<?php

/*
CSS Mixin, Version 2
Copyright 2007 Chuck Houpt
*/

$cssclass = array();
$debug = FALSE;

// ETag based on the same formula as Apache 1.3
function etag($file)
{
 	return sprintf('%x-%x-%x', fileinode($file), filesize($file), filemtime($file));
}

// cssmixin_init must be called first to setup HTTP headers and load base CSS styles.
function cssmixin_init($cssfile, $debugflag)
{
	global $cssclass;
	global $debug;
	
	$debug = $debugflag;

	$last_modified = max(filemtime($_SERVER['SCRIPT_FILENAME']), filemtime($cssfile));
	$etag = '"' . etag($_SERVER['SCRIPT_FILENAME']) . '-' . etag($cssfile) . '"';
	
	header('Content-type: text/css');
	header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $last_modified) . ' GMT');
	header("ETag: $etag");
	
	if ((isset($_SERVER['HTTP_IF_NONE_MATCH']) && strcmp($_SERVER['HTTP_IF_NONE_MATCH'], $etag) == 0) ||
		(isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $last_modified)) {
		header('HTTP/1.0 304 Not Modified');
		exit;
	}
		
	print("/* Generated by CSS Mixin v2 http://habilis.net/cssmixin/ */\n");
	if ($debug) print("/*\n    PHP Style Script: {$_SERVER['PHP_SELF']}\n      CSS Class File: $cssfile\n*/\n");
	
	// load CSS
	$f = file_get_contents($cssfile);
	
	// Strip all the comments
	$f = preg_replace('/\/\*.*\*\//sU', '', $f);
	
	// Tokenize into class names, and declariations.
	// It's not a parser, it's a pharser (hackish, kludgy parser).
	preg_match_all('/\.([_a-z0-9-]+)|{([^}]+)}/si', $f, $out, PREG_SET_ORDER);
	
	// Construct classes by appending descriptors
	$class_list = array();
	
	foreach ($out as $o) {
		$firstc = $o[0][0];		
		if ($firstc == '.') {
			$class = $o[1];
			$class_list[] = $class;
		} else if ($firstc == '{') {
			$descriptor = trim(trim($o[2], ' '), "\n\r");
			//$descriptor = preg_replace('/\n/m', 'X', $descriptor);
			foreach ($class_list as $c) {
				if ( array_key_exists($c, $cssclass) ) {
					if ($debug) $cssclass[$c] =  $cssclass[$c] . "\n" . $descriptor;
					else $cssclass[$c] =  $cssclass[$c] . $descriptor;
				} else $cssclass[$c] =  $descriptor;
			}
			$class_list = array();
		}
	}	

//	print_r($cssclass);
}

// cssmixin creates a new style descriptor based on the $mixinclasses list.
function cssmixin($newspec, $mixinclasses)
{
	global $cssclass;
	global $debug;
	
	if ($debug) print("$newspec {\n");
	else print("$newspec{");
	$clist = explode(' ', $mixinclasses);
	$first = TRUE;
	foreach ($clist as $c) {
		if ($debug) {
			if ($first) $first = FALSE;
			else print("\n");
			print("/* Class: $c */\n$cssclass[$c]\n");
		} else print($cssclass[$c]);
	}
	if ($debug) print("}\n\n");
	else print("}\n");
}

?>