forked from marcuswestin/store.js
/
store.js
152 lines (146 loc) · 5.32 KB
/
store.js
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;(function(win){
var store = {},
doc = win.document,
localStorageName = 'localStorage',
namespace = '__storejs__',
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.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 = {}
for (var i=0; i<storage.length; ++i) {
var key = storage.key(i)
ret[key] = store.get(key)
}
return ret
}
} 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('<s' + 'cript>document.w=window</s' + 'cript><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 may not contain special chars. See all of https://github.com/marcuswestin/store.js/issues/40
var forbiddenCharsRegex = new RegExp("[!\"#$%&'()*+,/\\\\:;<=>?@[\\]^`{|}~]", "g")
function ieKeyFix(key) {
return key.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 = withIEStorage(function(storage) {
var attributes = storage.XMLDocument.documentElement.attributes
var ret = {}
for (var i=0, attr; attr=attributes[i]; ++i) {
var key = ieKeyFix(attr.name)
ret[attr.name] = store.deserialize(storage.getAttribute(key))
}
return ret
})
}
try {
store.set(namespace, namespace)
if (store.get(namespace) != namespace) { store.disabled = true }
store.remove(namespace)
} catch(e) {
store.disabled = true
}
store.enabled = !store.disabled
if (typeof module != 'undefined' && module.exports) { module.exports = store }
else if (typeof define === 'function' && define.amd) { define(store) }
else { win.store = store }
})(this.window || global);