Add a strawman Python implementation extension.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@965360 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 114 insertions, 0 deletions

diff --git a/sandbox/sebastien/java/dynamic/modules/implementation-python-runtime/src/main/resources/xmlutil.py b/sandbox/sebastien/java/dynamic/modules/implementation-python-runtime/src/main/resources/xmlutil.py
new file mode 100644
index 0000000000..a1bc04629a
--- /dev/null
+++ b/sandbox/sebastien/java/dynamic/modules/implementation-python-runtime/src/main/resources/xmlutil.py
@@ -0,0 +1,114 @@
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#  
+#    http://www.apache.org/licenses/LICENSE-2.0
+#    
+#  Unless required by applicable law or agreed to in writing,
+#  software distributed under the License is distributed on an
+#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#  KIND, either express or implied.  See the License for the
+#  specific language governing permissions and limitations
+#  under the License.
+
+# XML handling functions
+
+from StringIO import StringIO
+from xml.parsers import expat
+import xml.etree.ElementTree as et
+from util import *
+from elemutil import *
+
+# Read a list of XML attributes
+def readAttributes(a):
+    if a == ():
+        return a
+    return cons((attribute, "'" + car(car(a)), cadr(car(a))), readAttributes(cdr(a)))
+
+# Read an XML element
+def readElement(e):
+    l = (element, "'" + e.tag) + readAttributes(tuple(e.items())) + readElements(tuple(e.getchildren()))
+    if e.text == None:
+        return l
+    return l + (e.text,)
+
+# Read a list of XML elements
+def readElements(l):
+    if l == ():
+        return l
+    return cons(readElement(car(l)), readElements(cdr(l)))
+
+# Parse a list of strings representing an XML document
+class NamespaceParser(et.XMLTreeBuilder):
+    def __init__(self):
+        et.XMLTreeBuilder.__init__(self)
+        self._parser = parser = expat.ParserCreate(None)
+        parser.DefaultHandlerExpand = self._default
+        parser.StartElementHandler = self._start
+        parser.EndElementHandler = self._end
+        parser.CharacterDataHandler = self._data
+        try:
+            parser.buffer_text = 1
+        except AttributeError:
+            pass
+        try:
+            parser.ordered_attributes = 1
+            parser.specified_attributes = 1
+            parser.StartElementHandler = self._start_list
+        except AttributeError:
+            pass
+
+def parseXML(l):
+    s = StringIO()
+    writeStrings(l, s)
+    parser = NamespaceParser()
+    parser.feed(s.getvalue())
+    return parser.close()
+
+# Read a list of values from a list of strings representing an XML document
+def readXML(l):
+    e = parseXML(l)
+    return (readElement(e),)
+
+# Write a list of XML element and attribute tokens
+def expandElementValues(n, l):
+    if isNil(l):
+        return l
+    return cons(cons(element, cons(n, car(l))), expandElementValues(n, cdr(l)))
+
+def writeList(l, xml):
+    if isNil(l):
+        return xml
+    token = car(l)
+    if isTaggedList(token, attribute):
+        xml.attrib[attributeName(token)[1:]] = str(attributeValue(token))
+    elif isTaggedList(token, element):
+        if elementHasValue(token):
+            v = elementValue(token)
+            if isList(v):
+                e = expandElementValues(elementName(token), v)
+                writeList(e, xml)
+            else:
+                child = et.Element(elementName(token)[1:])
+                writeList(elementChildren(token), child)
+                xml.append(child)
+        else:
+            child = et.Element(elementName(token)[1:])
+            writeList(elementChildren(token), child)
+            xml.append(child)
+    else:
+        xml.text = str(token)
+    writeList(cdr(l), xml)
+    return xml
+
+# Convert a list of values to a list of strings representing an XML document
+def writeXML(l, xmlTag):
+    e = writeList(l, [])
+    if not xmlTag:
+        return (et.tostring(car(e)),)
+    return (et.tostring(car(e), "UTF-8") + "\n",)
+