/**
* Put together the article body for this post
*
* @since 0.1
* @return string The content
*/
protected function _get_the_content()
{
// Try to get the content from a transient, but only if the cached version have the same modtime
$cache_mod_time = get_transient('instantarticles_mod_' . $this->get_the_ID());
if ($cache_mod_time == get_post_modified_time('Y-m-d H:i:s', true, $this->get_the_ID())) {
$content = get_transient('instantarticles_content_' . $this->get_the_ID());
if ($content !== false && strlen($content)) {
return $content;
}
}
global $post, $more;
// force $more
$orig_more = $more;
$more = 1;
// If we’re not it the loop or otherwise properly setup
$reset_postdata = false;
if ($this->get_the_ID() !== $post->ID) {
$post = get_post($this->get_the_ID());
setup_postdata($post);
$reset_postdata = true;
}
// Now get the content
$content = get_the_content();
/**
* Apply the default filter 'the_content' for the post content
*
* @since 0.1
* @param string $content The current post content.
*/
$content = apply_filters('the_content', $content);
// Maybe cleanup some globals after us?
$more = $orig_more;
if ($reset_postdata) {
wp_reset_postdata();
}
// Some people choose to disable wpautop. Due to the Instant Articles spec, we really want it in!
$content = wpautop($content);
/**
* Filter the post content for Instant Articles
*
* @since 0.1
* @param string $content The post content.
*/
$content = apply_filters('instant_articles_content', $content);
if (class_exists('DOMDocument') && has_action('instant_articles_register_dom_transformation_filters')) {
/* If we have filters that wants to work on the DOM, we generate one instance of DOMDocument
they can all work on, instead of having to handle the conversion themselves. */
$libxml_previous_state = libxml_use_internal_errors(true);
$DOMDocument = new DOMDocument('1.0', get_option('blog_charset'));
// DOMDocument isn’t handling encodings too well, so let’s help it a little
if (function_exists('mb_convert_encoding')) {
$content = mb_convert_encoding($content, 'HTML-ENTITIES', get_option('blog_charset'));
}
$result = $DOMDocument->loadHTML('<!doctype html><html><body>' . $content . '</body></html>');
libxml_clear_errors();
libxml_use_internal_errors($libxml_previous_state);
if ($result) {
// Register the DOM transformation filters if not done yet
if (!did_action('instant_articles_register_dom_transformation_filters')) {
do_action('instant_articles_register_dom_transformation_filters');
}
Instant_Articles_DOM_Transform_Filter_Runner::run($DOMDocument, $this->get_the_ID());
$body = $DOMDocument->getElementsByTagName('body')->item(0);
$filtered_content = '';
foreach ($body->childNodes as $node) {
$filtered_content .= $DOMDocument->saveXML($node);
}
$content = $filtered_content;
unset($filtered_content);
}
}
// Cache the content
set_transient('instantarticles_mod_' . $this->get_the_ID(), get_post_modified_time('Y-m-d H:i:s', true, $this->get_the_ID()), WEEK_IN_SECONDS);
set_transient('instantarticles_content_' . $this->get_the_ID(), $content, WEEK_IN_SECONDS);
return $content;
}
/**
* Register included DOM transformation filters
*
* @since 0.1
*/
function instant_articles_register_transformation_filters()
{
include dirname(__FILE__) . '/dom-transform-filters/class-instant-articles-dom-transform-filter-video.php';
Instant_Articles_DOM_Transform_Filter_Runner::register('Instant_Articles_DOM_Transform_Filter_Video');
include dirname(__FILE__) . '/dom-transform-filters/class-instant-articles-dom-transform-filter-image.php';
Instant_Articles_DOM_Transform_Filter_Runner::register('Instant_Articles_DOM_Transform_Filter_Image');
include dirname(__FILE__) . '/dom-transform-filters/class-instant-articles-dom-transform-filter-blockquote.php';
Instant_Articles_DOM_Transform_Filter_Runner::register('Instant_Articles_DOM_Transform_Filter_Blockquote');
include dirname(__FILE__) . '/dom-transform-filters/class-instant-articles-dom-transform-filter-unordered-list.php';
Instant_Articles_DOM_Transform_Filter_Runner::register('Instant_Articles_DOM_Transform_Filter_Unordered_List');
include dirname(__FILE__) . '/dom-transform-filters/class-instant-articles-dom-transform-filter-ordered-list.php';
Instant_Articles_DOM_Transform_Filter_Runner::register('Instant_Articles_DOM_Transform_Filter_Ordered_List');
include dirname(__FILE__) . '/dom-transform-filters/class-instant-articles-dom-transform-filter-table.php';
Instant_Articles_DOM_Transform_Filter_Runner::register('Instant_Articles_DOM_Transform_Filter_Table');
include dirname(__FILE__) . '/dom-transform-filters/class-instant-articles-dom-transform-filter-address.php';
Instant_Articles_DOM_Transform_Filter_Runner::register('Instant_Articles_DOM_Transform_Filter_Address');
//Instant articles only support h1 and h2. Convert h3-h6 to h2.
include dirname(__FILE__) . '/dom-transform-filters/class-instant-articles-dom-transform-filter-heading.php';
Instant_Articles_DOM_Transform_Filter_Runner::register('Instant_Articles_DOM_Transform_Filter_Heading');
// Remove empty elements
include dirname(__FILE__) . '/dom-transform-filters/class-instant-articles-dom-transform-filter-emptyelements.php';
Instant_Articles_DOM_Transform_Filter_Runner::register('Instant_Articles_DOM_Transform_Filter_Emptyelements');
}
