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tool/input_sdk/private/classes.dart

Index: tool/input_sdk/private/classes.dart
diff --git a/tool/input_sdk/private/classes.dart b/tool/input_sdk/private/classes.dart
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+// Copyright (c) 2015, 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.
+
+/// This library defines the operations that define and manipulate Dart
+/// classes.  Included in this are:
+///   - Generics
+///   - Class metadata
+///   - Extension methods
+///
+
+// TODO(leafp): Consider splitting some of this out.
+library dart._classes;
+
+import 'dart:_foreign_helper' show JS, JsName, rest, genericTypeConstructor;
+
+import 'dart:_interceptors' show JSArray;
+import 'dart:_types' show definiteFunctionType, dynamicR;
+import 'dart:_rtti' show tag, tagMemoized;
+import 'dart:_utils' as utils;
+
+@JsName('assert')
+final assert_ = JS('', '${utils.assert_}');
+final copyProperties = JS('', '${utils.copyProperties}');
+final copyTheseProperties = JS('', '${utils.copyTheseProperties}');
+final defineMemoizedGetter = JS('', '${utils.defineMemoizedGetter}');
+final safeGetOwnProperty = JS('', '${utils.safeGetOwnProperty}');
+final throwInternalError = JS('', '${utils.throwInternalError}');
+
+final defineProperty = JS('', 'Object.defineProperty');
+final getOwnPropertyDescriptor = JS('', 'Object.getOwnPropertyDescriptor');
+final getOwnPropertySymbols = JS('', 'Object.getOwnPropertySymbols');
+
+/// The Symbol for storing type arguments on a specialized generic type.
+final _mixins = JS('', 'Symbol("mixins")');
+@JsName('implements')
+final implements_ = JS('', 'Symbol("implements")');
+final metadata = JS('', 'Symbol("metadata")');
+
+///
+/// Returns a new type that mixes members from base and all mixins.
+///
+/// Each mixin applies in sequence, with further to the right ones overriding
+/// previous entries.
+///
+/// For each mixin, we only take its own properties, not anything from its
+/// superclass (prototype).
+///
+mixin(base, @rest mixins) => JS('', '''(() => {
+  // Create an initializer for the mixin, so when derived constructor calls
+  // super, we can correctly initialize base and mixins.
+
+  // Create a class that will hold all of the mixin methods.
+  class Mixin extends $base {
+    // Initializer method: run mixin initializers, then the base.
+    [$base.name](...args) {
+      // Run mixin initializers. They cannot have arguments.
+      // Run them backwards so most-derived mixin is initialized first.
+      for (let i = $mixins.length - 1; i >= 0; i--) {
+        let mixin = $mixins[i];
+        let init = mixin.prototype[mixin.name];
+        if (init) init.call(this);
+      }
+      // Run base initializer.
+      let init = $base.prototype[base.name];
+      if (init) init.apply(this, args);
+    }
+  }
+  // Copy each mixin's methods, with later ones overwriting earlier entries.
+  for (let m of $mixins) {
+    $copyProperties(Mixin.prototype, m.prototype);
+  }
+
+  // Set the signature of the Mixin class to be the composition
+  // of the signatures of the mixins.
+  $setSignature(Mixin, {
+    methods: () => {
+      let s = {};
+      for (let m of $mixins) {
+        $copyProperties(s, m[$_methodSig]);
+      }
+      return s;
+    }
+  });
+
+  // Save mixins for reflection
+  Mixin[$_mixins] = $mixins;
+  return Mixin;
+})()''');
+
+getMixins(clazz) => JS('', '''(() => {
+  return $clazz[$_mixins];
+})()''');
+
+getImplements(clazz) => JS('', '''(() => {
+  return $clazz[$implements_];
+})()''');
+
+/// The Symbol for storing type arguments on a specialized generic type.
+final _typeArguments = JS('', 'Symbol("typeArguments")');
+final _originalDeclaration = JS('', 'Symbol("originalDeclaration")');
+
+/// Memoize a generic type constructor function.
+generic(typeConstructor) => JS('', '''(() => {
+  let length = $typeConstructor.length;
+  if (length < 1) {
+    $throwInternalError('must have at least one generic type argument');
+  }
+  let resultMap = new Map();
+  function makeGenericType(...args) {
+    if (args.length != length && args.length != 0) {
+      $throwInternalError('requires ' + length + ' or 0 type arguments');
+    }
+    while (args.length < length) args.push($dynamicR);
+
+    let value = resultMap;
+    for (let i = 0; i < length; i++) {
+      let arg = args[i];
+      if (arg == null) {
+        $throwInternalError('type arguments should not be null: '
+                          + $typeConstructor);
+      }
+      let map = value;
+      value = map.get(arg);
+      if (value === void 0) {
+        if (i + 1 == length) {
+          value = $typeConstructor.apply(null, args);
+          // Save the type constructor and arguments for reflection.
+          if (value) {
+            value[$_typeArguments] = args;
+            value[$_originalDeclaration] = makeGenericType;
+          }
+        } else {
+          value = new Map();
+        }
+        map.set(arg, value);
+      }
+    }
+    return value;
+  }
+  return makeGenericType;
+})()''');
+
+getGenericClass(type) => JS('', '''(() => {
+  return $safeGetOwnProperty($type, $_originalDeclaration);
+})()''');
+
+getGenericArgs(type) => JS('', '''(() => {
+  return $safeGetOwnProperty($type, $_typeArguments);
+})()''');
+
+final _constructorSig = JS('', 'Symbol("sigCtor")');
+final _methodSig = JS('', 'Symbol("sig")');
+final _staticSig = JS('', 'Symbol("sigStatic")');
+
+/// Get the type of a method using the stored signature
+getMethodType(obj, name) => JS('', '''(() => {
+  if ($obj === void 0) return void 0;
+  if ($obj == null) return void 0;
+  let sigObj = $obj.__proto__.constructor[$_methodSig];
+  if (sigObj === void 0) return void 0;
+  let parts = sigObj[$name];
+  if (parts === void 0) return void 0;
+  return $definiteFunctionType.apply(null, parts);
+})()''');
+
+/// Get the type of a constructor from a class using the stored signature
+/// If name is undefined, returns the type of the default constructor
+/// Returns undefined if the constructor is not found.
+classGetConstructorType(cls, name) => JS('', '''(() => {
+  if(!$name) $name = $cls.name;
+  if ($cls === void 0) return void 0;
+  if ($cls == null) return void 0;
+  let sigCtor = $cls[$_constructorSig];
+  if (sigCtor === void 0) return void 0;
+  let parts = sigCtor[$name];
+  if (parts === void 0) return void 0;
+  return $definiteFunctionType.apply(null, parts);
+})()''');
+
+/// Given an object and a method name, tear off the method.
+/// Sets the runtime type of the torn off method appropriately,
+/// and also binds the object.
+///
+/// If the optional `f` argument is passed in, it will be used as the method.
+/// This supports cases like `super.foo` where we need to tear off the method
+/// from the superclass, not from the `obj` directly.
+/// TODO(leafp): Consider caching the tearoff on the object?
+bind(obj, name, f) => JS('', '''(() => {
+  if ($f === void 0) $f = $obj[$name];
+  $f = $f.bind($obj);
+  // TODO(jmesserly): track the function's signature on the function, instead
+  // of having to go back to the class?
+  let sig = $getMethodType($obj, $name);
+  $assert_(sig);
+  $tag($f, sig);
+  return $f;
+})()''');
+
+// Set up the method signature field on the constructor
+_setMethodSignature(f, sigF) => JS('', '''(() => {
+  $defineMemoizedGetter($f, $_methodSig, () => {
+    let sigObj = $sigF();
+    sigObj.__proto__ = $f.__proto__[$_methodSig];
+    return sigObj;
+  });
+})()''');
+
+// Set up the constructor signature field on the constructor
+_setConstructorSignature(f, sigF) => JS('', '''(() => {
+  $defineMemoizedGetter($f, $_constructorSig, $sigF);
+})()''');
+
+// Set up the static signature field on the constructor
+_setStaticSignature(f, sigF) => JS('', '''(() => {
+  $defineMemoizedGetter($f, $_staticSig, $sigF);
+})()''');
+
+// Set the lazily computed runtime type field on static methods
+_setStaticTypes(f, names) => JS('', '''(() => {
+  for (let name of $names) {
+    $tagMemoized($f[name], function() {
+      let parts = $f[$_staticSig][name];
+      return $definiteFunctionType.apply(null, parts);
+    })
+  }
+})()''');
+
+/// Set up the type signature of a class (constructor object)
+/// f is a constructor object
+/// signature is an object containing optional properties as follows:
+///  methods: A function returning an object mapping method names
+///   to method types.  The function is evaluated lazily and cached.
+///  statics: A function returning an object mapping static method
+///   names to types.  The function is evalutated lazily and cached.
+///  names: An array of the names of the static methods.  Used to
+///   permit eagerly setting the runtimeType field on the methods
+///   while still lazily computing the type descriptor object.
+setSignature(f, signature) => JS('', '''(() => {
+  // TODO(ochafik): Deconstruct these when supported by Chrome.
+  let constructors =
+    ('constructors' in signature) ? signature.constructors : () => ({});
+  let methods =
+    ('methods' in signature) ? signature.methods : () => ({});
+  let statics =
+    ('statics' in signature) ? signature.statics : () => ({});
+  let names =
+    ('names' in signature) ? signature.names : [];
+  $_setConstructorSignature($f, constructors);
+  $_setMethodSignature($f, methods);
+  $_setStaticSignature($f, statics);
+  $_setStaticTypes($f, names);
+  $tagMemoized($f, () => $Type);
+})()''');
+
+hasMethod(obj, name) => JS('', '''(() => {
+  return $getMethodType($obj, $name) !== void 0;
+})()''');
+
+///
+/// This is called whenever a derived class needs to introduce a new field,
+/// shadowing a field or getter/setter pair on its parent.
+///
+/// This is important because otherwise, trying to read or write the field
+/// would end up calling the getter or setter, and one of those might not even
+/// exist, resulting in a runtime error. Even if they did exist, that's the
+/// wrong behavior if a new field was declared.
+///
+virtualField(subclass, fieldName) => JS('', '''(() => {
+  // If the field is already overridden, do nothing.
+  let prop = $getOwnPropertyDescriptor($subclass.prototype, $fieldName);
+  if (prop) return;
+
+  let symbol = Symbol($subclass.name + '.' + $fieldName);
+  $defineProperty($subclass.prototype, $fieldName, {
+    get: function() { return this[symbol]; },
+    set: function(x) { this[symbol] = x; }
+  });
+})()''');
+
+///
+/// Given a class and an initializer method name, creates a constructor
+/// function with the same name. For example `new SomeClass.name(args)`.
+///
+defineNamedConstructor(clazz, name) => JS('', '''(() => {
+  let proto = $clazz.prototype;
+  let initMethod = proto[$name];
+  let ctor = function() { return initMethod.apply(this, arguments); };
+  ctor.prototype = proto;
+  // Use defineProperty so we don't hit a property defined on Function,
+  // like `caller` and `arguments`.
+  $defineProperty($clazz, $name, { value: ctor, configurable: true });
+})()''');
+
+final _extensionType = JS('', 'Symbol("extensionType")');
+
+final dartx = JS('', '{}');
+
+getExtensionSymbol(name) => JS('', '''(() => {
+  let sym = $dartx[$name];
+  if (!sym) $dartx[$name] = sym = Symbol('dartx.' + $name);
+  return sym;
+})()''');
+
+defineExtensionNames(names) => JS('', '''(() => {
+  $names.forEach($getExtensionSymbol);
+})()''');
+
+///
+/// Copy symbols from the prototype of the source to destination.
+/// These are the only properties safe to copy onto an existing public
+/// JavaScript class.
+///
+registerExtension(jsType, dartExtType) => JS('', '''(() => {
+  let extProto = $dartExtType.prototype;
+  let jsProto = $jsType.prototype;
+
+  // Mark the JS type's instances so we can easily check for extensions.
+  $assert_(jsProto[$_extensionType] === void 0);
+  jsProto[$_extensionType] = extProto;
+
+  let dartObjProto = $Object.prototype;
+  while (extProto !== dartObjProto && extProto !== jsProto) {
+    $copyTheseProperties(jsProto, extProto, $getOwnPropertySymbols(extProto));
+    extProto = extProto.__proto__;
+  }
+  let originalSigFn = $getOwnPropertyDescriptor($dartExtType, $_methodSig).get;
+  $assert_(originalSigFn);
+  $defineMemoizedGetter($jsType, $_methodSig, originalSigFn);
+})()''');
+
+///
+/// Mark a concrete type as implementing extension methods.
+/// For example: `class MyIter implements Iterable`.
+///
+/// This takes a list of names, which are the extension methods implemented.
+/// It will add a forwarder, so the extension method name redirects to the
+/// normal Dart method name. For example:
+///
+///     defineExtensionMembers(MyType, ['add', 'remove']);
+///
+/// Results in:
+///
+///     MyType.prototype[dartx.add] = MyType.prototype.add;
+///     MyType.prototype[dartx.remove] = MyType.prototype.remove;
+///
+// TODO(jmesserly): essentially this gives two names to the same method.
+// This benefit is roughly equivalent call performance either way, but the
+// cost is we need to call defineExtensionMembers any time a subclass
+// overrides one of these methods.
+defineExtensionMembers(type, methodNames) => JS('', '''(() => {
+  let proto = $type.prototype;
+  for (let name of $methodNames) {
+    let method = $getOwnPropertyDescriptor(proto, name);
+    $defineProperty(proto, $getExtensionSymbol(name), method);
+  }
+  // Ensure the signature is available too.
+  // TODO(jmesserly): not sure if we can do this in a cleaner way. Essentially
+  // we need to copy the signature (and in the future, other data like
+  // annotations) any time we copy a method as part of our metaprogramming.
+  // It might be more friendly to JS metaprogramming if we include this info
+  // on the function.
+  let originalSigFn = $getOwnPropertyDescriptor($type, $_methodSig).get;
+  $defineMemoizedGetter(type, $_methodSig, function() {
+    let sig = originalSigFn();
+    for (let name of $methodNames) {
+      sig[$getExtensionSymbol(name)] = sig[name];
+    }
+    return sig;
+  });
+})()''');
+
+canonicalMember(obj, name) => JS('', '''(() => {
+  if ($obj != null && $obj[$_extensionType]) return $dartx[$name];
+  // Check for certain names that we can't use in JS
+  if ($name == 'constructor' || $name == 'prototype') {
+    $name = '+' + $name;
+  }
+  return $name;
+})()''');
+
+/// Sets the type of `obj` to be `type`
+setType(obj, type) => JS('', '''(() => {
+  $obj.__proto__ = $type.prototype;
+  return $obj;
+})()''');
+
+/// Sets the element type of a list literal.
+list(obj, elementType) => JS('', '''(() => {
+  // TODO(ochafik): Expose a way to build imported generics.
+  return $setType($obj, ${genericTypeConstructor(JSArray)}($elementType));
+})()''');
+
+setBaseClass(derived, base) => JS('', '''(() => {
+  // Link the extension to the type it's extending as a base class.
+  $derived.prototype.__proto__ = $base.prototype;
+})()''');