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29 lines
853 B
JavaScript
29 lines
853 B
JavaScript
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var createCtor = require('./_createCtor'),
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root = require('./_root');
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/** Used to compose bitmasks for function metadata. */
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var WRAP_BIND_FLAG = 1;
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/**
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* Creates a function that wraps `func` to invoke it with the optional `this`
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* binding of `thisArg`.
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*
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* @private
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* @param {Function} func The function to wrap.
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* @param {number} bitmask The bitmask flags. See `createWrap` for more details.
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* @param {*} [thisArg] The `this` binding of `func`.
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* @returns {Function} Returns the new wrapped function.
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*/
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function createBind(func, bitmask, thisArg) {
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var isBind = bitmask & WRAP_BIND_FLAG,
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Ctor = createCtor(func);
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function wrapper() {
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var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
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return fn.apply(isBind ? thisArg : this, arguments);
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}
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return wrapper;
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}
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module.exports = createBind;
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