Show invisibles inside tokens

plugins/show-invisibles/prism-show-invisibles.css

@@ -9,8 +9,8 @@
 .token.cr:before,
 .token.lf:before,
 .token.space:before {
-	color: inherit;
-	opacity: 0.4;
+	color: #888;
+	opacity: 0.6;
 	position: absolute;
 }
 

plugins/show-invisibles/prism-show-invisibles.js

@@ -1,21 +1,80 @@
-(function(){
-
-if (
-	typeof self !== 'undefined' && !self.Prism ||
-	typeof global !== 'undefined' && !global.Prism
-) {
-	return;
-}
-
-Prism.hooks.add('before-highlight', function(env) {
-	var tokens = env.grammar;
-
-	if (!tokens) return;
-
-	tokens.tab = /\t/g;
-	tokens.crlf = /\r\n/g;
-	tokens.lf = /\n/g;
-	tokens.cr = /\r/g;
-	tokens.space = / /g;
-});
+(function () {
+
+	if (
+		typeof self !== 'undefined' && !self.Prism ||
+		typeof global !== 'undefined' && !global.Prism
+	) {
+		return;
+	}
+
+
+	var invisibles = {
+		'tab': /\t/,
+		'crlf': /\r\n/,
+		'lf': /\n/,
+		'cr': /\r/,
+		'space': / /
+	};
+
+
+	/**
+	 * Handles the recursive  calling of `addInvisibles` for one token.
+	 *
+	 * @param {Object|Array} tokens The grammar or array which contains the token.
+	 * @param {string|number} name The name or index of the token in `tokens`.
+	 */
+	function handleToken(tokens, name) {
+		var value = tokens[name];
+
+		var type = Prism.util.type(value);
+		switch (type) {
+			case 'RegExp':
+				var inside = {};
+				tokens[name] = {
+					pattern: value,
+					inside: inside
+				};
+				addInvisibles(inside);
+				break;
+
+			case 'Array':
+				for (var i = 0, l = value.length; i < l; i++)
+					handleToken(value, i);
+				break;
+
+			default: // 'Object'
+				var inside = value.inside || (value.inside = {});
+				addInvisibles(inside);
+				break;
+		}
+	}
+
+	/**
+	 * Recursively adds patterns to match invisible characters to the given grammar (if not added already).
+	 *
+	 * @param {Object} grammar
+	 */
+	function addInvisibles(grammar) {
+		if (!grammar || grammar['tab'])
+			return;
+
+		// assign invisibles here to "mark" the grammar in case of self references
+		for (var name in invisibles) {
+			if (invisibles.hasOwnProperty(name))
+				grammar[name] = invisibles[name];
+		}
+
+		for (var name in grammar) {
+			if (grammar.hasOwnProperty(name) && !invisibles[name]) {
+				if (name === 'rest')
+					addInvisibles(grammar['rest']);
+				else
+					handleToken(grammar, name);
+			}
+		}
+	}
+
+	Prism.hooks.add('before-highlight', function (env) {
+		addInvisibles(env.grammar);
+	});
 })();