API for source code generator / modifier

sourcebuilderproto.php

<?php

$builder = $sourceBuilder->prototypeBuilder();
$builder->namespace('Animals');
$builder->use('Measurements\\Height');
$builder->class('Rabbits')
    ->properties()
        ->property('television')
            ->visiblity('private')
        ->end()
    ->end()
    ->methods()
        ->method('jump')
            ->position(0) // prepend
            ->parameters()
                ->parameter('how)
                    ->default('high')
                    ->type('Measurements\\Height')
                ->end()
            ->end()
            ->body()
                ->append('$this->television = "lamp"')
            ->end()

$prototype = $builder->build();

// apply prototype to existing source code (idempotent)
$sourceBuilder->apply($prototype, file_get_contents('SomeFile.php'));

// generate source
$sourceBuilder->generate($prototype);