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54 lines
1.3 KiB
54 lines
1.3 KiB
"use strict"; |
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var toPosInt = require("../number/to-pos-integer"); |
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var test = function (arg1, arg2) { return arg2; }; |
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var desc, defineProperty, generate, mixin; |
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try { |
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Object.defineProperty(test, "length", { |
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configurable: true, |
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writable: false, |
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enumerable: false, |
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value: 1 |
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}); |
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} |
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catch (ignore) {} |
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if (test.length === 1) { |
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// ES6 |
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desc = { configurable: true, writable: false, enumerable: false }; |
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defineProperty = Object.defineProperty; |
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module.exports = function (fn, length) { |
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length = toPosInt(length); |
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if (fn.length === length) return fn; |
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desc.value = length; |
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return defineProperty(fn, "length", desc); |
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}; |
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} else { |
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mixin = require("../object/mixin"); |
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generate = (function () { |
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var cache = []; |
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return function (length) { |
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var args, i = 0; |
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if (cache[length]) return cache[length]; |
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args = []; |
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while (length--) args.push("a" + (++i).toString(36)); |
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// eslint-disable-next-line no-new-func |
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return new Function( |
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"fn", |
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"return function (" + args.join(", ") + ") { return fn.apply(this, arguments); };" |
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); |
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}; |
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})(); |
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module.exports = function (src, length) { |
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var target; |
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length = toPosInt(length); |
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if (src.length === length) return src; |
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target = generate(length)(src); |
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try { mixin(target, src); } |
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catch (ignore) {} |
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return target; |
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}; |
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}
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