Flip CSS to RTL version

flipcss.php

<?php
/* 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * flipcss.php 0.4
 * by daif alotaibi (http://daif.net)
 * [email protected]
 * 
 * Link:
 *  http://daif.net/script/flipcss.phps
 * 
 * Description:
 *  This Tool flip CSS rules direction from LTR to RTL or vice versa .
 *  tool support these CSS rules: float, text-align, padding, margin
 *  and border-radius .
 * 
 * Syntax:
 *  right to left
 *  FlipTheCSSFile('path_to_css_file', 'RTL');
 *  left to right
 *  FlipTheCSSFile('path_to_css_file', 'LTR');
 * 
 * Changelog
 * 0.1  first release
 * 0.2  rewrite padding and margin
 * 0.3	support border-radius
 * 0.4	add GPL License
*/
	
	
	
	FlipTheCSSFile('css/bootstrap.css', 'RTL');
	FlipTheCSSFile('css/bootstrap-responsive.css', 'RTL');
	
	
	
	function FlipTheCSSFile($css_file, $dir='RTL') {
		$css_data = file_get_contents($css_file);
		//remove comments 
		$css_data = preg_replace('/\/\*(.*)?\*\//Usi','' ,$css_data);
		//rewrite padding,margin 
		$css_data = preg_replace('/(\h*)(padding|margin):(.+)\h+(.+)\h+(.+)\h+(.+)\h*;/Ui',"\\1\\2-right:\\4;\\1\\2-left:\\5;" ,$css_data);
		//rewrite border-radius 
		$css_data = preg_replace('/(\h*|)border-radius:(.+)\h+(.+)\h+(.+)\h+(.+)\h*;/Ui',"\\1border-top-left-radius:\\2;\\1border-top-".
					"right-radius:\\3;\\1border-bottom-right-radius:\\4;\\1border-bottom-left-radius:\\5;", $css_data);
		//start parsing css file
		$css_data = preg_replace('/(@media .+){(.+)}\s*}/Uis', '\1$\2}$', $css_data);
		preg_match_all('/(.+){(.+)(}\$|})/Uis', $css_data, $css_arr);
		$css_flipped	= "/* Created by flipcss.php 0.4 by daif alotaibi (http://daif.net) */\n\nbody{\n\tdirection:$dir;\n}\n\n";
		foreach($css_arr[0] as $key=>$val) {
			if(preg_match('/left|right/i', $css_arr[2][$key])) { // TODO: direction rule 
				if($rules = FlipTheCSSRules($css_arr[2][$key])) {
					$css_flipped .= trim(str_replace('$','{',$css_arr[1][$key]));
					$css_flipped .= " {\n\t".trim($rules)."\n";
					$css_flipped .= str_replace('$',"\n}",$css_arr[3][$key])."\n\n";
				}
			}
		}
		file_put_contents(substr($css_file,0,-4).'-'.strtolower($dir).'.css', $css_flipped);
		print "CSS File $css_file has been flipped to $dir direction.<br />\n";
	}
	
	function FlipTheCSSRules($rules) {
		$return         = '';
		$rules_arr      = explode(";", $rules);
		foreach($rules_arr as $rule) {
			//ignore rules that doesn't need flipping
			if(preg_match('/(left|right)/i', $rule)) {
				//flip float
				if(preg_match('/float\h*:\h*(.+)/i', $rule, $rule_arr)) {
					$rule = 'float: '.((trim($rule_arr[1])=='left')?'right':'left');
					$return .="\t".trim($rule).";\n";
				
				//flip text-align
				} elseif(preg_match('/text-align\h*:\h*(.+)/i', $rule, $rule_arr)) {
					$rule = 'text-align: '.((trim($rule_arr[1])=='left')?'right':'left');
					$return .="\t".trim($rule).";\n";
				
				//flip padding, margin
				} elseif(preg_match('/(\*|)(margin|padding)-(left|right)\h*:\h*(.+)/i', $rule, $rule_arr)) {
					$dir = ((trim($rule_arr[3])=='left')?'right':'left');
					//reset direction rule
					if((trim($rule_arr[3]) == 'left' && !preg_match('/'.trim($rule_arr[2]).'\-right/i', $rules)) || (trim($rule_arr[2]) == 'right' && !preg_match('/'.trim($rule_arr[2]).'\-left/i', $rules))) {
						$rule = trim($rule_arr[1]).trim($rule_arr[2]).'-'.$rule_arr[3].": 0;\n\t";
					} else {
						$rule = '';
					}
					$rule .= trim($rule_arr[1]).trim($rule_arr[2]).'-'.$dir.': '.$rule_arr[4];
					$return .="\t".trim($rule).";\n";
				
				//flip border-radius
				} elseif(preg_match('/border-(top|bottom)-(left|right)-radius\h*:\h*(.+)/i', $rule, $rule_arr)) {
					$dir = ((trim($rule_arr[2])=='left')?'right':'left');
					//reset direction rule
					if((trim($rule_arr[2]) == 'left' && !preg_match('/'.trim($rule_arr[1]).'\-right/i', $rules)) || (trim($rule_arr[2]) == 'right' && !preg_match('/'.trim($rule_arr[1]).'\-left/i', $rules))) {
						$rule = 'border-'.$rule_arr[1].'-'.$rule_arr[2].'-radius: 0;'."\n\t";
					} else {
						$rule = '';
					}
					//write new direction rule
					$rule .= 'border-'.$rule_arr[1].'-'.$dir.'-radius: '.$rule_arr[3];
					$return .="\t".trim($rule).";\n";
				
				//flip left, right
				} elseif(preg_match('/\h+(left|right)\h*:\h*(.+)/i', $rule, $rule_arr)) {
					$dir = ((trim($rule_arr[1])=='left')?'right':'left');
					//reset LTR rule
					if((trim($rule_arr[1]) == 'left' && !preg_match('/\h+right\h*:/i', $rules)) || (trim($rule_arr[1]) == 'right' && !preg_match('/\h+left\h*:/i', $rules))) {
						$rule = trim($rule_arr[1]).": auto;\n\t";
					} else {
						$rule = '';
					}
					$rule .= $dir.': '.$rule_arr[2];
					$return .="\t".trim($rule).";\n";
				}
			}
		}
		return($return);
	}
	
?>