function Grapheme::grapheme_position

4 calls to Grapheme::grapheme_position()

Grapheme::grapheme_stripos in vendor/symfony/polyfill-intl-grapheme/Grapheme.php

Grapheme::grapheme_strpos in vendor/symfony/polyfill-intl-grapheme/Grapheme.php

Grapheme::grapheme_strripos in vendor/symfony/polyfill-intl-grapheme/Grapheme.php

Grapheme::grapheme_strrpos in vendor/symfony/polyfill-intl-grapheme/Grapheme.php

File

vendor/symfony/polyfill-intl-grapheme/Grapheme.php, line 194

Class

Grapheme

Partial intl implementation in pure PHP.

Namespace

Symfony\Polyfill\Intl\Grapheme

Code

private static function grapheme_position($s, $needle, $offset, $mode) {
    $needle = (string) $needle;
    if (80000 > \PHP_VERSION_ID && !preg_match('/./us', $needle)) {
        return false;
    }
    $s = (string) $s;
    if (!preg_match('/./us', $s)) {
        return false;
    }
    if ($offset > 0) {
        $s = self::grapheme_substr($s, $offset);
    }
    elseif ($offset < 0) {
        if (2 > $mode) {
            $offset += self::grapheme_strlen($s);
            $s = self::grapheme_substr($s, $offset);
            if (0 > $offset) {
                $offset = 0;
            }
        }
        elseif (0 > ($offset += self::grapheme_strlen($needle))) {
            $s = self::grapheme_substr($s, 0, $offset);
            $offset = 0;
        }
        else {
            $offset = 0;
        }
    }
    // As UTF-8 is self-synchronizing, and we have ensured the strings are valid UTF-8,
    // we can use normal binary string functions here. For case-insensitive searches,
    // case fold the strings first.
    $caseInsensitive = $mode & 1;
    $reverse = $mode & 2;
    if ($caseInsensitive) {
        // Use the same case folding mode as mbstring does for mb_stripos().
        // Stick to SIMPLE case folding to avoid changing the length of the string, which
        // might result in offsets being shifted.
        $mode = \defined('MB_CASE_FOLD_SIMPLE') ? \MB_CASE_FOLD_SIMPLE : \MB_CASE_LOWER;
        $s = mb_convert_case($s, $mode, 'UTF-8');
        $needle = mb_convert_case($needle, $mode, 'UTF-8');
        if (!\defined('MB_CASE_FOLD_SIMPLE')) {
            $s = str_replace(self::CASE_FOLD[0], self::CASE_FOLD[1], $s);
            $needle = str_replace(self::CASE_FOLD[0], self::CASE_FOLD[1], $needle);
        }
    }
    if ($reverse) {
        $needlePos = strrpos($s, $needle);
    }
    else {
        $needlePos = strpos($s, $needle);
    }
    return false !== $needlePos ? self::grapheme_strlen(substr($s, 0, $needlePos)) + $offset : false;
}