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utf8mb4
Commit Description:
utf8mb4
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node_modules/es5-ext/string/#/code-point-at/shim.js
| 26 lines
| 818 B
| application/javascript
| JavascriptLexer
|
| r789 | // 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; | ||||
| }; | ||||