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✏️ Editing: Cache.php

<?php
/**
 * Function for caching between runs.
 *
 * @author    Greg Sherwood <gsherwood@squiz.net>
 * @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
 * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Util;

use FilesystemIterator;
use PHP_CodeSniffer\Autoload;
use PHP_CodeSniffer\Config;
use PHP_CodeSniffer\Ruleset;
use RecursiveCallbackFilterIterator;
use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;

class Cache
{

/**
     * The filesystem location of the cache file.
     *
     * @var string
     */
    private static $path = '';

/**
     * The cached data.
     *
     * @var array<string, mixed>
     */
    private static $cache = [];

/**
     * Loads existing cache data for the run, if any.
     *
     * @param \PHP_CodeSniffer\Ruleset $ruleset The ruleset used for the run.
     * @param \PHP_CodeSniffer\Config  $config  The config data for the run.
     *
     * @return void
     */
    public static function load(Ruleset $ruleset, Config $config)
    {
        // Look at every loaded sniff class so far and use their file contents
        // to generate a hash for the code used during the run.
        // At this point, the loaded class list contains the core PHPCS code
        // and all sniffs that have been loaded as part of the run.
        if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo PHP_EOL."\tGenerating loaded file list for code hash".PHP_EOL;
        }

$codeHashFiles = [];

$classes = array_keys(Autoload::getLoadedClasses());
        sort($classes);

$installDir     = dirname(__DIR__);
        $installDirLen  = strlen($installDir);
        $standardDir    = $installDir.DIRECTORY_SEPARATOR.'Standards';
        $standardDirLen = strlen($standardDir);
        foreach ($classes as $file) {
            if (substr($file, 0, $standardDirLen) !== $standardDir) {
                if (substr($file, 0, $installDirLen) === $installDir) {
                    // We are only interested in sniffs here.
                    continue;
                }

if (PHP_CODESNIFFER_VERBOSITY > 1) {
                    echo "\t\t=> external file: $file".PHP_EOL;
                }
            } else if (PHP_CODESNIFFER_VERBOSITY > 1) {
                echo "\t\t=> internal sniff: $file".PHP_EOL;
            }

$codeHashFiles[] = $file;
        }

// Add the content of the used rulesets to the hash so that sniff setting
        // changes in the ruleset invalidate the cache.
        $rulesets = $ruleset->paths;
        sort($rulesets);
        foreach ($rulesets as $file) {
            if (substr($file, 0, $standardDirLen) !== $standardDir) {
                if (PHP_CODESNIFFER_VERBOSITY > 1) {
                    echo "\t\t=> external ruleset: $file".PHP_EOL;
                }
            } else if (PHP_CODESNIFFER_VERBOSITY > 1) {
                echo "\t\t=> internal ruleset: $file".PHP_EOL;
            }

$codeHashFiles[] = $file;
        }

// Go through the core PHPCS code and add those files to the file
        // hash. This ensures that core PHPCS changes will also invalidate the cache.
        // Note that we ignore sniffs here, and any files that don't affect
        // the outcome of the run.
        $di     = new RecursiveDirectoryIterator(
            $installDir,
            (FilesystemIterator::KEY_AS_PATHNAME | FilesystemIterator::CURRENT_AS_FILEINFO | FilesystemIterator::SKIP_DOTS)
        );
        $filter = new RecursiveCallbackFilterIterator(
            $di,
            static function ($file, $key, $iterator) {
                // Skip non-php files.
                $filename = $file->getFilename();
                if ($file->isFile() === true && substr($filename, -4) !== '.php') {
                    return false;
                }

$filePath = Common::realpath($key);
                if ($filePath === false) {
                    return false;
                }

if ($iterator->hasChildren() === true
                    && ($filename === 'Standards'
                    || $filename === 'Exceptions'
                    || $filename === 'Reports'
                    || $filename === 'Generators')
                ) {
                    return false;
                }

return true;
            }
        );

$iterator = new RecursiveIteratorIterator($filter);
        foreach ($iterator as $file) {
            if (PHP_CODESNIFFER_VERBOSITY > 1) {
                echo "\t\t=> core file: $file".PHP_EOL;
            }

$codeHashFiles[] = $file->getPathname();
        }

$codeHash = '';
        sort($codeHashFiles);
        foreach ($codeHashFiles as $file) {
            $codeHash .= md5_file($file);
        }

$codeHash = md5($codeHash);

// Along with the code hash, use various settings that can affect
        // the results of a run to create a new hash. This hash will be used
        // in the cache file name.
        $rulesetHash       = md5(var_export($ruleset->ignorePatterns, true).var_export($ruleset->includePatterns, true));
        $phpExtensionsHash = md5(var_export(get_loaded_extensions(), true));
        $configData        = [
            'phpVersion'    => PHP_VERSION_ID,
            'phpExtensions' => $phpExtensionsHash,
            'tabWidth'      => $config->tabWidth,
            'encoding'      => $config->encoding,
            'recordErrors'  => $config->recordErrors,
            'annotations'   => $config->annotations,
            'configData'    => Config::getAllConfigData(),
            'codeHash'      => $codeHash,
            'rulesetHash'   => $rulesetHash,
        ];

$configString = var_export($configData, true);
        $cacheHash    = substr(sha1($configString), 0, 12);

if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo "\tGenerating cache key data".PHP_EOL;
            foreach ($configData as $key => $value) {
                if (is_array($value) === true) {
                    echo "\t\t=> $key:".PHP_EOL;
                    foreach ($value as $subKey => $subValue) {
                        echo "\t\t\t=> $subKey: $subValue".PHP_EOL;
                    }

continue;
                }

if ($value === true || $value === false) {
                    $value = (int) $value;
                }

echo "\t\t=> $key: $value".PHP_EOL;
            }

echo "\t\t=> cacheHash: $cacheHash".PHP_EOL;
        }//end if

if ($config->cacheFile !== null) {
            $cacheFile = $config->cacheFile;
        } else {
            // Determine the common paths for all files being checked.
            // We can use this to locate an existing cache file, or to
            // determine where to create a new one.
            if (PHP_CODESNIFFER_VERBOSITY > 1) {
                echo "\tChecking possible cache file paths".PHP_EOL;
            }

$paths = [];
            foreach ($config->files as $file) {
                $file = Common::realpath($file);
                while ($file !== DIRECTORY_SEPARATOR) {
                    if (isset($paths[$file]) === false) {
                        $paths[$file] = 1;
                    } else {
                        $paths[$file]++;
                    }

$lastFile = $file;
                    $file     = dirname($file);
                    if ($file === $lastFile) {
                        // Just in case something went wrong,
                        // we don't want to end up in an infinite loop.
                        break;
                    }
                }
            }

ksort($paths);
            $paths = array_reverse($paths);

$numFiles = count($config->files);

$cacheFile = null;
            $cacheDir  = getenv('XDG_CACHE_HOME');
            if ($cacheDir === false || is_dir($cacheDir) === false) {
                $cacheDir = sys_get_temp_dir();
            }

foreach ($paths as $file => $count) {
                if ($count !== $numFiles) {
                    unset($paths[$file]);
                    continue;
                }

$fileHash = substr(sha1($file), 0, 12);
                $testFile = $cacheDir.DIRECTORY_SEPARATOR."phpcs.$fileHash.$cacheHash.cache";
                if ($cacheFile === null) {
                    // This will be our default location if we can't find
                    // an existing file.
                    $cacheFile = $testFile;
                }

if (PHP_CODESNIFFER_VERBOSITY > 1) {
                    echo "\t\t=> $testFile".PHP_EOL;
                    echo "\t\t\t * based on shared location: $file *".PHP_EOL;
                }

if (file_exists($testFile) === true) {
                    $cacheFile = $testFile;
                    break;
                }
            }//end foreach

if ($cacheFile === null) {
                // Unlikely, but just in case $paths is empty for some reason.
                $cacheFile = $cacheDir.DIRECTORY_SEPARATOR."phpcs.$cacheHash.cache";
            }
        }//end if

self::$path = $cacheFile;
        if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo "\t=> Using cache file: ".self::$path.PHP_EOL;
        }

if (file_exists(self::$path) === true) {
            self::$cache = json_decode(file_get_contents(self::$path), true);

// Verify the contents of the cache file.
            if (self::$cache['config'] !== $configData) {
                self::$cache = [];
                if (PHP_CODESNIFFER_VERBOSITY > 1) {
                    echo "\t* cache was invalid and has been cleared *".PHP_EOL;
                }
            }
        } else if (PHP_CODESNIFFER_VERBOSITY > 1) {
            echo "\t* cache file does not exist *".PHP_EOL;
        }

self::$cache['config'] = $configData;

}//end load()

/**
     * Saves the current cache to the filesystem.
     *
     * @return void
     */
    public static function save()
    {
        file_put_contents(self::$path, json_encode(self::$cache));

}//end save()

/**
     * Retrieves a single entry from the cache.
     *
     * @param string|null $key The key of the data to get. If NULL,
     *                         everything in the cache is returned.
     *
     * @return mixed
     */
    public static function get($key=null)
    {
        if ($key === null) {
            return self::$cache;
        }

if (isset(self::$cache[$key]) === true) {
            return self::$cache[$key];
        }

return false;

}//end get()

/**
     * Retrieves a single entry from the cache.
     *
     * @param string|null $key   The key of the data to set. If NULL,
     *                           sets the entire cache.
     * @param mixed       $value The value to set.
     *
     * @return void
     */
    public static function set($key, $value)
    {
        if ($key === null) {
            self::$cache = $value;
        } else {
            self::$cache[$key] = $value;
        }

}//end set()

/**
     * Retrieves the number of cache entries.
     *
     * @return int
     */
    public static function getSize()
    {
        return (count(self::$cache) - 1);

}//end getSize()

}//end class

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