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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) 1996-2007 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::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) 1996-2007 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::Plugin> =cut # Local Variables: # mode: perl # perl-indent-level: 4 # indent-tabs-mode: nil # End: # # vim: expandtab shiftwidth=4:
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