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'use strict';
var dP = require('./_object-dp').f
, create = require('./_object-create')
, redefineAll = require('./_redefine-all')
, ctx = require('./_ctx')
, anInstance = require('./_an-instance')
, defined = require('./_defined')
, forOf = require('./_for-of')
, $iterDefine = require('./_iter-define')
, step = require('./_iter-step')
, setSpecies = require('./_set-species')
, DESCRIPTORS = require('./_descriptors')
, fastKey = require('./_meta').fastKey
, SIZE = DESCRIPTORS ? '_s' : 'size';
var getEntry = function(that, key){
// fast case
var index = fastKey(key), entry;
if(index !== 'F')return that._i[index];
// frozen object case
for(entry = that._f; entry; entry = entry.n){
if(entry.k == key)return entry;
}
};
module.exports = {
getConstructor: function(wrapper, NAME, IS_MAP, ADDER){
var C = wrapper(function(that, iterable){
anInstance(that, C, NAME, '_i');
that._i = create(null); // index
that._f = undefined; // first entry
that._l = undefined; // last entry
that[SIZE] = 0; // size
if(iterable != undefined)forOf(iterable, IS_MAP, that[ADDER], that);
});
redefineAll(C.prototype, {
// 23.1.3.1 Map.prototype.clear()
// 23.2.3.2 Set.prototype.clear()
clear: function clear(){
for(var that = this, data = that._i, entry = that._f; entry; entry = entry.n){
entry.r = true;
if(entry.p)entry.p = entry.p.n = undefined;
delete data[entry.i];
}
that._f = that._l = undefined;
that[SIZE] = 0;
},
// 23.1.3.3 Map.prototype.delete(key)
// 23.2.3.4 Set.prototype.delete(value)
'delete': function(key){
var that = this
, entry = getEntry(that, key);
if(entry){
var next = entry.n
, prev = entry.p;
delete that._i[entry.i];
entry.r = true;
if(prev)prev.n = next;
if(next)next.p = prev;
if(that._f == entry)that._f = next;
if(that._l == entry)that._l = prev;
that[SIZE]--;
} return !!entry;
},
// 23.2.3.6 Set.prototype.forEach(callbackfn, thisArg = undefined)
// 23.1.3.5 Map.prototype.forEach(callbackfn, thisArg = undefined)
forEach: function forEach(callbackfn /*, that = undefined */){
anInstance(this, C, 'forEach');
var f = ctx(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3)
, entry;
while(entry = entry ? entry.n : this._f){
f(entry.v, entry.k, this);
// revert to the last existing entry
while(entry && entry.r)entry = entry.p;
}
},
// 23.1.3.7 Map.prototype.has(key)
// 23.2.3.7 Set.prototype.has(value)
has: function has(key){
return !!getEntry(this, key);
}
});
if(DESCRIPTORS)dP(C.prototype, 'size', {
get: function(){
return defined(this[SIZE]);
}
});
return C;
},
def: function(that, key, value){
var entry = getEntry(that, key)
, prev, index;
// change existing entry
if(entry){
entry.v = value;
// create new entry
} else {
that._l = entry = {
i: index = fastKey(key, true), // <- index
k: key, // <- key
v: value, // <- value
p: prev = that._l, // <- previous entry
n: undefined, // <- next entry
r: false // <- removed
};
if(!that._f)that._f = entry;
if(prev)prev.n = entry;
that[SIZE]++;
// add to index
if(index !== 'F')that._i[index] = entry;
} return that;
},
getEntry: getEntry,
setStrong: function(C, NAME, IS_MAP){
// add .keys, .values, .entries, [@@iterator]
// 23.1.3.4, 23.1.3.8, 23.1.3.11, 23.1.3.12, 23.2.3.5, 23.2.3.8, 23.2.3.10, 23.2.3.11
$iterDefine(C, NAME, function(iterated, kind){
this._t = iterated; // target
this._k = kind; // kind
this._l = undefined; // previous
}, function(){
var that = this
, kind = that._k
, entry = that._l;
// revert to the last existing entry
while(entry && entry.r)entry = entry.p;
// get next entry
if(!that._t || !(that._l = entry = entry ? entry.n : that._t._f)){
// or finish the iteration
that._t = undefined;
return step(1);
}
// return step by kind
if(kind == 'keys' )return step(0, entry.k);
if(kind == 'values')return step(0, entry.v);
return step(0, [entry.k, entry.v]);
}, IS_MAP ? 'entries' : 'values' , !IS_MAP, true);
// add [@@species], 23.1.2.2, 23.2.2.2
setSpecies(NAME);
}
};
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