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Manual Reference Pages  -  STRING::TT (3)

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String::TT - use TT to interpolate lexical variables



  use String::TT qw/tt strip/;

  sub foo {
     my $self = shift;
     return tt my name is [% %]!;

  sub bar {
     my @args = @_;
     return strip tt q{
        Args: [% args_a.join(",") %]


String::TT exports a tt function, which takes a TT (Template Toolkit) template as its argument. It uses the current lexical scope to resolve variable references. So if you say:

  my $foo = 42;
  my $bar = 24;

  tt [% foo %] <-> [% bar %];

the result will be 42 <-> 24.

TT provides a slightly less rich namespace for variables than perl, so we have to do some mapping. Arrays are always translated from @array to array_a and hashes are always translated from %hash to hash_h. Scalars are special and retain their original name, but they also get a scalar_s alias. Here’s an example:

  my $scalar = scalar;
  my @array  = qw/array goes here/;
  my %hash   = ( hashes => are fun );

  tt [% scalar %] [% scalar_s %] [% array_a %] [% hash_h %];

There is one special case, and that’s when you have a scalar that is named like an existing array or hash’s alias:

  my $foo_a = foo_a;
  my @foo   = qw/foo array/;

  tt [% foo_a %] [% foo_a_s %]; # foo_a is the array, foo_a_s is the scalar

In this case, the foo_a accessor for the foo_a scalar will not be generated. You will have to access it via foo_a_s. If you delete the array, though, then foo_a will refer to the scalar.

This is a very cornery case that you should never encounter unless you are weird. 99% of the time you will just use the variable name.


None by default, but strip and tt are available.


tt CW$template

Treats $template as a Template Toolkit template, populated with variables from the current lexical scope.

strip CW$text

Removes a leading empty line and common leading spaces on each line. For example,

  strip q{
    This is a test.
     This is indented.

Will yield the string "This is a test\n This is indented.\n".

This feature is designed to be used like:

  my $data = strip tt q{
      This is a [% template %].
      It is easy to read.

Instead of the ugly heredoc equivalent:

  my $data = tt <<EOTT;
This is a [% template %].
It looks like crap.


If you want to pass args to the TT engine, override the _build_tt_engine function:

  local *String::TT::_build_tt_engine = sub { return Template->new( ... ) }
  tt this uses my engine;


This module is hosted in the git repository. You can view the history in your web browser at:


and you can clone the repository by running:

  git clone git://

Patches welcome.


Jonathan Rockway


This module is copyright (c) 2008 Infinity Interactive. You may redistribute it under the same terms as Perl itself.
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perl v5.20.3 STRING::TT (3) 2010-06-11

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