<?php
/*
Plugin Name: Align RSS Images
Plugin URI: http://w-shadow.com/blog/2008/12/31/aligning-images-in-rss-feeds/
Description: Makes image alignment work in RSS feeds.  
Version: 1.1
Author: Janis Elsts
Author URI: http://w-shadow.com/blog/
*/

/*
Created by Janis Elsts (email : whiteshadow@w-shadow.com) 
It's LGPL.
*/

$explicit_alignment_styles = array(
		'alignleft' => 'float: left;',
		'alignright' => 'float: right;',
		'aligncenter' => 'display: block; margin-right: auto; margin-left: auto;',
		'centered' => 'display: block; margin-right: auto; margin-left: auto;',
		'img.alignleft' => 'padding: 4px; margin: 0 7px 2px 0;',
		'img.alignright' => 'padding: 4px; margin: 0 0 2px 7px;',
		'wp-caption' => 'border: 1px solid #dddddd; background-color: #f3f3f3; padding-top: 4px; margin: 10px; text-align:center;',
		'p.wp-caption-text' => 'padding: 0 4px 5px; margin: 0;',
	);

function ws_add_alignment_styles($matches){
	global $explicit_alignment_styles;
	$tag = strtolower($matches[1]);
	
	//Find the class attribute
	if (preg_match('/class=(["\'])(.+?)\1/i', $matches[0], $classdata)){
		$classes = preg_split('/\s+/',$classdata[2]);
	} else {
		return $matches[0];
	}
	
	//Generate the appropriate inline style
	$style = "";
	foreach ($classes as $class){
		if (isset($explicit_alignment_styles[$class])){
			$style .= " ".$explicit_alignment_styles[$class];
		}
		if (isset($explicit_alignment_styles[$tag.'.'.$class])){
			$style .= " ".$explicit_alignment_styles[$tag.'.'.$class];
		}
	}
	
	if (empty($style)){
		return $matches[0];
	}
	
	//Find the original style attribute, if any
	if ( preg_match('/style=(["\'])(.*?)\1/i', $matches[0], $styledata) ){
		//Add the style info to the attribute
		$result = str_replace($styledata[0], "style={$styledata[1]}{$styledata[2]}; {$style}{$styledata[1]}", $matches[0]);
	} else {
		//Insert a new style attribute
		$result = str_replace('<'.$matches[1],"<$tag style='$style' ", $matches[0]);
	}
	
	return $result;
	
}

function ws_align_rss_images($content){
	if ( is_feed() ) {
		$content = preg_replace_callback('/<(div|img|p|span).*?>/i', 'ws_add_alignment_styles', $content);
	}
	return $content;
}
add_filter('the_content','ws_align_rss_images',10000);

?>