Merge pull request #3133 from dbolack-ab/Issue_2171

Add subscript and subscript markdown tokens

client/homebrew/editor/editor.jsx

@@ -160,6 +160,24 @@ const Editor = createClass({
 							}
 						}
 
+						// Superscript
+						if(line.includes('\^')) {
+							const regex = /\^(?!\s)(?=([^\n\^]*[^\s\^]))\1\^/g;
+							let match;
+							while ((match = regex.exec(line)) != null) {
+								codeMirror.markText({ line: lineNumber, ch: line.indexOf(match[1]) - 1 }, { line: lineNumber, ch: line.indexOf(match[1]) + match[1].length + 1 }, { className: 'superscript' });
+							}
+						}
+
+						// Subscript
+						if(line.includes('^^')) {
+							const regex = /\^\^(?!\s)(?=([^\n\^]*[^\s\^]))\1\^\^/g;
+							let match;
+							while ((match = regex.exec(line)) != null) {
+								codeMirror.markText({ line: lineNumber, ch: line.indexOf(match[1]) - 2 }, { line: lineNumber, ch: line.indexOf(match[1]) + match[1].length + 2 }, { className: 'subscript' });
+							}
+						}
+
 						// Highlight injectors {style}
 						if(line.includes('{') && line.includes('}')){
 							const regex = /(?:^|[^{\n])({(?=((?::(?:"[\w,\-()#%. ]*"|[\w\-()#%.]*)|[^"':{}\s]*)*))\2})/gm;

client/homebrew/editor/editor.less

@@ -43,6 +43,18 @@
 			font-weight : bold;
 			color       : green;
 		}
+		.superscript:not(.cm-comment) {
+			font-weight    : bold;
+			color          : goldenrod;
+			vertical-align : super;
+			font-size      : 0.9em;
+		}
+		.subscript:not(.cm-comment) {
+			font-weight    : bold;
+			color          : rgb(123, 123, 15);
+			vertical-align : sub;
+			font-size      : 0.9em;
+		}
 	}
 
 	.brewJump {

shared/naturalcrit/codeEditor/codeEditor.jsx

@@ -112,6 +112,10 @@ const CodeEditor = createClass({
 				'Shift-Tab'        : this.dedent,
 				'Ctrl-B'           : this.makeBold,
 				'Cmd-B'            : this.makeBold,
+				'Shift-Ctrl-='     : this.makeSuper,
+				'Shift-Cmd-='      : this.makeSuper,
+				'Ctrl-='           : this.makeSub,
+				'Cmd-='            : this.makeSub,
 				'Ctrl-I'           : this.makeItalic,
 				'Cmd-I'            : this.makeItalic,
 				'Ctrl-U'           : this.makeUnderline,
@@ -219,6 +223,25 @@ const CodeEditor = createClass({
 		}
 	},
 
+	makeSuper : function() {
+		const selection = this.codeMirror.getSelection(), t = selection.slice(0, 1) === '^' && selection.slice(-1) === '^';
+		this.codeMirror.replaceSelection(t ? selection.slice(1, -1) : `^${selection}^`, 'around');
+		if(selection.length === 0){
+			const cursor = this.codeMirror.getCursor();
+			this.codeMirror.setCursor({ line: cursor.line, ch: cursor.ch - 1 });
+		}
+	},
+
+	makeSub : function() {
+		const selection = this.codeMirror.getSelection(), t = selection.slice(0, 2) === '^^' && selection.slice(-2) === '^^';
+		this.codeMirror.replaceSelection(t ? selection.slice(2, -2) : `^^${selection}^^`, 'around');
+		if(selection.length === 0){
+			const cursor = this.codeMirror.getCursor();
+			this.codeMirror.setCursor({ line: cursor.line, ch: cursor.ch - 2 });
+		}
+	},
+
+
 	makeNbsp : function() {
 		this.codeMirror.replaceSelection(' ', 'end');
 	},

shared/naturalcrit/markdown.js

@@ -206,6 +206,34 @@ const mustacheInjectBlock = {
 	}
 };
 
+const superSubScripts = {
+	name  : 'superSubScript',
+	level : 'inline',
+	start(src) { return src.match(/\^/m)?.index; },  // Hint to Marked.js to stop and check for a match
+	tokenizer(src, tokens) {
+		const superRegex = /^\^(?!\s)(?=([^\n\^]*[^\s\^]))\1\^/m;
+		const subRegex   = /^\^\^(?!\s)(?=([^\n\^]*[^\s\^]))\1\^\^/m;
+		let isSuper = false;
+		let match = subRegex.exec(src);
+		if(!match){
+			match = superRegex.exec(src);
+			if(match)
+				isSuper = true;
+		}
+		if(match?.length) {
+			return {
+				type   : 'superSubScript', // Should match "name" above
+				raw    : match[0],          // Text to consume from the source
+				tag    : isSuper ? 'sup' : 'sub',
+				tokens : this.lexer.inlineTokens(match[1])
+			};
+		}
+	},
+	renderer(token) {
+		return `<${token.tag}>${this.parser.parseInline(token.tokens)}</${token.tag}>`;
+	}
+};
+
 const definitionLists = {
 	name  : 'definitionLists',
 	level : 'block',
@@ -238,7 +266,7 @@ const definitionLists = {
 	}
 };
 
-Marked.use({ extensions: [mustacheSpans, mustacheDivs, mustacheInjectInline, definitionLists] });
+Marked.use({ extensions: [mustacheSpans, mustacheDivs, mustacheInjectInline, definitionLists, superSubScripts] });
 Marked.use(mustacheInjectBlock);
 Marked.use({ renderer: renderer, mangle: false });
 Marked.use(MarkedExtendedTables(), MarkedGFMHeadingId(), MarkedSmartypantsLite());