The Tor Browser: dom/imptests/idlharness.js@6474c204b198 (annotated)

dom/imptests/idlharness.js@6474c204b198 (annotated)

dom/imptests/idlharness.js

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
 Distributed under both the W3C Test Suite License [1] and the W3C
 -clause BSD License [2]. To contribute to a W3C Test Suite, see the
 policies and contribution forms [3].
 [1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
 [2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
 [3] http://www.w3.org/2004/10/27-testcases
 */
 /*
  * This file automatically generates browser tests for WebIDL interfaces, using
  * the testharness.js framework.  To use, first include the following:
  *
  *   <script src=/resources/testharness.js></script>
  *   <script src=/resources/testharnessreport.js></script>
  *   <script src=/resources/WebIDLParser.js></script>
  *   <script src=/resources/idlharness.js></script>
  *
  * Then you'll need some type of IDLs.  Here's some script that can be run on a
  * spec written in HTML, which will grab all the elements with class="idl",
  * concatenate them, and replace the body so you can copy-paste:
  *
      var s = "";
      [].forEach.call(document.getElementsByClassName("idl"), function(idl) {
        //https://www.w3.org/Bugs/Public/show_bug.cgi?id=14914
        if (!idl.classList.contains("extract"))
        {
          s += idl.textContent + "\n\n";
        }
      });
      document.body.innerHTML = '<pre></pre>';
      document.body.firstChild.textContent = s;
  *
  * (TODO: write this in Python or something so that it can be done from the
  * command line instead.)
  *
  * Once you have that, put it in your script somehow.  The easiest way is to
  * embed it literally in an HTML file with <script type=text/plain> or similar,
  * so that you don't have to do any escaping.  Another possibility is to put it
  * in a separate .idl file that's fetched via XHR or similar.  Sample usage:
  *
  *   var idl_array = new IdlArray();
  *   idl_array.add_untested_idls("interface Node { readonly attribute DOMString nodeName; };");
  *   idl_array.add_idls("interface Document : Node { readonly attribute DOMString URL; };");
  *   idl_array.add_objects({Document: ["document"]});
  *   idl_array.test();
  *
  * This tests that window.Document exists and meets all the requirements of
  * WebIDL.  It also tests that window.document (the result of evaluating the
  * string "document") has URL and nodeName properties that behave as they
  * should, and otherwise meets WebIDL's requirements for an object whose
  * primary interface is Document.  It does not test that window.Node exists,
  * which is what you want if the Node interface is already tested in some other
  * specification's suite and your specification only extends or refers to it.
  * Of course, each IDL string can define many different things, and calls to
  * add_objects() can register many different objects for different interfaces:
  * this is a very simple example.
  *
  * TODO: Write assert_writable, assert_enumerable, assert_configurable and
  * their inverses, and use those instead of just checking
  * getOwnPropertyDescriptor.
  *
  * == Public methods of IdlArray ==
  *
  * IdlArray objects can be obtained with new IdlArray().  Anything not
  * documented in this section should be considered an implementation detail,
  * and outside callers should not use it.
  *
  * add_idls(idl_string):
  *   Parses idl_string (throwing on parse error) and adds the results to the
  *   IdlArray.  All the definitions will be tested when you run test().  If
  *   some of the definitions refer to other definitions, those must be present
  *   too.  For instance, if idl_string says that Document inherits from Node,
  *   the Node interface must also have been provided in some call to add_idls()
  *   or add_untested_idls().
  *
  * add_untested_idls(idl_string):
  *   Like add_idls(), but the definitions will not be tested.  If an untested
  *   interface is added and then extended with a tested partial interface, the
  *   members of the partial interface will still be tested.  Also, all the
  *   members will still be tested for objects added with add_objects(), because
  *   you probably want to test that (for instance) window.document has all the
  *   properties from Node, not just Document, even if the Node interface itself
  *   is tested in a different test suite.
  *
  * add_objects(dict):
  *   dict should be an object whose keys are the names of interfaces or
  *   exceptions, and whose values are arrays of strings.  When an interface or
  *   exception is tested, every string registered for it with add_objects()
  *   will be evaluated, and tests will be run on the result to verify that it
  *   correctly implements that interface or exception.  This is the only way to
  *   test anything about [NoInterfaceObject] interfaces, and there are many
  *   tests that can't be run on any interface without an object to fiddle with.
  *
  *   The interface has to be the *primary* interface of all the objects
  *   provided.  For example, don't pass {Node: ["document"]}, but rather
  *   {Document: ["document"]}.  Assuming the Document interface was declared to
  *   inherit from Node, this will automatically test that document implements
  *   the Node interface too.
  *
  *   Warning: methods will be called on any provided objects, in a manner that
  *   WebIDL requires be safe.  For instance, if a method has mandatory
  *   arguments, the test suite will try calling it with too few arguments to
  *   see if it throws an exception.  If an implementation incorrectly runs the
  *   function instead of throwing, this might have side effects, possibly even
  *   preventing the test suite from running correctly.
  *
  * prevent_multiple_testing(name):
  *   This is a niche method for use in case you're testing many objects that
  *   implement the same interfaces, and don't want to retest the same
  *   interfaces every single time.  For instance, HTML defines many interfaces
  *   that all inherit from HTMLElement, so the HTML test suite has something
  *   like
  *     .add_objects({
  *         HTMLHtmlElement: ['document.documentElement'],
  *         HTMLHeadElement: ['document.head'],
  *         HTMLBodyElement: ['document.body'],
  *         ...
  *     })
  *   and so on for dozens of element types.  This would mean that it would
  *   retest that each and every one of those elements implements HTMLElement,
  *   Element, and Node, which would be thousands of basically redundant tests.
  *   The test suite therefore calls prevent_multiple_testing("HTMLElement").
  *   This means that once one object has been tested to implement HTMLElement
  *   and its ancestors, no other object will be.  Thus in the example code
  *   above, the harness would test that document.documentElement correctly
  *   implements HTMLHtmlElement, HTMLElement, Element, and Node; but
  *   document.head would only be tested for HTMLHeadElement, and so on for
  *   further objects.
  *
  * test():
  *   Run all tests.  This should be called after you've called all other
  *   methods to add IDLs and objects.
  */
 /**
  * Notes for people who want to edit this file (not just use it as a library):
  *
  * Most of the interesting stuff happens in the derived classes of IdlObject,
  * especially IdlInterface.  The entry point for all IdlObjects is .test(),
  * which is called by IdlArray.test().  An IdlObject is conceptually just
  * "thing we want to run tests on", and an IdlArray is an array of IdlObjects
  * with some additional data thrown in.
  *
  * The object model is based on what WebIDLParser.js produces, which is in turn
  * based on its pegjs grammar.  If you want to figure out what properties an
  * object will have from WebIDLParser.js, the best way is to look at the
  * grammar:
  *
  *   https://github.com/darobin/webidl.js/blob/master/lib/grammar.peg
  *
  * So for instance:
  *
  *   // interface definition
  *   interface
  *       =   extAttrs:extendedAttributeList? S? "interface" S name:identifier w herit:ifInheritance? w "{" w mem:ifMember* w "}" w ";" w
  *           { return { type: "interface", name: name, inheritance: herit, members: mem, extAttrs: extAttrs }; }
  *
  * This means that an "interface" object will have a .type property equal to
  * the string "interface", a .name property equal to the identifier that the
  * parser found, an .inheritance property equal to either null or the result of
  * the "ifInheritance" production found elsewhere in the grammar, and so on.
  * After each grammatical production is a JavaScript function in curly braces
  * that gets called with suitable arguments and returns some JavaScript value.
  *
  * (Note that the version of WebIDLParser.js we use might sometimes be
  * out-of-date or forked.)
  *
  * The members and methods of the classes defined by this file are all at least
  * briefly documented, hopefully.
  */
 (function(){
 "use strict";
 /// Helpers ///
 function constValue (cnt) {
     if (cnt.type === "null") return null;
     if (cnt.type === "NaN") return NaN;
     if (cnt.type === "Infinity") return cnt.negative ? -Infinity : Infinity;
     return cnt.value;
 }
 /// IdlArray ///
 // Entry point
 window.IdlArray = function()
 //@{
 {
     /**
      * A map from strings to the corresponding named IdlObject, such as
      * IdlInterface or IdlException.  These are the things that test() will run
      * tests on.
      */
     this.members = {};
     /**
      * A map from strings to arrays of strings.  The keys are interface or
      * exception names, and are expected to also exist as keys in this.members
      * (otherwise they'll be ignored).  This is populated by add_objects() --
      * see documentation at the start of the file.  The actual tests will be
      * run by calling this.members[name].test_object(obj) for each obj in
      * this.objects[name].  obj is a string that will be eval'd to produce a
      * JavaScript value, which is supposed to be an object implementing the
      * given IdlObject (interface, exception, etc.).
      */
     this.objects = {};
     /**
      * When adding multiple collections of IDLs one at a time, an earlier one
      * might contain a partial interface or implements statement that depends
      * on a later one.  Save these up and handle them right before we run
      * tests.
      *
      * .partials is simply an array of objects from WebIDLParser.js'
      * "partialinterface" production.  .implements maps strings to arrays of
      * strings, such that
      *
      *   A implements B;
      *   A implements C;
      *   D implements E;
      *
      * results in { A: ["B", "C"], D: ["E"] }.
      */
     this.partials = [];
     this["implements"] = {};
 };
 //@}
 IdlArray.prototype.add_idls = function(raw_idls)
 //@{
 {
     /** Entry point.  See documentation at beginning of file. */
     this.internal_add_idls(WebIDL2.parse(raw_idls));
 };
 //@}
 IdlArray.prototype.add_untested_idls = function(raw_idls)
 //@{
 {
     /** Entry point.  See documentation at beginning of file. */
     var parsed_idls = WebIDL2.parse(raw_idls);
     for (var i = 0; i < parsed_idls.length; i++)
     {
         parsed_idls[i].untested = true;
         if ("members" in parsed_idls[i])
         {
             for (var j = 0; j < parsed_idls[i].members.length; j++)
             {
                 parsed_idls[i].members[j].untested = true;
             }
         }
     }
     this.internal_add_idls(parsed_idls);
 };
 //@}
 IdlArray.prototype.internal_add_idls = function(parsed_idls)
 //@{
 {
     /**
      * Internal helper called by add_idls() and add_untested_idls().
      * parsed_idls is an array of objects that come from WebIDLParser.js's
      * "definitions" production.  The add_untested_idls() entry point
      * additionally sets an .untested property on each object (and its
      * .members) so that they'll be skipped by test() -- they'll only be
      * used for base interfaces of tested interfaces, return types, etc.
      */
     parsed_idls.forEach(function(parsed_idl)
     {
         if (parsed_idl.type == "interface" && parsed_idl.partial)
         {
             this.partials.push(parsed_idl);
             return;
         }
         if (parsed_idl.type == "implements")
         {
             if (!(parsed_idl.target in this["implements"]))
             {
                 this["implements"][parsed_idl.target] = [];
             }
             this["implements"][parsed_idl.target].push(parsed_idl["implements"]);
             return;
         }
         parsed_idl.array = this;
         if (parsed_idl.name in this.members)
         {
             throw "Duplicate identifier " + parsed_idl.name;
         }
         switch(parsed_idl.type)
         {
         case "interface":
             this.members[parsed_idl.name] = new IdlInterface(parsed_idl);
             break;
         case "exception":
             this.members[parsed_idl.name] = new IdlException(parsed_idl);
             break;
         case "dictionary":
             // Nothing to test, but we need the dictionary info around for type
             // checks
             this.members[parsed_idl.name] = new IdlDictionary(parsed_idl);
             break;
         case "typedef":
             this.members[parsed_idl.name] = new IdlTypedef(parsed_idl);
             break;
         case "callback":
             // TODO
             console.log("callback not yet supported");
             break;
         case "enum":
             this.members[parsed_idl.name] = new IdlEnum(parsed_idl);
             break;
         case "callback interface":
             // TODO
             console.log("callback interface not yet supported");
             break;
         default:
             throw parsed_idl.name + ": " + parsed_idl.type + " not yet supported";
         }
     }.bind(this));
 };
 //@}
 IdlArray.prototype.add_objects = function(dict)
 //@{
 {
     /** Entry point.  See documentation at beginning of file. */
     for (var k in dict)
     {
         if (k in this.objects)
         {
             this.objects[k] = this.objects[k].concat(dict[k]);
         }
         else
         {
             this.objects[k] = dict[k];
         }
     }
 };
 //@}
 IdlArray.prototype.prevent_multiple_testing = function(name)
 //@{
 {
     /** Entry point.  See documentation at beginning of file. */
     this.members[name].prevent_multiple_testing = true;
 };
 //@}
 IdlArray.prototype.recursively_get_implements = function(interface_name)
 //@{
 {
     /**
      * Helper function for test().  Returns an array of things that implement
      * interface_name, so if the IDL contains
      *
      *   A implements B;
      *   B implements C;
      *   B implements D;
      *
      * then recursively_get_implements("A") should return ["B", "C", "D"].
      */
     var ret = this["implements"][interface_name];
     if (ret === undefined)
     {
         return [];
     }
     for (var i = 0; i < this["implements"][interface_name].length; i++)
     {
         ret = ret.concat(this.recursively_get_implements(ret[i]));
         if (ret.indexOf(ret[i]) != ret.lastIndexOf(ret[i]))
         {
             throw "Circular implements statements involving " + ret[i];
         }
     }
     return ret;
 };
 //@}
 IdlArray.prototype.test = function()
 //@{
 {
     /** Entry point.  See documentation at beginning of file. */
     // First merge in all the partial interfaces and implements statements we
     // encountered.
     this.partials.forEach(function(parsed_idl)
     {
         if (!(parsed_idl.name in this.members)
         || !(this.members[parsed_idl.name] instanceof IdlInterface))
         {
             throw "Partial interface " + parsed_idl.name + " with no original interface";
         }
         if (parsed_idl.extAttrs)
         {
             parsed_idl.extAttrs.forEach(function(extAttr)
             {
                 this.members[parsed_idl.name].extAttrs.push(extAttr);
             }.bind(this));
         }
         parsed_idl.members.forEach(function(member)
         {
             this.members[parsed_idl.name].members.push(new IdlInterfaceMember(member));
         }.bind(this));
     }.bind(this));
     this.partials = [];
     for (var lhs in this["implements"])
     {
         this.recursively_get_implements(lhs).forEach(function(rhs)
         {
             var errStr = lhs + " implements " + rhs + ", but ";
             if (!(lhs in this.members)) throw errStr + lhs + " is undefined.";
             if (!(this.members[lhs] instanceof IdlInterface)) throw errStr + lhs + " is not an interface.";
             if (!(rhs in this.members)) throw errStr + rhs + " is undefined.";
             if (!(this.members[rhs] instanceof IdlInterface)) throw errStr + rhs + " is not an interface.";
             this.members[rhs].members.forEach(function(member)
             {
                 this.members[lhs].members.push(new IdlInterfaceMember(member));
             }.bind(this));
         }.bind(this));
     }
     this["implements"] = {};
     // Now run test() on every member, and test_object() for every object.
     for (var name in this.members)
     {
         this.members[name].test();
         if (name in this.objects)
         {
             this.objects[name].forEach(function(str)
             {
                 this.members[name].test_object(str);
             }.bind(this));
         }
     }
 };
 //@}
 IdlArray.prototype.assert_type_is = function(value, type)
 //@{
 {
     /**
      * Helper function that tests that value is an instance of type according
      * to the rules of WebIDL.  value is any JavaScript value, and type is an
      * object produced by WebIDLParser.js' "type" production.  That production
      * is fairly elaborate due to the complexity of WebIDL's types, so it's
      * best to look at the grammar to figure out what properties it might have.
      */
     if (type.idlType == "any")
     {
         // No assertions to make
         return;
     }
     if (type.nullable && value === null)
     {
         // This is fine
         return;
     }
     if (type.array)
     {
         // TODO: not supported yet
         return;
     }
     if (type.sequence)
     {
         assert_true(Array.isArray(value), "is not array");
         if (!value.length)
         {
             // Nothing we can do.
             return;
         }
         this.assert_type_is(value[0], type.idlType.idlType);
         return;
     }
     type = type.idlType;
     switch(type)
     {
         case "void":
             assert_equals(value, undefined);
             return;
         case "boolean":
             assert_equals(typeof value, "boolean");
             return;
         case "byte":
             assert_equals(typeof value, "number");
             assert_equals(value, Math.floor(value), "not an integer");
             assert_true(-128 <= value && value <= 127, "byte " + value + " not in range [-128, 127]");
             return;
         case "octet":
             assert_equals(typeof value, "number");
             assert_equals(value, Math.floor(value), "not an integer");
             assert_true(0 <= value && value <= 255, "octet " + value + " not in range [0, 255]");
             return;
         case "short":
             assert_equals(typeof value, "number");
             assert_equals(value, Math.floor(value), "not an integer");
             assert_true(-32768 <= value && value <= 32767, "short " + value + " not in range [-32768, 32767]");
             return;
         case "unsigned short":
             assert_equals(typeof value, "number");
             assert_equals(value, Math.floor(value), "not an integer");
             assert_true(0 <= value && value <= 65535, "unsigned short " + value + " not in range [0, 65535]");
             return;
         case "long":
             assert_equals(typeof value, "number");
             assert_equals(value, Math.floor(value), "not an integer");
             assert_true(-2147483648 <= value && value <= 2147483647, "long " + value + " not in range [-2147483648, 2147483647]");
             return;
         case "unsigned long":
             assert_equals(typeof value, "number");
             assert_equals(value, Math.floor(value), "not an integer");
             assert_true(0 <= value && value <= 4294967295, "unsigned long " + value + " not in range [0, 4294967295]");
             return;
         case "long long":
             assert_equals(typeof value, "number");
             return;
         case "unsigned long long":
             assert_equals(typeof value, "number");
             assert_true(0 <= value, "unsigned long long is negative");
             return;
         case "float":
         case "double":
         case "unrestricted float":
         case "unrestricted double":
             // TODO: distinguish these cases
             assert_equals(typeof value, "number");
             return;
         case "DOMString":
             assert_equals(typeof value, "string");
             return;
         case "object":
             assert_true(typeof value == "object" || typeof value == "function", "wrong type: not object or function");
             return;
     }
     if (!(type in this.members))
     {
         throw "Unrecognized type " + type;
     }
     if (this.members[type] instanceof IdlInterface)
     {
         // We don't want to run the full
         // IdlInterface.prototype.test_instance_of, because that could result
         // in an infinite loop.  TODO: This means we don't have tests for
         // NoInterfaceObject interfaces, and we also can't test objects that
         // come from another window.
         assert_true(typeof value == "object" || typeof value == "function", "wrong type: not object or function");
         if (value instanceof Object
         && !this.members[type].has_extended_attribute("NoInterfaceObject")
         && type in window)
         {
             assert_true(value instanceof window[type], "not instanceof " + type);
         }
     }
     else if (this.members[type] instanceof IdlEnum)
     {
         assert_equals(typeof value, "string");
     }
     else if (this.members[type] instanceof IdlDictionary)
     {
         // TODO: Test when we actually have something to test this on
     }
     else if (this.members[type] instanceof IdlTypedef)
     {
         // TODO: Test when we actually have something to test this on
     }
     else
     {
         throw "Type " + type + " isn't an interface or dictionary";
     }
 };
 //@}
 /// IdlObject ///
 function IdlObject() {}
 IdlObject.prototype.test = function()
 //@{
 {
     /**
      * By default, this does nothing, so no actual tests are run for IdlObjects
      * that don't define any (e.g., IdlDictionary at the time of this writing).
      */
 };
 //@}
 IdlObject.prototype.has_extended_attribute = function(name)
 //@{
 {
     /**
      * This is only meaningful for things that support extended attributes,
      * such as interfaces, exceptions, and members.
      */
     return this.extAttrs.some(function(o)
     {
         return o.name == name;
     });
 };
 //@}
 /// IdlDictionary ///
 // Used for IdlArray.prototype.assert_type_is
 function IdlDictionary(obj)
 //@{
 {
     /**
      * obj is an object produced by the WebIDLParser.js "dictionary"
      * production.
      */
     /** Self-explanatory. */
     this.name = obj.name;
     /** An array of objects produced by the "dictionaryMember" production. */
     this.members = obj.members;
     /**
      * The name (as a string) of the dictionary type we inherit from, or null
      * if there is none.
      */
     this.base = obj.inheritance;
 }
 //@}
 IdlDictionary.prototype = Object.create(IdlObject.prototype);
 /// IdlExceptionOrInterface ///
 // Code sharing!
 function IdlExceptionOrInterface(obj)
 //@{
 {
     /**
      * obj is an object produced by the WebIDLParser.js "exception" or
      * "interface" production, as appropriate.
      */
     /** Self-explanatory. */
     this.name = obj.name;
     /** A back-reference to our IdlArray. */
     this.array = obj.array;
     /**
      * An indicator of whether we should run tests on the (exception) interface
      * object and (exception) interface prototype object.  Tests on members are
      * controlled by .untested on each member, not this.
      */
     this.untested = obj.untested;
     /** An array of objects produced by the "ExtAttr" production. */
     this.extAttrs = obj.extAttrs;
     /** An array of IdlInterfaceMembers. */
     this.members = obj.members.map(function(m){return new IdlInterfaceMember(m); });
     /**
      * The name (as a string) of the type we inherit from, or null if there is
      * none.
      */
     this.base = obj.inheritance;
 }
 //@}
 IdlExceptionOrInterface.prototype = Object.create(IdlObject.prototype);
 IdlExceptionOrInterface.prototype.test = function()
 //@{
 {
     if (this.has_extended_attribute("NoInterfaceObject"))
     {
         // No tests to do without an instance.  TODO: We should still be able
         // to run tests on the prototype object, if we obtain one through some
         // other means.
         return;
     }
     if (!this.untested)
     {
         // First test things to do with the exception/interface object and
         // exception/interface prototype object.
         this.test_self();
     }
     // Then test things to do with its members (constants, fields, attributes,
     // operations, . . .).  These are run even if .untested is true, because
     // members might themselves be marked as .untested.  This might happen to
     // interfaces if the interface itself is untested but a partial interface
     // that extends it is tested -- then the interface itself and its initial
     // members will be marked as untested, but the members added by the partial
     // interface are still tested.
     this.test_members();
 };
 //@}
 /// IdlException ///
 function IdlException(obj) { IdlExceptionOrInterface.call(this, obj); }
 IdlException.prototype = Object.create(IdlExceptionOrInterface.prototype);
 IdlException.prototype.test_self = function()
 //@{
 {
     test(function()
     {
         // "For every exception that is not declared with the
         // [NoInterfaceObject] extended attribute, a corresponding property
         // must exist on the exception’s relevant namespace object. The name of
         // the property is the identifier of the exception, and its value is an
         // object called the exception interface object, which provides access
         // to any constants that have been associated with the exception. The
         // property has the attributes { [[Writable]]: true, [[Enumerable]]:
         // false, [[Configurable]]: true }."
         assert_own_property(window, this.name,
                             "window does not have own property " + format_value(this.name));
         var desc = Object.getOwnPropertyDescriptor(window, this.name);
         assert_false("get" in desc, "window's property " + format_value(this.name) + " has getter");
         assert_false("set" in desc, "window's property " + format_value(this.name) + " has setter");
         assert_true(desc.writable, "window's property " + format_value(this.name) + " is not writable");
         assert_false(desc.enumerable, "window's property " + format_value(this.name) + " is enumerable");
         assert_true(desc.configurable, "window's property " + format_value(this.name) + " is not configurable");
         // "The exception interface object for a given exception must be a
         // function object."
         // "If an object is defined to be a function object, then it has
         // characteristics as follows:"
         // "Its [[Prototype]] internal property is the Function prototype
         // object."
         // Note: This doesn't match browsers as of December 2011, see
         // http://www.w3.org/Bugs/Public/show_bug.cgi?id=14813
         assert_equals(Object.getPrototypeOf(window[this.name]), Function.prototype,
                       "prototype of window's property " + format_value(this.name) + " is not Function.prototype");
         // "Its [[Get]] internal property is set as described in ECMA-262
         // section 15.3.5.4."
         // Not much to test for this.
         // "Its [[Construct]] internal property is set as described in ECMA-262
         // section 13.2.2."
         // Tested below.
         // "Its [[HasInstance]] internal property is set as described in
         // ECMA-262 section 15.3.5.3, unless otherwise specified."
         // TODO
         // "Its [[Class]] internal property is “Function”."
         // String() returns something implementation-dependent, because it
         // calls Function#toString.
         assert_class_string(window[this.name], "Function",
                             "class string of " + this.name);
         // TODO: Test 4.9.1.1. Exception interface object [[Call]] method
         // (which does not match browsers:
         // http://www.w3.org/Bugs/Public/show_bug.cgi?id=14885)
     }.bind(this), this.name + " exception: existence and properties of exception interface object");
     test(function()
     {
         assert_own_property(window, this.name,
                             "window does not have own property " + format_value(this.name));
         // "The exception interface object must also have a property named
         // “prototype” with attributes { [[Writable]]: false, [[Enumerable]]:
         // false, [[Configurable]]: false } whose value is an object called the
         // exception interface prototype object. This object also provides
         // access to the constants that are declared on the exception."
         assert_own_property(window[this.name], "prototype",
                             'exception "' + this.name + '" does not have own property "prototype"');
         var desc = Object.getOwnPropertyDescriptor(window[this.name], "prototype");
         assert_false("get" in desc, this.name + ".prototype has getter");
         assert_false("set" in desc, this.name + ".prototype has setter");
         assert_false(desc.writable, this.name + ".prototype is writable");
         assert_false(desc.enumerable, this.name + ".prototype is enumerable");
         assert_false(desc.configurable, this.name + ".prototype is configurable");
         // "The exception interface prototype object for a given exception must
         // have an internal [[Prototype]] property whose value is as follows:
         //
         // "If the exception is declared to inherit from another exception,
         // then the value of the internal [[Prototype]] property is the
         // exception interface prototype object for the inherited exception.
         // "Otherwise, the exception is not declared to inherit from another
         // exception. The value of the internal [[Prototype]] property is the
         // Error prototype object ([ECMA-262], section 15.11.3.1)."
         //
         // Note: This doesn't match browsers as of December 2011, see
         // https://www.w3.org/Bugs/Public/show_bug.cgi?id=14887.
         var inherit_exception = this.base ? this.base : "Error";
         assert_own_property(window, inherit_exception,
                             'should inherit from ' + inherit_exception + ', but window has no such property');
         assert_own_property(window[inherit_exception], "prototype",
                             'should inherit from ' + inherit_exception + ', but that object has no "prototype" property');
         assert_equals(Object.getPrototypeOf(window[this.name].prototype),
                       window[inherit_exception].prototype,
                       'prototype of ' + this.name + '.prototype is not ' + inherit_exception + '.prototype');
         // "The class string of an exception interface prototype object is the
         // concatenation of the exception’s identifier and the string
         // “Prototype”."
         assert_class_string(window[this.name].prototype, this.name + "Prototype",
                             "class string of " + this.name + ".prototype");
         // TODO: Test String(), based on ES definition of
         // Error.prototype.toString?
     }.bind(this), this.name + " exception: existence and properties of exception interface prototype object");
     test(function()
     {
         assert_own_property(window, this.name,
                             "window does not have own property " + format_value(this.name));
         assert_own_property(window[this.name], "prototype",
                             'interface "' + this.name + '" does not have own property "prototype"');
         // "There must be a property named “name” on the exception interface
         // prototype object with attributes { [[Writable]]: true,
         // [[Enumerable]]: false, [[Configurable]]: true } and whose value is
         // the identifier of the exception."
         assert_own_property(window[this.name].prototype, "name",
                 'prototype object does not have own property "name"');
         var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, "name");
         assert_false("get" in desc, this.name + ".prototype.name has getter");
         assert_false("set" in desc, this.name + ".prototype.name has setter");
         assert_true(desc.writable, this.name + ".prototype.name is not writable");
         assert_false(desc.enumerable, this.name + ".prototype.name is enumerable");
         assert_true(desc.configurable, this.name + ".prototype.name is not configurable");
         assert_equals(desc.value, this.name, this.name + ".prototype.name has incorrect value");
     }.bind(this), this.name + " exception: existence and properties of exception interface prototype object's \"name\" property");
     test(function()
     {
         assert_own_property(window, this.name,
                             "window does not have own property " + format_value(this.name));
         assert_own_property(window[this.name], "prototype",
                             'interface "' + this.name + '" does not have own property "prototype"');
         // "If the [NoInterfaceObject] extended attribute was not specified on
         // the exception, then there must also be a property named
         // “constructor” on the exception interface prototype object with
         // attributes { [[Writable]]: true, [[Enumerable]]: false,
         // [[Configurable]]: true } and whose value is a reference to the
         // exception interface object for the exception."
         assert_own_property(window[this.name].prototype, "constructor",
                             this.name + '.prototype does not have own property "constructor"');
         var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, "constructor");
         assert_false("get" in desc, this.name + ".prototype.constructor has getter");
         assert_false("set" in desc, this.name + ".prototype.constructor has setter");
         assert_true(desc.writable, this.name + ".prototype.constructor is not writable");
         assert_false(desc.enumerable, this.name + ".prototype.constructor is enumerable");
         assert_true(desc.configurable, this.name + ".prototype.constructor in not configurable");
         assert_equals(window[this.name].prototype.constructor, window[this.name],
                       this.name + '.prototype.constructor is not the same object as ' + this.name);
     }.bind(this), this.name + " exception: existence and properties of exception interface prototype object's \"constructor\" property");
 };
 //@}
 IdlException.prototype.test_members = function()
 //@{
 {
     for (var i = 0; i < this.members.length; i++)
     {
         var member = this.members[i];
         if (member.untested)
         {
             continue;
         }
         if (member.type == "const" && member.name != "prototype")
         {
             test(function()
             {
                 assert_own_property(window, this.name,
                                     "window does not have own property " + format_value(this.name));
                 // "For each constant defined on the exception, there must be a
                 // corresponding property on the exception interface object, if
                 // it exists, if the identifier of the constant is not
                 // “prototype”."
                 assert_own_property(window[this.name], member.name);
                 // "The value of the property is the ECMAScript value that is
                 // equivalent to the constant’s IDL value, according to the
                 // rules in section 4.2 above."
                 assert_equals(window[this.name][member.name], constValue(member.value),
                               "property has wrong value");
                 // "The property has attributes { [[Writable]]: false,
                 // [[Enumerable]]: true, [[Configurable]]: false }."
                 var desc = Object.getOwnPropertyDescriptor(window[this.name], member.name);
                 assert_false("get" in desc, "property has getter");
                 assert_false("set" in desc, "property has setter");
                 assert_false(desc.writable, "property is writable");
                 assert_true(desc.enumerable, "property is not enumerable");
                 assert_false(desc.configurable, "property is configurable");
             }.bind(this), this.name + " exception: constant " + member.name + " on exception interface object");
             // "In addition, a property with the same characteristics must
             // exist on the exception interface prototype object."
             test(function()
             {
                 assert_own_property(window, this.name,
                                     "window does not have own property " + format_value(this.name));
                 assert_own_property(window[this.name], "prototype",
                                     'exception "' + this.name + '" does not have own property "prototype"');
                 assert_own_property(window[this.name].prototype, member.name);
                 assert_equals(window[this.name].prototype[member.name], constValue(member.value),
                               "property has wrong value");
                 var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, member.name);
                 assert_false("get" in desc, "property has getter");
                 assert_false("set" in desc, "property has setter");
                 assert_false(desc.writable, "property is writable");
                 assert_true(desc.enumerable, "property is not enumerable");
                 assert_false(desc.configurable, "property is configurable");
             }.bind(this), this.name + " exception: constant " + member.name + " on exception interface prototype object");
         }
         else if (member.type == "field")
         {
             test(function()
             {
                 assert_own_property(window, this.name,
                                     "window does not have own property " + format_value(this.name));
                 assert_own_property(window[this.name], "prototype",
                                     'exception "' + this.name + '" does not have own property "prototype"');
                 // "For each exception field, there must be a corresponding
                 // property on the exception interface prototype object, whose
                 // characteristics are as follows:
                 // "The name of the property is the identifier of the exception
                 // field."
                 assert_own_property(window[this.name].prototype, member.name);
                 // "The property has attributes { [[Get]]: G, [[Enumerable]]:
                 // true, [[Configurable]]: true }, where G is the exception
                 // field getter, defined below."
                 var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, member.name);
                 assert_false("value" in desc, "property descriptor has value but is supposed to be accessor");
                 assert_false("writable" in desc, 'property descriptor has "writable" field but is supposed to be accessor');
                 // TODO: ES5 doesn't seem to say whether desc should have a
                 // .set property.
                 assert_true(desc.enumerable, "property is not enumerable");
                 assert_true(desc.configurable, "property is not configurable");
                 // "The exception field getter is a Function object whose
                 // behavior when invoked is as follows:"
                 assert_equals(typeof desc.get, "function", "typeof getter");
                 // "The value of the Function object’s “length” property is the
                 // Number value 0."
                 // This test is before the TypeError tests so that it's easiest
                 // to see that Firefox 11a1 only fails one assert in this test.
                 assert_equals(desc.get.length, 0, "getter length");
                 // "Let O be the result of calling ToObject on the this value.
                 // "If O is not a platform object representing an exception for
                 // the exception on which the exception field was declared,
                 // then throw a TypeError."
                 // TODO: Test on a platform object representing an exception.
                 assert_throws(new TypeError(), function()
                 {
                     window[this.name].prototype[member.name];
                 }.bind(this), "getting property on prototype object must throw TypeError");
                 assert_throws(new TypeError(), function()
                 {
                     desc.get.call({});
                 }.bind(this), "calling getter on wrong object type must throw TypeError");
             }.bind(this), this.name + " exception: field " + member.name + " on exception interface prototype object");
         }
     }
 };
 //@}
 IdlException.prototype.test_object = function(desc)
 //@{
 {
     var obj, exception = null;
     try
     {
         obj = eval(desc);
     }
     catch(e)
     {
         exception = e;
     }
     test(function()
     {
         assert_equals(exception, null, "Unexpected exception when evaluating object");
         assert_equals(typeof obj, "object", "wrong typeof object");
         // We can't easily test that its prototype is correct if there's no
         // interface object, or the object is from a different global
         // environment (not instanceof Object).  TODO: test in this case that
         // its prototype at least looks correct, even if we can't test that
         // it's actually correct.
         if (!this.has_extended_attribute("NoInterfaceObject")
         && (typeof obj != "object" || obj instanceof Object))
         {
             assert_own_property(window, this.name,
                                 "window does not have own property " + format_value(this.name));
             assert_own_property(window[this.name], "prototype",
                                 'exception "' + this.name + '" does not have own property "prototype"');
             // "The value of the internal [[Prototype]] property of the
             // exception object must be the exception interface prototype
             // object from the global environment the exception object is
             // associated with."
             assert_equals(Object.getPrototypeOf(obj),
                           window[this.name].prototype,
                           desc + "'s prototype is not " + this.name + ".prototype");
         }
         // "The class string of the exception object must be the identifier of
         // the exception."
         assert_class_string(obj, this.name, "class string of " + desc);
         // Stringifier is not defined for DOMExceptions, because message isn't
         // defined.
     }.bind(this), this.name + " must be represented by " + desc);
     for (var i = 0; i < this.members.length; i++)
     {
         var member = this.members[i];
         test(function()
         {
             assert_equals(exception, null, "Unexpected exception when evaluating object");
             assert_equals(typeof obj, "object", "wrong typeof object");
             assert_inherits(obj, member.name);
             if (member.type == "const")
             {
                 assert_equals(obj[member.name], constValue(member.value));
             }
             if (member.type == "field")
             {
                 this.array.assert_type_is(obj[member.name], member.idlType);
             }
         }.bind(this), this.name + " exception: " + desc + ' must inherit property "' + member.name + '" with the proper type');
     }
 };
 //@}
 /// IdlInterface ///
 function IdlInterface(obj) { IdlExceptionOrInterface.call(this, obj); }
 IdlInterface.prototype = Object.create(IdlExceptionOrInterface.prototype);
 IdlInterface.prototype.is_callback = function()
 //@{
 {
     return this.has_extended_attribute("Callback");
 };
 //@}
 IdlInterface.prototype.has_constants = function()
 //@{
 {
     return this.members.some(function(member) {
         return member.type === "const";
     });
 };
 //@}
 IdlInterface.prototype.test_self = function()
 //@{
 {
     test(function()
     {
         // This function tests WebIDL as of 2012-11-28.
         // "For every interface that:
         // * is a callback interface that has constants declared on it, or
         // * is a non-callback interface that is not declared with the
         //   [NoInterfaceObject] extended attribute,
         // a corresponding property MUST exist on the ECMAScript global object.
         // The name of the property is the identifier of the interface, and its
         // value is an object called the interface object.
         // The property has the attributes { [[Writable]]: true,
         // [[Enumerable]]: false, [[Configurable]]: true }."
         if (this.is_callback() && !this.has_constants()) {
             return;
         }
         // TODO: Should we test here that the property is actually writable
         // etc., or trust getOwnPropertyDescriptor?
         assert_own_property(window, this.name,
                             "window does not have own property " + format_value(this.name));
         var desc = Object.getOwnPropertyDescriptor(window, this.name);
         assert_false("get" in desc, "window's property " + format_value(this.name) + " has getter");
         assert_false("set" in desc, "window's property " + format_value(this.name) + " has setter");
         assert_true(desc.writable, "window's property " + format_value(this.name) + " is not writable");
         assert_false(desc.enumerable, "window's property " + format_value(this.name) + " is enumerable");
         assert_true(desc.configurable, "window's property " + format_value(this.name) + " is not configurable");
         if (this.is_callback()) {
             // "The internal [[Prototype]] property of an interface object for
             // a callback interface MUST be the Object.prototype object."
             assert_equals(Object.getPrototypeOf(window[this.name]), Object.prototype,
                           "prototype of window's property " + format_value(this.name) + " is not Object.prototype");
             return;
         }
         // "The interface object for a given non-callback interface is a
         // function object."
         // "If an object is defined to be a function object, then it has
         // characteristics as follows:"
         // "* Its [[Prototype]] internal property is the Function prototype
         //    object."
         assert_equals(Object.getPrototypeOf(window[this.name]), Function.prototype,
                       "prototype of window's property " + format_value(this.name) + " is not Function.prototype");
         // "* Its [[Get]] internal property is set as described in ECMA-262
         //    section 15.3.5.4."
         // Not much to test for this.
         // "* Its [[Construct]] internal property is set as described in
         //    ECMA-262 section 13.2.2."
         // Tested below if no constructor is defined.  TODO: test constructors
         // if defined.
         // "* Its [[HasInstance]] internal property is set as described in
         //    ECMA-262 section 15.3.5.3, unless otherwise specified."
         // TODO
         // "* Its [[NativeBrand]] internal property is “Function”."
         // String() returns something implementation-dependent, because it calls
         // Function#toString.
         assert_class_string(window[this.name], "Function", "class string of " + this.name);
         if (!this.has_extended_attribute("Constructor")) {
             // "The internal [[Call]] method of the interface object behaves as
             // follows . . .
             //
             // "If I was not declared with a [Constructor] extended attribute,
             // then throw a TypeError."
             assert_throws(new TypeError(), function() {
                 window[this.name]();
             }.bind(this), "interface object didn't throw TypeError when called as a function");
             assert_throws(new TypeError(), function() {
                 new window[this.name]();
             }.bind(this), "interface object didn't throw TypeError when called as a constructor");
         }
     }.bind(this), this.name + " interface: existence and properties of interface object");
     if (!this.is_callback()) {
         test(function() {
             // This function tests WebIDL as of 2013-08-25.
             // http://dev.w3.org/2006/webapi/WebIDL/#es-interface-call
             assert_own_property(window, this.name,
                                 "window does not have own property " + format_value(this.name));
             // "Interface objects for non-callback interfaces MUST have a
             // property named “length” with attributes { [[Writable]]: false,
             // [[Enumerable]]: false, [[Configurable]]: false } whose value is
             // a Number."
             assert_own_property(window[this.name], "length");
             var desc = Object.getOwnPropertyDescriptor(window[this.name], "length");
             assert_false("get" in desc, this.name + ".length has getter");
             assert_false("set" in desc, this.name + ".length has setter");
             assert_false(desc.writable, this.name + ".length is writable");
             assert_false(desc.enumerable, this.name + ".length is enumerable");
             assert_false(desc.configurable, this.name + ".length is configurable");
             var constructors = this.extAttrs
                 .filter(function(attr) { return attr.name == "Constructor"; });
             var expected_length;
             if (!constructors.length) {
                 // "If the [Constructor] extended attribute, does not appear on
                 // the interface definition, then the value is 0."
                 expected_length = 0;
             } else {
                 // "Otherwise, the value is determined as follows: . . .
                 // "Return the length of the shortest argument list of the
                 // entries in S."
                 expected_length = constructors.map(function(attr) {
                     return attr.arguments ? attr.arguments.filter(function(arg) {
                         return !arg.optional;
                     }).length : 0;
                 })
                 .reduce(function(m, n) { return Math.min(m, n); });
             }
             assert_equals(window[this.name].length, expected_length, "wrong value for " + this.name + ".length");
         }.bind(this), this.name + " interface object length");
     }
     // TODO: Test named constructors if I find any interfaces that have them.
     test(function()
     {
         assert_own_property(window, this.name,
                             "window does not have own property " + format_value(this.name));
         if (this.has_extended_attribute("Callback")) {
             assert_false("prototype" in window[this.name],
                          this.name + ' should not have a "prototype" property');
             return;
         }
         // "The interface object must also have a property named “prototype”
         // with attributes { [[Writable]]: false, [[Enumerable]]: false,
         // [[Configurable]]: false } whose value is an object called the
         // interface prototype object. This object has properties that
         // correspond to the attributes and operations defined on the
         // interface, and is described in more detail in section 4.5.3 below."
         assert_own_property(window[this.name], "prototype",
                             'interface "' + this.name + '" does not have own property "prototype"');
         var desc = Object.getOwnPropertyDescriptor(window[this.name], "prototype");
         assert_false("get" in desc, this.name + ".prototype has getter");
         assert_false("set" in desc, this.name + ".prototype has setter");
         assert_false(desc.writable, this.name + ".prototype is writable");
         assert_false(desc.enumerable, this.name + ".prototype is enumerable");
         assert_false(desc.configurable, this.name + ".prototype is configurable");
         // Next, test that the [[Prototype]] of the interface prototype object
         // is correct. (This is made somewhat difficult by the existence of
         // [NoInterfaceObject].)
         // TODO: Aryeh thinks there's at least other place in this file where
         //       we try to figure out if an interface prototype object is
         //       correct. Consolidate that code.
         // "The interface prototype object for a given interface A must have an
         // internal [[Prototype]] property whose value is as follows:
         // "If A is not declared to inherit from another interface, then the
         // value of the internal [[Prototype]] property of A is the Array
         // prototype object ([ECMA-262], section 15.4.4) if the interface was
         // declared with ArrayClass, or the Object prototype object otherwise
         // ([ECMA-262], section 15.2.4).
         // "Otherwise, A does inherit from another interface. The value of the
         // internal [[Prototype]] property of A is the interface prototype
         // object for the inherited interface."
         var inherit_interface, inherit_interface_has_interface_object;
         if (this.base) {
             inherit_interface = this.base;
             inherit_interface_has_interface_object =
                 !this.array
                      .members[inherit_interface]
                      .has_extended_attribute("NoInterfaceObject");
         } else if (this.has_extended_attribute('ArrayClass')) {
             inherit_interface = 'Array';
             inherit_interface_has_interface_object = true;
         } else {
             inherit_interface = 'Object';
             inherit_interface_has_interface_object = true;
         }
         if (inherit_interface_has_interface_object) {
             assert_own_property(window, inherit_interface,
                                 'should inherit from ' + inherit_interface + ', but window has no such property');
             assert_own_property(window[inherit_interface], 'prototype',
                                 'should inherit from ' + inherit_interface + ', but that object has no "prototype" property');
             assert_equals(Object.getPrototypeOf(window[this.name].prototype),
                           window[inherit_interface].prototype,
                           'prototype of ' + this.name + '.prototype is not ' + inherit_interface + '.prototype');
         } else {
             // We can't test that we get the correct object, because this is the
             // only way to get our hands on it. We only test that its class
             // string, at least, is correct.
             assert_class_string(Object.getPrototypeOf(window[this.name].prototype),
                                 inherit_interface + 'Prototype',
                                 'Class name for prototype of ' + this.name +
                                 '.prototype is not "' + inherit_interface + 'Prototype"');
         }
         // "The class string of an interface prototype object is the
         // concatenation of the interface’s identifier and the string
         // “Prototype”."
         assert_class_string(window[this.name].prototype, this.name + "Prototype",
                             "class string of " + this.name + ".prototype");
         // String() should end up calling {}.toString if nothing defines a
         // stringifier.
         if (!this.has_stringifier()) {
             assert_equals(String(window[this.name].prototype), "[object " + this.name + "Prototype]",
                     "String(" + this.name + ".prototype)");
         }
     }.bind(this), this.name + " interface: existence and properties of interface prototype object");
     test(function()
     {
         assert_own_property(window, this.name,
                             "window does not have own property " + format_value(this.name));
         if (this.has_extended_attribute("Callback")) {
             assert_false("prototype" in window[this.name],
                          this.name + ' should not have a "prototype" property');
             return;
         }
         assert_own_property(window[this.name], "prototype",
                             'interface "' + this.name + '" does not have own property "prototype"');
         // "If the [NoInterfaceObject] extended attribute was not specified on
         // the interface, then the interface prototype object must also have a
         // property named “constructor” with attributes { [[Writable]]: true,
         // [[Enumerable]]: false, [[Configurable]]: true } whose value is a
         // reference to the interface object for the interface."
         assert_own_property(window[this.name].prototype, "constructor",
                             this.name + '.prototype does not have own property "constructor"');
         var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, "constructor");
         assert_false("get" in desc, this.name + ".prototype.constructor has getter");
         assert_false("set" in desc, this.name + ".prototype.constructor has setter");
         assert_true(desc.writable, this.name + ".prototype.constructor is not writable");
         assert_false(desc.enumerable, this.name + ".prototype.constructor is enumerable");
         assert_true(desc.configurable, this.name + ".prototype.constructor in not configurable");
         assert_equals(window[this.name].prototype.constructor, window[this.name],
                       this.name + '.prototype.constructor is not the same object as ' + this.name);
     }.bind(this), this.name + ' interface: existence and properties of interface prototype object\'s "constructor" property');
 };
 //@}
 IdlInterface.prototype.test_members = function()
 //@{
 {
     for (var i = 0; i < this.members.length; i++)
     {
         var member = this.members[i];
         if (member.untested)
         {
             continue;
         }
         if (member.type == "const")
         {
             test(function()
             {
                 assert_own_property(window, this.name,
                                     "window does not have own property " + format_value(this.name));
                 // "For each constant defined on an interface A, there must be
                 // a corresponding property on the interface object, if it
                 // exists."
                 assert_own_property(window[this.name], member.name);
                 // "The value of the property is that which is obtained by
                 // converting the constant’s IDL value to an ECMAScript
                 // value."
                 assert_equals(window[this.name][member.name], constValue(member.value),
                               "property has wrong value");
                 // "The property has attributes { [[Writable]]: false,
                 // [[Enumerable]]: true, [[Configurable]]: false }."
                 var desc = Object.getOwnPropertyDescriptor(window[this.name], member.name);
                 assert_false("get" in desc, "property has getter");
                 assert_false("set" in desc, "property has setter");
                 assert_false(desc.writable, "property is writable");
                 assert_true(desc.enumerable, "property is not enumerable");
                 assert_false(desc.configurable, "property is configurable");
             }.bind(this), this.name + " interface: constant " + member.name + " on interface object");
             // "In addition, a property with the same characteristics must
             // exist on the interface prototype object."
             test(function()
             {
                 assert_own_property(window, this.name,
                                     "window does not have own property " + format_value(this.name));
                 if (this.has_extended_attribute("Callback")) {
                     assert_false("prototype" in window[this.name],
                                  this.name + ' should not have a "prototype" property');
                     return;
                 }
                 assert_own_property(window[this.name], "prototype",
                                     'interface "' + this.name + '" does not have own property "prototype"');
                 assert_own_property(window[this.name].prototype, member.name);
                 assert_equals(window[this.name].prototype[member.name], constValue(member.value),
                               "property has wrong value");
                 var desc = Object.getOwnPropertyDescriptor(window[this.name], member.name);
                 assert_false("get" in desc, "property has getter");
                 assert_false("set" in desc, "property has setter");
                 assert_false(desc.writable, "property is writable");
                 assert_true(desc.enumerable, "property is not enumerable");
                 assert_false(desc.configurable, "property is configurable");
             }.bind(this), this.name + " interface: constant " + member.name + " on interface prototype object");
         }
         else if (member.type == "attribute")
         {
             if (member.has_extended_attribute("Unforgeable"))
             {
                 // We do the checks in test_interface_of instead
                 continue;
             }
             test(function()
             {
                 assert_own_property(window, this.name,
                                     "window does not have own property " + format_value(this.name));
                 assert_own_property(window[this.name], "prototype",
                                     'interface "' + this.name + '" does not have own property "prototype"');
                 if (member["static"]) {
                     assert_own_property(window[this.name], member.name,
                         "The interface object must have a property " +
                         format_value(member.name));
                 }
                 else
                 {
                     assert_true(member.name in window[this.name].prototype,
                         "The prototype object must have a property " +
                         format_value(member.name));
                     // TODO: Needs to test for LenientThis.
                     assert_throws(new TypeError(), function() {
                         window[this.name].prototype[member.name];
                     }.bind(this), "getting property on prototype object must throw TypeError");
                     do_interface_attribute_asserts(window[this.name].prototype, member);
                 }
             }.bind(this), this.name + " interface: attribute " + member.name);
         }
         else if (member.type == "operation")
         {
             // TODO: Need to correctly handle multiple operations with the same
             // identifier.
             if (!member.name)
             {
                 // Unnamed getter or such
                 continue;
             }
             test(function()
             {
                 assert_own_property(window, this.name,
                                     "window does not have own property " + format_value(this.name));
                 if (this.has_extended_attribute("Callback")) {
                     assert_false("prototype" in window[this.name],
                                  this.name + ' should not have a "prototype" property');
                     return;
                 }
                 assert_own_property(window[this.name], "prototype",
                                     'interface "' + this.name + '" does not have own property "prototype"');
                 // "For each unique identifier of an operation defined on the
                 // interface, there must be a corresponding property on the
                 // interface prototype object (if it is a regular operation) or
                 // the interface object (if it is a static operation), unless
                 // the effective overload set for that identifier and operation
                 // and with an argument count of 0 (for the ECMAScript language
                 // binding) has no entries."
                 //
                 var prototypeOrInterfaceObject;
                 if (member["static"]) {
                     assert_own_property(window[this.name], member.name,
                             "interface prototype object missing static operation");
                     prototypeOrInterfaceObject = window[this.name];
                 }
                 else
                 {
                     assert_own_property(window[this.name].prototype, member.name,
                             "interface prototype object missing non-static operation");
                     prototypeOrInterfaceObject = window[this.name].prototype;
                 }
                 var desc = Object.getOwnPropertyDescriptor(prototypeOrInterfaceObject, member.name);
                 // "The property has attributes { [[Writable]]: true,
                 // [[Enumerable]]: true, [[Configurable]]: true }."
                 assert_false("get" in desc, "property has getter");
                 assert_false("set" in desc, "property has setter");
                 assert_true(desc.writable, "property is not writable");
                 assert_true(desc.enumerable, "property is not enumerable");
                 assert_true(desc.configurable, "property is not configurable");
                 // "The value of the property is a Function object whose
                 // behavior is as follows . . ."
                 assert_equals(typeof prototypeOrInterfaceObject[member.name], "function",
                               "property must be a function");
                 // "The value of the Function object’s “length” property is
                 // a Number determined as follows:
                 // ". . .
                 // "Return the length of the shortest argument list of the
                 // entries in S."
                 //
                 // TODO: Doesn't handle overloading or variadic arguments.
                 assert_equals(prototypeOrInterfaceObject[member.name].length,
                     member.arguments.filter(function(arg) {
                         return !arg.optional;
                     }).length,
                     "property has wrong .length");
                 // Make some suitable arguments
                 var args = member.arguments.map(function(arg) {
                     return create_suitable_object(arg.idlType);
                 });
                 // "Let O be a value determined as follows:
                 // ". . .
                 // "Otherwise, throw a TypeError."
                 // This should be hit if the operation is not static, there is
                 // no [ImplicitThis] attribute, and the this value is null.
                 //
                 // TODO: We currently ignore the [ImplicitThis] case.
                 if (!member["static"]) {
                     assert_throws(new TypeError(), function() {
                         window[this.name].prototype[member.name].apply(null, args);
                     }, "calling operation with this = null didn't throw TypeError");
                 }
                 // ". . . If O is not null and is also not a platform object
                 // that implements interface I, throw a TypeError."
                 //
                 // TODO: Test a platform object that implements some other
                 // interface.  (Have to be sure to get inheritance right.)
                 assert_throws(new TypeError(), function() {
                     window[this.name].prototype[member.name].apply({}, args);
                 }, "calling operation with this = {} didn't throw TypeError");
             }.bind(this), this.name + " interface: operation " + member.name +
             "(" + member.arguments.map(function(m) { return m.idlType.idlType; }) +
             ")");
         }
         // TODO: check more member types, like stringifier
     }
 };
 //@}
 IdlInterface.prototype.test_object = function(desc)
 //@{
 {
     var obj, exception = null;
     try
     {
         obj = eval(desc);
     }
     catch(e)
     {
         exception = e;
     }
     // TODO: WebIDLParser doesn't currently support named legacycallers, so I'm
     // not sure what those would look like in the AST
     var expected_typeof = this.members.some(function(member)
     {
         return member.legacycaller
             || ("idlType" in member && member.idlType.legacycaller)
             || ("idlType" in member && typeof member.idlType == "object"
             && "idlType" in member.idlType && member.idlType.idlType == "legacycaller");
     }) ? "function" : "object";
     this.test_primary_interface_of(desc, obj, exception, expected_typeof);
     var current_interface = this;
     while (current_interface)
     {
         if (!(current_interface.name in this.array.members))
         {
             throw "Interface " + current_interface.name + " not found (inherited by " + this.name + ")";
         }
         if (current_interface.prevent_multiple_testing && current_interface.already_tested)
         {
             return;
         }
         current_interface.test_interface_of(desc, obj, exception, expected_typeof);
         current_interface = this.array.members[current_interface.base];
     }
 };
 //@}
 IdlInterface.prototype.test_primary_interface_of = function(desc, obj, exception, expected_typeof)
 //@{
 {
     // We can't easily test that its prototype is correct if there's no
     // interface object, or the object is from a different global environment
     // (not instanceof Object).  TODO: test in this case that its prototype at
     // least looks correct, even if we can't test that it's actually correct.
     if (!this.has_extended_attribute("NoInterfaceObject")
     && (typeof obj != expected_typeof || obj instanceof Object))
     {
         test(function()
         {
             assert_equals(exception, null, "Unexpected exception when evaluating object");
             assert_equals(typeof obj, expected_typeof, "wrong typeof object");
             assert_own_property(window, this.name,
                                 "window does not have own property " + format_value(this.name));
             assert_own_property(window[this.name], "prototype",
                                 'interface "' + this.name + '" does not have own property "prototype"');
             // "The value of the internal [[Prototype]] property of the
             // platform object is the interface prototype object of the primary
             // interface from the platform object’s associated global
             // environment."
             assert_equals(Object.getPrototypeOf(obj),
                           window[this.name].prototype,
                           desc + "'s prototype is not " + this.name + ".prototype");
         }.bind(this), this.name + " must be primary interface of " + desc);
     }
     // "The class string of a platform object that implements one or more
     // interfaces must be the identifier of the primary interface of the
     // platform object."
     test(function()
     {
         assert_equals(exception, null, "Unexpected exception when evaluating object");
         assert_equals(typeof obj, expected_typeof, "wrong typeof object");
         assert_class_string(obj, this.name, "class string of " + desc);
         if (!this.has_stringifier())
         {
             assert_equals(String(obj), "[object " + this.name + "]", "String(" + desc + ")");
         }
     }.bind(this), "Stringification of " + desc);
 };
 //@}
 IdlInterface.prototype.test_interface_of = function(desc, obj, exception, expected_typeof)
 //@{
 {
     // TODO: Indexed and named properties, more checks on interface members
     this.already_tested = true;
     for (var i = 0; i < this.members.length; i++)
     {
         var member = this.members[i];
         if (member.has_extended_attribute("Unforgeable"))
         {
             test(function()
             {
                 assert_equals(exception, null, "Unexpected exception when evaluating object");
                 assert_equals(typeof obj, expected_typeof, "wrong typeof object");
                 do_interface_attribute_asserts(obj, member);
             }.bind(this), this.name + " interface: " + desc + ' must have own property "' + member.name + '"');
         }
         else if ((member.type == "const"
         || member.type == "attribute"
         || member.type == "operation")
         && member.name)
         {
             test(function()
             {
                 assert_equals(exception, null, "Unexpected exception when evaluating object");
                 assert_equals(typeof obj, expected_typeof, "wrong typeof object");
                 if (!member["static"]) {
                     assert_inherits(obj, member.name);
                     if (member.type == "const")
                     {
                         assert_equals(obj[member.name], constValue(member.value));
                     }
                     if (member.type == "attribute")
                     {
                         // Attributes are accessor properties, so they might
                         // legitimately throw an exception rather than returning
                         // anything.
                         var property, thrown = false;
                         try
                         {
                             property = obj[member.name];
                         }
                         catch (e)
                         {
                             thrown = true;
                         }
                         if (!thrown)
                         {
                             this.array.assert_type_is(property, member.idlType);
                         }
                     }
                     if (member.type == "operation")
                     {
                         assert_equals(typeof obj[member.name], "function");
                     }
                 }
             }.bind(this), this.name + " interface: " + desc + ' must inherit property "' + member.name + '" with the proper type (' + i + ')');
         }
         // TODO: This is wrong if there are multiple operations with the same
         // identifier.
         // TODO: Test passing arguments of the wrong type.
         if (member.type == "operation" && member.name && member.arguments.length)
         {
             test(function()
             {
                 assert_equals(exception, null, "Unexpected exception when evaluating object");
                 assert_equals(typeof obj, expected_typeof, "wrong typeof object");
                 if (!member["static"]) {
                     assert_inherits(obj, member.name);
                 }
                 else
                 {
                     assert_false(member.name in obj);
                 }
                 var args = [];
                 for (var i = 0; i < member.arguments.length; i++)
                 {
                     if (member.arguments[i].optional)
                     {
                         break;
                     }
                     assert_throws(new TypeError(), function()
                     {
                         obj[member.name].apply(obj, args);
                     }.bind(this), "Called with " + i + " arguments");
                     args.push(create_suitable_object(member.arguments[i].idlType));
                 }
             }.bind(this), this.name + " interface: calling " + member.name +
             "(" + member.arguments.map(function(m) { return m.idlType.idlType; }) +
             ") on " + desc + " with too few arguments must throw TypeError");
         }
     }
 };
 //@}
 IdlInterface.prototype.has_stringifier = function()
 //@{
 {
     if (this.members.some(function(member) { return member.stringifier; })) {
         return true;
     }
     if (this.base &&
         this.array.members[this.base].has_stringifier()) {
         return true;
     }
     return false;
 };
 //@}
 function do_interface_attribute_asserts(obj, member)
 //@{
 {
     // "For each attribute defined on the interface, there must exist a
     // corresponding property. If the attribute was declared with the
     // [Unforgeable] extended attribute, then the property exists on every
     // object that implements the interface.  Otherwise, it exists on the
     // interface’s interface prototype object."
     //
     // This is called by test_self() with the prototype as obj, and by
     // test_interface_of() with the object as obj.
     assert_own_property(obj, member.name);
     // "The property has attributes { [[Get]]: G, [[Set]]: S, [[Enumerable]]:
     // true, [[Configurable]]: configurable }, where:
     // "configurable is false if the attribute was declared with the
     // [Unforgeable] extended attribute and true otherwise;
     // "G is the attribute getter, defined below; and
     // "S is the attribute setter, also defined below."
     var desc = Object.getOwnPropertyDescriptor(obj, member.name);
     assert_false("value" in desc, 'property descriptor has value but is supposed to be accessor');
     assert_false("writable" in desc, 'property descriptor has "writable" field but is supposed to be accessor');
     assert_true(desc.enumerable, "property is not enumerable");
     if (member.has_extended_attribute("Unforgeable"))
     {
         assert_false(desc.configurable, "[Unforgeable] property must not be configurable");
     }
     else
     {
         assert_true(desc.configurable, "property must be configurable");
     }
     // "The attribute getter is a Function object whose behavior when invoked
     // is as follows:
     // "...
     // "The value of the Function object’s “length” property is the Number
     // value 0."
     assert_equals(typeof desc.get, "function", "getter must be Function");
     assert_equals(desc.get.length, 0, "getter length must be 0");
     // TODO: Account for LenientThis
     assert_throws(new TypeError(), function()
     {
         desc.get.call({});
     }.bind(this), "calling getter on wrong object type must throw TypeError");
     // TODO: Test calling setter on the interface prototype (should throw
     // TypeError in most cases).
     //
     // "The attribute setter is undefined if the attribute is declared readonly
     // and has neither a [PutForwards] nor a [Replaceable] extended attribute
     // declared on it.  Otherwise, it is a Function object whose behavior when
     // invoked is as follows:
     // "...
     // "The value of the Function object’s “length” property is the Number
     // value 1."
     if (member.readonly
     && !member.has_extended_attribute("PutForwards")
     && !member.has_extended_attribute("Replaceable"))
     {
         assert_equals(desc.set, undefined, "setter must be undefined for readonly attributes");
     }
     else
     {
         assert_equals(typeof desc.set, "function", "setter must be function for PutForwards, Replaceable, or non-readonly attributes");
         assert_equals(desc.set.length, 1, "setter length must be 1");
     }
 }
 //@}
 /// IdlInterfaceMember ///
 function IdlInterfaceMember(obj)
 //@{
 {
     /**
      * obj is an object produced by the WebIDLParser.js "ifMember" production.
      * We just forward all properties to this object without modification,
      * except for special extAttrs handling.
      */
     for (var k in obj)
     {
         this[k] = obj[k];
     }
     if (!("extAttrs" in this))
     {
         this.extAttrs = [];
     }
 }
 //@}
 IdlInterfaceMember.prototype = Object.create(IdlObject.prototype);
 /// Internal helper functions ///
 function create_suitable_object(type)
 //@{
 {
     /**
      * type is an object produced by the WebIDLParser.js "type" production.  We
      * return a JavaScript value that matches the type, if we can figure out
      * how.
      */
     if (type.nullable)
     {
         return null;
     }
     switch (type.idlType)
     {
         case "any":
         case "boolean":
             return true;
         case "byte": case "octet": case "short": case "unsigned short":
         case "long": case "unsigned long": case "long long":
         case "unsigned long long": case "float": case "double":
         case "unrestricted float": case "unrestricted double":
             return 7;
         case "DOMString":
             return "foo";
         case "object":
             return {a: "b"};
         case "Node":
             return document.createTextNode("abc");
     }
     return null;
 }
 //@}
 /// IdlEnum ///
 // Used for IdlArray.prototype.assert_type_is
 function IdlEnum(obj)
 //@{
 {
     /**
      * obj is an object produced by the WebIDLParser.js "dictionary"
      * production.
      */
     /** Self-explanatory. */
     this.name = obj.name;
     /** An array of values produced by the "enum" production. */
     this.values = obj.values;
 }
 //@}
 IdlEnum.prototype = Object.create(IdlObject.prototype);
 /// IdlTypedef ///
 // Used for IdlArray.prototype.assert_type_is
 function IdlTypedef(obj)
 //@{
 {
     /**
      * obj is an object produced by the WebIDLParser.js "typedef"
      * production.
      */
     /** Self-explanatory. */
     this.name = obj.name;
     /** An array of values produced by the "typedef" production. */
     this.values = obj.values;
 }
 //@}
 IdlTypedef.prototype = Object.create(IdlObject.prototype);
 }());
 // vim: set expandtab shiftwidth=4 tabstop=4 foldmarker=@{,@} foldmethod=marker: