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<?php |
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/** |
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* Class Minify_ImportProcessor |
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* @package Minify |
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*/ |
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|
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/** |
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* Linearize a CSS/JS file by including content specified by CSS import |
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* declarations. In CSS files, relative URIs are fixed. |
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* |
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* @imports will be processed regardless of where they appear in the source |
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* files; i.e. @imports commented out or in string content will still be |
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* processed! |
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* |
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* This has a unit test but should be considered "experimental". |
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* |
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* @package Minify |
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* @author Stephen Clay <steve@mrclay.org> |
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* @author Simon Schick <simonsimcity@gmail.com> |
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*/ |
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class Minify_ImportProcessor |
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{ |
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public static $filesIncluded = array(); |
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|
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public static function process($file) |
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{ |
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self::$filesIncluded = array(); |
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self::$_isCss = (strtolower(substr($file, -4)) === '.css'); |
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$obj = new Minify_ImportProcessor(dirname($file)); |
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|
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return $obj->_getContent($file); |
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} |
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|
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// allows callback funcs to know the current directory |
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private $_currentDir; |
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|
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// allows callback funcs to know the directory of the file that inherits this one |
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private $_previewsDir; |
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|
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// allows _importCB to write the fetched content back to the obj |
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private $_importedContent = ''; |
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|
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private static $_isCss; |
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|
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/** |
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* @param String $currentDir |
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* @param String $previewsDir Is only used internally |
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*/ |
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private function __construct($currentDir, $previewsDir = "") |
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{ |
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$this->_currentDir = $currentDir; |
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$this->_previewsDir = $previewsDir; |
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} |
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|
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private function _getContent($file, $is_imported = false) |
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{ |
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$file = preg_replace('~\\?.*~', '', $file); |
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$file = realpath($file); |
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if (! $file |
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|| in_array($file, self::$filesIncluded) |
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|| false === ($content = @file_get_contents($file))) { |
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// file missing, already included, or failed read |
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return ''; |
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} |
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self::$filesIncluded[] = realpath($file); |
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$this->_currentDir = dirname($file); |
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|
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// remove UTF-8 BOM if present |
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if (pack("CCC", 0xef, 0xbb, 0xbf) === substr($content, 0, 3)) { |
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$content = substr($content, 3); |
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} |
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// ensure uniform EOLs |
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$content = str_replace("\r\n", "\n", $content); |
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|
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// process @imports |
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$pattern = '/ |
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@import\\s+ |
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(?:url\\(\\s*)? # maybe url( |
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[\'"]? # maybe quote |
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(.*?) # 1 = URI |
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[\'"]? # maybe end quote |
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(?:\\s*\\))? # maybe ) |
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([a-zA-Z,\\s]*)? # 2 = media list |
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; # end token |
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/x'; |
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$content = preg_replace_callback($pattern, array($this, '_importCB'), $content); |
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|
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// You only need to rework the import-path if the script is imported |
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if (self::$_isCss && $is_imported) { |
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// rewrite remaining relative URIs |
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$pattern = '/url\\(\\s*([^\\)\\s]+)\\s*\\)/'; |
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$content = preg_replace_callback($pattern, array($this, '_urlCB'), $content); |
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} |
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|
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return $this->_importedContent . $content; |
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} |
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|
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private function _importCB($m) |
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{ |
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$url = $m[1]; |
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$mediaList = preg_replace('/\\s+/', '', $m[2]); |
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|
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if (strpos($url, '://') > 0) { |
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// protocol, leave in place for CSS, comment for JS |
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return self::$_isCss |
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? $m[0] |
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: "/* Minify_ImportProcessor will not include remote content */"; |
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} |
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if ('/' === $url[0]) { |
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// protocol-relative or root path |
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$url = ltrim($url, '/'); |
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$file = realpath($_SERVER['DOCUMENT_ROOT']) . DIRECTORY_SEPARATOR |
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. strtr($url, '/', DIRECTORY_SEPARATOR); |
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} else { |
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// relative to current path |
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$file = $this->_currentDir . DIRECTORY_SEPARATOR |
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. strtr($url, '/', DIRECTORY_SEPARATOR); |
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} |
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$obj = new Minify_ImportProcessor(dirname($file), $this->_currentDir); |
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$content = $obj->_getContent($file, true); |
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if ('' === $content) { |
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// failed. leave in place for CSS, comment for JS |
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return self::$_isCss |
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? $m[0] |
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: "/* Minify_ImportProcessor could not fetch '{$file}' */"; |
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} |
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|
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return (!self::$_isCss || preg_match('@(?:^$|\\ball\\b)@', $mediaList)) |
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? $content |
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: "@media {$mediaList} {\n{$content}\n}\n"; |
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} |
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|
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private function _urlCB($m) |
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{ |
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// $m[1] is either quoted or not |
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$quote = ($m[1][0] === "'" || $m[1][0] === '"') ? $m[1][0] : ''; |
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|
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$url = ($quote === '') ? $m[1] : substr($m[1], 1, strlen($m[1]) - 2); |
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|
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if ('/' !== $url[0]) { |
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if (strpos($url, '//') > 0) { |
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// probably starts with protocol, do not alter |
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} else { |
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// prepend path with current dir separator (OS-independent) |
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$path = $this->_currentDir |
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. DIRECTORY_SEPARATOR . strtr($url, '/', DIRECTORY_SEPARATOR); |
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// update the relative path by the directory of the file that imported this one |
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$url = self::getPathDiff(realpath($this->_previewsDir), $path); |
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} |
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} |
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|
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return "url({$quote}{$url}{$quote})"; |
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} |
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|
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/** |
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* @param string $from |
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* @param string $to |
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* @param string $ps |
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* @return string |
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*/ |
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private function getPathDiff($from, $to, $ps = DIRECTORY_SEPARATOR) |
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{ |
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$realFrom = $this->truepath($from); |
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$realTo = $this->truepath($to); |
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|
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$arFrom = explode($ps, rtrim($realFrom, $ps)); |
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$arTo = explode($ps, rtrim($realTo, $ps)); |
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while (count($arFrom) && count($arTo) && ($arFrom[0] == $arTo[0])) { |
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array_shift($arFrom); |
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array_shift($arTo); |
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} |
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|
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return str_pad("", count($arFrom) * 3, '..' . $ps) . implode($ps, $arTo); |
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} |
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|
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/** |
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* This function is to replace PHP's extremely buggy realpath(). |
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* @param string $path The original path, can be relative etc. |
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* @return string The resolved path, it might not exist. |
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* @see http://stackoverflow.com/questions/4049856/replace-phps-realpath |
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*/ |
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private function truepath($path) |
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{ |
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// whether $path is unix or not |
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$unipath = ('' === $path) || ($path[0] !== '/'); |
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|
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// attempts to detect if path is relative in which case, add cwd |
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if (strpos($path, ':') === false && $unipath) { |
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$path = $this->_currentDir . DIRECTORY_SEPARATOR . $path; |
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} |
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|
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// resolve path parts (single dot, double dot and double delimiters) |
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$path = str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $path); |
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$parts = array_filter(explode(DIRECTORY_SEPARATOR, $path), 'strlen'); |
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$absolutes = array(); |
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foreach ($parts as $part) { |
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if ('.' === $part) { |
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continue; |
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} |
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if ('..' === $part) { |
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array_pop($absolutes); |
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} else { |
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$absolutes[] = $part; |
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} |
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} |
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|
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$path = implode(DIRECTORY_SEPARATOR, $absolutes); |
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// resolve any symlinks |
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if (file_exists($path) && linkinfo($path) > 0) { |
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$path = readlink($path); |
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} |
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// put initial separator that could have been lost |
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$path = !$unipath ? '/' . $path : $path; |
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|
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return $path; |
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} |
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} |
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|
