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Add comments to isRegionalIndicator

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Signed-off-by: Robin Townsend <robin@robin.town>
This commit is contained in:
Robin Townsend 2021-08-05 17:56:16 -04:00
parent 4ace2353e3
commit fef2d408f6
1 changed files with 9 additions and 2 deletions
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11
src/emoji.ts
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@ -35,8 +35,15 @@ export const EMOTICON_TO_EMOJI = new Map<string, IEmoji>();
export const getEmojiFromUnicode = unicode => UNICODE_TO_EMOJI.get(stripVariation(unicode));
const isRegionalIndicator = (x: string): boolean =>
Array.from(x).length === 1 && x >= '\u{1f1e6}' && x <= '\u{1f1ff}';
const isRegionalIndicator = (x: string): boolean => {
// First verify that the string is a single character. We use Array.from
// to make sure we count by characters, not UTF-8 code units.
return Array.from(x).length === 1 &&
// Next verify that the character is within the code point range for
// regional indicators.
// http://unicode.org/charts/PDF/Unicode-6.0/U60-1F100.pdf
x >= '\u{1f1e6}' && x <= '\u{1f1ff}';
};
const EMOJIBASE_GROUP_ID_TO_CATEGORY = [
"people", // smileys