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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Parser interface design
Date: Fri, 08 Apr 2011 20:59:14 +0100
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Date: 2011-04-08T20:59:14+01:00
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Natasha Kerensikova <lithiumcat@gmail.com> writes:

>> Don't see what's wrong with providing a No_Op function which returns its
>> input unchanged? unless you do something specific for a null?
>
> Yes, as I said in my reply to Dmitry, I thought of disabling in the
> parser the feature associated to a callback set to null. In the
> "foo *bar* baz" example I provided, using a No_Op for Emphasis would
> result in "<p>foo  baz</p>", while disabling the emphasis feature means
> considering the star as an inactive character, resulting in
> "<p>foo *bar* baz</p>".

I had in mind more that using my No_Op (I think it was Georg who used
the better name Identity) would result in "<p>foo bar baz</p>".

In other words, HTML.Emphasize ("bar") would return "<b>bar</b>", but
No_Op ("bar") would just return "bar".