/
amplify.store.js
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/
amplify.store.js
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/*!
* Amplify Store - Persistent Client-Side Storage @VERSION
*
* Copyright 2011 appendTo LLC. (http://appendto.com/team)
* Dual licensed under the MIT or GPL licenses.
* http://appendto.com/open-source-licenses
*
* http://amplifyjs.com
*/
(function( amplify, undefined ) {
// MooTools Compatibility
JSON.stringify = JSON.stringify||JSON.encode;
JSON.parse = JSON.parse||JSON.decode;
var store = amplify.store = function( key, value, options, type ) {
var type = store.type;
if ( options && options.type && options.type in store.types ) {
type = options.type;
}
return store.types[ type ]( key, value, options || {} );
};
store.types = {};
store.type = null;
store.addType = function( type, storage ) {
if ( !store.type ) {
store.type = type;
}
store.types[ type ] = storage;
store[ type ] = function( key, value, options ) {
options = options || {};
options.type = type;
return store( key, value, options );
};
}
store.error = function() {
return "amplify.store quota exceeded";
};
function createSimpleStorage( storageType, storage ) {
var values = storage.__amplify__ ? JSON.parse( storage.__amplify__ ) : {};
store.addType( storageType, function( key, value, options ) {
var ret = value,
now = (new Date()).getTime(),
storedValue,
parsed;
if ( !key ) {
ret = {};
for ( key in values ) {
storedValue = storage[ key ];
parsed = storedValue ? JSON.parse( storedValue ) : { expires: -1 };
if ( parsed.expires && parsed.expires <= now ) {
delete storage[ key ];
delete values[ key ];
} else {
ret[ key.replace( /^__amplify__/, "" ) ] = parsed.data;
}
}
storage.__amplify__ = JSON.stringify( values );
return ret;
}
// protect against overwriting built-in properties
key = "__amplify__" + key;
if ( value === undefined ) {
if ( values[ key ] ) {
storedValue = storage[ key ];
parsed = storedValue ? JSON.parse( storedValue ) : { expires: -1 };
if ( parsed.expires && parsed.expires <= now ) {
delete storage[ key ];
delete values[ key ];
} else {
return parsed.data;
}
}
} else {
if ( value === null ) {
delete storage[ key ];
delete values[ key ];
} else {
parsed = JSON.stringify({
data: value,
expires: options.expires ? now + options.expires : null
});
try {
storage[ key ] = parsed;
values[ key ] = true;
// quota exceeded
} catch( error ) {
// expire old data and try again
store[ storageType ]();
try {
storage[ key ] = parsed;
values[ key ] = true;
} catch( error ) {
throw store.error();
}
}
}
}
storage.__amplify__ = JSON.stringify( values );
return ret;
});
}
// localStorage + sessionStorage
// IE 8+, Firefox 3.5+, Safari 4+, Chrome 4+, Opera 10.5+, iPhone 2+, Android 2+
for ( var webStorageType in { localStorage: 1, sessionStorage: 1 } ) {
// try/catch for file protocol in Firefox
try {
if ( window[ webStorageType ].getItem ) {
createSimpleStorage( webStorageType, window[ webStorageType ] );
}
} catch( e ) {}
}
// globalStorage
// non-standard: Firefox 2+
// https://developer.mozilla.org/en/dom/storage#globalStorage
if ( window.globalStorage ) {
createSimpleStorage( "globalStorage",
window.globalStorage[ window.location.hostname ] );
// Firefox 2.0 and 3.0 have sessionStorage and globalStorage
// make sure we defualt to globalStorage
// but don't default to globalStorage in 3.5+ which also has localStorage
if ( store.type === "sessionStorage" ) {
store.type = "globalStorage";
}
}
// userData
// non-standard: IE 5+
// http://msdn.microsoft.com/en-us/library/ms531424(v=vs.85).aspx
(function() {
// append to html instead of body so we can do this from the head
var div = document.createElement( "div" ),
attrKey = "amplify",
attrs;
div.style.display = "none";
document.getElementsByTagName( "head" )[ 0 ].appendChild( div );
if ( div.addBehavior ) {
div.addBehavior( "#default#userdata" );
div.load( attrKey );
attrs = div.getAttribute( attrKey ) ? JSON.parse( div.getAttribute( attrKey ) ) : {};
store.addType( "userData", function( key, value, options ) {
var ret = value,
now = (new Date()).getTime(),
attr,
parsed,
prevValue;
if ( !key ) {
ret = {};
for ( key in attrs ) {
attr = div.getAttribute( key );
parsed = attr ? JSON.parse( attr ) : { expires: -1 };
if ( parsed.expires && parsed.expires <= now ) {
div.removeAttribute( key );
delete attrs[ key ];
} else {
ret[ key ] = parsed.data;
}
}
div.setAttribute( attrKey, JSON.stringify( attrs ) );
div.save( attrKey );
return ret;
}
// convert invalid characters to dashes
// http://www.w3.org/TR/REC-xml/#NT-Name
// simplified to assume the starting character is valid
// also removed colon as it is invalid in HTML attribute names
key = key.replace( /[^-._0-9A-Za-z\xb7\xc0-\xd6\xd8-\xf6\xf8-\u037d\u37f-\u1fff\u200c-\u200d\u203f\u2040\u2070-\u218f]/g, "-" );
if ( value === undefined ) {
if ( key in attrs ) {
attr = div.getAttribute( key );
parsed = attr ? JSON.parse( attr ) : { expires: -1 };
if ( parsed.expires && parsed.expires <= now ) {
div.removeAttribute( key );
delete attrs[ key ];
} else {
return parsed.data;
}
}
} else {
if ( value === null ) {
div.removeAttribute( key );
delete attrs[ key ];
} else {
// we need to get the previous value in case we need to rollback
prevValue = div.getAttribute( key );
parsed = JSON.stringify({
data: value,
expires: (options.expires ? (now + options.expires) : null)
});
div.setAttribute( key, parsed );
attrs[ key ] = true;
}
}
div.setAttribute( attrKey, JSON.stringify( attrs ) );
try {
div.save( attrKey );
// quota exceeded
} catch ( error ) {
// roll the value back to the previous value
if ( prevValue === null ) {
div.removeAttribute( key );
delete attrs[ key ];
} else {
div.setAttribute( key, prevValue );
}
// expire old data and try again
store.userData();
try {
div.setAttribute( key, parsed );
attrs[ key ] = true;
div.save( attrKey );
} catch ( error ) {
// roll the value back to the previous value
if ( prevValue === null ) {
div.removeAttribute( key );
delete attrs[ key ];
} else {
div.setAttribute( key, prevValue );
}
throw store.error();
}
}
return ret;
});
}
}() );
// in-memory storage
// fallback for all browsers to enable the API even if we can't persist data
createSimpleStorage( "memory", {} );
}( this.amplify = this.amplify || {} ) );