Re: HTML processing

   From: "Trever L. Adams" <[email protected]>

   I am thinking of using CRM114 for a project. I have a few questions,
   only one of which do I think I know the answer to.

   1) Can CRM114 be used as a library or do I have to have it run as a
   daemon running my code and connect via sockets? (I believe the answer is
   the latter.)

The latter. 

Why?  Because CRM114's internal data model is that of overlapped
strings; no other language (that I know of) allows such flagrant
abuse of strings, let alone encourages this behavior as "good style".


   2) Is it possible to process HTML such that I remove all HTML tags BUT
   keep the content of the CONTENT part of META tags and ALT and TITLE
   content from <IMG>? If so, how?

Yes.

I assume you mean something like this; turn:

   <b> foo </b>
   <le> bar </le>
   <title> My web page </title>
   <img src="./my_photo.jpg" alt="What I look like" title="My Portrait">
   <meta NAME="description" CONTENT="user"> I assume there is text here
   <p>
   This is my text
   <p>

should get turned into:

   foo
   bar
   My web page
   alt="What I look like" title="My Portrait"
   NAME="description" CONTENT="user" I assume there is text here
   This is my text
   
which is moderately easy to do.  I guess it should not be
more than fifteen lines.

Try this...  DANGER ***UNTESTED CODE*** DANGER !!!

{
    #  Turn all of the content of META tags into inline text
    {
	match <nocase> /<meta ([^>]*)>/ (:whole_meta_tag: :meta_txt:)
	alter (:whole_meta_tag:) /:*:meta_txt:/
	liaf
    }
    #  Keep only the alt and title sections of an IMG tag
    {
	isolate (:img_txt: :alt_txt:)
	match <nocase>  /<img ([^>]*)>/  (:whole_img_tag:)
	{
	    match <nocase> [:whole_img_tag:] /img=[[:graph:]]*/ (:img_txt:)
	}
	{
	    match <nocase> [:whole_img_tag:] /alt=[[:graph:]]*/ (:alt_txt:)
	}
  	alter (:whole_img_tag:) / :*:img_txt: :*:alt_txt: /
	liaf
    }
    #   Get rid of every other tag, without mercy!
    {
	match <nocase> /<[^>]*>/ (:some_tag:)
	alter (:some_tag:) //
	liaf
    }
    accept
}

That at least is a good start on it.

     - Bill Yerazunis

    

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