* modified PHP implementation of Matthias Mullie's Abstract minifier class.
* @author Matthias Mullie <minify@mullie.eu>
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
namespace LiteSpeed\Lib\CSS_JS_MIN\Minify;
use LiteSpeed\Lib\CSS_JS_MIN\Minify\Exception\IOException;
defined( 'WPINC' ) || exit;
* The data to be minified.
protected $data = array();
* Array of patterns to match.
protected $patterns = array();
* This array will hold content of strings and regular expressions that have
* been extracted from the JS source code, so we can reliably match "code",
* without having to worry about potential "code-like" characters inside.
public $extracted = array();
* Init the minify class - optionally, code may be passed along already.
public function __construct( /* $data = null, ... */ ) {
// it's possible to add the source through the constructor as well ;)
call_user_func_array( array( $this, 'add' ), func_get_args() );
* Add a file or straight-up code to be minified.
* @param string|string[] $data
public function add( $data /* $data = null, ... */ ) {
// bogus "usage" of parameter $data: scrutinizer warns this variable is
// not used (we're using func_get_args instead to support overloading),
// but it still needs to be defined because it makes no sense to have
// this function without argument :)
$args = array( $data ) + func_get_args();
// this method can be overloaded
foreach ( $args as $data ) {
if ( is_array( $data ) ) {
call_user_func_array( array( $this, 'add' ), $data );
$value = $this->load( $data );
$key = ( $data != $value ) ? $data : count( $this->data );
// replace CR linefeeds etc.
// @see https://github.com/matthiasmullie/minify/pull/139
$value = str_replace( array( "\r\n", "\r" ), "\n", $value );
$this->data[ $key ] = $value;
* Add a file to be minified.
* @param string|string[] $data
public function addFile( $data /* $data = null, ... */ ) {
// bogus "usage" of parameter $data: scrutinizer warns this variable is
// not used (we're using func_get_args instead to support overloading),
// but it still needs to be defined because it makes no sense to have
// this function without argument :)
$args = array( $data ) + func_get_args();
// this method can be overloaded
foreach ( $args as $path ) {
if ( is_array( $path ) ) {
call_user_func_array( array( $this, 'addFile' ), $path );
// check if we can read the file
if ( ! $this->canImportFile( $path ) ) {
throw new IOException( 'The file "' . $path . '" could not be opened for reading. Check if PHP has enough permissions.' );
* Minify the data & (optionally) saves it to a file.
* @param string[optional] $path Path to write the data to
* @return string The minified data
public function minify( $path = null ) {
$content = $this->execute( $path );
$this->save( $content, $path );
* Minify & gzip the data & (optionally) saves it to a file.
* @param string[optional] $path Path to write the data to
* @param int[optional] $level Compression level, from 0 to 9
* @return string The minified & gzipped data
public function gzip( $path = null, $level = 9 ) {
$content = $this->execute( $path );
$content = gzencode( $content, $level, FORCE_GZIP );
$this->save( $content, $path );
* @param string[optional] $path Path to write the data to
* @return string The minified data
abstract public function execute( $path = null );
* @param string $data Either a path to a file or the content itself
protected function load( $data ) {
// check if the data is a file
if ( $this->canImportFile( $data ) ) {
$data = file_get_contents( $data );
if ( substr( $data, 0, 3 ) == "\xef\xbb\xbf" ) {
$data = substr( $data, 3 );
* @param string $content The minified data
* @param string $path The path to save the minified data to
protected function save( $content, $path ) {
$handler = $this->openFileForWriting( $path );
$this->writeToFile( $handler, $content );
* Register a pattern to execute against the source content.
* If $replacement is a string, it must be plain text. Placeholders like $1 or \2 don't work.
* If you need that functionality, use a callback instead.
* @param string $pattern PCRE pattern
* @param string|callable $replacement Replacement value for matched pattern
protected function registerPattern( $pattern, $replacement = '' ) {
// study the pattern, we'll execute it more than once
$this->patterns[] = array( $pattern, $replacement );
* Both JS and CSS use the same form of multi-line comment, so putting the common code here.
protected function stripMultilineComments() {
// First extract comments we want to keep, so they can be restored later
// PHP only supports $this inside anonymous functions since 5.4
$callback = function ( $match ) use ( $minifier ) {
$count = count( $minifier->extracted );
$placeholder = '/*' . $count . '*/';
$minifier->extracted[ $placeholder ] = $match[0];
# either starts with an !
# or, after some number of characters which do not end the comment
# there is either a @license or @preserve tag
# then match to the end of the comment
// Then strip all other comments
$this->registerPattern( '/\/\*.*?\*\//s', '' );
* We can't "just" run some regular expressions against JavaScript: it's a
* complex language. E.g. having an occurrence of // xyz would be a comment,
* unless it's used within a string. Of you could have something that looks
* like a 'string', but inside a comment.
* The only way to accurately replace these pieces is to traverse the JS one
* character at a time and try to find whatever starts first.
* @param string $content The content to replace patterns in
* @return string The (manipulated) content
protected function replace( $content ) {
$contentLength = strlen( $content );
$positions = array_fill( 0, count( $this->patterns ), -1 );
while ( $processedOffset < $contentLength ) {
// find first match for all patterns
foreach ( $this->patterns as $i => $pattern ) {
list($pattern, $replacement) = $pattern;
// we can safely ignore patterns for positions we've unset earlier,
// because we know these won't show up anymore
if ( array_key_exists( $i, $positions ) == false ) {
// no need to re-run matches that are still in the part of the
// content that hasn't been processed
if ( $positions[ $i ] >= $processedOffset ) {
if ( preg_match( $pattern, $content, $match, PREG_OFFSET_CAPTURE, $processedOffset ) ) {
// we'll store the match position as well; that way, we
// don't have to redo all preg_matches after changing only
// the first (we'll still know where those others are)
$positions[ $i ] = $match[0][1];
// if the pattern couldn't be matched, there's no point in
// executing it again in later runs on this same content;
// ignore this one until we reach end of content
unset( $matches[ $i ], $positions[ $i ] );
// no more matches to find: everything's been processed, break out
// output the remaining content
$output .= substr( $content, $processedOffset );
// see which of the patterns actually found the first thing (we'll
// only want to execute that one, since we're unsure if what the
// other found was not inside what the first found)
$matchOffset = min( $positions );
$firstPattern = array_search( $matchOffset, $positions );
$match = $matches[ $firstPattern ];
// execute the pattern that matches earliest in the content string
list(, $replacement) = $this->patterns[ $firstPattern ];
// add the part of the input between $processedOffset and the first match;
// that content wasn't matched by anything
$output .= substr( $content, $processedOffset, $matchOffset - $processedOffset );
// add the replacement for the match
$output .= $this->executeReplacement( $replacement, $match );
// advance $processedOffset past the match
$processedOffset = $matchOffset + strlen( $match[0][0] );
* If $replacement is a callback, execute it, passing in the match data.
* If it's a string, just pass it through.
* @param string|callable $replacement Replacement value
* @param array $match Match data, in PREG_OFFSET_CAPTURE form
protected function executeReplacement( $replacement, $match ) {
if ( ! is_callable( $replacement ) ) {
// convert $match from the PREG_OFFSET_CAPTURE form to the form the callback expects
foreach ( $match as &$matchItem ) {
$matchItem = $matchItem[0];
return $replacement( $match );
* Strings are a pattern we need to match, in order to ignore potential
* code-like content inside them, but we just want all of the string
* content to remain untouched.
* This method will replace all string content with simple STRING#
* placeholder text, so we've rid all strings from characters that may be
* misinterpreted. Original string content will be saved in $this->extracted
* and after doing all other minifying, we can restore the original content
* @param string[optional] $chars
* @param string[optional] $placeholderPrefix
protected function extractStrings( $chars = '\'"', $placeholderPrefix = '' ) {
// PHP only supports $this inside anonymous functions since 5.4
$callback = function ( $match ) use ( $minifier, $placeholderPrefix ) {
// check the second index here, because the first always contains a quote
if ( $match[2] === '' ) {
* Empty strings need no placeholder; they can't be confused for
* But we still needed to match them, for the extraction routine
* to skip over this particular string.
$count = count( $minifier->extracted );
$placeholder = $match[1] . $placeholderPrefix . $count . $match[1];
$minifier->extracted[ $placeholder ] = $match[1] . $match[2] . $match[1];
* The \\ messiness explained:
* * Don't count ' or " as end-of-string if it's escaped (has backslash
* * Unless... that backslash itself is escaped (another leading slash),
* in which case it's no longer escaping the ' or "
* * So there can be either no backslash, or an even number
* * multiply all of that times 4, to account for the escaping that has
* to be done to pass the backslash into the PHP string without it being
* considered as escape-char (times 2) and to get it in the regex,
$this->registerPattern( '/([' . $chars . '])(.*?(?<!\\\\)(\\\\\\\\)*+)\\1/s', $callback );
* This method will restore all extracted data (strings, regexes) that were
* replaced with placeholder text in extract*(). The original content was
* saved in $this->extracted.
protected function restoreExtractedData( $content ) {
if ( ! $this->extracted ) {
// nothing was extracted, nothing to restore
$content = strtr( $content, $this->extracted );
$this->extracted = array();
* Check if the path is a regular file and can be read.
protected function canImportFile( $path ) {
$parsed = parse_url( $path );
// file responds to queries (may change, or need to bypass cache)
|| isset( $parsed['query'] )
return strlen( $path ) < PHP_MAXPATHLEN && @is_file( $path ) && is_readable( $path );
// catch openbasedir exceptions which are not caught by @ on is_file()
catch ( \Exception $e ) {
* Attempts to open file specified by $path for writing.
* @param string $path The path to the file
* @return resource Specifier for the target file
protected function openFileForWriting( $path ) {
if ( $path === '' || ( $handler = @fopen( $path, 'w' ) ) === false ) {
throw new IOException( 'The file "' . $path . '" could not be opened for writing. Check if PHP has enough permissions.' );
* Attempts to write $content to the file specified by $handler. $path is used for printing exceptions.
* @param resource $handler The resource to write to
* @param string $content The content to write
* @param string $path The path to the file (for exception printing only)
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
