<?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 sprintf;
use Countable;
use PHPUnit\Framework\ExpectationFailedException;
use PHPUnit\Framework\SelfDescribing;
use SebastianBergmann\Comparator\ComparisonFailure;
use SebastianBergmann\Exporter\Exporter;
use SebastianBergmann\RecursionContext\InvalidArgumentException;
/**
* @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
*/
abstract class Constraint implements Countable, SelfDescribing
{
/**
* @var ?Exporter
*/
private $exporter;
/**
* Evaluates the constraint for parameter $other.
*
* If $returnResult is set to false (the default), an exception is thrown
* in case of a failure. null is returned otherwise.
*
* If $returnResult is true, the result of the evaluation is returned as
* a boolean value instead: true in case of success, false in case of a
* failure.
*
* @throws ExpectationFailedException
* @throws InvalidArgumentException
*/
public function evaluate($other, string $description = '', bool $returnResult = false): ?bool
{
$success = false;
if ($this->matches($other)) {
$success = true;
}
if ($returnResult) {
return $success;
}
if (!$success) {
$this->fail($other, $description);
}
return null;
}
/**
* Counts the number of constraint elements.
*/
public function count(): int
{
return 1;
}
protected function exporter(): Exporter
{
if ($this->exporter === null) {
$this->exporter = new Exporter;
}
return $this->exporter;
}
/**
* Evaluates the constraint for parameter $other. Returns true if the
* constraint is met, false otherwise.
*
* This method can be overridden to implement the evaluation algorithm.
*
* @param mixed $other value or object to evaluate
*
* @codeCoverageIgnore
*/
protected function matches($other): bool
{
return false;
}
/**
* Throws an exception for the given compared value and test description.
*
* @param mixed $other evaluated value or object
* @param string $description Additional information about the test
*
* @throws ExpectationFailedException
* @throws InvalidArgumentException
*
* @psalm-return never-return
*/
protected function fail($other, $description, ?ComparisonFailure $comparisonFailure = null): void
{
$failureDescription = sprintf(
'Failed asserting that %s.',
$this->failureDescription($other),
);
$additionalFailureDescription = $this->additionalFailureDescription($other);
if ($additionalFailureDescription) {
$failureDescription .= "\n" . $additionalFailureDescription;
}
if (!empty($description)) {
$failureDescription = $description . "\n" . $failureDescription;
}
throw new ExpectationFailedException(
$failureDescription,
$comparisonFailure,
);
}
/**
* Return additional failure description where needed.
*
* The function can be overridden to provide additional failure
* information like a diff
*
* @param mixed $other evaluated value or object
*/
protected function additionalFailureDescription($other): string
{
return '';
}
/**
* Returns the description of the failure.
*
* The beginning of failure messages is "Failed asserting that" in most
* cases. This method should return the second part of that sentence.
*
* To provide additional failure information additionalFailureDescription
* can be used.
*
* @param mixed $other evaluated value or object
*
* @throws InvalidArgumentException
*/
protected function failureDescription($other): string
{
return $this->exporter()->export($other) . ' ' . $this->toString();
}
/**
* Returns a custom string representation of the constraint object when it
* appears in context of an $operator expression.
*
* The purpose of this method is to provide meaningful descriptive string
* in context of operators such as LogicalNot. Native PHPUnit constraints
* are supported out of the box by LogicalNot, but externally developed
* ones had no way to provide correct strings in this context.
*
* The method shall return empty string, when it does not handle
* customization by itself.
*
* @param Operator $operator the $operator of the expression
* @param mixed $role role of $this constraint in the $operator expression
*/
protected function toStringInContext(Operator $operator, $role): string
{
return '';
}
/**
* Returns the description of the failure when this constraint appears in
* context of an $operator expression.
*
* The purpose of this method is to provide meaningful failure description
* in context of operators such as LogicalNot. Native PHPUnit constraints
* are supported out of the box by LogicalNot, but externally developed
* ones had no way to provide correct messages in this context.
*
* The method shall return empty string, when it does not handle
* customization by itself.
*
* @param Operator $operator the $operator of the expression
* @param mixed $role role of $this constraint in the $operator expression
* @param mixed $other evaluated value or object
*/
protected function failureDescriptionInContext(Operator $operator, $role, $other): string
{
$string = $this->toStringInContext($operator, $role);
if ($string === '') {
return '';
}
return $this->exporter()->export($other) . ' ' . $string;
}
/**
* Reduces the sub-expression starting at $this by skipping degenerate
* sub-expression and returns first descendant constraint that starts
* a non-reducible sub-expression.
*
* Returns $this for terminal constraints and for operators that start
* non-reducible sub-expression, or the nearest descendant of $this that
* starts a non-reducible sub-expression.
*
* A constraint expression may be modelled as a tree with non-terminal
* nodes (operators) and terminal nodes. For example:
*
* LogicalOr (operator, non-terminal)
* + LogicalAnd (operator, non-terminal)
* | + IsType('int') (terminal)
* | + GreaterThan(10) (terminal)
* + LogicalNot (operator, non-terminal)
* + IsType('array') (terminal)
*
* A degenerate sub-expression is a part of the tree, that effectively does
* not contribute to the evaluation of the expression it appears in. An example
* of degenerate sub-expression is a BinaryOperator constructed with single
* operand or nested BinaryOperators, each with single operand. An
* expression involving a degenerate sub-expression is equivalent to a
* reduced expression with the degenerate sub-expression removed, for example
*
* LogicalAnd (operator)
* + LogicalOr (degenerate operator)
* | + LogicalAnd (degenerate operator)
* | + IsType('int') (terminal)
* + GreaterThan(10) (terminal)
*
* is equivalent to
*
* LogicalAnd (operator)
* + IsType('int') (terminal)
* + GreaterThan(10) (terminal)
*
* because the subexpression
*
* + LogicalOr
* + LogicalAnd
* + -
*
* is degenerate. Calling reduce() on the LogicalOr object above, as well
* as on LogicalAnd, shall return the IsType('int') instance.
*
* Other specific reductions can be implemented, for example cascade of
* LogicalNot operators
*
* + LogicalNot
* + LogicalNot
* +LogicalNot
* + IsTrue
*
* can be reduced to
*
* LogicalNot
* + IsTrue
*/
protected function reduce(): self
{
return $this;
}
}
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