[plt-scheme] Need help with struct:html

Use xml->xexpr

-- Matthias


On Sep 23, 2004, at 7:05 PM, Brian Beckman wrote:

>   For list-related administrative tasks:
>   http://list.cs.brown.edu/mailman/listinfo/plt-scheme
>
> Hello, all -- I've successfully read a (rather large) block of HTML
> via code that looks like this:
>
> (require (lib "html.ss" "html"))
>
> (define s (read-html (open-input-file "C:\\Documents and
> Settings\\bcbeckman\\My Documents\\testData\\myfile.html")))
>
> (define v (struct->vector ssccSep2004))
>
> (define x
>   (read-html-as-xml
>    (open-input-file "C:\\Documents and Settings\\bcbeckman\\My
> Documents\\testData\\myfile.html")))
>
> The trouble is that I can't figure out how to get at any of the
> information.  If I just try to print s, v, or x, I get the unhelpful
> #<struct:html>, #2(struct:html ...), and (#<struct:pcdata>
> #<struct:pcdata> #<struct:element> #<struct:pcdata>), respectively.
> Looking at the html library documentation in HelpDesk gives me the
> following...
>
> --- begin quote ---
>
> Pcdata, Entity, and Attribute are defined in the XML documentation.
>
>> Html-content = Html-element | Pcdata | Entity
>
>> Html-element = any of the structures below which all inherit from
>   (define-struct html-element (attributes)).  Any html tag that may
>   include content also inherits from
>   (define-struct (html-full struct:html-element) (content))
>   without adding any additional fields.
>
> A Html is
> (make-html (listof Attribute) (listof Contents-of-html))
>
> A Contents-of-html is either
>   - Body
>   - Head
>
> ...
>
> --- end quote ---
>
> so, I try things like
>
> (html-Html-content s)
> (html-content s)
> (Html-content s)
> (html-element s)
> (Html-element s)
> (html-Html-element s)
> (html-Body s)
> (html-Contents-of-html s)
> (Contents-of-html s)
>
> and so on ... getting nothing but errors of various kinds, mostly
> "undefined identifier".
>
> Obviously, I am very confused.  My uneducated guesswork has gotten me
> nowhere.  Any hints for me?