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#============================================================= -*-Perl-*-
#
# Template::Plugin::HTML
#
# DESCRIPTION
# Template Toolkit plugin providing useful functionality for generating
# HTML.
#
# 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::Plugin::HTML;
use strict;
use warnings;
use base 'Template::Plugin';
our $VERSION = '3.100';
sub new {
my ($class, $context, @args) = @_;
my $hash = ref $args[-1] eq 'HASH' ? pop @args : { };
bless {
_SORTED => $hash->{ sorted } || 0,
attributes => $hash->{ attributes } || $hash->{ attrs } || { },
}, $class;
}
sub element {
my ($self, $name, $attr) = @_;
($name, $attr) = %$name if ref $name eq 'HASH';
return '' unless defined $name and length $name;
$attr = $self->attributes($attr);
$attr = " $attr" if $attr;
return "<$name$attr>";
}
sub closed_element {
my ($self, $name, $attr) = @_;
($name, $attr) = %$name if ref $name eq 'HASH';
return '' unless defined $name and length $name;
$attr = $self->attributes( $attr );
$attr = " $attr" if $attr;
return "<$name$attr />";
}
sub attributes {
my ($self, $hash) = @_;
$hash ||= $self->{ attributes };
return '' unless ref $hash eq 'HASH';
my @keys = keys %$hash;
@keys = sort @keys if $self->{ _SORTED };
join(' ', map {
"$_=\"" . $self->escape( $hash->{ $_ } ) . '"';
} @keys);
}
sub add_attributes {
my ($self, $attr) = @_;
return unless ref $attr eq 'HASH';
my $cur = $self->{ attributes };
for (keys %{$attr}) {
$cur->{$_} = exists $cur->{$_}
? $cur->{$_} . " $attr->{$_}"
: $attr->{$_};
}
return;
}
*add_attribute = \&add_attributes;
*add = \&add_attributes;
sub replace_attributes {
my ($self, $attr) = @_;
return unless ref $attr eq 'HASH';
my $cur = $self->{ attributes };
for (keys %{$attr}) {
$cur->{$_} = $attr->{$_};
}
return;
}
*replace_attribute = \&replace_attributes;
*replace = \&replace_attributes;
sub clear_attributes {
my $self = shift;
$self->{ attributes } = { };
return;
}
sub escape {
my ($self, $text) = @_;
for ($text) {
s/&/&/g;
s/</</g;
s/>/>/g;
s/"/"/g;
}
$text;
}
sub url {
my ($self, $text) = @_;
return undef unless defined $text;
$text =~ s/([^a-zA-Z0-9_.-])/uc sprintf("%%%02x",ord($1))/eg;
return $text;
}
1;
__END__
=head1 NAME
Template::Plugin::HTML - Plugin to create HTML elements
=head1 SYNOPSIS
[% USE HTML %]
[% HTML.escape("if (a < b && c > d) ..." %]
[% HTML.element(table => { border => 1, cellpadding => 2 }) %]
[% HTML.attributes(border => 1, cellpadding => 2) %]
=head1 DESCRIPTION
The C<HTML> plugin is a very basic plugin, implementing a few useful
methods for generating HTML.
=head1 METHODS
=head2 escape(text)
Returns the source text with any HTML reserved characters such as
C<E<lt>>, C<E<gt>>, etc., correctly escaped to their entity equivalents.
=head2 attributes(hash)
Returns the elements of the hash array passed by reference correctly
formatted (e.g. values quoted and correctly escaped) as attributes for
an HTML element.
=head2 add_attribute(attributes)
This provides a way to incrementally add attributes to the object.
The values passed in are stored in the object. Calling
L<element> with just a tag or L<attributes> without an parameters
will used the saved attributes.
USE tag = HTML;
tag.add_attributes( { class => 'navbar' } );
tag.add_attributes( { id => 'foo' } );
tag.add_attributes( { class => 'active' } );
tag.element( 'li' ); # <li class="navbar active" id="foo">
This method has two aliases: add_attribute() and add().
=head2 replace_attribute(attributes)
This will replace an attribute value instead of add to existing.
USE tag = HTML;
tag.add_attributes( { class => 'navbar' } );
tag.add_attributes( { id => 'foo' } );
tag.replace_attributes( { class => 'active' } );
tag.element( 'li' ); # <li class="active" id="foo">
This method has two aliases: replace_attribute() and replace().
=head2 clear_attributes
Clears any saved attributes
=head2 element(type, attributes)
Generates an HTML element of the specified type and with the attributes
provided as an optional hash array reference as the second argument or
as named arguments.
[% HTML.element(table => { border => 1, cellpadding => 2 }) %]
[% HTML.element('table', border=1, cellpadding=2) %]
[% HTML.element(table => attribs) %]
=head1 DEBUGGING
The HTML plugin accepts a C<sorted> option as a constructor argument
which, when set to any true value, causes the attributes generated by
the C<attributes()> method (either directly or via C<element()>) to be
returned in sorted order. Order of attributes isn't important in
HTML, but this is provided mainly for the purposes of debugging where
it is useful to have attributes generated in a deterministic order
rather than whatever order the hash happened to feel like returning
the keys in.
[% USE HTML(sorted=1) %]
[% HTML.element( foo => { charlie => 1, bravo => 2, alpha => 3 } ) %]
generates:
<foo alpha="3" bravo="2" charlie="1">
=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::Plugin>
=cut
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