94 lines
2.4 KiB
PHP
94 lines
2.4 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( '\Activitypub\Hashtag', 'insert_post' ), 10, 2 );
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\add_filter( 'the_content', array( '\Activitypub\Hashtag', '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( $the_content ) {
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$protected_tags = array();
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$protect = function( $m ) use ( &$protected_tags ) {
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$c = count( $protected_tags );
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$protect = '!#!#PROTECT' . $c . '#!#!';
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$protected_tags[ $protect ] = $m[0];
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return $protect;
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};
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$the_content = preg_replace_callback(
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'#<!\[CDATA\[.*?\]\]>#is',
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$protect,
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$the_content
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);
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$the_content = preg_replace_callback(
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'#<(pre|code|textarea|style)\b[^>]*>.*?</\1[^>]*>#is',
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$protect,
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$the_content
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);
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$the_content = preg_replace_callback(
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'#<[^>]+>#i',
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$protect,
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$the_content
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);
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$the_content = \preg_replace_callback( '/' . ACTIVITYPUB_HASHTAGS_REGEXP . '/i', array( '\Activitypub\Hashtag', 'replace_with_links' ), $the_content );
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$the_content = str_replace( array_reverse( array_keys( $protected_tags ) ), array_reverse( array_values( $protected_tags ) ), $the_content );
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return $the_content;
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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="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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