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文件: /usr/share/atom/resources/app/apm/node_modules/es5-ext/string/#/code-point-at/shim.js
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// Based on: https://github.com/mathiasbynens/String.prototype.codePointAt // Thanks @mathiasbynens ! "use strict"; var toInteger = require("../../../number/to-integer") , validValue = require("../../../object/valid-value"); module.exports = function (pos) { var str = String(validValue(this)), length = str.length, first, second; pos = toInteger(pos); // Account for out-of-bounds indices: if (pos < 0 || pos >= length) return undefined; // Get the first code unit first = str.charCodeAt(pos); if (first >= 0xd800 && first <= 0xdbff && length > pos + 1) { second = str.charCodeAt(pos + 1); if (second >= 0xdc00 && second <= 0xdfff) { // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae return (first - 0xd800) * 0x400 + second - 0xdc00 + 0x10000; } } return first; };
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