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@ 2024-09-10T17:04:30Z

<?php

#BLM

final class ABNFParser
{
    private const ABNF_REGEX = <<<'REGEX'
    (?(DEFINE)
        (?<ALPHA>[A-Za-z])
        (?<DIGIT>[0-9])
        (?<SP>[\x20])
        (?<WSP>[(?&SP)\x09])
        (?<CR>\x0D)
        (?<LF>\x0A)
        (?<Repeat>(?:(?:(?&DIGIT)+(?:(?&DIGIT)*[\x2A](?&DIGIT)*))))
    )
    REGEX;

    public function parse(string $input, string $rule): ?string
    {
        // Build the query pattern dynamically based on the provided rule
        $pattern = sprintf('#%s(?&%s)#Aux', self::ABNF_REGEX, $rule);
        
        if (preg_match($pattern, $input, $matches)) {
            return $matches[0];
        }

        return null;
    }
}

# Example Usage

$parser = new ABNFParser();

$input = '2*4';
$rule = 'Repeat';
$parsedResult = $parser->parse($input, $rule);

var_dump($parsedResult); // Outputs: string(3) "2*4"

Output for git.master_jit, git.master, rfc.property-hooks: string(3) "2*4"

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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