From 9f0c545addb02a91719adec336200a991599280f Mon Sep 17 00:00:00 2001
From: Jacob Kaplan-Moss <jacob@jacobian.org>
Date: Mon, 12 Mar 2007 14:01:44 +0000
Subject: [PATCH] Added a YAML serializer built on PyYAML (http://pyyaml.org/).
 This serializer will only be enabled if PyYAML is installed, so I've not
 written any unit tests until I figure out how to make them work similarly.
 Still, the serializer is just a thin layer over the base Python serializer,
 and seems to Just Work.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4712 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/core/serializers/__init__.py |  7 ++++++
 django/core/serializers/pyyaml.py   | 36 +++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 django/core/serializers/pyyaml.py

diff --git a/django/core/serializers/__init__.py b/django/core/serializers/__init__.py
index f20258c416..494393f3cf 100644
--- a/django/core/serializers/__init__.py
+++ b/django/core/serializers/__init__.py
@@ -25,6 +25,13 @@ BUILTIN_SERIALIZERS = {
     "json"   : "django.core.serializers.json",
 }
 
+# Check for PyYaml and register the serializer if it's available.
+try:
+    import yaml
+    BUILTIN_SERIALIZERS["yaml"] = "django.core.serializers.pyyaml"
+except ImportError:
+    pass    
+
 _serializers = {}
         
 def register_serializer(format, serializer_module):
diff --git a/django/core/serializers/pyyaml.py b/django/core/serializers/pyyaml.py
new file mode 100644
index 0000000000..f45a511e79
--- /dev/null
+++ b/django/core/serializers/pyyaml.py
@@ -0,0 +1,36 @@
+"""
+YAML serializer.
+
+Requires PyYaml (http://pyyaml.org/), but that's checked for in __init__.
+"""
+
+import datetime
+from django.core.serializers.python import Serializer as PythonSerializer
+from django.core.serializers.python import Deserializer as PythonDeserializer
+try:
+    from cStringIO import StringIO
+except ImportError:
+    from StringIO import StringIO
+import yaml
+
+class Serializer(PythonSerializer):
+    """
+    Convert a queryset to JSON.
+    """
+    def end_serialization(self):
+        yaml.dump(self.objects, self.stream, **self.options)
+        
+    def getvalue(self):
+        return self.stream.getvalue()
+
+def Deserializer(stream_or_string, **options):
+    """
+    Deserialize a stream or string of JSON data.
+    """
+    if isinstance(stream_or_string, basestring):
+        stream = StringIO(stream_or_string)
+    else:
+        stream = stream_or_string
+    for obj in PythonDeserializer(yaml.load(stream)):
+        yield obj
+