValue(t0);
int t1 = getterInGlobalScope;
checkGlobalValue(t1);
setterInGlobalScope = globalValue;
int t2 = methodInGlobalScope();
checkGlobalValue(t2);
}
// Instance members resolve to the instance methods and not the members
// of the other extension (when present)
{
String t0 = fieldInInstanceScope;
checkInstanceValue(t0);
String t1 = getterInInstanceScope;
checkInstanceValue(t0);
setterInInstanceScope = instanceValue;
String t2 = methodInInstanceScope();
checkInstanceValue(t0);
}
// Extension members defined only in this extension resolve correctly.
{
bool t0 = fieldInExtensionScope;
checkExtensionValue(t0);
bool t1 = getterInExtensionScope;
checkExtensionValue(t1);
setterInExtensionScope = extensionValue;
bool t2 = methodInExtensionScope();
checkExtensionValue(t2);
}
// Extension members defined in the external extension resolve correctly
// (an unresolved identifier "id" gets turned into "this.id",
// which is then subject to extension method lookup).
{
double t0 = fieldInOtherExtensionScope;
checkOtherExtensionValue(t0);
double t1 = getterInOtherExtensionScope;
checkOtherExtensionValue(t1);
setterInOtherExtensionScope = otherExtensionValue;
double t2 = methodInOtherExtensionScope();
checkOtherExtensionValue(t2);
}
}
}
void main() {
var a = new A();
a.instanceTest();
new B().testNakedIdentifiers();
// Check external resolution as well while we're here
// Global symbols on an instance resolve to the version on this
// extension
{
bool t0 = a.fieldInGlobalScope;
checkExtensionValue(t0);
bool t1 = a.getterInGlobalScope;
checkExtensionValue(t1);
a.setterInGlobalScope = extensionValue;
bool t2 = a.methodInGlobalScope();
checkExtensionValue(t2);
}
// Instance members resolve to the instance methods and not the members
// of the other extension (when present)
{
String t0 = a.fieldInInstanceScope;
checkInstanceValue(t0);
String t1 = a.getterInInstanceScope;
checkInstanceValue(t1);
a.setterInInstanceScope = instanceValue;
String t2 = a.methodInInstanceScope();
checkInstanceValue(t2);
}
// Extension members resolve to the extension methods in this
// extension.
{
bool t0 = a.fieldInExtensionScope;
checkExtensionValue(t0);
bool t1 = a.getterInExtensionScope;
checkExtensionValue(t1);
a.setterInExtensionScope = extensionValue;
bool t2 = a.methodInExtensionScope();
checkExtensionValue(t2);
}
// Extension members resolve to the extension methods in the other
// extension.
{
double t0 = a.fieldInOtherExtensionScope;
checkOtherExtensionValue(t0);
double t1 = a.getterInOtherExtensionScope;
checkOtherExtensionValue(t1);
a.setterInOtherExtensionScope = otherExtensionValue;
double t2 = a.methodInOtherExtensionScope();
checkOtherExtensionValue(t2);
}
}