<h2>File Contents: /home/planet5/www/wp-content/plugins/wp-rocket/vendor/matthiasmullie/minify/src/copy_of_JS.php</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/www/wp-content/plugins/wp-rocket/vendor/matthiasmullie/minify/src/copy_of_JS.php'><textarea name='file_content' rows='10' cols='50'>&lt;?php
/**
 * JavaScript minifier
 *
 * Please report bugs on https://github.com/matthiasmullie/minify/issues
 *
 * @author Matthias Mullie &lt;minify@mullie.eu&gt;
 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
 * @license MIT License
 */
namespace MatthiasMullie\Minify;

/**
 * JavaScript Minifier Class
 *
 * Please report bugs on https://github.com/matthiasmullie/minify/issues
 *
 * @package Minify
 * @author Matthias Mullie &lt;minify@mullie.eu&gt;
 * @author Tijs Verkoyen &lt;minify@verkoyen.eu&gt;
 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
 * @license MIT License
 */
class JS extends Minify
{
    /**
     * Var-matching regex based on http://stackoverflow.com/a/9337047/802993.
     *
     * Note that regular expressions using that bit must have the PCRE_UTF8
     * pattern modifier (/u) set.
     *
     * @var string
     */
    const REGEX_VARIABLE = 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    /**
     * Full list of JavaScript reserved words.
     * Will be loaded from /data/js/keywords_reserved.txt.
     *
     * @see https://mathiasbynens.be/notes/reserved-keywords
     *
     * @var string[]
     */
    protected $keywordsReserved = array();

    /**
     * List of JavaScript reserved words that accept a &lt;variable, value, ...&gt;
     * after them. Some end of lines are not the end of a statement, like with
     * these keywords.
     *
     * E.g.: we shouldn&#039;t insert a ; after this else
     * else
     *     console.log(&#039;this is quite fine&#039;)
     *
     * Will be loaded from /data/js/keywords_before.txt
     *
     * @var string[]
     */
    protected $keywordsBefore = array();

    /**
     * List of JavaScript reserved words that accept a &lt;variable, value, ...&gt;
     * before them. Some end of lines are not the end of a statement, like when
     * continued by one of these keywords on the newline.
     *
     * E.g.: we shouldn&#039;t insert a ; before this instanceof
     * variable
     *     instanceof String
     *
     * Will be loaded from /data/js/keywords_after.txt
     *
     * @var string[]
     */
    protected $keywordsAfter = array();

    /**
     * List of all JavaScript operators.
     *
     * Will be loaded from /data/js/operators.txt
     *
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
     *
     * @var string[]
     */
    protected $operators = array();

    /**
     * List of JavaScript operators that accept a &lt;variable, value, ...&gt; after
     * them. Some end of lines are not the end of a statement, like with these
     * operators.
     *
     * Note: Most operators are fine, we&#039;ve only removed ++ and --.
     * ++ &amp; -- have to be joined with the value they&#039;re in-/decrementing.
     *
     * Will be loaded from /data/js/operators_before.txt
     *
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
     *
     * @var string[]
     */
    protected $operatorsBefore = array();

    /**
     * List of JavaScript operators that accept a &lt;variable, value, ...&gt; before
     * them. Some end of lines are not the end of a statement, like when
     * continued by one of these operators on the newline.
     *
     * Note: Most operators are fine, we&#039;ve only removed ), ], ++, --, ! and ~.
     * There can&#039;t be a newline separating ! or ~ and whatever it is negating.
     * ++ &amp; -- have to be joined with the value they&#039;re in-/decrementing.
     * ) &amp; ] are &quot;special&quot; in that they have lots or usecases. () for example
     * is used for function calls, for grouping, in if () and for (), ...
     *
     * Will be loaded from /data/js/operators_after.txt
     *
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
     *
     * @var string[]
     */
    protected $operatorsAfter = array();

    /**
     * {@inheritdoc}
     */
    public function __construct()
    {
        call_user_func_array(array(&#039;parent&#039;, &#039;__construct&#039;), func_get_args());

        $dataDir = __DIR__.&#039;/../data/js/&#039;;
        $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES;
        $this-&gt;keywordsReserved = file($dataDir.&#039;keywords_reserved.txt&#039;, $options);
        $this-&gt;keywordsBefore = file($dataDir.&#039;keywords_before.txt&#039;, $options);
        $this-&gt;keywordsAfter = file($dataDir.&#039;keywords_after.txt&#039;, $options);
        $this-&gt;operators = file($dataDir.&#039;operators.txt&#039;, $options);
        $this-&gt;operatorsBefore = file($dataDir.&#039;operators_before.txt&#039;, $options);
        $this-&gt;operatorsAfter = file($dataDir.&#039;operators_after.txt&#039;, $options);
    }

    /**
     * Minify the data.
     * Perform JS optimizations.
     *
     * @param string[optional] $path Path to write the data to
     *
     * @return string The minified data
     */
    public function execute($path = null)
    {
        $content = &#039;&#039;;

        /*
         * Let&#039;s first take out strings, comments and regular expressions.
         * All of these can contain JS code-like characters, and we should make
         * sure any further magic ignores anything inside of these.
         *
         * Consider this example, where we should not strip any whitespace:
         * var str = &quot;a   test&quot;;
         *
         * Comments will be removed altogether, strings and regular expressions
         * will be replaced by placeholder text, which we&#039;ll restore later.
         */
        $this-&gt;extractStrings(&#039;\&#039;&quot;`&#039;);
        $this-&gt;stripComments();
        $this-&gt;extractRegex();

        // loop files
        foreach ($this-&gt;data as $source =&gt; $js) {
            // take out strings, comments &amp; regex (for which we&#039;ve registered
            // the regexes just a few lines earlier)
            $js = $this-&gt;replace($js);

            $js = $this-&gt;propertyNotation($js);
            $js = $this-&gt;shortenBools($js);
            $js = $this-&gt;stripWhitespace($js);

            // combine js: separating the scripts by a ;
            $content .= $js.&quot;;&quot;;
        }

        // clean up leftover `;`s from the combination of multiple scripts
        $content = ltrim($content, &#039;;&#039;);
        $content = (string) substr($content, 0, -1);

        /*
         * Earlier, we extracted strings &amp; regular expressions and replaced them
         * with placeholder text. This will restore them.
         */
        $content = $this-&gt;restoreExtractedData($content);

        return $content;
    }

    /**
     * Strip comments from source code.
     */
    protected function stripComments()
    {
        // PHP only supports $this inside anonymous functions since 5.4
        $minifier = $this;
        $callback = function ($match) use ($minifier) {
            $count = count($minifier-&gt;extracted);
            $placeholder = &#039;/*&#039;.$count.&#039;*/&#039;;
            $minifier-&gt;extracted[$placeholder] = $match[0];

            return $placeholder;
        };
        // multi-line comments
        $this-&gt;registerPattern(&#039;/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s&#039;, $callback);
        $this-&gt;registerPattern(&#039;/\/\*.*?\*\//s&#039;, &#039;&#039;);

        // single-line comments
        $this-&gt;registerPattern(&#039;/\/\/.*$/m&#039;, &#039;&#039;);
    }

    /**
     * JS can have /-delimited regular expressions, like: /ab+c/.match(string).
     *
     * The content inside the regex can contain characters that may be confused
     * for JS code: e.g. it could contain whitespace it needs to match &amp; we
     * don&#039;t want to strip whitespace in there.
     *
     * The regex can be pretty simple: we don&#039;t have to care about comments,
     * (which also use slashes) because stripComments() will have stripped those
     * already.
     *
     * This method will replace all string content with simple REGEX#
     * placeholder text, so we&#039;ve rid all regular expressions from characters
     * that may be misinterpreted. Original regex content will be saved in
     * $this-&gt;extracted and after doing all other minifying, we can restore the
     * original content via restoreRegex()
     */
    protected function extractRegex()
    {
        // PHP only supports $this inside anonymous functions since 5.4
        $minifier = $this;
        $callback = function ($match) use ($minifier) {
            $count = count($minifier-&gt;extracted);
            $placeholder = &#039;&quot;&#039;.$count.&#039;&quot;&#039;;
            $minifier-&gt;extracted[$placeholder] = $match[0];

            return $placeholder;
        };

        // match all chars except `/` and `\`
        // `\` is allowed though, along with whatever char follows (which is the
        // one being escaped)
        // this should allow all chars, except for an unescaped `/` (= the one
        // closing the regex)
        // then also ignore bare `/` inside `[]`, where they don&#039;t need to be
        // escaped: anything inside `[]` can be ignored safely
        $pattern = &#039;\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*&#039;;

        // a regular expression can only be followed by a few operators or some
        // of the RegExp methods (a `\` followed by a variable or value is
        // likely part of a division, not a regex)
        $keywords = array(&#039;do&#039;, &#039;in&#039;, &#039;new&#039;, &#039;else&#039;, &#039;throw&#039;, &#039;yield&#039;, &#039;delete&#039;, &#039;return&#039;,  &#039;typeof&#039;);
        $before = &#039;([=:,;\+\-\*\/\}\(\{\[&amp;\|!]|^|&#039;.implode(&#039;|&#039;, $keywords).&#039;)\s*&#039;;
        $propertiesAndMethods = array(
            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2
            &#039;constructor&#039;,
            &#039;flags&#039;,
            &#039;global&#039;,
            &#039;ignoreCase&#039;,
            &#039;multiline&#039;,
            &#039;source&#039;,
            &#039;sticky&#039;,
            &#039;unicode&#039;,
            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
            &#039;compile(&#039;,
            &#039;exec(&#039;,
            &#039;test(&#039;,
            &#039;toSource(&#039;,
            &#039;toString(&#039;,
        );
        $delimiters = array_fill(0, count($propertiesAndMethods), &#039;/&#039;);
        $propertiesAndMethods = array_map(&#039;preg_quote&#039;, $propertiesAndMethods, $delimiters);
        $after = &#039;(?=\s*([\.,;\)\}&amp;\|+]|\/\/|$|\.(&#039;.implode(&#039;|&#039;, $propertiesAndMethods).&#039;)))&#039;;
        $this-&gt;registerPattern(&#039;/&#039;.$before.&#039;\K&#039;.$pattern.$after.&#039;/&#039;, $callback);

        // regular expressions following a `)` are rather annoying to detect...
        // quite often, `/` after `)` is a division operator &amp; if it happens to
        // be followed by another one (or a comment), it is likely to be
        // confused for a regular expression
        // however, it&#039;s perfectly possible for a regex to follow a `)`: after
        // a single-line `if()`, `while()`, ... statement, for example
        // since, when they occur like that, they&#039;re always the start of a
        // statement, there&#039;s only a limited amount of ways they can be useful:
        // by calling the regex methods directly
        // if a regex following `)` is not followed by `.&lt;property or method&gt;`,
        // it&#039;s quite likely not a regex
        $before = &#039;\)\s*&#039;;
        $after = &#039;(?=\s*\.(&#039;.implode(&#039;|&#039;, $propertiesAndMethods).&#039;))&#039;;
        $this-&gt;registerPattern(&#039;/&#039;.$before.&#039;\K&#039;.$pattern.$after.&#039;/&#039;, $callback);

        // 1 more edge case: a regex can be followed by a lot more operators or
        // keywords if there&#039;s a newline (ASI) in between, where the operator
        // actually starts a new statement
        // (https://github.com/matthiasmullie/minify/issues/56)
        $operators = $this-&gt;getOperatorsForRegex($this-&gt;operatorsBefore, &#039;/&#039;);
        $operators += $this-&gt;getOperatorsForRegex($this-&gt;keywordsReserved, &#039;/&#039;);
        $after = &#039;(?=\s*\n\s*(&#039;.implode(&#039;|&#039;, $operators).&#039;))&#039;;
        $this-&gt;registerPattern(&#039;/&#039;.$pattern.$after.&#039;/&#039;, $callback);
    }

    /**
     * Strip whitespace.
     *
     * We won&#039;t strip *all* whitespace, but as much as possible. The thing that
     * we&#039;ll preserve are newlines we&#039;re unsure about.
     * JavaScript doesn&#039;t require statements to be terminated with a semicolon.
     * It will automatically fix missing semicolons with ASI (automatic semi-
     * colon insertion) at the end of line causing errors (without semicolon.)
     *
     * Because it&#039;s sometimes hard to tell if a newline is part of a statement
     * that should be terminated or not, we&#039;ll just leave some of them alone.
     *
     * @param string $content The content to strip the whitespace for
     *
     * @return string
     */
    protected function stripWhitespace($content)
    {
        // uniform line endings, make them all line feed
        $content = str_replace(array(&quot;\r\n&quot;, &quot;\r&quot;), &quot;\n&quot;, $content);

        // collapse all non-line feed whitespace into a single space
        $content = preg_replace(&#039;/[^\S\n]+/&#039;, &#039; &#039;, $content);

        // strip leading &amp; trailing whitespace
        $content = str_replace(array(&quot; \n&quot;, &quot;\n &quot;), &quot;\n&quot;, $content);

        // collapse consecutive line feeds into just 1
        $content = preg_replace(&#039;/\n+/&#039;, &quot;\n&quot;, $content);

        $operatorsBefore = $this-&gt;getOperatorsForRegex($this-&gt;operatorsBefore, &#039;/&#039;);
        $operatorsAfter = $this-&gt;getOperatorsForRegex($this-&gt;operatorsAfter, &#039;/&#039;);
        $operators = $this-&gt;getOperatorsForRegex($this-&gt;operators, &#039;/&#039;);
        $keywordsBefore = $this-&gt;getKeywordsForRegex($this-&gt;keywordsBefore, &#039;/&#039;);
        $keywordsAfter = $this-&gt;getKeywordsForRegex($this-&gt;keywordsAfter, &#039;/&#039;);

        // strip whitespace that ends in (or next line begin with) an operator
        // that allows statements to be broken up over multiple lines
        unset($operatorsBefore[&#039;+&#039;], $operatorsBefore[&#039;-&#039;], $operatorsAfter[&#039;+&#039;], $operatorsAfter[&#039;-&#039;]);
        $content = preg_replace(
            array(
                &#039;/(&#039;.implode(&#039;|&#039;, $operatorsBefore).&#039;)\s+/&#039;,
                &#039;/\s+(&#039;.implode(&#039;|&#039;, $operatorsAfter).&#039;)/&#039;,
            ),
            &#039;\\1&#039;,
            $content
        );

        // make sure + and - can&#039;t be mistaken for, or joined into ++ and --
        $content = preg_replace(
            array(
                &#039;/(?&lt;![\+\-])\s*([\+\-])(?![\+\-])/&#039;,
                &#039;/(?&lt;![\+\-])([\+\-])\s*(?![\+\-])/&#039;,
            ),
            &#039;\\1&#039;,
            $content
        );

        // collapse whitespace around reserved words into single space
        $content = preg_replace(&#039;/(^|[;\}\s])\K(&#039;.implode(&#039;|&#039;, $keywordsBefore).&#039;)\s+/&#039;, &#039;\\2 &#039;, $content);
        $content = preg_replace(&#039;/\s+(&#039;.implode(&#039;|&#039;, $keywordsAfter).&#039;)(?=([;\{\s]|$))/&#039;, &#039; \\1&#039;, $content);

        /*
         * We didn&#039;t strip whitespace after a couple of operators because they
         * could be used in different contexts and we can&#039;t be sure it&#039;s ok to
         * strip the newlines. However, we can safely strip any non-line feed
         * whitespace that follows them.
         */
        $operatorsDiffBefore = array_diff($operators, $operatorsBefore);
        $operatorsDiffAfter = array_diff($operators, $operatorsAfter);
        $content = preg_replace(&#039;/(&#039;.implode(&#039;|&#039;, $operatorsDiffBefore).&#039;)[^\S\n]+/&#039;, &#039;\\1&#039;, $content);
        $content = preg_replace(&#039;/[^\S\n]+(&#039;.implode(&#039;|&#039;, $operatorsDiffAfter).&#039;)/&#039;, &#039;\\1&#039;, $content);

        /*
         * Whitespace after `return` can be omitted in a few occasions
         * (such as when followed by a string or regex)
         * Same for whitespace in between `)` and `{`, or between `{` and some
         * keywords.
         */
        $content = preg_replace(&#039;/\breturn\s+([&quot;\&#039;\/\+\-])/&#039;, &#039;return$1&#039;, $content);
        $content = preg_replace(&#039;/\)\s+\{/&#039;, &#039;){&#039;, $content);
        $content = preg_replace(&#039;/}\n(else|catch|finally)\b/&#039;, &#039;}$1&#039;, $content);

        /*
         * Get rid of double semicolons, except where they can be used like:
         * &quot;for(v=1,_=b;;)&quot;, &quot;for(v=1;;v++)&quot; or &quot;for(;;ja||(ja=true))&quot;.
         * I&#039;ll safeguard these double semicolons inside for-loops by
         * temporarily replacing them with an invalid condition: they won&#039;t have
         * a double semicolon and will be easy to spot to restore afterwards.
         */
        $content = preg_replace(&#039;/\bfor\(([^;]*);;([^;]*)\)/&#039;, &#039;for(\\1;-;\\2)&#039;, $content);
        $content = preg_replace(&#039;/;+/&#039;, &#039;;&#039;, $content);
        $content = preg_replace(&#039;/\bfor\(([^;]*);-;([^;]*)\)/&#039;, &#039;for(\\1;;\\2)&#039;, $content);

        /*
         * Next, we&#039;ll be removing all semicolons where ASI kicks in.
         * for-loops however, can have an empty body (ending in only a
         * semicolon), like: `for(i=1;i&lt;3;i++);`, of `for(i in list);`
         * Here, nothing happens during the loop; it&#039;s just used to keep
         * increasing `i`. With that ; omitted, the next line would be expected
         * to be the for-loop&#039;s body... Same goes for while loops.
         * I&#039;m going to double that semicolon (if any) so after the next line,
         * which strips semicolons here &amp; there, we&#039;re still left with this one.
         */
        $content = preg_replace(&#039;/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s&#039;, &#039;\\1;;\\2&#039;, $content);
        $content = preg_replace(&#039;/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s&#039;, &#039;\\1;;\\2&#039;, $content);
        /*
         * Below will also keep `;` after a `do{}while();` along with `while();`
         * While these could be stripped after do-while, detecting this
         * distinction is cumbersome, so I&#039;ll play it safe and make sure `;`
         * after any kind of `while` is kept.
         */
        $content = preg_replace(&#039;/(while\([^;\{]+\));(\}|$)/s&#039;, &#039;\\1;;\\2&#039;, $content);

        /*
         * We also can&#039;t strip empty else-statements. Even though they&#039;re
         * useless and probably shouldn&#039;t be in the code in the first place, we
         * shouldn&#039;t be stripping the `;` that follows it as it breaks the code.
         * We can just remove those useless else-statements completely.
         *
         * @see https://github.com/matthiasmullie/minify/issues/91
         */
        $content = preg_replace(&#039;/else;/s&#039;, &#039;&#039;, $content);

        /*
         * We also don&#039;t really want to terminate statements followed by closing
         * curly braces (which we&#039;ve ignored completely up until now) or end-of-
         * script: ASI will kick in here &amp; we&#039;re all about minifying.
         * Semicolons at beginning of the file don&#039;t make any sense either.
         */
        $content = preg_replace(&#039;/;(\}|$)/s&#039;, &#039;\\1&#039;, $content);
        $content = ltrim($content, &#039;;&#039;);

        // get rid of remaining whitespace af beginning/end
        return trim($content);
    }

    /**
     * We&#039;ll strip whitespace around certain operators with regular expressions.
     * This will prepare the given array by escaping all characters.
     *
     * @param string[] $operators
     * @param string   $delimiter
     *
     * @return string[]
     */
    protected function getOperatorsForRegex(array $operators, $delimiter = &#039;/&#039;)
    {
        // escape operators for use in regex
        $delimiters = array_fill(0, count($operators), $delimiter);
        $escaped = array_map(&#039;preg_quote&#039;, $operators, $delimiters);

        $operators = array_combine($operators, $escaped);

        // ignore + &amp; - for now, they&#039;ll get special treatment
        unset($operators[&#039;+&#039;], $operators[&#039;-&#039;]);

        // dot can not just immediately follow a number; it can be confused for
        // decimal point, or calling a method on it, e.g. 42 .toString()
        $operators[&#039;.&#039;] = &#039;(?&lt;![0-9]\s)\.&#039;;

        // don&#039;t confuse = with other assignment shortcuts (e.g. +=)
        $chars = preg_quote(&#039;+-*\=&lt;&gt;%&amp;|&#039;, $delimiter);
        $operators[&#039;=&#039;] = &#039;(?&lt;![&#039;.$chars.&#039;])\=&#039;;

        return $operators;
    }

    /**
     * We&#039;ll strip whitespace around certain keywords with regular expressions.
     * This will prepare the given array by escaping all characters.
     *
     * @param string[] $keywords
     * @param string   $delimiter
     *
     * @return string[]
     */
    protected function getKeywordsForRegex(array $keywords, $delimiter = &#039;/&#039;)
    {
        // escape keywords for use in regex
        $delimiter = array_fill(0, count($keywords), $delimiter);
        $escaped = array_map(&#039;preg_quote&#039;, $keywords, $delimiter);

        // add word boundaries
        array_walk($keywords, function ($value) {
            return &#039;\b&#039;.$value.&#039;\b&#039;;
        });

        $keywords = array_combine($keywords, $escaped);

        return $keywords;
    }

    /**
     * Replaces all occurrences of array[&#039;key&#039;] by array.key.
     *
     * @param string $content
     *
     * @return string
     */
    protected function propertyNotation($content)
    {
        // PHP only supports $this inside anonymous functions since 5.4
        $minifier = $this;
        $keywords = $this-&gt;keywordsReserved;
        $callback = function ($match) use ($minifier, $keywords) {
            $property = trim($minifier-&gt;extracted[$match[1]], &#039;\&#039;&quot;&#039;);

            /*
             * Check if the property is a reserved keyword. In this context (as
             * property of an object literal/array) it shouldn&#039;t matter, but IE8
             * freaks out with &quot;Expected identifier&quot;.
             */
            if (in_array($property, $keywords)) {
                return $match[0];
            }

            /*
             * See if the property is in a variable-like format (e.g.
             * array[&#039;key-here&#039;] can&#039;t be replaced by array.key-here since &#039;-&#039;
             * is not a valid character there.
             */
            if (!preg_match(&#039;/^&#039;.$minifier::REGEX_VARIABLE.&#039;$/u&#039;, $property)) {
                return $match[0];
            }

            return &#039;.&#039;.$property;
        };

        /*
         * Figure out if previous character is a variable name (of the array
         * we want to use property notation on) - this is to make sure
         * standalone [&#039;value&#039;] arrays aren&#039;t confused for keys-of-an-array.
         * We can (and only have to) check the last character, because PHP&#039;s
         * regex implementation doesn&#039;t allow unfixed-length look-behind
         * assertions.
         */
        preg_match(&#039;/(\[[^\]]+\])[^\]]*$/&#039;, static::REGEX_VARIABLE, $previousChar);
        $previousChar = $previousChar[1];

        /*
         * Make sure word preceding the [&#039;value&#039;] is not a keyword, e.g.
         * return[&#039;x&#039;]. Because -again- PHP&#039;s regex implementation doesn&#039;t allow
         * unfixed-length look-behind assertions, I&#039;m just going to do a lot of
         * separate look-behind assertions, one for each keyword.
         */
        $keywords = $this-&gt;getKeywordsForRegex($keywords);
        $keywords = &#039;(?&lt;!&#039;.implode(&#039;)(?&lt;!&#039;, $keywords).&#039;)&#039;;

        return preg_replace_callback(&#039;/(?&lt;=&#039;.$previousChar.&#039;|\])&#039;.$keywords.&#039;\[\s*(([\&#039;&quot;])[0-9]+\\2)\s*\]/u&#039;, $callback, $content);
    }

    /**
     * Replaces true &amp; false by !0 and !1.
     *
     * @param string $content
     *
     * @return string
     */
    protected function shortenBools($content)
    {
        /*
         * &#039;true&#039; or &#039;false&#039; could be used as property names (which may be
         * followed by whitespace) - we must not replace those!
         * Since PHP doesn&#039;t allow variable-length (to account for the
         * whitespace) lookbehind assertions, I need to capture the leading
         * character and check if it&#039;s a `.`
         */
        $callback = function ($match) {
            if (trim($match[1]) === &#039;.&#039;) {
                return $match[0];
            }

            return $match[1].($match[2] === &#039;true&#039; ? &#039;!0&#039; : &#039;!1&#039;);
        };
        $content = preg_replace_callback(&#039;/(^|.\s*)\b(true|false)\b(?!:)/&#039;, $callback, $content);

        // for(;;) is exactly the same as while(true), but shorter :)
        $content = preg_replace(&#039;/\bwhile\(!0\){/&#039;, &#039;for(;;){&#039;, $content);

        // now make sure we didn&#039;t turn any do ... while(true) into do ... for(;;)
        preg_match_all(&#039;/\bdo\b/&#039;, $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);

        // go backward to make sure positional offsets aren&#039;t altered when $content changes
        $dos = array_reverse($dos);
        foreach ($dos as $do) {
            $offsetDo = $do[0][1];

            // find all `while` (now `for`) following `do`: one of those must be
            // associated with the `do` and be turned back into `while`
            preg_match_all(&#039;/\bfor\(;;\)/&#039;, $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo);
            foreach ($whiles as $while) {
                $offsetWhile = $while[0][1];

                $open = substr_count($content, &#039;{&#039;, $offsetDo, $offsetWhile - $offsetDo);
                $close = substr_count($content, &#039;}&#039;, $offsetDo, $offsetWhile - $offsetDo);
                if ($open === $close) {
                    // only restore `while` if amount of `{` and `}` are the same;
                    // otherwise, that `for` isn&#039;t associated with this `do`
                    $content = substr_replace($content, &#039;while(!0)&#039;, $offsetWhile, strlen(&#039;for(;;)&#039;));
                    break;
                }
            }
        }

        return $content;
    }
}
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