579 lines
12 KiB
Markdown
579 lines
12 KiB
Markdown
Nette PHP Generator
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===================
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[](https://packagist.org/packages/nette/php-generator)
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[](https://travis-ci.org/nette/php-generator)
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[](https://coveralls.io/github/nette/php-generator?branch=master)
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[](https://github.com/nette/php-generator/releases)
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[](https://github.com/nette/php-generator/blob/master/license.md)
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Introduction
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------------
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Generate PHP code, classes, namespaces etc. with a simple programmatical API.
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Documentation can be found on the [website](https://doc.nette.org/php-generator).
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If you like Nette, **[please make a donation now](https://nette.org/donate)**. Thank you!
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Installation
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------------
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The recommended way to install is via Composer:
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```
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composer require nette/php-generator
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```
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- PhpGenerator 3.2 – 3.4 is compatible with PHP 7.1 to 7.4
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- PhpGenerator 3.1 is compatible with PHP 7.1 to 7.3
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- PhpGenerator 3.0 is compatible with PHP 7.0 to 7.3
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- PhpGenerator 2.6 is compatible with PHP 5.6 to 7.3
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Usage
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-----
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Usage is very easy. Let's start with a straightforward example of generating class:
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```php
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$class = new Nette\PhpGenerator\ClassType('Demo');
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$class
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->setFinal()
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->setExtends(ParentClass::class)
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->addImplement(Countable::class)
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->addTrait(Nette\SmartObject::class)
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->addComment("Description of class.\nSecond line\n")
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->addComment('@property-read Nette\Forms\Form $form');
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// to generate PHP code simply cast to string or use echo:
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echo $class;
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// or use printer:
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$printer = new Nette\PhpGenerator\Printer;
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echo $printer->printClass($class);
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```
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It will render this result:
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```php
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/**
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* Description of class.
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* Second line
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*
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* @property-read Nette\Forms\Form $form
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*/
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final class Demo extends ParentClass implements Countable
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{
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use Nette\SmartObject;
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}
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```
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We can add constants and properties:
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```php
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$class->addConstant('ID', 123);
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$class->addProperty('items', [1, 2, 3])
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->setPrivate()
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->setStatic()
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->addComment('@var int[]');
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```
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It generates:
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```php
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const ID = 123;
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/** @var int[] */
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private static $items = [1, 2, 3];
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```
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And we can add methods with parameters:
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```php
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$method = $class->addMethod('count')
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->addComment('Count it.')
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->addComment('@return int')
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->setFinal()
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->setProtected()
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->setBody('return count($items ?: $this->items);');
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$method->addParameter('items', []) // $items = []
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->setReference() // &$items = []
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->setType('array'); // array &$items = []
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```
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It results in:
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```php
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/**
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* Count it.
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* @return int
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*/
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final protected function count(array &$items = [])
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{
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return count($items ?: $this->items);
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}
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```
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If the property, constant, method or parameter already exist, it will be overwritten.
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Members can be removed using `removeProperty()`, `removeConstant()`, `removeMethod()` or `removeParameter()`.
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PHP Generator supports all new PHP 7.3 and 7.4 features:
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```php
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use Nette\PhpGenerator\Type;
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$class = new Nette\PhpGenerator\ClassType('Demo');
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$class->addConstant('ID', 123)
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->setPrivate(); // constant visiblity
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$class->addProperty('items')
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->setType(Type::ARRAY) // typed properites
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->setNullable()
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->setInitialized();
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$method = $class->addMethod('getValue')
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->setReturnType(Type::INT) // method return type
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->setReturnNullable() // nullable return type
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->setBody('return count($this->items);');
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$method->addParameter('id')
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->setType(Type::ARRAY) // scalar type hint
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->setNullable(); // nullable type hint
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echo $class;
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```
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Result:
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```php
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class Demo
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{
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private const ID = 123;
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public ?array $items = null;
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public function getValue(?int $id): ?int
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{
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return count($this->items);
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}
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}
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```
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You can also add existing `Method`, `Property` or `Constant` objects to the class:
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```php
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$method = new Nette\PhpGenerator\Method('getHandle');
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$property = new Nette\PhpGenerator\Property('handle');
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$const = new Nette\PhpGenerator\Constant('ROLE');
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$class = (new Nette\PhpGenerator\ClassType('Demo'))
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->addMember($method)
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->addMember($property)
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->addMember($const);
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```
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You can clone existing methods, properties and constants with a different name using `cloneWithName()`:
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```php
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$methodCount = $class->getMethod('count');
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$methodRecount = $methodCount->cloneWithName('recount');
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$class->addMember($methodRecount);
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```
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Tabs versus spaces
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------------------
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The generated code uses tabs for indentation. If you want to have the output compatible with PSR-2 or PSR-12, use `PsrPrinter`:
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```php
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$class = new Nette\PhpGenerator\ClassType('Demo');
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// ...
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$printer = new Nette\PhpGenerator\PsrPrinter;
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echo $printer->printClass($class); // 4 spaces indentation
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```
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It can be used also for functions, closures, namespaces etc.
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Literals
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--------
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You can pass any PHP code to property or parameter default values via `Literal`:
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```php
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use Nette\PhpGenerator\Literal;
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$class = new Nette\PhpGenerator\ClassType('Demo');
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$class->addProperty('foo', new Literal('Iterator::SELF_FIRST'));
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$class->addMethod('bar')
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->addParameter('id', new Literal('1 + 2'));
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echo $class;
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```
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Result:
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```php
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class Demo
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{
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public $foo = Iterator::SELF_FIRST;
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public function bar($id = 1 + 2)
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{
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}
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}
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```
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Interface or Trait
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------------------
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```php
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$class = new Nette\PhpGenerator\ClassType('DemoInterface');
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$class->setInterface();
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// or $class->setTrait();
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```
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Trait Resolutions and Visibility
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--------------------------------
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```php
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$class = new Nette\PhpGenerator\ClassType('Demo');
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$class->addTrait('SmartObject', ['sayHello as protected']);
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echo $class;
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```
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Result:
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```php
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class Demo
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{
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use SmartObject {
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sayHello as protected;
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}
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}
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```
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Anonymous Class
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---------------
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```php
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$class = new Nette\PhpGenerator\ClassType(null);
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$class->addMethod('__construct')
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->addParameter('foo');
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echo '$obj = new class ($val) ' . $class . ';';
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```
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Result:
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```php
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$obj = new class ($val) {
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public function __construct($foo)
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{
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}
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};
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```
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Global Function
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---------------
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Code of function:
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```php
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$function = new Nette\PhpGenerator\GlobalFunction('foo');
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$function->setBody('return $a + $b;');
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$function->addParameter('a');
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$function->addParameter('b');
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echo $function;
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// or use PsrPrinter for output compatible with PSR-2 / PSR-12
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// echo (new Nette\PhpGenerator\PsrPrinter)->printFunction($function);
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```
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Result:
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```php
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function foo($a, $b)
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{
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return $a + $b;
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}
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```
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Closure
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-------
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Code of closure:
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```php
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$closure = new Nette\PhpGenerator\Closure;
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$closure->setBody('return $a + $b;');
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$closure->addParameter('a');
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$closure->addParameter('b');
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$closure->addUse('c')
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->setReference();
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echo $closure;
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// or use PsrPrinter for output compatible with PSR-2 / PSR-12
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// echo (new Nette\PhpGenerator\PsrPrinter)->printClosure($closure);
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```
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Result:
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```php
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function ($a, $b) use (&$c) {
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return $a + $b;
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}
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```
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Arrow function
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--------------
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You can also print closure as arrow function using printer:
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```php
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$closure = new Nette\PhpGenerator\Closure;
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$closure->setBody('return $a + $b;');
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$closure->addParameter('a');
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$closure->addParameter('b');
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// or use PsrPrinter for output compatible with PSR-2 / PSR-12
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echo (new Nette\PhpGenerator\Printer)->printArrowFunction($closure);
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```
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Result:
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```php
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fn ($a, $b) => $a + $b;
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```
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Method and Function Body Generator
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----------------------------------
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You can use special placeholders for handy way to generate method or function body.
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Simple placeholders:
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```php
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$str = 'any string';
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$num = 3;
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$function = new Nette\PhpGenerator\GlobalFunction('foo');
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$function->addBody('return strlen(?, ?);', [$str, $num]);
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echo $function;
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```
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Result:
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```php
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function foo()
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{
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return strlen('any string', 3);
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}
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```
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Variadic placeholder:
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```php
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$items = [1, 2, 3];
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$function = new Nette\PhpGenerator\GlobalFunction('foo');
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$function->setBody('myfunc(...?);', [$items]);
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echo $function;
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```
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Result:
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```php
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function foo()
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{
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myfunc(1, 2, 3);
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}
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```
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Escape placeholder using slash:
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```php
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$num = 3;
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$function = new Nette\PhpGenerator\GlobalFunction('foo');
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$function->addParameter('a');
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$function->addBody('return $a \? 10 : ?;', [$num]);
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echo $function;
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```
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Result:
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```php
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function foo($a)
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{
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return $a ? 10 : 3;
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}
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```
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Namespace
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---------
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Classes, traits and interfaces (hereinafter classes) can be grouped into namespaces:
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```php
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$namespace = new Nette\PhpGenerator\PhpNamespace('Foo');
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$class = $namespace->addClass('Task');
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$interface = $namespace->addInterface('Countable');
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$trait = $namespace->addTrait('NameAware');
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// or
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$class = new Nette\PhpGenerator\ClassType('Task');
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$namespace->add($class);
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```
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If the class already exists, it will be overwritten.
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You can define use-statements:
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```php
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$namespace->addUse(Http\Request::class); // use Http\Request;
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$namespace->addUse(Http\Request::class, 'HttpReq'); // use Http\Request as HttpReq;
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```
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**IMPORTANT NOTE:** when the class is part of the namespace, it is rendered slightly differently: all types (ie. type hints, return types, parent class name,
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implemented interfaces and used traits) are automatically *resolved* (unless you turn it off, see below).
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It means that you have to **use full class names** in definitions and they will be replaced
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with aliases (according to the use-statements) or fully qualified names in the resulting code:
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```php
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$namespace = new Nette\PhpGenerator\PhpNamespace('Foo');
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$namespace->addUse('Bar\AliasedClass');
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$class = $namespace->addClass('Demo');
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$class->addImplement('Foo\A') // it will resolve to A
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->addTrait('Bar\AliasedClass'); // it will resolve to AliasedClass
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$method = $class->addMethod('method');
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$method->addComment('@return ' . $namespace->unresolveName('Foo\D')); // in comments resolve manually
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$method->addParameter('arg')
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->setType('Bar\OtherClass'); // it will resolve to \Bar\OtherClass
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echo $namespace;
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// or use PsrPrinter for output compatible with PSR-2 / PSR-12
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// echo (new Nette\PhpGenerator\PsrPrinter)->printNamespace($namespace);
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```
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Result:
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```php
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namespace Foo;
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use Bar\AliasedClass;
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class Demo implements A
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{
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use AliasedClass;
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/**
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* @return D
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*/
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public function method(\Bar\OtherClass $arg)
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{
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}
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}
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```
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Auto-resolving can be turned off this way:
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```php
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$printer = new Nette\PhpGenerator\Printer; // or PsrPrinter
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$printer->setTypeResolving(false);
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echo $printer->printNamespace($namespace);
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```
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PHP Files
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---------
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PHP files can contains multiple classes, namespaces and comments:
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```php
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$file = new Nette\PhpGenerator\PhpFile;
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$file->addComment('This file is auto-generated.');
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$file->setStrictTypes(); // adds declare(strict_types=1)
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$namespace = $file->addNamespace('Foo');
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$class = $namespace->addClass('A');
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$class->addMethod('hello');
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echo $file;
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// or use PsrPrinter for output compatible with PSR-2 / PSR-12
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// echo (new Nette\PhpGenerator\PsrPrinter)->printFile($file);
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```
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Result:
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```php
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<?php
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/**
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* This file is auto-generated.
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*/
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declare(strict_types=1);
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namespace Foo;
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class A
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{
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public function hello()
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{
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}
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}
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```
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Generate using Reflection
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-------------------------
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Another common use case is to create class or method based on existing ones:
|
||
|
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```php
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$class = Nette\PhpGenerator\ClassType::from(PDO::class);
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$function = Nette\PhpGenerator\GlobalFunction::from('trim');
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$closure = Nette\PhpGenerator\Closure::from(
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function (stdClass $a, $b = null) {}
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);
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```
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Method bodies are empty by default. If you want to load them as well, use this way
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(it requires `nikic/php-parser` to be installed):
|
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|
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```php
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$class = Nette\PhpGenerator\ClassType::withBodiesFrom(MyClass::class);
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$function = Nette\PhpGenerator\GlobalFunction::withBodyFrom('dump');
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```
|
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|
||
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||
Variables dumper
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||
----------------
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||
The Dumper returns a parsable PHP string representation of a variable. It provides a better function that you can use instead of `var_export()`
|
||
with more readable output.
|
||
|
||
```php
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||
$dumper = new Nette\PhpGenerator\Dumper;
|
||
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||
$var = ['a', 'b', 123];
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||
echo $dumper->dump($var); // prints ['a', 'b', 123]
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||
```
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