PHP code example of krixon / rules

1. Go to this page and download the library: Download krixon/rules library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php.

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

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

krixon / rules example snippets


public function generate(ComparisonNode $comparison) : Specification


class EmailAddressMatches implements Specification
{
    private $email;
    
    
    public function __construct(string $email)
    {
        $this->email = $email;
    }
    
    
    public function isSatisfiedBy($value) : bool
    {
        return $value instanceof User && $value->hasEmailAddress($this->email);
    }
}


class MyCompiler extends BaseCompiler
{
  public function generate(ComparisonNode $comparison) : Specification
  {
      $identifier = $comparison->identifierFullName();
      
      if (strtolower($indentifier) !== 'email') {
          throw CompilerError::unknownIdentifier($identifier);
      }
      
      if (!$comparison->isEquals()) {
          throw CompilerError::unsupportedComparisonType($comparison->type(), $identifier);
      }
  
      return new EmailAddressMatches($comparison->literalValue());
  }
}


public function attempt(ComparisonNode $comparison) : ?Specification;


$generator = new EmailAddressGenerator();
$compiler  = new DelegatingCompiler($generator);


$generator = new EmailAddressGenerator();
$compiler  = new DelegatingCompiler();

$compiler->register($generator, 100); // Priority of 100.