37 lines
1.2 KiB
JavaScript
37 lines
1.2 KiB
JavaScript
import { getEmojiRegex } from './emojiRegex'
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// replace emoji in HTML with something else, safely skipping HTML tags
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export function replaceEmoji (string, replacer) {
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let output = ''
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let leftAngleBracketIdx = string.indexOf('<')
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let currentIdx = 0
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let emojiRegex = getEmojiRegex()
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function safeReplacer (substring) {
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// emoji regex matches digits and pound sign https://git.io/fpl6J
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if (substring.match(/^[0-9#*™®]+$/)) {
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return substring
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}
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return replacer(substring)
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}
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while (leftAngleBracketIdx !== -1) {
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let substring = string.substring(currentIdx, leftAngleBracketIdx)
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output += substring.replace(emojiRegex, safeReplacer)
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let rightAngleBracketIdx = string.indexOf('>', leftAngleBracketIdx + 1)
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if (rightAngleBracketIdx === -1) { // broken HTML, abort
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output += string.substring(leftAngleBracketIdx, string.length)
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return output
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}
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output += string.substring(leftAngleBracketIdx, rightAngleBracketIdx) + '>'
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currentIdx = rightAngleBracketIdx + 1
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leftAngleBracketIdx = string.indexOf('<', currentIdx)
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}
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output += string.substring(currentIdx, string.length).replace(emojiRegex, safeReplacer)
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return output
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}
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