Re: Parser interface design

[Simon Wright <simon@pushface.org>]

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".