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var Map = require('./es6.map')
, $export = require('./_export')
, shared = require('./_shared')('metadata')
, store = shared.store || (shared.store = new (require('./es6.weak-map')));
var getOrCreateMetadataMap = function(target, targetKey, create){
var targetMetadata = store.get(target);
if(!targetMetadata){
if(!create)return undefined;
store.set(target, targetMetadata = new Map);
}
var keyMetadata = targetMetadata.get(targetKey);
if(!keyMetadata){
if(!create)return undefined;
targetMetadata.set(targetKey, keyMetadata = new Map);
} return keyMetadata;
};
var ordinaryHasOwnMetadata = function(MetadataKey, O, P){
var metadataMap = getOrCreateMetadataMap(O, P, false);
return metadataMap === undefined ? false : metadataMap.has(MetadataKey);
};
var ordinaryGetOwnMetadata = function(MetadataKey, O, P){
var metadataMap = getOrCreateMetadataMap(O, P, false);
return metadataMap === undefined ? undefined : metadataMap.get(MetadataKey);
};
var ordinaryDefineOwnMetadata = function(MetadataKey, MetadataValue, O, P){
getOrCreateMetadataMap(O, P, true).set(MetadataKey, MetadataValue);
};
var ordinaryOwnMetadataKeys = function(target, targetKey){
var metadataMap = getOrCreateMetadataMap(target, targetKey, false)
, keys = [];
if(metadataMap)metadataMap.forEach(function(_, key){ keys.push(key); });
return keys;
};
var toMetaKey = function(it){
return it === undefined || typeof it == 'symbol' ? it : String(it);
};
var exp = function(O){
$export($export.S, 'Reflect', O);
};
module.exports = {
store: store,
map: getOrCreateMetadataMap,
has: ordinaryHasOwnMetadata,
get: ordinaryGetOwnMetadata,
set: ordinaryDefineOwnMetadata,
keys: ordinaryOwnMetadataKeys,
key: toMetaKey,
exp: exp
};
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