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| <?php | |
| /** | |
| * Plugin Name: Syntax-highlighting Code Comments | |
| * Plugin URI: https://gist.github.com/westonruter/d35a909df087d90e0100d111eed77faa | |
| * Description: Extension plugin for Syntax-highlighting Code Block to also add syntax highlighting to code in comments. | |
| * Version: 0.1.1 | |
| * Author: Weston Ruter | |
| * Author URI: https://weston.ruter.net/ | |
| * License: GPL2 | |
| * License URI: https://www.gnu.org/licenses/gpl-2.0.html | |
| * Text Domain: syntax-highlighting-code-block | |
| * Requires PHP: 5.6 | |
| * Gist Plugin URI: https://gist.github.com/westonruter/d35a909df087d90e0100d111eed77faa | |
| * | |
| * @package Syntax_Highlighting_Code_Comments | |
| */ | |
| namespace Syntax_Highlighting_Code_Comments; | |
| use WP_Block_Type; | |
| use WP_Block_Type_Registry; | |
| /** | |
| * Make <code>...</code> in (comment) text syntax-highlighted. | |
| * | |
| * The <code> element may be optionally wrapped in a <pre> tags, and then start and end on a line by itself. In other | |
| * words it must be presented as a block/paragraph and not inline; when <code> appears inline in paragraphs, it will | |
| * not be syntax-highlighted. | |
| * | |
| * @param string $comment_text Comment text. | |
| * @return string Syntax-highlighted. | |
| */ | |
| function filter_comment_text( $comment_text ) { | |
| if ( ! function_exists( '\Syntax_Highlighting_Code_Block\render_block' ) ) { | |
| return $comment_text; | |
| } | |
| $registry = WP_Block_Type_Registry::get_instance(); | |
| $block_type = $registry->get_registered( 'core/code' ); | |
| if ( ! $block_type instanceof WP_Block_Type ) { | |
| return $comment_text; | |
| } | |
| $attributes = []; | |
| foreach ( $block_type->attributes as $name => $schema ) { | |
| if ( isset( $schema['default'] ) ) { | |
| $attributes[ $name ] = $schema['default']; | |
| } | |
| } | |
| $pattern = implode( | |
| '', | |
| [ | |
| '(?<=^|\n)', | |
| '(<pre[^>]*?>\s*)?', | |
| '<code[^>]*?>(?P<contents>[^<]*?)</code>', | |
| '(\s*</pre>)?', | |
| '(?=\r?\n|$)', | |
| ] | |
| ); | |
| return preg_replace_callback( | |
| "#{$pattern}#si", | |
| static function( $matches ) use ( $attributes ) { | |
| $contents = $matches['contents']; | |
| $before = '<pre><code>'; | |
| $after = '</code></pre>'; | |
| return \Syntax_Highlighting_Code_Block\render_block( $attributes, $before . $contents . $after ); | |
| }, | |
| $comment_text | |
| ); | |
| } | |
| add_filter( 'comment_text', __NAMESPACE__ . '\filter_comment_text', 20 ); |
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