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Fix #13494: Fallback defineProperties to jQuery.extend. Close gh-1182.

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Android<4 (ancient WebKit) doesn't have full ES5 support.
This commit is contained in:
Richard Gibson 2013-02-23 12:41:37 -05:00 committed by Dave Methvin
parent b55bfb140f
commit 85f1985f24
1 changed files with 26 additions and 34 deletions
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60
src/data.js
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@ -14,44 +14,36 @@ var data_user, data_priv,
rmultiDash = /([A-Z])/g;
function Data() {
// Data objects. Keys correspond to the
// unlocker that is accessible via "locker" method
this.cache = {};
this.expando = jQuery.expando + Math.random();
}
Data.uid = 1;
Data.prototype = {
locker: function( owner ) {
var ovalueOf,
// Check if the owner object has already been outfitted with a valueOf
// "locker". They "key" is the "Data" constructor itself, which is scoped
// to the IIFE that wraps jQuery. This prevents outside tampering with the
// "valueOf" locker.
unlock = owner.valueOf( Data );
key: function( owner ) {
var descriptor = {},
// Check if the owner object already has a cache key
unlock = owner[ this.expando ];
// If no "unlock" string exists, then create a valueOf "locker"
// for storing the unlocker key. Since valueOf normally does not accept any
// arguments, extant calls to valueOf will still behave as expected.
if ( typeof unlock !== "string" ) {
unlock = jQuery.expando + Data.uid++;
ovalueOf = owner.valueOf;
// If not, create one
if ( !unlock ) {
unlock = Data.uid++;
descriptor[ this.expando ] = { value: unlock };
// Secure it in a non-enumerable, non-writable property
try {
Object.defineProperties( owner, descriptor );
Object.defineProperty( owner, "valueOf", {
value: function( pick ) {
if ( pick === Data ) {
return unlock;
}
return ovalueOf.apply( owner );
}
// By omitting explicit [ enumerable, writable, configurable ]
// they will default to "false"
});
// Support: Android<4
// Fallback to a less secure definition
} catch ( e ) {
descriptor[ this.expando ] = unlock;
jQuery.extend( owner, descriptor );
}
}
// If private or user data already create a valueOf locker
// then we'll reuse the unlock key, but still need to create
// a cache object for this instance (could be private or user)
// Ensure the cache object
if ( !this.cache[ unlock ] ) {
this.cache[ unlock ] = {};
}
@ -64,7 +56,7 @@ Data.prototype = {
// There may be an unlock assigned to this node,
// if there is no entry for this "owner", create one inline
// and set the unlock as though an owner entry had always existed
unlock = this.locker( owner );
unlock = this.key( owner );
cache = this.cache[ unlock ];
// Handle: [ owner, key, value ] args
@ -74,7 +66,7 @@ Data.prototype = {
// Handle: [ owner, { properties } ] args
} else {
// [*] In the case where there was actually no "owner" entry and
// this.locker( owner ) was called to create one, there will be
// this.key( owner ) was called to create one, there will be
// a corresponding empty plain object in the cache.
//
// Note, this will kill the reference between
@ -102,7 +94,7 @@ Data.prototype = {
// New caches will be created and the unlock returned,
// allowing direct access to the newly created
// empty data object.
var cache = this.cache[ this.locker( owner ) ];
var cache = this.cache[ this.key( owner ) ];
return key === undefined ?
cache : cache[ key ];
@ -138,7 +130,7 @@ Data.prototype = {
},
remove: function( owner, key ) {
var i, l, name,
unlock = this.locker( owner ),
unlock = this.key( owner ),
cache = this.cache[ unlock ];
if ( key === undefined ) {
@ -178,11 +170,11 @@ Data.prototype = {
},
hasData: function( owner ) {
return !jQuery.isEmptyObject(
this.cache[ this.locker( owner ) ]
this.cache[ this.key( owner ) ]
);
},
discard: function( owner ) {
delete this.cache[ this.locker( owner ) ];
delete this.cache[ this.key( owner ) ];
}
};