Fixed issue #980: incorrect LaTeX capturing and MathJax rendering

notebook/static/notebook/js/mathjaxutils.js

@@ -55,11 +55,9 @@ define([
     // Other minor modifications are also due to StackExchange and are used with
     // permission.
 
-    var inline = "$"; // the inline math delimiter
-
     // MATHSPLIT contains the pattern for math delimiters and special symbols
     // needed for searching for math in the text input.
-    var MATHSPLIT = /(\$\$?|\\(?:begin|end)\{[a-z]*\*?\}|\\[\\{}$]|[{}]|(?:\n\s*)+|@@\d+@@)/i;
+    var MATHSPLIT = /(\$\$?|\\(?:begin|end)\{[a-z]*\*?\}|\\[{}$]|[{}]|(?:\n\s*)+|@@\d+@@|\\\\(?:\(|\)|\[|\]))/i;
 
     //  The math is in blocks i through j, so
     //    collect it into one block and clear the others.
@@ -173,11 +171,16 @@ define([
                 //  Look for math start delimiters and when
                 //    found, set up the end delimiter.
                 //
-                if (block === inline || block === "$$") {
+                if (block === "$" || block === "$$") {
                     start = i;
                     end = block;
                     braces = 0;
                 }
+                else if (block === "\\\\\(" || block === "\\\\\[") {
+                    start = i;
+                    end = block.slice(-1) === "(" ? "\\\\\)" : "\\\\\]";
+                    braces = 0;
+                }
                 else if (block.substr(1, 5) === "begin") {
                     start = i;
                     end = "\\end" + block.substr(6);
@@ -199,9 +202,27 @@ define([
     //    and clear the math array (no need to keep it around).
     //
     var replace_math = function (text, math) {
-        text = text.replace(/@@(\d+)@@/g, function (match, n) {
-            return math[n];
-        });
+    	//
+    	//  Replaces a math placeholder with its corresponding group.
+    	//  The math delimiters "\\(", "\\[", "\\)" and "\\]" are replaced
+    	//  removing one backslash in order to be interpreted correctly by MathJax.
+    	//
+        var math_group_process = function (match, n) {
+            var math_group = math[n];
+
+            if (math_group.substr(0, 3) === "\\\\\("  && math_group.substr(math_group.length - 3) === "\\\\\)") {
+                math_group = "\\\(" + math_group.substring(3, math_group.length - 3) + "\\\)";
+            } else if (math_group.substr(0, 3) === "\\\\\[" && math_group.substr(math_group.length - 3) === "\\\\\]") {
+                math_group = "\\\[" + math_group.substring(3, math_group.length - 3) + "\\\]";
+            }
+
+            return math_group;
+        };
+
+        // Replace all the math group placeholders in the text
+        // with the saved strings.
+        text = text.replace(/@@(\d+)@@/g, math_group_process);
+
         return text;
     };