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<?php declare(strict_types=1);

/*

 * This file is part of sebastian/exporter.

 *

 * (c) Sebastian Bergmann <sebastian@phpunit.de>

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace SebastianBergmann\Exporter;

use function bin2hex;

use function count;

use function function_exists;

use function get_class;

use function get_resource_type;

use function gettype;

use function implode;

use function ini_get;

use function ini_set;

use function is_array;

use function is_float;

use function is_object;

use function is_resource;

use function is_string;

use function mb_strlen;

use function mb_substr;

use function preg_match;

use function spl_object_hash;

use function sprintf;

use function str_repeat;

use function str_replace;

use function strlen;

use function substr;

use function var_export;

use SebastianBergmann\RecursionContext\Context;

use SplObjectStorage;

/**

 * A nifty utility for visualizing PHP variables.

 *

 * <code>

 * <?php

 * use SebastianBergmann\Exporter\Exporter;

 *

 * $exporter = new Exporter;

 * print $exporter->export(new Exception);

 * </code>

 */

class Exporter

{

    /**

     * Exports a value as a string.

     *

     * The output of this method is similar to the output of print_r(), but

     * improved in various aspects:

     *

     *  - NULL is rendered as "null" (instead of "")

     *  - TRUE is rendered as "true" (instead of "1")

     *  - FALSE is rendered as "false" (instead of "")

     *  - Strings are always quoted with single quotes

     *  - Carriage returns and newlines are normalized to \n

     *  - Recursion and repeated rendering is treated properly

     *

     * @param int $indentation The indentation level of the 2nd+ line

     *

     * @return string

     */

    public function export($value, $indentation = 0)

    {

        return $this->recursiveExport($value, $indentation);

    }

    /**

     * @param array<mixed> $data

     * @param Context      $context

     *

     * @return string

     */

    public function shortenedRecursiveExport(&$data, Context $context = null)

    {

        $result   = [];

        $exporter = new self();

        if (!$context) {

            $context = new Context;

        }

        $array = $data;

        $context->add($data);

        foreach ($array as $key => $value) {

            if (is_array($value)) {

                if ($context->contains($data[$key]) !== false) {

                    $result[] = '*RECURSION*';

                } else {

                    $result[] = sprintf(

                        'array(%s)',

                        $this->shortenedRecursiveExport($data[$key], $context)

                    );

                }

            } else {

                $result[] = $exporter->shortenedExport($value);

            }

        }

        return implode(', ', $result);

    }

    /**

     * Exports a value into a single-line string.

     *

     * The output of this method is similar to the output of

     * SebastianBergmann\Exporter\Exporter::export().

     *

     * Newlines are replaced by the visible string '\n'.

     * Contents of arrays and objects (if any) are replaced by '...'.

     *

     * @return string

     *

     * @see    SebastianBergmann\Exporter\Exporter::export

     */

    public function shortenedExport($value)

    {

        if (is_string($value)) {

            $string = str_replace("\n", '', $this->export($value));

            if (function_exists('mb_strlen')) {

                if (mb_strlen($string) > 40) {

                    $string = mb_substr($string, 0, 30) . '...' . mb_substr($string, -7);

                }

            } else {

                if (strlen($string) > 40) {

                    $string = substr($string, 0, 30) . '...' . substr($string, -7);

                }

            }

            return $string;

        }

        if (is_object($value)) {

            return sprintf(

                '%s Object (%s)',

                get_class($value),

                count($this->toArray($value)) > 0 ? '...' : ''

            );

        }

        if (is_array($value)) {

            return sprintf(

                'Array (%s)',

                count($value) > 0 ? '...' : ''

            );

        }

        return $this->export($value);

    }

    /**

     * Converts an object to an array containing all of its private, protected

     * and public properties.

     *

     * @return array

     */

    public function toArray($value)

    {

        if (!is_object($value)) {

            return (array) $value;

        }

        $array = [];

        foreach ((array) $value as $key => $val) {

            // Exception traces commonly reference hundreds to thousands of

            // objects currently loaded in memory. Including them in the result

            // has a severe negative performance impact.

            if ("\0Error\0trace" === $key || "\0Exception\0trace" === $key) {

                continue;

            }

            // properties are transformed to keys in the following way:

            // private   $property => "\0Classname\0property"

            // protected $property => "\0*\0property"

            // public    $property => "property"

            if (preg_match('/^\0.+\0(.+)$/', (string) $key, $matches)) {

                $key = $matches[1];

            }

            // See https://github.com/php/php-src/commit/5721132

            if ($key === "\0gcdata") {

                continue;

            }

            $array[$key] = $val;

        }

        // Some internal classes like SplObjectStorage don't work with the

        // above (fast) mechanism nor with reflection in Zend.

        // Format the output similarly to print_r() in this case

        if ($value instanceof SplObjectStorage) {

            foreach ($value as $key => $val) {

                $array[spl_object_hash($val)] = [

                    'obj' => $val,

                    'inf' => $value->getInfo(),

                ];

            }

        }

        return $array;

    }

    /**

     * Recursive implementation of export.

     *

     * @param mixed                                       $value       The value to export

     * @param int                                         $indentation The indentation level of the 2nd+ line

     * @param \SebastianBergmann\RecursionContext\Context $processed   Previously processed objects

     *

     * @return string

     *

     * @see    SebastianBergmann\Exporter\Exporter::export

     */

    protected function recursiveExport(&$value, $indentation, $processed = null)

    {

        if ($value === null) {

            return 'null';

        }

        if ($value === true) {

            return 'true';

        }

        if ($value === false) {

            return 'false';

        }

        if (is_float($value)) {

            $precisionBackup = ini_get('precision');

            ini_set('precision', '-1');

            try {

                $valueStr = (string) $value;

                if ((string) (int) $value === $valueStr) {

                    return $valueStr . '.0';

                }

                return $valueStr;

            } finally {

                ini_set('precision', $precisionBackup);

            }

        }

        if (gettype($value) === 'resource (closed)') {

            return 'resource (closed)';

        }

        if (is_resource($value)) {

            return sprintf(

                'resource(%d) of type (%s)',

                $value,

                get_resource_type($value)

            );

        }

        if (is_string($value)) {

            // Match for most non printable chars somewhat taking multibyte chars into account

            if (preg_match('/[^\x09-\x0d\x1b\x20-\xff]/', $value)) {

                return 'Binary String: 0x' . bin2hex($value);

            }

            return "'" .

            str_replace(

                '<lf>',

                "\n",

                str_replace(

                    ["\r\n", "\n\r", "\r", "\n"],

                    ['\r\n<lf>', '\n\r<lf>', '\r<lf>', '\n<lf>'],

                    $value

                )

            ) .

            "'";

        }

        $whitespace = str_repeat(' ', 4 * $indentation);

        if (!$processed) {

            $processed = new Context;

        }

        if (is_array($value)) {

            if (($key = $processed->contains($value)) !== false) {

                return 'Array &' . $key;

            }

            $array  = $value;

            $key    = $processed->add($value);

            $values = '';

            if (count($array) > 0) {

                foreach ($array as $k => $v) {

                    $values .= sprintf(

                        '%s    %s => %s' . "\n",

                        $whitespace,

                        $this->recursiveExport($k, $indentation),

                        $this->recursiveExport($value[$k], $indentation + 1, $processed)

                    );

                }

                $values = "\n" . $values . $whitespace;

            }

            return sprintf('Array &%s (%s)', $key, $values);

        }

        if (is_object($value)) {

            $class = get_class($value);

            if ($hash = $processed->contains($value)) {

                return sprintf('%s Object &%s', $class, $hash);

            }

            $hash   = $processed->add($value);

            $values = '';

            $array  = $this->toArray($value);

            if (count($array) > 0) {

                foreach ($array as $k => $v) {

                    $values .= sprintf(

                        '%s    %s => %s' . "\n",

                        $whitespace,

                        $this->recursiveExport($k, $indentation),

                        $this->recursiveExport($v, $indentation + 1, $processed)

                    );

                }

                $values = "\n" . $values . $whitespace;

            }

            return sprintf('%s Object &%s (%s)', $class, $hash, $values);

        }

        return var_export($value, true);

    }

}