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<?php |
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namespace Activitypub; |
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|
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/** |
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* ActivityPub Hashtag Class |
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* |
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* @author Matthias Pfefferle |
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*/ |
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class Hashtag { |
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/** |
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* Initialize the class, registering WordPress hooks |
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*/ |
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public static function init() { |
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if ( '1' === \get_option( 'activitypub_use_hashtags', '1' ) ) { |
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\add_action( 'wp_insert_post', array( self::class, 'insert_post' ), 10, 2 ); |
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\add_filter( 'the_content', array( self::class, 'the_content' ), 10, 1 ); |
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} |
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} |
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|
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/** |
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* Filter to save #tags as real WordPress tags |
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* |
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* @param int $id the rev-id |
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* @param WP_Post $post the post |
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* |
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* @return |
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*/ |
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public static function insert_post( $id, $post ) { |
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if ( \preg_match_all( '/' . ACTIVITYPUB_HASHTAGS_REGEXP . '/i', $post->post_content, $match ) ) { |
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$tags = \implode( ', ', $match[1] ); |
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|
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\wp_add_post_tags( $post->post_parent, $tags ); |
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} |
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|
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return $id; |
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} |
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|
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/** |
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* Filter to replace the #tags in the content with links |
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* |
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* @param string $the_content the post-content |
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* |
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* @return string the filtered post-content |
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*/ |
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public static function the_content( $the_content ) { |
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// small protection against execution timeouts: limit to 1 MB |
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if ( mb_strlen( $the_content ) > MB_IN_BYTES ) { |
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return $the_content; |
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} |
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$tag_stack = array(); |
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$protected_tags = array( |
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'pre', |
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'code', |
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'textarea', |
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'style', |
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'a', |
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); |
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$content_with_links = ''; |
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$in_protected_tag = false; |
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foreach ( wp_html_split( $the_content ) as $chunk ) { |
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if ( preg_match( '#^<!--[\s\S]*-->$#i', $chunk, $m ) ) { |
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$content_with_links .= $chunk; |
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continue; |
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} |
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|
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if ( preg_match( '#^<(/)?([a-z-]+)\b[^>]*>$#i', $chunk, $m ) ) { |
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$tag = strtolower( $m[2] ); |
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if ( '/' === $m[1] ) { |
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// Closing tag. |
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$i = array_search( $tag, $tag_stack, true ); |
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// We can only remove the tag from the stack if it is in the stack. |
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if ( false !== $i ) { |
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$tag_stack = array_slice( $tag_stack, 0, $i ); |
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} |
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} else { |
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// Opening tag, add it to the stack. |
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$tag_stack[] = $tag; |
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} |
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|
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// If we're in a protected tag, the tag_stack contains at least one protected tag string. |
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// The protected tag state can only change when we encounter a start or end tag. |
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$in_protected_tag = array_intersect( $tag_stack, $protected_tags ); |
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|
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// Never inspect tags. |
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$content_with_links .= $chunk; |
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continue; |
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} |
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|
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if ( $in_protected_tag ) { |
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// Don't inspect a chunk inside an inspected tag. |
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$content_with_links .= $chunk; |
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continue; |
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} |
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|
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// Only reachable when there is no protected tag in the stack. |
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$content_with_links .= \preg_replace_callback( '/' . ACTIVITYPUB_HASHTAGS_REGEXP . '/i', array( '\Activitypub\Hashtag', 'replace_with_links' ), $chunk ); |
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} |
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|
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return $content_with_links; |
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} |
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|
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/** |
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* A callback for preg_replace to build the term links |
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* |
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* @param array $result the preg_match results |
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* @return string the final string |
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*/ |
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public static function replace_with_links( $result ) { |
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$tag = $result[1]; |
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$tag_object = \get_term_by( 'name', $tag, 'post_tag' ); |
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|
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if ( $tag_object ) { |
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$link = \get_term_link( $tag_object, 'post_tag' ); |
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return \sprintf( '<a rel="tag" class="hashtag u-tag u-category" href="%s">#%s</a>', $link, $tag ); |
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} |
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|
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return '#' . $tag; |
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} |
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} |
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|
