Read.php

<?php

declare(strict_types=1);

/**
 * 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 Hoa\File\Link;

use Hoa\File;
use Hoa\Stream;

/**
 * Class \Hoa\File\Link\Read.
 *
 * File handler.
 *
 * @license    New BSD License
 */
class Read extends Link implements Stream\IStream\In
{
    /**
     * Open a file.
     *
     * @param   string  $streamName    Stream name.
     * @param   string  $mode          Open mode, see the parent::MODE_* constants.
     * @param   string  $context       Context ID (please, see the
     *                                 \Hoa\Stream\Context class).
     * @param   bool    $wait          Differ opening or not.
     */
    public function __construct(
        string $streamName,
        string $mode    = parent::MODE_READ,
        string $context = null,
        bool $wait    = false
    ) {
        parent::__construct($streamName, $mode, $context, $wait);

        return;
    }

    /**
     * Open the stream and return the associated resource.
     *
     * @param   string               $streamName    Stream name (e.g. path or URL).
     * @param   \Hoa\Stream\Context  $context       Context.
     * @return  resource
     * @throws  \Hoa\File\Exception\FileDoesNotExist
     * @throws  \Hoa\File\Exception
     */
    protected function &_open(string $streamName, Stream\Context $context = null): resource
    {
        static $createModes = [
            parent::MODE_READ
        ];

        if (!in_array($this->getMode(), $createModes)) {
            throw new File\Exception(
                'Open mode are not supported; given %d. Only %s are supported.',
                0,
                [$this->getMode(), implode(', ', $createModes)]
            );
        }

        preg_match('#^(\w+)://#', $streamName, $match);

        if (((isset($match[1]) && $match[1] == 'file') || !isset($match[1])) &&
            !file_exists($streamName)) {
            throw new File\Exception\FileDoesNotExist(
                'File %s does not exist.',
                1,
                $streamName
            );
        }

        $out = parent::_open($streamName, $context);

        return $out;
    }

    /**
     * Test for end-of-file.
     *
     * @return  bool
     */
    public function eof(): bool
    {
        return feof($this->getStream());
    }

    /**
     * Read n characters.
     *
     * @param   int     $length    Length.
     * @return  string
     * @throws  \Hoa\File\Exception
     */
    public function read(int $length)
    {
        if (0 > $length) {
            throw new File\Exception(
                'Length must be greater than 0, given %d.',
                2,
                $length
            );
        }

        return fread($this->getStream(), $length);
    }

    /**
     * Alias of $this->read().
     *
     * @param   int     $length    Length.
     * @return  string
     */
    public function readString(int $length)
    {
        return $this->read($length);
    }

    /**
     * Read a character.
     *
     * @return  string
     */
    public function readCharacter()
    {
        return fgetc($this->getStream());
    }

    /**
     * Read a boolean.
     *
     * @return  bool
     */
    public function readBoolean()
    {
        return (bool) $this->read(1);
    }

    /**
     * Read an integer.
     *
     * @param   int     $length    Length.
     * @return  int
     */
    public function readInteger(int $length = 1)
    {
        return (int) $this->read($length);
    }

    /**
     * Read a float.
     *
     * @param   int     $length    Length.
     * @return  float
     */
    public function readFloat(int $length = 1)
    {
        return (float) $this->read($length);
    }

    /**
     * Read an array.
     * Alias of the $this->scanf() method.
     *
     * @param   string  $format    Format (see printf's formats).
     * @return  array
     */
    public function readArray(string $format = null)
    {
        return $this->scanf($format);
    }

    /**
     * Read a line.
     *
     * @return  string
     */
    public function readLine()
    {
        return fgets($this->getStream());
    }

    /**
     * Read all, i.e. read as much as possible.
     *
     * @param   int  $offset    Offset.
     * @return  string
     */
    public function readAll(int $offset = 0)
    {
        return stream_get_contents($this->getStream(), -1, $offset);
    }

    /**
     * Parse input from a stream according to a format.
     *
     * @param   string  $format    Format (see printf's formats).
     * @return  array
     */
    public function scanf(string $format): array
    {
        return fscanf($this->getStream(), $format);
    }
}