On Sun, Dec 11, 2011 at 12:08 AM, Michael Orlitzky
I'm trying to migrate one my programs from the old HaXml API to the new. Please, someone save me.
I'm currently stuck with this, which works in 1.13. All of the filters work on Content, so I make some from the root element with the "root_elem = CElem root" line.
-- |Takes an XML String as an argument, and returns the -- status that was parsed from it. Should only be used -- on XML string where a <status> is a top-level element. parse_status :: String -> [Status] parse_status xml_data = catMaybes maybe_status where (Document _ _ root _) = xmlParse xml_file_name xml_data root_elem = CElem root status_element = (single_status root_elem) maybe_status = map status_from_content status_element
In the new API, xmlParse returns the root element with type (Element i) rather than just Element. And the Content constructor I have to use is (CElem (Element i) i), but I have no way to pass the correct 'i' to it.
It looks like the function 'xmlParse' returns a value of type 'Document Posn', according to the API docs. I'm guessing the 'Posn' value is used to annotate the position in the source document a particular piece of XML came from, so you can report errors better. Since the pretty-printing functions ignore it, you can replace it with whatever you want, even with a value of a different type if you have a need to annotate the tree.
I just want to parse a few elements from an XML file.
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