Implements support for reflection on parameters.

test_reflectable/test/parameter_test.dart

+// Copyright (c) 2015, the Dart Team. All rights reserved. Use of this
+// source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+// File being transformed by the reflectable transformer.
+// Accesses method parameters and their properties, such as
+// existence, being optional, type annotations.
+
+library test_reflectable.test.parameter_test;
+
+import 'package:reflectable/reflectable.dart';
+import 'package:unittest/unittest.dart';
+
+class MyReflectable extends Reflectable {
+  const MyReflectable()
+      : super(typeCapability, invokingCapability, declarationsCapability);
+}
+
+const myReflectable = const MyReflectable();
+
+@myReflectable
+class MyClass {
+  int arg0() => null;
+  int arg1(int x) => null;
+  int arg2to4(MyClass x, int y, [MyReflectable z, w = 41.99999999]) => null;
+  int argNamed(int x, y, {num z}) => null;
+
+  int operator +(int x) => null;
+  int operator [](int x) => null;
+  void operator []=(int x, v) {}
+
+  static int noArguments() => null;
+  static int oneArgument(String x) => null;
+  static int optionalArguments(MyClass x, double y,
+          [MyReflectable z, dynamic w = 42]) =>
+      null;
+  static int namedArguments(String x, List y, {String z: "4" + "2"}) =>
+      null;
+}
+
+final throwsNoCapability = throwsA(const isInstanceOf<NoSuchCapabilityError>());
+
+main() {
+  ClassMirror myClassMirror = myReflectable.reflectType(MyClass);
+  Map<String, DeclarationMirror> declarations = myClassMirror.declarations;
+
+  MethodMirror arg0Mirror = declarations["arg0"];
+  MethodMirror arg1Mirror = declarations["arg1"];
+  MethodMirror arg2to4Mirror = declarations["arg2to4"];
+  MethodMirror argNamedMirror = declarations["argNamed"];
+  MethodMirror opPlusMirror = declarations["+"];
+  MethodMirror opBracketMirror = declarations["[]"];
+  MethodMirror opBracketEqualsMirror = declarations["[]="];
+  MethodMirror noArgumentsMirror = declarations["noArguments"];
+  MethodMirror oneArgumentMirror = declarations["oneArgument"];
+  MethodMirror optionalArgumentsMirror = declarations["optionalArguments"];
+  MethodMirror namedArgumentsMirror = declarations["namedArguments"];
+
+  test('parameter list properties, instance methods', () {
+    expect(arg0Mirror.parameters.length, 0);
+
+    expect(arg1Mirror.parameters.length, 1);
+    ParameterMirror arg1Parameter0 = arg1Mirror.parameters[0];
+    expect(arg1Parameter0.isOptional, false);
+    expect(arg1Parameter0.isNamed, false);
+    expect(arg1Parameter0.isStatic, false);
+    expect(arg1Parameter0.isConst, false);
+    expect(arg1Parameter0.isFinal, false);
+    expect(arg1Parameter0.isPrivate, false);
+    expect(arg1Parameter0.isTopLevel, false);
+
+    expect(arg2to4Mirror.parameters.length, 4);
+    ParameterMirror arg2to4Parameter0 = arg2to4Mirror.parameters[0];
+    ParameterMirror arg2to4Parameter1 = arg2to4Mirror.parameters[1];
+    ParameterMirror arg2to4Parameter2 = arg2to4Mirror.parameters[2];
+    ParameterMirror arg2to4Parameter3 = arg2to4Mirror.parameters[3];
+    expect(arg2to4Parameter0.isOptional, false);
+    expect(arg2to4Parameter0.type.reflectedType, MyClass);
+    expect(arg2to4Parameter1.isOptional, false);
+    expect(arg2to4Parameter1.type.reflectedType, int);
+    expect(arg2to4Parameter2.isOptional, true);
+    expect(arg2to4Parameter2.isNamed, false);
+    expect(arg2to4Parameter2.type.reflectedType, MyReflectable);
+    expect(arg2to4Parameter3.isOptional, true);
+    expect(arg2to4Parameter3.isNamed, false);
+    expect(arg2to4Parameter3.type.reflectedType, dynamic);
+    expect(arg2to4Parameter3.hasDefaultValue, true);
+    expect(arg2to4Parameter3.defaultValue, 41.99999999);
+
+    expect(argNamedMirror.parameters.length, 3);
+    ParameterMirror argNamedParameter0 = argNamedMirror.parameters[0];
+    ParameterMirror argNamedParameter1 = argNamedMirror.parameters[1];
+    ParameterMirror argNamedParameter2 = argNamedMirror.parameters[2];
+    expect(argNamedParameter0.isOptional, false);
+    expect(argNamedParameter0.type.reflectedType, int);
+    expect(argNamedParameter1.isOptional, false);
+    expect(argNamedParameter1.type.reflectedType, dynamic);
+    expect(argNamedParameter2.isOptional, true);
+    expect(argNamedParameter2.isNamed, true);
+    expect(argNamedParameter2.type.reflectedType, num);
+    expect(argNamedParameter2.hasDefaultValue, false);
+    expect(argNamedParameter2.defaultValue, null);
+  });
+
+  test('parameter list properties, operators', () {
+    expect(opPlusMirror.parameters.length, 1);
+    ParameterMirror opPlusParameter0 = opPlusMirror.parameters[0];
+    expect(opPlusParameter0.isOptional, false);
+    expect(opPlusParameter0.type.reflectedType, int);
+
+    expect(opBracketMirror.parameters.length, 1);
+    expect(opBracketMirror.parameters[0].isOptional, false);
+
+    expect(opBracketEqualsMirror.parameters.length, 2);
+    ParameterMirror opBracketEqualsParameter0 =
+        opBracketEqualsMirror.parameters[0];
+    ParameterMirror opBracketEqualsParameter1 =
+        opBracketEqualsMirror.parameters[1];
+    expect(opBracketEqualsParameter0.isOptional, false);
+    expect(opBracketEqualsParameter0.type.reflectedType, int);
+    expect(opBracketEqualsParameter1.isOptional, false);
+    expect(opBracketEqualsParameter1.type.reflectedType, dynamic);
+  });
+
+  test('parameter list properties, static methods', () {
+    expect(noArgumentsMirror.parameters.length, 0);
+
+    expect(oneArgumentMirror.parameters.length, 1);
+    expect(oneArgumentMirror.parameters[0].isOptional, false);
+
+    expect(optionalArgumentsMirror.parameters.length, 4);
+    ParameterMirror optionalArgumentsParameter0 =
+        optionalArgumentsMirror.parameters[0];
+    ParameterMirror optionalArgumentsParameter1 =
+        optionalArgumentsMirror.parameters[1];
+    ParameterMirror optionalArgumentsParameter2 =
+        optionalArgumentsMirror.parameters[2];
+    ParameterMirror optionalArgumentsParameter3 =
+        optionalArgumentsMirror.parameters[3];
+    expect(optionalArgumentsParameter0.isOptional, false);
+    expect(optionalArgumentsParameter0.type.reflectedType, MyClass);
+    expect(optionalArgumentsParameter1.isOptional, false);
+    expect(optionalArgumentsParameter1.type.reflectedType, double);
+    expect(optionalArgumentsParameter2.isOptional, true);
+    expect(optionalArgumentsParameter2.isNamed, false);
+    expect(optionalArgumentsParameter2.type.reflectedType, MyReflectable);
+    expect(optionalArgumentsParameter3.isOptional, true);
+    expect(optionalArgumentsParameter3.isNamed, false);
+    expect(optionalArgumentsParameter3.type.reflectedType, dynamic);
+    expect(optionalArgumentsParameter3.hasDefaultValue, true);
+    expect(optionalArgumentsParameter3.defaultValue, 42);
+
+    expect(namedArgumentsMirror.parameters.length, 3);
+    ParameterMirror namedArgumentsParameter0 =
+        namedArgumentsMirror.parameters[0];
+    ParameterMirror namedArgumentsParameter1 =
+        namedArgumentsMirror.parameters[1];
+    ParameterMirror namedArgumentsParameter2 =
+        namedArgumentsMirror.parameters[2];
+    expect(namedArgumentsParameter0.isOptional, false);
+    expect(namedArgumentsParameter0.type.reflectedType, String);
+    expect(namedArgumentsParameter1.isOptional, false);
+    expect(namedArgumentsParameter1.type.reflectedType, List);
+    expect(namedArgumentsParameter2.isOptional, true);
+    expect(namedArgumentsParameter2.isNamed, true);
+    expect(namedArgumentsParameter2.type.reflectedType, String);
+    expect(namedArgumentsParameter2.hasDefaultValue, true);
+    expect(namedArgumentsParameter2.defaultValue, "42");
+  });
+}