From dd2564e64cf609ca80cd551bd035e1d02b2825b3 Mon Sep 17 00:00:00 2001
From: Joel Burget <joel@khanacademy.org>
Date: Mon, 3 Nov 2014 14:56:46 -0800
Subject: [PATCH] Stop silencing useful information.

The thrown errors didn't hold any useful information and made debugging
impossible.

Before:

    Error: Could not parse jison grammar

After:

    Error: Parse error on line 86:
    ...   ;expatom    = atom '^' nat
    --------------------^
    Expecting ':', got 'ID'
---
 lib/cli.js | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/lib/cli.js b/lib/cli.js
index 4bd502528..1d14faabc 100755
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -160,21 +160,13 @@ cli.processGrammars = function processGrammars(file, lexFile, jsonMode) {
     var ebnfParser = require('ebnf-parser');
     var cjson = require('cjson');
     var grammar;
-    try {
-        if (jsonMode) {
-            grammar = cjson.parse(file);
-        } else {
-            grammar = ebnfParser.parse(file);
-        }
-    } catch (e) {
-        throw new Error('Could not parse jison grammar');
+    if (jsonMode) {
+        grammar = cjson.parse(file);
+    } else {
+        grammar = ebnfParser.parse(file);
     }
-    try {
-        if (lexFile) {
-            grammar.lex = require('lex-parser').parse(lexFile);
-        }
-    } catch (e) {
-        throw new Error('Could not parse lex grammar');
+    if (lexFile) {
+        grammar.lex = require('lex-parser').parse(lexFile);
     }
     return grammar;
 };