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Text::Template::Preprocess.3pm

NAME

Text::Template::Preprocess - Expand template text with embedded Perl

VERSION

This file documents "Text::Template::Preprocess" version 1.44

SYNOPSIS

  use Text::Template::Preprocess;
 
  my $t = Text::Template::Preprocess->new(...);  # identical to Text::Template
 
  # Fill in template, but preprocess each code fragment with pp().
  my $result = $t->fill_in(..., PREPROCESSOR => \&pp);
 
  my $old_pp = $t->preprocessor(\&new_pp);
 
 

DESCRIPTION

"Text::Template::Preprocess" provides a new "PREPROCESSOR" option to "fill_in". If the "PREPROCESSOR" option is supplied, it must be a reference to a preprocessor subroutine. When filling out a template, "Text::Template::Preprocessor" will use this subroutine to preprocess the program fragment prior to evaluating the code.

The preprocessor subroutine will be called repeatedly, once for each program fragment. The program fragment will be in $_. The subroutine should modify the contents of $_ and return. "Text::Template::Preprocess" will then execute contents of $_ and insert the result into the appropriate part of the template.

"Text::Template::Preprocess" objects also support a utility method, "preprocessor()", which sets a new preprocessor for the object. This preprocessor is used for all subsequent calls to "fill_in" except where overridden by an explicit "PREPROCESSOR" option. "preprocessor()" returns the previous default preprocessor function, or undefined if there wasn't one. When invoked with no arguments, "preprocessor()" returns the object's current default preprocessor function without changing it.

In all other respects, "Text::Template::Preprocess" is identical to "Text::Template".

WHY?

One possible purpose: If your files contain a lot of JavaScript, like this:

         Plain text here...
         { perl code }
         <script language=JavaScript>
               if (br== "n3") { 
                   // etc.
               }
         </script>
         { more perl code }
         More plain text...
 
 

You don't want "Text::Template" to confuse the curly braces in the JavaScript program with executable Perl code. One strategy:

         sub quote_scripts {
           s(<script(.*?)</script>)(q{$1})gsi;
         }
 
 

Then use "PREPROCESSOR => \&quote_scripts". This will transform

SEE ALSO

Text::Template

AUTHOR

Mark-Jason Dominus, Plover Systems

Please send questions and other remarks about this software to "mjd-perl-template+@plover.com"

You can join a very low-volume (<10 messages per year) mailing list for announcements about this package. Send an empty note to "mjd-perl-template-request@plover.com" to join.

For updates, visit "http://www.plover.com/~mjd/perl/Template/".

LICENSE

     Text::Template::Preprocess version 1.44
     Copyright (C) 2003 Mark Jason Dominus
 
     This program is free software; you can redistribute it and/or
     modify it under the terms of the GNU General Public License as
     published by the Free Software Foundation; either version 2 of the
     License, or (at your option) any later version.  You may also can
     redistribute it and/or modify it under the terms of the Perl
     Artistic License.
 
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
     You should have received copies of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.