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/src/Utils/Strings.php

<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Utils;

use JetBrains\PhpStorm\Language;
use Nette;
use function is_array, is_object, strlen;


/**
 * String tools library.
 */
class Strings
{
        use Nette\StaticClass;

        public const TrimCharacters = " \t\n\r\0\x0B\u{A0}\u{2000}\u{2001}\u{2002}\u{2003}\u{2004}\u{2005}\u{2006}\u{2007}\u{2008}\u{2009}\u{200A}\u{200B}";

        /** @deprecated use Strings::TrimCharacters */
        public const TRIM_CHARACTERS = self::TrimCharacters;


        /**
         * @deprecated use Nette\Utils\Validator::isUnicode()
         */
        public static function checkEncoding(string $s): bool
        {
                return $s === self::fixEncoding($s);
        }


        /**
         * Removes all invalid UTF-8 characters from a string.
         */
        public static function fixEncoding(string $s): string
        {
                // removes xD800-xDFFF, x110000 and higher
                return htmlspecialchars_decode(htmlspecialchars($s, ENT_NOQUOTES | ENT_IGNORE, 'UTF-8'), ENT_NOQUOTES);
        }


        /**
         * Returns a specific character in UTF-8 from code point (number in range 0x0000..D7FF or 0xE000..10FFFF).
         * @throws Nette\InvalidArgumentException if code point is not in valid range
         */
        public static function chr(int $code): string
        {
                if ($code < 0 || ($code >= 0xD800 && $code <= 0xDFFF) || $code > 0x10FFFF) {
                        throw new Nette\InvalidArgumentException('Code point must be in range 0x0 to 0xD7FF or 0xE000 to 0x10FFFF.');
                } elseif (!extension_loaded('iconv')) {
                        throw new Nette\NotSupportedException(__METHOD__ . '() requires ICONV extension that is not loaded.');
                }

                return iconv('UTF-32BE', 'UTF-8//IGNORE', pack('N', $code));
        }


        /**
         * Returns a code point of specific character in UTF-8 (number in range 0x0000..D7FF or 0xE000..10FFFF).
         */
        public static function ord(string $c): int
        {
                if (!extension_loaded('iconv')) {
                        throw new Nette\NotSupportedException(__METHOD__ . '() requires ICONV extension that is not loaded.');
                }

                $tmp = iconv('UTF-8', 'UTF-32BE//IGNORE', $c);
                if (!$tmp) {
                        throw new Nette\InvalidArgumentException('Invalid UTF-8 character "' . ($c === '' ? '' : '\x' . strtoupper(bin2hex($c))) . '".');
                }

                return unpack('N', $tmp)[1];
        }


        /**
         * @deprecated use str_starts_with()
         */
        public static function startsWith(string $haystack, string $needle): bool
        {
                return str_starts_with($haystack, $needle);
        }


        /**
         * @deprecated use str_ends_with()
         */
        public static function endsWith(string $haystack, string $needle): bool
        {
                return str_ends_with($haystack, $needle);
        }


        /**
         * @deprecated use str_contains()
         */
        public static function contains(string $haystack, string $needle): bool
        {
                return str_contains($haystack, $needle);
        }


        /**
         * Returns a part of UTF-8 string specified by starting position and length. If start is negative,
         * the returned string will start at the start'th character from the end of string.
         */
        public static function substring(string $s, int $start, ?int $length = null): string
        {
                if (function_exists('mb_substr')) {
                        return mb_substr($s, $start, $length, 'UTF-8'); // MB is much faster
                } elseif (!extension_loaded('iconv')) {
                        throw new Nette\NotSupportedException(__METHOD__ . '() requires extension ICONV or MBSTRING, neither is loaded.');
                } elseif ($length === null) {
                        $length = self::length($s);
                } elseif ($start < 0 && $length < 0) {
                        $start += self::length($s); // unifies iconv_substr behavior with mb_substr
                }

                return iconv_substr($s, $start, $length, 'UTF-8');
        }


        /**
         * Removes control characters, normalizes line breaks to `\n`, removes leading and trailing blank lines,
         * trims end spaces on lines, normalizes UTF-8 to the normal form of NFC.
         */
        public static function normalize(string $s): string
        {
                // convert to compressed normal form (NFC)
                if (class_exists('Normalizer', false) && ($n = \Normalizer::normalize($s, \Normalizer::FORM_C)) !== false) {
                        $s = $n;
                }

                $s = self::unixNewLines($s);

                // remove control characters; leave \t + \n
                $s = self::pcre('preg_replace', ['#[\x00-\x08\x0B-\x1F\x7F-\x9F]+#u', '', $s]);

                // right trim
                $s = self::pcre('preg_replace', ['#[\t ]+$#m', '', $s]);

                // leading and trailing blank lines
                $s = trim($s, "\n");

                return $s;
        }


        /** @deprecated use Strings::unixNewLines() */
        public static function normalizeNewLines(string $s): string
        {
                return self::unixNewLines($s);
        }


        /**
         * Converts line endings to \n used on Unix-like systems.
         * Line endings are: \n, \r, \r\n, U+2028 line separator, U+2029 paragraph separator.
         */
        public static function unixNewLines(string $s): string
        {
                return preg_replace("~\r\n?|\u{2028}|\u{2029}~", "\n", $s);
        }


        /**
         * Converts line endings to platform-specific, i.e. \r\n on Windows and \n elsewhere.
         * Line endings are: \n, \r, \r\n, U+2028 line separator, U+2029 paragraph separator.
         */
        public static function platformNewLines(string $s): string
        {
                return preg_replace("~\r\n?|\n|\u{2028}|\u{2029}~", PHP_EOL, $s);
        }


        /**
         * Converts UTF-8 string to ASCII, ie removes diacritics etc.
         */
        public static function toAscii(string $s): string
        {
                $iconv = defined('ICONV_IMPL') ? trim(ICONV_IMPL, '"\'') : null;
                static $transliterator = null;
                if ($transliterator === null) {
                        if (class_exists('Transliterator', false)) {
                                $transliterator = \Transliterator::create('Any-Latin; Latin-ASCII');
                        } else {
                                trigger_error(__METHOD__ . "(): it is recommended to enable PHP extensions 'intl'.", E_USER_NOTICE);
                                $transliterator = false;
                        }
                }

                // remove control characters and check UTF-8 validity
                $s = self::pcre('preg_replace', ['#[^\x09\x0A\x0D\x20-\x7E\xA0-\x{2FF}\x{370}-\x{10FFFF}]#u', '', $s]);

                // transliteration (by Transliterator and iconv) is not optimal, replace some characters directly
                $s = strtr($s, ["\u{201E}" => '"', "\u{201C}" => '"', "\u{201D}" => '"', "\u{201A}" => "'", "\u{2018}" => "'", "\u{2019}" => "'", "\u{B0}" => '^', "\u{42F}" => 'Ya', "\u{44F}" => 'ya', "\u{42E}" => 'Yu', "\u{44E}" => 'yu', "\u{c4}" => 'Ae', "\u{d6}" => 'Oe', "\u{dc}" => 'Ue', "\u{1e9e}" => 'Ss', "\u{e4}" => 'ae', "\u{f6}" => 'oe', "\u{fc}" => 'ue', "\u{df}" => 'ss']); // „ “ ” ‚ ‘ ’ ° Я я Ю ю Ä Ö Ü ẞ ä ö ü ß
                if ($iconv !== 'libiconv') {
                        $s = strtr($s, ["\u{AE}" => '(R)', "\u{A9}" => '(c)', "\u{2026}" => '...', "\u{AB}" => '<<', "\u{BB}" => '>>', "\u{A3}" => 'lb', "\u{A5}" => 'yen', "\u{B2}" => '^2', "\u{B3}" => '^3', "\u{B5}" => 'u', "\u{B9}" => '^1', "\u{BA}" => 'o', "\u{BF}" => '?', "\u{2CA}" => "'", "\u{2CD}" => '_', "\u{2DD}" => '"', "\u{1FEF}" => '', "\u{20AC}" => 'EUR', "\u{2122}" => 'TM', "\u{212E}" => 'e', "\u{2190}" => '<-', "\u{2191}" => '^', "\u{2192}" => '->', "\u{2193}" => 'V', "\u{2194}" => '<->']); // ® © … « » £ ¥ ² ³ µ ¹ º ¿ ˊ ˍ ˝ ` € ™ ℮ ← ↑ → ↓ ↔
                }

                if ($transliterator) {
                        $s = $transliterator->transliterate($s);
                        // use iconv because The transliterator leaves some characters out of ASCII, eg → ʾ
                        if ($iconv === 'glibc') {
                                $s = strtr($s, '?', "\x01"); // temporarily hide ? to distinguish them from the garbage that iconv creates
                                $s = iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $s);
                                $s = str_replace(['?', "\x01"], ['', '?'], $s); // remove garbage and restore ? characters
                        } elseif ($iconv === 'libiconv') {
                                $s = iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $s);
                        } else { // null or 'unknown' (#216)
                                $s = self::pcre('preg_replace', ['#[^\x00-\x7F]++#', '', $s]); // remove non-ascii chars
                        }
                } elseif ($iconv === 'glibc' || $iconv === 'libiconv') {
                        // temporarily hide these characters to distinguish them from the garbage that iconv creates
                        $s = strtr($s, '`\'"^~?', "\x01\x02\x03\x04\x05\x06");
                        if ($iconv === 'glibc') {
                                // glibc implementation is very limited. transliterate into Windows-1250 and then into ASCII, so most Eastern European characters are preserved
                                $s = iconv('UTF-8', 'WINDOWS-1250//TRANSLIT//IGNORE', $s);
                                $s = strtr(
                                        $s,
                                        "\xa5\xa3\xbc\x8c\xa7\x8a\xaa\x8d\x8f\x8e\xaf\xb9\xb3\xbe\x9c\x9a\xba\x9d\x9f\x9e\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf8\xf9\xfa\xfb\xfc\xfd\xfe\x96\xa0\x8b\x97\x9b\xa6\xad\xb7",
                                        'ALLSSSSTZZZallssstzzzRAAAALCCCEEEEIIDDNNOOOOxRUUUUYTsraaaalccceeeeiiddnnooooruuuuyt- <->|-.',
                                );
                                $s = self::pcre('preg_replace', ['#[^\x00-\x7F]++#', '', $s]);
                        } else {
                                $s = iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $s);
                        }

                        // remove garbage that iconv creates during transliteration (eg Ý -> Y')
                        $s = str_replace(['`', "'", '"', '^', '~', '?'], '', $s);
                        // restore temporarily hidden characters
                        $s = strtr($s, "\x01\x02\x03\x04\x05\x06", '`\'"^~?');
                } else {
                        $s = self::pcre('preg_replace', ['#[^\x00-\x7F]++#', '', $s]); // remove non-ascii chars
                }

                return $s;
        }


        /**
         * Modifies the UTF-8 string to the form used in the URL, ie removes diacritics and replaces all characters
         * except letters of the English alphabet and numbers with a hyphens.
         */
        public static function webalize(string $s, ?string $charlist = null, bool $lower = true): string
        {
                $s = self::toAscii($s);
                if ($lower) {
                        $s = strtolower($s);
                }

                $s = self::pcre('preg_replace', ['#[^a-z0-9' . ($charlist !== null ? preg_quote($charlist, '#') : '') . ']+#i', '-', $s]);
                $s = trim($s, '-');
                return $s;
        }


        /**
         * Truncates a UTF-8 string to given maximal length, while trying not to split whole words. Only if the string is truncated,
         * an ellipsis (or something else set with third argument) is appended to the string.
         */
        public static function truncate(string $s, int $maxLen, string $append = "\u{2026}"): string
        {
                if (self::length($s) > $maxLen) {
                        $maxLen -= self::length($append);
                        if ($maxLen < 1) {
                                return $append;

                        } elseif ($matches = self::match($s, '#^.{1,' . $maxLen . '}(?=[\s\x00-/:-@\[-`{-~])#us')) {
                                return $matches[0] . $append;

                        } else {
                                return self::substring($s, 0, $maxLen) . $append;
                        }
                }

                return $s;
        }


        /**
         * Indents a multiline text from the left. Second argument sets how many indentation chars should be used,
         * while the indent itself is the third argument (*tab* by default).
         */
        public static function indent(string $s, int $level = 1, string $chars = "\t"): string
        {
                if ($level > 0) {
                        $s = self::replace($s, '#(?:^|[\r\n]+)(?=[^\r\n])#', '$0' . str_repeat($chars, $level));
                }

                return $s;
        }


        /**
         * Converts all characters of UTF-8 string to lower case.
         */
        public static function lower(string $s): string
        {
                return mb_strtolower($s, 'UTF-8');
        }


        /**
         * Converts the first character of a UTF-8 string to lower case and leaves the other characters unchanged.
         */
        public static function firstLower(string $s): string
        {
                return self::lower(self::substring($s, 0, 1)) . self::substring($s, 1);
        }


        /**
         * Converts all characters of a UTF-8 string to upper case.
         */
        public static function upper(string $s): string
        {
                return mb_strtoupper($s, 'UTF-8');
        }


        /**
         * Converts the first character of a UTF-8 string to upper case and leaves the other characters unchanged.
         */
        public static function firstUpper(string $s): string
        {
                return self::upper(self::substring($s, 0, 1)) . self::substring($s, 1);
        }


        /**
         * Converts the first character of every word of a UTF-8 string to upper case and the others to lower case.
         */
        public static function capitalize(string $s): string
        {
                return mb_convert_case($s, MB_CASE_TITLE, 'UTF-8');
        }


        /**
         * Compares two UTF-8 strings or their parts, without taking character case into account. If length is null, whole strings are compared,
         * if it is negative, the corresponding number of characters from the end of the strings is compared,
         * otherwise the appropriate number of characters from the beginning is compared.
         */
        public static function compare(string $left, string $right, ?int $length = null): bool
        {
                if (class_exists('Normalizer', false)) {
                        $left = \Normalizer::normalize($left, \Normalizer::FORM_D); // form NFD is faster
                        $right = \Normalizer::normalize($right, \Normalizer::FORM_D); // form NFD is faster
                }

                if ($length < 0) {
                        $left = self::substring($left, $length, -$length);
                        $right = self::substring($right, $length, -$length);
                } elseif ($length !== null) {
                        $left = self::substring($left, 0, $length);
                        $right = self::substring($right, 0, $length);
                }

                return self::lower($left) === self::lower($right);
        }


        /**
         * Finds the common prefix of strings or returns empty string if the prefix was not found.
         * @param  string[]  $strings
         */
        public static function findPrefix(array $strings): string
        {
                $first = array_shift($strings);
                for ($i = 0; $i < strlen($first); $i++) {
                        foreach ($strings as $s) {
                                if (!isset($s[$i]) || $first[$i] !== $s[$i]) {
                                        while ($i && $first[$i - 1] >= "\x80" && $first[$i] >= "\x80" && $first[$i] < "\xC0") {
                                                $i--;
                                        }

                                        return substr($first, 0, $i);
                                }
                        }
                }

                return $first;
        }


        /**
         * Returns number of characters (not bytes) in UTF-8 string.
         * That is the number of Unicode code points which may differ from the number of graphemes.
         */
        public static function length(string $s): int
        {
                return match (true) {
                        extension_loaded('mbstring') => mb_strlen($s, 'UTF-8'),
                        extension_loaded('iconv') => iconv_strlen($s, 'UTF-8'),
                        default => strlen(@utf8_decode($s)), // deprecated
                };
        }


        /**
         * Removes all left and right side spaces (or the characters passed as second argument) from a UTF-8 encoded string.
         */
        public static function trim(string $s, string $charlist = self::TrimCharacters): string
        {
                $charlist = preg_quote($charlist, '#');
                return self::replace($s, '#^[' . $charlist . ']+|[' . $charlist . ']+$#Du', '');
        }


        /**
         * Pads a UTF-8 string to given length by prepending the $pad string to the beginning.
         * @param  non-empty-string  $pad
         */
        public static function padLeft(string $s, int $length, string $pad = ' '): string
        {
                $length = max(0, $length - self::length($s));
                $padLen = self::length($pad);
                return str_repeat($pad, (int) ($length / $padLen)) . self::substring($pad, 0, $length % $padLen) . $s;
        }


        /**
         * Pads UTF-8 string to given length by appending the $pad string to the end.
         * @param  non-empty-string  $pad
         */
        public static function padRight(string $s, int $length, string $pad = ' '): string
        {
                $length = max(0, $length - self::length($s));
                $padLen = self::length($pad);
                return $s . str_repeat($pad, (int) ($length / $padLen)) . self::substring($pad, 0, $length % $padLen);
        }


        /**
         * Reverses UTF-8 string.
         */
        public static function reverse(string $s): string
        {
                if (!extension_loaded('iconv')) {
                        throw new Nette\NotSupportedException(__METHOD__ . '() requires ICONV extension that is not loaded.');
                }

                return iconv('UTF-32LE', 'UTF-8', strrev(iconv('UTF-8', 'UTF-32BE', $s)));
        }


        /**
         * Returns part of $haystack before $nth occurence of $needle or returns null if the needle was not found.
         * Negative value means searching from the end.
         */
        public static function before(string $haystack, string $needle, int $nth = 1): ?string
        {
                $pos = self::pos($haystack, $needle, $nth);
                return $pos === null
                        ? null
                        : substr($haystack, 0, $pos);
        }


        /**
         * Returns part of $haystack after $nth occurence of $needle or returns null if the needle was not found.
         * Negative value means searching from the end.
         */
        public static function after(string $haystack, string $needle, int $nth = 1): ?string
        {
                $pos = self::pos($haystack, $needle, $nth);
                return $pos === null
                        ? null
                        : substr($haystack, $pos + strlen($needle));
        }


        /**
         * Returns position in characters of $nth occurence of $needle in $haystack or null if the $needle was not found.
         * Negative value of `$nth` means searching from the end.
         */
        public static function indexOf(string $haystack, string $needle, int $nth = 1): ?int
        {
                $pos = self::pos($haystack, $needle, $nth);
                return $pos === null
                        ? null
                        : self::length(substr($haystack, 0, $pos));
        }


        /**
         * Returns position in characters of $nth occurence of $needle in $haystack or null if the needle was not found.
         */
        private static function pos(string $haystack, string $needle, int $nth = 1): ?int
        {
                if (!$nth) {
                        return null;
                } elseif ($nth > 0) {
                        if ($needle === '') {
                                return 0;
                        }

                        $pos = 0;
                        while (($pos = strpos($haystack, $needle, $pos)) !== false && --$nth) {
                                $pos++;
                        }
                } else {
                        $len = strlen($haystack);
                        if ($needle === '') {
                                return $len;
                        } elseif ($len === 0) {
                                return null;
                        }

                        $pos = $len - 1;
                        while (($pos = strrpos($haystack, $needle, $pos - $len)) !== false && ++$nth) {
                                $pos--;
                        }
                }

                return Helpers::falseToNull($pos);
        }


        /**
         * Divides the string into arrays according to the regular expression. Expressions in parentheses will be captured and returned as well.
         */
        public static function split(
                string $subject,
                #[Language('RegExp')]
                string $pattern,
                bool|int $captureOffset = false,
                bool $skipEmpty = false,
                int $limit = -1,
                bool $utf8 = false,
        ): array
        {
                $flags = is_int($captureOffset)  // back compatibility
                        ? $captureOffset
                        : ($captureOffset ? PREG_SPLIT_OFFSET_CAPTURE : 0) | ($skipEmpty ? PREG_SPLIT_NO_EMPTY : 0);

                $pattern .= $utf8 ? 'u' : '';
                $m = self::pcre('preg_split', [$pattern, $subject, $limit, $flags | PREG_SPLIT_DELIM_CAPTURE]);
                return $utf8 && $captureOffset
                        ? self::bytesToChars($subject, [$m])[0]
                        : $m;
        }


        /**
         * Searches the string for the part matching the regular expression and returns
         * an array with the found expression and individual subexpressions, or `null`.
         */
        public static function match(
                string $subject,
                #[Language('RegExp')]
                string $pattern,
                bool|int $captureOffset = false,
                int $offset = 0,
                bool $unmatchedAsNull = false,
                bool $utf8 = false,
        ): ?array
        {
                $flags = is_int($captureOffset) // back compatibility
                        ? $captureOffset
                        : ($captureOffset ? PREG_OFFSET_CAPTURE : 0) | ($unmatchedAsNull ? PREG_UNMATCHED_AS_NULL : 0);

                if ($utf8) {
                        $offset = strlen(self::substring($subject, 0, $offset));
                        $pattern .= 'u';
                }

                if ($offset > strlen($subject)) {
                        return null;
                } elseif (!self::pcre('preg_match', [$pattern, $subject, &$m, $flags, $offset])) {
                        return null;
                } elseif ($utf8 && $captureOffset) {
                        return self::bytesToChars($subject, [$m])[0];
                } else {
                        return $m;
                }
        }


        /**
         * Searches the string for all occurrences matching the regular expression and
         * returns an array of arrays containing the found expression and each subexpression.
         * @return ($lazy is true ? \Generator<int, array> : array[])
         */
        public static function matchAll(
                string $subject,
                #[Language('RegExp')]
                string $pattern,
                bool|int $captureOffset = false,
                int $offset = 0,
                bool $unmatchedAsNull = false,
                bool $patternOrder = false,
                bool $utf8 = false,
                bool $lazy = false,
        ): array|\Generator
        {
                if ($utf8) {
                        $offset = strlen(self::substring($subject, 0, $offset));
                        $pattern .= 'u';
                }

                if ($lazy) {
                        $flags = PREG_OFFSET_CAPTURE | ($unmatchedAsNull ? PREG_UNMATCHED_AS_NULL : 0);
                        return (function () use ($utf8, $captureOffset, $flags, $subject, $pattern, $offset) {
                                $counter = 0;
                                while (
                                        $offset <= strlen($subject) - ($counter ? 1 : 0)
                                        && self::pcre('preg_match', [$pattern, $subject, &$m, $flags, $offset])
                                ) {
                                        $offset = $m[0][1] + max(1, strlen($m[0][0]));
                                        if (!$captureOffset) {
                                                $m = array_map(fn($item) => $item[0], $m);
                                        } elseif ($utf8) {
                                                $m = self::bytesToChars($subject, [$m])[0];
                                        }
                                        yield $counter++ => $m;
                                }
                        })();
                }

                if ($offset > strlen($subject)) {
                        return [];
                }

                $flags = is_int($captureOffset) // back compatibility
                        ? $captureOffset
                        : ($captureOffset ? PREG_OFFSET_CAPTURE : 0) | ($unmatchedAsNull ? PREG_UNMATCHED_AS_NULL : 0) | ($patternOrder ? PREG_PATTERN_ORDER : 0);

                self::pcre('preg_match_all', [
                        $pattern, $subject, &$m,
                        ($flags & PREG_PATTERN_ORDER) ? $flags : ($flags | PREG_SET_ORDER),
                        $offset,
                ]);
                return $utf8 && $captureOffset
                        ? self::bytesToChars($subject, $m)
                        : $m;
        }


        /**
         * Replaces all occurrences matching regular expression $pattern which can be string or array in the form `pattern => replacement`.
         */
        public static function replace(
                string $subject,
                #[Language('RegExp')]
                string|array $pattern,
                string|callable $replacement = '',
                int $limit = -1,
                bool $captureOffset = false,
                bool $unmatchedAsNull = false,
                bool $utf8 = false,
        ): string
        {
                if (is_object($replacement) || is_array($replacement)) {
                        if (!is_callable($replacement, false, $textual)) {
                                throw new Nette\InvalidStateException("Callback '$textual' is not callable.");
                        }

                        $flags = ($captureOffset ? PREG_OFFSET_CAPTURE : 0) | ($unmatchedAsNull ? PREG_UNMATCHED_AS_NULL : 0);
                        if ($utf8) {
                                $pattern .= 'u';
                                if ($captureOffset) {
                                        $replacement = fn($m) => $replacement(self::bytesToChars($subject, [$m])[0]);
                                }
                        }

                        return self::pcre('preg_replace_callback', [$pattern, $replacement, $subject, $limit, 0, $flags]);

                } elseif (is_array($pattern) && is_string(key($pattern))) {
                        $replacement = array_values($pattern);
                        $pattern = array_keys($pattern);
                }

                if ($utf8) {
                        $pattern = array_map(fn($item) => $item . 'u', (array) $pattern);
                }

                return self::pcre('preg_replace', [$pattern, $replacement, $subject, $limit]);
        }


        private static function bytesToChars(string $s, array $groups): array
        {
                $lastBytes = $lastChars = 0;
                foreach ($groups as &$matches) {
                        foreach ($matches as &$match) {
                                if ($match[1] > $lastBytes) {
                                        $lastChars += self::length(substr($s, $lastBytes, $match[1] - $lastBytes));
                                } elseif ($match[1] < $lastBytes) {
                                        $lastChars -= self::length(substr($s, $match[1], $lastBytes - $match[1]));
                                }

                                $lastBytes = $match[1];
                                $match[1] = $lastChars;
                        }
                }

                return $groups;
        }


        /** @internal */
        public static function pcre(string $func, array $args)
        {
                $res = Callback::invokeSafe($func, $args, function (string $message) use ($args): void {
                        // compile-time error, not detectable by preg_last_error
                        throw new RegexpException($message . ' in pattern: ' . implode(' or ', (array) $args[0]));
                });

                if (($code = preg_last_error()) // run-time error, but preg_last_error & return code are liars
                        && ($res === null || !in_array($func, ['preg_filter', 'preg_replace_callback', 'preg_replace'], true))
                ) {
                        throw new RegexpException(preg_last_error_msg()
                                . ' (pattern: ' . implode(' or ', (array) $args[0]) . ')', $code);
                }

                return $res;
        }
}

nette / utils / 12277622433

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