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28 lines
999 B
JavaScript
28 lines
999 B
JavaScript
var $ = require('../internals/export');
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var toAbsoluteIndex = require('../internals/to-absolute-index');
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var fromCharCode = String.fromCharCode;
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var nativeFromCodePoint = String.fromCodePoint;
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// length should be 1, old FF problem
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var INCORRECT_LENGTH = !!nativeFromCodePoint && nativeFromCodePoint.length != 1;
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// `String.fromCodePoint` method
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// https://tc39.github.io/ecma262/#sec-string.fromcodepoint
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$({ target: 'String', stat: true, forced: INCORRECT_LENGTH }, {
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fromCodePoint: function fromCodePoint(x) { // eslint-disable-line no-unused-vars
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var elements = [];
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var length = arguments.length;
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var i = 0;
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var code;
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while (length > i) {
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code = +arguments[i++];
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if (toAbsoluteIndex(code, 0x10FFFF) !== code) throw RangeError(code + ' is not a valid code point');
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elements.push(code < 0x10000
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? fromCharCode(code)
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: fromCharCode(((code -= 0x10000) >> 10) + 0xD800, code % 0x400 + 0xDC00)
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);
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} return elements.join('');
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}
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});
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