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var global = require('./_global');
var core = require('./_core');
var ctx = require('./_ctx');
var hide = require('./_hide');
var PROTOTYPE = 'prototype';
var $export = function (type, name, source) {
var IS_FORCED = type & $export.F;
var IS_GLOBAL = type & $export.G;
var IS_STATIC = type & $export.S;
var IS_PROTO = type & $export.P;
var IS_BIND = type & $export.B;
var IS_WRAP = type & $export.W;
var exports = IS_GLOBAL ? core : core[name] || (core[name] = {});
var expProto = exports[PROTOTYPE];
var target = IS_GLOBAL ? global : IS_STATIC ? global[name] : (global[name] || {})[PROTOTYPE];
var key, own, out;
if (IS_GLOBAL) source = name;
for (key in source) {
// contains in native
own = !IS_FORCED && target && target[key] !== undefined;
if (own && key in exports) continue;
// export native or passed
out = own ? target[key] : source[key];
// prevent global pollution for namespaces
exports[key] = IS_GLOBAL && typeof target[key] != 'function' ? source[key]
// bind timers to global for call from export context
: IS_BIND && own ? ctx(out, global)
// wrap global constructors for prevent change them in library
: IS_WRAP && target[key] == out ? (function (C) {
var F = function (a, b, c) {
if (this instanceof C) {
switch (arguments.length) {
case 0: return new C();
case 1: return new C(a);
case 2: return new C(a, b);
} return new C(a, b, c);
} return C.apply(this, arguments);
};
F[PROTOTYPE] = C[PROTOTYPE];
return F;
// make static versions for prototype methods
})(out) : IS_PROTO && typeof out == 'function' ? ctx(Function.call, out) : out;
// export proto methods to core.%CONSTRUCTOR%.methods.%NAME%
if (IS_PROTO) {
(exports.virtual || (exports.virtual = {}))[key] = out;
// export proto methods to core.%CONSTRUCTOR%.prototype.%NAME%
if (type & $export.R && expProto && !expProto[key]) hide(expProto, key, out);
}
}
};
// type bitmap
$export.F = 1; // forced
$export.G = 2; // global
$export.S = 4; // static
$export.P = 8; // proto
$export.B = 16; // bind
$export.W = 32; // wrap
$export.U = 64; // safe
$export.R = 128; // real proto method for `library`
module.exports = $export;
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