41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
// https://github.com/twitter/twemoji-parser/blob/master/src/lib/regex.js
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export function encodeEmoji(emojiText: string) {
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const codepoints = toCodePoints(removeVS16s(emojiText)).join('-');
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return codepoints;
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}
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const vs16RegExp = /\uFE0F/g;
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// avoid using a string literal like '\u200D' here because minifiers expand it inline
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const zeroWidthJoiner = String.fromCharCode(0x200d);
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const removeVS16s = (rawEmoji: string) => (rawEmoji.indexOf(zeroWidthJoiner) < 0 ? rawEmoji.replace(vs16RegExp, '') : rawEmoji);
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export function toCodePoints(unicodeSurrogates: string): Array<string> {
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const points = [];
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let char = 0;
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let previous = 0;
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let i = 0;
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while(i < unicodeSurrogates.length) {
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char = unicodeSurrogates.charCodeAt(i++);
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if(previous) {
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points.push((0x10000 + ((previous - 0xd800) << 10) + (char - 0xdc00)).toString(16));
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previous = 0;
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} else if (char > 0xd800 && char <= 0xdbff) {
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previous = char;
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} else {
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points.push(char.toString(16));
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}
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}
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if(points.length && points[0].length == 2) {
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points[0] = '00' + points[0];
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}
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return points;
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}
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export function getEmojiToneIndex(input: string) {
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let match = input.match(/[\uDFFB-\uDFFF]/);
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return match ? 5 - (57343 - match[0].charCodeAt(0)) : 0;
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} |