Update third_party/handlebar/handlebar.py.

R=cduvall@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10535071

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@141147 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 16 insertions, 3 deletions

diff --git a/third_party/handlebar/README.chromium b/third_party/handlebar/README.chromium
index e057599..a0d7755 100644
--- a/third_party/handlebar/README.chromium
+++ b/third_party/handlebar/README.chromium
@@ -2,8 +2,8 @@ Name: Handlebar, logic-less templating system
 Short Name: handlebar
 URL: https://github.com/kalman/templates
 Version: 0
-Date: May 30, 2012
-Revision: commit 79b1d45
+Date: June 7, 2012
+Revision: commit 3397712d4bb91a5f5e25637580761f6c565a0cd6
 License: Apache License, Version 2.0
 Security Critical: no
 
diff --git a/third_party/handlebar/handlebar.py b/third_party/handlebar/handlebar.py
index d05e15e..a749ca9 100644
--- a/third_party/handlebar/handlebar.py
+++ b/third_party/handlebar/handlebar.py
@@ -30,6 +30,17 @@ input = {
   ]
 }
 print(template.render(input).text)
+
+Handlebar will use get() on contexts to return values, so to create custom
+getters (e.g. something that populates values lazily from keys) just add
+a get() method.
+
+class CustomContext(object):
+  def get(self, key):
+    return 10
+
+# Any time {{ }} is used, will fill it with 10.
+print(Handlebar('hello {{world}}').render(CustomContext()).text)
 """
 
 class ParseException(Exception):
@@ -82,7 +93,9 @@ class PathIdentifier(object):
   def _resolveFrom(self, context):
     result = context
     for next in self.path:
-      if not result or type(result) != dict:
+      # Only require that contexts provide a get method, meaning that callers
+      # can provide dict-like contexts (for example, to populate values lazily).
+      if not result or not getattr(result, "get", None):
         return None
       result = result.get(next)
     return result