Added basic iterwrite support

streamxmlwriter.py

@@ -355,3 +355,28 @@ def close(self):
         """Close all open elements."""
         while self._tags:
             self.end()
+
+    def iterwrite(self, events):
+        for event, elem in events:
+            if event == "start-ns":
+                self.start_ns(*elem)
+            elif event == "end-ns":
+                self.end_ns()
+            elif event == "comment":
+                self.comment(elem.text)
+                if elem.tail:
+                    self.data(elem.tail)
+            elif event == "pi":
+                self.pi(elem.target, elem.text)
+                if elem.tail:
+                    self.data(elem.tail)
+            elif event == "start":
+                self.start(elem.tag, dict(elem.attrib))
+                if elem.text:
+                    self.data(elem.text)
+            elif event == "end":
+                self.end(elem.tag)
+                if elem.tail:
+                    self.data(elem.tail)
+                elem.clear()
+

test/test_streamxmlwriter.py

@@ -280,6 +280,25 @@ def testAttributesSameLocalOnePrefixedOneDefault(self):
                           '</foo>')
 
 
+class IterwriteTestCase(unittest.TestCase):
+    def testBasic(self):
+        from lxml import etree
+        from cStringIO import StringIO
+        w, out = writer_and_output()
+        xml = """\
+<!--comment before--><?pi before?><foo xmlns="http://example.org/ns1">
+  <?a pi?>
+  <bar xmlns:b="http://example.org/ns2">
+    <?pi inside?>some text
+    <baz attr="1" b:attr="2" />
+    oh dear<!--comment inside -->text here too
+  </bar>
+</foo><?pi after?><!--comment after-->"""
+        events = ("start", "end", "start-ns", "end-ns", "pi", "comment")
+        w.iterwrite(etree.iterparse(StringIO(xml), events))
+        w.close()
+        self.assertEqual(out.getvalue(), xml)
+
 # from lxml import etree
 # 
 # rmt = etree.parse("test/xmlconf/eduni/namespaces/1.0/rmt-ns10.xml")