BrowscapPHP\Helper\Quoter

Complexity

Total Complexity

3

Size/Duplication

Total Lines	53
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	0

Test Coverage

Coverage

21.43%

Importance

Changes

0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	pregQuote()	0	7	1
B	pregUnQuote()	0	28	2

<?php
declare(strict_types = 1);

namespace BrowscapPHP\Helper;

/**
 * class to help quoting strings for using a regex
 */
final class Quoter
{
    /**
     * Converts browscap match patterns into preg match patterns.
     *
     * @param string $user_agent
     * @param string $delimiter
     *
     * @return string
     */
    public function pregQuote(string $user_agent, string $delimiter = '/') : string
    {
        $pattern = preg_quote($user_agent, $delimiter);

        // the \\x replacement is a fix for "Der gro\xdfe BilderSauger 2.00u" user agent match
        return str_replace(['\*', '\?', '\\x'], ['.*', '.', '\\\\x'], $pattern);
    }

    /**
     * Reverts the quoting of a pattern.
     *
     * @param  string $pattern
     * @return string
     */
    public function pregUnQuote(string $pattern) : string
    {
        // Fast check, because most parent pattern like 'DefaultProperties' don't need a replacement
        if (preg_match('/[^a-z\s]/i', $pattern)) {
            // Undo the \\x replacement, that is a fix for "Der gro\xdfe BilderSauger 2.00u" user agent match
            // @source https://github.com/browscap/browscap-php
            $pattern = preg_replace(
                ['/(?<!\\\\)\\.\\*/', '/(?<!\\\\)\\./', '/(?<!\\\\)\\\\x/'],
                ['\\*', '\\?', '\\x'],
                $pattern
            );

            // Undo preg_quote
            $pattern = str_replace(
                [
                    '\\\\', '\\+', '\\*', '\\?', '\\[', '\\^', '\\]', '\\$', '\\(', '\\)', '\\{', '\\}', '\\=',
                    '\\!', '\\<', '\\>', '\\|', '\\:', '\\-', '\\.', '\\/',
                ],
                [
                    '\\', '+', '*', '?', '[', '^', ']', '$', '(', ')', '{', '}', '=', '!', '<', '>', '|', ':',
                    '-', '.', '/',
                ],
                $pattern
            );
        }

        return $pattern;
    }
}