From afaec30d0a054dd2525fead1ee9330d3103c494d Mon Sep 17 00:00:00 2001
From: Kevin Barabash <kevinb7@gmail.com>
Date: Mon, 22 Sep 2014 09:41:26 -0600
Subject: [PATCH] added position property to ParseError

---
 src/ParseError.js  |  2 ++
 test/katex-spec.js | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/src/ParseError.js b/src/ParseError.js
index 91cbb1e0b..320f0bd69 100644
--- a/src/ParseError.js
+++ b/src/ParseError.js
@@ -29,6 +29,8 @@ function ParseError(message, lexer, position) {
     var self = new Error(error);
     self.name = "ParseError";
     self.__proto__ = ParseError.prototype;
+
+    self.position = position;
     return self;
 }
 
diff --git a/test/katex-spec.js b/test/katex-spec.js
index ef977932b..ce0c12c49 100644
--- a/test/katex-spec.js
+++ b/test/katex-spec.js
@@ -1040,3 +1040,13 @@ describe("An accent builder", function() {
         expect(getBuilt("\\vec )^2")[0].classes).not.toContain("mclose");
     });
 });
+
+describe("A parser error", function () {
+    it("should report the position of an error", function () {
+        try {
+            parseTree("\\sqrt}");
+        } catch (e) {
+            expect(e.position).toEqual(5);
+        }
+    });
+});