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27 lines
660 B
27 lines
660 B
7 years ago
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// taken from:
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// https://github.com/twitter/twemoji/blob/47732c7/twemoji-generator.js#L848-L866
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exports.unicodeToFilename = (str) => {
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let result = '';
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let charCode = 0;
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let p = 0;
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let i = 0;
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while (i < str.length) {
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charCode = str.charCodeAt(i++);
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if (p) {
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if (result.length > 0) {
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result += '-';
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}
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result += (0x10000 + ((p - 0xD800) << 10) + (charCode - 0xDC00)).toString(16);
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p = 0;
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} else if (0xD800 <= charCode && charCode <= 0xDBFF) {
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p = charCode;
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} else {
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if (result.length > 0) {
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result += '-';
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}
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result += charCode.toString(16);
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}
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}
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return result;
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};
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