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Overview
Install
Quickstart
Generate Code
Parse 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.

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Install

Install pop-code using Composer.

composer require popphp/pop-code

Or, require it in your composer.json file

"require": {
    "popphp/pop-view" : "^5.0.3"
}

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Quickstart

Create a simple function

In this example, a function is created and rendered to a string:

use Pop\Code\Generator;

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

echo $function;

/**
 * This is the first function
 * 
 * @param  string|null  $name
 * @return void
 */
function sayHello(string|null $name = null): void
{
    echo 'Hello ' . $name;
}

Create a simple class

In this example, a class is created and saved to a file:

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', null, 'protected');

// Create a method and give it an argument, body and docblock description
$method = new Generator\MethodGenerator('setFoo', 'public');
$method->addArgument('foo', null, 'string')
    ->setBody('$this->foo = $foo;')
    ->addReturnType('void')
    ->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 to a file
$code = new Generator($class);
$code->writeToFile('MuClass.php');

The contents of the file will be:

<?php

/**
 * @namespace 
 */
namespace MyApp;

class MyClass
{

    /**
     * @var   string
     */
    protected string|null $foo = null;

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

}

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Generate Code

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)

Create a file with some functions

use Pop\Code\Generator;

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

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

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

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

<?php

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

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

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Parse Code

This pop-code component also provides the ability to parse existing code, which is useful to obtain information about the code or to even modify and save new code.

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');
$method->addArgument('foo', null, 'string')
    ->setBody('return ($this->foo !== null);')
    ->setDesc('This is the method to see if foo is set.')
    ->addReturnType('bool');

// 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);
$code->writeToFile('MyClass.php');

And the modified class will look like, complete with the new hasFoo() method:

<?php

/**
 * @namespace 
 */
namespace MyApp;

class MyClass
{

    /**
     * @var   string
     */
    protected string|null $foo = null;

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

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

}

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