/usr/lib/x86_64-linux-gnu/perl5/5.26/Template/Namespace/Constants.pm is in libtemplate-perl 2.27-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | #================================================================= -*-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) 1996-2007 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 = 1.27;
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) 1996-2007 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
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# mode: perl
# perl-indent-level: 4
# indent-tabs-mode: nil
# End:
#
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