Rector - Upgrade your Legacy App to Modern Codebase

Rector is a reconstructor tool - it does instant upgrades and instant refactoring of your code. Why doing it manually if 80% Rector can handle for you?

Open-Source First

Rector instantly upgrades and instantly refactors PHP code of your application. It covers many open-source projects and PHP changes itself:

What can Rector do for You?

Rename classes, methods, properties, namespaces or constants
Complete parameter, var or return type declarations based on static analysis of your code
Upgrade your code from PHP 5.3 to PHP 7.4
Migrate your project from Nette to Symfony
Complete PHP 7.4 property type declarations
Turn Laravel static to Dependency Injection
And much more...

...look at overview of all available Rectors with before/after diffs and configuration examples. You can use them to build your own sets.

How to Apply Coding Standards?

AST libraries that Rector use, doesn't work well with coding standards, so it's better to let coding standard tools do that.

Your project doesn't have one? Consider adding EasyCodingStandard, PHP CS Fixer or PHP_CodeSniffer.

Install

composer require rector/rector --dev

Do you have conflicts on composer require or on run?

use Docker image or
install prefixed version with isolated dependencies (currently looking for maintainer)

Extra Autoloading

Rector relies on project and autoloading of its classes. To specify own autoload file, use --autoload-file option:

vendor/bin/rector process ../project --autoload-file ../project/vendor/autoload.php

Or make use of rector.yaml config:

# rector.yaml
parameters:
    autoload_paths:
        - 'vendor/squizlabs/php_codesniffer/autoload.php'
        - 'vendor/project-without-composer'

Exclude Paths and Rectors

You can also exclude files or directories (with regex or fnmatch):

# rector.yaml
parameters:
    exclude_paths:
        - '*/src/*/Tests/*'

Do you want to use whole set, except that one rule? Exclude it:

# rector.yaml
parameters:
    exclude_rectors:
        - 'Rector\CodeQuality\Rector\If_\SimplifyIfReturnBoolRector'

By default Rector uses language features of your PHP version. If you you want to use different PHP version than your system, put it in config:

parameters:
    php_version_features: '7.2' # your version 7.3

Running Rector

A. Prepared Sets

Featured open-source projects have prepared sets. You'll find them in /config/set or by calling:

vendor/bin/rector levels

Let's say you pick symfony40 level and you want to upgrade your /src directory:

# show known changes in Symfony 4.0
vendor/bin/rector process src --level symfony40 --dry-run

# apply
vendor/bin/rector process src --level symfony40

B. Custom Sets

Create rector.yaml with desired Rectors:

services:
    Rector\Rector\Architecture\DependencyInjection\AnnotatedPropertyInjectToConstructorInjectionRector:
        $annotation: "inject"

Run on your /src directory:

vendor/bin/rector process src --dry-run
# apply
vendor/bin/rector process src

3 Steps to Create Own Rector

First, make sure it's not covered by any existing Rectors yet.

Let's say we want to change method calls from set* to change*.

 $user = new User();
-$user->setPassword('123456');
+$user->changePassword('123456');

1. Create New Rector and Implement Methods

Create class that extends Rector\Rector\AbstractRector. It has useful methods like checking node type and name. Just run $this-> and let PHPStorm show you all possible methods.

<?php declare(strict_types=1);

namespace App\Rector;

use Nette\Utils\Strings;
use PhpParser\Node;
use PhpParser\Node\Identifier;
use PhpParser\Node\Expr\MethodCall;
use Rector\Rector\AbstractRector;
use Rector\RectorDefinition\CodeSample;
use Rector\RectorDefinition\RectorDefinition;

final class MyFirstRector extends AbstractRector
{
    public function getDefinition(): RectorDefinition
    {
        // what does this do?
        // minimalistic before/after sample - to explain in code
        return new RectorDefinition('Change method calls from set* to change*.', [
            new CodeSample('$user->setPassword("123456");', '$user->changePassword("123456");')
        ]);
    }

    /**
     * @return string[]
     */
    public function getNodeTypes(): array
    {
        // what node types we look for?
        // pick any node from https://github.com/rectorphp/rector/blob/master/docs/NodesOverview.md
        return [MethodCall::class];
    }

    /**
     * @param MethodCall $node - we can add "MethodCall" type here, because only this node is in "getNodeTypes()"
     */
    public function refactor(Node $node): ?Node
    {
        // we only care about "set*" method names
        if (! $this->isName($node, 'set*')) {
            // return null to skip it
            return null;
        }

        $methodCallName = $this->getName($node);
        $newMethodCallName = Strings::replace($methodCallName, '#^set#', 'change');

        $node->name = new Identifier($newMethodCallName);

        // return $node if you modified it
        return $node;
    }
}

2. Register it

# rector.yaml
services:
    App\Rector\MyFirstRector: ~

3. Let Rector Refactor Your Code

# see the diff first
vendor/bin/rector process src --dry-run

# if it's ok, apply
vendor/bin/rector process src

That's it!

How to Contribute

Just follow 3 rules:

1 feature per pull-request
New feature needs tests
Tests, coding standards and PHPStan checks must pass:
```
composer complete-check
```
Don you need to fix coding standards? Run:
```
composer fix-cs
```

We would be happy to merge your feature then.

Run Rector in Docker

With this command, you can process your project with rector from docker:

docker run -v $(pwd):/project rector/rector:latest process /project/src --level symfony40 --dry-run

# Note that a volume is mounted from `pwd` into `/project` which can be accessed later.

Using rector.yaml:

docker run -v $(pwd):/project rector/rector:latest process /project/app --config /project/rector.yaml --autoload-file /project/vendor/autoload.php --dry-run

Community Packages

Do you use Rector to upgrade your code? Share it here:

drupal8-rector/drupal8-rector by @mxr576

ftassi/rector