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<?php declare(strict_types=1);
/*
* This file is part of PHPUnit.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace PHPUnit\Framework\Constraint;
use function array_map;
use function array_values;
use function count;
/**
* @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
*/
abstract class BinaryOperator extends Operator
{
/**
* @var Constraint[]
*/
private $constraints = [];
public static function fromConstraints(Constraint ...$constraints): self
{
$constraint = new static;
$constraint->constraints = $constraints;
return $constraint;
}
/**
* @param mixed[] $constraints
*/
public function setConstraints(array $constraints): void
{
$this->constraints = array_map(function ($constraint): Constraint
{
return $this->checkConstraint($constraint);
}, array_values($constraints));
}
/**
* Returns the number of operands (constraints).
*/
final public function arity(): int
{
return count($this->constraints);
}
/**
* Returns a string representation of the constraint.
*/
public function toString(): string
{
$reduced = $this->reduce();
if ($reduced !== $this) {
return $reduced->toString();
}
$text = '';
foreach ($this->constraints as $key => $constraint) {
$constraint = $constraint->reduce();
$text .= $this->constraintToString($constraint, $key);
}
return $text;
}
/**
* Counts the number of constraint elements.
*/
public function count(): int
{
$count = 0;
foreach ($this->constraints as $constraint) {
$count += count($constraint);
}
return $count;
}
/**
* Returns the nested constraints.
*/
final protected function constraints(): array
{
return $this->constraints;
}
/**
* Returns true if the $constraint needs to be wrapped with braces.
*/
final protected function constraintNeedsParentheses(Constraint $constraint): bool
{
return $this->arity() > 1 && parent::constraintNeedsParentheses($constraint);
}
/**
* Reduces the sub-expression starting at $this by skipping degenerate
* sub-expression and returns first descendant constraint that starts
* a non-reducible sub-expression.
*
* See Constraint::reduce() for more.
*/
protected function reduce(): Constraint
{
if ($this->arity() === 1 && $this->constraints[0] instanceof Operator) {
return $this->constraints[0]->reduce();
}
return parent::reduce();
}
/**
* Returns string representation of given operand in context of this operator.
*
* @param Constraint $constraint operand constraint
* @param int $position position of $constraint in this expression
*/
private function constraintToString(Constraint $constraint, int $position): string
{
$prefix = '';
if ($position > 0) {
$prefix = (' ' . $this->operator() . ' ');
}
if ($this->constraintNeedsParentheses($constraint)) {
return $prefix . '( ' . $constraint->toString() . ' )';
}
$string = $constraint->toStringInContext($this, $position);
if ($string === '') {
$string = $constraint->toString();
}
return $prefix . $string;
}
}
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