Re: [WebMacro-user] A WM brain bender

[Alex Twisleton-Wykeham-F. <al...@fi...>]

On Friday 11 March 2005 13:41, Alex Twisleton-Wykeham-Fiennes wrote:
<Snip>

> > It's a bit confusing. I'd like to not have to write a helper/directive
> > to load a Macro tempalte from a String unless I have to...
>
> Would it not be possible to have an implementation of TemplateProvider that
> used the name of the template as the contents of the template itself?
>
> This would let you say:-
>
> #include as template "<p>Hello, $name</p>"
>
> or
>
> #include as template "$templateSource"
>
> Of course, this would rather cripple your normal template loading, so there
> could be a switch which looked for a given header such as:-
>
> #include as template "evaluate:$templateSource"
>
> and if it didn't start with "evaluate:" then it would just delegate the
> request to the default template loader.

Actually I was a bit wrong.  What you want is a TemplateLoader.  Here is proof 
of concept:-

package org.cord.node;

import org.webmacro.*;
import org.webmacro.engine.*;
import org.webmacro.resource.*;

public class EvaluatingTemplateLoader
  extends AbstractTemplateLoader 
{
  public void setConfig(String config) 
  {
  }

  public Template load(String query,
                       CacheElement ce) 
    throws ResourceException
  {
    return new StringTemplate(broker,
                              query);
  }
}

Then put this in your template evaluater:-

TemplateLoaderPath.n=evaluate:
TemplateLoader.evaluate=org.cord.node.EvaluatingTemplateLoader

where n is higher than any other TemplateLoaderPath to ensure that it doesn't 
jump on other templates.

and then you can do:-

#include as template "<p>Hello, \$name</p>"

note that the escape of the $ in the passed template is necessary to prevent 
it getting prematurely evaluated...

You can now do the same thing off variables like so:-

#set $templateSource = "<p>Hello, \$name</p>"
#include as template "$templateSource"

and this all works fine...

Alex

ps thought that it would be funky to be able to chain these like so:-
#include as template "#include as text "<normalTemplatePath>""
but WebMacro obviously thinks that this is on crack...