/*!
 * https://github.com/es-shims/es5-shim
 * @license es5-shim Copyright 2009-2015 by contributors, MIT License
 * see https://github.com/es-shims/es5-shim/blob/master/LICENSE
 */

// vim: ts=4 sts=4 sw=4 expandtab

// Add semicolon to prevent IIFE from being passed as argument to concatenated code.
;

// UMD (Universal Module Definition)
// see https://github.com/umdjs/umd/blob/master/templates/returnExports.js
(function (root, factory) {
    'use strict';

    /* global define, exports, module */
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define(factory);
    } else if (typeof exports === 'object') {
        // Node. Does not work with strict CommonJS, but
        // only CommonJS-like enviroments that support module.exports,
        // like Node.
        module.exports = factory();
    } else {
        // Browser globals (root is window)
        root.returnExports = factory();
  }
}(this, function () {

var call = Function.call;
var prototypeOfObject = Object.prototype;
var owns = call.bind(prototypeOfObject.hasOwnProperty);
var isEnumerable = call.bind(prototypeOfObject.propertyIsEnumerable);
var toStr = call.bind(prototypeOfObject.toString);

// If JS engine supports accessors creating shortcuts.
var defineGetter;
var defineSetter;
var lookupGetter;
var lookupSetter;
var supportsAccessors = owns(prototypeOfObject, '__defineGetter__');
if (supportsAccessors) {
    /* eslint-disable no-underscore-dangle */
    defineGetter = call.bind(prototypeOfObject.__defineGetter__);
    defineSetter = call.bind(prototypeOfObject.__defineSetter__);
    lookupGetter = call.bind(prototypeOfObject.__lookupGetter__);
    lookupSetter = call.bind(prototypeOfObject.__lookupSetter__);
    /* eslint-enable no-underscore-dangle */
}

// ES5 15.2.3.2
// http://es5.github.com/#x15.2.3.2
if (!Object.getPrototypeOf) {
    // https://github.com/es-shims/es5-shim/issues#issue/2
    // http://ejohn.org/blog/objectgetprototypeof/
    // recommended by fschaefer on github
    //
    // sure, and webreflection says ^_^
    // ... this will nerever possibly return null
    // ... Opera Mini breaks here with infinite loops
    Object.getPrototypeOf = function getPrototypeOf(object) {
        /* eslint-disable no-proto */
        var proto = object.__proto__;
        /* eslint-enable no-proto */
        if (proto || proto === null) {
            return proto;
        } else if (toStr(object.constructor) === '[object Function]') {
            return object.constructor.prototype;
        } else if (object instanceof Object) {
          return prototypeOfObject;
        } else {
          // Correctly return null for Objects created with `Object.create(null)`
          // (shammed or native) or `{ __proto__: null}`.  Also returns null for
          // cross-realm objects on browsers that lack `__proto__` support (like
          // IE <11), but that's the best we can do.
          return null;
        }
    };
}

// ES5 15.2.3.3
// http://es5.github.com/#x15.2.3.3

var doesGetOwnPropertyDescriptorWork = function doesGetOwnPropertyDescriptorWork(object) {
    try {
        object.sentinel = 0;
        return Object.getOwnPropertyDescriptor(object, 'sentinel').value === 0;
    } catch (exception) {
        return false;
    }
};

// check whether getOwnPropertyDescriptor works if it's given. Otherwise, shim partially.
if (Object.defineProperty) {
    var getOwnPropertyDescriptorWorksOnObject = doesGetOwnPropertyDescriptorWork({});
    var getOwnPropertyDescriptorWorksOnDom = typeof document === 'undefined' ||
    doesGetOwnPropertyDescriptorWork(document.createElement('div'));
    if (!getOwnPropertyDescriptorWorksOnDom || !getOwnPropertyDescriptorWorksOnObject) {
        var getOwnPropertyDescriptorFallback = Object.getOwnPropertyDescriptor;
    }
}

if (!Object.getOwnPropertyDescriptor || getOwnPropertyDescriptorFallback) {
    var ERR_NON_OBJECT = 'Object.getOwnPropertyDescriptor called on a non-object: ';

    /* eslint-disable no-proto */
    Object.getOwnPropertyDescriptor = function getOwnPropertyDescriptor(object, property) {
        if ((typeof object !== 'object' && typeof object !== 'function') || object === null) {
            throw new TypeError(ERR_NON_OBJECT + object);
        }

        // make a valiant attempt to use the real getOwnPropertyDescriptor
        // for I8's DOM elements.
        if (getOwnPropertyDescriptorFallback) {
            try {
                return getOwnPropertyDescriptorFallback.call(Object, object, property);
            } catch (exception) {
                // try the shim if the real one doesn't work
            }
        }

        var descriptor;

        // If object does not owns property return undefined immediately.
        if (!owns(object, property)) {
            return descriptor;
        }

        // If object has a property then it's for sure `configurable`, and
        // probably `enumerable`. Detect enumerability though.
        descriptor = {
            enumerable: isEnumerable(object, property),
            configurable: true
        };

        // If JS engine supports accessor properties then property may be a
        // getter or setter.
        if (supportsAccessors) {
            // Unfortunately `__lookupGetter__` will return a getter even
            // if object has own non getter property along with a same named
            // inherited getter. To avoid misbehavior we temporary remove
            // `__proto__` so that `__lookupGetter__` will return getter only
            // if it's owned by an object.
            var prototype = object.__proto__;
            var notPrototypeOfObject = object !== prototypeOfObject;
            // avoid recursion problem, breaking in Opera Mini when
            // Object.getOwnPropertyDescriptor(Object.prototype, 'toString')
            // or any other Object.prototype accessor
            if (notPrototypeOfObject) {
                object.__proto__ = prototypeOfObject;
            }

            var getter = lookupGetter(object, property);
            var setter = lookupSetter(object, property);

            if (notPrototypeOfObject) {
                // Once we have getter and setter we can put values back.
                object.__proto__ = prototype;
            }

            if (getter || setter) {
                if (getter) {
                    descriptor.get = getter;
                }
                if (setter) {
                    descriptor.set = setter;
                }
                // If it was accessor property we're done and return here
                // in order to avoid adding `value` to the descriptor.
                return descriptor;
            }
        }

        // If we got this far we know that object has an own property that is
        // not an accessor so we set it as a value and return descriptor.
        descriptor.value = object[property];
        descriptor.writable = true;
        return descriptor;
    };
    /* eslint-enable no-proto */
}

// ES5 15.2.3.4
// http://es5.github.com/#x15.2.3.4
if (!Object.getOwnPropertyNames) {
    Object.getOwnPropertyNames = function getOwnPropertyNames(object) {
        return Object.keys(object);
    };
}

// ES5 15.2.3.5
// http://es5.github.com/#x15.2.3.5
if (!Object.create) {

    // Contributed by Brandon Benvie, October, 2012
    var createEmpty;
    var supportsProto = !({ __proto__: null } instanceof Object);
                        // the following produces false positives
                        // in Opera Mini => not a reliable check
                        // Object.prototype.__proto__ === null

    // Check for document.domain and active x support
    // No need to use active x approach when document.domain is not set
    // see https://github.com/es-shims/es5-shim/issues/150
    // variation of https://github.com/kitcambridge/es5-shim/commit/4f738ac066346
    /* global ActiveXObject */
    var shouldUseActiveX = function shouldUseActiveX() {
        // return early if document.domain not set
        if (!document.domain) {
            return false;
        }

        try {
            return !!new ActiveXObject('htmlfile');
        } catch (exception) {
            return false;
        }
    };

    // This supports IE8 when document.domain is used
    // see https://github.com/es-shims/es5-shim/issues/150
    // variation of https://github.com/kitcambridge/es5-shim/commit/4f738ac066346
    var getEmptyViaActiveX = function getEmptyViaActiveX() {
        var empty;
        var xDoc;

        xDoc = new ActiveXObject('htmlfile');

        xDoc.write('<script><\/script>');
        xDoc.close();

        empty = xDoc.parentWindow.Object.prototype;
        xDoc = null;

        return empty;
    };

    // The original implementation using an iframe
    // before the activex approach was added
    // see https://github.com/es-shims/es5-shim/issues/150
    var getEmptyViaIFrame = function getEmptyViaIFrame() {
        var iframe = document.createElement('iframe');
        var parent = document.body || document.documentElement;
        var empty;

        iframe.style.display = 'none';
        parent.appendChild(iframe);
        /* eslint-disable no-script-url */
        iframe.src = 'javascript:';
        /* eslint-enable no-script-url */

        empty = iframe.contentWindow.Object.prototype;
        parent.removeChild(iframe);
        iframe = null;

        return empty;
    };

    /* global document */
    if (supportsProto || typeof document === 'undefined') {
        createEmpty = function () {
            return { __proto__: null };
        };
    } else {
        // In old IE __proto__ can't be used to manually set `null`, nor does
        // any other method exist to make an object that inherits from nothing,
        // aside from Object.prototype itself. Instead, create a new global
        // object and *steal* its Object.prototype and strip it bare. This is
        // used as the prototype to create nullary objects.
        createEmpty = function () {
            // Determine which approach to use
            // see https://github.com/es-shims/es5-shim/issues/150
            var empty = shouldUseActiveX() ? getEmptyViaActiveX() : getEmptyViaIFrame();

            delete empty.constructor;
            delete empty.hasOwnProperty;
            delete empty.propertyIsEnumerable;
            delete empty.isPrototypeOf;
            delete empty.toLocaleString;
            delete empty.toString;
            delete empty.valueOf;

            var Empty = function Empty() {};
            Empty.prototype = empty;
            // short-circuit future calls
            createEmpty = function () {
                return new Empty();
            };
            return new Empty();
        };
    }

    Object.create = function create(prototype, properties) {

        var object;
        var Type = function Type() {}; // An empty constructor.

        if (prototype === null) {
            object = createEmpty();
        } else {
            if (typeof prototype !== 'object' && typeof prototype !== 'function') {
                // In the native implementation `parent` can be `null`
                // OR *any* `instanceof Object`  (Object|Function|Array|RegExp|etc)
                // Use `typeof` tho, b/c in old IE, DOM elements are not `instanceof Object`
                // like they are in modern browsers. Using `Object.create` on DOM elements
                // is...err...probably inappropriate, but the native version allows for it.
                throw new TypeError('Object prototype may only be an Object or null'); // same msg as Chrome
            }
            Type.prototype = prototype;
            object = new Type();
            // IE has no built-in implementation of `Object.getPrototypeOf`
            // neither `__proto__`, but this manually setting `__proto__` will
            // guarantee that `Object.getPrototypeOf` will work as expected with
            // objects created using `Object.create`
            /* eslint-disable no-proto */
            object.__proto__ = prototype;
            /* eslint-enable no-proto */
        }

        if (properties !== void 0) {
            Object.defineProperties(object, properties);
        }

        return object;
    };
}

// ES5 15.2.3.6
// http://es5.github.com/#x15.2.3.6

// Patch for WebKit and IE8 standard mode
// Designed by hax <hax.github.com>
// related issue: https://github.com/es-shims/es5-shim/issues#issue/5
// IE8 Reference:
//     http://msdn.microsoft.com/en-us/library/dd282900.aspx
//     http://msdn.microsoft.com/en-us/library/dd229916.aspx
// WebKit Bugs:
//     https://bugs.webkit.org/show_bug.cgi?id=36423

var doesDefinePropertyWork = function doesDefinePropertyWork(object) {
    try {
        Object.defineProperty(object, 'sentinel', {});
        return 'sentinel' in object;
    } catch (exception) {
        return false;
    }
};

// check whether defineProperty works if it's given. Otherwise,
// shim partially.
if (Object.defineProperty) {
    var definePropertyWorksOnObject = doesDefinePropertyWork({});
    var definePropertyWorksOnDom = typeof document === 'undefined' ||
        doesDefinePropertyWork(document.createElement('div'));
    if (!definePropertyWorksOnObject || !definePropertyWorksOnDom) {
        var definePropertyFallback = Object.defineProperty,
            definePropertiesFallback = Object.defineProperties;
    }
}

if (!Object.defineProperty || definePropertyFallback) {
    var ERR_NON_OBJECT_DESCRIPTOR = 'Property description must be an object: ';
    var ERR_NON_OBJECT_TARGET = 'Object.defineProperty called on non-object: ';
    var ERR_ACCESSORS_NOT_SUPPORTED = 'getters & setters can not be defined on this javascript engine';

    Object.defineProperty = function defineProperty(object, property, descriptor) {
        if ((typeof object !== 'object' && typeof object !== 'function') || object === null) {
            throw new TypeError(ERR_NON_OBJECT_TARGET + object);
        }
        if ((typeof descriptor !== 'object' && typeof descriptor !== 'function') || descriptor === null) {
            throw new TypeError(ERR_NON_OBJECT_DESCRIPTOR + descriptor);
        }
        // make a valiant attempt to use the real defineProperty
        // for I8's DOM elements.
        if (definePropertyFallback) {
            try {
                return definePropertyFallback.call(Object, object, property, descriptor);
            } catch (exception) {
                // try the shim if the real one doesn't work
            }
        }

        // If it's a data property.
        if ('value' in descriptor) {
            // fail silently if 'writable', 'enumerable', or 'configurable'
            // are requested but not supported
            /*
            // alternate approach:
            if ( // can't implement these features; allow false but not true
                ('writable' in descriptor && !descriptor.writable) ||
                ('enumerable' in descriptor && !descriptor.enumerable) ||
                ('configurable' in descriptor && !descriptor.configurable)
            ))
                throw new RangeError(
                    'This implementation of Object.defineProperty does not support configurable, enumerable, or writable.'
                );
            */

            if (supportsAccessors && (lookupGetter(object, property) || lookupSetter(object, property))) {
                // As accessors are supported only on engines implementing
                // `__proto__` we can safely override `__proto__` while defining
                // a property to make sure that we don't hit an inherited
                // accessor.
                /* eslint-disable no-proto */
                var prototype = object.__proto__;
                object.__proto__ = prototypeOfObject;
                // Deleting a property anyway since getter / setter may be
                // defined on object itself.
                delete object[property];
                object[property] = descriptor.value;
                // Setting original `__proto__` back now.
                object.__proto__ = prototype;
                /* eslint-enable no-proto */
            } else {
                object[property] = descriptor.value;
            }
        } else {
            if (!supportsAccessors && (('get' in descriptor) || ('set' in descriptor))) {
                throw new TypeError(ERR_ACCESSORS_NOT_SUPPORTED);
            }
            // If we got that far then getters and setters can be defined !!
            if ('get' in descriptor) {
                defineGetter(object, property, descriptor.get);
            }
            if ('set' in descriptor) {
                defineSetter(object, property, descriptor.set);
            }
        }
        return object;
    };
}

// ES5 15.2.3.7
// http://es5.github.com/#x15.2.3.7
if (!Object.defineProperties || definePropertiesFallback) {
    Object.defineProperties = function defineProperties(object, properties) {
        // make a valiant attempt to use the real defineProperties
        if (definePropertiesFallback) {
            try {
                return definePropertiesFallback.call(Object, object, properties);
            } catch (exception) {
                // try the shim if the real one doesn't work
            }
        }

        Object.keys(properties).forEach(function (property) {
            if (property !== '__proto__') {
                Object.defineProperty(object, property, properties[property]);
            }
        });
        return object;
    };
}

// ES5 15.2.3.8
// http://es5.github.com/#x15.2.3.8
if (!Object.seal) {
    Object.seal = function seal(object) {
        if (Object(object) !== object) {
            throw new TypeError('Object.seal can only be called on Objects.');
        }
        // this is misleading and breaks feature-detection, but
        // allows "securable" code to "gracefully" degrade to working
        // but insecure code.
        return object;
    };
}

// ES5 15.2.3.9
// http://es5.github.com/#x15.2.3.9
if (!Object.freeze) {
    Object.freeze = function freeze(object) {
        if (Object(object) !== object) {
            throw new TypeError('Object.freeze can only be called on Objects.');
        }
        // this is misleading and breaks feature-detection, but
        // allows "securable" code to "gracefully" degrade to working
        // but insecure code.
        return object;
    };
}

// detect a Rhino bug and patch it
try {
    Object.freeze(function () {});
} catch (exception) {
    Object.freeze = (function (freezeObject) {
        return function freeze(object) {
            if (typeof object === 'function') {
                return object;
            } else {
                return freezeObject(object);
            }
        };
    }(Object.freeze));
}

// ES5 15.2.3.10
// http://es5.github.com/#x15.2.3.10
if (!Object.preventExtensions) {
    Object.preventExtensions = function preventExtensions(object) {
        if (Object(object) !== object) {
            throw new TypeError('Object.preventExtensions can only be called on Objects.');
        }
        // this is misleading and breaks feature-detection, but
        // allows "securable" code to "gracefully" degrade to working
        // but insecure code.
        return object;
    };
}

// ES5 15.2.3.11
// http://es5.github.com/#x15.2.3.11
if (!Object.isSealed) {
    Object.isSealed = function isSealed(object) {
        if (Object(object) !== object) {
            throw new TypeError('Object.isSealed can only be called on Objects.');
        }
        return false;
    };
}

// ES5 15.2.3.12
// http://es5.github.com/#x15.2.3.12
if (!Object.isFrozen) {
    Object.isFrozen = function isFrozen(object) {
        if (Object(object) !== object) {
            throw new TypeError('Object.isFrozen can only be called on Objects.');
        }
        return false;
    };
}

// ES5 15.2.3.13
// http://es5.github.com/#x15.2.3.13
if (!Object.isExtensible) {
    Object.isExtensible = function isExtensible(object) {
        // 1. If Type(O) is not Object throw a TypeError exception.
        if (Object(object) !== object) {
            throw new TypeError('Object.isExtensible can only be called on Objects.');
        }
        // 2. Return the Boolean value of the [[Extensible]] internal property of O.
        var name = '';
        while (owns(object, name)) {
            name += '?';
        }
        object[name] = true;
        var returnValue = owns(object, name);
        delete object[name];
        return returnValue;
    };
}

}));
