diff options
Diffstat (limited to 'admin/survey/minify/vendor/mrclay/jsmin-php/src/JSMin/JSMin.php')
| -rw-r--r-- | admin/survey/minify/vendor/mrclay/jsmin-php/src/JSMin/JSMin.php | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/admin/survey/minify/vendor/mrclay/jsmin-php/src/JSMin/JSMin.php b/admin/survey/minify/vendor/mrclay/jsmin-php/src/JSMin/JSMin.php new file mode 100644 index 0000000..9dc2e20 --- /dev/null +++ b/admin/survey/minify/vendor/mrclay/jsmin-php/src/JSMin/JSMin.php @@ -0,0 +1,454 @@ +<?php
+
+namespace JSMin;
+
+/**
+ * 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 <ryan@wonko.com> (PHP port)
+ * @author Steve Clay <steve@mrclay.org> (modifications + cleanup)
+ * @author Andrea Giammarchi <http://www.3site.eu> (spaceBeforeRegExp)
+ * @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c)
+ * @copyright 2008 Ryan Grove <ryan@wonko.com> (PHP port)
+ * @license http://opensource.org/licenses/mit-license.php MIT License
+ * @link http://code.google.com/p/jsmin-php/
+ */
+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 $command
+ * @throws UnterminatedRegExpException|UnterminatedStringException
+ */
+ protected function action($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 === '"') { // string literal
+ $str = $this->a; // in case needed for exception
+ for(;;) {
+ $this->output .= $this->a;
+ $this->lastByteOut = $this->a;
+
+ $this->a = $this->get();
+ if ($this->a === $this->b) { // end quote
+ break;
+ }
+ if ($this->isEOF($this->a)) {
+ $byte = $this->inputIndex - 1;
+ throw new UnterminatedStringException(
+ "JSMin: Unterminated String at byte {$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 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 = $this->inputIndex - 1;
+ throw new UnterminatedRegExpException(
+ "JSMin: Unterminated RegExp at byte {$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 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 ($get === null) {
+ throw new UnterminatedCommentException(
+ "JSMin: Unterminated comment at byte {$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;
+ }
+}
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