[smartymixed mode] Fix regexp escaping

Issue #2659

mode/smartymixed/smartymixed.js

@@ -9,6 +9,9 @@
 * @date 05.07.2013
 */
 
+// Warning: Don't base other modes on this one. This here is a
+// terrible way to write a mixed mode.
+
 (function(mod) {
   if (typeof exports == "object" && typeof module == "object") // CommonJS
     mod(require("../../lib/codemirror"), require("../htmlmixed/htmlmixed"), require("../smarty/smarty"));
@@ -20,11 +23,10 @@
 "use strict";
 
 CodeMirror.defineMode("smartymixed", function(config) {
-  var settings, regs, helpers, parsers,
-  htmlMixedMode = CodeMirror.getMode(config, "htmlmixed"),
-  smartyMode = CodeMirror.getMode(config, "smarty"),
+  var htmlMixedMode = CodeMirror.getMode(config, "htmlmixed");
+  var smartyMode = CodeMirror.getMode(config, "smarty");
 
-  settings = {
+  var settings = {
     rightDelimiter: '}',
     leftDelimiter: '{'
   };
@@ -36,15 +38,18 @@ CodeMirror.defineMode("smartymixed", function(config) {
     settings.rightDelimiter = config.rightDelimiter;
   }
 
-  regs = {
-    smartyComment: new RegExp("^" + settings.leftDelimiter + "\\*"),
-    literalOpen: new RegExp(settings.leftDelimiter + "literal" + settings.rightDelimiter),
-    literalClose: new RegExp(settings.leftDelimiter + "\/literal" + settings.rightDelimiter),
-    hasLeftDelimeter: new RegExp(".*" + settings.leftDelimiter),
-    htmlHasLeftDelimeter: new RegExp("[^<>]*" + settings.leftDelimiter)
+  function reEsc(str) { return str.replace(/[^\s\w]/g, "\\$&"); }
+
+  var reLeft = reEsc(settings.leftDelimiter), reRight = reEsc(settings.rightDelimiter);
+  var regs = {
+    smartyComment: new RegExp("^" + reRight + "\\*"),
+    literalOpen: new RegExp(reLeft + "literal" + reRight),
+    literalClose: new RegExp(reLeft + "\/literal" + reRight),
+    hasLeftDelimeter: new RegExp(".*" + reLeft),
+    htmlHasLeftDelimeter: new RegExp("[^<>]*" + reLeft)
   };
 
-  helpers = {
+  var helpers = {
     chain: function(stream, state, parser) {
       state.tokenize = parser;
       return parser(stream, state);
@@ -70,7 +75,7 @@ CodeMirror.defineMode("smartymixed", function(config) {
     }
   };
 
-  parsers = {
+  var parsers = {
     html: function(stream, state) {
       if (!state.inLiteral && stream.match(regs.htmlHasLeftDelimeter, false) && state.htmlMixedState.htmlState.tagName === null) {
         state.tokenize = parsers.smarty;