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BindGenerator.php
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BindGenerator.php
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<?php
namespace Eris\Generator;
use Eris\Generator;
use Eris\Generators;
use Eris\Random\RandomRange;
function bind(Generator $innerGenerator, callable $outerGeneratorFactory)
{
return Generators::bind($innerGenerator, $outerGeneratorFactory);
}
/**
* @psalm-template T
* @template-implements Generator<T>
*/
class BindGenerator implements Generator
{
private $innerGenerator;
private $outerGeneratorFactory;
public function __construct($innerGenerator, $outerGeneratorFactory)
{
$this->innerGenerator = $innerGenerator;
$this->outerGeneratorFactory = $outerGeneratorFactory;
}
public function __invoke($size, RandomRange $rand)
{
$innerGeneratorValue = $this->innerGenerator->__invoke($size, $rand);
$outerGenerator = call_user_func($this->outerGeneratorFactory, $innerGeneratorValue->unbox());
$outerGeneratorValue = $outerGenerator->__invoke($size, $rand);
return $this->packageGeneratedValueSingle(
$outerGeneratorValue,
$innerGeneratorValue
);
}
public function shrink(GeneratedValue $element)
{
list($outerGeneratorValue, $innerGeneratorValue) = $element->input();
// TODO: shrink also the second generator
$outerGenerator = call_user_func($this->outerGeneratorFactory, $innerGeneratorValue->unbox());
$shrinkedOuterGeneratorValue = $outerGenerator->shrink($outerGeneratorValue);
return $this->packageGeneratedValueSingle(
$shrinkedOuterGeneratorValue,
$innerGeneratorValue
);
}
private function packageGeneratedValueSingle($outerGeneratorValue, $innerGeneratorValue)
{
return GeneratedValueSingle::fromValueAndInput(
$outerGeneratorValue->unbox(),
[
$outerGeneratorValue,
$innerGeneratorValue,
],
'bind'
);
}
}

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Sat, May 16, 17:59 (8 h, 28 m)
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BindGenerator.php (1 KB)

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