88 lines
2 KiB
TypeScript
88 lines
2 KiB
TypeScript
import React from 'react';
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import classNames from 'classnames';
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import emojiRegex from 'emoji-regex';
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import { RenderTextCallbackType } from '../../types/Util';
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import { emojiToImage, SizeClassType } from '../emoji/lib';
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// Some of this logic taken from emoji-js/replacement
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function getImageTag({
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match,
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sizeClass,
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key,
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}: {
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match: any;
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sizeClass?: SizeClassType;
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key: string | number;
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}) {
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const img = emojiToImage(match[0]);
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if (!img) {
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return match[0];
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}
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return (
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// tslint:disable-next-line react-a11y-img-has-alt
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<img
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key={key}
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src={img}
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aria-label={match[0]}
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className={classNames('emoji', sizeClass)}
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title={match[0]}
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/>
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);
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}
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interface Props {
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text: string;
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/** A class name to be added to the generated emoji images */
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sizeClass?: SizeClassType;
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/** Allows you to customize now non-newlines are rendered. Simplest is just a <span>. */
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renderNonEmoji?: RenderTextCallbackType;
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}
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export class Emojify extends React.Component<Props> {
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public static defaultProps: Partial<Props> = {
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renderNonEmoji: ({ text }) => text,
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};
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public render() {
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const { text, sizeClass, renderNonEmoji } = this.props;
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const results: Array<any> = [];
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const regex = emojiRegex();
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// We have to do this, because renderNonEmoji is not required in our Props object,
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// but it is always provided via defaultProps.
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if (!renderNonEmoji) {
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return;
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}
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let match = regex.exec(text);
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let last = 0;
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let count = 1;
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if (!match) {
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return renderNonEmoji({ text, key: 0 });
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}
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while (match) {
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if (last < match.index) {
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const textWithNoEmoji = text.slice(last, match.index);
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results.push(renderNonEmoji({ text: textWithNoEmoji, key: count++ }));
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}
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results.push(getImageTag({ match, sizeClass, key: count++ }));
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last = regex.lastIndex;
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match = regex.exec(text);
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}
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if (last < text.length) {
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results.push(renderNonEmoji({ text: text.slice(last), key: count++ }));
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}
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return results;
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}
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}
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