From cab5af40b6a63208c20fbca8aebce4b359604983 Mon Sep 17 00:00:00 2001
From: Ben Alpert <spicyjalapeno@gmail.com>
Date: Sun, 28 Jul 2013 17:53:48 -0700
Subject: [PATCH] Always throw real ParseErrors

Also sneak in a colon.

Auditors: emily
---
 Lexer.js  | 2 +-
 Parser.js | 4 ++--
 katex.js  | 3 ++-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/Lexer.js b/Lexer.js
index b1b07e09c..e06171d98 100644
--- a/Lexer.js
+++ b/Lexer.js
@@ -17,7 +17,7 @@ var normals = [
     [/^[/|@."`0-9]/, "textord"],
     [/^[a-zA-Z]/, "mathord"],
     [/^[*+-]/, "bin"],
-    [/^[=<>]/, "rel"],
+    [/^[=<>:]/, "rel"],
     [/^[,;]/, "punct"],
     [/^'/, "'"],
     [/^\^/, "^"],
diff --git a/Parser.js b/Parser.js
index 98e171031..b4f479ebb 100644
--- a/Parser.js
+++ b/Parser.js
@@ -130,7 +130,7 @@ Parser.prototype.parseAtom = function(pos) {
         var node;
         if ((node = this.parseSuperscript(nextPos))) {
             if (sup) {
-                throw "Parse error: Double superscript";
+                throw new ParseError("Parse error: Double superscript");
             }
             nextPos = node.position;
             sup = node.result;
@@ -138,7 +138,7 @@ Parser.prototype.parseAtom = function(pos) {
         }
         if ((node = this.parseSubscript(nextPos))) {
             if (sub) {
-                throw "Parse error: Double subscript";
+                throw new ParseError("Parse error: Double subscript");
             }
             nextPos = node.position;
             sub = node.result;
diff --git a/katex.js b/katex.js
index 34c4d972a..7b8dd4614 100644
--- a/katex.js
+++ b/katex.js
@@ -152,7 +152,8 @@ var buildGroup = function(style, color, group, prev) {
     } else if (group.type === "namedfn") {
         return makeSpan("mop" + color, [textit(group.value.slice(1))]);
     } else {
-        throw "Lex error: Got group of unknown type: '" + group.type + "'";
+        throw new ParseError(
+            "Lex error: Got group of unknown type: '" + group.type + "'");
     }
 };