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;
(function (win) {
var store = {},
doc = win.document,
localStorageName = 'localStorage',
scriptTag = 'script',
storage;
store.disabled = false;
store.set = function (key, value) {
};
store.get = function (key) {
};
store.remove = function (key) {
};
store.clear = function () {
};
store.transact = function (key, defaultVal, transactionFn) {
var val = store.get(key);
if (transactionFn == null) {
transactionFn = defaultVal;
defaultVal = null
}
if (typeof val == 'undefined') {
val = defaultVal || {}
}
transactionFn(val);
store.set(key, val)
};
store.getAll = function () {
};
store.forEach = function () {
};
store.serialize = function (value) {
return JSON.stringify(value)
};
store.deserialize = function (value) {
if (typeof value != 'string') {
return undefined
}
try {
return JSON.parse(value)
}
catch (e) {
return value || undefined
}
};
// Functions to encapsulate questionable FireFox 3.6.13 behavior
// when about.config::dom.storage.enabled === false
// See https://github.com/marcuswestin/store.js/issues#issue/13
function isLocalStorageNameSupported() {
try {
return (localStorageName in win && win[localStorageName])
}
catch (err) {
return false
}
}
if (isLocalStorageNameSupported()) {
storage = win[localStorageName];
store.set = function (key, val) {
if (val === undefined) {
return store.remove(key)
}
storage.setItem(key, store.serialize(val));
return val
};
store.get = function (key) {
return store.deserialize(storage.getItem(key))
};
store.remove = function (key) {
storage.removeItem(key)
};
store.clear = function () {
storage.clear()
};
store.getAll = function () {
var ret = {};
store.forEach(function (key, val) {
ret[key] = val
});
return ret
};
store.forEach = function (callback) {
for (var i = 0; i < storage.length; i++) {
var key = storage.key(i);
callback(key, store.get(key))
}
}
} else if (doc.documentElement.addBehavior) {
var storageOwner,
storageContainer;
// Since #userData storage applies only to specific paths, we need to
// somehow link our data to a specific path. We choose /favicon.ico
// as a pretty safe option, since all browsers already make a request to
// this URL anyway and being a 404 will not hurt us here. We wrap an
// iframe pointing to the favicon in an ActiveXObject(htmlfile) object
// (see: http://msdn.microsoft.com/en-us/library/aa752574(v=VS.85).aspx)
// since the iframe access rules appear to allow direct access and
// manipulation of the document element, even for a 404 page. This
// document can be used instead of the current document (which would
// have been limited to the current path) to perform #userData storage.
try {
storageContainer = new ActiveXObject('htmlfile');
storageContainer.open();
storageContainer.write('<' + scriptTag + '>document.w=window</' + scriptTag + '><iframe src="/favicon.ico"></iframe>');
storageContainer.close();
storageOwner = storageContainer.w.frames[0].document;
storage = storageOwner.createElement('div')
} catch (e) {
// somehow ActiveXObject instantiation failed (perhaps some special
// security settings or otherwse), fall back to per-path storage
storage = doc.createElement('div');
storageOwner = doc.body
}
function withIEStorage(storeFunction) {
return function () {
var args = Array.prototype.slice.call(arguments, 0);
args.unshift(storage);
// See http://msdn.microsoft.com/en-us/library/ms531081(v=VS.85).aspx
// and http://msdn.microsoft.com/en-us/library/ms531424(v=VS.85).aspx
storageOwner.appendChild(storage);
storage.addBehavior('#default#userData');
storage.load(localStorageName);
var result = storeFunction.apply(store, args);
storageOwner.removeChild(storage);
return result
}
}
// In IE7, keys cannot start with a digit or contain certain chars.
// See https://github.com/marcuswestin/store.js/issues/40
// See https://github.com/marcuswestin/store.js/issues/83
var forbiddenCharsRegex = new RegExp("[!\"#$%&'()*+,/\\\\:;<=>?@[\\]^`{|}~]", "g");
function ieKeyFix(key) {
return key.replace(/^d/, '___$&').replace(forbiddenCharsRegex, '___')
}
store.set = withIEStorage(function (storage, key, val) {
key = ieKeyFix(key);
if (val === undefined) {
return store.remove(key)
}
storage.setAttribute(key, store.serialize(val));
storage.save(localStorageName);
return val
});
store.get = withIEStorage(function (storage, key) {
key = ieKeyFix(key);
return store.deserialize(storage.getAttribute(key))
});
store.remove = withIEStorage(function (storage, key) {
key = ieKeyFix(key);
storage.removeAttribute(key);
storage.save(localStorageName)
});
store.clear = withIEStorage(function (storage) {
var attributes = storage.XMLDocument.documentElement.attributes;
storage.load(localStorageName);
for (var i = 0, attr; attr = attributes[i]; i++) {
storage.removeAttribute(attr.name)
}
storage.save(localStorageName)
});
store.getAll = function (storage) {
var ret = {};
store.forEach(function (key, val) {
ret[key] = val
});
return ret
};
store.forEach = withIEStorage(function (storage, callback) {
var attributes = storage.XMLDocument.documentElement.attributes;
for (var i = 0, attr; attr = attributes[i]; ++i) {
callback(attr.name, store.deserialize(storage.getAttribute(attr.name)))
}
})
}
try {
var testKey = '__storejs__';
store.set(testKey, testKey);
if (store.get(testKey) != testKey) {
store.disabled = true
}
store.remove(testKey)
} catch (e) {
store.disabled = true
}
store.enabled = !store.disabled;
if (typeof module != 'undefined' && module.exports && this.module !== module) {
module.exports = store
}
else if (typeof define === 'function' && define.amd) {
define(store)
}
else {
win.store = store
}
})(Function('return this')());