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Editing: Minify.php

<?php
/**
 * Abstract minifier class
 *
 * 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;

use WP_Rocket\Dependencies\Minify\Exceptions\IOException;
use Psr\Cache\CacheItemInterface;

/**
 * Abstract minifier class.
 *
 * Please report bugs on https://github.com/matthiasmullie/minify/issues
 *
 * @package Minify
 * @author Matthias Mullie <minify@mullie.eu>
 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
 * @license MIT License
 */
abstract class Minify
{
	/**
	 * The data to be minified.
	 *
	 * @var string[]
	 */
	protected $data = array();

/**
	 * Array of patterns to match.
	 *
	 * @var string[]
	 */
	protected $patterns = array();

/**
	 * This array will hold content of strings and regular expressions that have
	 * been extracted from the JS source code, so we can reliably match "code",
	 * without having to worry about potential "code-like" characters inside.
	 *
	 * @var string[]
	 */
	public $extracted = array();

/**
	 * Init the minify class - optionally, code may be passed along already.
	 */
	public function __construct(/* $data = null, ... */)
	{
		// it's possible to add the source through the constructor as well ;)
		if (func_num_args()) {
			call_user_func_array(array($this, 'add'), func_get_args());
		}
	}

/**
	 * Add a file or straight-up code to be minified.
	 *
	 * @param string|string[] $data
	 *
	 * @return static
	 */
	public function add($data /* $data = null, ... */)
	{
		// bogus "usage" of parameter $data: scrutinizer warns this variable is
		// not used (we're using func_get_args instead to support overloading),
		// but it still needs to be defined because it makes no sense to have
		// this function without argument :)
		$args = array($data) + func_get_args();

// this method can be overloaded
		foreach ($args as $data) {
			if (is_array($data)) {
				call_user_func_array(array($this, 'add'), $data);
				continue;
			}

// redefine var
			$data = (string) $data;

// load data
			$value = $this->load($data);
			$key = ($data != $value) ? $data : count($this->data);

// replace CR linefeeds etc.
			// @see https://github.com/matthiasmullie/minify/pull/139
			$value = str_replace(array("\r\n", "\r"), "\n", $value);

// store data
			$this->data[$key] = $value;
		}

return $this;
	}

/**
	 * Add a file to be minified.
	 *
	 * @param string|string[] $data
	 *
	 * @return static
	 *
	 * @throws IOException
	 */
	public function addFile($data /* $data = null, ... */)
	{
		// bogus "usage" of parameter $data: scrutinizer warns this variable is
		// not used (we're using func_get_args instead to support overloading),
		// but it still needs to be defined because it makes no sense to have
		// this function without argument :)
		$args = array($data) + func_get_args();

// this method can be overloaded
		foreach ($args as $path) {
			if (is_array($path)) {
				call_user_func_array(array($this, 'addFile'), $path);
				continue;
			}

// redefine var
			$path = (string) $path;

// check if we can read the file
			if (!$this->canImportFile($path)) {
				throw new IOException('The file "'.$path.'" could not be opened for reading. Check if PHP has enough permissions.');
			}

$this->add($path);
		}

return $this;
	}

/**
	 * Minify the data & (optionally) saves it to a file.
	 *
	 * @param string[optional] $path Path to write the data to
	 *
	 * @return string The minified data
	 */
	public function minify($path = null)
	{
		$content = $this->execute($path);

// save to path
		if ($path !== null) {
			$this->save($content, $path);
		}

return $content;
	}

/**
	 * Minify & gzip the data & (optionally) saves it to a file.
	 *
	 * @param string[optional] $path  Path to write the data to
	 * @param int[optional]    $level Compression level, from 0 to 9
	 *
	 * @return string The minified & gzipped data
	 */
	public function gzip($path = null, $level = 9)
	{
		$content = $this->execute($path);
		$content = gzencode($content, $level, FORCE_GZIP);

// save to path
		if ($path !== null) {
			$this->save($content, $path);
		}

return $content;
	}

/**
	 * Minify the data & write it to a CacheItemInterface object.
	 *
	 * @param CacheItemInterface $item Cache item to write the data to
	 *
	 * @return CacheItemInterface Cache item with the minifier data
	 */
	public function cache(CacheItemInterface $item)
	{
		$content = $this->execute();
		$item->set($content);

return $item;
	}

/**
	 * Minify the data.
	 *
	 * @param string[optional] $path Path to write the data to
	 *
	 * @return string The minified data
	 */
	abstract public function execute($path = null);

/**
	 * Load data.
	 *
	 * @param string $data Either a path to a file or the content itself
	 *
	 * @return string
	 */
	protected function load($data)
	{
		// check if the data is a file
		if ($this->canImportFile($data)) {
			$data = file_get_contents($data);

// strip BOM, if any
			if (substr($data, 0, 3) == "\xef\xbb\xbf") {
				$data = substr($data, 3);
			}
		}

return $data;
	}

/**
	 * Save to file.
	 *
	 * @param string $content The minified data
	 * @param string $path    The path to save the minified data to
	 *
	 * @throws IOException
	 */
	protected function save($content, $path)
	{
		$handler = $this->openFileForWriting($path);

$this->writeToFile($handler, $content);

@fclose($handler);
	}

/**
	 * Register a pattern to execute against the source content.
	 *
	 * If $replacement is a string, it must be plain text. Placeholders like $1 or \2 don't work.
	 * If you need that functionality, use a callback instead.
	 *
	 * @param string          $pattern     PCRE pattern
	 * @param string|callable $replacement Replacement value for matched pattern
	 */
	protected function registerPattern($pattern, $replacement = '')
	{
		// study the pattern, we'll execute it more than once
		$pattern .= 'S';

$this->patterns[] = array($pattern, $replacement);
	}

/**
	 * We can't "just" run some regular expressions against JavaScript: it's a
	 * complex language. E.g. having an occurrence of // xyz would be a comment,
	 * unless it's used within a string. Of you could have something that looks
	 * like a 'string', but inside a comment.
	 * The only way to accurately replace these pieces is to traverse the JS one
	 * character at a time and try to find whatever starts first.
	 *
	 * @param string $content The content to replace patterns in
	 *
	 * @return string The (manipulated) content
	 */
	protected function replace($content)
	{
		$contentLength = strlen($content);
		$output = '';
		$processedOffset = 0;
		$positions = array_fill(0, count($this->patterns), -1);
		$matches = array();

while ($processedOffset < $contentLength) {
			// find first match for all patterns
			foreach ($this->patterns as $i => $pattern) {
				list($pattern, $replacement) = $pattern;

// we can safely ignore patterns for positions we've unset earlier,
				// because we know these won't show up anymore
				if (array_key_exists($i, $positions) == false) {
					continue;
				}

// no need to re-run matches that are still in the part of the
				// content that hasn't been processed
				if ($positions[$i] >= $processedOffset) {
					continue;
				}

$match = null;
				if (preg_match($pattern, $content, $match, PREG_OFFSET_CAPTURE, $processedOffset)) {
					$matches[$i] = $match;

// we'll store the match position as well; that way, we
					// don't have to redo all preg_matches after changing only
					// the first (we'll still know where those others are)
					$positions[$i] = $match[0][1];
				} else {
					// if the pattern couldn't be matched, there's no point in
					// executing it again in later runs on this same content;
					// ignore this one until we reach end of content
					unset($matches[$i], $positions[$i]);
				}
			}

// no more matches to find: everything's been processed, break out
			if (!$matches) {
				// output the remaining content
				$output .= substr($content, $processedOffset);
				break;
			}

// see which of the patterns actually found the first thing (we'll
			// only want to execute that one, since we're unsure if what the
			// other found was not inside what the first found)
			$matchOffset = min($positions);
			$firstPattern = array_search($matchOffset, $positions);
			$match = $matches[$firstPattern];

// execute the pattern that matches earliest in the content string
			list(, $replacement) = $this->patterns[$firstPattern];

// add the part of the input between $processedOffset and the first match;
			// that content wasn't matched by anything
			$output .= substr($content, $processedOffset, $matchOffset - $processedOffset);
			// add the replacement for the match
			$output .= $this->executeReplacement($replacement, $match);
			// advance $processedOffset past the match
			$processedOffset = $matchOffset + strlen($match[0][0]);
		}

return $output;
	}

/**
	 * If $replacement is a callback, execute it, passing in the match data.
	 * If it's a string, just pass it through.
	 *
	 * @param string|callable $replacement Replacement value
	 * @param array           $match       Match data, in PREG_OFFSET_CAPTURE form
	 *
	 * @return string
	 */
	protected function executeReplacement($replacement, $match)
	{
		if (!is_callable($replacement)) {
			return $replacement;
		}
		// convert $match from the PREG_OFFSET_CAPTURE form to the form the callback expects
		foreach ($match as &$matchItem) {
			$matchItem = $matchItem[0];
		}
		return $replacement($match);
	}

/**
	 * Strings are a pattern we need to match, in order to ignore potential
	 * code-like content inside them, but we just want all of the string
	 * content to remain untouched.
	 *
	 * This method will replace all string content with simple STRING#
	 * placeholder text, so we've rid all strings from characters that may be
	 * misinterpreted. Original string content will be saved in $this->extracted
	 * and after doing all other minifying, we can restore the original content
	 * via restoreStrings().
	 *
	 * @param string[optional] $chars
	 * @param string[optional] $placeholderPrefix
	 */
	protected function extractStrings($chars = '\'"', $placeholderPrefix = '')
	{
		// PHP only supports $this inside anonymous functions since 5.4
		$minifier = $this;
		$callback = function ($match) use ($minifier, $placeholderPrefix) {
			// check the second index here, because the first always contains a quote
			if ($match[2] === '') {
				/*
				 * Empty strings need no placeholder; they can't be confused for
				 * anything else anyway.
				 * But we still needed to match them, for the extraction routine
				 * to skip over this particular string.
				 */
				return $match[0];
			}

$count = count($minifier->extracted);
			$placeholder = $match[1].$placeholderPrefix.$count.$match[1];
			$minifier->extracted[$placeholder] = $match[1].$match[2].$match[1];

return $placeholder;
		};

/*
		 * The \\ messiness explained:
		 * * Don't count ' or " as end-of-string if it's escaped (has backslash
		 * in front of it)
		 * * Unless... that backslash itself is escaped (another leading slash),
		 * in which case it's no longer escaping the ' or "
		 * * So there can be either no backslash, or an even number
		 * * multiply all of that times 4, to account for the escaping that has
		 * to be done to pass the backslash into the PHP string without it being
		 * considered as escape-char (times 2) and to get it in the regex,
		 * escaped (times 2)
		 */
		$this->registerPattern('/(['.$chars.'])(.*?(?<!\\\\)(\\\\\\\\)*+)\\1/s', $callback);
	}

/**
	 * This method will restore all extracted data (strings, regexes) that were
	 * replaced with placeholder text in extract*(). The original content was
	 * saved in $this->extracted.
	 *
	 * @param string $content
	 *
	 * @return string
	 */
	protected function restoreExtractedData($content)
	{
		if (!$this->extracted) {
			// nothing was extracted, nothing to restore
			return $content;
		}

$content = strtr($content, $this->extracted);

$this->extracted = array();

return $content;
	}

/**
	 * Check if the path is a regular file and can be read.
	 *
	 * @param string $path
	 *
	 * @return bool
	 */
	protected function canImportFile($path)
	{
		$parsed = parse_url($path);
		if (
			// file is elsewhere
			isset($parsed['host']) ||
			// file responds to queries (may change, or need to bypass cache)
			isset($parsed['query'])
		) {
			return false;
		}

return strlen($path) < PHP_MAXPATHLEN && @is_file($path) && is_readable($path);
	}

/**
	 * Attempts to open file specified by $path for writing.
	 *
	 * @param string $path The path to the file
	 *
	 * @return resource Specifier for the target file
	 *
	 * @throws IOException
	 */
	protected function openFileForWriting($path)
	{
		if ($path === '' || ($handler = @fopen($path, 'w')) === false) {
			throw new IOException('The file "'.$path.'" could not be opened for writing. Check if PHP has enough permissions.');
		}

return $handler;
	}

/**
	 * Attempts to write $content to the file specified by $handler. $path is used for printing exceptions.
	 *
	 * @param resource $handler The resource to write to
	 * @param string   $content The content to write
	 * @param string   $path    The path to the file (for exception printing only)
	 *
	 * @throws IOException
	 */
	protected function writeToFile($handler, $content, $path = '')
	{
		if (
			!is_resource($handler) ||
			($result = @fwrite($handler, $content)) === false ||
			($result < strlen($content))
		) {
			throw new IOException('The file "'.$path.'" could not be written to. Check your disk space and file permissions.');
		}
	}
}

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