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Template.pm
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Template.pm
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# ABSTRACT: TODO
package Dancer::Core::Role::Template;
use Dancer::Core::Types;
use Dancer::FileUtils qw'path';
use Carp 'croak';
use Data::Dumper;
use Moo::Role;
with 'Dancer::Core::Role::Engine';
sub supported_hooks {
qw/
engine.template.before_render
engine.template.after_render
engine.template.before_layout_render
engine.template.after_layout_render
/;
}
requires 'render';
has name => (
is => 'ro',
lazy => 1,
builder => 1,
);
sub _build_name { (my $name = ref shift) =~ s/^Dancer::Template:://; $name; }
has charset => (
is => 'ro',
isa => Str,
default => sub {'UTF-8'},
);
has default_tmpl_ext => (
is => 'rw',
isa => Str,
default => sub {'tt'},
);
has views => (
is => 'rw',
isa => Maybe [Str],
);
has layout => (
is => 'rw',
isa => Maybe [Str],
);
has engine => (
is => 'ro',
isa => Object,
lazy => 1,
builder => 1,
);
sub _template_name {
my ($self, $view) = @_;
my $def_tmpl_ext = $self->default_tmpl_ext();
$view .= ".$def_tmpl_ext" if $view !~ /\.\Q$def_tmpl_ext\E$/;
return $view;
}
sub view {
my ($self, $view) = @_;
$view = $self->_template_name($view);
return path($self->views, $view);
}
sub render_layout {
my ($self, $layout, $tokens, $content) = @_;
my $layout_name = $self->_template_name($layout);
my $layout_path = path($self->views, 'layouts', $layout_name);
# FIXME: not sure if I can "just call render"
$self->render($layout_path, {%$tokens, content => $content});
}
sub apply_renderer {
my ($self, $view, $tokens) = @_;
$view = $self->view($view) if !ref $view;
$tokens = $self->_prepare_tokens_options($tokens);
$self->execute_hook('engine.template.before_render', $tokens);
my $content = $self->render($view, $tokens);
$self->execute_hook('engine.template.after_render', \$content);
# make sure to avoid ( undef ) in list context return
defined $content and return $content;
return;
}
sub apply_layout {
my ($self, $content, $tokens, $options) = @_;
$tokens = $self->_prepare_tokens_options($tokens);
# If 'layout' was given in the options hashref, use it if it's a true value,
# or don't use a layout if it was false (0, or undef); if layout wasn't
# given in the options hashref, go with whatever the current layout setting
# is.
my $layout =
exists $options->{layout}
? ($options->{layout} ? $options->{layout} : undef)
: ($self->layout || $self->context->app->config->{layout});
# that should only be $self->config, but the layout ain't there ???
defined $content or return;
defined $layout or return $content;
$self->execute_hook('engine.template.before_layout_render',
$tokens, \$content);
my $full_content = $self->render_layout($layout, $tokens, $content);
$self->execute_hook('engine.template.after_layout_render', \$full_content);
# make sure to avoid ( undef ) in list context return
defined $full_content and return $full_content;
return;
}
sub _prepare_tokens_options {
my ($self, $tokens) = @_;
# these are the default tokens provided for template processing
$tokens ||= {};
$tokens->{perl_version} = $];
$tokens->{dancer_version} = Dancer->VERSION;
if (defined $self->context) {
$tokens->{settings} = $self->context->app->config;
$tokens->{request} = $self->context->request;
$tokens->{params} = $self->context->request->params;
$tokens->{vars} = $self->context->buffer;
$tokens->{session} = $self->context->session->data
if $self->context->has_session;
}
return $tokens;
}
sub process {
my ($self, $view, $tokens, $options) = @_;
my ($content, $full_content);
# it's important that $tokens is not undef, so that things added to it via
# a before_template in apply_renderer survive to the apply_layout. GH#354
$tokens ||= {};
$options ||= {};
## FIXME - Look into PR 654 so we fix the problem here as well!
$content =
$view
? $self->apply_renderer($view, $tokens)
: delete $options->{content};
defined $content
and $full_content = $self->apply_layout($content, $tokens, $options);
defined $full_content
and return $full_content;
croak "Template did not produce any content";
}
1;