compilation.md

Compile a mapper into a dedicated class

Using the Spaghetti code compilation strategy

This strategy will produce a mapper with an unique method, with every mapping instruction into it. This will produce spaghetti code. It is the default strategy.

Considering you have the following script:

<?php

use Kiboko\Component\FastMap\Compiler;
use Kiboko\Component\FastMap\PropertyAccess\EmptyPropertyPath;
use Kiboko\Component\FastMap\Mapping\Composite;
use Kiboko\Component\FastMap\Mapping\Field;
use Kiboko\Component\Metadata\ClassTypeMetadata;
use Symfony\Component\PropertyAccess\PropertyPath;

$compiler = new Compiler\Strategy\Spaghetti();
$tree = $compiler->buildTree(
    new EmptyPropertyPath(),
    new ClassTypeMetadata('Foo\\Component\\FooMapper'),
    new Composite\ArrayMapper(
        new Field(
            new PropertyPath('[customer][name]'),
            new Field\ConstantValueMapper('John Doe')
        ),
        new Field(
            new PropertyPath('[address]'),
            new Field\ConcatCopyValuesMapper(
                ', ',
                new PropertyPath('[customerAddress][name]'),
                new PropertyPath('[customerAddress][street]'),
                new PropertyPath('[customerAddress][postcode]'),
                new PropertyPath('[customerAddress][city]')
            )
        )
    )
);

file_put_contents('./FooMapper.php', $prettyPrinter->prettyPrintFile($tree));

Will result in the generation of the following class:

<?php

namespace Foo\Component;

final class BarMapper implements \Kiboko\Component\FastMap\Contracts\CompiledMapperInterface
{
    public function __invoke($input, $output = null)
    {
        if (!isset($output)) {
            $output = [];
        }
        if (!isset($output['customer'])) {
            $output['customer'] = [];
        }
        $output['customer']['first_name'] = 'John Doe';
        if (!isset($input['customerAddress']['name'])) {
            throw new \RuntimeException('Could not evaluate path [customerAddress][name]');
        }
        if (!isset($input['customerAddress']['street'])) {
            throw new \RuntimeException('Could not evaluate path [customerAddress][street]');
        }
        if (!isset($input['customerAddress']['postcode'])) {
            throw new \RuntimeException('Could not evaluate path [customerAddress][postcode]');
        }
        if (!isset($input['customerAddress']['city'])) {
            throw new \RuntimeException('Could not evaluate path [customerAddress][city]');
        }
        if (!isset($output)) {
            $output = [];
        }
        $output['address'] = $input['customerAddress']['name'] . ', ' . $input['customerAddress']['street'] . ', ' . $input['customerAddress']['postcode'] . ', ' . $input['customerAddress']['city'];
        return $output;
    }
}