lagdo / dbadmin-driver

src/Utils/Str.php

<?php


namespace Lagdo\DbAdmin\Driver\Utils;


use function str_replace;

use function preg_replace;

use function preg_match;

use function htmlspecialchars;


class Str

{

    /**

     * @inheritDoc

     */

    public function html(?string $string): string

    {

        if(!$string) {

            return '';

        }

        $string = str_replace("\n", '<br>', $string);

        return str_replace("\0", '&#0;', htmlspecialchars($string, ENT_QUOTES, 'utf-8'));

    }


    /**

     * @inheritDoc

     */

    public function number(string $value): string

    {

        return preg_replace('~[^0-9]+~', '', $value);

    }


    /**

     * @inheritDoc

     */

    public function isUtf8(string $value): bool

    {

        // don't print control chars except \t\r\n

        return (preg_match('~~u', $value) && !preg_match('~[\0-\x8\xB\xC\xE-\x1F]~', $value));

    }


    /**

     * Create repeat pattern for preg

     *

     * @param string $pattern

     * @param int $length

     *

     * @return string

     */

    private function repeatPattern(string $pattern, int $length): string

    {

        // fix for Compilation failed: number too big in {} quantifier

        // can create {0,0} which is OK

        $times = round($length / 65535, 0, PHP_ROUND_HALF_DOWN);

        return str_repeat("$pattern{0,65535}", $times) . "$pattern{0," . ($length % 65535) . '}';

$times of type double is incompatible with the type integer expected by parameter $times of str_repeat().

    }


    /**

     * Shorten UTF-8 string

     *

     * @param string $string

     * @param int $length

     * @param string $suffix

     *

     * @return string

     */

    public function shortenUtf8(string $string, int $length = 80, string $suffix = ''): string

    {

        if (!preg_match('(^(' . $this->repeatPattern("[\t\r\n -\x{10FFFF}]", $length) . ')($)?)u', $string, $match)) {

            // ~s causes trash in $match[2] under some PHP versions, (.|\n) is slow

            preg_match('(^(' . $this->repeatPattern("[\t\r\n -~]", $length) . ')($)?)', $string, $match);

        }

        return $this->html($match[1]) . $suffix . (isset($match[2]) ? '' : '<i>…</i>');

    }

}