pop-code

OVERVIEW

pop-code provides the ability to dynamically generate PHP code on the fly as well as parse and modify existing PHP code.

pop-code is a component of the Pop PHP Framework.

INSTALL

Install pop-code using Composer.

composer require popphp/pop-code

BASIC USAGE

There are a number of individual code generators available to manage the creation and output of various types of code blocks. Code generators are available for the following type of code:

• Classes
• Interfaces
• Traits
• Methods
• Functions
• Constants
• Properties
• Namespaces
• Docblocks
• Bodies (general blocks of code)

A simple function

use Pop\Code\Generator;

$function = new Generator\FunctionGenerator('sayHello');
$function->addArgument('name');
$function->setBody("echo 'Hello ' . \$name;");
$function->setDesc('This is the first function');

echo $function;

The above code will produce the following function:

/**
 * This is the first function
 * 
 * @param $name
 */
function sayHello($name)
{
    echo 'Hello ' . $name;
}

If you'd like to generate a standalone block or file of code, the main class Pop\Code\Generator can consume instances of the various available code generators. With it, you have flexibility to generate code that can be saved to a file or output to the screen.

Create a file with some functions

use Pop\Code\Generator;

$function1 = new Generator\FunctionGenerator('sayHello');
$function1->addArgument('name');
$function1->setBody("echo 'Hello ' . \$name;");
$function1->setDesc('This is the first function');

$function2 = new Generator\FunctionGenerator('sayGoodbye');
$function2->addArgument('name');
$function2->setBody("echo 'Goodbye ' . \$name;");
$function2->setDesc('This is the second function');

$code = new Generator();
$code->addCodeObjects([$function1, $function2]);
$code->writeToFile('code.php');

The above code will produce a file called code.php with the following code in it:

<?php

/**
 * This is the first function
 * 
 * @param $name
 */
function sayHello($name)
{
    echo 'Hello ' . $name;
}

/**
 * This is the second function
 * 
 * @param $name
 */
function sayGoodbye($name)
{
    echo 'Goodbye ' . $name;
}

Create a class with a property and a method

use Pop\Code\Generator;

// Create the class object and give it a namespace
$class = new Generator\ClassGenerator('MyClass');
$class->setNamespace(new Generator\NamespaceGenerator('MyApp'));

// Create a new protected property with a default value
$prop = new Generator\PropertyGenerator('foo', 'string', 'bar', 'protected');

// Create a method and give it an argument, body and docblock description
$method = new Generator\MethodGenerator('setFoo', 'public');
$method->addArgument('foo')
    ->setBody('$this->foo = $foo;')
    ->setDesc('This is the method to set foo.');

// Add the property and the method to the class code object
$class->addProperty($prop);
$class->addMethod($method);

// Save the class file
$code = new Generator($class);

// Or, you can echo out the contents of the code directly
echo $code;

The newly created class will look like:

<?php

/**
 * @namespace 
 */
namespace MyApp;

class MyClass
{

    /**
     * @var   string
     */
    protected $foo = 'bar';

    /**
     * This is the method to set foo.
     * 
     * @param $foo
     */
    public function setFoo($foo)
    {
        $this->foo = $foo;
    }

}

Parse an existing class and add a method to it

In this example, we use the class that we created above. The reflection object provides you with a code generator object like the one above so that you can add or remove things from the parsed code.

use Pop\Code\Reflection;
use Pop\Code\Generator;

$class = Reflection::createClass('MyApp\MyClass');

// Create the new method that you want to add to the existing class
$method = new Generator\MethodGenerator('hasFoo', 'public');
$method->addArgument('foo')
    ->setBody('return (null !== $this->foo);')
    ->setDesc('This is the method to see if foo is set.');

// Access the generator and it's code object to add the new method to it
$class->addMethod($method);

// Echo out the code
$code = new Generator($class);

// Or, you can echo out the contents of the code directly
echo $code;

The modified class will look like:

<?php

/**
 * @namespace 
 */
namespace MyApp;

class MyClass
{

    /**
     * 
     * @var   string
     */
    protected $foo = 'bar';

    /**
     * @param $foo
     */
    public function setFoo($foo)
    {
        $this->foo = $foo;
    }

    /**
     * This is the method to see if foo is set.
     * 
     * @param $foo
     */
    public function hasFoo($foo)
    {
        return (null !== $this->foo);
    }

}

As you can see, the new method was appended to the class.