VarDumper::__construct() - Code Metrics - Inspection of "Cleanup" - yiisoft/var-dumper - Measure and Improve Code Quality continuously with Scrutinizer

Passed
Pull Request — master (#34)

by Evgeniy
created 2021-01-22 20:25 UTC
VarDumper::__construct() A

↳ Parent: VarDumper
Complexity

Conditions	1
Paths	1
Size

Total Lines	3
Code Lines	1
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	2
CRAP Score	1
Importance

Changes
Metric	Value
cc	1
eloc	1
nc	1
nop	1
dl	0
loc	3
ccs	2
cts	2
cp	1
crap	1
rs	10
c	0
b	0
f	0
<?php

declare(strict_types=1);

namespace Yiisoft\VarDumper;

use Closure;
use Exception;
use IteratorAggregate;
use Yiisoft\Arrays\ArrayableInterface;
use function get_class;
use function in_array;
use function is_array;
use function is_object;

/**
 * VarDumper provides enhanced versions of the PHP functions {@see var_dump()}, {@see print_r()} and {@see json_encode()}.
 * It can:
 *
 * - Correctly identify the recursively referenced objects in a complex object structure.
 * - Recursively control depth to avoid indefinite recursive display of some peculiar variables.
 * - Export closures and objects.
 * - Highlight output.
 * - Format output.
 */
final class VarDumper
{
    /**
     * @var mixed Variable to dump.
     */
    private $variable;
    private array $objects = [];

    private static ?ClosureExporter $closureExporter = null;

    /**
     * @param mixed $variable Variable to dump.
     */
    private function __construct($variable)
    {
        $this->variable = $variable;
    }

    /**
     * @param mixed $variable Variable to dump.
     *
     * @return static An instance containing variable to dump.
     */
    public static function create($variable): self
    {
        return new self($variable);
    }

    /**
     * Displays a variable.
     *
     * This method achieves the similar functionality as {@see var_dump()} and {@see print_r()}
     * but is more robust when handling complex objects.
     *
     * @param mixed $variable Variable to be dumped.
     * @param int $depth Maximum depth that the dumper should go into the variable. Defaults to 10.
     * @param bool $highlight Whether the result should be syntax-highlighted.
     */
    public static function dump($variable, int $depth = 10, bool $highlight = true): void
    {
        echo self::create($variable)->asString($depth, $highlight);
    }

    /**
     * Dumps a variable in terms of a string.
     *
     * This method achieves the similar functionality as {@see var_dump()} and {@see print_r()}
     * but is more robust when handling complex objects.
     *
     * @param int $depth Maximum depth that the dumper should go into the variable. Defaults to 10.
     * @param bool $highlight Whether the result should be syntax-highlighted.
     *
     * @return string The string representation of the variable.
     */
    public function asString(int $depth = 10, bool $highlight = false): string
    {
        $output = $this->dumpInternal($this->variable, true, $depth, 0);
        if ($highlight) {
            $result = highlight_string("<?php\n" . $output, true);
            $output = preg_replace('/&lt;\\?php<br \\/>/', '', $result, 1);
        }

        return $output;
    }

    private function dumpNested($variable, int $depth, int $objectCollapseLevel)
    {
        $this->buildObjectsCache($variable, $depth);
        return $this->dumpNestedInternal($variable, $depth, 0, $objectCollapseLevel);
    }

    /**
     * Export variable as JSON.
     *
     * @param int $depth Maximum depth that the dumper should go into the variable.
     * @param bool $format Whatever to format exported code.
     *
     * @return string JSON string.
     */
    public function asJson(int $depth = 50, bool $format = false): string
    {
        return $this->asJsonInternal($this->variable, $format, $depth, 0);
    }

    /**
     * Export variable as JSON summary of topmost items.
     *
     * @param int $depth Maximum depth that the dumper should go into the variable.
     * @param bool $prettyPrint Whatever to format exported code.
     *
     * @return string JSON string containing summary.
     */
    public function asJsonObjectsMap(int $depth = 50, bool $prettyPrint = false): string
    {
        $this->buildObjectsCache($this->variable, $depth);

        return $this->asJsonInternal($this->objects, $prettyPrint, $depth, 1);
    }

    /**
     * Exports a variable as a string containing PHP code.
     *
     * The string is a valid PHP expression that can be evaluated by PHP parser
     * and the evaluation result will give back the variable value.
     *
     * This method is similar to {@see var_export()}. The main difference is that
     * it generates more compact string representation using short array syntax.
     *
     * It also handles closures with {@see ClosureExporter} and objects
     * by using the PHP functions {@see serialize()} and {@see unserialize()}.
     *
     * @param bool $format Whatever to format code.
     *
     * @throws \ReflectionException
     *
     * @return string A PHP code representation of the variable.
     */
    public function export(bool $format = true): string
    {
        return $this->exportInternal($this->variable, $format, 0);
    }

    private function buildObjectsCache($variable, int $depth, int $level = 0): void
    {
        if ($depth <= $level) {
            return;
        }
        if (is_object($variable)) {
            if (in_array($variable, $this->objects, true)) {
                return;
            }
            $this->objects[] = $variable;
            $variable = $this->getObjectProperties($variable);
        }
        if (is_array($variable)) {
            foreach ($variable as $value) {
                $this->buildObjectsCache($value, $depth, $level + 1);
            }
        }
    }

    private function dumpNestedInternal($var, int $depth, int $level, int $objectCollapseLevel = 0)
    {
        $output = $var;

        switch (gettype($var)) {
            case 'array':
                if ($depth <= $level) {
                    return 'array [...]';
                }

                $output = [];
                foreach ($var as $key => $value) {
                    $keyDisplay = str_replace("\0", '::', trim((string)$key));
                    $output[$keyDisplay] = $this->dumpNestedInternal($value, $depth, $level + 1, $objectCollapseLevel);
                }

                break;
            case 'object':
                $objectDescription = $this->getObjectDescription($var);
                if ($depth <= $level) {
                    $output = $objectDescription . ' (...)';
                    break;
                }

                if ($var instanceof Closure) {
                    $output = [$objectDescription => $this->exportClosure($var)];
                    break;
                }

                if ($objectCollapseLevel < $level && in_array($var, $this->objects, true)) {
                    $output = 'object@' . $objectDescription;
                    break;
                }

                $output = [];
                $properties = $this->getObjectProperties($var);
                if (empty($properties)) {
                    $output[$objectDescription] = '{stateless object}';
                    break;
                }
                foreach ($properties as $key => $value) {
                    $keyDisplay = $this->normalizeProperty((string) $key);
                    /**
                     * @psalm-suppress InvalidArrayOffset
                     */
                    $output[$objectDescription][$keyDisplay] = $this->dumpNestedInternal(
                        $value,
                        $depth,
                        $level + 1,
                        $objectCollapseLevel
                    );
                }

                break;
            case 'resource':
            case 'resource (closed)':
                $output = $this->getResourceDescription($var);
                break;
        }

        return $output;
    }

    private function normalizeProperty(string $property): string
    {
        $property = str_replace("\0", '::', trim($property));

        if (strpos($property, '*::') === 0) {
            return 'protected $' . substr($property, 3);
        }

        if (($pos = strpos($property, '::')) !== false) {
            return 'private $' . substr($property, $pos + 2);
        }

        return 'public $' . $property;
    }

    /**
     * @param mixed $var Variable to be dumped.
     * @param bool $format Whatever to format code.
     * @param int $depth Maximum depth.
     * @param int $level Current depth.
     *
     * @throws \ReflectionException
     *
     * @return string
     */
    private function dumpInternal($var, bool $format, int $depth, int $level): string
    {
        $type = gettype($var);
        switch ($type) {
            case 'resource':
            case 'resource (closed)':
                return '{resource}';
            case 'NULL':
                return 'null';
            case 'array':
                if ($depth <= $level) {
                    return '[...]';
                }

                if (empty($var)) {
                    return '[]';
                }

                $output = '';
                $keys = array_keys($var);
                $spaces = str_repeat(' ', $level * 4);
                $output .= '[';
                foreach ($keys as $name) {
                    if ($format) {
                        $output .= "\n" . $spaces . '    ';
                    }
                    $output .= $this->exportVariable($name);
                    $output .= ' => ';
                    $output .= $this->dumpInternal($var[$name], $format, $depth, $level + 1);
                }

                return $format
                    ? $output . "\n" . $spaces . ']'
                    : $output . ']';
            case 'object':
                if ($var instanceof Closure) {
                    return $this->exportClosure($var);
                }
                if ($depth <= $level) {
                    return $this->getObjectDescription($var) . ' (...)';
                }

                $this->objects[] = $var;
                $spaces = str_repeat(' ', $level * 4);
                $output = $this->getObjectDescription($var) . "\n" . $spaces . '(';
                $objectProperties = $this->getObjectProperties($var);
                foreach ($objectProperties as $name => $value) {
                    $propertyName = strtr(trim((string) $name), "\0", '::');
                    $output .= "\n" . $spaces . "    [$propertyName] => ";
                    $output .= $this->dumpInternal($value, $format, $depth, $level + 1);
                }
                return $output . "\n" . $spaces . ')';
            default:
                return $this->exportVariable($var);
        }
    }

    private function getObjectProperties($var): array
    {
        if ('__PHP_Incomplete_Class' !== get_class($var) && method_exists($var, '__debugInfo')) {
            $var = $var->__debugInfo();
        }

        return (array)$var;
    }

    private function getResourceDescription($resource)
    {
        $type = get_resource_type($resource);
        if ($type === 'stream') {
            $desc = stream_get_meta_data($resource);
        } else {
            $desc = '{resource}';
        }

        return $desc;
    }

    /**
     * @param mixed $variable Variable to be exported.
     * @param bool $format Whatever to format code.
     * @param int $level Current depth.
     *
     * @throws \ReflectionException
     *
     * @return string
     */
    private function exportInternal($variable, bool $format, int $level): string
    {
        switch (gettype($variable)) {
            case 'NULL':
                return 'null';
            case 'array':
                if (empty($variable)) {
                    return '[]';
                }

                $keys = array_keys($variable);
                $outputKeys = ($keys !== range(0, count($variable) - 1));
                $spaces = str_repeat(' ', $level * 4);
                $output = '[';
                foreach ($keys as $key) {
                    if ($format) {
                        $output .= "\n" . $spaces . '    ';
                    }
                    if ($outputKeys) {
                        $output .= $this->exportVariable($key);
                        $output .= ' => ';
                    }
                    $output .= $this->exportInternal($variable[$key], $format, $level + 1);
                    if ($format || next($keys) !== false) {
                        $output .= ',';
                    }
                }
                return $format
                    ? $output . "\n" . $spaces . ']'
                    : $output . ']';
            case 'object':
                if ($variable instanceof Closure) {
                    return $this->exportClosure($variable);
                }

                try {
                    return 'unserialize(' . $this->exportVariable(serialize($variable)) . ')';
                } catch (Exception $e) {
                    // Serialize may fail, for example: if object contains a `\Closure` instance
                    // so we use a fallback.
                    if ($variable instanceof ArrayableInterface) {
                        return $this->exportInternal($variable->toArray(), $format, $level);
                    }

                    if ($variable instanceof IteratorAggregate) {
                        return $this->exportInternal(iterator_to_array($variable), $format, $level);
                    }

                    if ('__PHP_Incomplete_Class' !== get_class($variable) && method_exists($variable, '__toString')) {
                        return $this->exportVariable($variable->__toString());
                    }

                    return $this->exportVariable(self::create($variable)->asString());
                }
            default:
                return $this->exportVariable($variable);
        }
    }

    /**
     * Exports a {@see \Closure} instance.
     *
     * @param Closure $closure Closure instance.
     *
     * @throws \ReflectionException
     *
     * @return string
     */
    private function exportClosure(Closure $closure): string
    {
        if (self::$closureExporter === null) {
            self::$closureExporter = new ClosureExporter();
        }

        return self::$closureExporter->export($closure);
        return self::$closureExporter->/** @scrutinizer ignore-call */ export($closure);
    }

    private function getObjectDescription(object $object): string
    {
        return get_class($object) . '#' . spl_object_id($object);
    }

    private function exportVariable($variable): string
    {
        return var_export($variable, true);
    }

    private function asJsonInternal($variable, bool $format, int $depth, int $objectCollapseLevel)
    {
        $options = JSON_THROW_ON_ERROR | JSON_UNESCAPED_UNICODE | JSON_INVALID_UTF8_SUBSTITUTE;

        if ($format) {
            $options |= JSON_PRETTY_PRINT;
        }

        return json_encode($this->dumpNested($variable, $depth, $objectCollapseLevel), $options);
    }
}

yiisoft / var-dumper

Pull Request — master (#34)

VarDumper::__construct() A

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