| 1 |
<?php |
| 2 |
|
| 3 |
/** |
| 4 |
* Abstract minifier class. |
| 5 |
* |
| 6 |
* Please report bugs on https://github.com/matthiasmullie/minify/issues |
| 7 |
* |
| 8 |
* @author Matthias Mullie <minify@mullie.eu> |
| 9 |
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
| 10 |
* @license MIT License |
| 11 |
*/ |
| 12 |
|
| 13 |
namespace MatthiasMullie\Minify; |
| 14 |
|
| 15 |
use MatthiasMullie\Minify\Exceptions\IOException; |
| 16 |
use MatthiasMullie\Minify\Exceptions\PatternMatchException; |
| 17 |
use Psr\Cache\CacheItemInterface; |
| 18 |
|
| 19 |
/** |
| 20 |
* Abstract minifier class. |
| 21 |
* |
| 22 |
* Please report bugs on https://github.com/matthiasmullie/minify/issues |
| 23 |
* |
| 24 |
* @author Matthias Mullie <minify@mullie.eu> |
| 25 |
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
| 26 |
* @license MIT License |
| 27 |
*/ |
| 28 |
abstract class Minify |
| 29 |
{ |
| 30 |
/** |
| 31 |
* The data to be minified. |
| 32 |
* |
| 33 |
* @var string[] |
| 34 |
*/ |
| 35 |
protected $data = array(); |
| 36 |
|
| 37 |
/** |
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* Array of patterns to match. |
| 39 |
* |
| 40 |
* @var string[] |
| 41 |
*/ |
| 42 |
protected $patterns = array(); |
| 43 |
|
| 44 |
/** |
| 45 |
* This array will hold content of strings and regular expressions that have |
| 46 |
* been extracted from the JS source code, so we can reliably match "code", |
| 47 |
* without having to worry about potential "code-like" characters inside. |
| 48 |
* |
| 49 |
* @internal |
| 50 |
* |
| 51 |
* @var string[] |
| 52 |
*/ |
| 53 |
public $extracted = array(); |
| 54 |
|
| 55 |
/** |
| 56 |
* Init the minify class - optionally, code may be passed along already. |
| 57 |
*/ |
| 58 |
public function __construct(/* $data = null, ... */) |
| 59 |
{ |
| 60 |
// it's possible to add the source through the constructor as well ;) |
| 61 |
if (func_num_args()) { |
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call_user_func_array(array($this, 'add'), func_get_args()); |
| 63 |
} |
| 64 |
} |
| 65 |
|
| 66 |
/** |
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* Add a file or straight-up code to be minified. |
| 68 |
* |
| 69 |
* @param string|string[] $data |
| 70 |
* |
| 71 |
* @return static |
| 72 |
*/ |
| 73 |
public function add($data /* $data = null, ... */) |
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{ |
| 75 |
// bogus "usage" of parameter $data: scrutinizer warns this variable is |
| 76 |
// not used (we're using func_get_args instead to support overloading), |
| 77 |
// but it still needs to be defined because it makes no sense to have |
| 78 |
// this function without argument :) |
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$args = array($data) + func_get_args(); |
| 80 |
|
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// this method can be overloaded |
| 82 |
foreach ($args as $data) { |
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if (is_array($data)) { |
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call_user_func_array(array($this, 'add'), $data); |
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continue; |
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} |
| 87 |
|
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// redefine var |
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$data = (string) $data; |
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|
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// load data |
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$value = $this->load($data); |
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$key = ($data != $value) ? $data : count($this->data); |
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|
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// replace CR linefeeds etc. |
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// @see https://github.com/matthiasmullie/minify/pull/139 |
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$value = str_replace(array("\r\n", "\r"), "\n", $value); |
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|
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// store data |
| 100 |
$this->data[$key] = $value; |
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} |
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|
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return $this; |
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} |
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|
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/** |
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* Add a file to be minified. |
| 108 |
* |
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* @param string|string[] $data |
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* |
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* @return static |
| 112 |
* |
| 113 |
* @throws IOException |
| 114 |
*/ |
| 115 |
public function addFile($data /* $data = null, ... */) |
| 116 |
{ |
| 117 |
// bogus "usage" of parameter $data: scrutinizer warns this variable is |
| 118 |
// not used (we're using func_get_args instead to support overloading), |
| 119 |
// but it still needs to be defined because it makes no sense to have |
| 120 |
// this function without argument :) |
| 121 |
$args = array($data) + func_get_args(); |
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|
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// this method can be overloaded |
| 124 |
foreach ($args as $path) { |
| 125 |
if (is_array($path)) { |
| 126 |
call_user_func_array(array($this, 'addFile'), $path); |
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continue; |
| 128 |
} |
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|
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// redefine var |
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$path = (string) $path; |
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|
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// check if we can read the file |
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if (!$this->canImportFile($path)) { |
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throw new IOException('The file "' . $path . '" could not be opened for reading. Check if PHP has enough permissions.'); |
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} |
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|
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$this->add($path); |
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} |
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|
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return $this; |
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} |
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|
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/** |
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* Minify the data & (optionally) saves it to a file. |
| 146 |
* |
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* @param string[optional] $path Path to write the data to |
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* |
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* @return string The minified data |
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*/ |
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public function minify($path = null) |
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{ |
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$content = $this->execute($path); |
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|
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// save to path |
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if ($path !== null) { |
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$this->save($content, $path); |
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} |
| 159 |
|
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return $content; |
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} |
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|
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/** |
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* Minify & gzip the data & (optionally) saves it to a file. |
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* |
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* @param string[optional] $path Path to write the data to |
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* @param int[optional] $level Compression level, from 0 to 9 |
| 168 |
* |
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* @return string The minified & gzipped data |
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*/ |
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public function gzip($path = null, $level = 9) |
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{ |
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$content = $this->execute($path); |
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$content = gzencode($content, $level, FORCE_GZIP); |
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|
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// save to path |
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if ($path !== null) { |
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$this->save($content, $path); |
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} |
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|
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return $content; |
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} |
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|
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/** |
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* Minify the data & write it to a CacheItemInterface object. |
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* |
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* @param CacheItemInterface $item Cache item to write the data to |
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* |
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* @return CacheItemInterface Cache item with the minifier data |
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*/ |
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public function cache(CacheItemInterface $item) |
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{ |
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$content = $this->execute(); |
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$item->set($content); |
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|
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return $item; |
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} |
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|
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/** |
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* Minify the data. |
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* |
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* @param string[optional] $path Path to write the data to |
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* |
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* @return string The minified data |
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*/ |
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abstract public function execute($path = null); |
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|
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/** |
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* Load data. |
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* |
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* @param string $data Either a path to a file or the content itself |
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* |
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* @return string |
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*/ |
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protected function load($data) |
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{ |
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// check if the data is a file |
| 218 |
if ($this->canImportFile($data)) { |
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$data = file_get_contents($data); |
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|
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// strip BOM, if any |
| 222 |
if (substr($data, 0, 3) == "\xef\xbb\xbf") { |
| 223 |
$data = substr($data, 3); |
| 224 |
} |
| 225 |
} |
| 226 |
|
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return $data; |
| 228 |
} |
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|
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/** |
| 231 |
* Save to file. |
| 232 |
* |
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* @param string $content The minified data |
| 234 |
* @param string $path The path to save the minified data to |
| 235 |
* |
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* @throws IOException |
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*/ |
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protected function save($content, $path) |
| 239 |
{ |
| 240 |
$handler = $this->openFileForWriting($path); |
| 241 |
|
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$this->writeToFile($handler, $content); |
| 243 |
|
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@fclose($handler); |
| 245 |
} |
| 246 |
|
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/** |
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* Register a pattern to execute against the source content. |
| 249 |
* |
| 250 |
* If $replacement is a string, it must be plain text. Placeholders like $1 or \2 don't work. |
| 251 |
* If you need that functionality, use a callback instead. |
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* |
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* @param string $pattern PCRE pattern |
| 254 |
* @param string|callable $replacement Replacement value for matched pattern |
| 255 |
*/ |
| 256 |
protected function registerPattern($pattern, $replacement = '') |
| 257 |
{ |
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// study the pattern, we'll execute it more than once |
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$pattern .= 'S'; |
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|
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$this->patterns[] = array($pattern, $replacement); |
| 262 |
} |
| 263 |
|
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/** |
| 265 |
* Both JS and CSS use the same form of multi-line comment, so putting the common code here. |
| 266 |
*/ |
| 267 |
protected function stripMultilineComments() |
| 268 |
{ |
| 269 |
$minifier = $this; |
| 270 |
// Pattern for matching comments that we want to preserve |
| 271 |
$keepPattern = '/^ |
| 272 |
# comment content |
| 273 |
(?: |
| 274 |
# either starts with an ! |
| 275 |
! |
| 276 |
| |
| 277 |
# or, after some number of characters which do not end the comment |
| 278 |
(?:(?!\*\/).)*? |
| 279 |
|
| 280 |
# there is either a @license or @preserve tag |
| 281 |
@(?:license|preserve) |
| 282 |
) |
| 283 |
/ixs'; |
| 284 |
$callback = function ($match) use ($minifier, $keepPattern) { |
| 285 |
if (preg_match($keepPattern, $match[1])) { |
| 286 |
// Preserve the comment |
| 287 |
$count = count($minifier->extracted); |
| 288 |
$placeholder = '/*' . $count . '*/'; |
| 289 |
$minifier->extracted[$placeholder] = $match[0]; |
| 290 |
} else { |
| 291 |
// Discard the comment but keep any single line feed |
| 292 |
$placeholder = strncmp($match[0], "\n", 1) === 0 || substr($match[0], -1) === "\n" |
| 293 |
? "\n" |
| 294 |
: ''; |
| 295 |
} |
| 296 |
|
| 297 |
return $placeholder; |
| 298 |
}; |
| 299 |
|
| 300 |
$this->registerPattern('/\n?\/\*(.*?)\*\/\n?/s', $callback); |
| 301 |
} |
| 302 |
|
| 303 |
/** |
| 304 |
* We can't "just" run some regular expressions against JavaScript: it's a |
| 305 |
* complex language. E.g. having an occurrence of // xyz would be a comment, |
| 306 |
* unless it's used within a string. Of you could have something that looks |
| 307 |
* like a 'string', but inside a comment. |
| 308 |
* The only way to accurately replace these pieces is to traverse the JS one |
| 309 |
* character at a time and try to find whatever starts first. |
| 310 |
* |
| 311 |
* @param string $content The content to replace patterns in |
| 312 |
* |
| 313 |
* @return string The (manipulated) content |
| 314 |
* |
| 315 |
* @throws PatternMatchException |
| 316 |
*/ |
| 317 |
protected function replace($content) |
| 318 |
{ |
| 319 |
$contentLength = strlen($content); |
| 320 |
$output = ''; |
| 321 |
$processedOffset = 0; |
| 322 |
$positions = array_fill(0, count($this->patterns), -1); |
| 323 |
$matches = array(); |
| 324 |
|
| 325 |
while ($processedOffset < $contentLength) { |
| 326 |
// find first match for all patterns |
| 327 |
foreach ($this->patterns as $i => $pattern) { |
| 328 |
list($pattern, $replacement) = $pattern; |
| 329 |
|
| 330 |
// we can safely ignore patterns for positions we've unset earlier, |
| 331 |
// because we know these won't show up anymore |
| 332 |
if (array_key_exists($i, $positions) == false) { |
| 333 |
continue; |
| 334 |
} |
| 335 |
|
| 336 |
// no need to re-run matches that are still in the part of the |
| 337 |
// content that hasn't been processed |
| 338 |
if ($positions[$i] >= $processedOffset) { |
| 339 |
continue; |
| 340 |
} |
| 341 |
|
| 342 |
$match = null; |
| 343 |
$matchResult = preg_match($pattern, $content, $match, PREG_OFFSET_CAPTURE, $processedOffset); |
| 344 |
if ($matchResult) { |
| 345 |
$matches[$i] = $match; |
| 346 |
|
| 347 |
// we'll store the match position as well; that way, we |
| 348 |
// don't have to redo all preg_matches after changing only |
| 349 |
// the first (we'll still know where those others are) |
| 350 |
$positions[$i] = $match[0][1]; |
| 351 |
} else { |
| 352 |
if ($matchResult === false) { |
| 353 |
throw PatternMatchException::fromLastError( |
| 354 |
"Failed to match pattern '$pattern' at $processedOffset" |
| 355 |
); |
| 356 |
} |
| 357 |
// if the pattern couldn't be matched, there's no point in |
| 358 |
// executing it again in later runs on this same content; |
| 359 |
// ignore this one until we reach end of content |
| 360 |
unset($matches[$i], $positions[$i]); |
| 361 |
} |
| 362 |
} |
| 363 |
|
| 364 |
// no more matches to find: everything's been processed, break out |
| 365 |
if (!$matches) { |
| 366 |
// output the remaining content |
| 367 |
$output .= substr($content, $processedOffset); |
| 368 |
break; |
| 369 |
} |
| 370 |
|
| 371 |
// see which of the patterns actually found the first thing (we'll |
| 372 |
// only want to execute that one, since we're unsure if what the |
| 373 |
// other found was not inside what the first found) |
| 374 |
$matchOffset = min($positions); |
| 375 |
$firstPattern = array_search($matchOffset, $positions); |
| 376 |
$match = $matches[$firstPattern]; |
| 377 |
|
| 378 |
// execute the pattern that matches earliest in the content string |
| 379 |
list(, $replacement) = $this->patterns[$firstPattern]; |
| 380 |
|
| 381 |
// add the part of the input between $processedOffset and the first match; |
| 382 |
// that content wasn't matched by anything |
| 383 |
$output .= substr($content, $processedOffset, $matchOffset - $processedOffset); |
| 384 |
// add the replacement for the match |
| 385 |
$output .= $this->executeReplacement($replacement, $match); |
| 386 |
// advance $processedOffset past the match |
| 387 |
$processedOffset = $matchOffset + strlen($match[0][0]); |
| 388 |
} |
| 389 |
|
| 390 |
return $output; |
| 391 |
} |
| 392 |
|
| 393 |
/** |
| 394 |
* If $replacement is a callback, execute it, passing in the match data. |
| 395 |
* If it's a string, just pass it through. |
| 396 |
* |
| 397 |
* @param string|callable $replacement Replacement value |
| 398 |
* @param array $match Match data, in PREG_OFFSET_CAPTURE form |
| 399 |
* |
| 400 |
* @return string |
| 401 |
*/ |
| 402 |
protected function executeReplacement($replacement, $match) |
| 403 |
{ |
| 404 |
if (!is_callable($replacement)) { |
| 405 |
return $replacement; |
| 406 |
} |
| 407 |
// convert $match from the PREG_OFFSET_CAPTURE form to the form the callback expects |
| 408 |
foreach ($match as &$matchItem) { |
| 409 |
$matchItem = $matchItem[0]; |
| 410 |
} |
| 411 |
|
| 412 |
return $replacement($match); |
| 413 |
} |
| 414 |
|
| 415 |
/** |
| 416 |
* Strings are a pattern we need to match, in order to ignore potential |
| 417 |
* code-like content inside them, but we just want all of the string |
| 418 |
* content to remain untouched. |
| 419 |
* |
| 420 |
* This method will replace all string content with simple STRING# |
| 421 |
* placeholder text, so we've rid all strings from characters that may be |
| 422 |
* misinterpreted. Original string content will be saved in $this->extracted |
| 423 |
* and after doing all other minifying, we can restore the original content |
| 424 |
* via restoreStrings(). |
| 425 |
* |
| 426 |
* @param string[optional] $chars |
| 427 |
* @param string[optional] $placeholderPrefix |
| 428 |
*/ |
| 429 |
protected function extractStrings($chars = '\'"', $placeholderPrefix = '') |
| 430 |
{ |
| 431 |
// PHP only supports $this inside anonymous functions since 5.4 |
| 432 |
$minifier = $this; |
| 433 |
$callback = function ($match) use ($minifier, $placeholderPrefix) { |
| 434 |
// check the second index here, because the first always contains a quote |
| 435 |
if ($match[2] === '') { |
| 436 |
/* |
| 437 |
* Empty strings need no placeholder; they can't be confused for |
| 438 |
* anything else anyway. |
| 439 |
* But we still needed to match them, for the extraction routine |
| 440 |
* to skip over this particular string. |
| 441 |
*/ |
| 442 |
return $match[0]; |
| 443 |
} |
| 444 |
|
| 445 |
$count = count($minifier->extracted); |
| 446 |
$placeholder = $match[1] . $placeholderPrefix . $count . $match[1]; |
| 447 |
$minifier->extracted[$placeholder] = $match[1] . $match[2] . $match[1]; |
| 448 |
|
| 449 |
return $placeholder; |
| 450 |
}; |
| 451 |
|
| 452 |
/* |
| 453 |
* Quantifier {0,65535} is used instead of *? to avoid exceeding |
| 454 |
* backtrack limit with large strings. 65535 is the maximum allowed |
| 455 |
* (see https://www.php.net/manual/en/regexp.reference.repetition.php) |
| 456 |
* and should be well sufficient for string representations here. |
| 457 |
* |
| 458 |
* The \\ messiness explained: |
| 459 |
* * Don't count ' or " as end-of-string if it's escaped (has backslash |
| 460 |
* in front of it) |
| 461 |
* * Unless... that backslash itself is escaped (another leading slash), |
| 462 |
* in which case it's no longer escaping the ' or " |
| 463 |
* * So there can be either no backslash, or an even number |
| 464 |
* * multiply all of that times 4, to account for the escaping that has |
| 465 |
* to be done to pass the backslash into the PHP string without it being |
| 466 |
* considered as escape-char (times 2) and to get it in the regex, |
| 467 |
* escaped (times 2) |
| 468 |
*/ |
| 469 |
|
| 470 |
$this->registerPattern('/([' . $chars . '])(.{0,65535}?(?<!\\\\)(\\\\\\\\)*+)\\1/s', $callback); |
| 471 |
} |
| 472 |
|
| 473 |
/** |
| 474 |
* This method will restore all extracted data (strings, regexes) that were |
| 475 |
* replaced with placeholder text in extract*(). The original content was |
| 476 |
* saved in $this->extracted. |
| 477 |
* |
| 478 |
* @param string $content |
| 479 |
* |
| 480 |
* @return string |
| 481 |
*/ |
| 482 |
protected function restoreExtractedData($content) |
| 483 |
{ |
| 484 |
if (!$this->extracted) { |
| 485 |
// nothing was extracted, nothing to restore |
| 486 |
return $content; |
| 487 |
} |
| 488 |
|
| 489 |
$content = strtr($content, $this->extracted); |
| 490 |
|
| 491 |
$this->extracted = array(); |
| 492 |
|
| 493 |
return $content; |
| 494 |
} |
| 495 |
|
| 496 |
/** |
| 497 |
* Check if the path is a regular file and can be read. |
| 498 |
* |
| 499 |
* @param string $path |
| 500 |
* |
| 501 |
* @return bool |
| 502 |
*/ |
| 503 |
protected function canImportFile($path) |
| 504 |
{ |
| 505 |
$parsed = parse_url($path); |
| 506 |
if ( |
| 507 |
// file is elsewhere |
| 508 |
isset($parsed['host']) |
| 509 |
// file responds to queries (may change, or need to bypass cache) |
| 510 |
|| isset($parsed['query']) |
| 511 |
) { |
| 512 |
return false; |
| 513 |
} |
| 514 |
|
| 515 |
try { |
| 516 |
return strlen($path) < PHP_MAXPATHLEN && @is_file($path) && is_readable($path); |
| 517 |
} |
| 518 |
// catch openbasedir exceptions which are not caught by @ on is_file() |
| 519 |
catch (\Exception $e) { |
| 520 |
return false; |
| 521 |
} |
| 522 |
} |
| 523 |
|
| 524 |
/** |
| 525 |
* Attempts to open file specified by $path for writing. |
| 526 |
* |
| 527 |
* @param string $path The path to the file |
| 528 |
* |
| 529 |
* @return resource Specifier for the target file |
| 530 |
* |
| 531 |
* @throws IOException |
| 532 |
*/ |
| 533 |
protected function openFileForWriting($path) |
| 534 |
{ |
| 535 |
if ($path === '' || ($handler = @fopen($path, 'w')) === false) { |
| 536 |
throw new IOException('The file "' . $path . '" could not be opened for writing. Check if PHP has enough permissions.'); |
| 537 |
} |
| 538 |
|
| 539 |
return $handler; |
| 540 |
} |
| 541 |
|
| 542 |
/** |
| 543 |
* Attempts to write $content to the file specified by $handler. $path is used for printing exceptions. |
| 544 |
* |
| 545 |
* @param resource $handler The resource to write to |
| 546 |
* @param string $content The content to write |
| 547 |
* @param string $path The path to the file (for exception printing only) |
| 548 |
* |
| 549 |
* @throws IOException |
| 550 |
*/ |
| 551 |
protected function writeToFile($handler, $content, $path = '') |
| 552 |
{ |
| 553 |
if ( |
| 554 |
!is_resource($handler) |
| 555 |
|| ($result = @fwrite($handler, $content)) === false |
| 556 |
|| ($result < strlen($content)) |
| 557 |
) { |
| 558 |
throw new IOException('The file "' . $path . '" could not be written to. Check your disk space and file permissions.'); |
| 559 |
} |
| 560 |
} |
| 561 |
|
| 562 |
protected static function str_replace_first($search, $replace, $subject) |
| 563 |
{ |
| 564 |
$pos = strpos($subject, $search); |
| 565 |
if ($pos !== false) { |
| 566 |
return substr_replace($subject, $replace, $pos, strlen($search)); |
| 567 |
} |
| 568 |
|
| 569 |
return $subject; |
| 570 |
} |
| 571 |
} |
| 572 |
|
