catberry/lib/helpers/errorHelper.js

Catberry is an isomorphic framework for building universal front-end apps using components, Flux architecture and progressive rendering.

'use strict';

const ERROR_MESSAGE_REGEXP = /^(?:[\w$]+): (?:.+)\r?\n/i;

module.exports = {

	/**
	 * Prints an error with pretty formatting.
	 * @param {Error} error The error to print.
	 * @param {string} userAgent The user agent information.
	 * @returns {string} HTML text with all information about the error.
	 */
	prettyPrint: (error, userAgent) => {
		if (!error || typeof (error) !== 'object') {
			return '';
		}
		return `
<div style="background-color: white; font-size: 12pt;">
	${(new Date()).toUTCString()};<br/>
	${userAgent || 'Unknown browser'};<br/>
	Catberry@9.0.0 (
	<a href="https://github.com/catberry/catberry/issues" target="_blank">
		report an issue
	</a>)
	<br/><br/>
	<span style="color: red; font-size: 16pt; font-weight: bold;">
		${escape(error.name)}: ${escape(error.message)}
	</span>
	<br/><br/>
	${escape(error.stack).replace(ERROR_MESSAGE_REGEXP, '')}
</div>
`;
	}
};

/**
 * Escapes the error text.
 * @param {string} value The error text to escape.
 * @returns {string} The escaped and formatted string.
 */
function escape(value) {
	value = String(value || '');
	return value
		.replace(/&/g, '&amp;')
		.replace(/</g, '&lt;')
		.replace(/>/g, '&gt;')
		.replace(/\"/g, '&quot;')
		.replace(/\'/g, '&#39;')
		.replace(/\r?\n/g, '<br/>');
}