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class-eab-markdown-filter-plugin.php
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class-eab-markdown-filter-plugin.php
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<?php // namespace Nfreear\WP_EAB_Plugins;
/**
* Plugin Name: EAB-Markdown Lite
* Plugin URI: https://github.com/nfreear/wp-eab-plugins#markdown-filter
* Description: Filter to convert HTML headings, paragraphs and links to text (Markdown text). (Supports PHP 5.2.x)
* Author: Nick Freear
* Author URI: https://github.com/nfreear
* Version: 1.0.0-alpha
*
* @package Nfreear\WP_EAB_Plugins
* @copyright © Nick Freear, 12-, 31-March-2018.
*
* @link https://github.com/thephpleague/html-to-markdown
* @link https://github.com/nfreear/html-to-markdown
*/
class Eab_Markdown_Filter_Plugin {
const FILTER = 'the_content_markdown';
const WORD_WRAP = 76;
public function __construct() {
add_filter( self::FILTER, array( &$this, self::FILTER ) );
}
public function the_content_markdown( $content ) {
// global $wp;
$content = self::convert_headings_atx( $content );
$content = self::convert_links( $content );
$content = self::convert_paragraphs_etc( $content );
return wordwrap( $content, self::WORD_WRAP );
}
protected static function convert_headings_atx( $content ) {
return preg_replace_callback(
'/<h(?P<level>[1-6]).*?>(?P<heading>.+?)<\/h\d>/',
array( __CLASS__, 'atx_headings_callback' ),
/* function ( $matches ) {
return "\n" . str_repeat( '#', $matches['level'] ) . ' ' . $matches['heading'] . "\n";
}, */
$content
);
}
protected static function atx_headings_callback( $matches ) {
return "\n" . str_repeat( '#', $matches['level'] ) . ' ' . $matches['heading'] . "\n";
}
public static function convert_links( $content ) {
return preg_replace_callback(
'/<a href="(?P<url>.+)">(?P<text>.+?)<\/a>/',
array( __CLASS__, 'links_callback' ),
/* function ( $matches ) {
$url = str_replace( '&', '&', $matches['url'] );
return '[' . $matches['text'] . '](' . $url . ')';
}, */
$content
);
}
protected static function links_callback( $matches ) {
$url = str_replace( '&', '&', $matches['url'] );
return '[' . $matches['text'] . '](' . $url . ')';
}
protected static function convert_paragraphs_etc( $content ) {
$content = str_replace( '</p>', "\n", $content );
$content = preg_replace( '/<(p|\/?div|br).*?>/', '', $content );
return $content;
}
}
$plugin = new Eab_Markdown_Filter_Plugin();