diff -r 22d16c457d87 -r 3b19c34bac04 PLCControler.py
--- a/PLCControler.py	Thu Sep 17 14:17:52 2009 -0600
+++ b/PLCControler.py	Fri Sep 18 09:41:27 2009 -0600
@@ -596,6 +596,51 @@
                 self.Project.insertpou(-1, new_pou)
                 self.BufferProject()
     
+    def PastePou(self, pou_type, pou_xml):
+        '''
+        Adds the POU defined by 'pou_xml' to the current project with type 'pou_type'
+        '''
+        try:
+            tree = minidom.parseString(pou_xml)
+            root = tree.childNodes[0]
+        except:
+            return _("Couldn't paste non-POU object.")
+
+        if root.nodeName == "pou":
+            new_pou = plcopen.pous_pou()
+            new_pou.loadXMLTree(root)
+
+            name = new_pou.getname()
+            orig_type = new_pou.getpouType()
+
+            # prevent violations of POU content restrictions:
+            # function blocks cannot be pasted as functions,
+            # programs cannot be pasted as functions or function blocks
+            if orig_type == 'functionBlock' and pou_type == 'function' or \
+            orig_type == 'program' and pou_type in ['function', 'functionBlock']:
+                return _('''%s "%s" can't be pasted as a %s.''') % (orig_type, name, pou_type)
+ 
+            while self.Project.getpou(name):
+                # a POU with that name already exists.
+                # make a new name and test if a POU with that name exists.
+
+                # append an incrementing numeric suffix to the POU name. it
+                # doesn't count up perfectly, but as long as it's unique who cares?
+                if name[-1] >= '0' and name[-1] <= '9':
+                    last_digit = int(name[-1])
+                    name = name[0:-1] + str(last_digit+1)
+                else:
+                    name = name + '1'
+
+            # we've found a name that does not already exist, use it
+            new_pou.setname(name)
+            new_pou.setpouType(pou_type)
+
+            self.Project.insertpou(-1, new_pou)
+            self.BufferProject()
+        else:
+            return _("Couldn't paste non-POU object.")
+
     # Remove a Pou from project
     def ProjectRemovePou(self, pou_name):
         if self.Project is not None:
@@ -1647,6 +1692,9 @@
                 if root.nodeType == tree.ELEMENT_NODE and root.nodeName == "paste":
                     for child in root.childNodes:
                         if child.nodeType == tree.ELEMENT_NODE:
+                            if not child.nodeName in plcopen.ElementNameToClass:
+                                return _("\"%s\" element can't be pasted here!!!")%child.nodeName
+
                             classname = plcopen.ElementNameToClass[child.nodeName]
                             if not self.CheckPasteCompatibility[bodytype](classname):
                                 return _("\"%s\" element can't be pasted here!!!")%child.nodeName