From: Michael Moen <mi-rubyforum@...>
Date: 2006-10-06T12:38:45+09:00
Subject: Re: Stripping unwanted html

Wild Al wrote:
> Hi everyone:
> 
> I'm trying to strip html with the exception of a few html tags.
> 
> I have found the following code:
> 
>   def strip_tags(html)
>     if html.index("<")
>       text = ""
>       tokenizer = HTML::Tokenizer.new(html)
> 
>       while token = tokenizer.next
>         node = HTML::Node.parse(nil, 0, 0, token, false)
>         # result is only the content of any Text nodes
>         text << node.to_s if node.class == HTML::Text
>       end
>       # strip any comments, and if they have a newline at the end (ie. 
> line with
>       # only a comment) strip that too
>       text.gsub(/<!--(.*?)-->[\n]?/m, "")
>     else
>       html # already plain text
>     end
> end
> 
> I'm trying to understand what is going on in this code but cannot find 
> documenation for HTML::Tokenizer or HTML::Node.parse.  Does anyone know 
> the use of the parameters in the parse method?
> 
> In the while loop, how do you access the html tag.  If I could access 
> the html tags, I could then decide if I wanted to keep the tag or not.
> 
> Thanks for reading,
> Wild Al

Al- I recently needed a parser similar to Perl's HTML::Scrubber. <a 
href="http://www.underpantsgnome.com/2006/09/09/using-hpricot-to-scrub-html/">This</a> 
is what I came up with , you may find it useful.

Michael

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