From b83ae95d90347d828ac7b4d281b42123c8ce7f08 Mon Sep 17 00:00:00 2001
From: Sam Stephenson <sam@37signals.com>
Date: Wed, 17 Oct 2007 14:14:27 +0000
Subject: [PATCH] prototype: Fix template evaluation with empty replacements. 
 Closes #9692.

---
 CHANGELOG             | 6 +++++-
 src/string.js         | 2 +-
 test/unit/string.html | 9 +++++++++
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG b/CHANGELOG
index 076be7e..59b8f25 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,9 +1,13 @@
-*1.6.0_rc1* (October 16, 2007)
+*SVN*
+
+* Fix template evaluation with empty replacements.  Closes #9692.  [Ryan McGeary]
 
 * Hash#toTemplateReplacements is an alias for Hash#toObject so you can once again pass hashes to Template#evaluate and String#interpolate.  [sam]
 
 * Fix Event#is(Left|Middle|Right)Click in IE.  Closes #7520 (again).  [Mislav Marohnić]
 
+*1.6.0_rc1* (October 16, 2007)
+
 * Ensure Event.* generic methods work in IE, even when the event is not extended. [Viktor Kojouharov, Andrew Dupont]
 
 * Don't translate "keypress" events into "keydown" events.  [sam]
diff --git a/src/string.js b/src/string.js
index 0a994e2..ff89433 100644
--- a/src/string.js
+++ b/src/string.js
@@ -246,7 +246,7 @@ var Template = Class.create({
       
       var ctx = object, expr = match[3];
       var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/, match = pattern.exec(expr);
-      if (match == null) return '';
+      if (match == null) return before;
 
       while (match != null) {
         var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
diff --git a/test/unit/string.html b/test/unit/string.html
index 9241e52..023b5bb 100644
--- a/test/unit/string.html
+++ b/test/unit/string.html
@@ -305,6 +305,15 @@
         template.evaluate({}));
     }},
 
+    testTemplateEvaluationWithEmptyReplacement: function() {with(this) {
+      var template = new Template('##{}');
+      assertEqual('#', template.evaluate({}));
+      assertEqual('#', template.evaluate({foo: 'bar'}));
+
+      template = new Template('#{}');
+      assertEqual('', template.evaluate({}));
+    }},
+
     testTemplateEvaluationWithFalses: function() {with(this) {
       var source = '<tr><td>#{zero}</td><td>#{false_}</td><td>#{undef}</td><td>#{null_}</td><td>#{empty}</td></tr>';
       var falses = {zero:0, false_:false, undef:undefined, null_:null, empty:""};