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Edit File : Constants.pm \| Size : 4.35 KB
#================================================================= --Perl-- # # Template::Namespace::Constants # # DESCRIPTION # Plugin compiler module for performing constant folding at compile time # on variables in a particular namespace. # # AUTHOR # Andy Wardley <abw@wardley.org> # # COPYRIGHT # Copyright (C) 1996-2022 Andy Wardley. All Rights Reserved. # # This module is free software; you can redistribute it and/or # modify it under the same terms as Perl itself. # #============================================================================ package Template::Namespace::Constants; use strict; use warnings; use base 'Template::Base'; use Template::Config; use Template::Directive; use Template::Exception; our $VERSION = '3.100'; our $DEBUG = 0 unless defined $DEBUG; sub _init { my ($self, $config) = @_; $self->{ STASH } = Template::Config->stash($config) \|\| return $self->error(Template::Config->error()); return $self; } #------------------------------------------------------------------------ # ident(\@ident) foo.bar(baz) #------------------------------------------------------------------------ sub ident { my ($self, $ident) = @_; my @save = @$ident; # discard first node indicating constants namespace splice(@$ident, 0, 2); my $nelems = @$ident / 2; my ($e, $result); local $" = ', '; print STDERR "constant ident [ @$ident ] " if $DEBUG; foreach $e (0..$nelems-1) { # node name must be a constant unless ($ident->[$e * 2] =~ s/^'(.+)'$/$1/s) { $self->DEBUG(" * deferred (non-constant item: ", $ident->[$e * 2], ")\n") if $DEBUG; return Template::Directive->ident(\@save); } # if args is non-zero then it must be eval'ed if ($ident->[$e * 2 + 1]) { my $args = $ident->[$e * 2 + 1]; my $comp = eval "$args"; if ($@) { $self->DEBUG(" * deferred (non-constant args: $args)\n") if $DEBUG; return Template::Directive->ident(\@save); } $self->DEBUG("($args) ") if $comp && $DEBUG; $ident->[$e * 2 + 1] = $comp; } } $result = $self->{ STASH }->get($ident); if (! length $result \|\| ref $result) { my $reason = length $result ? 'reference' : 'no result'; $self->DEBUG(" * deferred ($reason)\n") if $DEBUG; return Template::Directive->ident(\@save); } $result =~ s/'/\\'/g; $self->DEBUG(" * resolved => '$result'\n") if $DEBUG; return "'$result'"; } 1; __END__ =head1 NAME Template::Namespace::Constants - Compile time constant folding =head1 SYNOPSIS # easy way to define constants use Template; my $tt = Template->new({ CONSTANTS => { pi => 3.14, e => 2.718, }, }); # nitty-gritty, hands-dirty way use Template::Namespace::Constants; my $tt = Template->new({ NAMESPACE => { constants => Template::Namespace::Constants->new({ pi => 3.14, e => 2.718, }, }, }); =head1 DESCRIPTION The C<Template::Namespace::Constants> module implements a namespace handler which is plugged into the C<Template::Directive> compiler module. This then performs compile time constant folding of variables in a particular namespace. =head1 METHODS =head2 new(\%constants) The new() constructor method creates and returns a reference to a new Template::Namespace::Constants object. This creates an internal stash to store the constant variable definitions passed as arguments. my $handler = Template::Namespace::Constants->new({ pi => 3.14, e => 2.718, }); =head2 ident(\@ident) Method called to resolve a variable identifier into a compiled form. In this case, the method fetches the corresponding constant value from its internal stash and returns it. =head1 AUTHOR Andy Wardley E<lt>abw@wardley.orgE<gt> L<http://wardley.org/> =head1 COPYRIGHT Copyright (C) 1996-2022 Andy Wardley. All Rights Reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =head1 SEE ALSO L<Template::Directive> =cut # Local Variables: # mode: perl # perl-indent-level: 4 # indent-tabs-mode: nil # End: # # vim: expandtab shiftwidth=4: Back

Edit File : Constants.pm | Size : 4.35 KB

#================================================================= -*-Perl-*-
#
# Template::Namespace::Constants
#
# DESCRIPTION
#   Plugin compiler module for performing constant folding at compile time
#   on variables in a particular namespace.
#
# AUTHOR
#   Andy Wardley   <abw@wardley.org>
#
# COPYRIGHT
#   Copyright (C) 1996-2022 Andy Wardley.  All Rights Reserved.
#
#   This module is free software; you can redistribute it and/or
#   modify it under the same terms as Perl itself.
#
#============================================================================

package Template::Namespace::Constants;

use strict;
use warnings;
use base 'Template::Base';
use Template::Config;
use Template::Directive;
use Template::Exception;

our $VERSION = '3.100';
our $DEBUG   = 0 unless defined $DEBUG;

sub _init {
    my ($self, $config) = @_;
    $self->{ STASH } = Template::Config->stash($config)
        || return $self->error(Template::Config->error());
    return $self;
}

#------------------------------------------------------------------------
# ident(\@ident)                                             foo.bar(baz)
#------------------------------------------------------------------------

sub ident {
    my ($self, $ident) = @_;
    my @save = @$ident;

# discard first node indicating constants namespace
    splice(@$ident, 0, 2);

my $nelems = @$ident / 2;
    my ($e, $result);
    local $" = ', ';

print STDERR "constant ident [ @$ident ] " if $DEBUG;

foreach $e (0..$nelems-1) {
        # node name must be a constant
        unless ($ident->[$e * 2] =~ s/^'(.+)'$/$1/s) {
            $self->DEBUG(" * deferred (non-constant item: ", $ident->[$e * 2], ")\n")
                if $DEBUG;
            return Template::Directive->ident(\@save);
        }

# if args is non-zero then it must be eval'ed
        if ($ident->[$e * 2 + 1]) {
            my $args = $ident->[$e * 2 + 1];
            my $comp = eval "$args";
            if ($@) {
                $self->DEBUG(" * deferred (non-constant args: $args)\n") if $DEBUG;
                return Template::Directive->ident(\@save);
            }
            $self->DEBUG("($args) ") if $comp && $DEBUG;
            $ident->[$e * 2 + 1] = $comp;
        }
    }

$result = $self->{ STASH }->get($ident);

if (! length $result || ref $result) {
        my $reason = length $result ? 'reference' : 'no result';
        $self->DEBUG(" * deferred ($reason)\n") if $DEBUG;
        return Template::Directive->ident(\@save);
    }

$result =~ s/'/\\'/g;

$self->DEBUG(" * resolved => '$result'\n") if $DEBUG;

return "'$result'";
}

__END__

=head1 NAME

Template::Namespace::Constants - Compile time constant folding

=head1 SYNOPSIS

# easy way to define constants
    use Template;

my $tt = Template->new({
        CONSTANTS => {
            pi => 3.14,
            e  => 2.718,
        },
    });

# nitty-gritty, hands-dirty way
    use Template::Namespace::Constants;

my $tt = Template->new({
        NAMESPACE => {
            constants => Template::Namespace::Constants->new({
                pi => 3.14,
                e  => 2.718,
            },
        },
    });

=head1 DESCRIPTION

The C<Template::Namespace::Constants> module implements a namespace handler
which is plugged into the C<Template::Directive> compiler module.  This then
performs compile time constant folding of variables in a particular namespace.

=head1 METHODS

=head2 new(\%constants)

The new() constructor method creates and returns a reference to a new
Template::Namespace::Constants object.  This creates an internal stash
to store the constant variable definitions passed as arguments.

my $handler = Template::Namespace::Constants->new({
        pi => 3.14,
        e  => 2.718,
    });

=head2 ident(\@ident)

Method called to resolve a variable identifier into a compiled form.  In this
case, the method fetches the corresponding constant value from its internal
stash and returns it.

=head1 AUTHOR

Andy Wardley E<lt>abw@wardley.orgE<gt> L<http://wardley.org/>

=head1 COPYRIGHT

This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

=head1 SEE ALSO

L<Template::Directive>

=cut

# Local Variables:
# mode: perl
# perl-indent-level: 4
# indent-tabs-mode: nil
# End:
#
# vim: expandtab shiftwidth=4:

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