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name : Protocol.php
 <?php

/**
 * Hoa
 *
 *
 * @license
 *
 * New BSD License
 *
 * Copyright © 2007-2017, Hoa community. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Hoa nor the names of its contributors may be
 *       used to endorse or promote products derived from this software without
 *       specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

namespace Psy\Readline\Hoa;

/**
 * Root of the `hoa://` protocol.
 */
class Protocol extends ProtocolNode
{
    /**
     * No resolution value.
     *
     * @const string
     */
    const NO_RESOLUTION = '/hoa/flatland';

    /**
     * Singleton.
     */
    private static $_instance = null;

    /**
     * Cache of resolver.
     */
    private static $_cache = [];

    /**
     * Initialize the protocol.
     */
    public function __construct()
    {
        $this->initialize();

        return;
    }

    /**
     * Singleton.
     * To use the `hoa://` protocol shared by everyone.
     */
    public static function getInstance(): self
    {
        if (null === static::$_instance) {
            static::$_instance = new self();
        }

        return static::$_instance;
    }

    /**
     * Initialize the protocol.
     */
    protected function initialize()
    {
        $root = \dirname(__DIR__, 3);
        $argv0 = isset($_SERVER['argv'][0]) ? \realpath($_SERVER['argv'][0]) : false;

        $cwd =
            'cli' === \PHP_SAPI
                ? false !== $argv0 ? \dirname($argv0) : ''
                : \getcwd();

        $this[] = new ProtocolNode(
            'Application',
            $cwd.\DIRECTORY_SEPARATOR,
            [
                new ProtocolNode('Public', 'Public'.\DIRECTORY_SEPARATOR),
            ]
        );

        $this[] = new ProtocolNode(
            'Data',
            \dirname($cwd).\DIRECTORY_SEPARATOR,
            [
                new ProtocolNode(
                    'Etc',
                    'Etc'.\DIRECTORY_SEPARATOR,
                    [
                        new ProtocolNode('Configuration', 'Configuration'.\DIRECTORY_SEPARATOR),
                        new ProtocolNode('Locale', 'Locale'.\DIRECTORY_SEPARATOR),
                    ]
                ),
                new ProtocolNode('Lost+found', 'Lost+found'.\DIRECTORY_SEPARATOR),
                new ProtocolNode('Temporary', 'Temporary'.\DIRECTORY_SEPARATOR),
                new ProtocolNode(
                    'Variable',
                    'Variable'.\DIRECTORY_SEPARATOR,
                    [
                        new ProtocolNode('Cache', 'Cache'.\DIRECTORY_SEPARATOR),
                        new ProtocolNode('Database', 'Database'.\DIRECTORY_SEPARATOR),
                        new ProtocolNode('Log', 'Log'.\DIRECTORY_SEPARATOR),
                        new ProtocolNode('Private', 'Private'.\DIRECTORY_SEPARATOR),
                        new ProtocolNode('Run', 'Run'.\DIRECTORY_SEPARATOR),
                        new ProtocolNode('Test', 'Test'.\DIRECTORY_SEPARATOR),
                    ]
                ),
            ]
        );

        $this[] = new ProtocolNodeLibrary(
            'Library',
            $root.\DIRECTORY_SEPARATOR.'Hoathis'.\DIRECTORY_SEPARATOR.';'.
            $root.\DIRECTORY_SEPARATOR.'Hoa'.\DIRECTORY_SEPARATOR
        );
    }

    /**
     * Resolve (unfold) an `hoa://` path to its real resource.
     *
     * If `$exists` is set to `true`, try to find the first that exists,
     * otherwise returns the first solution.  If `$unfold` is set to `true`,
     * it returns all the paths.
     */
    public function resolve(string $path, bool $exists = true, bool $unfold = false)
    {
        if (\substr($path, 0, 6) !== 'hoa://') {
            if (true === \is_dir($path)) {
                $path = \rtrim($path, '/\\');

                if ('' === $path) {
                    $path = '/';
                }
            }

            return $path;
        }

        if (isset(self::$_cache[$path])) {
            $handle = self::$_cache[$path];
        } else {
            $out = $this->_resolve($path, $handle);

            // Not a path but a resource.
            if (!\is_array($handle)) {
                return $out;
            }

            $handle = \array_values(\array_unique($handle, \SORT_REGULAR));

            foreach ($handle as &$entry) {
                if (true === \is_dir($entry)) {
                    $entry = \rtrim($entry, '/\\');

                    if ('' === $entry) {
                        $entry = '/';
                    }
                }
            }

            self::$_cache[$path] = $handle;
        }

        if (true === $unfold) {
            if (true !== $exists) {
                return $handle;
            }

            $out = [];

            foreach ($handle as $solution) {
                if (\file_exists($solution)) {
                    $out[] = $solution;
                }
            }

            return $out;
        }

        if (true !== $exists) {
            return $handle[0];
        }

        foreach ($handle as $solution) {
            if (\file_exists($solution)) {
                return $solution;
            }
        }

        return static::NO_RESOLUTION;
    }

    /**
     * Clear the cache.
     */
    public static function clearCache()
    {
        self::$_cache = [];
    }
}
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