Re: idiom for iterating

On Wed, 22 Apr 2009 16:25:43 +0200
Thomas Michael Hagen <[email protected]> wrote:

> i have resorted to this clumsy hack:
> 
> 	match (:: :url: :text: :next-url:) [:file:] /(#http:.*?CET
> ....)(.*?)(#http:|$)/
> 	isolate (:article:) /:*:url::*:text:/
> 	call /:main:/ [:*:article:]
> 	{
>  	    match <fromnext> (:: :url: :text: :next-url:) [:file:]
> /(#http:.*?CET ....)(.*?)(#http:|$)/
> 	    isolate (:article:) /:*:url::*:text:/
> 	    call /:main:/ [:*:article:]
> 	    liaf
> 	}
> 
> there must be a better way than duplicating all that code, right?

Try "match [:file:] (::) /^/" before going into your loop. That will
position the string pointer to the begining of the variable... or you
can spend some hours combing through your code to see if your opening
marker ended up as part of another match prior to this section of code.

It's always so much easier to solve others problems than your own. I
have a similar parsing situation involving a flatfile user registration
database that contains user-formated data. Not even all the email
(Email:|E-mail:) fields have the same label! The only field that I can
parse on is the "User:" field at the begining of the record. My first
draft used an idiom like: 

	{
	match (:: :record:) /(User:.+?)User/
	# Do stuff
	alter (:record:) //
	liaf
	}

Chris

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