forked from extern/egroupware
683 lines
24 KiB
PHP
683 lines
24 KiB
PHP
<?php
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$GLOBALS['_HORDE_STRING_CHARSET'] = 'iso-8859-1';
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/**
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* The String:: class provides static methods for charset and locale safe
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* string manipulation.
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*
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* $Horde: framework/Util/String.php,v 1.43.6.31 2008/10/23 21:28:38 jan Exp $
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*
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* Copyright 2003-2008 The Horde Project (http://www.horde.org/)
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*
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* See the enclosed file COPYING for license information (LGPL). If you
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* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
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*
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* @author Jan Schneider <jan@horde.org>
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* @since Horde 3.0
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* @package Horde_Util
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*/
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class String {
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/**
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* Caches the result of extension_loaded() calls.
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*
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* @param string $ext The extension name.
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*
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* @return boolean Is the extension loaded?
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*
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* @see Util::extensionExists()
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*/
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function extensionExists($ext)
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{
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static $cache = array();
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if (!isset($cache[$ext])) {
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$cache[$ext] = extension_loaded($ext);
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}
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return $cache[$ext];
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}
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/**
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* Sets a default charset that the String:: methods will use if none is
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* explicitly specified.
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*
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* @param string $charset The charset to use as the default one.
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*/
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function setDefaultCharset($charset)
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{
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$GLOBALS['_HORDE_STRING_CHARSET'] = $charset;
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if (String::extensionExists('mbstring') &&
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function_exists('mb_regex_encoding')) {
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$old_error = error_reporting(0);
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mb_regex_encoding(String::_mbstringCharset($charset));
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error_reporting($old_error);
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}
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}
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/**
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* Converts a string from one charset to another.
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*
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* Works only if either the iconv or the mbstring extension
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* are present and best if both are available.
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* The original string is returned if conversion failed or none
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* of the extensions were available.
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*
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* @param mixed $input The data to be converted. If $input is an an array,
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* the array's values get converted recursively.
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* @param string $from The string's current charset.
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* @param string $to The charset to convert the string to. If not
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* specified, the global variable
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* $_HORDE_STRING_CHARSET will be used.
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*
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* @return mixed The converted input data.
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*/
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function convertCharset($input, $from, $to = null)
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{
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/* Don't bother converting numbers. */
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if (is_numeric($input)) {
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return $input;
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}
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/* Get the user's default character set if none passed in. */
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if (is_null($to)) {
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$to = $GLOBALS['_HORDE_STRING_CHARSET'];
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}
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/* If the from and to character sets are identical, return now. */
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$from = String::lower($from);
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$to = String::lower($to);
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if ($from == $to) {
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return $input;
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}
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if (is_array($input)) {
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$tmp = array();
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while (list($key, $val) = each($input)) {
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$tmp[String::_convertCharset($key, $from, $to)] = String::convertCharset($val, $from, $to);
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}
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return $tmp;
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}
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if (is_object($input)) {
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// PEAR_Error objects are almost guaranteed to contain recursion,
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// which will cause a segfault in PHP. We should never reach
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// this line, but add a check and a log message to help the devs
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// track down and fix this issue.
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if (is_a($input, 'PEAR_Error')) {
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Horde::logMessage('Called convertCharset() on a PEAR_Error object. ' . print_r($input, true), __FILE__, __LINE__, PEAR_LOG_DEBUG);
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return '';
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}
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$vars = get_object_vars($input);
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while (list($key, $val) = each($vars)) {
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$input->$key = String::convertCharset($val, $from, $to);
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}
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return $input;
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}
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if (!is_string($input)) {
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return $input;
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}
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return String::_convertCharset($input, $from, $to);
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}
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/**
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* Internal function used to do charset conversion.
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*
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* @access private
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*
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* @param string $input See String::convertCharset().
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* @param string $from See String::convertCharset().
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* @param string $to See String::convertCharset().
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*
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* @return string The converted string.
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*/
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function _convertCharset($input, $from, $to)
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{
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$output = '';
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$from_check = (($from == 'iso-8859-1') || ($from == 'us-ascii'));
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$to_check = (($to == 'iso-8859-1') || ($to == 'us-ascii'));
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/* Use utf8_[en|de]code() if possible and if the string isn't too
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* large (less than 16 MB = 16 * 1024 * 1024 = 16777216 bytes) - these
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* functions use more memory. */
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if (strlen($input) < 16777216 || !(String::extensionExists('iconv') || String::extensionExists('mbstring'))) {
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if ($from_check && ($to == 'utf-8')) {
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return utf8_encode($input);
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}
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if (($from == 'utf-8') && $to_check) {
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return utf8_decode($input);
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}
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}
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/* First try iconv with transliteration. */
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if (($from != 'utf7-imap') &&
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($to != 'utf7-imap') &&
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String::extensionExists('iconv')) {
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/* We need to tack an extra character temporarily because of a bug
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* in iconv() if the last character is not a 7 bit ASCII
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* character. */
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$oldTrackErrors = ini_set('track_errors', 1);
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unset($php_errormsg);
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$output = @iconv($from, $to . '//TRANSLIT', $input . 'x');
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$output = (isset($php_errormsg)) ? false : String::substr($output, 0, -1, $to);
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ini_set('track_errors', $oldTrackErrors);
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}
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/* Next try mbstring. */
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if (!$output && String::extensionExists('mbstring')) {
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$old_error = error_reporting(0);
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$output = mb_convert_encoding($input, $to, String::_mbstringCharset($from));
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error_reporting($old_error);
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}
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/* At last try imap_utf7_[en|de]code if appropriate. */
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if (!$output && String::extensionExists('imap')) {
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if ($from_check && ($to == 'utf7-imap')) {
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return @imap_utf7_encode($input);
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}
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if (($from == 'utf7-imap') && $to_check) {
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return @imap_utf7_decode($input);
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}
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}
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return (!$output) ? $input : $output;
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}
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/**
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* Makes a string lowercase.
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*
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* @param string $string The string to be converted.
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* @param boolean $locale If true the string will be converted based on a
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* given charset, locale independent else.
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* @param string $charset If $locale is true, the charset to use when
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* converting. If not provided the current charset.
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*
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* @return string The string with lowercase characters
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*/
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function lower($string, $locale = false, $charset = null)
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{
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static $lowers;
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if ($locale) {
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/* The existence of mb_strtolower() depends on the platform. */
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if (String::extensionExists('mbstring') &&
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function_exists('mb_strtolower')) {
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if (is_null($charset)) {
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$charset = $GLOBALS['_HORDE_STRING_CHARSET'];
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}
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$old_error = error_reporting(0);
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$ret = mb_strtolower($string, String::_mbstringCharset($charset));
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error_reporting($old_error);
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if (!empty($ret)) {
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return $ret;
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}
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}
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return strtolower($string);
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}
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if (!isset($lowers)) {
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$lowers = array();
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}
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if (!isset($lowers[$string])) {
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$language = setlocale(LC_CTYPE, 0);
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setlocale(LC_CTYPE, 'C');
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$lowers[$string] = strtolower($string);
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setlocale(LC_CTYPE, $language);
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}
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return $lowers[$string];
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}
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/**
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* Makes a string uppercase.
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*
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* @param string $string The string to be converted.
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* @param boolean $locale If true the string will be converted based on a
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* given charset, locale independent else.
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* @param string $charset If $locale is true, the charset to use when
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* converting. If not provided the current charset.
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*
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* @return string The string with uppercase characters
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*/
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function upper($string, $locale = false, $charset = null)
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{
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static $uppers;
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if ($locale) {
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/* The existence of mb_strtoupper() depends on the
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* platform. */
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if (function_exists('mb_strtoupper')) {
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if (is_null($charset)) {
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$charset = $GLOBALS['_HORDE_STRING_CHARSET'];
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}
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$old_error = error_reporting(0);
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$ret = mb_strtoupper($string, String::_mbstringCharset($charset));
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error_reporting($old_error);
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if (!empty($ret)) {
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return $ret;
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}
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}
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return strtoupper($string);
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}
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if (!isset($uppers)) {
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$uppers = array();
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}
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if (!isset($uppers[$string])) {
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$language = setlocale(LC_CTYPE, 0);
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setlocale(LC_CTYPE, 'C');
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$uppers[$string] = strtoupper($string);
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setlocale(LC_CTYPE, $language);
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}
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return $uppers[$string];
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}
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/**
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* Returns a string with the first letter capitalized if it is
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* alphabetic.
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*
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* @param string $string The string to be capitalized.
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* @param boolean $locale If true the string will be converted based on a
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* given charset, locale independent else.
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* @param string $charset The charset to use, defaults to current charset.
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*
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* @return string The capitalized string.
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*/
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function ucfirst($string, $locale = false, $charset = null)
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{
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if ($locale) {
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$first = String::substr($string, 0, 1, $charset);
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if (String::isAlpha($first, $charset)) {
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$string = String::upper($first, true, $charset) . String::substr($string, 1, null, $charset);
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}
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} else {
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$string = String::upper(substr($string, 0, 1), false) . substr($string, 1);
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}
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return $string;
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}
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/**
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* Returns part of a string.
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*
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* @param string $string The string to be converted.
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* @param integer $start The part's start position, zero based.
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* @param integer $length The part's length.
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* @param string $charset The charset to use when calculating the part's
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* position and length, defaults to current
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* charset.
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*
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* @return string The string's part.
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*/
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function substr($string, $start, $length = null, $charset = null)
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{
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if (is_null($length)) {
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$length = String::length($string, $charset) - $start;
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}
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if ($length == 0) {
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return '';
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}
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if (String::extensionExists('mbstring')) {
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if (is_null($charset)) {
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$charset = $GLOBALS['_HORDE_STRING_CHARSET'];
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}
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$old_error = error_reporting(0);
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$ret = mb_substr($string, $start, $length, String::_mbstringCharset($charset));
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error_reporting($old_error);
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if (!empty($ret)) {
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return $ret;
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}
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}
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return substr($string, $start, $length);
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}
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/**
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* Returns the character (not byte) length of a string.
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*
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* @param string $string The string to return the length of.
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* @param string $charset The charset to use when calculating the string's
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* length.
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*
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* @return string The string's part.
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*/
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function length($string, $charset = null)
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{
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if (is_null($charset)) {
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$charset = $GLOBALS['_HORDE_STRING_CHARSET'];
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}
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$charset = String::lower($charset);
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if ($charset == 'utf-8' || $charset == 'utf8') {
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return strlen(utf8_decode($string));
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}
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if (String::extensionExists('mbstring')) {
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$old_error = error_reporting(0);
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$ret = mb_strlen($string, String::_mbstringCharset($charset));
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error_reporting($old_error);
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if (!empty($ret)) {
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return $ret;
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}
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}
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return strlen($string);
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}
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/**
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* Returns the numeric position of the first occurrence of $needle
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* in the $haystack string.
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*
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* @param string $haystack The string to search through.
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* @param string $needle The string to search for.
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* @param integer $offset Allows to specify which character in haystack
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* to start searching.
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* @param string $charset The charset to use when searching for the
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* $needle string.
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*
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* @return integer The position of first occurrence.
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*/
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function pos($haystack, $needle, $offset = 0, $charset = null)
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{
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if (String::extensionExists('mbstring')) {
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if (is_null($charset)) {
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$charset = $GLOBALS['_HORDE_STRING_CHARSET'];
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}
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$track_errors = ini_set('track_errors', 1);
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$old_error = error_reporting(0);
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$ret = mb_strpos($haystack, $needle, $offset, String::_mbstringCharset($charset));
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error_reporting($old_error);
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ini_set('track_errors', $track_errors);
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if (!isset($php_errormsg)) {
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return $ret;
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}
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}
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return strpos($haystack, $needle, $offset);
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}
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/**
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* Returns a string padded to a certain length with another string.
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*
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* This method behaves exactly like str_pad but is multibyte safe.
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*
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* @param string $input The string to be padded.
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* @param integer $length The length of the resulting string.
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* @param string $pad The string to pad the input string with. Must
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* be in the same charset like the input string.
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* @param const $type The padding type. One of STR_PAD_LEFT,
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* STR_PAD_RIGHT, or STR_PAD_BOTH.
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* @param string $charset The charset of the input and the padding
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* strings.
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*
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* @return string The padded string.
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*/
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function pad($input, $length, $pad = ' ', $type = STR_PAD_RIGHT,
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$charset = null)
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{
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$mb_length = String::length($input, $charset);
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$sb_length = strlen($input);
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$pad_length = String::length($pad, $charset);
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/* Return if we already have the length. */
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if ($mb_length >= $length) {
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return $input;
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}
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/* Shortcut for single byte strings. */
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if ($mb_length == $sb_length && $pad_length == strlen($pad)) {
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return str_pad($input, $length, $pad, $type);
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}
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switch ($type) {
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case STR_PAD_LEFT:
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$left = $length - $mb_length;
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$output = String::substr(str_repeat($pad, ceil($left / $pad_length)), 0, $left, $charset) . $input;
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break;
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case STR_PAD_BOTH:
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$left = floor(($length - $mb_length) / 2);
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$right = ceil(($length - $mb_length) / 2);
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$output = String::substr(str_repeat($pad, ceil($left / $pad_length)), 0, $left, $charset) .
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$input .
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String::substr(str_repeat($pad, ceil($right / $pad_length)), 0, $right, $charset);
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break;
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case STR_PAD_RIGHT:
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$right = $length - $mb_length;
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$output = $input . String::substr(str_repeat($pad, ceil($right / $pad_length)), 0, $right, $charset);
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break;
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}
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return $output;
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}
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/**
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* Wraps the text of a message.
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*
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* @since Horde 3.2
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*
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* @param string $string String containing the text to wrap.
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* @param integer $width Wrap the string at this number of
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* characters.
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* @param string $break Character(s) to use when breaking lines.
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* @param boolean $cut Whether to cut inside words if a line
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* can't be wrapped.
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* @param string $charset Character set to use when breaking lines.
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* @param boolean $line_folding Whether to apply line folding rules per
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* RFC 822 or similar. The correct break
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* characters including leading whitespace
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* have to be specified too.
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*
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* @return string String containing the wrapped text.
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*/
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function wordwrap($string, $width = 75, $break = "\n", $cut = false,
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$charset = null, $line_folding = false)
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{
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/* Get the user's default character set if none passed in. */
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if (is_null($charset)) {
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$charset = $GLOBALS['_HORDE_STRING_CHARSET'];
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}
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$charset = String::_mbstringCharset($charset);
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$string = String::convertCharset($string, $charset, 'utf-8');
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$wrapped = '';
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while (String::length($string, 'utf-8') > $width) {
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$line = String::substr($string, 0, $width, 'utf-8');
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$string = String::substr($string, String::length($line, 'utf-8'), null, 'utf-8');
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// Make sure didn't cut a word, unless we want hard breaks anyway.
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if (!$cut && preg_match('/^(.+?)(\s|\r?\n)/u', $string, $match)) {
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$line .= $match[1];
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$string = String::substr($string, String::length($match[1], 'utf-8'), null, 'utf-8');
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}
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// Wrap at existing line breaks.
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if (preg_match('/^(.*?)(\r?\n)(.*)$/u', $line, $match)) {
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$wrapped .= $match[1] . $match[2];
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$string = $match[3] . $string;
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continue;
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}
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// Wrap at the last colon or semicolon followed by a whitespace if
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// doing line folding.
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if ($line_folding &&
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preg_match('/^(.*?)(;|:)(\s+.*)$/u', $line, $match)) {
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$wrapped .= $match[1] . $match[2] . $break;
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$string = $match[3] . $string;
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continue;
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}
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// Wrap at the last whitespace of $line.
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if ($line_folding) {
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$sub = '(.+[^\s])';
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} else {
|
|
$sub = '(.*)';
|
|
}
|
|
if (preg_match('/^' . $sub . '(\s+)(.*)$/u', $line, $match)) {
|
|
$wrapped .= $match[1] . $break;
|
|
$string = ($line_folding ? $match[2] : '') . $match[3] . $string;
|
|
continue;
|
|
}
|
|
// Hard wrap if necessary.
|
|
if ($cut) {
|
|
$wrapped .= String::substr($line, 0, $width, 'utf-8') . $break;
|
|
$string = String::substr($line, $width, null, 'utf-8') . $string;
|
|
continue;
|
|
}
|
|
$wrapped .= $line;
|
|
}
|
|
|
|
return String::convertCharset($wrapped . $string, 'utf-8', $charset);
|
|
}
|
|
|
|
/**
|
|
* Wraps the text of a message.
|
|
*
|
|
* @param string $text String containing the text to wrap.
|
|
* @param integer $length Wrap $text at this number of characters.
|
|
* @param string $break_char Character(s) to use when breaking lines.
|
|
* @param string $charset Character set to use when breaking lines.
|
|
* @param boolean $quote Ignore lines that are wrapped with the '>'
|
|
* character (RFC 2646)? If true, we don't
|
|
* remove any padding whitespace at the end of
|
|
* the string.
|
|
*
|
|
* @return string String containing the wrapped text.
|
|
*/
|
|
function wrap($text, $length = 80, $break_char = "\n", $charset = null,
|
|
$quote = false)
|
|
{
|
|
$paragraphs = array();
|
|
|
|
foreach (preg_split('/\r?\n/', $text) as $input) {
|
|
if ($quote && (strpos($input, '>') === 0)) {
|
|
$line = $input;
|
|
} else {
|
|
/* We need to handle the Usenet-style signature line
|
|
* separately; since the space after the two dashes is
|
|
* REQUIRED, we don't want to trim the line. */
|
|
if ($input != '-- ') {
|
|
$input = rtrim($input);
|
|
}
|
|
$line = String::wordwrap($input, $length, $break_char, false, $charset);
|
|
}
|
|
|
|
$paragraphs[] = $line;
|
|
}
|
|
|
|
return implode($break_char, $paragraphs);
|
|
}
|
|
|
|
/**
|
|
* Returns true if the every character in the parameter is an alphabetic
|
|
* character.
|
|
*
|
|
* @param $string The string to test.
|
|
* @param $charset The charset to use when testing the string.
|
|
*
|
|
* @return boolean True if the parameter was alphabetic only.
|
|
*/
|
|
function isAlpha($string, $charset = null)
|
|
{
|
|
if (!String::extensionExists('mbstring')) {
|
|
return ctype_alpha($string);
|
|
}
|
|
|
|
$charset = String::_mbstringCharset($charset);
|
|
$old_charset = mb_regex_encoding();
|
|
$old_error = error_reporting(0);
|
|
|
|
if ($charset != $old_charset) {
|
|
mb_regex_encoding($charset);
|
|
}
|
|
$alpha = !mb_ereg_match('[^[:alpha:]]', $string);
|
|
if ($charset != $old_charset) {
|
|
mb_regex_encoding($old_charset);
|
|
}
|
|
|
|
error_reporting($old_error);
|
|
|
|
return $alpha;
|
|
}
|
|
|
|
/**
|
|
* Returns true if ever character in the parameter is a lowercase letter in
|
|
* the current locale.
|
|
*
|
|
* @param $string The string to test.
|
|
* @param $charset The charset to use when testing the string.
|
|
*
|
|
* @return boolean True if the parameter was lowercase.
|
|
*/
|
|
function isLower($string, $charset = null)
|
|
{
|
|
return ((String::lower($string, true, $charset) === $string) &&
|
|
String::isAlpha($string, $charset));
|
|
}
|
|
|
|
/**
|
|
* Returns true if every character in the parameter is an uppercase letter
|
|
* in the current locale.
|
|
*
|
|
* @param string $string The string to test.
|
|
* @param string $charset The charset to use when testing the string.
|
|
*
|
|
* @return boolean True if the parameter was uppercase.
|
|
*/
|
|
function isUpper($string, $charset = null)
|
|
{
|
|
return ((String::upper($string, true, $charset) === $string) &&
|
|
String::isAlpha($string, $charset));
|
|
}
|
|
|
|
/**
|
|
* Performs a multibyte safe regex match search on the text provided.
|
|
*
|
|
* @since Horde 3.1
|
|
*
|
|
* @param string $text The text to search.
|
|
* @param array $regex The regular expressions to use, without perl
|
|
* regex delimiters (e.g. '/' or '|').
|
|
* @param string $charset The character set of the text.
|
|
*
|
|
* @return array The matches array from the first regex that matches.
|
|
*/
|
|
function regexMatch($text, $regex, $charset = null)
|
|
{
|
|
if (!empty($charset)) {
|
|
$regex = String::convertCharset($regex, $charset, 'utf-8');
|
|
$text = String::convertCharset($text, $charset, 'utf-8');
|
|
}
|
|
|
|
$matches = array();
|
|
foreach ($regex as $val) {
|
|
if (preg_match('/' . $val . '/u', $text, $matches)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!empty($charset)) {
|
|
$matches = String::convertCharset($matches, 'utf-8', $charset);
|
|
}
|
|
|
|
return $matches;
|
|
}
|
|
|
|
/**
|
|
* Workaround charsets that don't work with mbstring functions.
|
|
*
|
|
* @access private
|
|
*
|
|
* @param string $charset The original charset.
|
|
*
|
|
* @return string The charset to use with mbstring functions.
|
|
*/
|
|
function _mbstringCharset($charset)
|
|
{
|
|
/* mbstring functions do not handle the 'ks_c_5601-1987' &
|
|
* 'ks_c_5601-1989' charsets. However, these charsets are used, for
|
|
* example, by various versions of Outlook to send Korean characters.
|
|
* Use UHC (CP949) encoding instead. See, e.g.,
|
|
* http://lists.w3.org/Archives/Public/ietf-charsets/2001AprJun/0030.html */
|
|
if (in_array(String::lower($charset), array('ks_c_5601-1987', 'ks_c_5601-1989'))) {
|
|
$charset = 'UHC';
|
|
}
|
|
|
|
return $charset;
|
|
}
|
|
|
|
}
|