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<?php
/**
 * Functions for helping process standards.
 *
 * @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/master/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Util;

use DirectoryIterator;
use PHP_CodeSniffer\Config;

class Standards
{

/**
     * Get a list of paths where standards are installed.
     *
     * Unresolvable relative paths will be excluded from the results.
     *
     * @return array
     */
    public static function getInstalledStandardPaths()
    {
        $ds = DIRECTORY_SEPARATOR;

$installedPaths = [dirname(dirname(__DIR__)).$ds.'src'.$ds.'Standards'];
        $configPaths    = Config::getConfigData('installed_paths');
        if ($configPaths !== null) {
            $installedPaths = array_merge($installedPaths, explode(',', $configPaths));
        }

$resolvedInstalledPaths = [];
        foreach ($installedPaths as $installedPath) {
            if (substr($installedPath, 0, 1) === '.') {
                $installedPath = Common::realpath(__DIR__.$ds.'..'.$ds.'..'.$ds.$installedPath);
                if ($installedPath === false) {
                    continue;
                }
            }

$resolvedInstalledPaths[] = $installedPath;
        }

return $resolvedInstalledPaths;

}//end getInstalledStandardPaths()

/**
     * Get the details of all coding standards installed.
     *
     * Coding standards are directories located in the
     * CodeSniffer/Standards directory. Valid coding standards
     * include a Sniffs subdirectory.
     *
     * The details returned for each standard are:
     * - path:      the path to the coding standard's main directory
     * - name:      the name of the coding standard, as sourced from the ruleset.xml file
     * - namespace: the namespace used by the coding standard, as sourced from the ruleset.xml file
     *
     * If you only need the paths to the installed standards,
     * use getInstalledStandardPaths() instead as it performs less work to
     * retrieve coding standard names.
     *
     * @param boolean $includeGeneric If true, the special "Generic"
     *                                coding standard will be included
     *                                if installed.
     * @param string  $standardsDir   A specific directory to look for standards
     *                                in. If not specified, PHP_CodeSniffer will
     *                                look in its default locations.
     *
     * @return array
     * @see    getInstalledStandardPaths()
     */
    public static function getInstalledStandardDetails(
        $includeGeneric=false,
        $standardsDir=''
    ) {
        $rulesets = [];

if ($standardsDir === '') {
            $installedPaths = self::getInstalledStandardPaths();
        } else {
            $installedPaths = [$standardsDir];
        }

foreach ($installedPaths as $standardsDir) {
            // Check if the installed dir is actually a standard itself.
            $csFile = $standardsDir.'/ruleset.xml';
            if (is_file($csFile) === true) {
                $rulesets[] = $csFile;
                continue;
            }

if (is_dir($standardsDir) === false) {
                continue;
            }

$di = new DirectoryIterator($standardsDir);
            foreach ($di as $file) {
                if ($file->isDir() === true && $file->isDot() === false) {
                    $filename = $file->getFilename();

// Ignore the special "Generic" standard.
                    if ($includeGeneric === false && $filename === 'Generic') {
                        continue;
                    }

// Valid coding standard dirs include a ruleset.
                    $csFile = $file->getPathname().'/ruleset.xml';
                    if (is_file($csFile) === true) {
                        $rulesets[] = $csFile;
                    }
                }
            }
        }//end foreach

$installedStandards = [];

foreach ($rulesets as $rulesetPath) {
            $ruleset = @simplexml_load_string(file_get_contents($rulesetPath));
            if ($ruleset === false) {
                continue;
            }

$standardName = (string) $ruleset['name'];
            $dirname      = basename(dirname($rulesetPath));

if (isset($ruleset['namespace']) === true) {
                $namespace = (string) $ruleset['namespace'];
            } else {
                $namespace = $dirname;
            }

$installedStandards[$dirname] = [
                'path'      => dirname($rulesetPath),
                'name'      => $standardName,
                'namespace' => $namespace,
            ];
        }//end foreach

return $installedStandards;

}//end getInstalledStandardDetails()

/**
     * Get a list of all coding standards installed.
     *
     * Coding standards are directories located in the
     * CodeSniffer/Standards directory. Valid coding standards
     * include a Sniffs subdirectory.
     *
     * @param boolean $includeGeneric If true, the special "Generic"
     *                                coding standard will be included
     *                                if installed.
     * @param string  $standardsDir   A specific directory to look for standards
     *                                in. If not specified, PHP_CodeSniffer will
     *                                look in its default locations.
     *
     * @return array
     * @see    isInstalledStandard()
     */
    public static function getInstalledStandards(
        $includeGeneric=false,
        $standardsDir=''
    ) {
        $installedStandards = [];

if ($standardsDir === '') {
            $installedPaths = self::getInstalledStandardPaths();
        } else {
            $installedPaths = [$standardsDir];
        }

foreach ($installedPaths as $standardsDir) {
            // Check if the installed dir is actually a standard itself.
            $csFile = $standardsDir.'/ruleset.xml';
            if (is_file($csFile) === true) {
                $basename = basename($standardsDir);
                $installedStandards[$basename] = $basename;
                continue;
            }

if (is_dir($standardsDir) === false) {
                // Doesn't exist.
                continue;
            }

$di = new DirectoryIterator($standardsDir);
            $standardsInDir = [];
            foreach ($di as $file) {
                if ($file->isDir() === true && $file->isDot() === false) {
                    $filename = $file->getFilename();

// Ignore the special "Generic" standard.
                    if ($includeGeneric === false && $filename === 'Generic') {
                        continue;
                    }

// Valid coding standard dirs include a ruleset.
                    $csFile = $file->getPathname().'/ruleset.xml';
                    if (is_file($csFile) === true) {
                        $standardsInDir[$filename] = $filename;
                    }
                }
            }

natsort($standardsInDir);
            $installedStandards += $standardsInDir;
        }//end foreach

return $installedStandards;

}//end getInstalledStandards()

/**
     * Determine if a standard is installed.
     *
     * Coding standards are directories located in the
     * CodeSniffer/Standards directory. Valid coding standards
     * include a ruleset.xml file.
     *
     * @param string $standard The name of the coding standard.
     *
     * @return boolean
     * @see    getInstalledStandards()
     */
    public static function isInstalledStandard($standard)
    {
        $path = self::getInstalledStandardPath($standard);
        if ($path !== null && strpos($path, 'ruleset.xml') !== false) {
            return true;
        } else {
            // This could be a custom standard, installed outside our
            // standards directory.
            $standard = Common::realpath($standard);
            if ($standard === false) {
                return false;
            }

// Might be an actual ruleset file itUtil.
            // If it has an XML extension, let's at least try it.
            if (is_file($standard) === true
                && (substr(strtolower($standard), -4) === '.xml'
                || substr(strtolower($standard), -9) === '.xml.dist')
            ) {
                return true;
            }

// If it is a directory with a ruleset.xml file in it,
            // it is a standard.
            $ruleset = rtrim($standard, ' /\\').DIRECTORY_SEPARATOR.'ruleset.xml';
            if (is_file($ruleset) === true) {
                return true;
            }
        }//end if

return false;

}//end isInstalledStandard()

/**
     * Return the path of an installed coding standard.
     *
     * Coding standards are directories located in the
     * CodeSniffer/Standards directory. Valid coding standards
     * include a ruleset.xml file.
     *
     * @param string $standard The name of the coding standard.
     *
     * @return string|null
     */
    public static function getInstalledStandardPath($standard)
    {
        if (strpos($standard, '.') !== false) {
            return null;
        }

$installedPaths = self::getInstalledStandardPaths();
        foreach ($installedPaths as $installedPath) {
            $standardPath = $installedPath.DIRECTORY_SEPARATOR.$standard;
            if (file_exists($standardPath) === false) {
                if (basename($installedPath) !== $standard) {
                    continue;
                }

$standardPath = $installedPath;
            }

$path = Common::realpath($standardPath.DIRECTORY_SEPARATOR.'ruleset.xml');

if ($path !== false && is_file($path) === true) {
                return $path;
            } else if (Common::isPharFile($standardPath) === true) {
                $path = Common::realpath($standardPath);
                if ($path !== false) {
                    return $path;
                }
            }
        }//end foreach

return null;

}//end getInstalledStandardPath()

/**
     * Prints out a list of installed coding standards.
     *
     * @return void
     */
    public static function printInstalledStandards()
    {
        $installedStandards = self::getInstalledStandards();
        $numStandards       = count($installedStandards);

if ($numStandards === 0) {
            echo 'No coding standards are installed.'.PHP_EOL;
        } else {
            $lastStandard = array_pop($installedStandards);
            if ($numStandards === 1) {
                echo "The only coding standard installed is $lastStandard".PHP_EOL;
            } else {
                $standardList  = implode(', ', $installedStandards);
                $standardList .= ' and '.$lastStandard;
                echo 'The installed coding standards are '.$standardList.PHP_EOL;
            }
        }

}//end printInstalledStandards()

}//end class

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