PHP code example of stratadox / parser

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

stratadox / parser example snippets

use Stratadox\Parser\Helpers\Between;
use Stratadox\Parser\Parser;
use function Stratadox\Parser\any;
use function Stratadox\Parser\pattern;

function csvParser(
    Parser|string $sep = ',',
    Parser|string $esc = '"',
): Parser {
    $newline = pattern('\r\n|\r|\n');
    return Between::escaped('"', '"', $esc)
        ->or(any()->except($newline->or($sep)->or($esc))->repeatableString())
        ->mustSplit($sep)->maybe()
        ->split($newline)
        ->end();
}

use Stratadox\Parser\Containers\Grammar;
use Stratadox\Parser\Containers\Lazy;
use Stratadox\Parser\Parser;
use function Stratadox\Parser\pattern;
use function Stratadox\Parser\text;

function calculationsParser(): Parser
{
    $grammar = Grammar::with($lazy = Lazy::container());

    $sign = text('+')->or('-')->maybe();
    $digits = pattern('\d+');
    $map = fn($op, $l, $r) => [
        'op' => $op,
        'arg' => [$l, $r],
    ];

    $grammar['prio 0'] = $sign->andThen($digits, '.', $digits)->join()->map(fn($x) => (float) $x)
        ->or($sign->andThen($digits)->join()->map(fn($x) => (int) $x))
        ->between(text(' ')->or("\t", "\n", "\r")->repeatable()->optional());

    $lazy['prio 1'] = $grammar['prio 0']->andThen('^', $grammar['prio 0'])->map(fn($a) => [
        'op' => '^',
        'arg' => [$a[0], $a[2]],
    ])->or($grammar['prio 0']);

    $grammar['prio 2'] = $grammar['prio 1']->keepSplit(['*', '/'], $map)->or($grammar['prio 1']);

    $grammar['prio 3'] = $grammar['prio 2']->keepSplit(['+', '-'], $map)->or($grammar['prio 2']);

    return $grammar['prio 3']->end();
}