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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\Logging\TestDox;

use function array_key_exists;
use function array_keys;
use function array_map;
use function array_pop;
use function array_values;
use function assert;
use function class_exists;
use function explode;
use function gettype;
use function implode;
use function is_bool;
use function is_float;
use function is_int;
use function is_object;
use function is_scalar;
use function method_exists;
use function preg_quote;
use function preg_replace;
use function rtrim;
use function sprintf;
use function str_contains;
use function str_ends_with;
use function str_replace;
use function str_starts_with;
use function strlen;
use function strtolower;
use function strtoupper;
use function substr;
use function trim;
use PHPUnit\Framework\TestCase;
use PHPUnit\Metadata\Parser\Registry as MetadataRegistry;
use PHPUnit\Metadata\TestDox;
use PHPUnit\Util\Color;
use ReflectionEnum;
use ReflectionMethod;
use ReflectionObject;
use SebastianBergmann\Exporter\Exporter;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 *
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class NamePrettifier
{
    /**
     * @psalm-var array<string, int>
     */
    private static array $strings = [];

/**
     * @psalm-param class-string $className
     */
    public function prettifyTestClassName(string $className): string
    {
        if (class_exists($className)) {
            $classLevelTestDox = MetadataRegistry::parser()->forClass($className)->isTestDox();

if ($classLevelTestDox->isNotEmpty()) {
                $classLevelTestDox = $classLevelTestDox->asArray()[0];

assert($classLevelTestDox instanceof TestDox);

return $classLevelTestDox->text();
            }
        }

$parts     = explode('\\', $className);
        $className = array_pop($parts);

if (str_ends_with($className, 'Test')) {
            $className = substr($className, 0, strlen($className) - strlen('Test'));
        }

if (str_starts_with($className, 'Tests')) {
            $className = substr($className, strlen('Tests'));
        } elseif (str_starts_with($className, 'Test')) {
            $className = substr($className, strlen('Test'));
        }

if (empty($className)) {
            $className = 'UnnamedTests';
        }

if (!empty($parts)) {
            $parts[]            = $className;
            $fullyQualifiedName = implode('\\', $parts);
        } else {
            $fullyQualifiedName = $className;
        }

$result = preg_replace('/(?<=[[:lower:]])(?=[[:upper:]])/u', ' ', $className);

if ($fullyQualifiedName !== $className) {
            return $result . ' (' . $fullyQualifiedName . ')';
        }

return $result;
    }

// NOTE: this method is on a hot path and very performance sensitive. change with care.
    public function prettifyTestMethodName(string $name): string
    {
        if ($name === '') {
            return '';
        }

$string = rtrim($name, '0123456789');

if (array_key_exists($string, self::$strings)) {
            $name = $string;
        } elseif ($string === $name) {
            self::$strings[$string] = 1;
        }

if (str_starts_with($name, 'test_')) {
            $name = substr($name, 5);
        } elseif (str_starts_with($name, 'test')) {
            $name = substr($name, 4);
        }

if ($name === '') {
            return '';
        }

$name[0] = strtoupper($name[0]);

$noUnderscore = str_replace('_', ' ', $name);

if ($noUnderscore !== $name) {
            return trim($noUnderscore);
        }

$wasNumeric = false;

$buffer = '';

$len = strlen($name);

for ($i = 0; $i < $len; $i++) {
            if ($i > 0 && $name[$i] >= 'A' && $name[$i] <= 'Z') {
                $buffer .= ' ' . strtolower($name[$i]);
            } else {
                $isNumeric = $name[$i] >= '0' && $name[$i] <= '9';

if (!$wasNumeric && $isNumeric) {
                    $buffer .= ' ';
                    $wasNumeric = true;
                }

if ($wasNumeric && !$isNumeric) {
                    $wasNumeric = false;
                }

$buffer .= $name[$i];
            }
        }

return $buffer;
    }

public function prettifyTestCase(TestCase $test, bool $colorize): string
    {
        $annotationWithPlaceholders = false;
        $methodLevelTestDox         = MetadataRegistry::parser()->forMethod($test::class, $test->name())->isTestDox()->isMethodLevel();

if ($methodLevelTestDox->isNotEmpty()) {
            $methodLevelTestDox = $methodLevelTestDox->asArray()[0];

assert($methodLevelTestDox instanceof TestDox);

$result = $methodLevelTestDox->text();

if (str_contains($result, '$')) {
                $annotation   = $result;
                $providedData = $this->mapTestMethodParameterNamesToProvidedDataValues($test, $colorize);

$variables = array_map(
                    static fn (string $variable): string => sprintf(
                        '/%s(?=\b)/',
                        preg_quote($variable, '/'),
                    ),
                    array_keys($providedData),
                );

$result = trim(preg_replace($variables, $providedData, $annotation));

$annotationWithPlaceholders = true;
            }
        } else {
            $result = $this->prettifyTestMethodName($test->name());
        }

if (!$annotationWithPlaceholders && $test->usesDataProvider()) {
            $result .= $this->prettifyDataSet($test, $colorize);
        }

return $result;
    }

public function prettifyDataSet(TestCase $test, bool $colorize): string
    {
        if (!$colorize) {
            return $test->dataSetAsString();
        }

if (is_int($test->dataName())) {
            return Color::dim(' with data set ') . Color::colorize('fg-cyan', (string) $test->dataName());
        }

return Color::dim(' with ') . Color::colorize('fg-cyan', Color::visualizeWhitespace($test->dataName()));
    }

private function mapTestMethodParameterNamesToProvidedDataValues(TestCase $test, bool $colorize): array
    {
        assert(method_exists($test, $test->name()));

/** @noinspection PhpUnhandledExceptionInspection */
        $reflector = new ReflectionMethod($test::class, $test->name());

$providedData       = [];
        $providedDataValues = array_values($test->providedData());
        $i                  = 0;

$providedData['$_dataName'] = $test->dataName();

foreach ($reflector->getParameters() as $parameter) {
            if (!array_key_exists($i, $providedDataValues) && $parameter->isDefaultValueAvailable()) {
                $providedDataValues[$i] = $parameter->getDefaultValue();
            }

$value = $providedDataValues[$i++] ?? null;

if (is_object($value)) {
                $reflector = new ReflectionObject($value);

if ($reflector->isEnum()) {
                    $enumReflector = new ReflectionEnum($value);

if ($enumReflector->isBacked()) {
                        $value = $value->value;
                    } else {
                        $value = $value->name;
                    }
                } elseif ($reflector->hasMethod('__toString')) {
                    $value = (string) $value;
                } else {
                    $value = $value::class;
                }
            }

if (!is_scalar($value)) {
                $value = gettype($value);

if ($value === 'NULL') {
                    $value = 'null';
                }
            }

if (is_bool($value) || is_int($value) || is_float($value)) {
                $value = (new Exporter)->export($value);
            }

if ($value === '') {
                if ($colorize) {
                    $value = Color::colorize('dim,underlined', 'empty');
                } else {
                    $value = "''";
                }
            }

$providedData['$' . $parameter->getName()] = $value;
        }

if ($colorize) {
            $providedData = array_map(
                static fn ($value) => Color::colorize('fg-cyan', Color::visualizeWhitespace((string) $value, true)),
                $providedData,
            );
        }

return $providedData;
    }
}

✏️ Editing: NamePrettifier.php

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