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// 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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const match = input.match(/[\uDFFB-\uDFFF]/); |
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return match ? 5 - (57343 - match[0].charCodeAt(0)) : 0; |
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} |
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const VIRTUAL_COUNTRIES_EMOJIS: Map<string, string> = new Map([ |
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['FT', '🏴☠'] |
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]); |
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export function getCountryEmoji(iso2: string) { |
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return VIRTUAL_COUNTRIES_EMOJIS.get(iso2) ?? |
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String.fromCharCode(55356, 56741 + iso2.charCodeAt(0), 55356, 56741 + iso2.charCodeAt(1)); |
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} |
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export function emojiFromCodePoints(codePoints: string) { |
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return codePoints.split('-').reduce((prev, curr) => prev + String.fromCodePoint(parseInt(curr, 16)), ''); |
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}
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