Legacy renderer (#1184)

* Include two versions of Marked.js

* Include two versions of Marked.js

* Working two different render pipelines

Adds stylesheet "styleLegacy.less"
Adds markdownHandler "markdownLegacy.js"
The BrewRenderer will switch between these and the new pipeline dependent on the "version" prop passed in.

* Mustache-style div blocks

* Legacy snippets & columnbreak

* Codemirror styling for Div Blocks

* Lint

* Codemirror highlights for inline Divs as well

These will turn red `{{class Content}}`

Multi-line divs will turn purple

```
{{class,class2
content
}}
```

No real need for these to be different colors. Just for testing.

* More lint

* Update dependencies.

* Adding Button to switch render pipelines

* Update Marked.js

* Popup alert to refresh page when renderer changed

* Don't compress files in Development (very slow)

* Block DIV or inline Span depending on {{ placement

* \column emits a Div instead of Span

* Allow share page to use new renderer

* {{ divs no longer need empty lines. Spans work in lists.

* Typo

* Typo

* Enforce \page must be at start of line. Code cleanup.

* Inject newlines after/before {{/}} to avoid needing blank lines

* Fixes issues with tables.

* Remove console.log

* Fix spacing issue for Spans

* Move things from Brewrenderer to Markdown

Try to keep all custom text fiddling in one spot.

* Rename variables

* Update Font-Awesome to v5.15. Fix style issues on popups.

* Update {{ Divs/Spans, Fix nested hilighting

* Fixed Spans/divs with no tags or just commas

* Use blacklist for {{ to allow more characters

* Update package-lock.json

* Update all icons to Font-awesome 5

* V3 hidden behind config variable

Add "globalThis.enable_v3 = true" in the console to enable.

* lint

shared/naturalcrit/markdownLegacy.js

@@ -0,0 +1,159 @@
+const _ = require('lodash');
+const Markdown = require('markedLegacy');
+const renderer = new Markdown.Renderer();
+
+//Processes the markdown within an HTML block if it's just a class-wrapper
+renderer.html = function (html) {
+	if(_.startsWith(_.trim(html), '<div') && _.endsWith(_.trim(html), '</div>')){
+		const openTag = html.substring(0, html.indexOf('>')+1);
+		html = html.substring(html.indexOf('>')+1);
+		html = html.substring(0, html.lastIndexOf('</div>'));
+		return `${openTag} ${Markdown(html)} </div>`;
+	}
+	return html;
+};
+
+renderer.link = function (href, title, text) {
+	let self = false;
+	if(href[0] == '#') {
+		self = true;
+	}
+	href = cleanUrl(this.options.sanitize, this.options.baseUrl, href);
+
+	if(href === null) {
+		return text;
+	}
+	let out = `<a href="${escape(href)}"`;
+	if(title) {
+		out += ` title="${title}"`;
+	}
+	if(self) {
+		out += ' target="_self"';
+	}
+	out += `>${text}</a>`;
+	return out;
+};
+
+const nonWordAndColonTest = /[^\w:]/g;
+const cleanUrl = function (sanitize, base, href) {
+	if(sanitize) {
+		let prot;
+		try {
+			prot = decodeURIComponent(unescape(href))
+        .replace(nonWordAndColonTest, '')
+        .toLowerCase();
+		} catch (e) {
+			return null;
+		}
+		if(prot.indexOf('javascript:') === 0 || prot.indexOf('vbscript:') === 0 || prot.indexOf('data:') === 0) {
+			return null;
+		}
+	}
+	try {
+		href = encodeURI(href).replace(/%25/g, '%');
+	} catch (e) {
+		return null;
+	}
+	return href;
+};
+
+const escapeTest = /[&<>"']/;
+const escapeReplace = /[&<>"']/g;
+const escapeTestNoEncode = /[<>"']|&(?!#?\w+;)/;
+const escapeReplaceNoEncode = /[<>"']|&(?!#?\w+;)/g;
+const escapeReplacements = {
+	'&'  : '&amp;',
+	'<'  : '&lt;',
+	'>'  : '&gt;',
+	'"'  : '&quot;',
+	'\'' : '&#39;'
+};
+const getEscapeReplacement = (ch)=>escapeReplacements[ch];
+const escape = function (html, encode) {
+	if(encode) {
+		if(escapeTest.test(html)) {
+			return html.replace(escapeReplace, getEscapeReplacement);
+		}
+	} else {
+		if(escapeTestNoEncode.test(html)) {
+			return html.replace(escapeReplaceNoEncode, getEscapeReplacement);
+		}
+	}
+
+	return html;
+};
+
+const sanatizeScriptTags = (content)=>{
+	return content
+		.replace(/<script/ig, '&lt;script')
+		.replace(/<\/script>/ig, '&lt;/script&gt;');
+};
+
+const tagTypes = ['div', 'span', 'a'];
+const tagRegex = new RegExp(`(${
+	_.map(tagTypes, (type)=>{
+		return `\\<${type}|\\</${type}>`;
+	}).join('|')})`, 'g');
+
+
+module.exports = {
+	marked : Markdown,
+	render : (rawBrewText)=>{
+		return Markdown(
+			sanatizeScriptTags(rawBrewText),
+			{ renderer: renderer }
+		);
+	},
+
+	validate : (rawBrewText)=>{
+		const errors = [];
+		const leftovers = _.reduce(rawBrewText.split('\n'), (acc, line, _lineNumber)=>{
+			const lineNumber = _lineNumber + 1;
+			const matches = line.match(tagRegex);
+			if(!matches || !matches.length) return acc;
+
+			_.each(matches, (match)=>{
+				_.each(tagTypes, (type)=>{
+					if(match == `<${type}`){
+						acc.push({
+							type : type,
+							line : lineNumber
+						});
+					}
+					if(match === `</${type}>`){
+						if(!acc.length){
+							errors.push({
+								line : lineNumber,
+								type : type,
+								text : 'Unmatched closing tag',
+								id   : 'CLOSE'
+							});
+						} else if(_.last(acc).type == type){
+							acc.pop();
+						} else {
+							errors.push({
+								line : `${_.last(acc).line} to ${lineNumber}`,
+								type : type,
+								text : 'Type mismatch on closing tag',
+								id   : 'MISMATCH'
+							});
+							acc.pop();
+						}
+					}
+				});
+			});
+			return acc;
+		}, []);
+
+		_.each(leftovers, (unmatched)=>{
+			errors.push({
+				line : unmatched.line,
+				type : unmatched.type,
+				text : 'Unmatched opening tag',
+				id   : 'OPEN'
+			});
+		});
+
+		return errors;
+	},
+};