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import React from 'react';
import { Link } from '@material-ui/core';
interface PropTypes {
data: string;
}
type InlineRuleName = 'bold' | 'italic' | 'code' | 'strikeThrough';
interface InlineRuleProperties {
enclosure: string;
style: React.CSSProperties;
pattern?: RegExp;
}
const inlineRules: Record<InlineRuleName, InlineRuleProperties>= {
// Order matters - lowest property has highest priority
strikeThrough: {
enclosure: '~~',
style: { textDecoration: 'line-through' },
},
code: {
enclosure: '`',
style: { background: '#444444', padding: '4px' },
},
italic: {
enclosure: '\\*',
style: { fontStyle: 'italic' },
},
bold: {
enclosure: '\\*\\*',
style: { fontWeight: 'bold' },
},
};
const inlineRuleNames = Object.keys(inlineRules) as InlineRuleName[];
const captureInline = (enclosure: string): RegExp => {
return new RegExp(enclosure + '([^' + enclosure + ']+)' + enclosure);
}
const captureInlineSplit = (enclosure: string): string => {
return '(' + enclosure + '[^' + enclosure + ']+' + enclosure + ')';
}
const concealRegex = /!?\[(.+?)\]\((.+?)\)/;
const concealRegexSplit = /(!?\[.+?\]\(.+?\))/g;
const rawLinkRegex = /((?:(?:[A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=+$,\w]+@)?[A-Za-z0-9.-]+|(?:www\.|[-;:&=+$,\w]+@)[A-Za-z0-9.-]+)(?:(?:\/[+~%/.\w-_]*)?\??(?:[-+=&;%@.\w_]*)#?(?:[.!/\\\w]*))?)/;
const ruleSplitPatterns: string[] = [concealRegexSplit.source, rawLinkRegex.source];
inlineRuleNames.forEach(name => {
const enclosure = inlineRules[name].enclosure;
inlineRules[name].pattern = captureInline(enclosure);
ruleSplitPatterns.push(captureInlineSplit(enclosure));
});
const splitter = new RegExp(ruleSplitPatterns.join('|'));
const SyntaxSpan: React.FC<PropTypes> = ({ data }) => {
if (!data) return null;
const conceal = concealRegex.exec(data);
if (conceal) {
if (data[0] === '!') return <img src={conceal[2]} alt={conceal[1]} style={{ maxWidth: '100%', maxHeight: '100%' }} />;
return <Link href={conceal[2]}>{conceal[1]}</Link>;
}
if (data.match(rawLinkRegex)) return <Link href={data}>{data}</Link>;
let span = <>{data}</>;
inlineRuleNames.forEach(name => {
const rule = inlineRules[name];
const match = data.match(rule.pattern || '');
if (match) span = <span style={rule.style}>{match[1]}</span>;
});
return span;
}
const Paragraph: React.FC<PropTypes> = ({ data }) => {
const result = data.split(splitter).map(span => <SyntaxSpan data={span} />);
return <p> {result} </p>;
}
export default Paragraph;
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