PHP code example of webmozart / expression

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

webmozart / expression example snippets

use Webmozart\Expression\Expression;

interface PersonRepository
{
    public function findPersons(Expression $expr);
}

$expr = Expr::method('getFirstName', Expr::startsWith('Tho'))
    ->andMethod('getAge', Expr::greaterThan(35));
    
$persons = $repository->findPersons($expr);

class PersonRepositoryImpl implements PersonRepository
{
    private $persons = [];
    
    public function findPersons(Expression $expr)
    {
        return Expr::filter($this->persons, $expr);
    }
}

class IsPremium extends Method
{
    public function __construct()
    {
        parent::__construct('isPremium', [], Expr::same(true));
    }
}

class HasPreviousBookings extends Method
{
    public function __construct()
    {
        parent::__construct(
            'getBookings', 
            [], 
            Expr::count(Expr::greaterThan(0))
        );
    }
}

// Check if a customer is premium
if ((new IsPremium())->evaluate($customer)) {
    // ...
}

// Get premium customers with bookings
$customers = $repo->findCustomers(Expr::andX([
    new IsPremium(),
    new HasPreviousBookings(),
]));

$expr = Expr::key('age', Expr::greaterThan(10));

$expr->evaluate(['age' => 12]);
// => true

$expr = Expr::property('age', Expr::greaterThan(10));

$expr->evaluate(new Person(12));
// => true

$expr = Expr::method('getAge', Expr::greaterThan(10));

$expr->evaluate(new Person(12));
// => true

$expr = Expr::method('getParameter', 'age', Expr::greaterThan(10));

$expr->evaluate(new Person(12));
// => true

$expr = Expr::method('getBirthDate', Expr::method('format', 'Y', Expr::lessThan(2000)));

$expr->evaluate(new Person(12));
// => false

$expr = Expr::all(Expr::method('getAge', Expr::greaterThan(10)));

$expr->evaluate([new Person(12), new Person(11)]);
// => true

$expr = Expr::not(Expr::method('getFirstName', Expr::startsWith('Tho')));

$expr = Expr::method('getFirstName', Expr::startsWith('Tho'))
    ->andMethod('getAge', Expr::greaterThan(35));

$expr = Expr::method('getFirstName', Expr::startsWith('Tho'))
    ->orMethod('getAge', Expr::greaterThan(35));

$expr = Expr::method('getAge', Expr::greaterThan(35)->orLessThan(20));

$expr = Expr::method('getFirstName', Expr::startsWith('Tho'))
    ->andX(
        Expr::method('getAge', Expr::lessThan(14))
            ->orMethod('isReduced', Expr::same(true))
    );

// tests/bootstrap.php
use SebastianBergmann\Comparator\Factory;
use Webmozart\Expression\PhpUnit\ExpressionComparator;

// Logically equivalent
$c1 = Expr::notNull()->andSame(35);
$c2 = Expr::same(35)->andNotNull();

$c1 == $c2;
// => false

$c1->equivalentTo($c2);
// => true

// Also logically equivalent
$c1 = Expr::same(35);
$c2 = Expr::oneOf([35]);

$c1 == $c2;
// => false

$c1->equivalentTo($c2);
// => true

use Webmozart\Expression\Traversal\ExpressionVisitor;

class QueryBuilderVisitor implements ExpressionVisitor
{
    private $qb;
    
    public function __construct(QueryBuilder $qb)
    {
        $this->qb = $qb;
    }
    
    public function enterExpression(Expression $expr)
    {
        // configure the $qb...
    }
    
    public function leaveExpression(Expression $expr)
    {
        // configure the $qb...
    }
}

public function expressionToQueryBuilder(Expression $expr)
{
    $qb = new QueryBuilder();
    
    $traverser = new ExpressionTraverser();
    $traverser->addVisitor(new QueryBuilderVisitor($qb));
    $traverser->traverse($expr);
    
    return $qb;
}