Implement JsMethodMirror.parameters.

dart/tests/lib/mirrors/stringify.dart

+// Copyright (c) 2013, 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.
+
+/// Helper methods for converting a [Mirror] to a [String].
+library test.stringify;
+
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+
+name(DeclarationMirror mirror) {
+  return (mirror == null) ? '<null>' : stringify(mirror.simpleName);
+}
+
+stringifyMap(Map map) {
+  var buffer = new StringBuffer('{');

[kasperl, 2013/06/28 10:18:09]

Nit: Consider using an empty string buffer and end with:

   return "{$buffer}";

Same "trick" applies in multiple places in this file.

[ahe, 2013/06/28 11:07:12]

Done.

+  bool first = true;
+  for (String key in map.keys.map(MirrorSystem.getName).toList()..sort()) {
+    if (!first) buffer.write(', ');
+    first = false;
+    buffer.write(key);
+    buffer.write(': ');
+    buffer.write(stringify(map[new Symbol(key)]));
+  }
+  return (buffer..write('}')).toString();
+}
+
+stringifyList(List list) {
+  var buffer = new StringBuffer('[');
+  bool first = true;
+  for (String value in list.map(stringify)) {
+    if (!first) buffer.write(', ');
+    first = false;
+    buffer.write(value);
+  }
+  return (buffer..write(']')).toString();
+}
+
+stringifySymbol(Symbol symbol) => 's(${MirrorSystem.getName(symbol)})';
+
+writeDeclarationOn(DeclarationMirror mirror, StringBuffer buffer) {
+  buffer.write(stringify(mirror.simpleName));
+  if (mirror.owner != null) {
+    buffer.write(' in ');
+    buffer.write(name(mirror.owner));
+  }
+  if (mirror.isPrivate) buffer.write(', private');
+  if (mirror.isTopLevel) buffer.write(', top-level');
+}
+
+writeVariableOn(VariableMirror variable, StringBuffer buffer) {
+  writeDeclarationOn(variable, buffer);
+  if (variable.isStatic) buffer.write(', static');
+  if (variable.isFinal) buffer.write(', final');
+}
+
+stringifyVariable(VariableMirror variable) {
+  var buffer = new StringBuffer('Variable(');
+  writeVariableOn(variable, buffer);
+  return (buffer..write(')')).toString();
+}
+
+stringifyParameter(ParameterMirror parameter) {
+  var buffer = new StringBuffer('Parameter(');
+  writeVariableOn(parameter, buffer);
+  if (parameter.isOptional) buffer.write(', optional');
+  if (parameter.isNamed) buffer.write(', named');
+  if (parameter.hasDefaultValue) {
+    buffer.write(', value = ${stringify(parameter.defaultValue)}');
+  }
+  // TODO(ahe): Move to writeVariableOn.
+  buffer.write(', type = ${stringifyType(parameter.type)}');
+  return (buffer..write(')')).toString();
+}
+
+stringifyType(TypeMirror type) {
+  var buffer = new StringBuffer('Type(');
+  writeDeclarationOn(type, buffer);
+  return (buffer..write(')')).toString();
+}
+
+stringifyMethod(MethodMirror method) {
+  var buffer = new StringBuffer('Method(');
+  writeDeclarationOn(method, buffer);
+  if (method.isStatic) buffer.write(', static');
+  if (method.isGetter) buffer.write(', getter');
+  if (method.isSetter) buffer.write(', setter');
+  if (method.isConstructor) buffer.write(', constructor');
+  return (buffer..write(')')).toString();
+}
+
+stringify(value) {
+  if (value is Map) return stringifyMap(value);
+  if (value is List) return stringifyList(value);
+  if (value is ParameterMirror) return stringifyParameter(value);
+  if (value is VariableMirror) return stringifyVariable(value);
+  if (value is MethodMirror) return stringifyMethod(value);
+  if (value is Symbol) return stringifySymbol(value);
+  if (value is TypeMirror) return stringifyType(value);
+  if (value == null) return '<null>';
+  throw 'Unexpected value: $value';
+}
+
+expect(expected, actual) => Expect.stringEquals(expected, stringify(actual));