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Merge pull request #3814 from matrix-org/dbkr/heal_a_broken_heart

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Strip all variation selectors on emoji
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David Baker 2020-01-08 10:29:54 +00:00 committed by GitHub
commit 4e6bf3079a
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1 changed files with 20 additions and 11 deletions
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31
src/emoji.js
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@ -16,14 +16,12 @@ limitations under the License.
import EMOJIBASE from 'emojibase-data/en/compact.json';
export const VARIATION_SELECTOR = String.fromCharCode(0xFE0F);
// The unicode is stored without the variant selector
const UNICODE_TO_EMOJI = new Map(); // not exported as gets for it are handled by getEmojiFromUnicode
export const EMOTICON_TO_EMOJI = new Map();
export const SHORTCODE_TO_EMOJI = new Map();
export const getEmojiFromUnicode = unicode => UNICODE_TO_EMOJI.get(unicode.replace(VARIATION_SELECTOR, ""));
export const getEmojiFromUnicode = unicode => UNICODE_TO_EMOJI.get(stripVariation(unicode));
const EMOJIBASE_GROUP_ID_TO_CATEGORY = [
"people", // smileys
@ -51,13 +49,6 @@ export const DATA_BY_CATEGORY = {
// Store various mappings from unicode/emoticon/shortcode to the Emoji objects
EMOJIBASE.forEach(emoji => {
if (emoji.unicode.includes(VARIATION_SELECTOR)) {
// Clone data into variation-less version
emoji = Object.assign({}, emoji, {
unicode: emoji.unicode.replace(VARIATION_SELECTOR, ""),
});
}
const categoryId = EMOJIBASE_GROUP_ID_TO_CATEGORY[emoji.group];
if (DATA_BY_CATEGORY.hasOwnProperty(categoryId)) {
DATA_BY_CATEGORY[categoryId].push(emoji);
@ -66,7 +57,13 @@ EMOJIBASE.forEach(emoji => {
emoji.filterString = `${emoji.annotation}\n${emoji.shortcodes.join('\n')}}\n${emoji.emoticon || ''}`.toLowerCase();
// Add mapping from unicode to Emoji object
UNICODE_TO_EMOJI.set(emoji.unicode, emoji);
// The 'unicode' field that we use in emojibase has either
// VS15 or VS16 appended to any characters that can take
// variation selectors. Which one it appends depends
// on whether emojibase considers their type to be 'text' or
// 'emoji'. We therefore strip any variation chars from strings
// both when building the map and when looking up.
UNICODE_TO_EMOJI.set(stripVariation(emoji.unicode), emoji);
if (emoji.emoticon) {
// Add mapping from emoticon to Emoji object
@ -80,3 +77,15 @@ EMOJIBASE.forEach(emoji => {
});
}
});
/**
* Strips variation selectors from a string
* NB. Skin tone modifers are not variation selectors:
* this function does not touch them. (Should it?)
*
* @param {string} str string to strip
* @returns {string} stripped string
*/
function stripVariation(str) {
return str.replace(/[\uFE00-\uFE0F]/, "");
}