# Zend\\Code\\Generator Examples

## Generating PHP classes

The following example generates an empty class with a class-level DocBlock.

```php
use Zend\Code\Generator\ClassGenerator;
use Zend\Code\Generator\DocBlockGenerator;

$foo      = new ClassGenerator();
$docblock = DocBlockGenerator::fromArray(array(
    'shortDescription' => 'Sample generated class',
    'longDescription'  => 'This is a class generated with Zend\Code\Generator.',
    'tags'             => array(
        array(
            'name'        => 'version',
            'description' => '$Rev:$',
        ),
        array(
            'name'        => 'license',
            'description' => 'New BSD',
        ),
    ),
));
$foo->setName('Foo')
    ->setDocblock($docblock);
echo $foo->generate();
```

The above code will result in the following:

```php
/**
 * Sample generated class
 *
 * This is a class generated with Zend\Code\Generator.
 *
 * @version $Rev:$
 * @license New BSD
 *
 */
class Foo
{

}
```

### Generating PHP classes with class properties

Building on the previous example, we now add properties to our generated class.

```php
use Zend\Code\Generator\ClassGenerator;
use Zend\Code\Generator\DocBlockGenerator;
use Zend\Code\Generator\PropertyGenerator;

$foo      = new ClassGenerator();
$docblock = DocBlockGenerator::fromArray(array(
    'shortDescription' => 'Sample generated class',
    'longDescription'  => 'This is a class generated with Zend\Code\Generator.',
    'tags'             => array(
        array(
            'name'        => 'version',
            'description' => '$Rev:$',
        ),
        array(
            'name'        => 'license',
            'description' => 'New BSD',
        ),
    ),
));
$foo->setName('Foo')
    ->setDocblock($docblock)
    ->addProperties(array(
         array('_bar', 'baz',          PropertyGenerator::FLAG_PROTECTED),
         array('baz',  'bat',          PropertyGenerator::FLAG_PUBLIC)
   ))
   ->addConstants(array(
         array('bat',  'foobarbazbat')
    ));
echo $foo->generate();
```

The above results in the following class definition:

```php
/**
 * Sample generated class
 *
 * This is a class generated with Zend\Code\Generator.
 *
 * @version $Rev:$
 * @license New BSD
 *
 */
class Foo
{

    protected $_bar = 'baz';

    public $baz = 'bat';

    const bat = 'foobarbazbat';

}
```

### Generating PHP classes with class methods

`Zend\Code\Generator\ClassGenerator` allows you to attach methods with optional content to your
classes. Methods may be attached as either arrays or concrete `Zend\Code\Generator\MethodGenerator`
instances.

```php
use Zend\Code\Generator\ClassGenerator;
use Zend\Code\Generator\DocBlockGenerator;
use Zend\Code\Generator\DocBlock\Tag;
use Zend\Code\Generator\MethodGenerator;
use Zend\Code\Generator\PropertyGenerator;

$foo      = new ClassGenerator();
$docblock = DocBlockGenerator::fromArray(array(
    'shortDescription' => 'Sample generated class',
    'longDescription'  => 'This is a class generated with Zend\Code\Generator.',
    'tags'             => array(
        array(
            'name'        => 'version',
            'description' => '$Rev:$',
        ),
        array(
            'name'        => 'license',
            'description' => 'New BSD',
        ),
    ),
));
$foo->setName('Foo')
    ->setDocblock($docblock)
    ->addProperties(array(
        array('_bar', 'baz',          PropertyGenerator::FLAG_PROTECTED),
        array('baz',  'bat',          PropertyGenerator::FLAG_PUBLIC)
    ))
    ->addConstants(array(
        array('bat',  'foobarbazbat', PropertyGenerator::FLAG_CONSTANT)
    ))
    ->addMethods(array(
        // Method passed as array
        MethodGenerator::fromArray(array(
            'name'       => 'setBar',
            'parameters' => array('bar'),
            'body'       => '$this->_bar = $bar;' . "\n" . 'return $this;',
            'docblock'   => DocBlockGenerator::fromArray(array(
                'shortDescription' => 'Set the bar property',
                'longDescription'  => null,
                'tags'             => array(
                    new Tag\ParamTag(array(
                        'paramName' => 'bar',
                        'datatype'  => 'string'
                    )),
                    new Tag\ReturnTag(array(
                        'datatype'  => 'string',
                    )),
                ),
            )),
        )),
        // Method passed as concrete instance
        new MethodGenerator(
            'getBar',
            array(),
            MethodGenerator::FLAG_PUBLIC,
            'return $this->_bar;',
            DocBlockGenerator::fromArray(array(
                'shortDescription' => 'Retrieve the bar property',
                'longDescription'  => null,
                'tags'             => array(
                    new Tag\ReturnTag(array(
                        'datatype'  => 'string|null',
                    )),
                ),
            ))
        ),
    ));

echo $foo->generate();
```

The above generates the following output:

```php
/**
 * Sample generated class
 *
 * This is a class generated with Zend\Code\Generator.
 *
 * @version $Rev:$
 * @license New BSD
 */
class Foo
{

    protected $_bar = 'baz';

    public $baz = 'bat';

    const bat = 'foobarbazbat';

    /**
     * Set the bar property
     *
     * @param string bar
     * @return string
     */
    public function setBar($bar)
    {
        $this->_bar = $bar;
        return $this;
    }

    /**
     * Retrieve the bar property
     *
     * @return string|null
     */
    public function getBar()
    {
        return $this->_bar;
    }

}
```

## Generating PHP files

`Zend\Code\Generator\FileGenerator` can be used to generate the contents of a *PHP* file. You can
include classes as well as arbitrary content body. When attaching classes, you should attach either
concrete `Zend\Code\Generator\ClassGenerator` instances or an array defining the class.

In the example below, we will assume you've defined `$foo` per one of the class definitions in a
previous example.

```php
use Zend\Code\Generator\DocBlockGenerator;
use Zend\Code\Generator\FileGenerator;

$file = FileGenerator::fromArray(array(
    'classes'  => array($foo),
    'docblock' => DocBlockGenerator::fromArray(array(
        'shortDescription' => 'Foo class file',
        'longDescription'   => null,
        'tags'             => array(
            array(
                'name'        => 'license',
                'description' => 'New BSD',
            ),
        ),
    )),
    'body'     => 'define(\'APPLICATION_ENV\', \'testing\');',
));
```

Calling `generate()` will generate the code -- but not write it to a file. You will need to capture
the contents and write them to a file yourself. As an example:

```php
$code = $file->generate();
file_put_contents('Foo.php', $code);
```

The above will generate the following file:

```php
<?php
/**
 * Foo class file
 *
 * @license New BSD
 */

/**
 * Sample generated class
 *
 * This is a class generated with Zend\Code\Generator.
 *
 * @version $Rev:$
 * @license New BSD
 */
class Foo
{

    protected $_bar = 'baz';

    public $baz = 'bat';

    const bat = 'foobarbazbat';

    /**
     * Set the bar property
     *
     * @param string bar
     * @return string
     */
    public function setBar($bar)
    {
        $this->_bar = $bar;
        return $this;
    }

    /**
     * Retrieve the bar property
     *
     * @return string|null
     */
    public function getBar()
    {
        return $this->_bar;
    }

}

define('APPLICATION_ENV', 'testing');
```

## Add code to existing PHP files and classes

### Seeding PHP file code generation via reflection

You can add *PHP* code to an existing *PHP* file using the code generator. To do so, you need to
first do reflection on it. The static method `fromReflectedFileName()` allows you to do this.

```php
$generator = Zend\Code\Generator\FileGenerator::fromReflectedFileName($path);   
$generator->setBody("\$foo->bar();");
file_put_contents($path, $generator->generate());
```

### Seeding PHP class generation via reflection

You may add code to an existing class. To do so, first use the static `fromReflection()` method to
map the class into a generator object. From there, you may add additional properties or methods, and
then regenerate the class.

```php
use Zend\Code\Generator\ClassGenerator;
use Zend\Code\Generator\DocBlockGenerator;
use Zend\Code\Generator\DocBlock\Tag;
use Zend\Code\Generator\MethodGenerator;
use Zend\Code\Reflection\ClassReflection;

$generator = ClassGenerator::fromReflection(
    new ClassReflection($class)
);
$generator->addMethod(
    'setBaz',
    array('baz'),
    MethodGenerator::FLAG_PUBLIC,
    '$this->_baz = $baz;' . "\n" . 'return $this;',
    DocBlockGenerator::fromArray(array(
        'shortDescription' => 'Set the baz property',
        'longDescription'  => null,
        'tags'             => array(
            new Tag\ParamTag(array(
                'paramName' => 'baz',
                'datatype'  => 'string'
            )),
            new Tag\ReturnTag(array(
                'datatype'  => 'string',
            )),
        ),
    ))
);
$code = $generator->generate();
```