JSMin::min() - Code Metrics - Inspection of "this was 2.7.6" - futtta/autoptimize - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 5b581f...5da188 )

by frank

created 2020-08-23 10:23 UTC

JSMin::min() D

↳ Parent: JSMin

Complexity

Conditions	22
Paths	81

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	22
nc	81
nop	0
dl	0
loc	59
rs	4.1666
c	0
b	0
f	0

How to fix Long Method Complexity

<?php
/**
 * JSMin.php - modified PHP implementation of Douglas Crockford's JSMin.
 *
 * <code>
 * $minifiedJs = JSMin::minify($js);
 * </code>
 *
 * 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 -> 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 "Software"), 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 "AS IS", 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 <[email protected]> (PHP port)
 * @author Steve Clay <[email protected]> (modifications + cleanup)
 * @author Andrea Giammarchi <http://www.3site.eu> (spaceBeforeRegExp)
 * @copyright 2002 Douglas Crockford <[email protected]> (jsmin.c)
 * @copyright 2008 Ryan Grove <[email protected]> (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           = "\n";
    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->min();
    }

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

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

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

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

        $this->input = str_replace("\r\n", "\n", $this->input);
        $this->inputLength = strlen($this->input);

        $this->action(self::ACTION_DELETE_A_B);

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

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

        if ($mbIntEnc !== null) {
            mb_internal_encoding($mbIntEnc);
        }
        return $this->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 "a + ++b" to "a+++b", etc.
        if ($command === self::ACTION_DELETE_A_B
            && $this->b === ' '
            && ($this->a === '+' || $this->a === '-')) {
            // Note: we're at an addition/substraction operator; the inputIndex
            // will certainly be a valid index
            if ($this->input[$this->inputIndex] === $this->a) {
                // This is "+ +" or "- -". Don't delete the space.
                $command = self::ACTION_KEEP_A;
            }
        }

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

                if ($this->keptComment) {
                    $this->output = rtrim($this->output, "\n");
                    $this->output .= $this->keptComment;
                    $this->keptComment = '';
                }

                $this->lastByteOut = $this->a;

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

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

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

                // fallthrough intentional
            case self::ACTION_DELETE_A_B: // 3
                $this->b = $this->next();
                if ($this->b === '/' && $this->isRegexpLiteral()) {
                    $this->output .= $this->a . $this->b;
                    $pattern = '/'; // keep entire pattern in case we need to report it in the exception
                    for(;;) {
                        $this->a = $this->get();
                        $pattern .= $this->a;
                        if ($this->a === '[') {
                            for(;;) {
                                $this->output .= $this->a;
                                $this->a = $this->get();
                                $pattern .= $this->a;
                                if ($this->a === ']') {
                                    break;
                                }
                                if ($this->a === '\\') {

                                    $this->output .= $this->a;
                                    $this->a = $this->get();
                                    $pattern .= $this->a;
                                }
                                if ($this->isEOF($this->a)) {
                                    throw new JSMin_UnterminatedRegExpException(
                                        "JSMin: Unterminated set in RegExp at byte "
                                            . $this->inputIndex .": {$pattern}");
                                }
                            }
                        }

                        if ($this->a === '/') { // end pattern
                            break; // while (true)
                        } elseif ($this->a === '\\') {

                            $this->output .= $this->a;
                            $this->a = $this->get();
                            $pattern .= $this->a;
                        } elseif ($this->isEOF($this->a)) {
                            $byte = $this->inputIndex - 1;
                            throw new JSMin_UnterminatedRegExpException(
                                "JSMin: Unterminated RegExp at byte {$byte}: {$pattern}");
                        }
                        $this->output .= $this->a;
                        $this->lastByteOut = $this->a;
                    }
                    $this->b = $this->next();
                }
            // end case ACTION_DELETE_A_B
        }
    }

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

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

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

        $subject = $this->output . trim($this->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->isAlphaNum($charBeforeKeyword)) {
            // this is really an identifier ending in a keyword, e.g. "xreturn"
            return false;
        }

        // it's a regexp. Remove unneeded whitespace after keyword
        if ($this->a === ' ' || $this->a === "\n") {
            $this->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->lookAhead;
        $this->lookAhead = null;
        if ($c === null) {
            // getc(stdin)
            if ($this->inputIndex < $this->inputLength) {
                $c = $this->input[$this->inputIndex];
                $this->inputIndex += 1;
            } else {
                $c = null;
            }
        }
        if (ord($c) >= self::ORD_SPACE || $c === "\n" || $c === null) {
            return $c;
        }
        if ($c === "\r") {
            return "\n";
        }
        return ' ';
    }

    /**
     * Does $a indicate end of input?
     *
     * @param string $a
     * @return bool
     */
    protected function isEOF($a)
    {
        return ord($a) <= 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->lookAhead = $this->get();
        return $this->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) > 126);
    }

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

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

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

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


1		<?php
2		/**
3		* JSMin.php - modified PHP implementation of Douglas Crockford's JSMin.
4		*
5		* <code>
6		* $minifiedJs = JSMin::minify($js);
7		* </code>
8		*
9		* This is a modified port of jsmin.c. Improvements:
10		*
11		* Does not choke on some regexp literals containing quote characters. E.g. /'/
12		*
13		* Spaces are preserved after some add/sub operators, so they are not mistakenly
14		* converted to post-inc/dec. E.g. a + ++b -> a+ ++b
15		*
16		* Preserves multi-line comments that begin with /*!
17		*
18		* PHP 5 or higher is required.
19		*
20		* Permission is hereby granted to use this version of the library under the
21		* same terms as jsmin.c, which has the following license:
22		*
23		* --
24		* Copyright (c) 2002 Douglas Crockford (www.crockford.com)
25		*
26		* Permission is hereby granted, free of charge, to any person obtaining a copy of
27		* this software and associated documentation files (the "Software"), to deal in
28		* the Software without restriction, including without limitation the rights to
29		* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
30		* of the Software, and to permit persons to whom the Software is furnished to do
31		* so, subject to the following conditions:
32		*
33		* The above copyright notice and this permission notice shall be included in all
34		* copies or substantial portions of the Software.
35		*
36		* The Software shall be used for Good, not Evil.
37		*
38		* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
39		* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
40		* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
41		* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
42		* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
43		* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
44		* SOFTWARE.
45		* --
46		*
47		* @package JSMin
48		* @author Ryan Grove <[email protected]> (PHP port)
49		* @author Steve Clay <[email protected]> (modifications + cleanup)
50		* @author Andrea Giammarchi <http://www.3site.eu> (spaceBeforeRegExp)
51		* @copyright 2002 Douglas Crockford <[email protected]> (jsmin.c)
52		* @copyright 2008 Ryan Grove <[email protected]> (PHP port)
53		* @license http://opensource.org/licenses/mit-license.php MIT License
54		* @link http://code.google.com/p/jsmin-php/
55		*/
56
57		// This is from https://github.com/mrclay/jsmin-php 2.3.2
58
59		class JSMin {
60		const ORD_LF = 10;
61		const ORD_SPACE = 32;
62		const ACTION_KEEP_A = 1;
63		const ACTION_DELETE_A = 2;
64		const ACTION_DELETE_A_B = 3;
65
66		protected $a = "\n";
67		protected $b = '';
68		protected $input = '';
69		protected $inputIndex = 0;
70		protected $inputLength = 0;
71		protected $lookAhead = null;
72		protected $output = '';
73		protected $lastByteOut = '';
74		protected $keptComment = '';
75
76		/**
77		* Minify Javascript.
78		*
79		* @param string $js Javascript to be minified
80		*
81		* @return string
82		*/
83		public static function minify($js)
84		{
85		$jsmin = new JSMin($js);
86		return $jsmin->min();
87		}
88
89		/**
90		* @param string $input
91		*/
92		public function __construct($input)
93		{
94		$this->input = $input;
95		}
96
97		/**
98		* Perform minification, return result
99		*
100		* @return string
101		*/
102		public function min()
103		{
104		if ($this->output !== '') { // min already run
105		return $this->output;
106		}
107
108		$mbIntEnc = null;
109		if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) {
110		$mbIntEnc = mb_internal_encoding();
111		mb_internal_encoding('8bit');
112		}
113
114		if (isset($this->input[0]) && $this->input[0] === "\xef") {
115		$this->input = substr($this->input, 3);
116		}
117
118		$this->input = str_replace("\r\n", "\n", $this->input);
119		$this->inputLength = strlen($this->input);
120
121		$this->action(self::ACTION_DELETE_A_B);
122
123		while ($this->a !== null) {
124		// determine next command
125		$command = self::ACTION_KEEP_A; // default
126		if ($this->a === ' ') {
127		if (($this->lastByteOut === '+' \|\| $this->lastByteOut === '-')
128		&& ($this->b === $this->lastByteOut)) {
129		// Don't delete this space. If we do, the addition/subtraction
130		// could be parsed as a post-increment
131		} elseif (! $this->isAlphaNum($this->b)) {
132		$command = self::ACTION_DELETE_A;
133		}
134		} elseif ($this->a === "\n") {
135		if ($this->b === ' ') {
136		$command = self::ACTION_DELETE_A_B;
137
138		// in case of mbstring.func_overload & 2, must check for null b,
139		// otherwise mb_strpos will give WARNING
140		} elseif ($this->b === null
141		\|\| (false === strpos('{[(+-!~', $this->b)
142		&& ! $this->isAlphaNum($this->b))) {
143		$command = self::ACTION_DELETE_A;
144		}
145		} elseif (! $this->isAlphaNum($this->a)) {
146		if ($this->b === ' '
147		\|\| ($this->b === "\n"
148		&& (false === strpos('}])+-"\'', $this->a)))) {
149		$command = self::ACTION_DELETE_A_B;
150		}
151		}
152		$this->action($command);
153		}
154		$this->output = trim($this->output);
155
156		if ($mbIntEnc !== null) {
157		mb_internal_encoding($mbIntEnc);
158		}
159		return $this->output;
160		}
161
162		/**
163		* ACTION_KEEP_A = Output A. Copy B to A. Get the next B.
164		* ACTION_DELETE_A = Copy B to A. Get the next B.
165		* ACTION_DELETE_A_B = Get the next B.
166		*
167		* @param int $command
168		* @throws JSMin_UnterminatedRegExpException\|JSMin_UnterminatedStringException
169		*/
170		protected function action($command)
171		{
172		// make sure we don't compress "a + ++b" to "a+++b", etc.
173		if ($command === self::ACTION_DELETE_A_B
174		&& $this->b === ' '
175		&& ($this->a === '+' \|\| $this->a === '-')) {
176		// Note: we're at an addition/substraction operator; the inputIndex
177		// will certainly be a valid index
178		if ($this->input[$this->inputIndex] === $this->a) {
179		// This is "+ +" or "- -". Don't delete the space.
180		$command = self::ACTION_KEEP_A;
181		}
182		}
183
184		switch ($command) {
185		case self::ACTION_KEEP_A: // 1
186		$this->output .= $this->a;
187
188		if ($this->keptComment) {
189		$this->output = rtrim($this->output, "\n");
190		$this->output .= $this->keptComment;
191		$this->keptComment = '';
192		}
193
194		$this->lastByteOut = $this->a;
195
196		// fallthrough intentional
197		case self::ACTION_DELETE_A: // 2
198		$this->a = $this->b;
199		if ($this->a === "'" \|\| $this->a === '"' \|\| $this->a === '`') { // string/template literal
200		$delimiter = $this->a;
201		$str = $this->a; // in case needed for exception
202		for(;;) {
203		$this->output .= $this->a;
204		$this->lastByteOut = $this->a;
205
206		$this->a = $this->get();
207		if ($this->a === $this->b) { // end quote
208		break;
209		}
210		if ($delimiter === '`' && $this->a === "\n") {
211		// leave the newline
212		} elseif ($this->isEOF($this->a)) {
213		$byte = $this->inputIndex - 1;
214		throw new JSMin_UnterminatedStringException(
215		"JSMin: Unterminated String at byte {$byte}: {$str}");
216		}
217		$str .= $this->a;
218		if ($this->a === '\\') {
219		$this->output .= $this->a;
220		$this->lastByteOut = $this->a;
221
222		$this->a = $this->get();
223		$str .= $this->a;
224		}
225		}
226		}
227
228		// fallthrough intentional
229		case self::ACTION_DELETE_A_B: // 3
230		$this->b = $this->next();
231		if ($this->b === '/' && $this->isRegexpLiteral()) {
232		$this->output .= $this->a . $this->b;
233		$pattern = '/'; // keep entire pattern in case we need to report it in the exception
234		for(;;) {
235		$this->a = $this->get();
236		$pattern .= $this->a;
237		if ($this->a === '[') {
238		for(;;) {
239		$this->output .= $this->a;
240		$this->a = $this->get();
241		$pattern .= $this->a;
242		if ($this->a === ']') {
243		break;
244		}
245	View Code Duplication	if ($this->a === '\\') {
		0 ignored issues – show Duplication introduced 2016-11-16 14:04 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
246		$this->output .= $this->a;
247		$this->a = $this->get();
248		$pattern .= $this->a;
249		}
250		if ($this->isEOF($this->a)) {
251		throw new JSMin_UnterminatedRegExpException(
252		"JSMin: Unterminated set in RegExp at byte "
253		. $this->inputIndex .": {$pattern}");
254		}
255		}
256		}
257
258		if ($this->a === '/') { // end pattern
259		break; // while (true)
260	View Code Duplication	} elseif ($this->a === '\\') {
		0 ignored issues – show Duplication introduced 2018-10-07 12:00 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
261		$this->output .= $this->a;
262		$this->a = $this->get();
263		$pattern .= $this->a;
264		} elseif ($this->isEOF($this->a)) {
265		$byte = $this->inputIndex - 1;
266		throw new JSMin_UnterminatedRegExpException(
267		"JSMin: Unterminated RegExp at byte {$byte}: {$pattern}");
268		}
269		$this->output .= $this->a;
270		$this->lastByteOut = $this->a;
271		}
272		$this->b = $this->next();
273		}
274		// end case ACTION_DELETE_A_B
275		}
276		}
277
278		/**
279		* @return bool
280		*/
281		protected function isRegexpLiteral()
282		{
283		if (false !== strpos("(,=:[!&\|?+-~*{;", $this->a)) {
284		// we can't divide after these tokens
285		return true;
286		}
287
288		// check if first non-ws token is "/" (see starts-regex.js)
289		$length = strlen($this->output);
290		if ($this->a === ' ' \|\| $this->a === "\n") {
291		if ($length < 2) { // weird edge case
292		return true;
293		}
294		}
295
296		// if the "/" follows a keyword, it must be a regexp, otherwise it's best to assume division
297
298		$subject = $this->output . trim($this->a);
299		if (!preg_match('/(?:case\|else\|in\|return\|typeof)$/', $subject, $m)) {
300		// not a keyword
301		return false;
302		}
303
304		// can't be sure it's a keyword yet (see not-regexp.js)
305		$charBeforeKeyword = substr($subject, 0 - strlen($m[0]) - 1, 1);
306		if ($this->isAlphaNum($charBeforeKeyword)) {
307		// this is really an identifier ending in a keyword, e.g. "xreturn"
308		return false;
309		}
310
311		// it's a regexp. Remove unneeded whitespace after keyword
312		if ($this->a === ' ' \|\| $this->a === "\n") {
313		$this->a = '';
314		}
315
316		return true;
317		}
318
319		/**
320		* Return the next character from stdin. Watch out for lookahead. If the character is a control character,
321		* translate it to a space or linefeed.
322		*
323		* @return string
324		*/
325		protected function get()
326		{
327		$c = $this->lookAhead;
328		$this->lookAhead = null;
329		if ($c === null) {
330		// getc(stdin)
331		if ($this->inputIndex < $this->inputLength) {
332		$c = $this->input[$this->inputIndex];
333		$this->inputIndex += 1;
334		} else {
335		$c = null;
336		}
337		}
338		if (ord($c) >= self::ORD_SPACE \|\| $c === "\n" \|\| $c === null) {
339		return $c;
340		}
341		if ($c === "\r") {
342		return "\n";
343		}
344		return ' ';
345		}
346
347		/**
348		* Does $a indicate end of input?
349		*
350		* @param string $a
351		* @return bool
352		*/
353		protected function isEOF($a)
354		{
355		return ord($a) <= self::ORD_LF;
356		}
357
358		/**
359		* Get next char (without getting it). If is ctrl character, translate to a space or newline.
360		*
361		* @return string
362		*/
363		protected function peek()
364		{
365		$this->lookAhead = $this->get();
366		return $this->lookAhead;
367		}
368
369		/**
370		* Return true if the character is a letter, digit, underscore, dollar sign, or non-ASCII character.
371		*
372		* @param string $c
373		*
374		* @return bool
375		*/
376		protected function isAlphaNum($c)
377		{
378		return (preg_match('/^[a-z0-9A-Z_\\$\\\\]$/', $c) \|\| ord($c) > 126);
379		}
380
381		/**
382		* Consume a single line comment from input (possibly retaining it)
383		*/
384		protected function consumeSingleLineComment()
385		{
386		$comment = '';
387		while (true) {
388		$get = $this->get();
389		$comment .= $get;
390		if (ord($get) <= self::ORD_LF) { // end of line reached
391		// if IE conditional comment
392		if (preg_match('/^\\/@(?:cc_on\|if\|elif\|else\|end)\\b/', $comment)) {
393		$this->keptComment .= "/{$comment}";
394		}
395		return;
396		}
397		}
398		}
399
400		/**
401		* Consume a multiple line comment from input (possibly retaining it)
402		*
403		* @throws JSMin_UnterminatedCommentException
404		*/
405		protected function consumeMultipleLineComment()
406		{
407		$this->get();
408		$comment = '';
409		for(;;) {
410		$get = $this->get();
411		if ($get === '*') {
412		if ($this->peek() === '/') { // end of comment reached
413		$this->get();
414		if (0 === strpos($comment, '!')) {
415		// preserved by YUI Compressor
416		if (!$this->keptComment) {
417		// don't prepend a newline if two comments right after one another
418		$this->keptComment = "\n";
419		}
420		$this->keptComment .= "/!" . substr($comment, 1) . "/\n";
421		} else if (preg_match('/^@(?:cc_on\|if\|elif\|else\|end)\\b/', $comment)) {
422		// IE conditional
423		$this->keptComment .= "/{$comment}/";
424		}
425		return;
426		}
427		} elseif ($get === null) {
428		throw new JSMin_UnterminatedCommentException(
429		"JSMin: Unterminated comment at byte {$this->inputIndex}: /*{$comment}");
430		}
431		$comment .= $get;
432		}
433		}
434
435		/**
436		* Get the next character, skipping over comments. Some comments may be preserved.
437		*
438		* @return string
439		*/
440		protected function next()
441		{
442		$get = $this->get();
443		if ($get === '/') {
444		switch ($this->peek()) {
445		case '/':
446		$this->consumeSingleLineComment();
447		$get = "\n";
448		break;
449		case '*':
450		$this->consumeMultipleLineComment();
451		$get = ' ';
452		break;
453		}
454		}
455		return $get;
456		}
457		}
458
459		class JSMin_UnterminatedStringException extends Exception {}
460		class JSMin_UnterminatedCommentException extends Exception {}
461		class JSMin_UnterminatedRegExpException extends Exception {}
462

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