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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: What is the best license to use for open source software?
Date: Thu, 29 Jan 2015 09:50:46 +0100
Organization: cbb software GmbH
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Date: 2015-01-29T09:50:46+01:00
List-Id: <comp.lang.ada>

On Wed, 28 Jan 2015 23:03:24 -0800 (PST), Vadim Godunko wrote:

> On Tuesday, January 27, 2015 at 11:52:28 AM UTC+3, Dmitry A. Kazakov wrote:
>> 
>> One basic issue more, should the template paradigm be:
>> 
>> A. Substitution-based (some escape sequences in the text);
>> B. Language-based;
>> C. Programmable (some API to manipulate the template, plus intermediate
>> embeddable code, plus GUI editor).
>> 
> Matreshka includes templates engine that uses XML format for templates and
> handles substitutions and conditional processing. Generated output can be
> XML or optimized HTML (when template uses HTML namespace). See
> 
> http://forge.ada-ru.org/matreshka/wiki/XML/Templates
> 
> Source template not necessary should be file: it can be any stream of
> stream elements or sequence of 'markup events' - elements of internal
> representation of XML document.

That would be A, while I prefer C. E.g. instead of XML:

   <mtl:if expression="boolean_expression">
     ...
   </mtl:if>

Ada's:

   ... & (if Condition then ... else Null_Text end if) & ...

or simply

   ... & Condition * ... & ...

Some set of types HTML_* with operations like "&", "*" etc. Thus no parser,
maybe, parameter binder. Serialize/deserialize for keeping it in a file or
in a database.

I would also try to declare HTML elements as typed constants. The idea is
to ensure the resulted HTML page being correct (e.g. matched elements <b>
</b>) for any set of actual parameters. One flaw of the approaches A and B
is that there is no way to do this.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de