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.\" ========================================================================
.\"
.IX Title "Template::Alloy::Compile 3pm"
.TH Template::Alloy::Compile 3pm "2013-09-20" "perl v5.18.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Template::Alloy::Compile \- Compile role \- allows for compiling the AST to perl code
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The Template::Alloy::Compile role allows for taking the \s-1AST\s0 returned
by the Parse role, and translating it into a perl code document.  This
is in contrast Template::Alloy::Play which executes the \s-1AST\s0 directly.
.SH "TODO"
.IX Header "TODO"
.IP "\(bu" 4
Translate compile_RAWPERL to actually output rather than calling play_RAWPERL.
.SH "ROLE METHODS"
.IX Header "ROLE METHODS"
.ie n .IP """compile_tree""" 4
.el .IP "\f(CWcompile_tree\fR" 4
.IX Item "compile_tree"
Takes an \s-1AST\s0 returned by parse_tree and translates it into
perl code using functions stored in the \f(CW$DIRECTIVES\fR hashref.
.Sp
A template that looked like the following:
.Sp
.Vb 4
\&    Foo
\&    [% GET foo %]
\&    [% GET bar %]
\&    Bar
.Ve
.Sp
would parse to the following perl code:
.Sp
.Vb 2
\&    # Generated by Template::Alloy::Compile v1.001 on Thu Jun  7 12:58:33 2007
\&    # From file /home/paul/bar.tt
\&
\&    my $blocks = {};
\&    my $meta   = {};
\&    my $code   = sub {
\&        my ($self, $out_ref, $var) = @_;
\&
\&        $$out_ref .= \*(AqFoo\*(Aq;
\&
\&        # "GET" Line 2 char 2 (chars 6 to 15)
\&        $var = $self\->play_expr([\*(Aqfoo\*(Aq, 0]);
\&        $$out_ref .= defined($var) ? $var : $self\->undefined_get([\*(Aqfoo\*(Aq, 0]);
\&
\&        # "GET" Line 3 char 2 (chars 22 to 31)
\&        $var = $self\->play_expr([\*(Aqbar\*(Aq, 0]);
\&        $$out_ref .= defined($var) ? $var : $self\->undefined_get([\*(Aqbar\*(Aq, 0]);
\&
\&        $$out_ref .= \*(AqBar\*(Aq;
\&
\&        return 1;
\&    };
\&
\&    {
\&        blocks => $blocks,
\&        meta   => $meta,
\&        code   => $code,
\&    };
.Ve
.Sp
As you can see the output is quite a bit more complex than the \s-1AST,\s0 but under
mod_perl conditions, the perl will run faster than playing the \s-1AST\s0 each time.
.ie n .IP """compile_expr""" 4
.el .IP "\f(CWcompile_expr\fR" 4
.IX Item "compile_expr"
Takes an \s-1AST\s0 variable or expression and returns perl code that can lookup
the variable.
.SH "AUTHOR"
.IX Header "AUTHOR"
Paul Seamons <paul@seamons.com>
.SH "LICENSE"
.IX Header "LICENSE"
This module may be distributed under the same terms as Perl itself.