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