ProvideUTF8CodepointRange.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\Tests\Refinery\Encode\Transformation;
 
trait ProvideUTF8CodepointRange
{
    private static function oneByteRangeExcept(array $ignore = []): array
    {
        $byte_range = range(0, 0xFE);
        $set_names = array_map(fn(int $codepoint) => 'Codepoint: ' . $codepoint, $byte_range);
 
        return array_combine(
            $set_names,
            array_map(
                fn(string $chr, int $codepoint) => (
                    self::ctype_alnum($chr) || in_array($chr, $ignore, true) ?
                        self::asDataProviderArgs($chr, 'assertSame') :
                        self::asDataProviderArgs(self::isAscii($codepoint) ? $chr : self::twoByteChar($codepoint), 'assertNotSame')
                ),
                array_map(chr(...), $byte_range),
                $byte_range
            )
        );
    }
 
    private static function ctype_alnum(string $chr): bool
    {
        return preg_match('/^[a-zA-Z0-9]+$/', $chr) > 0;
    }
 
    private static function isAscii(int $codepoint): bool
    {
        return $codepoint <= 127;
    }
 
    private static function twoByteChar(int $codepoint): string
    {
        return chr($codepoint >> 6 & 0x3f | 0xc0) . chr($codepoint & 0x3f | 0x80);
    }
 
    private static function asDataProviderArgs(string $chr, string $method): array
    {
        return [$chr, $chr, $method];
    }
}