Check for possible pre-existing marker strings in Handlebars

components/prism-handlebars.js

@@ -51,9 +51,15 @@
 
 		env.backupCode = env.code;
 		env.code = env.code.replace(handlebars_pattern, function(match) {
-			env.tokenStack.push(match);
+			var i = env.tokenStack.length;
+			// Check for existing strings
+			while (env.backupCode.indexOf('___HANDLEBARS' + i + '___') !== -1)
+				++i;
 
-			return '___HANDLEBARS' + env.tokenStack.length + '___';
+			// Create a sparse array
+			env.tokenStack[i] = match;
+
+			return '___HANDLEBARS' + i + '___';
 		});
 	});
 
@@ -72,9 +78,12 @@
 			return;
 		}
 
-		for (var i = 0, t; t = env.tokenStack[i]; i++) {
+		for (var i = 0, keys = Object.keys(env.tokenStack); i < keys.length; ++i) {
+			var k = keys[i];
+			var t = env.tokenStack[k];
+
 			// The replace prevents $$, $&, $`, $', $n, $nn from being interpreted as special patterns
-			env.highlightedCode = env.highlightedCode.replace('___HANDLEBARS' + (i + 1) + '___', Prism.highlight(t, env.grammar, 'handlebars').replace(/\$/g, '$$$$'));
+			env.highlightedCode = env.highlightedCode.replace('___HANDLEBARS' + k + '___', Prism.highlight(t, env.grammar, 'handlebars').replace(/\$/g, '$$$$'));
 		}
 
 		env.element.innerHTML = env.highlightedCode;