<?php
/**
 * Class Minify_CSS 
 * @package Minify
 */

/**
 * Minify CSS
 *
 * This class uses Minify_CSS_Compressor and Minify_CSS_UriRewriter to 
 * minify CSS and rewrite relative URIs.
 * 
 * @package Minify
 * @author Stephen Clay <steve@mrclay.org>
 * @author http://code.google.com/u/1stvamp/ (Issue 64 patch)
 */
class Minify_CSS {
 
 /**
 * Minify a CSS string
 * 
 * @param string $css
 * 
 * @param array $options available options:
 * 
 * 'preserveComments': (default true) multi-line comments that begin
 * with "/*!" will be preserved with newlines before and after to
 * enhance readability.
 *
 * 'removeCharsets': (default true) remove all @charset at-rules
 * 
 * 'prependRelativePath': (default null) if given, this string will be
 * prepended to all relative URIs in import/url declarations
 * 
 * 'currentDir': (default null) if given, this is assumed to be the
 * directory of the current CSS file. Using this, minify will rewrite
 * all relative URIs in import/url declarations to correctly point to
 * the desired files. For this to work, the files *must* exist and be
 * visible by the PHP process.
 *
 * 'symlinks': (default = array()) If the CSS file is stored in 
 * a symlink-ed directory, provide an array of link paths to
 * target paths, where the link paths are within the document root. Because 
 * paths need to be normalized for this to work, use "//" to substitute 
 * the doc root in the link paths (the array keys). E.g.:
 * <code>
 * array('//symlink' => '/real/target/path') // unix
 * array('//static' => 'D:\\staticStorage') // Windows
 * </code>
 *
 * 'docRoot': (default = $_SERVER['DOCUMENT_ROOT'])
 * see Minify_CSS_UriRewriter::rewrite
 * 
 * @return string
 */
 public static function minify($css, $options = array()) 
 {
 $options = array_merge(array(
 'compress' => true,
 'removeCharsets' => true,
 'preserveComments' => true,
 'currentDir' => null,
 'docRoot' => $_SERVER['DOCUMENT_ROOT'],
 'prependRelativePath' => null,
 'symlinks' => array(),
 ), $options);
 
 if ($options['removeCharsets']) {
 $css = preg_replace('/@charset[^;]+;\\s*/', '', $css);
 }
 if ($options['compress']) {
 if (! $options['preserveComments']) {
 $css = Minify_CSS_Compressor::process($css, $options);
 } else {
 $css = Minify_CommentPreserver::process(
 $css
 ,array('Minify_CSS_Compressor', 'process')
 ,array($options)
 );
 }
 }
 if (! $options['currentDir'] && ! $options['prependRelativePath']) {
 return $css;
 }
 if ($options['currentDir']) {
 return Minify_CSS_UriRewriter::rewrite(
 $css
 ,$options['currentDir']
 ,$options['docRoot']
 ,$options['symlinks']
 ); 
 } else {
 return Minify_CSS_UriRewriter::prepend(
 $css
 ,$options['prependRelativePath']
 );
 }
 }
}