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<?php namespace Stolz\Assets;
use Closure;
use FilesystemIterator;
use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;
use RegexIterator;
class Manager
{
/**
* Regex to match against a filename/url to determine if it is an asset.
*
* @var string
*/
protected $asset_regex = '/.\.(css|js)$/i';
/**
* Regex to match against a filename/url to determine if it is a CSS asset.
*
* @var string
*/
protected $css_regex = '/.\.css$/i';
/**
* Regex to match against a filename/url to determine if it is a JavaScript asset.
*
* @var string
*/
protected $js_regex = '/.\.js$/i';
/**
* Regex to match against a filename/url to determine if it should not be minified by pipeline.
*
* @var string
*/
protected $no_minification_regex = '/.[-.]min\.(css|js)$/i';
/**
* Absolute path to the public directory of your App (WEBROOT).
* Required if you enable the pipeline.
* No trailing slash!.
*
* @var string
*/
protected $public_dir;
/**
* Directory for local CSS assets.
* Relative to your public directory ('public_dir').
* No trailing slash!.
*
* @var string
*/
protected $css_dir = 'css';
/**
* Directory for local JavaScript assets.
* Relative to your public directory ('public_dir').
* No trailing slash!.
*
* @var string
*/
protected $js_dir = 'js';
/**
* Directory for local package assets.
* Relative to your public directory ('public_dir').
* No trailing slash!.
*
* @var string
*/
protected $packages_dir = 'packages';
/**
* Enable assets pipeline (concatenation and minification).
* Use a string that evaluates to `true` to provide the salt of the pipeline hash.
* Use 'auto' to automatically calculated the salt from your assets last modification time.
*
* @var bool|string
*/
protected $pipeline = false;
/**
* Directory for storing pipelined assets.
* Relative to your assets directories ('css_dir' and 'js_dir').
* No trailing slash!.
*
* @var string
*/
protected $pipeline_dir = 'min';
/**
* Enable pipelined assets compression with Gzip. Do not enable unless you know what you are doing!.
* Useful only if your webserver supports Gzip HTTP_ACCEPT_ENCODING.
* Set to true to use the default compression level.
* Set an integer between 0 (no compression) and 9 (maximum compression) to choose compression level.
*
* @var bool|integer
*/
protected $pipeline_gzip = false;
/**
* Closure used by the pipeline to fetch assets.
*
* Useful when file_get_contents() function is not available in your PHP
* instalation or when you want to apply any kind of preprocessing to
* your assets before they get pipelined.
*
* The closure will receive as the only parameter a string with the path/URL of the asset and
* it should return the content of the asset file as a string.
*
* @var Closure
*/
protected $fetch_command;
/**
* Closure invoked by the pipeline whenever new assets are pipelined for the first time.
*
* Useful if you need to hook to the pipeline event for things such syncing your pipelined
* assets with an external server or CDN.
*
* The closure will receive five parameters:
* - String containing the name of the file that has been created.
* - String containing the relative URL of the file.
* - String containing the absolute path (filesystem) of the file.
* - Array containing the assets included in the file.
* - Boolean indicating whether or not a gziped version of the file was also created.
*
* @var Closure
*/
protected $notify_command;
/**
* Closure used by the pipeline to minify CSS assets.
*
* @var Closure
*/
protected $css_minifier;
/**
* Closure used by the pipeline to minify JavaScript assets.
*
* @var Closure
*/
protected $js_minifier;
/**
* Available collections.
* Each collection is an array of assets.
* Collections may also contain other collections.
*
* @var array
*/
protected $collections = array();
/**
* CSS files already added.
* Not accepted as an option of config() method.
*
* @var array
*/
protected $css = array();
/**
* JavaScript files already added.
* Not accepted as an option of config() method.
*
* @var array
*/
protected $js = array();
/**
* Class constructor.
*
* @param array $options See config() method for details.
* @return void
*/
public function __construct(array $options = array())
{
// Forward config options
if($options)
$this->config($options);
}
/**
* Set up configuration options.
*
* All the class properties except 'js' and 'css' are accepted here.
* Also, an extra option 'autoload' may be passed containing an array of
* assets and/or collections that will be automatically added on startup.
*
* @param array $config Configurable options.
* @return Manager
*/
public function config(array $config)
{
// Set regex options
foreach(array('asset_regex', 'css_regex', 'js_regex', 'no_minification_regex') as $option)
if(isset($config[$option]) and (@preg_match($config[$option], null) !== false))
$this->$option = $config[$option];
// Set common options
foreach(array('public_dir', 'css_dir', 'js_dir', 'packages_dir', 'pipeline', 'pipeline_dir', 'pipeline_gzip') as $option)
if(isset($config[$option]))
$this->$option = $config[$option];
// Set pipeline options
foreach(array('fetch_command', 'notify_command', 'css_minifier', 'js_minifier') as $option)
if(isset($config[$option]) and ($config[$option] instanceof Closure))
$this->$option = $config[$option];
// Set collections
if(isset($config['collections']) and is_array($config['collections']))
$this->collections = $config['collections'];
// Autoload assets
if(isset($config['autoload']) and is_array($config['autoload']))
foreach($config['autoload'] as $asset)
$this->add($asset);
return $this;
}
/**
* Add an asset or a collection of assets.
*
* It automatically detects the asset type (JavaScript, CSS or collection).
* You may add more than one asset passing an array as argument.
*
* @param mixed $asset
* @return Manager
*/
public function add($asset)
{
// More than one asset
if(is_array($asset))
{
foreach($asset as $a)
$this->add($a);
}
// Collection
elseif(isset($this->collections[$asset]))
$this->add($this->collections[$asset]);
// JavaScript asset
elseif(preg_match($this->js_regex, $asset))
$this->addJs($asset);
// CSS asset
elseif(preg_match($this->css_regex, $asset))
$this->addCss($asset);
return $this;
}
/**
* Add an asset or a collection of assets to the beginning of the queue.
*
* It automatically detects the asset type (JavaScript, CSS or collection).
* You may prepend more than one asset passing an array as argument.
*
* @param mixed $asset
* @return Manager
*/
public function prepend($asset)
{
// More than one asset
if(is_array($asset))
{
foreach(array_reverse($asset) as $a)
$this->prepend($a);
}
// Collection
elseif(isset($this->collections[$asset]))
$this->prepend($this->collections[$asset]);
// JavaScript asset
elseif(preg_match($this->js_regex, $asset))
$this->prependJs($asset);
// CSS asset
elseif(preg_match($this->css_regex, $asset))
$this->prependCss($asset);
return $this;
}
/**
* Add a CSS asset.
*
* It checks for duplicates.
* You may add more than one asset passing an array as argument.
*
* @param mixed $asset
* @return Manager
*/
public function addCss($asset)
{
if(is_array($asset))
{
foreach($asset as $a)
$this->addCss($a);
return $this;
}
if( ! $this->isRemoteLink($asset))
$asset = $this->buildLocalLink($asset, $this->css_dir);
if( ! in_array($asset, $this->css))
$this->css[] = $asset;
return $this;
}
/**
* Add a CSS asset to the beginning of the queue.
*
* It checks for duplicates.
* You may prepend more than one asset passing an array as argument.
*
* @param mixed $asset
* @return Manager
*/
public function prependCss($asset)
{
if(is_array($asset))
{
foreach(array_reverse($asset) as $a)
$this->prependCss($a);
return $this;
}
if( ! $this->isRemoteLink($asset))
$asset = $this->buildLocalLink($asset, $this->css_dir);
if( ! in_array($asset, $this->css))
array_unshift($this->css, $asset);
return $this;
}
/**
* Add a JavaScript asset.
*
* It checks for duplicates.
* You may add more than one asset passing an array as argument.
*
* @param mixed $asset
* @return Manager
*/
public function addJs($asset)
{
if(is_array($asset))
{
foreach($asset as $a)
$this->addJs($a);
return $this;
}
if( ! $this->isRemoteLink($asset))
$asset = $this->buildLocalLink($asset, $this->js_dir);
if( ! in_array($asset, $this->js))
$this->js[] = $asset;
return $this;
}
/**
* Add a JavaScript asset to the beginning of the queue.
*
* It checks for duplicates.
* You may prepend more than one asset passing an array as argument.
*
* @param mixed $asset
* @return Manager
*/
public function prependJs($asset)
{
if(is_array($asset))
{
foreach(array_reverse($asset) as $a)
$this->prependJs($a);
return $this;
}
if( ! $this->isRemoteLink($asset))
$asset = $this->buildLocalLink($asset, $this->js_dir);
if( ! in_array($asset, $this->js))
array_unshift($this->js, $asset);
return $this;
}
/**
* Build the CSS `<link>` tags.
*
* Accepts an array of $attributes for the HTML tag.
* You can take control of the tag rendering by
* providing a closure that will receive an array of assets.
*
* @param array|Closure $attributes
* @return string
*/
public function css($attributes = null)
{
if( ! $this->css)
return '';
$assets = ($this->pipeline) ? array($this->cssPipeline()) : $this->css;
if($attributes instanceof Closure)
return $attributes->__invoke($assets);
// Build attributes
$attributes = (array) $attributes;
unset($attributes['href']);
if( ! array_key_exists('type', $attributes))
$attributes['type'] = 'text/css';
if( ! array_key_exists('rel', $attributes))
$attributes['rel'] = 'stylesheet';
$attributes = $this->buildTagAttributes($attributes);
// Build tags
$output = '';
foreach($assets as $asset)
$output .= '<link href="' . $asset . '"' . $attributes . " />\n";
return $output;
}
/**
* Build the JavaScript `<script>` tags.
*
* Accepts an array of $attributes for the HTML tag.
* You can take control of the tag rendering by
* providing a closure that will receive an array of assets.
*
* @param array|Closure $attributes
* @return string
*/
public function js($attributes = null)
{
if( ! $this->js)
return '';
$assets = ($this->pipeline) ? array($this->jsPipeline()) : $this->js;
if($attributes instanceof Closure)
return $attributes->__invoke($assets);
// Build attributes
$attributes = (array) $attributes;
unset($attributes['src']);
if( ! array_key_exists('type', $attributes))
$attributes['type'] = 'text/javascript';
$attributes = $this->buildTagAttributes($attributes);
// Build tags
$output = '';
foreach($assets as $asset)
$output .= '<script src="' . $asset . '"' . $attributes . "></script>\n";
return $output;
}
/**
* Add/replace collection.
*
* @param string $collectionName
* @param array $assets
* @return Manager
*/
public function registerCollection($collectionName, array $assets)
{
$this->collections[$collectionName] = $assets;
return $this;
}
/**
* Reset all assets.
*
* @return Manager
*/
public function reset()
{
return $this->resetCss()->resetJs();
}
/**
* Reset CSS assets.
*
* @return Manager
*/
public function resetCss()
{
$this->css = array();
return $this;
}
/**
* Reset JavaScript assets.
*
* @return Manager
*/
public function resetJs()
{
$this->js = array();
return $this;
}
/**
* Minifiy and concatenate CSS files.
*
* @return string
*/
protected function cssPipeline()
{
// If a custom minifier has been set use it, otherwise fallback to default
$minifier = (isset($this->css_minifier)) ? $this->css_minifier : function ($buffer) {
$min = new \CSSmin();
return $min->run($buffer);
};
return $this->pipeline($this->css, '.css', $this->css_dir, $minifier);
}
/**
* Minifiy and concatenate JavaScript files.
*
* @return string
*/
protected function jsPipeline()
{
// If a custom minifier has been set use it, otherwise fallback to default
$minifier = (isset($this->js_minifier)) ? $this->js_minifier : function ($buffer) {
return \JSMin::minify($buffer);
};
return $this->pipeline($this->js, '.js', $this->js_dir, $minifier);
}
/**
* Minifiy and concatenate files.
*
* @param array $assets
* @param string $extension
* @param string $subdirectory
* @param Closure $minifier
* @return string
*/
protected function pipeline(array $assets, $extension, $subdirectory, Closure $minifier)
{
// Create destination dir if it doesn't exist.
$pipeline_dir = $this->public_dir . DIRECTORY_SEPARATOR . $subdirectory . DIRECTORY_SEPARATOR . $this->pipeline_dir;
if( ! is_dir($pipeline_dir))
mkdir($pipeline_dir, 0777, true);
// Generate paths
$filename = $this->calculatePipelineHash($assets) . $extension;
$relative_path = "$subdirectory/{$this->pipeline_dir}/$filename";
$absolute_path = realpath($pipeline_dir) . DIRECTORY_SEPARATOR . $filename;
// If pipeline already exists return it
if(file_exists($absolute_path))
return $relative_path;
// Download, concatenate and minifiy files
$buffer = $this->packLinks($assets, $minifier);
// Write minified file
file_put_contents($absolute_path, $buffer);
// Write gziped file
if($gzipAvailable = (function_exists('gzencode') and $this->pipeline_gzip !== false))
{
$level = ($this->pipeline_gzip === true) ? -1 : intval($this->pipeline_gzip);
file_put_contents("$absolute_path.gz", gzencode($buffer, $level));
}
// Hook for pipeline event
if($this->notify_command instanceof Closure)
$this->notify_command->__invoke($filename, $relative_path, $absolute_path, $assets, $gzipAvailable);
return $relative_path;
}
/**
* Calculate the pipeline hash.
*
* @param array $assets
* @return string
*/
protected function calculatePipelineHash(array $assets)
{
$salt = $this->pipeline;
// Pipeline disabled. Do not salt hash
if( ! $salt)
return md5(implode($assets));
// Custom salt
if($salt !== 'auto')
return md5(implode($assets) . $salt);
// Automatic salt based on the last modification time of the assets
$timestamps = array();
foreach($assets as $asset)
{
if($this->isRemoteLink($asset))
continue;
$file = realpath($this->public_dir . DIRECTORY_SEPARATOR . $asset);
if($file === false)
continue;
$timestamps[] = filemtime($file);
}
return md5(implode($assets) . implode($timestamps));
}
/**
* Download, concatenate and minifiy the content of several links.
*
* @param array $links
* @param Closure $minifier
* @return string
*/
protected function packLinks(array $links, Closure $minifier)
{
$buffer = '';
foreach($links as $link)
{
$originalLink = $link;
// Get real link path
if($this->isRemoteLink($link))
{
// Add current protocol to agnostic links
if('//' === substr($link, 0, 2))
{
$protocol = (isset($_SERVER['HTTPS']) and ! empty($_SERVER['HTTPS']) and $_SERVER['HTTPS'] !== 'off') ? 'https:' : 'http:';
$link = $protocol . $link;
}
}
else
{
$link = realpath($this->public_dir . DIRECTORY_SEPARATOR . $link);
if($link === false)
continue;
}
// Fetch link content
$content = ($this->fetch_command instanceof Closure) ? $this->fetch_command->__invoke($link) : file_get_contents($link);
// Minify
$buffer .= (preg_match($this->no_minification_regex, $originalLink)) ? $content : $minifier->__invoke($content);
// Avoid JavaScript minification problems
$buffer .= PHP_EOL;
}
return $buffer;
}
/**
* Build link to local asset.
*
* Detects packages links.
*
* @param string $asset
* @param string $dir
* @return string the link
*/
protected function buildLocalLink($asset, $dir)
{
$package = $this->assetIsFromPackage($asset);
if($package === false)
return $dir . '/' . $asset;
return $this->packages_dir . '/' . $package[0] . '/' .$package[1] . '/' . ltrim($dir, '/') . '/' . $package[2];
}
/**
* Build an HTML attribute string from an array.
*
* @param array $attributes
* @return string
*/
public function buildTagAttributes(array $attributes)
{
$html = array();
foreach ($attributes as $key => $value)
{
if (is_null($value))
continue;
if (is_numeric($key))
$key = $value;
$html[] = $key . '="' . htmlentities($value, ENT_QUOTES, 'UTF-8', false) . '"';
}
return (count($html) > 0) ? ' ' . implode(' ', $html) : '';
}
/**
* Determine whether an asset is normal or from a package.
*
* @param string $asset
* @return bool|array
*/
protected function assetIsFromPackage($asset)
{
if(preg_match('{^([A-Za-z0-9_.-]+)/([A-Za-z0-9_.-]+):(.*)$}', $asset, $matches))
return array_slice($matches, 1, 3);
return false;
}
/**
* Determine whether a link is local or remote.
*
* Undestands both "http://" and "https://" as well as protocol agnostic links "//"
*
* @param string $link
* @return bool
*/
protected function isRemoteLink($link)
{
return ('http://' === substr($link, 0, 7) or 'https://' === substr($link, 0, 8) or '//' === substr($link, 0, 2));
}
/**
* Get all CSS assets already added.
*
* @return array
*/
public function getCss()
{
return $this->css;
}
/**
* Get all JavaScript assets already added.
*
* @return array
*/
public function getJs()
{
return $this->js;
}
/**
* Add all assets matching $pattern within $directory.
*
* @param string $directory Relative to $this->public_dir
* @param string $pattern (regex)
* @return Manager
*/
public function addDir($directory, $pattern = null)
{
// Make sure directory exists
$absolute_path = realpath($this->public_dir . DIRECTORY_SEPARATOR . $directory);
if($absolute_path === false)
return $this;
// By default match all assets
if(is_null($pattern))
$pattern = $this->asset_regex;
// Get assets files
$files = $this->rglob($absolute_path, $pattern, $this->public_dir);
// No luck? Nothing to do
if( ! $files)
return $this;
// Avoid polling if the pattern is our old friend JavaScript
if($pattern === $this->js_regex)
$this->js = array_unique(array_merge($this->js, $files));
// Avoid polling if the pattern is our old friend CSS
elseif($pattern === $this->css_regex)
$this->css = array_unique(array_merge($this->css, $files));
// Unknown pattern. We must poll to know the asset type :(
else
{
foreach($files as $asset)
{
if(preg_match($this->js_regex, $asset))
$this->js[] = $asset;
elseif(preg_match($this->css_regex, $asset))
$this->css[] = $asset;
}
$this->js = array_unique($this->js);
$this->css = array_unique($this->css);
}
return $this;
}
/**
* Add all CSS assets within $directory (relative to public dir).
*
* @param string $directory Relative to $this->public_dir
* @return Manager
*/
public function addDirCss($directory)
{
return $this->addDir($directory, $this->css_regex);
}
/**
* Add all JavaScript assets within $directory (relative to public dir).
*
* @param string $directory Relative to $this->public_dir
* @return Manager
*/
public function addDirJs($directory)
{
return $this->addDir($directory, $this->js_regex);
}
/**
* Recursively get files matching $pattern within $directory.
*
* @param string $directory
* @param string $pattern (regex)
* @param string $ltrim Will be trimed from the left of the file path
* @return array
*/
protected function rglob($directory, $pattern, $ltrim = null)
{
$iterator = new RegexIterator(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directory, FilesystemIterator::SKIP_DOTS)), $pattern);
$offset = strlen($ltrim);
$files = array();
foreach($iterator as $file)
$files[] = substr($file->getPathname(), $offset);
return $files;
}
}