Replace pegs parser with Esprima

It preserves comments and text positions, enabling us to do syntax
highlighting. Hopefully.

node_modules/esprima/demo/checkenv.js

@@ -0,0 +1,42 @@
+/*
+  Copyright (C) 2011 Ariya Hidayat <ariya.hidayat@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+// Unfortunately we have to use User Agent detection to blacklist the browsers.
+/*jslint browser:true */
+(function (window) {
+    'use strict';
+
+    var majorVersion = parseInt(window.platform.version.split('.')[0], 10);
+
+    window.checkEnv = function () {
+        if (window.platform.name === 'Safari' && majorVersion <= 3) {
+            throw new Error('CodeMirror does not support Safari <= 3');
+        }
+        if (window.platform.name === 'Opera' && majorVersion <= 8) {
+            throw new Error('CodeMirror does not support Opera <= 8');
+        }
+    };
+
+}(window));
+/* vim: set sw=4 ts=4 et tw=80 : */