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- <?php
- /**
- * Class Minify_CSS_UriRewriter
- * @package Minify
- */
- /**
- * Rewrite file-relative URIs as root-relative in CSS files
- *
- * @package Minify
- * @author Stephen Clay <steve@mrclay.org>
- */
- class Minify_CSS_UriRewriter {
-
- /**
- * rewrite() and rewriteRelative() append debugging information here
- *
- * @var string
- */
- public static $debugText = '';
-
- /**
- * In CSS content, rewrite file relative URIs as root relative
- *
- * @param string $css
- *
- * @param string $currentDir The directory of the current CSS file.
- *
- * @param string $docRoot The document root of the web site in which
- * the CSS file resides (default = $_SERVER['DOCUMENT_ROOT']).
- *
- * @param array $symlinks (default = array()) If the CSS file is stored in
- * a symlink-ed directory, provide an array of link paths to
- * target paths, where the link paths are within the document root. Because
- * paths need to be normalized for this to work, use "//" to substitute
- * the doc root in the link paths (the array keys). E.g.:
- * <code>
- * array('//symlink' => '/real/target/path') // unix
- * array('//static' => 'D:\\staticStorage') // Windows
- * </code>
- *
- * @return string
- */
- public static function rewrite($css, $currentDir, $docRoot = null, $symlinks = array())
- {
- self::$_docRoot = self::_realpath(
- $docRoot ? $docRoot : $_SERVER['DOCUMENT_ROOT']
- );
- self::$_currentDir = self::_realpath($currentDir);
- self::$_symlinks = array();
-
- // normalize symlinks
- foreach ($symlinks as $link => $target) {
- $link = ($link === '//')
- ? self::$_docRoot
- : str_replace('//', self::$_docRoot . '/', $link);
- $link = strtr($link, '/', DIRECTORY_SEPARATOR);
- self::$_symlinks[$link] = self::_realpath($target);
- }
-
- self::$debugText .= "docRoot : " . self::$_docRoot . "\n"
- . "currentDir : " . self::$_currentDir . "\n";
- if (self::$_symlinks) {
- self::$debugText .= "symlinks : " . var_export(self::$_symlinks, 1) . "\n";
- }
- self::$debugText .= "\n";
-
- $css = self::_trimUrls($css);
-
- // rewrite
- $css = preg_replace_callback('/@import\\s+([\'"])(.*?)[\'"]/'
- ,array(self::$className, '_processUriCB'), $css);
- $css = preg_replace_callback('/url\\(\\s*([\'"](.*?)[\'"]|[^\\)\\s]+)\\s*\\)/'
- ,array(self::$className, '_processUriCB'), $css);
- return $css;
- }
-
- /**
- * In CSS content, prepend a path to relative URIs
- *
- * @param string $css
- *
- * @param string $path The path to prepend.
- *
- * @return string
- */
- public static function prepend($css, $path)
- {
- self::$_prependPath = $path;
-
- $css = self::_trimUrls($css);
-
- // append
- $css = preg_replace_callback('/@import\\s+([\'"])(.*?)[\'"]/'
- ,array(self::$className, '_processUriCB'), $css);
- $css = preg_replace_callback('/url\\(\\s*([\'"](.*?)[\'"]|[^\\)\\s]+)\\s*\\)/'
- ,array(self::$className, '_processUriCB'), $css);
- self::$_prependPath = null;
- return $css;
- }
-
- /**
- * Get a root relative URI from a file relative URI
- *
- * <code>
- * Minify_CSS_UriRewriter::rewriteRelative(
- * '../img/hello.gif'
- * , '/home/user/www/css' // path of CSS file
- * , '/home/user/www' // doc root
- * );
- * // returns '/img/hello.gif'
- *
- * // example where static files are stored in a symlinked directory
- * Minify_CSS_UriRewriter::rewriteRelative(
- * 'hello.gif'
- * , '/var/staticFiles/theme'
- * , '/home/user/www'
- * , array('/home/user/www/static' => '/var/staticFiles')
- * );
- * // returns '/static/theme/hello.gif'
- * </code>
- *
- * @param string $uri file relative URI
- *
- * @param string $realCurrentDir realpath of the current file's directory.
- *
- * @param string $realDocRoot realpath of the site document root.
- *
- * @param array $symlinks (default = array()) If the file is stored in
- * a symlink-ed directory, provide an array of link paths to
- * real target paths, where the link paths "appear" to be within the document
- * root. E.g.:
- * <code>
- * array('/home/foo/www/not/real/path' => '/real/target/path') // unix
- * array('C:\\htdocs\\not\\real' => 'D:\\real\\target\\path') // Windows
- * </code>
- *
- * @return string
- */
- public static function rewriteRelative($uri, $realCurrentDir, $realDocRoot, $symlinks = array())
- {
- // prepend path with current dir separator (OS-independent)
- $path = strtr($realCurrentDir, '/', DIRECTORY_SEPARATOR)
- . DIRECTORY_SEPARATOR . strtr($uri, '/', DIRECTORY_SEPARATOR);
-
- self::$debugText .= "file-relative URI : {$uri}\n"
- . "path prepended : {$path}\n";
-
- // "unresolve" a symlink back to doc root
- foreach ($symlinks as $link => $target) {
- if (0 === strpos($path, $target)) {
- // replace $target with $link
- $path = $link . substr($path, strlen($target));
-
- self::$debugText .= "symlink unresolved : {$path}\n";
-
- break;
- }
- }
- // strip doc root
- $path = substr($path, strlen($realDocRoot));
-
- self::$debugText .= "docroot stripped : {$path}\n";
-
- // fix to root-relative URI
- $uri = strtr($path, '/\\', '//');
- $uri = self::removeDots($uri);
-
- self::$debugText .= "traversals removed : {$uri}\n\n";
-
- return $uri;
- }
- /**
- * Remove instances of "./" and "../" where possible from a root-relative URI
- *
- * @param string $uri
- *
- * @return string
- */
- public static function removeDots($uri)
- {
- $uri = str_replace('/./', '/', $uri);
- // inspired by patch from Oleg Cherniy
- do {
- $uri = preg_replace('@/[^/]+/\\.\\./@', '/', $uri, 1, $changed);
- } while ($changed);
- return $uri;
- }
-
- /**
- * Defines which class to call as part of callbacks, change this
- * if you extend Minify_CSS_UriRewriter
- *
- * @var string
- */
- protected static $className = 'Minify_CSS_UriRewriter';
- /**
- * Get realpath with any trailing slash removed. If realpath() fails,
- * just remove the trailing slash.
- *
- * @param string $path
- *
- * @return mixed path with no trailing slash
- */
- protected static function _realpath($path)
- {
- $realPath = realpath($path);
- if ($realPath !== false) {
- $path = $realPath;
- }
- return rtrim($path, '/\\');
- }
- /**
- * Directory of this stylesheet
- *
- * @var string
- */
- private static $_currentDir = '';
- /**
- * DOC_ROOT
- *
- * @var string
- */
- private static $_docRoot = '';
- /**
- * directory replacements to map symlink targets back to their
- * source (within the document root) E.g. '/var/www/symlink' => '/var/realpath'
- *
- * @var array
- */
- private static $_symlinks = array();
- /**
- * Path to prepend
- *
- * @var string
- */
- private static $_prependPath = null;
- /**
- * @param string $css
- *
- * @return string
- */
- private static function _trimUrls($css)
- {
- return preg_replace('/
- url\\( # url(
- \\s*
- ([^\\)]+?) # 1 = URI (assuming does not contain ")")
- \\s*
- \\) # )
- /x', 'url($1)', $css);
- }
- /**
- * @param array $m
- *
- * @return string
- */
- private static function _processUriCB($m)
- {
- // $m matched either '/@import\\s+([\'"])(.*?)[\'"]/' or '/url\\(\\s*([^\\)\\s]+)\\s*\\)/'
- $isImport = ($m[0][0] === '@');
- // determine URI and the quote character (if any)
- if ($isImport) {
- $quoteChar = $m[1];
- $uri = $m[2];
- } else {
- // $m[1] is either quoted or not
- $quoteChar = ($m[1][0] === "'" || $m[1][0] === '"')
- ? $m[1][0]
- : '';
- $uri = ($quoteChar === '')
- ? $m[1]
- : substr($m[1], 1, strlen($m[1]) - 2);
- }
- // if not root/scheme relative and not starts with scheme
- if (!preg_match('~^(/|[a-z]+\:)~', $uri)) {
- // URI is file-relative: rewrite depending on options
- if (self::$_prependPath === null) {
- $uri = self::rewriteRelative($uri, self::$_currentDir, self::$_docRoot, self::$_symlinks);
- } else {
- $uri = self::$_prependPath . $uri;
- if ($uri[0] === '/') {
- $root = '';
- $rootRelative = $uri;
- $uri = $root . self::removeDots($rootRelative);
- } elseif (preg_match('@^((https?\:)?//([^/]+))/@', $uri, $m) && (false !== strpos($m[3], '.'))) {
- $root = $m[1];
- $rootRelative = substr($uri, strlen($root));
- $uri = $root . self::removeDots($rootRelative);
- }
- }
- }
- return $isImport
- ? "@import {$quoteChar}{$uri}{$quoteChar}"
- : "url({$quoteChar}{$uri}{$quoteChar})";
- }
- }
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