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restricter.js
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/**
* almond 0.0.3 Copyright (c) 2011, The Dojo Foundation All Rights Reserved.
* Available via the MIT or new BSD license.
* see: http://github.com/jrburke/almond for details
*/
/*jslint strict: false, plusplus: false */
/*global setTimeout: false */
var requirejs, require, define;
(function (undef) {
var defined = {},
waiting = {},
aps = [].slice,
main, req;
if (typeof define === "function") {
//If a define is already in play via another AMD loader,
//do not overwrite.
return;
}
/**
* Given a relative module name, like ./something, normalize it to
* a real name that can be mapped to a path.
* @param {String} name the relative name
* @param {String} baseName a real name that the name arg is relative
* to.
* @returns {String} normalized name
*/
function normalize(name, baseName) {
//Adjust any relative paths.
if (name && name.charAt(0) === ".") {
//If have a base name, try to normalize against it,
//otherwise, assume it is a top-level require that will
//be relative to baseUrl in the end.
if (baseName) {
//Convert baseName to array, and lop off the last part,
//so that . matches that "directory" and not name of the baseName's
//module. For instance, baseName of "one/two/three", maps to
//"one/two/three.js", but we want the directory, "one/two" for
//this normalization.
baseName = baseName.split("/");
baseName = baseName.slice(0, baseName.length - 1);
name = baseName.concat(name.split("/"));
//start trimDots
var i, part;
for (i = 0; (part = name[i]); i++) {
if (part === ".") {
name.splice(i, 1);
i -= 1;
} else if (part === "..") {
if (i === 1 && (name[2] === '..' || name[0] === '..')) {
//End of the line. Keep at least one non-dot
//path segment at the front so it can be mapped
//correctly to disk. Otherwise, there is likely
//no path mapping for a path starting with '..'.
//This can still fail, but catches the most reasonable
//uses of ..
break;
} else if (i > 0) {
name.splice(i - 1, 2);
i -= 2;
}
}
}
//end trimDots
name = name.join("/");
}
}
return name;
}
function makeRequire(relName, forceSync) {
return function () {
//A version of a require function that passes a moduleName
//value for items that may need to
//look up paths relative to the moduleName
return req.apply(undef, aps.call(arguments, 0).concat([relName, forceSync]));
};
}
function makeNormalize(relName) {
return function (name) {
return normalize(name, relName);
};
}
function makeLoad(depName) {
return function (value) {
defined[depName] = value;
};
}
function callDep(name) {
if (waiting.hasOwnProperty(name)) {
var args = waiting[name];
delete waiting[name];
main.apply(undef, args);
}
return defined[name];
}
/**
* Makes a name map, normalizing the name, and using a plugin
* for normalization if necessary. Grabs a ref to plugin
* too, as an optimization.
*/
function makeMap(name, relName) {
var prefix, plugin,
index = name.indexOf('!');
if (index !== -1) {
prefix = normalize(name.slice(0, index), relName);
name = name.slice(index + 1);
plugin = callDep(prefix);
//Normalize according
if (plugin && plugin.normalize) {
name = plugin.normalize(name, makeNormalize(relName));
} else {
name = normalize(name, relName);
}
} else {
name = normalize(name, relName);
}
//Using ridiculous property names for space reasons
return {
f: prefix ? prefix + '!' + name : name, //fullName
n: name,
p: plugin
};
}
main = function (name, deps, callback, relName) {
var args = [],
usingExports,
cjsModule, depName, i, ret, map;
//Use name if no relName
if (!relName) {
relName = name;
}
//Call the callback to define the module, if necessary.
if (typeof callback === 'function') {
//Default to require, exports, module if no deps if
//the factory arg has any arguments specified.
if (!deps.length && callback.length) {
deps = ['require', 'exports', 'module'];
}
//Pull out the defined dependencies and pass the ordered
//values to the callback.
for (i = 0; i < deps.length; i++) {
map = makeMap(deps[i], relName);
depName = map.f;
//Fast path CommonJS standard dependencies.
if (depName === "require") {
args[i] = makeRequire(name);
} else if (depName === "exports") {
//CommonJS module spec 1.1
args[i] = defined[name] = {};
usingExports = true;
} else if (depName === "module") {
//CommonJS module spec 1.1
cjsModule = args[i] = {
id: name,
uri: '',
exports: defined[name]
};
} else if (defined.hasOwnProperty(depName) || waiting.hasOwnProperty(depName)) {
args[i] = callDep(depName);
} else if (map.p) {
map.p.load(map.n, makeRequire(relName, true), makeLoad(depName), {});
args[i] = defined[depName];
} else {
throw name + ' missing ' + depName;
}
}
ret = callback.apply(defined[name], args);
if (name) {
//If setting exports via "module" is in play,
//favor that over return value and exports. After that,
//favor a non-undefined return value over exports use.
if (cjsModule && cjsModule.exports !== undef) {
defined[name] = cjsModule.exports;
} else if (!usingExports) {
//Use the return value from the function.
defined[name] = ret;
}
}
} else if (name) {
//May just be an object definition for the module. Only
//worry about defining if have a module name.
defined[name] = callback;
}
};
requirejs = req = function (deps, callback, relName, forceSync) {
if (typeof deps === "string") {
//Just return the module wanted. In this scenario, the
//deps arg is the module name, and second arg (if passed)
//is just the relName.
//Normalize module name, if it contains . or ..
return callDep(makeMap(deps, callback).f);
} else if (!deps.splice) {
//deps is a config object, not an array.
//Drop the config stuff on the ground.
if (callback.splice) {
//callback is an array, which means it is a dependency list.
//Adjust args if there are dependencies
deps = callback;
callback = arguments[2];
} else {
deps = [];
}
}
//Simulate async callback;
if (forceSync) {
main(undef, deps, callback, relName);
} else {
setTimeout(function () {
main(undef, deps, callback, relName);
}, 15);
}
return req;
};
/**
* Just drops the config on the floor, but returns req in case
* the config return value is used.
*/
req.config = function () {
return req;
};
/**
* Export require as a global, but only if it does not already exist.
*/
if (!require) {
require = req;
}
define = function (name, deps, callback) {
//This module may not have dependencies
if (!deps.splice) {
//deps is not an array, so probably means
//an object literal or factory function for
//the value. Adjust args.
callback = deps;
deps = [];
}
if (define.unordered) {
waiting[name] = [name, deps, callback];
} else {
main(name, deps, callback);
}
};
define.amd = {
jQuery: true
};
}());
define("../build/almond.js", function(){});
// ECMAScript3 versions of ECMAScript5 constructs used in Narcissus parser
// All properties will be writable, configurable and enumerable, no matter
// the descriptor. Descriptor get/set is also ignored.
define('jsecma5',[], function() {
if (Object.defineProperty === undefined) {
Object.defineProperty = function(obj, prop, descriptor) {
obj[prop] = descriptor.value;
};
}
if (Object.defineProperties === undefined) {
Object.defineProperties = function(obj, props) {
for (var prop in props) {
if (props.hasOwnProperty(prop)) {
Object.defineProperty(obj, prop, props[prop]);
}
}
};
}
if (Object.create === undefined) {
Object.create = function(obj, props) {
function ctor() {}
ctor.prototype = obj;
var o = new ctor();
if (props !== undefined) {
Object.defineProperties(o, props);
}
return o;
};
}
});
define('narcissus/lib/n',[], function() {
return {
options: {
version: 185,
// Global variables to hide from the interpreter
hiddenHostGlobals: { Narcissus: true },
// Desugar SpiderMonkey language extensions?
desugarExtensions: false,
// Allow HTML comments?
allowHTMLComments: false
},
hostSupportsEvalConst: (function() {
try {
return eval("(function(s) { eval(s); return x })('const x = true;')");
} catch (e) {
return false;
}
})(),
hostGlobal: this
};
});
/* vim: set sw=4 ts=4 et tw=78: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Narcissus JavaScript engine.
*
* The Initial Developer of the Original Code is
* Brendan Eich <[email protected]>.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Tom Austin <[email protected]>
* Brendan Eich <[email protected]>
* Shu-Yu Guo <[email protected]>
* Dave Herman <[email protected]>
* Dimitris Vardoulakis <[email protected]>
* Patrick Walton <[email protected]>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* Narcissus - JS implemented in JS.
*
* Well-known constants and lookup tables. Many consts are generated from the
* tokens table via eval to minimize redundancy, so consumers must be compiled
* separately to take advantage of the simple switch-case constant propagation
* done by SpiderMonkey.
*/
define('narcissus/lib/jsdefs',['./n'], function(Narcissus) {
Narcissus.definitions = (function(hostGlobal) {
var tokens = [
// End of source.
"END",
// Operators and punctuators. Some pair-wise order matters, e.g. (+, -)
// and (UNARY_PLUS, UNARY_MINUS).
"\n", ";",
",",
"=",
"?", ":", "CONDITIONAL",
"||",
"&&",
"|",
"^",
"&",
"==", "!=", "===", "!==",
"<", "<=", ">=", ">",
"<<", ">>", ">>>",
"+", "-",
"*", "/", "%",
"!", "~", "UNARY_PLUS", "UNARY_MINUS",
"++", "--",
".",
"[", "]",
"{", "}",
"(", ")",
// Nonterminal tree node type codes.
"SCRIPT", "BLOCK", "LABEL", "FOR_IN", "CALL", "NEW_WITH_ARGS", "INDEX",
"ARRAY_INIT", "OBJECT_INIT", "PROPERTY_INIT", "GETTER", "SETTER",
"GROUP", "LIST", "LET_BLOCK", "ARRAY_COMP", "GENERATOR", "COMP_TAIL",
// Terminals.
"IDENTIFIER", "NUMBER", "STRING", "REGEXP",
// Keywords.
"break",
"case", "catch", "const", "continue",
"debugger", "default", "delete", "do",
"else", "export",
"false", "finally", "for", "function",
"if", "import", "in", "instanceof",
"let", "module",
"new", "null",
"return",
"switch",
"this", "throw", "true", "try", "typeof",
"var", "void",
"yield",
"while", "with",
];
var statementStartTokens = [
"break",
"const", "continue",
"debugger", "do",
"for",
"if",
"return",
"switch",
"throw", "try",
"var",
"yield",
"while", "with",
];
// Whitespace characters (see ECMA-262 7.2)
var whitespaceChars = [
// normal whitespace:
"\u0009", "\u000B", "\u000C", "\u0020", "\u00A0", "\uFEFF",
// high-Unicode whitespace:
"\u1680", "\u180E",
"\u2000", "\u2001", "\u2002", "\u2003", "\u2004", "\u2005", "\u2006",
"\u2007", "\u2008", "\u2009", "\u200A",
"\u202F", "\u205F", "\u3000"
];
var whitespace = {};
for (var i = 0; i < whitespaceChars.length; i++) {
whitespace[whitespaceChars[i]] = true;
}
// Operator and punctuator mapping from token to tree node type name.
// NB: because the lexer doesn't backtrack, all token prefixes must themselves
// be valid tokens (e.g. !== is acceptable because its prefixes are the valid
// tokens != and !).
var opTypeNames = {
'\n': "NEWLINE",
';': "SEMICOLON",
',': "COMMA",
'?': "HOOK",
':': "COLON",
'||': "OR",
'&&': "AND",
'|': "BITWISE_OR",
'^': "BITWISE_XOR",
'&': "BITWISE_AND",
'===': "STRICT_EQ",
'==': "EQ",
'=': "ASSIGN",
'!==': "STRICT_NE",
'!=': "NE",
'<<': "LSH",
'<=': "LE",
'<': "LT",
'>>>': "URSH",
'>>': "RSH",
'>=': "GE",
'>': "GT",
'++': "INCREMENT",
'--': "DECREMENT",
'+': "PLUS",
'-': "MINUS",
'*': "MUL",
'/': "DIV",
'%': "MOD",
'!': "NOT",
'~': "BITWISE_NOT",
'.': "DOT",
'[': "LEFT_BRACKET",
']': "RIGHT_BRACKET",
'{': "LEFT_CURLY",
'}': "RIGHT_CURLY",
'(': "LEFT_PAREN",
')': "RIGHT_PAREN"
};
// Hash of keyword identifier to tokens index. NB: we must null __proto__ to
// avoid toString, etc. namespace pollution.
var keywords = Object.create(null);
// Define const END, etc., based on the token names. Also map name to index.
var tokenIds = {};
// Building up a string to be eval'd in different contexts.
var consts = Narcissus.hostSupportsEvalConst ? "const " : "var ";
for (var i = 0, j = tokens.length; i < j; i++) {
if (i > 0)
consts += ", ";
var t = tokens[i];
var name;
if (/^[a-z]/.test(t)) {
name = t.toUpperCase();
keywords[t] = i;
} else {
name = (/^\W/.test(t) ? opTypeNames[t] : t);
}
consts += name + " = " + i;
tokenIds[name] = i;
tokens[t] = i;
}
consts += ";";
var isStatementStartCode = Object.create(null);
for (i = 0, j = statementStartTokens.length; i < j; i++)
isStatementStartCode[keywords[statementStartTokens[i]]] = true;
// Map assignment operators to their indexes in the tokens array.
var assignOps = ['|', '^', '&', '<<', '>>', '>>>', '+', '-', '*', '/', '%'];
for (i = 0, j = assignOps.length; i < j; i++) {
t = assignOps[i];
assignOps[t] = tokens[t];
}
function defineGetter(obj, prop, fn, dontDelete, dontEnum) {
Object.defineProperty(obj, prop,
{ get: fn, configurable: !dontDelete, enumerable: !dontEnum });
}
function defineGetterSetter(obj, prop, getter, setter, dontDelete, dontEnum) {
Object.defineProperty(obj, prop, {
get: getter,
set: setter,
configurable: !dontDelete,
enumerable: !dontEnum
});
}
function defineMemoGetter(obj, prop, fn, dontDelete, dontEnum) {
Object.defineProperty(obj, prop, {
get: function() {
var val = fn();
defineProperty(obj, prop, val, dontDelete, true, dontEnum);
return val;
},
configurable: true,
enumerable: !dontEnum
});
}
function defineProperty(obj, prop, val, dontDelete, readOnly, dontEnum) {
Object.defineProperty(obj, prop,
{ value: val, writable: !readOnly, configurable: !dontDelete,
enumerable: !dontEnum });
}
// Returns true if fn is a native function. (Note: SpiderMonkey specific.)
function isNativeCode(fn) {
// Relies on the toString method to identify native code.
return ((typeof fn) === "function") && fn.toString().match(/\[native code\]/);
}
var Fpapply = Function.prototype.apply;
function apply(f, o, a) {
return Fpapply.call(f, [o].concat(a));
}
var applyNew;
// ES5's bind is a simpler way to implement applyNew
if (Function.prototype.bind) {
applyNew = function applyNew(f, a) {
return new (f.bind.apply(f, [,].concat(a)))();
};
} else {
applyNew = function applyNew(f, a) {
switch (a.length) {
case 0:
return new f();
case 1:
return new f(a[0]);
case 2:
return new f(a[0], a[1]);
case 3:
return new f(a[0], a[1], a[2]);
default:
var argStr = "a[0]";
for (var i = 1, n = a.length; i < n; i++)
argStr += ",a[" + i + "]";
return eval("new f(" + argStr + ")");
}
};
}
function getPropertyDescriptor(obj, name) {
while (obj) {
if (({}).hasOwnProperty.call(obj, name))
return Object.getOwnPropertyDescriptor(obj, name);
obj = Object.getPrototypeOf(obj);
}
}
function getPropertyNames(obj) {
var table = Object.create(null, {});
while (obj) {
var names = Object.getOwnPropertyNames(obj);
for (var i = 0, n = names.length; i < n; i++)
table[names[i]] = true;
obj = Object.getPrototypeOf(obj);
}
return Object.keys(table);
}
function getOwnProperties(obj) {
var map = {};
for (var name in Object.getOwnPropertyNames(obj))
map[name] = Object.getOwnPropertyDescriptor(obj, name);
return map;
}
function blacklistHandler(target, blacklist) {
var mask = Object.create(null, {});
var redirect = Dict.create(blacklist).mapObject(function(name) { return mask; });
return mixinHandler(redirect, target);
}
function whitelistHandler(target, whitelist) {
var catchall = Object.create(null, {});
var redirect = Dict.create(whitelist).mapObject(function(name) { return target; });
return mixinHandler(redirect, catchall);
}
function mirrorHandler(target, writable) {
var handler = makePassthruHandler(target);
var defineProperty = handler.defineProperty;
handler.defineProperty = function(name, desc) {
if (!desc.enumerable)
throw new Error("mirror property must be enumerable");
if (!desc.configurable)
throw new Error("mirror property must be configurable");
if (desc.writable !== writable)
throw new Error("mirror property must " + (writable ? "" : "not ") + "be writable");
defineProperty(name, desc);
};
handler.fix = function() { };
handler.getOwnPropertyDescriptor = handler.getPropertyDescriptor;
handler.getOwnPropertyNames = getPropertyNames.bind(handler, target);
handler.keys = handler.enumerate;
handler["delete"] = function() { return false; };
handler.hasOwn = handler.has;
return handler;
}
/*
* Mixin proxies break the single-inheritance model of prototypes, so
* the handler treats all properties as own-properties:
*
* X
* |
* +------------+------------+
* | O |
* | | |
* | O O O |
* | | | | |
* | O O O O |
* | | | | | |
* | O O O O O |
* | | | | | | |
* +-(*)--(w)--(x)--(y)--(z)-+
*/
function mixinHandler(redirect, catchall) {
function targetFor(name) {
return hasOwn(redirect, name) ? redirect[name] : catchall;
}
function getMuxPropertyDescriptor(name) {
var desc = getPropertyDescriptor(targetFor(name), name);
if (desc)
desc.configurable = true;
return desc;
}
function getMuxPropertyNames() {
var names1 = Object.getOwnPropertyNames(redirect).filter(function(name) {
return name in redirect[name];
});
var names2 = getPropertyNames(catchall).filter(function(name) {
return !hasOwn(redirect, name);
});
return names1.concat(names2);
}
function enumerateMux() {
var result = Object.getOwnPropertyNames(redirect).filter(function(name) {
return name in redirect[name];
});
for (name in catchall) {
if (!hasOwn(redirect, name))
result.push(name);
};
return result;
}
function hasMux(name) {
return name in targetFor(name);
}
return {
getOwnPropertyDescriptor: getMuxPropertyDescriptor,
getPropertyDescriptor: getMuxPropertyDescriptor,
getOwnPropertyNames: getMuxPropertyNames,
defineProperty: function(name, desc) {
Object.defineProperty(targetFor(name), name, desc);
},
"delete": function(name) {
var target = targetFor(name);
return delete target[name];
},
// FIXME: ha ha ha
fix: function() { },
has: hasMux,
hasOwn: hasMux,
get: function(receiver, name) {
var target = targetFor(name);
return target[name];
},
set: function(receiver, name, val) {
var target = targetFor(name);
target[name] = val;
return true;
},
enumerate: enumerateMux,
keys: enumerateMux
};
}
function makePassthruHandler(obj) {
// Handler copied from
// http://wiki.ecmascript.org/doku.php?id=harmony:proxies&s=proxy%20object#examplea_no-op_forwarding_proxy
return {
getOwnPropertyDescriptor: function(name) {
var desc = Object.getOwnPropertyDescriptor(obj, name);
// a trapping proxy's properties must always be configurable
desc.configurable = true;
return desc;
},
getPropertyDescriptor: function(name) {
var desc = getPropertyDescriptor(obj, name);
// a trapping proxy's properties must always be configurable
desc.configurable = true;
return desc;
},
getOwnPropertyNames: function() {
return Object.getOwnPropertyNames(obj);
},
defineProperty: function(name, desc) {
Object.defineProperty(obj, name, desc);
},
"delete": function(name) { return delete obj[name]; },
fix: function() {
if (Object.isFrozen(obj)) {
return getOwnProperties(obj);
}
// As long as obj is not frozen, the proxy won't allow itself to be fixed.
return undefined; // will cause a TypeError to be thrown
},
has: function(name) { return name in obj; },
hasOwn: function(name) { return ({}).hasOwnProperty.call(obj, name); },
get: function(receiver, name) { return obj[name]; },
// bad behavior when set fails in non-strict mode
set: function(receiver, name, val) { obj[name] = val; return true; },
enumerate: function() {
var result = [];
for (name in obj) { result.push(name); };
return result;
},
keys: function() { return Object.keys(obj); }
};
}
var hasOwnProperty = ({}).hasOwnProperty;
function hasOwn(obj, name) {
return hasOwnProperty.call(obj, name);
}
function Dict(table, size) {
this.table = table || Object.create(null, {});
this.size = size || 0;
}
Dict.create = function(table) {
var init = Object.create(null, {});
var size = 0;
var names = Object.getOwnPropertyNames(table);
for (var i = 0, n = names.length; i < n; i++) {
var name = names[i];
init[name] = table[name];
size++;
}
return new Dict(init, size);
};
Dict.prototype = {
has: function(x) { return hasOwnProperty.call(this.table, x); },
set: function(x, v) {
if (!hasOwnProperty.call(this.table, x))
this.size++;
this.table[x] = v;
},
get: function(x) { return this.table[x]; },
getDef: function(x, thunk) {
if (!hasOwnProperty.call(this.table, x)) {
this.size++;
this.table[x] = thunk();
}
return this.table[x];
},
forEach: function(f) {
var table = this.table;
for (var key in table)
f.call(this, key, table[key]);
},
map: function(f) {
var table1 = this.table;
var table2 = Object.create(null, {});
this.forEach(function(key, val) {
table2[key] = f.call(this, val, key);
});
return new Dict(table2, this.size);
},
mapObject: function(f) {
var table1 = this.table;
var table2 = Object.create(null, {});
this.forEach(function(key, val) {
table2[key] = f.call(this, val, key);
});
return table2;
},
toObject: function() {
return this.mapObject(function(val) { return val; });
},
choose: function() {
return Object.getOwnPropertyNames(this.table)[0];
},
remove: function(x) {
if (hasOwnProperty.call(this.table, x)) {
this.size--;
delete this.table[x];
}
},
copy: function() {
var table = Object.create(null, {});
for (var key in this.table)
table[key] = this.table[key];
return new Dict(table, this.size);
},
keys: function() {
return Object.keys(this.table);
},
toString: function() { return "[object Dict]" }
};
// shim for ES6 WeakMap with poor asymptotics
function WeakMap(array) {
this.array = array || [];
}
function searchMap(map, key, found, notFound) {
var a = map.array;
for (var i = 0, n = a.length; i < n; i++) {
var pair = a[i];
if (pair.key === key)
return found(pair, i);
}
return notFound();
}
WeakMap.prototype = {
has: function(x) {
return searchMap(this, x, function() { return true }, function() { return false });
},
set: function(x, v) {
var a = this.array;
searchMap(this, x,
function(pair) { pair.value = v },
function() { a.push({ key: x, value: v }) });
},
get: function(x) {
return searchMap(this, x,
function(pair) { return pair.value },
function() { return null });
},
"delete": function(x) {
var a = this.array;
searchMap(this, x,
function(pair, i) { a.splice(i, 1) },
function() { });
},
toString: function() { return "[object WeakMap]" }
};
// non-destructive stack
function Stack(elts) {
this.elts = elts || null;
}
Stack.prototype = {
push: function(x) {
return new Stack({ top: x, rest: this.elts });
},
top: function() {
if (!this.elts)
throw new Error("empty stack");
return this.elts.top;
},
isEmpty: function() {
return this.top === null;
},
find: function(test) {
for (var elts = this.elts; elts; elts = elts.rest) {
if (test(elts.top))
return elts.top;
}
return null;
},
has: function(x) {
return Boolean(this.find(function(elt) { return elt === x }));
},
forEach: function(f) {
for (var elts = this.elts; elts; elts = elts.rest) {
f(elts.top);
}
}
};
if (!Array.prototype.copy) {
defineProperty(Array.prototype, "copy",
function() {
var result = [];
for (var i = 0, n = this.length; i < n; i++)
result[i] = this[i];
return result;
}, false, false, true);
}
if (!Array.prototype.top) {
defineProperty(Array.prototype, "top",
function() {
return this.length && this[this.length-1];
}, false, false, true);