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121 lines
4.1 KiB
TypeScript
121 lines
4.1 KiB
TypeScript
/*
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Copyright 2019 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import EMOJIBASE from 'emojibase-data/en/compact.json';
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import SHORTCODES from 'emojibase-data/en/shortcodes/iamcal.json';
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export interface IEmoji {
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annotation: string;
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group?: number;
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hexcode: string;
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order?: number;
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shortcodes: string[];
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tags?: string[];
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unicode: string;
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skins?: Omit<IEmoji, "shortcodes" | "tags">[]; // Currently unused
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emoticon?: string;
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}
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// The unicode is stored without the variant selector
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const UNICODE_TO_EMOJI = new Map<string, IEmoji>(); // not exported as gets for it are handled by getEmojiFromUnicode
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export const EMOTICON_TO_EMOJI = new Map<string, IEmoji>();
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export const getEmojiFromUnicode = unicode => UNICODE_TO_EMOJI.get(stripVariation(unicode));
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const isRegionalIndicator = (x: string): boolean => {
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// First verify that the string is a single character. We use Array.from
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// to make sure we count by characters, not UTF-8 code units.
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return Array.from(x).length === 1 &&
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// Next verify that the character is within the code point range for
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// regional indicators.
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// http://unicode.org/charts/PDF/Unicode-6.0/U60-1F100.pdf
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x >= '\u{1f1e6}' && x <= '\u{1f1ff}';
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};
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const EMOJIBASE_GROUP_ID_TO_CATEGORY = [
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"people", // smileys
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"people", // actually people
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"control", // modifiers and such, not displayed in picker
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"nature",
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"foods",
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"places",
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"activity",
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"objects",
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"symbols",
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"flags",
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];
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export const DATA_BY_CATEGORY = {
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"people": [],
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"nature": [],
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"foods": [],
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"places": [],
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"activity": [],
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"objects": [],
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"symbols": [],
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"flags": [],
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};
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// Store various mappings from unicode/emoticon/shortcode to the Emoji objects
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export const EMOJI: IEmoji[] = EMOJIBASE.map((emojiData: Omit<IEmoji, "shortcodes">) => {
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// If there's ever a gap in shortcode coverage, we fudge it by
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// filling it in with the emoji's CLDR annotation
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const shortcodeData = SHORTCODES[emojiData.hexcode] ??
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[emojiData.annotation.toLowerCase().replace(/ /g, "_")];
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const emoji: IEmoji = {
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...emojiData,
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// Homogenize shortcodes by ensuring that everything is an array
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shortcodes: typeof shortcodeData === "string" ? [shortcodeData] : shortcodeData,
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};
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// We manually include regional indicators in the symbols group, since
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// Emojibase intentionally leaves them uncategorized
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const categoryId = EMOJIBASE_GROUP_ID_TO_CATEGORY[emoji.group] ??
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(isRegionalIndicator(emoji.unicode) ? "symbols" : null);
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if (DATA_BY_CATEGORY.hasOwnProperty(categoryId)) {
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DATA_BY_CATEGORY[categoryId].push(emoji);
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}
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// Add mapping from unicode to Emoji object
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// The 'unicode' field that we use in emojibase has either
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// VS15 or VS16 appended to any characters that can take
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// variation selectors. Which one it appends depends
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// on whether emojibase considers their type to be 'text' or
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// 'emoji'. We therefore strip any variation chars from strings
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// both when building the map and when looking up.
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UNICODE_TO_EMOJI.set(stripVariation(emoji.unicode), emoji);
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if (emoji.emoticon) {
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// Add mapping from emoticon to Emoji object
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EMOTICON_TO_EMOJI.set(emoji.emoticon, emoji);
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}
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return emoji;
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});
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/**
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* Strips variation selectors from the end of given string
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* NB. Skin tone modifiers are not variation selectors:
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* this function does not touch them. (Should it?)
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*
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* @param {string} str string to strip
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* @returns {string} stripped string
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*/
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function stripVariation(str) {
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return str.replace(/[\uFE00-\uFE0F]$/, "");
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}
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