80 lines
2.2 KiB
TypeScript
80 lines
2.2 KiB
TypeScript
import debug from 'debug';
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import { emojiRegexPolyfill } from '@/mastodon/polyfills';
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import { VARIATION_SELECTOR_CODE } from './constants';
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export function emojiLogger(segment: string) {
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return debug(`emojis:${segment}`);
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}
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export function isUnicodeEmoji(input: string): boolean {
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return (
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input.length > 0 &&
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new RegExp(`^(${EMOJI_REGEX})+$`, supportedFlags()).test(input)
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);
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}
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export function stringHasUnicodeFlags(input: string): boolean {
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if (supportsRegExpSets()) {
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return new RegExp(
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'\\p{RGI_Emoji_Flag_Sequence}|\\p{RGI_Emoji_Tag_Sequence}',
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'v',
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).test(input);
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}
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return new RegExp(
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// First range is regional indicator symbols,
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// Second is a black flag + 0-9|a-z tag chars + cancel tag.
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// See: https://en.wikipedia.org/wiki/Regional_indicator_symbol
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'(?:\uD83C[\uDDE6-\uDDFF]){2}|\uD83C\uDFF4(?:\uDB40[\uDC30-\uDC7A])+\uDB40\uDC7F',
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).test(input);
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}
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// Constant as this is supported by all browsers.
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const CUSTOM_EMOJI_REGEX = /:([a-z0-9_]+):/i;
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// Use the polyfill regex or the Unicode property escapes if supported.
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const EMOJI_REGEX = emojiRegexPolyfill?.source ?? '\\p{RGI_Emoji}';
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export function isCustomEmoji(input: string): boolean {
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return new RegExp(`^${CUSTOM_EMOJI_REGEX.source}$`, 'i').test(input);
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}
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export function anyEmojiRegex() {
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return new RegExp(
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`${EMOJI_REGEX}|${CUSTOM_EMOJI_REGEX.source}`,
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supportedFlags('gi'),
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);
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}
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export function emojiToUnicodeHex(emoji: string): string {
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const codes: string[] = [];
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for (const char of emoji) {
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const code = char.codePointAt(0);
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if (code !== undefined) {
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codes.push(code.toString(16).toUpperCase().padStart(4, '0'));
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}
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}
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// Handles how Emojibase removes the variation selector for single code emojis.
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// See: https://emojibase.dev/docs/spec/#merged-variation-selectors
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if (
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codes.at(1) === VARIATION_SELECTOR_CODE.toString(16).toUpperCase() &&
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codes.length === 2
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) {
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codes.pop();
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}
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return codes.join('-');
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}
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function supportsRegExpSets() {
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return 'unicodeSets' in RegExp.prototype;
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}
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function supportedFlags(flags = '') {
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if (supportsRegExpSets()) {
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return `${flags}v`;
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}
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return flags;
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}
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