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Editing: StringHelper.php

<?php

/**
 * Part of the Joomla Framework String Package
 *
 * @copyright  Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\String;

// PHP mbstring and iconv local configuration
@ini_set('default_charset', 'UTF-8');

/**
 * String handling class for UTF-8 data wrapping the phputf8 library. All functions assume the validity of UTF-8 strings.
 *
 * @since  1.3.0
 */
abstract class StringHelper
{
    /**
     * Increment styles.
     *
     * @var    array
     * @since  1.3.0
     */
    protected static $incrementStyles = [
        'dash' => [
            '#-(\d+)$#',
            '-%d',
        ],
        'default' => [
            ['#$(\d+)$$#', '#$\d+$$#'],
            [' (%d)', '(%d)'],
        ],
    ];

/**
     * Increments a trailing number in a string.
     *
     * Used to easily create distinct labels when copying objects. The method has the following styles:
     *
     * default: "Label" becomes "Label (2)"
     * dash:    "Label" becomes "Label-2"
     *
     * @param   string       $string  The source string.
     * @param   string|null  $style   The the style (default|dash).
     * @param   integer      $n       If supplied, this number is used for the copy, otherwise it is the 'next' number.
     *
     * @return  string  The incremented string.
     *
     * @since   1.3.0
     */
    public static function increment($string, $style = 'default', $n = 0)
    {
        $styleSpec = static::$incrementStyles[$style] ?? static::$incrementStyles['default'];

// Regular expression search and replace patterns.
        if (\is_array($styleSpec[0])) {
            $rxSearch  = $styleSpec[0][0];
            $rxReplace = $styleSpec[0][1];
        } else {
            $rxSearch = $rxReplace = $styleSpec[0];
        }

// New and old (existing) sprintf formats.
        if (\is_array($styleSpec[1])) {
            $newFormat = $styleSpec[1][0];
            $oldFormat = $styleSpec[1][1];
        } else {
            $newFormat = $oldFormat = $styleSpec[1];
        }

// Check if we are incrementing an existing pattern, or appending a new one.
        if (preg_match($rxSearch, $string, $matches)) {
            $n      = empty($n) ? (1 + (int) $matches[1]) : $n;
            $string = preg_replace($rxReplace, sprintf($oldFormat, $n), $string);
        } else {
            $n = empty($n) ? 2 : $n;
            $string .= sprintf($newFormat, $n);
        }

return $string;
    }

/**
     * Tests whether a string contains only 7bit ASCII bytes.
     *
     * You might use this to conditionally check whether a string needs handling as UTF-8 or not, potentially offering performance
     * benefits by using the native PHP equivalent if it's just ASCII e.g.;
     *
     * <code>
     * if (StringHelper::is_ascii($someString))
     * {
     *     // It's just ASCII - use the native PHP version
     *     $someString = strtolower($someString);
     * }
     * else
     * {
     *     $someString = StringHelper::strtolower($someString);
     * }
     * </code>
     *
     * @param   string  $str  The string to test.
     *
     * @return  boolean True if the string is all ASCII
     *
     * @since   1.3.0
     */
    public static function is_ascii($str)
    {
        return utf8_is_ascii($str);
    }

/**
     * UTF-8 aware alternative to ord()
     *
     * Returns the unicode ordinal for a character.
     *
     * @param   string  $chr  UTF-8 encoded character
     *
     * @return  integer Unicode ordinal for the character
     *
     * @link    https://www.php.net/ord
     * @since   1.4.0
     */
    public static function ord($chr)
    {
        return utf8_ord($chr);
    }

/**
     * UTF-8 aware alternative to strpos()
     *
     * Find position of first occurrence of a string.
     *
     * @param   string                $str     String being examined
     * @param   string                $search  String being searched for
     * @param   integer|null|boolean  $offset  Optional, specifies the position from which the search should be performed
     *
     * @return  integer|boolean  Number of characters before the first match or FALSE on failure
     *
     * @link    https://www.php.net/strpos
     * @since   1.3.0
     */
    public static function strpos($str, $search, $offset = false)
    {
        if ($offset === false) {
            return utf8_strpos($str, $search);
        }

return utf8_strpos($str, $search, $offset);
    }

/**
     * UTF-8 aware alternative to strrpos()
     *
     * Finds position of last occurrence of a string.
     *
     * @param   string   $str     String being examined.
     * @param   string   $search  String being searched for.
     * @param   integer  $offset  Offset from the left of the string.
     *
     * @return  integer|boolean  Number of characters before the last match or false on failure
     *
     * @link    https://www.php.net/strrpos
     * @since   1.3.0
     */
    public static function strrpos($str, $search, $offset = 0)
    {
        return utf8_strrpos($str, $search, $offset);
    }

/**
     * UTF-8 aware alternative to substr()
     *
     * Return part of a string given character offset (and optionally length).
     *
     * @param   string                $str     String being processed
     * @param   integer               $offset  Number of UTF-8 characters offset (from left)
     * @param   integer|null|boolean  $length  Optional length in UTF-8 characters from offset
     *
     * @return  string|boolean
     *
     * @link    https://www.php.net/substr
     * @since   1.3.0
     */
    public static function substr($str, $offset, $length = false)
    {
        if ($length === false) {
            return utf8_substr($str, $offset);
        }

return utf8_substr($str, $offset, $length);
    }

/**
     * UTF-8 aware alternative to strtolower()
     *
     * Make a string lowercase
     *
     * Note: The concept of a characters "case" only exists is some alphabets such as Latin, Greek, Cyrillic, Armenian and archaic Georgian - it does
     * not exist in the Chinese alphabet, for example. See Unicode Standard Annex #21: Case Mappings
     *
     * @param   string  $str  String being processed
     *
     * @return  string|boolean  Either string in lowercase or FALSE is UTF-8 invalid
     *
     * @link    https://www.php.net/strtolower
     * @since   1.3.0
     */
    public static function strtolower($str)
    {
        return utf8_strtolower($str);
    }

/**
     * UTF-8 aware alternative to strtoupper()
     *
     * Make a string uppercase
     *
     * Note: The concept of a characters "case" only exists is some alphabets such as Latin, Greek, Cyrillic, Armenian and archaic Georgian - it does
     * not exist in the Chinese alphabet, for example. See Unicode Standard Annex #21: Case Mappings
     *
     * @param   string  $str  String being processed
     *
     * @return  string|boolean  Either string in uppercase or FALSE is UTF-8 invalid
     *
     * @link    https://www.php.net/strtoupper
     * @since   1.3.0
     */
    public static function strtoupper($str)
    {
        return utf8_strtoupper($str);
    }

/**
     * UTF-8 aware alternative to strlen()
     *
     * Returns the number of characters in the string (NOT THE NUMBER OF BYTES).
     *
     * @param   string  $str  UTF-8 string.
     *
     * @return  integer  Number of UTF-8 characters in string.
     *
     * @link    https://www.php.net/strlen
     * @since   1.3.0
     */
    public static function strlen($str)
    {
        return utf8_strlen($str);
    }

/**
     * UTF-8 aware alternative to str_ireplace()
     *
     * Case-insensitive version of str_replace()
     *
     * @param   string|string[]       $search   String to search
     * @param   string|string[]       $replace  Existing string to replace
     * @param   string                $str      New string to replace with
     * @param   integer|null|boolean  $count    Optional count value to be passed by referene
     *
     * @return  string  UTF-8 String
     *
     * @link    https://www.php.net/str_ireplace
     * @since   1.3.0
     */
    public static function str_ireplace($search, $replace, $str, $count = null)
    {
        if ($count === false) {
            return utf8_ireplace($search, $replace, $str);
        }

return utf8_ireplace($search, $replace, $str, $count);
    }

/**
     * UTF-8 aware alternative to str_pad()
     *
     * Pad a string to a certain length with another string.
     * $padStr may contain multi-byte characters.
     *
     * @param   string   $input   The input string.
     * @param   integer  $length  If the value is negative, less than, or equal to the length of the input string, no padding takes place.
     * @param   string   $padStr  The string may be truncated if the number of padding characters can't be evenly divided by the string's length.
     * @param   integer  $type    The type of padding to apply
     *
     * @return  string
     *
     * @link    https://www.php.net/str_pad
     * @since   1.4.0
     */
    public static function str_pad($input, $length, $padStr = ' ', $type = STR_PAD_RIGHT)
    {
        return utf8_str_pad($input, $length, $padStr, $type);
    }

/**
     * UTF-8 aware alternative to str_split()
     *
     * Convert a string to an array.
     *
     * @param   string   $str       UTF-8 encoded string to process
     * @param   integer  $splitLen  Number to characters to split string by
     *
     * @return  array|string|boolean
     *
     * @link    https://www.php.net/str_split
     * @since   1.3.0
     */
    public static function str_split($str, $splitLen = 1)
    {
        return utf8_str_split($str, $splitLen);
    }

/**
     * UTF-8/LOCALE aware alternative to strcasecmp()
     *
     * A case insensitive string comparison.
     *
     * @param   string          $str1    string 1 to compare
     * @param   string          $str2    string 2 to compare
     * @param   string|boolean  $locale  The locale used by strcoll or false to use classical comparison
     *
     * @return  integer   Either < 0 if str1 is less than str2; > 0 if str1 is greater than str2, and 0 if they are equal.
     *
     * @link    https://www.php.net/strcasecmp
     * @link    https://www.php.net/strcoll
     * @link    https://www.php.net/setlocale
     * @since   1.3.0
     */
    public static function strcasecmp($str1, $str2, $locale = false)
    {
        if ($locale === false) {
            return utf8_strcasecmp($str1, $str2);
        }

// Get current locale
        $locale0 = setlocale(LC_COLLATE, '0');

if (!$locale = setlocale(LC_COLLATE, $locale)) {
            $locale = $locale0;
        }

// See if we have successfully set locale to UTF-8
        if (!stristr($locale, 'UTF-8') && stristr($locale, '_') && preg_match('~\.(\d+)$~', $locale, $m)) {
            $encoding = 'CP' . $m[1];
        } elseif (stristr($locale, 'UTF-8') || stristr($locale, 'utf8')) {
            $encoding = 'UTF-8';
        } else {
            $encoding = 'nonrecodable';
        }

// If we successfully set encoding it to utf-8 or encoding is sth weird don't recode
        if ($encoding == 'UTF-8' || $encoding == 'nonrecodable') {
            return strcoll(utf8_strtolower($str1), utf8_strtolower($str2));
        }

return strcoll(
            static::transcode(utf8_strtolower($str1), 'UTF-8', $encoding),
            static::transcode(utf8_strtolower($str2), 'UTF-8', $encoding)
        );
    }

/**
     * UTF-8/LOCALE aware alternative to strcmp()
     *
     * A case sensitive string comparison.
     *
     * @param   string  $str1    string 1 to compare
     * @param   string  $str2    string 2 to compare
     * @param   mixed   $locale  The locale used by strcoll or false to use classical comparison
     *
     * @return  integer  Either < 0 if str1 is less than str2; > 0 if str1 is greater than str2, and 0 if they are equal.
     *
     * @link    https://www.php.net/strcmp
     * @link    https://www.php.net/strcoll
     * @link    https://www.php.net/setlocale
     * @since   1.3.0
     */
    public static function strcmp($str1, $str2, $locale = false)
    {
        if ($locale) {
            // Get current locale
            $locale0 = setlocale(LC_COLLATE, '0');

if (!$locale = setlocale(LC_COLLATE, $locale)) {
                $locale = $locale0;
            }

// See if we have successfully set locale to UTF-8
            if (!stristr($locale, 'UTF-8') && stristr($locale, '_') && preg_match('~\.(\d+)$~', $locale, $m)) {
                $encoding = 'CP' . $m[1];
            } elseif (stristr($locale, 'UTF-8') || stristr($locale, 'utf8')) {
                $encoding = 'UTF-8';
            } else {
                $encoding = 'nonrecodable';
            }

// If we successfully set encoding it to utf-8 or encoding is sth weird don't recode
            if ($encoding == 'UTF-8' || $encoding == 'nonrecodable') {
                return strcoll($str1, $str2);
            }

return strcoll(static::transcode($str1, 'UTF-8', $encoding), static::transcode($str2, 'UTF-8', $encoding));
        }

return strcmp($str1, $str2);
    }

/**
     * UTF-8 aware alternative to strcspn()
     *
     * Find length of initial segment not matching mask.
     *
     * @param   string           $str     The string to process
     * @param   string           $mask    The mask
     * @param   integer|boolean  $start   Optional starting character position (in characters)
     * @param   integer|boolean  $length  Optional length
     *
     * @return  integer  The length of the initial segment of str1 which does not contain any of the characters in str2
     *
     * @link    https://www.php.net/strcspn
     * @since   1.3.0
     */
    public static function strcspn($str, $mask, $start = null, $length = null)
    {
        if ($start === false && $length === false) {
            return utf8_strcspn($str, $mask);
        }

if ($length === false) {
            return utf8_strcspn($str, $mask, $start);
        }

return utf8_strcspn($str, $mask, $start, $length);
    }

/**
     * UTF-8 aware alternative to stristr()
     *
     * Returns all of haystack from the first occurrence of needle to the end. Needle and haystack are examined in a case-insensitive manner to
     * find the first occurrence of a string using case insensitive comparison.
     *
     * @param   string  $str     The haystack
     * @param   string  $search  The needle
     *
     * @return  string|boolean
     *
     * @link    https://www.php.net/stristr
     * @since   1.3.0
     */
    public static function stristr($str, $search)
    {
        return utf8_stristr($str, $search);
    }

/**
     * UTF-8 aware alternative to strrev()
     *
     * Reverse a string.
     *
     * @param   string  $str  String to be reversed
     *
     * @return  string   The string in reverse character order
     *
     * @link    https://www.php.net/strrev
     * @since   1.3.0
     */
    public static function strrev($str)
    {
        return utf8_strrev($str);
    }

/**
     * UTF-8 aware alternative to strspn()
     *
     * Find length of initial segment matching mask.
     *
     * @param   string        $str     The haystack
     * @param   string        $mask    The mask
     * @param   integer|null  $start   Start optional
     * @param   integer|null  $length  Length optional
     *
     * @return  integer
     *
     * @link    https://www.php.net/strspn
     * @since   1.3.0
     */
    public static function strspn($str, $mask, $start = null, $length = null)
    {
        if ($start === null && $length === null) {
            return utf8_strspn($str, $mask);
        }

if ($length === null) {
            return utf8_strspn($str, $mask, $start);
        }

return utf8_strspn($str, $mask, $start, $length);
    }

/**
     * UTF-8 aware alternative to substr_replace()
     *
     * Replace text within a portion of a string.
     *
     * @param   string                $str     The haystack
     * @param   string                $repl    The replacement string
     * @param   integer               $start   Start
     * @param   integer|boolean|null  $length  Length (optional)
     *
     * @return  string
     *
     * @link    https://www.php.net/substr_replace
     * @since   1.3.0
     */
    public static function substr_replace($str, $repl, $start, $length = null)
    {
        // Loaded by library loader
        if ($length === false) {
            return utf8_substr_replace($str, $repl, $start);
        }

return utf8_substr_replace($str, $repl, $start, $length);
    }

/**
     * UTF-8 aware replacement for ltrim()
     *
     * Strip whitespace (or other characters) from the beginning of a string. You only need to use this if you are supplying the charlist
     * optional arg and it contains UTF-8 characters. Otherwise ltrim will work normally on a UTF-8 string.
     *
     * @param   string          $str       The string to be trimmed
     * @param   string|boolean  $charlist  The optional charlist of additional characters to trim
     *
     * @return  string  The trimmed string
     *
     * @link    https://www.php.net/ltrim
     * @since   1.3.0
     */
    public static function ltrim($str, $charlist = false)
    {
        if (empty($charlist) && $charlist !== false) {
            return $str;
        }

if ($charlist === false) {
            return utf8_ltrim($str);
        }

return utf8_ltrim($str, $charlist);
    }

/**
     * UTF-8 aware replacement for rtrim()
     *
     * Strip whitespace (or other characters) from the end of a string. You only need to use this if you are supplying the charlist
     * optional arg and it contains UTF-8 characters. Otherwise rtrim will work normally on a UTF-8 string.
     *
     * @param   string          $str       The string to be trimmed
     * @param   string|boolean  $charlist  The optional charlist of additional characters to trim
     *
     * @return  string  The trimmed string
     *
     * @link    https://www.php.net/rtrim
     * @since   1.3.0
     */
    public static function rtrim($str, $charlist = false)
    {
        if (empty($charlist) && $charlist !== false) {
            return $str;
        }

if ($charlist === false) {
            return utf8_rtrim($str);
        }

return utf8_rtrim($str, $charlist);
    }

/**
     * UTF-8 aware replacement for trim()
     *
     * Strip whitespace (or other characters) from the beginning and end of a string. You only need to use this if you are supplying the charlist
     * optional arg and it contains UTF-8 characters. Otherwise trim will work normally on a UTF-8 string
     *
     * @param   string          $str       The string to be trimmed
     * @param   string|boolean  $charlist  The optional charlist of additional characters to trim
     *
     * @return  string  The trimmed string
     *
     * @link    https://www.php.net/trim
     * @since   1.3.0
     */
    public static function trim($str, $charlist = false)
    {
        if (empty($charlist) && $charlist !== false) {
            return $str;
        }

if ($charlist === false) {
            return utf8_trim($str);
        }

return utf8_trim($str, $charlist);
    }

/**
     * UTF-8 aware alternative to ucfirst()
     *
     * Make a string's first character uppercase or all words' first character uppercase.
     *
     * @param   string       $str           String to be processed
     * @param   string|null  $delimiter     The words delimiter (null means do not split the string)
     * @param   string|null  $newDelimiter  The new words delimiter (null means equal to $delimiter)
     *
     * @return  string  If $delimiter is null, return the string with first character as upper case (if applicable)
     *                  else consider the string of words separated by the delimiter, apply the ucfirst to each words
     *                  and return the string with the new delimiter
     *
     * @link    https://www.php.net/ucfirst
     * @since   1.3.0
     */
    public static function ucfirst($str, $delimiter = null, $newDelimiter = null)
    {
        if ($delimiter === null) {
            return utf8_ucfirst($str);
        }

if ($newDelimiter === null) {
            $newDelimiter = $delimiter;
        }

return implode($newDelimiter, array_map('utf8_ucfirst', explode($delimiter, $str)));
    }

/**
     * UTF-8 aware alternative to ucwords()
     *
     * Uppercase the first character of each word in a string.
     *
     * @param   string  $str  String to be processed
     *
     * @return  string  String with first char of each word uppercase
     *
     * @link    https://www.php.net/ucwords
     * @since   1.3.0
     */
    public static function ucwords($str)
    {
        return utf8_ucwords($str);
    }

/**
     * Transcode a string.
     *
     * @param   string  $source        The string to transcode.
     * @param   string  $fromEncoding  The source encoding.
     * @param   string  $toEncoding    The target encoding.
     *
     * @return  string|null  The transcoded string, or null if the source was not a string.
     *
     * @link    https://bugs.php.net/bug.php?id=48147
     *
     * @since   1.3.0
     */
    public static function transcode($source, $fromEncoding, $toEncoding)
    {
        switch (ICONV_IMPL) {
            case 'glibc':
                return @iconv($fromEncoding, $toEncoding . '//TRANSLIT,IGNORE', $source);

case 'libiconv':
            default:
                return iconv($fromEncoding, $toEncoding . '//IGNORE//TRANSLIT', $source);
        }
    }

/**
     * Tests a string as to whether it's valid UTF-8 and supported by the Unicode standard.
     *
     * Note: this function has been modified to simple return true or false.
     *
     * @param   string  $str  UTF-8 encoded string.
     *
     * @return  boolean  true if valid
     *
     * @author  <hsivonen@iki.fi>
     * @link    https://hsivonen.fi/php-utf8/
     * @see     compliant
     * @since   1.3.0
     */
    public static function valid($str)
    {
        return utf8_is_valid($str);
    }

/**
     * Tests whether a string complies as UTF-8.
     *
     * This will be much faster than StringHelper::valid() but will pass five and six octet UTF-8 sequences, which are not supported by Unicode and
     * so cannot be displayed correctly in a browser. In other words it is not as strict as StringHelper::valid() but it's faster. If you use it to
     * validate user input, you place yourself at the risk that attackers will be able to inject 5 and 6 byte sequences (which may or may not be a
     * significant risk, depending on what you are are doing).
     *
     * @param   string  $str  UTF-8 string to check
     *
     * @return  boolean  TRUE if string is valid UTF-8
     *
     * @see     StringHelper::valid
     * @link    https://www.php.net/manual/en/reference.pcre.pattern.modifiers.php#54805
     * @since   1.3.0
     */
    public static function compliant($str)
    {
        return utf8_compliant($str);
    }

/**
     * Converts Unicode sequences to UTF-8 string.
     *
     * @param   string  $str  Unicode string to convert
     *
     * @return  string  UTF-8 string
     *
     * @since   1.3.0
     */
    public static function unicode_to_utf8($str)
    {
        if (\extension_loaded('mbstring')) {
            return preg_replace_callback(
                '/\\\\u([0-9a-fA-F]{4})/',
                static function ($match) {
                    return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');
                },
                $str
            );
        }

return $str;
    }

/**
     * Converts Unicode sequences to UTF-16 string.
     *
     * @param   string  $str  Unicode string to convert
     *
     * @return  string  UTF-16 string
     *
     * @since   1.3.0
     */
    public static function unicode_to_utf16($str)
    {
        if (\extension_loaded('mbstring')) {
            return preg_replace_callback(
                '/\\\\u([0-9a-fA-F]{4})/',
                static function ($match) {
                    return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UTF-16BE');
                },
                $str
            );
        }

return $str;
    }
}

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