120 lines
3.2 KiB
PHP
120 lines
3.2 KiB
PHP
<?php
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namespace Activitypub;
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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_filter( 'wp_insert_post', array( self::class, 'insert_post' ), 10, 2 );
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\add_filter( 'the_content', array( self::class, 'the_content' ), 10, 2 );
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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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\wp_add_post_tags( $post->post_parent, $tags );
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}
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return $id;
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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 .= $chunk;
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continue;
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}
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if ( preg_match( '#^<(/)?([a-z-]+)\b[^>]*>$#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 );
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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[] = $tag;
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}
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// If we're in a protected tag, the tag_stack contains at least one protected tag string.
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// The protected tag state can only change when we encounter a start or end tag.
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$in_protected_tag = array_intersect( $tag_stack, $protected_tags );
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// Never inspect tags.
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$content_with_links .= $chunk;
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continue;
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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 .= $chunk;
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continue;
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}
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// Only reachable when there is no protected tag in the stack.
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$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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return $content_with_links;
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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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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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return '#' . $tag;
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}
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}
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