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<?php
namespace ApiQL\Language;
/**
* Class AbstractLanguage
*
* @package ApiQL\Language
*/
abstract class AbstractLanguage implements LanguageInterface
{
/**
* Relational operators
*
* @var static
*/
private static $RELATION_OPERATORS = ['eq', 'neq', 'lt', 'lte', 'gt', 'gte', 'is_null', 'is_not_null',
'like', 'not_like', 'in', 'not_in', 'equals_any', 'not_equals_any', 'equals_all', 'not_equals_all', 'search', 'se'];
/**
* Relation key in expression
*
* @var const
*/
public const RELATION = 'rel';
/**
* Logic operators
*
* @var static
*/
private static $LOGIC_OPERATORS = ['and', 'or'];
/**
* Logic key in expression
*
* @var const
*/
public const LOGIC = 'logic';
/**
* Spec key in expression
*
* @var const
*/
public const SPEC = 'spec';
/**
* Expression to be interpreted
*
* @var array
*/
protected $expression = [];
/**
* Query builder decorator
*
* @var ApiQueryBuilder
*/
protected static $builder = null;
/**
* Specification mappings
*
* @var array
*/
protected static $specs = [];
/**
* Construct abstract interpreter
*
* @param array $expression - expression to be interpreted
* @param mixed $builder - implementation of query builder
*/
public function __construct(array $expression)
{
$this->expression = $expression;
}
/**
* Check if it is unary operator
*
* @param string $operator - operator to be checked
*
* @return bool
*/
public static function isRelationOperator(string $operator): bool
{
return in_array($operator, self::$RELATION_OPERATORS);
}
/**
* Check if it is variadic operator
*
* @param string $operator - operator to be checked
*
* @return bool
*/
public static function isLogicOperator(string $operator): bool
{
return in_array($operator, self::$LOGIC_OPERATORS);
}
/**
* Get relation operator from expression
*
* @param array $expression - expression with operator
*
* @return null|string
*/
public static function getRelationOperator(array $expression): ?string
{
if (array_key_exists(self::RELATION, $expression) && self::isRelationOperator($expression[self::RELATION])) {
return $expression[self::RELATION];
}
return null;
}
/**
* Get logic operator from expression
*
* @param array $expression - expression with operator
*
* @return null|string
*/
public static function getLogicOperator(array $expression): ?string
{
if (array_key_exists(self::LOGIC, $expression) && self::isLogicOperator($expression[self::LOGIC])) {
return $expression[self::LOGIC];
}
return null;
}
/**
* Check if it is specification
*
* @param string $operator - operator to be checked
*
* @return bool
*/
public static function isSpecification(string $operator): bool
{
return $operator == 'spec';
}
/**
* Apply handler method based on its type
*
* @param string $name method name
* @param mixed $args interpreters
*
* @return mixed
*
* @throws InvalidArgumentException
*/
public function method(string $name = null, ...$args)
{
$interpreters = array_map(function ($interpreter) {
return $interpreter->execute();
}, $args);
switch ($name) {
case 'or':
return self::$builder->orX(...$interpreters);
case 'and':
return self::$builder->andX(...$interpreters);
case 'spec':
return self::$builder->spec(...$interpreters);
default:
throw new \InvalidArgumentException(sprintf('Method "%s" not found', $name));
}
}
/**
* Execute expression
*
* @return mixed
*/
abstract public function execute();
}