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64 lines
2.1 KiB
64 lines
2.1 KiB
7 years ago
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/*! http://mths.be/fromcodepoint v0.1.0 by @mathias */
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if (!String.fromCodePoint) {
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(function () {
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var defineProperty = (function () {
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// IE 8 only supports `Object.defineProperty` on DOM elements
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try {
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var object = {};
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var $defineProperty = Object.defineProperty;
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var result = $defineProperty(object, object, object) && $defineProperty;
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} catch (error) {
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}
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return result;
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}());
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var stringFromCharCode = String.fromCharCode;
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var floor = Math.floor;
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var fromCodePoint = function () {
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var MAX_SIZE = 0x4000;
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var codeUnits = [];
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var highSurrogate;
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var lowSurrogate;
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var index = -1;
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var length = arguments.length;
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if (!length) {
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return '';
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}
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var result = '';
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while (++index < length) {
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var codePoint = Number(arguments[index]);
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if (
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!isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
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codePoint < 0 || // not a valid Unicode code point
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codePoint > 0x10FFFF || // not a valid Unicode code point
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floor(codePoint) != codePoint // not an integer
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) {
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throw RangeError('Invalid code point: ' + codePoint);
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}
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if (codePoint <= 0xFFFF) { // BMP code point
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codeUnits.push(codePoint);
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} else { // Astral code point; split in surrogate halves
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// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
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codePoint -= 0x10000;
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highSurrogate = (codePoint >> 10) + 0xD800;
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lowSurrogate = (codePoint % 0x400) + 0xDC00;
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codeUnits.push(highSurrogate, lowSurrogate);
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}
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if (index + 1 == length || codeUnits.length > MAX_SIZE) {
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result += stringFromCharCode.apply(null, codeUnits);
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codeUnits.length = 0;
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}
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}
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return result;
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};
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if (defineProperty) {
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defineProperty(String, 'fromCodePoint', {
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'value': fromCodePoint,
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'configurable': true,
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'writable': true
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});
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} else {
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String.fromCodePoint = fromCodePoint;
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}
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}());
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}
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