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Collapse "min" into project root and get unit tests working.
Fixes #472
This commit is contained in:
Steve Clay
216
lib/Minify/ImportProcessor.php
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216
lib/Minify/ImportProcessor.php
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@@ -0,0 +1,216 @@
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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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* 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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public static $filesIncluded = array();
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public static function process($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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return $obj->_getContent($file);
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}
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// allows callback funcs to know the current directory
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private $_currentDir = null;
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// allows callback funcs to know the directory of the file that inherits this one
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private $_previewsDir = null;
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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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private static $_isCss = null;
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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 = $previewsDir;
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}
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private function _getContent($file, $is_imported = false)
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{
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$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($file))
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) {
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// file missing, already included, or failed read
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return '';
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}
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self::$filesIncluded[] = realpath($file);
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$this->_currentDir = dirname($file);
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// remove UTF-8 BOM if present
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if (pack("CCC",0xef,0xbb,0xbf) === substr($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", $content);
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// process @imports
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$content = preg_replace_callback(
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'/
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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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,array($this, '_importCB')
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,$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 && $is_imported) {
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// rewrite remaining relative URIs
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$content = preg_replace_callback(
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'/url\\(\\s*([^\\)\\s]+)\\s*\\)/'
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,array($this, '_urlCB')
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,$content
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);
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}
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return $this->_importedContent . $content;
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}
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private function _importCB($m)
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{
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$url = $m[1];
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$mediaList = preg_replace('/\\s+/', '', $m[2]);
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if (strpos($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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return (!self::$_isCss || preg_match('@(?:^$|\\ball\\b)@', $mediaList))
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? $content
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: "@media {$mediaList} {\n{$content}\n}\n";
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}
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private function _urlCB($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] === '"')
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? $m[1][0]
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: '';
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$url = ($quote === '')
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? $m[1]
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: substr($m[1], 1, strlen($m[1]) - 2);
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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), $path);
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}
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}
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return "url({$quote}{$url}{$quote})";
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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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$arFrom = explode($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] == $arTo[0]))
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{
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array_shift($arFrom);
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array_shift($arTo);
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}
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return str_pad("", count($arFrom) * 3, '..' . $ps) . implode($ps, $arTo);
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}
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/**
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* This function is to replace PHP's extremely buggy realpath().
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* @param string $path The original path, can be relative etc.
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* @return string The resolved path, it might not exist.
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* @see http://stackoverflow.com/questions/4049856/replace-phps-realpath
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*/
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function truepath($path)
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{
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// whether $path is unix or not
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$unipath = strlen($path) == 0 || $path{0} != '/';
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// attempts to detect if path is relative in which case, add cwd
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if (strpos($path, ':') === false && $unipath)
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$path = $this->_currentDir . DIRECTORY_SEPARATOR . $path;
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// resolve path parts (single dot, double dot and double delimiters)
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$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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if ('..' == $part) {
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array_pop($absolutes);
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} else {
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$absolutes[] = $part;
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}
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}
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$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($path);
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// put initial separator that could have been lost
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$path = !$unipath ? '/' . $path : $path;
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return $path;
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}
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}
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