Here's the original code for the prolog parser that I have:
[[
prolog :: XParser Prolog
prolog = do
x <- maybe xmldecl
many misc
dtd <- maybe doctypedecl
many misc
return (Prolog x dtd)
]]It's clear from this that the PIs (and comments) are parsed and discarded, so your change to capture these in the prolog makes sense.
#g --
[1] http://www.ninebynine.org/Software/HaskellUtils/HaXml-1.12/ (My modified version.)
At 00:44 28/10/04 -0400, S. Alexander Jacobson wrote:
I modified the Prolog type to be
data Prolog = Prolog (Maybe XMLDecl) [Misc] (Maybe DocTypeDecl) [Misc]
and then modified the Prolog parser (which actually was correct) to actually use the misc values in constucting the Prolog. I replace the prolog function in pretty.hs with
prolog (Prolog x m1 dtd m2) = maybe xmldecl x $$ vcat (map misc m1) $$ maybe doctypedecl dtd $$ vcat (map misc m2)
and did a few more similar things in Haskell2XML and XML2Haskell (about a 5 min operation) and it all seems to work properly.
Implementation question: Why is there so much replicated code in HaXML/Html (parse.hs and pretty.hs)
Given that this fix was so very easy and given that the parser was already spec consistent, I now have to assume that there was good reason for the Prolog to be spec inconsistent, but I don't know what it is...
Thoughts?
-Alex-
On Wed, 27 Oct 2004, S. Alexander Jacobson wrote:
> The XML spec defines the prolog(1) as follows:
>
> [22] prolog ::= XMLDecl? Misc* (doctypedecl Misc*)?
>
> In other words you can have Misc before AND after
> the doctype declaration!
>
> HaXml defines the prolog(2) as:
>
> data Prolog = Prolog (Maybe XMLDecl) (Maybe DocTypeDecl)
>
> HaXml therefore does not allow PIs before the
> beginning of the top level element. This is a
> problem in practice for people who want to use
> e.g. XML-Stylesheets(3) where if one is using XSL
> to produce HTML it is necessary to put
> the stylesheet declaration BEFORE the root element
> (if the root element is not HTML). e.g.
>
> <?xml version="1.0"?>
> <?xml:stylesheet type="text/xsl" href="style.xsl"?>
> <foo id="57" category="2"/>
>
> Is there some way to puta PI before the
> root element in combinators?
>
> -Alex-
>
> (1) http://www.w3.org/TR/REC-xml/#sec-prolog-dtd
> (2) http://www.cs.york.ac.uk/fp/HaXml/HaXml/Text.XML.HaXml.Types.html#Prolog
> (3) http://www.w3.org/TR/xml-stylesheet/
> ______________________________________________________________
> S. Alexander Jacobson tel:917-770-6565 http://alexjacobson.com
> _______________________________________________
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>
______________________________________________________________ S. Alexander Jacobson tel:917-770-6565 http://alexjacobson.com _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
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