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utils.js
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utils.js
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/**
* Copyright(c) dtysky<dtysky@outlook.com>
* Created: 16/9/21
* Description:
*/
import {browserHistory} from 'react-router';
import katex from 'katex';
import _ from 'lodash';
export function getLocalUrl(type: string, name: string, index: number): string {
if (!name) {
return index ? `/${type}/${index}` : `/${type}`;
}
return index ? `/${type}/${name}/${index}` : `/${type}/${name}`;
}
export function redirectTo404() {
browserHistory.push('/404');
}
function parseExpression(raw: string, delimit: string, delimitEscaped: string, mathMode: boolean) {
const regex = new RegExp(`${_.escapeRegExp(delimit)}(.+?)${_.escapeRegExp(delimitEscaped)}`, 'g');
let ignoreMode = false;
return raw.split('\n').map(line => {
if (/<pre>/g.test(line)) {
ignoreMode = true;
}
if (!regex.test(line) || ignoreMode) {
return line;
}
if (ignoreMode && /<\/pre>/g.test(line)) {
ignoreMode = false;
}
return line.split(regex).map((snippet, index) => {
// $$aa$$bb$$cc$$ => ['', 'aa', 'bb', 'cc', ''], we don't need 'bb'
if (index % 2 === 0) {
return snippet;
}
try {
return katex.renderToString(snippet, {displayMode: mathMode});
} catch (err) {
if (process.env.NODE_ENV === 'development') {
console.log(err); // eslint-disable-line
}
const original = delimitEscaped + line + delimitEscaped;
return mathMode ? `<p style="text-align:center;">${original}<p>` : original;
}
}).join('');
}).join('\n');
}
export function renderWithKatex(unparsed, conf = [['$$', '$$', true], ['$', '$', false]]) {
let parsed = unparsed;
conf.forEach((c, index) => {
parsed = parseExpression(parsed, c[0], c[1], c[2], index === conf.length - 1);
});
return parsed;
}