PHP code example of eventjet / ausdruck

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

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

    

eventjet / ausdruck example snippets

use Eventjet\Ausdruck\Parser\ExpressionParser;
use Eventjet\Ausdruck\Parser\Types;
use Eventjet\Ausdruck\Type;

$expression = ExpressionParser::parse(
    'joe:MyPersonType.name:string()',
    new Types(['MyPersonType' => Type::listOf(Type::string())]),
);
$scope = new Scope(
    // Passing values to the expression
    ['joe' => ['joe']],
    // Custom function definitions
    ['name' => static fn (array $person): string => $person[0]],
);
$name = $expression->evaluate($scope);
assert($name === 'Joe');

use Eventjet\Ausdruck\Parser\ExpressionParser;
use Eventjet\Ausdruck\Scope;

$x = ExpressionParser::parse('foo:int')
    ->evaluate(new Scope(['foo' => 123]));
assert($x === 123); 

  use Eventjet\Ausdruck\Parser\ExpressionParser;
  use Eventjet\Ausdruck\Type;
  
  ExpressionParser::parse('foo:MyType', ['MyType' => Type::alias(Type::listOf(Type::string()))]);
  

use Eventjet\Ausdruck\Parser\Declarations;
use Eventjet\Ausdruck\Type;

// zip: fn<T, U>(list<T>, list<U>) -> list<{ a: T, b: U }>
$zip = Type::func(
    Type::listOf(Type::struct(['a' => Type::var('T'), 'b' => Type::var('U')])),
    [Type::listOf(Type::var('T')), Type::listOf(Type::var('U'))],
);
$declarations = new Declarations(functions: ['zip' => $zip]);

// myMap: fn<T, U>(list<T>, fn(T) -> U) -> list<U>
$myMap = Type::func(
    Type::listOf(Type::var('U')),
    [Type::listOf(Type::var('T')), Type::func(Type::var('U'), [Type::var('T')])],
);
$declarations = new Declarations(functions: ['myMap' => $myMap]);

use Eventjet\Ausdruck\Parser\ExpressionParser;use Eventjet\Ausdruck\Scope;

$scope = new Scope(
    ['foo' => 'My secret'],
    ['mask' => fn (string $str, string $mask) => str_repeat($mask, strlen($str))]
);
$result = ExpressionParser::parse('foo:string.mask("x")')->evaluate($scope);
assert($result === 'xxxxxxxxx');