PHP-Parser/doc/4_Code_generation.markdown

Code generation
===============

It is also possible to generate code using the parser, by first creating an Abstract Syntax Tree and then using the
pretty printer to convert it to PHP code. To simplify code generation, the project comes with a set of builders for
namespaces, classes, interfaces, traits, methods, functions, parameters and properties. The builders allow creating node
trees using a fluid interface, instead of instantiating all nodes manually.

Here is an example:

```php
<?php
$factory = new PhpParser\BuilderFactory;
$node = $factory->namespace('Name\Space')
    ->addStmt($factory->class('SomeClass')
        ->extend('SomeOtherClass')
        ->implement('A\Few', '\Interfaces')
        ->makeAbstract() // ->makeFinal()

        ->addStmt($factory->method('someMethod')
            ->makeAbstract() // ->makeFinal()
            ->addParam($factory->param('someParam')->setTypeHint('SomeClass'))
            ->setDocComment('/**
                              * This method does something.
                              *
                              * @param SomeClass And takes a parameter
                              */')
        )

        ->addStmt($factory->method('anotherMethod')
            ->makeProtected() // ->makePublic() [default], ->makePrivate()
            ->addParam($factory->param('someParam')->setDefault('test'))
            // it is possible to add manually created nodes
            ->addStmt(new PhpParser\Node\Expr\Print_(new PhpParser\Node\Expr\Variable('someParam')))
        )

        // properties will be correctly reordered above the methods
        ->addStmt($factory->property('someProperty')->makeProtected())
        ->addStmt($factory->property('anotherProperty')->makePrivate()->setDefault(array(1, 2, 3)))
    )

    ->getNode()
;

$stmts = array($node);
$prettyPrinter = new PhpParser\PrettyPrinter\Standard();
echo $prettyPrinter->prettyPrintFile($stmts);
```

This will produce the following output with the standard pretty printer:

```php
<?php

namespace Name\Space;

abstract class SomeClass extends SomeOtherClass implements A\Few, \Interfaces
{
    protected $someProperty;
    private $anotherProperty = array(1, 2, 3);
    /**
     * This method does something.
     *
     * @param SomeClass And takes a parameter
     */
    public abstract function someMethod(SomeClass $someParam);
    protected function anotherMethod($someParam = 'test')
    {
        print $someParam;
    }
}
```