I was taking a look at this the other day and I noticed that we can
actually use the `FreeT` idioms from `pipes-group` to provide a more
strongly typed interface to the XML document that preserves its nested
structure.
Right now, all the current XML libraries rely on generating a stream of
events which try to flatten the document into a linear stream. The
issue with this is that such a stream does not enforce the correct
nesting in the types and doesn't provide any good tools for manipulating
groups. With something like `pipes-group` we could actually represent
the XML as an actual nested data type that still streams all the data.
As a bonus, we could even use lenses to zoom in on tags and their
children, too.
I know that's probably more than what Jack had in mind, but I can
contribute the `FreeT` and lenses stuff myself if necessary.
On 02/14/2014 01:08 PM, Jack Henahan wrote:
I'm currently working on an attoparsec XML parser with the specific
goal of using it with pipes-attoparsec and hopefully turning it into a
pipes-xml kind of package. It's not anywhere near release ready, but
I'll try to put more serious effort into it since there's more interest.
But oh, god, XML is a nightmare.
On Feb 6, 2014, at 10:33 AM, Rodlogic <[email protected]
<mailto:[email protected]>> wrote:
I have been using pipes-http for the past few days and I am now at a
point where I need to parse xml responses. I don't need validations
and I don't need to parse the XML into a DOM but instead would like
to parse it directly into my own data structures (a la what existing
JSON parsers are doing in Haskell). And of course, sane dependencies
is also important.
Is there an existing lightweight xml parsing package that I could use
with pipes? If not, does it make sense to build one using pipes-parse?
I am somewhat new to Haskell, so any pointers are well appreciated.
thanks!
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