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home / haielekt / videotronindonesia.co.id / wp-content / plugins / wp-rocket / inc / Dependencies / Minify /

📁 ..
📄 CSS.php(22.36 KB)
📄 Exception.php(380 B)
📁 Exceptions
📄 JS.php(35.78 KB)
📄 Minify.php(13.56 KB)
📁 data

Editing: JS.php

<?php
/**
 * JavaScript minifier
 *
 * Please report bugs on https://github.com/matthiasmullie/minify/issues
 *
 * @author Matthias Mullie <minify@mullie.eu>
 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
 * @license MIT License
 */
namespace WP_Rocket\Dependencies\Minify;

/**
 * JavaScript Minifier Class
 *
 * Please report bugs on https://github.com/matthiasmullie/minify/issues
 *
 * @package Minify
 * @author Matthias Mullie <minify@mullie.eu>
 * @author Tijs Verkoyen <minify@verkoyen.eu>
 * @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 <variable, value, ...>
	 * after them. Some end of lines are not the end of a statement, like with
	 * these keywords.
	 *
	 * E.g.: we shouldn't insert a ; after this else
	 * else
	 *     console.log('this is quite fine')
	 *
	 * Will be loaded from /data/js/keywords_before.txt
	 *
	 * @var string[]
	 */
	protected $keywordsBefore = array();

/**
	 * List of JavaScript reserved words that accept a <variable, value, ...>
	 * 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'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 <variable, value, ...> after
	 * them. Some end of lines are not the end of a statement, like with these
	 * operators.
	 *
	 * Note: Most operators are fine, we've only removed ++ and --.
	 * ++ & -- have to be joined with the value they'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 <variable, value, ...> 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've only removed ), ], ++, --, ! and ~.
	 * There can't be a newline separating ! or ~ and whatever it is negating.
	 * ++ & -- have to be joined with the value they're in-/decrementing.
	 * ) & ] are "special" 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('\\WP_Rocket\Dependencies\Minify\\Minify', '__construct'), func_get_args());

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

/*
		 * Let'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 = "a   test";
		 *
		 * Comments will be removed altogether, strings and regular expressions
		 * will be replaced by placeholder text, which we'll restore later.
		 */
		$this->extractStrings('\'"`');
		$this->stripComments();
		$this->extractRegex();

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

$js = $this->propertyNotation($js);
			$js = $this->shortenBools($js);
			$js = $this->stripWhitespace($js);

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

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

/*
		 * Earlier, we extracted strings & regular expressions and replaced them
		 * with placeholder text. This will restore them.
		 */
		$content = $this->restoreExtractedData($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 ($minifier) {
			if (
				substr($match[1], 0, 1) === '!' ||
				strpos($match[1], '@license') !== false ||
				strpos($match[1], '@preserve') !== false
			) {
				// preserve multi-line comments that start with /*!
				// or contain @license or @preserve annotations
				$count = count($minifier->extracted);
				$placeholder = '/*'.$count.'*/';
				$minifier->extracted[$placeholder] = $match[0];

return $placeholder;
			}

return '';
		};

// multi-line comments
		$this->registerPattern('/\n?\/\*(.*?)\*\/\n?/s', $callback);

// single-line comments
		$this->registerPattern('/\/\/.*$/m', '');
	}

/**
	 * 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 & we
	 * don't want to strip whitespace in there.
	 *
	 * The regex can be pretty simple: we don'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've rid all regular expressions from characters
	 * that may be misinterpreted. Original regex content will be saved in
	 * $this->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->extracted);
			$placeholder = '"'.$count.'"';
			$minifier->extracted[$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't need to be
		// escaped: anything inside `[]` can be ignored safely
		$pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*';

// 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('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return',  'typeof');
		$before = '(^|[=:,;\+\-\*\/\}$\{\[&\|!]|'.implode('|', $keywords).')\s*';
		$propertiesAndMethods = array(
			// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2
			'constructor',
			'flags',
			'global',
			'ignoreCase',
			'multiline',
			'source',
			'sticky',
			'unicode',
			// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
			'compile(',
			'exec(',
			'test(',
			'toSource(',
			'toString(',
		);
		$delimiters = array_fill(0, count($propertiesAndMethods), '/');
		$propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters);
		$after = '(?=\s*([\.,;$\}&\|+]|\/\/|$|\.('.implode('|', $propertiesAndMethods).')))';
		$this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback);

// regular expressions following a `)` are rather annoying to detect...
		// quite often, `/` after `)` is a division operator & if it happens to
		// be followed by another one (or a comment), it is likely to be
		// confused for a regular expression
		// however, it'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're always the start of a
		// statement, there'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 `.<property or method>`,
		// it's quite likely not a regex
		$before = '\)\s*';
		$after = '(?=\s*\.('.implode('|', $propertiesAndMethods).'))';
		$this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback);

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

/**
	 * Strip whitespace.
	 *
	 * We won't strip *all* whitespace, but as much as possible. The thing that
	 * we'll preserve are newlines we're unsure about.
	 * JavaScript doesn'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's sometimes hard to tell if a newline is part of a statement
	 * that should be terminated or not, we'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("\r\n", "\r"), "\n", $content);

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

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

// collapse consecutive line feeds into just 1
		$content = preg_replace('/\n+/', "\n", $content);

$operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/');
		$operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/');
		$operators = $this->getOperatorsForRegex($this->operators, '/');
		$keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/');
		$keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/');

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

// make sure + and - can't be mistaken for, or joined into ++ and --
		$content = preg_replace(
			array(
				'/(?<![\+\-])\s*([\+\-])(?![\+\-])/',
				'/(?<![\+\-])([\+\-])\s*(?![\+\-])/',
			),
			'\\1',
			$content
		);

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

/*
		 * We didn't strip whitespace after a couple of operators because they
		 * could be used in different contexts and we can't be sure it'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('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content);
		$content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $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('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content);
		$content = preg_replace('/\)\s+\{/', '){', $content);
		$content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content);

/*
		 * Get rid of double semicolons, except where they can be used like:
		 * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))".
		 * I'll safeguard these double semicolons inside for-loops by
		 * temporarily replacing them with an invalid condition: they won't have
		 * a double semicolon and will be easy to spot to restore afterwards.
		 */
		$content = preg_replace('/\bfor$([^;]*);;([^;]*)$/', 'for(\\1;-;\\2)', $content);
		$content = preg_replace('/;+/', ';', $content);
		$content = preg_replace('/\bfor$([^;]*);-;([^;]*)$/', 'for(\\1;;\\2)', $content);

/*
		 * Next, we'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<3;i++);`, of `for(i in list);`
		 * Here, nothing happens during the loop; it's just used to keep
		 * increasing `i`. With that ; omitted, the next line would be expected
		 * to be the for-loop's body... Same goes for while loops.
		 * I'm going to double that semicolon (if any) so after the next line,
		 * which strips semicolons here & there, we're still left with this one.
		 */
		$content = preg_replace('/(for$[^;\{]*;[^;\{]*;[^;\{]*$);(\}|$)/s', '\\1;;\\2', $content);
		$content = preg_replace('/(for$[^;\{]+\s+in\s+[^;\{]+$);(\}|$)/s', '\\1;;\\2', $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'll play it safe and make sure `;`
		 * after any kind of `while` is kept.
		 */
		$content = preg_replace('/(while$[^;\{]+$);(\}|$)/s', '\\1;;\\2', $content);

/*
		 * We also can't strip empty else-statements. Even though they're
		 * useless and probably shouldn't be in the code in the first place, we
		 * shouldn'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('/else;/s', '', $content);

/*
		 * We also don't really want to terminate statements followed by closing
		 * curly braces (which we've ignored completely up until now) or end-of-
		 * script: ASI will kick in here & we're all about minifying.
		 * Semicolons at beginning of the file don't make any sense either.
		 */
		$content = preg_replace('/;(\}|$)/s', '\\1', $content);
		$content = ltrim($content, ';');

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

/**
	 * We'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 = '/')
	{
		// escape operators for use in regex
		$delimiters = array_fill(0, count($operators), $delimiter);
		$escaped = array_map('preg_quote', $operators, $delimiters);

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

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

// 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['.'] = '(?<![0-9]\s)\.';

// don't confuse = with other assignment shortcuts (e.g. +=)
		$chars = preg_quote('+-*\=<>%&|', $delimiter);
		$operators['='] = '(?<!['.$chars.'])\=';

return $operators;
	}

/**
	 * We'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 = '/')
	{
		// escape keywords for use in regex
		$delimiter = array_fill(0, count($keywords), $delimiter);
		$escaped = array_map('preg_quote', $keywords, $delimiter);

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

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

return $keywords;
	}

/**
	 * Replaces all occurrences of array['key'] 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->keywordsReserved;
		$callback = function ($match) use ($minifier, $keywords) {
			$property = trim($minifier->extracted[$match[1]], '\'"');

/*
			 * Check if the property is a reserved keyword. In this context (as
			 * property of an object literal/array) it shouldn't matter, but IE8
			 * freaks out with "Expected identifier".
			 */
			if (in_array($property, $keywords)) {
				return $match[0];
			}

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

return '.'.$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 ['value'] arrays aren't confused for keys-of-an-array.
		 * We can (and only have to) check the last character, because PHP's
		 * regex implementation doesn't allow unfixed-length look-behind
		 * assertions.
		 */
		preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar);
		$previousChar = $previousChar[1];

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

return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content);
	}

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

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

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

// now make sure we didn't turn any do ... while(true) into do ... for(;;)
		preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);

// go backward to make sure positional offsets aren'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('/\bfor$;;$/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo);
			foreach ($whiles as $while) {
				$offsetWhile = $while[0][1];

$open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo);
				$close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo);
				if ($open === $close) {
					// only restore `while` if amount of `{` and `}` are the same;
					// otherwise, that `for` isn't associated with this `do`
					$content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)'));
					break;
				}
			}
		}

return $content;
	}
}

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