function Idn::validateBidiLabel

Parameters

string $label:

See also

https://tools.ietf.org/html/rfc5893#section-2

1 call to Idn::validateBidiLabel()

Idn::validateLabel in vendor/symfony/polyfill-intl-idn/Idn.php

File

vendor/symfony/polyfill-intl-idn/Idn.php, line 388

Class

Idn

@internal

Namespace

Symfony\Polyfill\Intl\Idn

Code

private static function validateBidiLabel($label, Info $info) {
    if (1 === preg_match(Regex::RTL_LABEL, $label)) {
        $info->bidiDomain = true;
        // Step 1. The first character must be a character with Bidi property L, R, or AL.
        // If it has the R or AL property, it is an RTL label
        if (1 !== preg_match(Regex::BIDI_STEP_1_RTL, $label)) {
            $info->validBidiDomain = false;
            return;
        }
        // Step 2. In an RTL label, only characters with the Bidi properties R, AL, AN, EN, ES,
        // CS, ET, ON, BN, or NSM are allowed.
        if (1 === preg_match(Regex::BIDI_STEP_2, $label)) {
            $info->validBidiDomain = false;
            return;
        }
        // Step 3. In an RTL label, the end of the label must be a character with Bidi property
        // R, AL, EN, or AN, followed by zero or more characters with Bidi property NSM.
        if (1 !== preg_match(Regex::BIDI_STEP_3, $label)) {
            $info->validBidiDomain = false;
            return;
        }
        // Step 4. In an RTL label, if an EN is present, no AN may be present, and vice versa.
        if (1 === preg_match(Regex::BIDI_STEP_4_AN, $label) && 1 === preg_match(Regex::BIDI_STEP_4_EN, $label)) {
            $info->validBidiDomain = false;
            return;
        }
        return;
    }
    // We are a LTR label
    // Step 1. The first character must be a character with Bidi property L, R, or AL.
    // If it has the L property, it is an LTR label.
    if (1 !== preg_match(Regex::BIDI_STEP_1_LTR, $label)) {
        $info->validBidiDomain = false;
        return;
    }
    // Step 5. In an LTR label, only characters with the Bidi properties L, EN,
    // ES, CS, ET, ON, BN, or NSM are allowed.
    if (1 === preg_match(Regex::BIDI_STEP_5, $label)) {
        $info->validBidiDomain = false;
        return;
    }
    // Step 6.In an LTR label, the end of the label must be a character with Bidi property L or
    // EN, followed by zero or more characters with Bidi property NSM.
    if (1 !== preg_match(Regex::BIDI_STEP_6, $label)) {
        $info->validBidiDomain = false;
        return;
    }
}