mirror of
https://github.com/mrclay/minify.git
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712 lines
26 KiB
PHP
712 lines
26 KiB
PHP
<?php
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/**
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* Class Minify
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* @package Minify
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*/
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/**
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* Minify - Combines, minifies, and caches JavaScript and CSS files on demand.
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*
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* See README for usage instructions (for now).
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*
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* This library was inspired by {@link mailto:flashkot@mail.ru jscsscomp by Maxim Martynyuk}
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* and by the article {@link http://www.hunlock.com/blogs/Supercharged_Javascript "Supercharged JavaScript" by Patrick Hunlock}.
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*
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* Requires PHP 5.1.0.
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* Tested on PHP 5.1.6.
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*
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* @package Minify
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* @author Ryan Grove <ryan@wonko.com>
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* @author Stephen Clay <steve@mrclay.org>
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* @copyright 2008 Ryan Grove, Stephen Clay. All rights reserved.
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* @license http://opensource.org/licenses/bsd-license.php New BSD License
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* @link https://github.com/mrclay/minify
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*/
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class Minify {
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const VERSION = '3.0.0';
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const TYPE_CSS = 'text/css';
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const TYPE_HTML = 'text/html';
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// there is some debate over the ideal JS Content-Type, but this is the
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// Apache default and what Yahoo! uses..
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const TYPE_JS = 'application/x-javascript';
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const URL_DEBUG = 'https://github.com/mrclay/minify/blob/master/docs/Debugging.wiki.md';
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/**
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* Any Minify_Cache_* object or null (i.e. no server cache is used)
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*
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* @var Minify_CacheInterface
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*/
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private $cache = null;
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/**
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* Active controller for current request
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*
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* @var Minify_Controller_Base
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*/
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protected $controller = null;
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/**
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* @var Minify_SourceInterface[]
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*/
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protected $sources;
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/**
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* @var string
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*/
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protected $selectionId;
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/**
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* Options for current request
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*
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* @var array
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*/
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protected $options = null;
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/**
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* @param Minify_CacheInterface $cache
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*/
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public function __construct(Minify_CacheInterface $cache) {
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$this->cache = $cache;
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}
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/**
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* Get default Minify options.
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*
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* @return array options for Minify
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*/
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public function getDefaultOptions()
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{
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return array(
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'isPublic' => true,
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'encodeOutput' => function_exists('gzdeflate'),
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'encodeMethod' => null, // determine later
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'encodeLevel' => 9,
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'minifiers' => array(
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Minify::TYPE_JS => array('JSMin\\JSMin', 'minify'),
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Minify::TYPE_CSS => array('Minify_CSSmin', 'minify'),
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Minify::TYPE_HTML => array('Minify_HTML', 'minify'),
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),
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'minifierOptions' => array(), // no minifier options
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'contentTypeCharset' => 'utf-8',
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'maxAge' => 1800, // 30 minutes
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'rewriteCssUris' => true,
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'bubbleCssImports' => false,
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'quiet' => false, // serve() will send headers and output
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'debug' => false,
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'concatOnly' => false,
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// if you override these, the response codes MUST be directly after
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// the first space.
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'badRequestHeader' => 'HTTP/1.0 400 Bad Request',
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'errorHeader' => 'HTTP/1.0 500 Internal Server Error',
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// callback function to see/modify content of all sources
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'postprocessor' => null,
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// file to require to load preprocessor
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'postprocessorRequire' => null,
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/**
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* If this string is not empty AND the serve() option 'bubbleCssImports' is
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* NOT set, then serve() will check CSS files for @import declarations that
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* appear too late in the combined stylesheet. If found, serve() will prepend
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* the output with this warning.
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*/
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'importWarning' => "/* See https://github.com/mrclay/minify/blob/master/docs/CommonProblems.wiki.md#imports-can-appear-in-invalid-locations-in-combined-css-files */\n"
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);
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}
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/**
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* Serve a request for a minified file.
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*
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* Here are the available options and defaults:
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*
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* 'isPublic' : send "public" instead of "private" in Cache-Control
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* headers, allowing shared caches to cache the output. (default true)
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*
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* 'quiet' : set to true to have serve() return an array rather than sending
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* any headers/output (default false)
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*
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* 'encodeOutput' : set to false to disable content encoding, and not send
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* the Vary header (default true)
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*
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* 'encodeMethod' : generally you should let this be determined by
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* HTTP_Encoder (leave null), but you can force a particular encoding
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* to be returned, by setting this to 'gzip' or '' (no encoding)
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*
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* 'encodeLevel' : level of encoding compression (0 to 9, default 9)
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*
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* 'contentTypeCharset' : appended to the Content-Type header sent. Set to a falsey
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* value to remove. (default 'utf-8')
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*
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* 'maxAge' : set this to the number of seconds the client should use its cache
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* before revalidating with the server. This sets Cache-Control: max-age and the
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* Expires header. Unlike the old 'setExpires' setting, this setting will NOT
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* prevent conditional GETs. Note this has nothing to do with server-side caching.
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*
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* 'rewriteCssUris' : If true, serve() will automatically set the 'currentDir'
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* minifier option to enable URI rewriting in CSS files (default true)
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*
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* 'bubbleCssImports' : If true, all @import declarations in combined CSS
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* files will be move to the top. Note this may alter effective CSS values
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* due to a change in order. (default false)
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*
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* 'debug' : set to true to minify all sources with the 'Lines' controller, which
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* eases the debugging of combined files. This also prevents 304 responses.
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* @see Minify_Lines::minify()
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*
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* 'concatOnly' : set to true to disable minification and simply concatenate the files.
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* For JS, no minifier will be used. For CSS, only URI rewriting is still performed.
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*
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* 'minifiers' : to override Minify's default choice of minifier function for
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* a particular content-type, specify your callback under the key of the
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* content-type:
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* <code>
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* // call customCssMinifier($css) for all CSS minification
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* $options['minifiers'][Minify::TYPE_CSS] = 'customCssMinifier';
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*
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* // don't minify Javascript at all
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* $options['minifiers'][Minify::TYPE_JS] = '';
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* </code>
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*
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* 'minifierOptions' : to send options to the minifier function, specify your options
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* under the key of the content-type. E.g. To send the CSS minifier an option:
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* <code>
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* // give CSS minifier array('optionName' => 'optionValue') as 2nd argument
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* $options['minifierOptions'][Minify::TYPE_CSS]['optionName'] = 'optionValue';
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* </code>
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*
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* 'contentType' : (optional) this is only needed if your file extension is not
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* js/css/html. The given content-type will be sent regardless of source file
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* extension, so this should not be used in a Groups config with other
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* Javascript/CSS files.
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*
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* 'importWarning' : serve() will check CSS files for @import declarations that
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* appear too late in the combined stylesheet. If found, serve() will prepend
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* the output with this warning. To disable this, set this option to empty string.
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*
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* Any controller options are documented in that controller's createConfiguration() method.
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*
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* @param Minify_ControllerInterface $controller instance of subclass of Minify_Controller_Base
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*
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* @param array $options controller/serve options
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*
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* @return null|array if the 'quiet' option is set to true, an array
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* with keys "success" (bool), "statusCode" (int), "content" (string), and
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* "headers" (array).
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*
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* @throws Exception
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*/
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public function serve(Minify_ControllerInterface $controller, $options = array())
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{
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$options = array_merge($this->getDefaultOptions(), $options);
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$config = $controller->createConfiguration($options);
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$this->sources = $config->getSources();
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$this->selectionId = $config->getSelectionId();
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$this->options = $this->analyzeSources($config->getOptions());
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// check request validity
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if (!$this->sources) {
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// invalid request!
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if (! $this->options['quiet']) {
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$this->errorExit($this->options['badRequestHeader'], self::URL_DEBUG);
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} else {
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list(,$statusCode) = explode(' ', $this->options['badRequestHeader']);
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return array(
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'success' => false,
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'statusCode' => (int)$statusCode,
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'content' => '',
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'headers' => array(),
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);
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}
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}
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$this->controller = $controller;
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if ($this->options['debug']) {
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$this->setupDebug();
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$this->options['maxAge'] = 0;
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}
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// determine encoding
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if ($this->options['encodeOutput']) {
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$sendVary = true;
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if ($this->options['encodeMethod'] !== null) {
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// controller specifically requested this
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$contentEncoding = $this->options['encodeMethod'];
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} else {
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// sniff request header
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// depending on what the client accepts, $contentEncoding may be
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// 'x-gzip' while our internal encodeMethod is 'gzip'. Calling
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// getAcceptedEncoding(false, false) leaves out compress and deflate as options.
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list($this->options['encodeMethod'], $contentEncoding) = HTTP_Encoder::getAcceptedEncoding(false, false);
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$sendVary = ! HTTP_Encoder::isBuggyIe();
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}
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} else {
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$this->options['encodeMethod'] = ''; // identity (no encoding)
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}
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// check client cache
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$cgOptions = array(
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'lastModifiedTime' => $this->options['lastModifiedTime'],
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'isPublic' => $this->options['isPublic'],
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'encoding' => $this->options['encodeMethod'],
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);
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if ($this->options['maxAge'] > 0) {
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$cgOptions['maxAge'] = $this->options['maxAge'];
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} elseif ($this->options['debug']) {
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$cgOptions['invalidate'] = true;
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}
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$cg = new HTTP_ConditionalGet($cgOptions);
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if ($cg->cacheIsValid) {
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// client's cache is valid
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if (! $this->options['quiet']) {
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$cg->sendHeaders();
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return;
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} else {
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return array(
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'success' => true,
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'statusCode' => 304,
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'content' => '',
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'headers' => $cg->getHeaders(),
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);
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}
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} else {
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// client will need output
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$headers = $cg->getHeaders();
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unset($cg);
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}
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if ($this->options['contentType'] === self::TYPE_CSS && $this->options['rewriteCssUris']) {
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$this->setupUriRewrites();
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}
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if ($this->options['concatOnly']) {
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$this->options['minifiers'][self::TYPE_JS] = false;
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foreach ($this->sources as $key => $source) {
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if ($this->options['contentType'] === self::TYPE_JS) {
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$source->setMinifier("");
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} elseif ($this->options['contentType'] === self::TYPE_CSS) {
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$source->setMinifier(array('Minify_CSSmin', 'minify'));
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$sourceOpts = $source->getMinifierOptions();
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$sourceOpts['compress'] = false;
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$source->setMinifierOptions($sourceOpts);
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}
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}
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}
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// check server cache
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if (! $this->options['debug']) {
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// using cache
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// the goal is to use only the cache methods to sniff the length and
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// output the content, as they do not require ever loading the file into
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// memory.
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$cacheId = $this->_getCacheId();
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$fullCacheId = ($this->options['encodeMethod']) ? $cacheId . '.gz' : $cacheId;
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// check cache for valid entry
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$cacheIsReady = $this->cache->isValid($fullCacheId, $this->options['lastModifiedTime']);
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if ($cacheIsReady) {
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$cacheContentLength = $this->cache->getSize($fullCacheId);
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} else {
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// generate & cache content
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try {
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$content = $this->combineMinify();
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} catch (Exception $e) {
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$this->controller->log($e->getMessage());
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if (! $this->options['quiet']) {
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$this->errorExit($this->options['errorHeader'], self::URL_DEBUG);
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}
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throw $e;
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}
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$this->cache->store($cacheId, $content);
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if (function_exists('gzencode') && $this->options['encodeMethod']) {
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$this->cache->store($cacheId . '.gz', gzencode($content, $this->options['encodeLevel']));
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}
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}
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} else {
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// no cache
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$cacheIsReady = false;
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try {
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$content = $this->combineMinify();
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} catch (Exception $e) {
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$this->controller->log($e->getMessage());
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if (! $this->options['quiet']) {
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$this->errorExit($this->options['errorHeader'], self::URL_DEBUG);
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}
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throw $e;
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}
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}
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if (! $cacheIsReady && $this->options['encodeMethod']) {
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// still need to encode
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$content = gzencode($content, $this->options['encodeLevel']);
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}
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// add headers
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if ($cacheIsReady) {
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$headers['Content-Length'] = $cacheContentLength;
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} else {
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if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) {
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$headers['Content-Length'] = mb_strlen($content, '8bit');
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} else {
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$headers['Content-Length'] = strlen($content);
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}
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}
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$headers['Content-Type'] = $this->options['contentType'];
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if ($this->options['contentTypeCharset']) {
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$headers['Content-Type'] .= '; charset=' . $this->options['contentTypeCharset'];
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}
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if ($this->options['encodeMethod'] !== '') {
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$headers['Content-Encoding'] = $contentEncoding;
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}
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if ($this->options['encodeOutput'] && $sendVary) {
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$headers['Vary'] = 'Accept-Encoding';
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}
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if (! $this->options['quiet']) {
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// output headers & content
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foreach ($headers as $name => $val) {
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header($name . ': ' . $val);
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}
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if ($cacheIsReady) {
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$this->cache->display($fullCacheId);
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} else {
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echo $content;
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}
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} else {
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return array(
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'success' => true,
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'statusCode' => 200,
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'content' => $cacheIsReady ? $this->cache->fetch($fullCacheId) : $content,
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'headers' => $headers,
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);
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}
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}
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/**
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* Return combined minified content for a set of sources
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*
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* No internal caching will be used and the content will not be HTTP encoded.
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*
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* @param array $sources array of filepaths and/or Minify_Source objects
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*
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* @param array $options (optional) array of options for serve.
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*
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* @return string
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*/
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public function combine($sources, $options = array())
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{
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$tmpCache = $this->cache;
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$this->cache = new Minify_Cache_Null();
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$env = new Minify_Env();
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$sourceFactory = new Minify_Source_Factory($env, array(
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'checkAllowDirs' => false,
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), $this->cache);
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$controller = new Minify_Controller_Files($env, $sourceFactory);
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$options = array_merge($options, array(
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'files' => (array)$sources,
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'quiet' => true,
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'encodeMethod' => '',
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'lastModifiedTime' => 0,
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));
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$out = $this->serve($controller, $options);
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$this->cache = $tmpCache;
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return $out['content'];
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}
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/**
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* Show an error page
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*
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* @param string $header Full header. E.g. 'HTTP/1.0 500 Internal Server Error'
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* @param string $url URL to direct the user to
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* @param string $msgHtml HTML message for the client
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*
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* @return void
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* @internal This is not part of the public API and is subject to change
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* @access private
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*/
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public function errorExit($header, $url = '', $msgHtml = '')
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{
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$url = htmlspecialchars($url, ENT_QUOTES);
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list(,$h1) = explode(' ', $header, 2);
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$h1 = htmlspecialchars($h1);
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// FastCGI environments require 3rd arg to header() to be set
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list(, $code) = explode(' ', $header, 3);
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header($header, true, $code);
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header('Content-Type: text/html; charset=utf-8');
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echo "<h1>$h1</h1>";
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if ($msgHtml) {
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echo $msgHtml;
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}
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if ($url) {
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echo "<p>Please see <a href='$url'>$url</a>.</p>";
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}
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exit;
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}
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/**
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* Setup CSS sources for URI rewriting
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*/
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protected function setupUriRewrites()
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{
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foreach($this->sources as $key => $source) {
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$file = $source->getFilePath();
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$minifyOptions = $source->getMinifierOptions();
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if ($file
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&& !isset($minifyOptions['currentDir'])
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&& !isset($minifyOptions['prependRelativePath'])
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) {
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$minifyOptions['currentDir'] = dirname($file);
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$source->setMinifierOptions($minifyOptions);
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}
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}
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}
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/**
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* Set up sources to use Minify_Lines
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*/
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protected function setupDebug()
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{
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foreach ($this->sources as $source) {
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$source->setMinifier(array('Minify_Lines', 'minify'));
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$id = $source->getId();
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$source->setMinifierOptions(array(
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'id' => (is_file($id) ? basename($id) : $id),
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));
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}
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}
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/**
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* Combines sources and minifies the result.
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*
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* @return string
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*
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* @throws Exception
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*/
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protected function combineMinify()
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{
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$type = $this->options['contentType']; // ease readability
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// when combining scripts, make sure all statements separated and
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// trailing single line comment is terminated
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$implodeSeparator = ($type === self::TYPE_JS) ? "\n;" : '';
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// allow the user to pass a particular array of options to each
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// minifier (designated by type). source objects may still override
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// these
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if (isset($this->options['minifierOptions'][$type])) {
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$defaultOptions = $this->options['minifierOptions'][$type];
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} else {
|
|
$defaultOptions = array();
|
|
}
|
|
|
|
// if minifier not set, default is no minification. source objects
|
|
// may still override this
|
|
if (isset($this->options['minifiers'][$type])) {
|
|
$defaultMinifier = $this->options['minifiers'][$type];
|
|
} else {
|
|
$defaultMinifier = false;
|
|
}
|
|
|
|
// process groups of sources with identical minifiers/options
|
|
$content = array();
|
|
$i = 0;
|
|
$l = count($this->sources);
|
|
$groupToProcessTogether = array();
|
|
$lastMinifier = null;
|
|
$lastOptions = null;
|
|
do {
|
|
// get next source
|
|
$source = null;
|
|
if ($i < $l) {
|
|
$source = $this->sources[$i];
|
|
$sourceContent = $source->getContent();
|
|
|
|
// allow the source to override our minifier and options
|
|
$minifier = $source->getMinifier();
|
|
if (!$minifier) {
|
|
$minifier = $defaultMinifier;
|
|
}
|
|
$options = array_merge($defaultOptions, $source->getMinifierOptions());
|
|
}
|
|
// do we need to process our group right now?
|
|
if ($i > 0 // yes, we have at least the first group populated
|
|
&& (
|
|
! $source // yes, we ran out of sources
|
|
|| $type === self::TYPE_CSS // yes, to process CSS individually (avoiding PCRE bugs/limits)
|
|
|| $minifier !== $lastMinifier // yes, minifier changed
|
|
|| $options !== $lastOptions) // yes, options changed
|
|
)
|
|
{
|
|
// minify previous sources with last settings
|
|
$imploded = implode($implodeSeparator, $groupToProcessTogether);
|
|
$groupToProcessTogether = array();
|
|
if ($lastMinifier) {
|
|
try {
|
|
$content[] = call_user_func($lastMinifier, $imploded, $lastOptions);
|
|
} catch (Exception $e) {
|
|
throw new Exception("Exception in minifier: " . $e->getMessage());
|
|
}
|
|
} else {
|
|
$content[] = $imploded;
|
|
}
|
|
}
|
|
// add content to the group
|
|
if ($source) {
|
|
$groupToProcessTogether[] = $sourceContent;
|
|
$lastMinifier = $minifier;
|
|
$lastOptions = $options;
|
|
}
|
|
$i++;
|
|
} while ($source);
|
|
|
|
$content = implode($implodeSeparator, $content);
|
|
|
|
if ($type === self::TYPE_CSS && false !== strpos($content, '@import')) {
|
|
$content = $this->handleCssImports($content);
|
|
}
|
|
|
|
// do any post-processing (esp. for editing build URIs)
|
|
if ($this->options['postprocessorRequire']) {
|
|
require_once $this->options['postprocessorRequire'];
|
|
}
|
|
if ($this->options['postprocessor']) {
|
|
$content = call_user_func($this->options['postprocessor'], $content, $type);
|
|
}
|
|
return $content;
|
|
}
|
|
|
|
/**
|
|
* Make a unique cache id for for this request.
|
|
*
|
|
* Any settings that could affect output are taken into consideration
|
|
*
|
|
* @param string $prefix
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function _getCacheId($prefix = 'minify')
|
|
{
|
|
$name = preg_replace('/[^a-zA-Z0-9\\.=_,]/', '', $this->selectionId);
|
|
$name = preg_replace('/\\.+/', '.', $name);
|
|
$name = substr($name, 0, 100 - 34 - strlen($prefix));
|
|
$md5 = md5(serialize(array(
|
|
Minify_SourceSet::getDigest($this->sources),
|
|
$this->options['minifiers'],
|
|
$this->options['minifierOptions'],
|
|
$this->options['postprocessor'],
|
|
$this->options['bubbleCssImports'],
|
|
Minify::VERSION,
|
|
)));
|
|
return "{$prefix}_{$name}_{$md5}";
|
|
}
|
|
|
|
/**
|
|
* Bubble CSS @imports to the top or prepend a warning if an import is detected not at the top.
|
|
*
|
|
* @param string $css
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function handleCssImports($css)
|
|
{
|
|
if ($this->options['bubbleCssImports']) {
|
|
// bubble CSS imports
|
|
preg_match_all('/@import.*?;/', $css, $imports);
|
|
$css = implode('', $imports[0]) . preg_replace('/@import.*?;/', '', $css);
|
|
return $css;
|
|
}
|
|
|
|
if ('' === $this->options['importWarning']) {
|
|
return $css;
|
|
}
|
|
|
|
// remove comments so we don't mistake { in a comment as a block
|
|
$noCommentCss = preg_replace('@/\\*[\\s\\S]*?\\*/@', '', $css);
|
|
$lastImportPos = strrpos($noCommentCss, '@import');
|
|
$firstBlockPos = strpos($noCommentCss, '{');
|
|
if (false !== $lastImportPos
|
|
&& false !== $firstBlockPos
|
|
&& $firstBlockPos < $lastImportPos
|
|
) {
|
|
// { appears before @import : prepend warning
|
|
$css = $this->options['importWarning'] . $css;
|
|
}
|
|
return $css;
|
|
}
|
|
|
|
/**
|
|
* Analyze sources (if there are any) and set $options 'contentType'
|
|
* and 'lastModifiedTime' if they already aren't.
|
|
*
|
|
* @param array $options options for Minify
|
|
*
|
|
* @return array options for Minify
|
|
*/
|
|
protected function analyzeSources($options = array())
|
|
{
|
|
if (!$this->sources) {
|
|
return $options;
|
|
}
|
|
|
|
$type = null;
|
|
foreach ($this->sources as $source) {
|
|
$sourceType = $source->getContentType();
|
|
|
|
if (!empty($options['contentType'])) {
|
|
// just verify sources have null content type or match the options
|
|
if ($sourceType !== null && $sourceType !== $options['contentType']) {
|
|
// TODO better logging
|
|
Minify_Logger::log('ContentType mismatch');
|
|
|
|
$this->sources = array();
|
|
return $options;
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
if ($type === null) {
|
|
$type = $sourceType;
|
|
} elseif ($sourceType !== $type) {
|
|
|
|
// TODO better logging
|
|
Minify_Logger::log('ContentType mismatch');
|
|
|
|
$this->sources = array();
|
|
return $options;
|
|
}
|
|
}
|
|
|
|
if (empty($options['contentType'])) {
|
|
if (null === $type) {
|
|
$type = 'text/plain';
|
|
}
|
|
$options['contentType'] = $type;
|
|
}
|
|
|
|
// last modified is needed for caching, even if setExpires is set
|
|
if (!isset($options['lastModifiedTime'])) {
|
|
$max = 0;
|
|
foreach ($this->sources as $source) {
|
|
$max = max($source->getLastModified(), $max);
|
|
}
|
|
$options['lastModifiedTime'] = $max;
|
|
}
|
|
|
|
return $options;
|
|
}
|
|
}
|