Limonte\AdblockRule::makeRegex()

Complexity

Conditions	9
Paths	11

Size

Total Lines	51
Code Lines	21

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

<?php
    private function makeRegex()
    {
        if (empty($this->rule)) {
            throw new InvalidRuleException("Empty rule");
        }

        $regex = $this->rule;

        // Check if the rule isn't already regexp
        if ($this->startsWith($regex, '/') && $this->endsWith($regex, '/')) {
            $this->regex = mb_substr($this->rule, 1, mb_strlen($this->rule) - 2);

            if (empty($this->regex)) {
                throw new InvalidRuleException("Empty rule");
            }

            return;
        }

        // escape special regex characters
        $regex = preg_replace("/([\\\.\$\+\?\{\}\(\)\[\]\/])/", "\\\\$1", $this->rule);

        // Separator character ^ matches anything but a letter, a digit, or
        // one of the following: _ - . %. The end of the address is also
        // accepted as separator.
        $regex = str_replace("^", "([^\w\d_\-.%]|$)", $regex);

        // * symbol
        $regex = str_replace("*", ".*", $regex);

        // | in the end means the end of the address
        if ($this->endsWith($regex, '|')) {
            $regex = mb_substr($regex, 0, mb_strlen($regex) - 1) . '$';
        }

        // || in the beginning means beginning of the domain name
        if ($this->startsWith($regex, '||')) {
            if (mb_strlen($regex) > 2) {
                // http://tools.ietf.org/html/rfc3986#appendix-B
                $regex = "^([^:\/?#]+:)?(\/\/([^\/?#]*\.)?)?" . mb_substr($regex, 2);
            }
        // | in the beginning means start of the address
        } elseif ($this->startsWith($regex, '|')) {
            $regex = '^' . mb_substr($regex, 1);
        }

        // other | symbols should be escaped
        $regex = preg_replace("/\|(?![\$])/", "\|$1", $regex);

        $this->regex = $regex;
    }