384 lines
12 KiB
PHP
384 lines
12 KiB
PHP
<?php
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namespace dokuwiki\Utf8;
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/**
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* UTF-8 aware equivalents to PHP's string functions
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*/
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class PhpString
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{
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/**
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* A locale independent basename() implementation
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*
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* works around a bug in PHP's basename() implementation
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*
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* @param string $path A path
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* @param string $suffix If the name component ends in suffix this will also be cut off
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* @return string
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* @link https://bugs.php.net/bug.php?id=37738
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*
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* @see basename()
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*/
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public static function basename($path, $suffix = '')
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{
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$path = trim($path, '\\/');
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$rpos = max(strrpos($path, '/'), strrpos($path, '\\'));
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if ($rpos) {
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$path = substr($path, $rpos + 1);
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}
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$suflen = strlen($suffix);
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if ($suflen && (substr($path, -$suflen) === $suffix)) {
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$path = substr($path, 0, -$suflen);
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}
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return $path;
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}
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/**
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* Unicode aware replacement for strlen()
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*
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* utf8_decode() converts characters that are not in ISO-8859-1
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* to '?', which, for the purpose of counting, is alright - It's
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* even faster than mb_strlen.
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*
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* @param string $string
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* @return int
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* @see utf8_decode()
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*
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* @author <chernyshevsky at hotmail dot com>
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* @see strlen()
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*/
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public static function strlen($string)
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{
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if (function_exists('utf8_decode')) {
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return strlen(utf8_decode($string));
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}
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if (UTF8_MBSTRING) {
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return mb_strlen($string, 'UTF-8');
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}
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if (function_exists('iconv_strlen')) {
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return iconv_strlen($string, 'UTF-8');
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}
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return strlen($string);
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}
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/**
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* UTF-8 aware alternative to substr
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*
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* Return part of a string given character offset (and optionally length)
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*
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* @param string $str
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* @param int $offset number of UTF-8 characters offset (from left)
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* @param int $length (optional) length in UTF-8 characters from offset
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* @return string
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* @author Harry Fuecks <hfuecks@gmail.com>
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* @author Chris Smith <chris@jalakai.co.uk>
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*
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*/
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public static function substr($str, $offset, $length = null)
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{
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if (UTF8_MBSTRING) {
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if ($length === null) {
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return mb_substr($str, $offset);
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}
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return mb_substr($str, $offset, $length);
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}
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/*
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* Notes:
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*
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* no mb string support, so we'll use pcre regex's with 'u' flag
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* pcre only supports repetitions of less than 65536, in order to accept up to MAXINT values for
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* offset and length, we'll repeat a group of 65535 characters when needed (ok, up to MAXINT-65536)
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*
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* substr documentation states false can be returned in some cases (e.g. offset > string length)
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* mb_substr never returns false, it will return an empty string instead.
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*
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* calculating the number of characters in the string is a relatively expensive operation, so
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* we only carry it out when necessary. It isn't necessary for +ve offsets and no specified length
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*/
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// cast parameters to appropriate types to avoid multiple notices/warnings
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$str = (string)$str; // generates E_NOTICE for PHP4 objects, but not PHP5 objects
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$offset = (int)$offset;
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if ($length !== null) $length = (int)$length;
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// handle trivial cases
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if ($length === 0) return '';
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if ($offset < 0 && $length < 0 && $length < $offset) return '';
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$offset_pattern = '';
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$length_pattern = '';
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// normalise -ve offsets (we could use a tail anchored pattern, but they are horribly slow!)
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if ($offset < 0) {
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$strlen = self::strlen($str); // see notes
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$offset = $strlen + $offset;
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if ($offset < 0) $offset = 0;
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}
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// establish a pattern for offset, a non-captured group equal in length to offset
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if ($offset > 0) {
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$Ox = (int)($offset / 65535);
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$Oy = $offset % 65535;
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if ($Ox) $offset_pattern = '(?:.{65535}){' . $Ox . '}';
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$offset_pattern = '^(?:' . $offset_pattern . '.{' . $Oy . '})';
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} else {
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$offset_pattern = '^'; // offset == 0; just anchor the pattern
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}
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// establish a pattern for length
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if ($length === null) {
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$length_pattern = '(.*)$'; // the rest of the string
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} else {
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if (!isset($strlen)) $strlen = self::strlen($str); // see notes
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if ($offset > $strlen) return ''; // another trivial case
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if ($length > 0) {
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// reduce any length that would go past the end of the string
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$length = min($strlen - $offset, $length);
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$Lx = (int)($length / 65535);
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$Ly = $length % 65535;
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// +ve length requires ... a captured group of length characters
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if ($Lx) $length_pattern = '(?:.{65535}){' . $Lx . '}';
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$length_pattern = '(' . $length_pattern . '.{' . $Ly . '})';
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} else if ($length < 0) {
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if ($length < ($offset - $strlen)) return '';
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$Lx = (int)((-$length) / 65535);
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$Ly = (-$length) % 65535;
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// -ve length requires ... capture everything except a group of -length characters
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// anchored at the tail-end of the string
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if ($Lx) $length_pattern = '(?:.{65535}){' . $Lx . '}';
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$length_pattern = '(.*)(?:' . $length_pattern . '.{' . $Ly . '})$';
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}
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}
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if (!preg_match('#' . $offset_pattern . $length_pattern . '#us', $str, $match)) return '';
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return $match[1];
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}
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// phpcs:disable PSR1.Methods.CamelCapsMethodName.NotCamelCaps
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/**
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* Unicode aware replacement for substr_replace()
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*
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* @param string $string input string
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* @param string $replacement the replacement
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* @param int $start the replacing will begin at the start'th offset into string.
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* @param int $length If given and is positive, it represents the length of the portion of string which is
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* to be replaced. If length is zero then this function will have the effect of inserting
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* replacement into string at the given start offset.
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* @return string
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* @see substr_replace()
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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public static function substr_replace($string, $replacement, $start, $length = 0)
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{
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$ret = '';
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if ($start > 0) $ret .= self::substr($string, 0, $start);
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$ret .= $replacement;
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$ret .= self::substr($string, $start + $length);
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return $ret;
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}
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// phpcs:enable PSR1.Methods.CamelCapsMethodName.NotCamelCaps
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/**
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* Unicode aware replacement for ltrim()
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*
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* @param string $str
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* @param string $charlist
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* @return string
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* @see ltrim()
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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public static function ltrim($str, $charlist = '')
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{
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if ($charlist === '') return ltrim($str);
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//quote charlist for use in a characterclass
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$charlist = preg_replace('!([\\\\\\-\\]\\[/])!', '\\\${1}', $charlist);
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return preg_replace('/^[' . $charlist . ']+/u', '', $str);
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}
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/**
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* Unicode aware replacement for rtrim()
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*
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* @param string $str
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* @param string $charlist
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* @return string
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* @see rtrim()
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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public static function rtrim($str, $charlist = '')
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{
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if ($charlist === '') return rtrim($str);
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//quote charlist for use in a characterclass
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$charlist = preg_replace('!([\\\\\\-\\]\\[/])!', '\\\${1}', $charlist);
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return preg_replace('/[' . $charlist . ']+$/u', '', $str);
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}
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/**
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* Unicode aware replacement for trim()
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*
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* @param string $str
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* @param string $charlist
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* @return string
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* @see trim()
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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public static function trim($str, $charlist = '')
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{
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if ($charlist === '') return trim($str);
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return self::ltrim(self::rtrim($str, $charlist), $charlist);
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}
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/**
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* This is a unicode aware replacement for strtolower()
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*
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* Uses mb_string extension if available
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*
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* @param string $string
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* @return string
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* @see \dokuwiki\Utf8\PhpString::strtoupper()
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*
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* @author Leo Feyer <leo@typolight.org>
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* @see strtolower()
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*/
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public static function strtolower($string)
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{
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if (UTF8_MBSTRING) {
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if (class_exists('Normalizer', $autoload = false)) {
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return \Normalizer::normalize(mb_strtolower($string, 'utf-8'));
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}
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return (mb_strtolower($string, 'utf-8'));
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}
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return strtr($string, Table::upperCaseToLowerCase());
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}
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/**
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* This is a unicode aware replacement for strtoupper()
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*
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* Uses mb_string extension if available
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*
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* @param string $string
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* @return string
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* @see \dokuwiki\Utf8\PhpString::strtoupper()
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*
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* @author Leo Feyer <leo@typolight.org>
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* @see strtoupper()
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*/
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public static function strtoupper($string)
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{
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if (UTF8_MBSTRING) return mb_strtoupper($string, 'utf-8');
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return strtr($string, Table::lowerCaseToUpperCase());
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}
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/**
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* UTF-8 aware alternative to ucfirst
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* Make a string's first character uppercase
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*
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* @param string $str
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* @return string with first character as upper case (if applicable)
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* @author Harry Fuecks
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*
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*/
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public static function ucfirst($str)
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{
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switch (self::strlen($str)) {
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case 0:
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return '';
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case 1:
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return self::strtoupper($str);
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default:
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preg_match('/^(.{1})(.*)$/us', $str, $matches);
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return self::strtoupper($matches[1]) . $matches[2];
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}
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}
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/**
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* UTF-8 aware alternative to ucwords
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* Uppercase the first character of each word in a string
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*
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* @param string $str
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* @return string with first char of each word uppercase
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* @author Harry Fuecks
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* @see http://php.net/ucwords
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*
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*/
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public static function ucwords($str)
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{
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// Note: [\x0c\x09\x0b\x0a\x0d\x20] matches;
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// form feeds, horizontal tabs, vertical tabs, linefeeds and carriage returns
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// This corresponds to the definition of a "word" defined at http://php.net/ucwords
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$pattern = '/(^|([\x0c\x09\x0b\x0a\x0d\x20]+))([^\x0c\x09\x0b\x0a\x0d\x20]{1})[^\x0c\x09\x0b\x0a\x0d\x20]*/u';
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return preg_replace_callback(
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$pattern,
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function ($matches) {
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$leadingws = $matches[2];
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$ucfirst = self::strtoupper($matches[3]);
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$ucword = self::substr_replace(ltrim($matches[0]), $ucfirst, 0, 1);
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return $leadingws . $ucword;
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},
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$str
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);
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}
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/**
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* This is an Unicode aware replacement for strpos
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*
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* @param string $haystack
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* @param string $needle
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* @param integer $offset
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* @return integer
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* @author Leo Feyer <leo@typolight.org>
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* @see strpos()
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*
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*/
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public static function strpos($haystack, $needle, $offset = 0)
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{
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$comp = 0;
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$length = null;
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while ($length === null || $length < $offset) {
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$pos = strpos($haystack, $needle, $offset + $comp);
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if ($pos === false)
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return false;
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$length = self::strlen(substr($haystack, 0, $pos));
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if ($length < $offset)
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$comp = $pos - $length;
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}
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return $length;
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}
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}
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