From a1e443ad657fa44081e7445e3b7f4c2a3543a171 Mon Sep 17 00:00:00 2001
From: Kevin Albert <kevin.albert@productops.com>
Date: Thu, 29 Oct 2015 17:36:08 -0700
Subject: [PATCH 1/2] Brackets can be escaped

---
 js/syntree.js | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/js/syntree.js b/js/syntree.js
index e5ac5a3..05d8095 100644
--- a/js/syntree.js
+++ b/js/syntree.js
@@ -293,9 +293,14 @@ function go(str, font_size, term_font, nonterm_font, vert_space, hor_space, colo
 	// Clean up the string
 	str = str.replace(/^\s+/, "");
 	var open = 0;
+    var esc = false;
 	for (var i = 0; i < str.length; i++) {
-		if (str[i] == "[") open++;
-		if (str[i] == "]") open--;
+		if (!esc) {
+            if (str[i] == "[") open++;
+            else if (str[i] == "]") open--;
+            else if (str[i] == "\\") esc = true;
+        }
+        esc = false;
 	}
 	while (open < 0) {
 		str = "[" + str;
@@ -390,15 +395,16 @@ function parse(str) {
 			function(match, tail) {
 				n.tail = tail;
 				return " ";
-			});
-		str = str.replace(/^\s+/, "");
-		str = str.replace(/\s+$/, "");
+			})
+            .replace(/^\s+/, "")
+		    .replace(/\s+$/, "")
+            .replace(/\\([\[\]])/g, "$1");     
 		n.value = str;
 		return n;
 	}
 
 	var i = 1;
-	while ((str[i] != " ") && (str[i] != "[") && (str[i] != "]")) i++;
+	while ((str[i] != " ") && (str[i] != "[" || str[i-1] == "\\") && (str[i] != "]" || str[i-1] == "\\")) i++;
 	n.value = str.substr(1, i-1)
 	n.value = n.value.replace(/\^/, 
 		function () {
@@ -419,8 +425,8 @@ function parse(str) {
 		var start = i;
 		for (; i < str.length; i++) {
 			var temp = level;
-			if (str[i] == "[") level++;
-			if (str[i] == "]") level--;
+			if (str[i] == "[" && str[i-1] != "\\") level++;
+			if (str[i] == "]" && str[i-1] != "\\") level--;
 			if (((temp == 1) && (level == 2)) || ((temp == 1) && (level == 0))) {
 				if (str.substring(start, i).search(/[^\s]/) > -1)
 					n.children.push(parse(str.substring(start, i)));

From e205e28d3a98a437e3f2132b3be61374353abbaf Mon Sep 17 00:00:00 2001
From: Kevin Albert <kevin.albert@productops.com>
Date: Thu, 29 Oct 2015 17:47:33 -0700
Subject: [PATCH 2/2] .

---
 index.html | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/index.html b/index.html
index 40bdcb4..3636040 100644
--- a/index.html
+++ b/index.html
@@ -22,7 +22,7 @@
 	<a href="https://github.com/mshang/syntree"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_orange_ff7600.png" alt="Fork me on GitHub"></a>
 	<div id="accordion">
 		<h3><a href="#">Syntax Tree Generator</a></h3><div style="text-align:left">
-			<textarea id="i" rows="4">[S [NP This] [VP [V is] [^NP a wug]]]</textarea>
+			<textarea id="i" rows="4">[S [NP This] [VP [V \[is\]] [^NP a wug]]]</textarea>
 			(C) 2011 by <a href="http://mshang.ca/">Miles Shang</a>, see <a href="LICENSE.txt">license</a>.
 		</div>
 		
@@ -206,4 +206,4 @@ <h3>Examples</h3>
 </script>
 
 </body>
-</html>
\ No newline at end of file
+</html>