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Re^3: RFC : Abstraction Markup

by yitzchak (Sexton)
on Jul 13, 2011 at 01:53 UTC ( #914050=note: print w/ replies, xml ) Need Help??


in reply to Re^2: RFC : Abstraction Markup
in thread RFC : Abstraction Markup

I don't understand; what is the handler for the DB tag actually passed? The raw text contained in it, <query>, etc. and all?


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Re^4: RFC : Abstraction Markup
by Anonymous Monk on Jul 13, 2011 at 10:24 UTC
    From my understanding it boils down to  $DB->($query, $mask) Where query is sql and mask is a template, and $DB is a function that basically does
    my $sth = $dbh->prepare($query); $sth->execute; $out = ''; foreach my $queryResult( $sth->fetchrow_hashref ) $out .= $mask->process( $queryResult ) } return $out;
    Except he chose delimiters to be different and significant -- which is why he had to use regular expressions to parse his xml-ish balanced tags, instead of using XML::Twig or HTML::Seamstress

    To do the same in TT2, you create a template DB which uses Template::Plugin::DBI so you can write

    <table width="50%"> [% MACRO mask BLOCK %] <tr> <td> [% news_title %] </td> <td> [% news_headline %] </td> <td>[% WRAPPER link action = "readnews" newsitem = news_id %]Read More...[% END # block test %] </td> </tr> [% END # macro block mask %] [% INCLUDE DB ## db calls macro mask, can be redefined query=' SELECT * FROM latestnews; ' %] </table>
    query is a variable, mask is macro ( a template ) , and the template DB calls the macro mask, after defining variables based on database column names (presumably news_id, news_title, news_headline ) to populate mask

    This works out of the box with TT2.

    Sure, you have to define the MACRO mask before INCLUDE-ing the template DB, but that could be remedied by expanding the syntax so you can assign macros to a variable, or it could be implemented as a Template::Plugin or Template::View -- not a lot of work

      I think you misunderstood my question. From what I can tell, this is supposed to be completely generic, being able to attach handlers to any "tag" (or have it pass through verbatim if there is no handler), with each handler receiving its children as content and returning a rendered version. With <> tags, child content has already been processed, but handling of () tags is supposed to take precedence over their children; does that mean the contents of a () tag aren't subject to any handlers? Or that upon return of the () tag handler, any tags in the return are handled? Other?

        I think you misunderstood my question

        I don't think I did :) I explained how the given template example unravels in both perl and tt2 terms

        does that mean the contents of a () tag aren't subject to any handlers?

        I don't understand what you're asking :)

        Based on his actual proof of concept (both old, new) "(DB)" "DB" is the name of plugin, its perl code, either ...DB.aXMLpl or ...DB.pm

        Since (DB) has no () children, it is processed first, as a complete unit

        Its responsible for processing all tags contained within as a template

        Or that upon return of the () tag handler, any tags in the return are handled? Other?

        Lets try another , shorter example

        (Foo) <Fruit>Apples</Fruit> (Bar) <pants>red</pants><d>varyable</d> (/Bar) (/Foo)
        That would be functionally equivalent to this perl code
        return $Foo->( '<Fruit>Apples</Fruit>' .$Bar->('<pants>red</pants><d>varyable</d>') );

        Like chromatic said, its basically scheme

        Am I closer now?

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