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<?php
/**
* Class Minify_HTML_Helper
* @package Minify
*/
/**
* Helpers for writing Minfy URIs into HTML
*
* @package Minify
* @author Stephen Clay <steve@mrclay.org>
*/
class Minify_HTML_Helper {
public $rewriteWorks = true;
public $minAppUri = '/min';
public $groupsConfigFile = '';
/**
* Get an HTML-escaped Minify URI for a group or set of files
*
* @param string|array $keyOrFiles a group key or array of filepaths/URIs
* @param array $opts options:
* 'farExpires' : (default true) append a modified timestamp for cache revving
* 'debug' : (default false) append debug flag
* 'charset' : (default 'UTF-8') for htmlspecialchars
* 'minAppUri' : (default '/min') URI of min directory
* 'rewriteWorks' : (default true) does mod_rewrite work in min app?
* 'groupsConfigFile' : specify if different
* @return string
*/
public static function getUri($keyOrFiles, $opts = array())
{
$opts = array_merge(array( // default options
'farExpires' => true
,'debug' => false
,'charset' => 'UTF-8'
,'minAppUri' => '/min'
,'rewriteWorks' => true
,'groupsConfigFile' => ''
), $opts);
$h = new self;
$h->minAppUri = $opts['minAppUri'];
$h->rewriteWorks = $opts['rewriteWorks'];
$h->groupsConfigFile = $opts['groupsConfigFile'];
if (is_array($keyOrFiles)) {
$h->setFiles($keyOrFiles, $opts['farExpires']);
} else {
$h->setGroup($keyOrFiles, $opts['farExpires']);
}
$uri = $h->getRawUri($opts['farExpires'], $opts['debug']);
return htmlspecialchars($uri, ENT_QUOTES, $opts['charset']);
}
/**
* Get non-HTML-escaped URI to minify the specified files
*
* @param bool $farExpires
* @param bool $debug
* @return string
*/
public function getRawUri($farExpires = true, $debug = false)
{
$path = rtrim($this->minAppUri, '/') . '/';
if (! $this->rewriteWorks) {
$path .= '?';
}
if (null === $this->_groupKey) {
// @todo: implement shortest uri
$path = self::_getShortestUri($this->_filePaths, $path);
} else {
$path .= "g=" . $this->_groupKey;
}
if ($debug) {
$path .= "&debug";
} elseif ($farExpires && $this->_lastModified) {
$path .= "&" . $this->_lastModified;
}
return $path;
}
/**
* Set the files that will comprise the URI we're building
*
* @param array $files
* @param bool $checkLastModified
*/
public function setFiles($files, $checkLastModified = true)
{
$this->_groupKey = null;
if ($checkLastModified) {
$this->_lastModified = self::getLastModified($files);
}
// normalize paths like in /min/f=<paths>
foreach ($files as $k => $file) {
if (0 === strpos($file, '//')) {
$file = substr($file, 2);
} elseif (0 === strpos($file, '/')
|| 1 === strpos($file, ':\\')) {
$file = substr($file, strlen($_SERVER['DOCUMENT_ROOT']) + 1);
}
$file = strtr($file, '\\', '/');
$files[$k] = $file;
}
$this->_filePaths = $files;
}
/**
* Set the group of files that will comprise the URI we're building
*
* @param string $key
* @param bool $checkLastModified
*/
public function setGroup($key, $checkLastModified = true)
{
$this->_groupKey = $key;
if ($checkLastModified) {
if (! $this->groupsConfigFile) {
$this->groupsConfigFile = dirname(dirname(dirname(dirname(__FILE__)))) . '/groupsConfig.php';
}
if (is_file($this->groupsConfigFile)) {
$gc = (require $this->groupsConfigFile);
$keys = explode(',', $key);
foreach ($keys as $key) {
if (isset($gc[$key])) {
$this->_lastModified = self::getLastModified($gc[$key], $this->_lastModified);
}
}
}
}
}
/**
* Get the max(lastModified) of all files
*
* @param array|string $sources
* @param int $lastModified
* @return int
*/
public static function getLastModified($sources, $lastModified = 0)
{
$max = $lastModified;
foreach ((array)$sources as $source) {
if (is_object($source) && isset($source->lastModified)) {
$max = max($max, $source->lastModified);
} elseif (is_string($source)) {
if (0 === strpos($source, '//')) {
$source = $_SERVER['DOCUMENT_ROOT'] . substr($source, 1);
}
if (is_file($source)) {
$max = max($max, filemtime($source));
}
}
}
return $max;
}
protected $_groupKey = null; // if present, URI will be like g=...
protected $_filePaths = array();
protected $_lastModified = null;
/**
* In a given array of strings, find the character they all have at
* a particular index
*
* @param array $arr array of strings
* @param int $pos index to check
* @return mixed a common char or '' if any do not match
*/
protected static function _getCommonCharAtPos($arr, $pos) {
if (!isset($arr[0][$pos])) {
return '';
}
$c = $arr[0][$pos];
$l = count($arr);
if ($l === 1) {
return $c;
}
for ($i = 1; $i < $l; ++$i) {
if ($arr[$i][$pos] !== $c) {
return '';
}
}
return $c;
}
/**
* Get the shortest URI to minify the set of source files
*
* @param array $paths root-relative URIs of files
* @param string $minRoot root-relative URI of the "min" application
* @return string
*/
protected static function _getShortestUri($paths, $minRoot = '/min/') {
$pos = 0;
$base = '';
while (true) {
$c = self::_getCommonCharAtPos($paths, $pos);
if ($c === '') {
break;
} else {
$base .= $c;
}
++$pos;
}
$base = preg_replace('@[^/]+$@', '', $base);
$uri = $minRoot . 'f=' . implode(',', $paths);
if (substr($base, -1) === '/') {
// we have a base dir!
$basedPaths = $paths;
$l = count($paths);
for ($i = 0; $i < $l; ++$i) {
$basedPaths[$i] = substr($paths[$i], strlen($base));
}
$base = substr($base, 0, strlen($base) - 1);
$bUri = $minRoot . 'b=' . $base . '&f=' . implode(',', $basedPaths);
$uri = strlen($uri) < strlen($bUri)
? $uri
: $bUri;
}
return $uri;
}
}