Add support for using xml:lang values.

Support is only for adding literal XML content
to stanzas. Full support for things like multiple
message bodies with different xml:lang values is
still in the works.

sleekxmpp/xmlstream/stanzabase.py

@@ -116,6 +116,9 @@ class ElementBase(object):
                              associated plugin stanza classes.
         plugin_tag_map    -- A mapping of plugin stanza tag names with
                              the associated plugin stanza classes.
+        xml_ns            -- The XML namespace,
+                             http://www.w3.org/XML/1998/namespace,
+                             for use with xml:lang values.
 
     Instance Attributes:
         xml               -- The stanza's XML contents.
@@ -144,7 +147,7 @@ class ElementBase(object):
         _get_attr          -- Return an attribute's value from the main
                               stanza element.
         _get_sub_text      -- Return the text contents of a subelement.
-        _set_sub_ext       -- Set the text contents of a subelement.
+        _set_sub_text      -- Set the text contents of a subelement.
         _del_sub           -- Remove a subelement.
         match              -- Compare the stanza against an XPath expression.
         find               -- Return subelement matching an XPath expression.
@@ -170,6 +173,7 @@ class ElementBase(object):
     plugin_attrib_map = {}
     plugin_tag_map = {}
     subitem = None
+    xml_ns = 'http://www.w3.org/XML/1998/namespace'
 
     def __init__(self, xml=None, parent=None):
         """

sleekxmpp/xmlstream/tostring/tostring.py

@@ -52,9 +52,18 @@ def tostring(xml=None, xmlns='', stanza_ns='', stream=None, outbuffer=''):
 
     # Output escaped attribute values.
     for attrib, value in xml.attrib.items():
-        if '{' not in attrib:
-            value = xml_escape(value)
+        value = xml_escape(value)
+        if '}' not in attrib:
             output.append(' %s="%s"' % (attrib, value))
+        else:
+            attrib_ns = attrib.split('}')[0][1:]
+            attrib = attrib.split('}')[1]
+            if stream and attrib_ns in stream.namespace_map:
+                mapped_ns = stream.namespace_map[attrib_ns]
+                if mapped_ns:
+                    output.append(' %s:%s="%s"' % (mapped_ns,
+                                                   attrib,
+                                                   value))
 
     if len(xml) or xml.text:
         # If there are additional child elements to serialize.

sleekxmpp/xmlstream/tostring/tostring26.py

@@ -55,9 +55,18 @@ def tostring(xml=None, xmlns='', stanza_ns='', stream=None, outbuffer=''):
 
     # Output escaped attribute values.
     for attrib, value in xml.attrib.items():
-        if '{' not in attrib:
-            value = xml_escape(value)
-            output.append(u' %s="%s"' % (attrib, value))
+        value = xml_escape(value)
+        if '}' not in attrib:
+            output.append(' %s="%s"' % (attrib, value))
+        else:
+            attrib_ns = attrib.split('}')[0][1:]
+            attrib = attrib.split('}')[1]
+            if stream and attrib_ns in stream.namespace_map:
+                mapped_ns = stream.namespace_map[attrib_ns]
+                if mapped_ns:
+                    output.append(' %s:%s="%s"' % (mapped_ns,
+                                                   attrib,
+                                                   value))
 
     if len(xml) or xml.text:
         # If there are additional child elements to serialize.

sleekxmpp/xmlstream/xmlstream.py

@@ -192,7 +192,7 @@ class XMLStream(object):
         self.send_queue = queue.Queue()
         self.scheduler = Scheduler(self.event_queue, self.stop)
 
-        self.namespace_map = {}
+        self.namespace_map = {StanzaBase.xml_ns: 'xml'}
 
         self.__thread = {}
         self.__root_stanza = []

tests/test_tostring.py

@@ -1,6 +1,6 @@
 from sleekxmpp.test import *
 from sleekxmpp.stanza import Message
-from sleekxmpp.xmlstream.stanzabase import ET
+from sleekxmpp.xmlstream.stanzabase import ET, ElementBase
 from sleekxmpp.xmlstream.tostring import tostring, xml_escape
 
 
@@ -110,5 +110,16 @@ class TestToString(SleekTest):
         self.failUnless(result == expected,
              "Stanza Unicode handling is incorrect: %s" % result)
 
+    def testXMLLang(self):
+        """Test that serializing xml:lang works."""
+
+        msg = self.Message()
+        msg._set_attr('{%s}lang' % msg.xml_ns, "no")
+
+        expected = '<message xml:lang="no" />'
+        result = msg.__str__()
+        self.failUnless(expected == result,
+            "Serialization with xml:lang failed: %s" % result)
+
 
 suite = unittest.TestLoader().loadTestsFromTestCase(TestToString)