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/**
 * JSMin.php - modified PHP implementation of Douglas Crockford's JSMin.
 *
 * &lt;code&gt;
 * $minifiedJs = JSMin::minify($js);
 * &lt;/code&gt;
 *
 * This is a modified port of jsmin.c. Improvements:
 *
 * Does not choke on some regexp literals containing quote characters. E.g. /'/
 *
 * Spaces are preserved after some add/sub operators, so they are not mistakenly
 * converted to post-inc/dec. E.g. a + ++b -&gt; a+ ++b
 *
 * Preserves multi-line comments that begin with /*!
 *
 * PHP 5 or higher is required.
 *
 * Permission is hereby granted to use this version of the library under the
 * same terms as jsmin.c, which has the following license:
 *
 * --
 * Copyright (c) 2002 Douglas Crockford  (www.crockford.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the &quot;Software&quot;), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * The Software shall be used for Good, not Evil.
 *
 * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * --
 *
 * @package JSMin
 * @author Ryan Grove &lt;ryan@wonko.com&gt; (PHP port)
 * @author Steve Clay &lt;steve@mrclay.org&gt; (modifications + cleanup)
 * @author Andrea Giammarchi &lt;http://www.3site.eu&gt; (spaceBeforeRegExp)
 * @copyright 2002 Douglas Crockford &lt;douglas@crockford.com&gt; (jsmin.c)
 * @copyright 2008 Ryan Grove &lt;ryan@wonko.com&gt; (PHP port)
 * @license http://opensource.org/licenses/mit-license.php MIT License
 * @link http://code.google.com/p/jsmin-php/
 */

// This is from https://github.com/mrclay/jsmin-php 2.3.2

class JSMin {
    const ORD_LF            = 10;
    const ORD_SPACE         = 32;
    const ACTION_KEEP_A     = 1;
    const ACTION_DELETE_A   = 2;
    const ACTION_DELETE_A_B = 3;

    protected $a           = &quot;\n&quot;;
    protected $b           = '';
    protected $input       = '';
    protected $inputIndex  = 0;
    protected $inputLength = 0;
    protected $lookAhead   = null;
    protected $output      = '';
    protected $lastByteOut  = '';
    protected $keptComment = '';

    /**
     * Minify Javascript.
     *
     * @param string $js Javascript to be minified
     *
     * @return string
     */
    public static function minify($js)
    {
        $jsmin = new JSMin($js);
        return $jsmin-&gt;min();
    }

    /**
     * @param string $input
     */
    public function __construct($input)
    {
        $this-&gt;input = $input;
    }

    /**
     * Perform minification, return result
     *
     * @return string
     */
    public function min()
    {
        if ($this-&gt;output !== '') { // min already run
            return $this-&gt;output;
        }

        $mbIntEnc = null;
        if (function_exists('mb_strlen') &amp;&amp; ((int)ini_get('mbstring.func_overload') &amp; 2)) {
            $mbIntEnc = mb_internal_encoding();
            mb_internal_encoding('8bit');
        }

        if (isset($this-&gt;input[0]) &amp;&amp; $this-&gt;input[0] === &quot;\xef&quot;) {
            $this-&gt;input = substr($this-&gt;input, 3);
        }

        $this-&gt;input = str_replace(&quot;\r\n&quot;, &quot;\n&quot;, $this-&gt;input);
        $this-&gt;inputLength = strlen($this-&gt;input);

        $this-&gt;action(self::ACTION_DELETE_A_B);

        while ($this-&gt;a !== null) {
            // determine next command
            $command = self::ACTION_KEEP_A; // default
            if ($this-&gt;a === ' ') {
                if (($this-&gt;lastByteOut === '+' || $this-&gt;lastByteOut === '-')
                        &amp;&amp; ($this-&gt;b === $this-&gt;lastByteOut)) {
                    // Don't delete this space. If we do, the addition/subtraction
                    // could be parsed as a post-increment
                } elseif (! $this-&gt;isAlphaNum($this-&gt;b)) {
                    $command = self::ACTION_DELETE_A;
                }
            } elseif ($this-&gt;a === &quot;\n&quot;) {
                if ($this-&gt;b === ' ') {
                    $command = self::ACTION_DELETE_A_B;

                    // in case of mbstring.func_overload &amp; 2, must check for null b,
                    // otherwise mb_strpos will give WARNING
                } elseif ($this-&gt;b === null
                          || (false === strpos('{[(+-!~#', $this-&gt;b)
                              &amp;&amp; ! $this-&gt;isAlphaNum($this-&gt;b))) {
                    $command = self::ACTION_DELETE_A;
                }
            } elseif (! $this-&gt;isAlphaNum($this-&gt;a)) {
                if ($this-&gt;b === ' '
                    || ($this-&gt;b === &quot;\n&quot;
                        &amp;&amp; (false === strpos('}])+-&quot;\'`', $this-&gt;a)))) {
                    $command = self::ACTION_DELETE_A_B;
                }
            }
            $this-&gt;action($command);
        }
        $this-&gt;output = trim($this-&gt;output);

        if ($mbIntEnc !== null) {
            mb_internal_encoding($mbIntEnc);
        }
        return $this-&gt;output;
    }

    /**
     * ACTION_KEEP_A = Output A. Copy B to A. Get the next B.
     * ACTION_DELETE_A = Copy B to A. Get the next B.
     * ACTION_DELETE_A_B = Get the next B.
     *
     * @param int $command
     * @throws JSMin_UnterminatedRegExpException|JSMin_UnterminatedStringException
     */
    protected function action($command)
    {
        // make sure we don't compress &quot;a + ++b&quot; to &quot;a+++b&quot;, etc.
        if ($command === self::ACTION_DELETE_A_B
            &amp;&amp; $this-&gt;b === ' '
            &amp;&amp; ($this-&gt;a === '+' || $this-&gt;a === '-')) {
            // Note: we're at an addition/substraction operator; the inputIndex
            // will certainly be a valid index
            if ($this-&gt;input[$this-&gt;inputIndex] === $this-&gt;a) {
                // This is &quot;+ +&quot; or &quot;- -&quot;. Don't delete the space.
                $command = self::ACTION_KEEP_A;
            }
        }

        switch ($command) {
            case self::ACTION_KEEP_A: // 1
                $this-&gt;output .= $this-&gt;a;

                if ($this-&gt;keptComment) {
                    $this-&gt;output = rtrim($this-&gt;output, &quot;\n&quot;);
                    $this-&gt;output .= $this-&gt;keptComment;
                    $this-&gt;keptComment = '';
                }

                $this-&gt;lastByteOut = $this-&gt;a;

                // fallthrough intentional
            case self::ACTION_DELETE_A: // 2
                $this-&gt;a = $this-&gt;b;
                if ($this-&gt;a === &quot;'&quot; || $this-&gt;a === '&quot;' || $this-&gt;a === '`') { // string/template literal
                    $delimiter = $this-&gt;a;
                    $str = $this-&gt;a; // in case needed for exception
                    for(;;) {
                        $this-&gt;output .= $this-&gt;a;
                        $this-&gt;lastByteOut = $this-&gt;a;

                        $this-&gt;a = $this-&gt;get();
                        if ($this-&gt;a === $this-&gt;b) { // end quote
                            break;
                        }
                        if ($delimiter === '`' &amp;&amp; $this-&gt;a === &quot;\n&quot;) {
                            // leave the newline
                        } elseif ($this-&gt;isEOF($this-&gt;a)) {
                            $byte = $this-&gt;inputIndex - 1;
                            throw new JSMin_UnterminatedStringException(
                                &quot;JSMin: Unterminated String at byte {$byte}: {$str}&quot;);
                        }
                        $str .= $this-&gt;a;
                        if ($this-&gt;a === '\\') {
                            $this-&gt;output .= $this-&gt;a;
                            $this-&gt;lastByteOut = $this-&gt;a;

                            $this-&gt;a = $this-&gt;get();
                            $str .= $this-&gt;a;
                        }
                    }
                }

                // fallthrough intentional
            case self::ACTION_DELETE_A_B: // 3
                $this-&gt;b = $this-&gt;next();
                if ($this-&gt;b === '/' &amp;&amp; $this-&gt;isRegexpLiteral()) {
                    $this-&gt;output .= $this-&gt;a . $this-&gt;b;
                    $pattern = '/'; // keep entire pattern in case we need to report it in the exception
                    for(;;) {
                        $this-&gt;a = $this-&gt;get();
                        $pattern .= $this-&gt;a;
                        if ($this-&gt;a === '[') {
                            for(;;) {
                                $this-&gt;output .= $this-&gt;a;
                                $this-&gt;a = $this-&gt;get();
                                $pattern .= $this-&gt;a;
                                if ($this-&gt;a === ']') {
                                    break;
                                }
                                if ($this-&gt;a === '\\') {
                                    $this-&gt;output .= $this-&gt;a;
                                    $this-&gt;a = $this-&gt;get();
                                    $pattern .= $this-&gt;a;
                                }
                                if ($this-&gt;isEOF($this-&gt;a)) {
                                    throw new JSMin_UnterminatedRegExpException(
                                        &quot;JSMin: Unterminated set in RegExp at byte &quot;
                                            . $this-&gt;inputIndex .&quot;: {$pattern}&quot;);
                                }
                            }
                        }

                        if ($this-&gt;a === '/') { // end pattern
                            break; // while (true)
                        } elseif ($this-&gt;a === '\\') {
                            $this-&gt;output .= $this-&gt;a;
                            $this-&gt;a = $this-&gt;get();
                            $pattern .= $this-&gt;a;
                        } elseif ($this-&gt;isEOF($this-&gt;a)) {
                            $byte = $this-&gt;inputIndex - 1;
                            throw new JSMin_UnterminatedRegExpException(
                                &quot;JSMin: Unterminated RegExp at byte {$byte}: {$pattern}&quot;);
                        }
                        $this-&gt;output .= $this-&gt;a;
                        $this-&gt;lastByteOut = $this-&gt;a;
                    }
                    $this-&gt;b = $this-&gt;next();
                }
            // end case ACTION_DELETE_A_B
        }
    }

    /**
     * @return bool
     */
    protected function isRegexpLiteral()
    {
        if (false !== strpos(&quot;(,=:[!&amp;|?+-~*{;&quot;, $this-&gt;a)) {
            // we can't divide after these tokens
            return true;
        }

        // check if first non-ws token is &quot;/&quot; (see starts-regex.js)
        $length = strlen($this-&gt;output);
        if ($this-&gt;a === ' ' || $this-&gt;a === &quot;\n&quot;) {
            if ($length &lt; 2) { // weird edge case
                return true;
            }
        }

        // if the &quot;/&quot; follows a keyword, it must be a regexp, otherwise it's best to assume division

        $subject = $this-&gt;output . trim($this-&gt;a);
        if (!preg_match('/(?:case|else|in|return|typeof)$/', $subject, $m)) {
            // not a keyword
            return false;
        }

        // can't be sure it's a keyword yet (see not-regexp.js)
        $charBeforeKeyword = substr($subject, 0 - strlen($m[0]) - 1, 1);
        if ($this-&gt;isAlphaNum($charBeforeKeyword)) {
            // this is really an identifier ending in a keyword, e.g. &quot;xreturn&quot;
            return false;
        }

        // it's a regexp. Remove unneeded whitespace after keyword
        if ($this-&gt;a === ' ' || $this-&gt;a === &quot;\n&quot;) {
            $this-&gt;a = '';
        }

        return true;
    }

    /**
     * Return the next character from stdin. Watch out for lookahead. If the character is a control character,
     * translate it to a space or linefeed.
     *
     * @return string
     */
    protected function get()
    {
        $c = $this-&gt;lookAhead;
        $this-&gt;lookAhead = null;
        if ($c === null) {
            // getc(stdin)
            if ($this-&gt;inputIndex &lt; $this-&gt;inputLength) {
                $c = $this-&gt;input[$this-&gt;inputIndex];
                $this-&gt;inputIndex += 1;
            } else {
                return $c;
            }
        }
        if (ord($c) &gt;= self::ORD_SPACE || $c === &quot;\n&quot; || $c === null) {
            return $c;
        }
        if ($c === &quot;\r&quot;) {
            return &quot;\n&quot;;
        }
        return ' ';
    }

    /**
     * Does $a indicate end of input?
     *
     * @param string $a
     * @return bool
     */
    protected function isEOF($a)
    {
        return ord($a) &lt;= self::ORD_LF;
    }

    /**
     * Get next char (without getting it). If is ctrl character, translate to a space or newline.
     *
     * @return string
     */
    protected function peek()
    {
        $this-&gt;lookAhead = $this-&gt;get();
        return $this-&gt;lookAhead;
    }

    /**
     * Return true if the character is a letter, digit, underscore, dollar sign, or non-ASCII character.
     *
     * @param string $c
     *
     * @return bool
     */
    protected function isAlphaNum($c)
    {
        return (preg_match('/^[a-z0-9A-Z_\\$\\\\]$/', $c) || ord($c) &gt; 126);
    }

    /**
     * Consume a single line comment from input (possibly retaining it)
     */
    protected function consumeSingleLineComment()
    {
        $comment = '';
        while (true) {
            $get = $this-&gt;get();
            $comment .= $get;
            if (ord($get) &lt;= self::ORD_LF) { // end of line reached
                // if IE conditional comment
                if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
                    $this-&gt;keptComment .= &quot;/{$comment}&quot;;
                }
                return;
            }
        }
    }

    /**
     * Consume a multiple line comment from input (possibly retaining it)
     *
     * @throws JSMin_UnterminatedCommentException
     */
    protected function consumeMultipleLineComment()
    {
        $this-&gt;get();
        $comment = '';
        for(;;) {
            $get = $this-&gt;get();
            if ($get === '*') {
                if ($this-&gt;peek() === '/') { // end of comment reached
                    $this-&gt;get();
                    if (0 === strpos($comment, '!')) {
                        // preserved by YUI Compressor
                        if (!$this-&gt;keptComment) {
                            // don't prepend a newline if two comments right after one another
                            $this-&gt;keptComment = &quot;\n&quot;;
                        }
                        $this-&gt;keptComment .= &quot;/*!&quot; . substr($comment, 1) . &quot;*/\n&quot;;
                    } else if (preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
                        // IE conditional
                        $this-&gt;keptComment .= &quot;/*{$comment}*/&quot;;
                    }
                    return;
                }
            } elseif ($get === null) {
                throw new JSMin_UnterminatedCommentException(
                    &quot;JSMin: Unterminated comment at byte {$this-&gt;inputIndex}: /*{$comment}&quot;);
            }
            $comment .= $get;
        }
    }

    /**
     * Get the next character, skipping over comments. Some comments may be preserved.
     *
     * @return string
     */
    protected function next()
    {
        $get = $this-&gt;get();
        if ($get === '/') {
            switch ($this-&gt;peek()) {
                case '/':
                    $this-&gt;consumeSingleLineComment();
                    $get = &quot;\n&quot;;
                    break;
                case '*':
                    $this-&gt;consumeMultipleLineComment();
                    $get = ' ';
                    break;
            }
        }
        return $get;
    }
}

class JSMin_UnterminatedStringException extends Exception {}
class JSMin_UnterminatedCommentException extends Exception {}
class JSMin_UnterminatedRegExpException extends Exception {}
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