60 lines
No EOL
1.6 KiB
JavaScript
Executable file
60 lines
No EOL
1.6 KiB
JavaScript
Executable file
var META = require('./_uid')('meta')
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, isObject = require('./_is-object')
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, has = require('./_has')
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, setDesc = require('./_object-dp').f
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, id = 0;
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var isExtensible = Object.isExtensible || function(){
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return true;
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};
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var FREEZE = !require('./_fails')(function(){
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return isExtensible(Object.preventExtensions({}));
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});
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var setMeta = function(it){
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setDesc(it, META, {value: {
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i: 'O' + ++id, // object ID
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w: {} // weak collections IDs
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}});
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};
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var fastKey = function(it, create){
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// return primitive with prefix
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if(!isObject(it))return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it;
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if(!has(it, META)){
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// can't set metadata to uncaught frozen object
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if(!isExtensible(it))return 'F';
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// not necessary to add metadata
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if(!create)return 'E';
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// add missing metadata
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setMeta(it);
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// return object ID
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} return it[META].i;
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};
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var getWeak = function(it, create){
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if(!has(it, META)){
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// can't set metadata to uncaught frozen object
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if(!isExtensible(it))return true;
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// not necessary to add metadata
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if(!create)return false;
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// add missing metadata
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setMeta(it);
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// return hash weak collections IDs
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} return it[META].w;
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};
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// add metadata on freeze-family methods calling
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var onFreeze = function(it){
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if(FREEZE && meta.NEED && isExtensible(it) && !has(it, META))setMeta(it);
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return it;
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};
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var meta = module.exports = {
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KEY: META,
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NEED: false,
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fastKey: fastKey,
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getWeak: getWeak,
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onFreeze: onFreeze
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};
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//////////////////
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// WEBPACK FOOTER
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// ./~/core-js/modules/_meta.js
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// module id = 199
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// module chunks = 4
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