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PKPString.inc.php
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PKPString.inc.php
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<?php
/**
* @file classes/core/PKPString.inc.php
*
* Copyright (c) 2014-2017 Simon Fraser University
* Copyright (c) 2000-2017 John Willinsky
* Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
*
* @class PKPString
* @ingroup core
*
* @brief String manipulation wrapper class.
*
*/
/*
* Perl-compatibile regular expression (PCRE) constants:
* These are defined application-wide for consistency
*/
/*
* RFC-2396 URIs
*
* Thanks to the PEAR Validation package (Tomas V.V.Cox <cox@idecnet.com>,
* Pierre-Alain Joye <pajoye@php.net>, Amir Mohammad Saied <amir@php.net>)
*
* Originally published under the "New BSD License"
* http://www.opensource.org/licenses/bsd-license.php
*/
define('PCRE_URI', '(?:([a-z][-+.a-z0-9]*):)?' . // Scheme
'(?://' .
'(?:((?:%[0-9a-f]{2}|[-a-z0-9_.!~*\'();:\&=+$,])*)@)?' . // User
'(?:((?:[a-z0-9](?:[-a-z0-9]*[a-z0-9])?\.)*[a-z](?:[a-z0-9]+)?\.?)' . // Hostname
'|([0-9]{1,3}(?:\.[0-9]{1,3}){3}))' . // IP Address
'(?::([0-9]*))?)' . // Port
'((?:/(?:%[0-9a-f]{2}|[-a-z0-9_.!~*\'():@\&=+$,;])*)*/?)?' . // Path
'(?:\?([^#]*))?' . // Query String
'(?:\#((?:%[0-9a-f]{2}|[-a-z0-9_.!~*\'();/?:@\&=+$,])*))?'); // Fragment
// RFC-2822 email addresses
define('PCRE_EMAIL_ADDRESS',
'[-a-z0-9!#\$%&\'\*\+\/=\?\^_\`\{\|\}~]' . '+' . // One or more atom characters.
'(\.' . '[-a-z0-9!#\$%&\'\*\+\/=\?\^_\`\{\|\}~]' . '+)*'. // Followed by zero or more dot separated sets of one or more atom characters.
'@'. // Followed by an "at" character.
'(' . '([a-z0-9]([-a-z0-9]*[a-z0-9]+)?)' . '{1,63}\.)+'. // Followed by one or max 63 domain characters (dot separated).
'([a-z0-9]([-a-z0-9]*[a-z0-9]+)?)' . '{2,63}' // Must be followed by one set consisting a period of two or max 63 domain characters.
);
// Two different types of camel case: one for class names and one for method names
define ('CAMEL_CASE_HEAD_UP', 0x01);
define ('CAMEL_CASE_HEAD_DOWN', 0x02);
class PKPString {
/**
* Perform initialization required for the string wrapper library.
* @return null
*/
static function init() {
$clientCharset = strtolower_codesafe(Config::getVar('i18n', 'client_charset'));
// Check if mbstring is installed (requires PHP >= 4.3.0)
if (self::hasMBString()) {
// mbstring routines are available
define('ENABLE_MBSTRING', true);
// Set up required ini settings for mbstring
// FIXME Do any other mbstring settings need to be set?
mb_internal_encoding($clientCharset);
mb_substitute_character('63'); // question mark
}
// Define modifier to be used in regexp_* routines
// FIXME Should non-UTF-8 encodings be supported with mbstring?
if ($clientCharset == 'utf-8' && self::hasPCREUTF8()) {
define('PCRE_UTF8', 'u');
} else {
define('PCRE_UTF8', '');
}
}
/**
* Check if server has the mbstring library.
* Currently requires PHP >= 4.3.0 (for mb_strtolower, mb_strtoupper,
* and mb_substr_count)
* @return boolean Returns true iff the server supports mbstring functions.
*/
static function hasMBString() {
static $hasMBString;
if (isset($hasMBString)) return $hasMBString;
// If string overloading is active, it will break many of the
// native implementations. mbstring.func_overload must be set
// to 0, 1 or 4 in php.ini (string overloading disabled).
if (ini_get('mbstring.func_overload') && defined('MB_OVERLOAD_STRING')) {
$hasMBString = false;
} else {
$hasMBString = (
extension_loaded('mbstring') &&
function_exists('mb_strlen') &&
function_exists('mb_strpos') &&
function_exists('mb_strrpos') &&
function_exists('mb_substr') &&
function_exists('mb_strtolower') &&
function_exists('mb_strtoupper') &&
function_exists('mb_substr_count') &&
function_exists('mb_send_mail')
);
}
return $hasMBString;
}
/**
* Check if server supports the PCRE_UTF8 modifier.
* @return boolean True iff the server supports the PCRE_UTF8 modifier.
*/
static function hasPCREUTF8() {
// The PCRE_UTF8 modifier is only supported on PHP >= 4.1.0 (*nix) or PHP >= 4.2.3 (win32)
// Evil check to see if PCRE_UTF8 is supported
if (@preg_match('//u', '')) {
return true;
} else {
return false;
}
}
//
// Wrappers for basic string manipulation routines.
// See the phputf8 documentation for usage.
//
/**
* @see http://ca.php.net/manual/en/function.strlen.php
* @param $string string Input string
* @return int String length
*/
static function strlen($string) {
if (defined('ENABLE_MBSTRING')) {
require_once './lib/pkp/lib/phputf8/mbstring/core.php';
} else {
require_once './lib/pkp/lib/phputf8/utils/unicode.php';
require_once './lib/pkp/lib/phputf8/native/core.php';
}
return utf8_strlen($string);
}
/**
* @see http://ca.php.net/manual/en/function.strpos.php
* @param $haystack string Input haystack to search
* @param $needle string Input needle to search for
* @param $offset int Offset at which to begin searching
* @return int Position of needle within haystack
*/
static function strpos($haystack, $needle, $offset = 0) {
if (defined('ENABLE_MBSTRING')) {
require_once './lib/pkp/lib/phputf8/mbstring/core.php';
} else {
require_once './lib/pkp/lib/phputf8/utils/unicode.php';
require_once './lib/pkp/lib/phputf8/native/core.php';
}
return utf8_strpos($haystack, $needle, $offset);
}
/**
* @see http://ca.php.net/manual/en/function.strrpos.php
* @param $haystack string Haystack to search
* @param $needle string Needle to search haystack for
* @return int String position of needle in haystack (starting from end of haystack)
*/
static function strrpos($haystack, $needle) {
if (defined('ENABLE_MBSTRING')) {
require_once './lib/pkp/lib/phputf8/mbstring/core.php';
} else {
require_once './lib/pkp/lib/phputf8/utils/unicode.php';
require_once './lib/pkp/lib/phputf8/native/core.php';
}
return utf8_strrpos($haystack, $needle);
}
/**
* @see http://ca.php.net/manual/en/function.substr.php
* @param $string string Subject to extract substring from
* @param $start int Position to start from
* @param $length int Length to extract, or false for entire string from start position
* @return string Substring of $string
*/
static function substr($string, $start, $length = false) {
if (defined('ENABLE_MBSTRING')) {
require_once './lib/pkp/lib/phputf8/mbstring/core.php';
} else {
require_once './lib/pkp/lib/phputf8/utils/unicode.php';
require_once './lib/pkp/lib/phputf8/native/core.php';
// The default length value for the native implementation
// differs
if ($length === false) $length = null;
}
return utf8_substr($string, $start, $length);
}
/**
* @see http://ca.php.net/manual/en/function.substr_replace.php
* @param $string string Source string to perform replacement upon
* @param $replacement string Replacement to move into $string
* @param $start int Start location for replacement
* @param $length int Number of characters to replace in source string with $replacement
* @return string String resulting from replacement
*/
static function substr_replace($string, $replacement, $start, $length = null) {
if (extension_loaded('mbstring') === true) {
$string_length = self::strlen($string);
if ($start < 0) {
$start = max(0, $string_length + $start);
} else if ($start > $string_length) {
$start = $string_length;
}
if ($length < 0) {
$length = max(0, $string_length - $start + $length);
} else if ((is_null($length) === true) || ($length > $string_length)) {
$length = $string_length;
}
if (($start + $length) > $string_length) {
$length = $string_length - $start;
}
return self::substr($string, 0, $start) . $replacement . self::substr($string, $start + $length, $string_length - $start - $length);
}
return (is_null($length) === true) ? substr_replace($string, $replacement, $start) : substr_replace($string, $replacement, $start, $length);
}
/**
* @see http://ca.php.net/manual/en/function.strtolower.php
* @param $string string Input string
* @return string Lower case version of input string
*/
static function strtolower($string) {
if (defined('ENABLE_MBSTRING')) {
require_once './lib/pkp/lib/phputf8/mbstring/core.php';
} else {
require_once './lib/pkp/lib/phputf8/utils/unicode.php';
require_once './lib/pkp/lib/phputf8/native/core.php';
}
return utf8_strtolower($string);
}
/**
* @see http://ca.php.net/manual/en/function.strtoupper.php
* @param $string string Input string
* @return string Upper case version of input string
*/
static function strtoupper($string) {
if (defined('ENABLE_MBSTRING')) {
require_once './lib/pkp/lib/phputf8/mbstring/core.php';
} else {
require_once './lib/pkp/lib/phputf8/utils/unicode.php';
require_once './lib/pkp/lib/phputf8/native/core.php';
}
return utf8_strtoupper($string);
}
/**
* @see http://ca.php.net/manual/en/function.ucfirst.php
* @param $string string Input string
* @return string ucfirst version of input string
*/
static function ucfirst($string) {
if (defined('ENABLE_MBSTRING')) {
require_once './lib/pkp/lib/phputf8/mbstring/core.php';
require_once './lib/pkp/lib/phputf8/ucfirst.php';
} else {
require_once './lib/pkp/lib/phputf8/utils/unicode.php';
require_once './lib/pkp/lib/phputf8/native/core.php';
require_once './lib/pkp/lib/phputf8/ucfirst.php';
}
return utf8_ucfirst($string);
}
/**
* @see http://ca.php.net/manual/en/function.substr_count.php
* @param $haystack string Input string to search
* @param $needle string String to search within $haystack for
* @return int Count of number of times $needle appeared in $haystack
*/
static function substr_count($haystack, $needle) {
if (defined('ENABLE_MBSTRING')) {
return mb_substr_count($haystack, $needle); // Requires PHP >= 4.3.0
} else {
return substr_count($haystack, $needle);
}
}
/**
* @see http://ca.php.net/manual/en/function.encode_mime_header.php
* @param $string string Input MIME header to encode.
* @return string Encoded MIME header.
*/
static function encode_mime_header($string) {
if (defined('ENABLE_MBSTRING')) {
return mb_encode_mimeheader($string, mb_internal_encoding(), 'B', MAIL_EOL);
} else {
return $string;
}
}
//
// Wrappers for PCRE-compatible regular expression routines.
// See the php.net documentation for usage.
//
/**
* @see http://ca.php.net/manual/en/function.regexp_quote.php
* @param $string string String to quote
* @param $delimiter string Delimiter for regular expression
* @return string Quoted equivalent of $string
*/
static function regexp_quote($string, $delimiter = '/') {
return preg_quote($string, $delimiter);
}
/**
* @see http://ca.php.net/manual/en/function.regexp_grep.php
* @param $pattern string Regular expression
* @param $input string Input string
* @return array
*/
static function regexp_grep($pattern, $input) {
if (PCRE_UTF8 && !self::utf8_compliant($input)) $input = self::utf8_bad_strip($input);
return preg_grep($pattern . PCRE_UTF8, $input);
}
/**
* @see http://ca.php.net/manual/en/function.regexp_match.php
* @param $pattern string Regular expression
* @param $subject string String to apply regular expression to
* @return int
*/
static function regexp_match($pattern, $subject) {
if (PCRE_UTF8 && !self::utf8_compliant($subject)) $subject = self::utf8_bad_strip($subject);
return preg_match($pattern . PCRE_UTF8, $subject);
}
/**
* @see http://ca.php.net/manual/en/function.regexp_match_get.php
* @param $pattern string Regular expression
* @param $subject string String to apply regular expression to
* @param $matches array Reference to receive matches
* @return int|boolean Returns 1 if the pattern matches given subject, 0 if it does not, or FALSE if an error occurred.
*/
static function regexp_match_get($pattern, $subject, &$matches) {
// NOTE: This function was created since PHP < 5.x does not support optional reference parameters
if (PCRE_UTF8 && !self::utf8_compliant($subject)) $subject = self::utf8_bad_strip($subject);
return preg_match($pattern . PCRE_UTF8, $subject, $matches);
}
/**
* @see http://ca.php.net/manual/en/function.regexp_match_all.php
* @param $pattern string Regular expression
* @param $subject string String to apply regular expression to
* @param $matches array Reference to receive matches
* @return int|boolean Returns number of full matches of given subject, or FALSE if an error occurred.
*/
static function regexp_match_all($pattern, $subject, &$matches) {
if (PCRE_UTF8 && !self::utf8_compliant($subject)) $subject = self::utf8_bad_strip($subject);
return preg_match_all($pattern . PCRE_UTF8, $subject, $matches);
}
/**
* @see http://ca.php.net/manual/en/function.regexp_replace.php
* @param $pattern string Regular expression
* @param $replacement string String to replace matches in $subject with
* @param $subject string String to apply regular expression to
* @param $limit int Number of replacements to perform, maximum, or -1 for no limit.
* @return mixed
*/
static function regexp_replace($pattern, $replacement, $subject, $limit = -1) {
if (PCRE_UTF8 && !self::utf8_compliant($subject)) $subject = self::utf8_bad_strip($subject);
return preg_replace($pattern . PCRE_UTF8, $replacement, $subject, $limit);
}
/**
* @see http://ca.php.net/manual/en/function.regexp_replace_callback.php
* @param $pattern string Regular expression
* @param $callback callback PHP callback to generate content to replace matches with
* @param $subject string String to apply regular expression to
* @param $limit int Number of replacements to perform, maximum, or -1 for no limit.
* @return mixed
*/
static function regexp_replace_callback($pattern, $callback, $subject, $limit = -1) {
if (PCRE_UTF8 && !self::utf8_compliant($subject)) $subject = self::utf8_bad_strip($subject);
return preg_replace_callback($pattern . PCRE_UTF8, $callback, $subject, $limit);
}
/**
* @see http://ca.php.net/manual/en/function.regexp_split.php
* @param $pattern string Regular expression
* @param $subject string String to apply regular expression to
* @param $limit int Number of times to match; -1 for unlimited
* @return array Resulting string segments
*/
static function regexp_split($pattern, $subject, $limit = -1) {
if (PCRE_UTF8 && !self::utf8_compliant($subject)) $subject = self::utf8_bad_strip($subject);
return preg_split($pattern . PCRE_UTF8, $subject, $limit);
}
/**
* @see http://ca.php.net/manual/en/function.mime_content_type.php
* @param $filename string Filename to test.
* @param $suggestedExtension string Suggested file extension (used for common misconfigurations)
* @return string Detected MIME type
*/
static function mime_content_type($filename, $suggestedExtension = '') {
$result = null;
if (function_exists('finfo_open')) {
$fi =& Registry::get('fileInfo', true, null);
if ($fi === null) {
$fi = finfo_open(FILEINFO_MIME, Config::getVar('finfo', 'mime_database_path'));
}
if ($fi !== false) {
$result = strtok(finfo_file($fi, $filename), ' ;');
}
}
if (!$result && function_exists('mime_content_type')) {
$result = mime_content_type($filename);
// mime_content_type appears to return a charset
// (erroneously?) in recent versions of PHP5
if (($i = strpos($result, ';')) !== false) {
$result = trim(substr($result, 0, $i));
}
}
if (!$result) {
// Fall back on an external "file" tool
$f = escapeshellarg($filename);
$result = trim(`file --brief --mime $f`);
// Make sure we just return the mime type.
if (($i = strpos($result, ';')) !== false) {
$result = trim(substr($result, 0, $i));
}
}
// Check ambiguous mimetypes against extension
$ext = array_pop(explode('.',$filename));
if ($suggestedExtension) {
$ext = $suggestedExtension;
}
// SUGGESTED_EXTENSION:DETECTED_MIME_TYPE => OVERRIDE_MIME_TYPE
$ambiguities = array(
'css:text/x-c' => 'text/css',
'css:text/plain' => 'text/css',
'xlsx:application/zip' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'xltx:application/zip' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
'potx:application/zip' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
'ppsx:application/zip' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
'pptx:application/zip' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
'sldx:application/zip' => 'application/vnd.openxmlformats-officedocument.presentationml.slide',
'docx:application/zip' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'dotx:application/zip' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
);
if (isset($ambiguities[strtolower($ext.':'.$result)])) {
$result = $ambiguities[strtolower($ext.':'.$result)];
}
return $result;
}
/**
* Strip unsafe HTML from the input text. Covers XSS attacks like scripts,
* onclick(...) attributes, javascript: urls, and special characters.
* @param $input string input string
* @return string
*/
static function stripUnsafeHtml($input) {
static $purifier;
if (!isset($purifier)) {
$config = HTMLPurifier_Config::createDefault();
$config->set('Core.Encoding', Config::getVar('i18n', 'client_charset'));
$config->set('HTML.Doctype', 'HTML 4.01 Transitional');
$config->set('HTML.Allowed', Config::getVar('security', 'allowed_html'));
$config->set('Cache.SerializerPath', 'cache');
$purifier = new HTMLPurifier($config);
}
return $purifier->purify($input);
}
/**
* Convert limited HTML into a string.
* @param $html string
* @return string
*/
static function html2text($html) {
$html = self::regexp_replace('/<[\/]?p>/', "\n", $html);
$html = self::regexp_replace('/<li>/', '• ', $html);
$html = self::regexp_replace('/<\/li>/', "\n", $html);
$html = self::regexp_replace('/<br[ ]?[\/]?>/', "\n", $html);
$html = html_entity_decode(strip_tags($html), ENT_COMPAT, 'UTF-8');
return $html;
}
//
// Wrappers for UTF-8 validation routines
// See the phputf8 documentation for usage.
//
/**
* Detect whether a string contains non-ascii multibyte sequences in the UTF-8 range
* @param $str string input string
* @return boolean
*/
static function utf8_is_valid($str) {
require_once './lib/pkp/lib/phputf8/utils/validation.php';
return utf8_is_valid($str);
}
/**
* Tests whether a string complies as UTF-8; faster and less strict than utf8_is_valid
* see lib/phputf8/utils/validation.php for more details
* @param $str string input string
* @return boolean
*/
static function utf8_compliant($str) {
require_once './lib/pkp/lib/phputf8/utils/validation.php';
return utf8_compliant($str);
}
/**
* Locates the first bad byte in a UTF-8 string returning it's byte index in the string
* @param $str string input string
* @return string
*/
static function utf8_bad_find($str) {
require_once './lib/pkp/lib/phputf8/utils/bad.php';
return utf8_bad_find($str);
}
/**
* Strips out any bad bytes from a UTF-8 string and returns the rest
* @param $str string input string
* @return string
*/
static function utf8_bad_strip($str) {
require_once './lib/pkp/lib/phputf8/utils/bad.php';
return utf8_bad_strip($str);
}
/**
* Replace bad bytes with an alternative character - ASCII character
* @param $str string input string
* @param $replace string optional
* @return string
*/
static function utf8_bad_replace($str, $replace = '?') {
require_once './lib/pkp/lib/phputf8/utils/bad.php';
return utf8_bad_replace($str, $replace);
}
/**
* Replace bad bytes with an alternative character - ASCII character
* @param $str string input string
* @return string
*/
static function utf8_strip_ascii_ctrl($str) {
require_once './lib/pkp/lib/phputf8/utils/ascii.php';
return utf8_strip_ascii_ctrl($str);
}
/**
* Normalize a string in an unknown (non-UTF8) encoding into a valid UTF-8 sequence
* @param $str string input string
* @return string
*/
static function utf8_normalize($str) {
import('lib.pkp.classes.core.Transcoder');
if (self::hasMBString()) {
// NB: CP-1252 often segfaults; we've left it out here but it will detect as 'ISO-8859-1'
$mb_encoding_order = 'UTF-8, UTF-7, ASCII, ISO-8859-1, EUC-JP, SJIS, eucJP-win, SJIS-win, JIS, ISO-2022-JP';
$detected_encoding = mb_detect_encoding($str, $mb_encoding_order, false);
} elseif (function_exists('iconv') && strlen(iconv('CP1252', 'UTF-8', $str)) != strlen(iconv('ISO-8859-1', 'UTF-8', $str))) {
// use iconv to detect CP-1252, assuming default ISO-8859-1
$detected_encoding = 'CP1252';
} else {
// assume ISO-8859-1, PHP default
$detected_encoding = 'ISO-8859-1';
}
// transcode CP-1252/ISO-8859-1 into HTML entities; this works because CP-1252 is mapped onto ISO-8859-1
if ('ISO-8859-1' == $detected_encoding || 'CP1252' == $detected_encoding) {
$trans = new Transcoder('CP1252', 'HTML-ENTITIES');
$str = $trans->trans($str);
}
// transcode from detected encoding to to UTF-8
$trans = new Transcoder($detected_encoding, 'UTF-8');
$str = $trans->trans($str);
return $str;
}
/**
* US-ASCII transliterations of Unicode text
* @param $str string input string
* @return string
*/
static function utf8_to_ascii($str) {
require_once('./lib/pkp/lib/phputf8/utf8_to_ascii.php');
return utf8_to_ascii($str);
}
/**
* Return an associative array of named->numeric HTML entities
* Required to support HTML functions without objects in PHP4/PHP5
* From php.net: function.get-html-translation-table.php
* @return string
*/
static function getHTMLEntities () {
// define the conversion table
$html_entities = array(
"Á" => "Á", "á" => "á", "Â" => "Â",
"â" => "â", "´" => "´", "Æ" => "Æ",
"æ" => "æ", "À" => "À", "à" => "à",
"ℵ" => "ℵ","Α" => "Α", "α" => "α",
"&" => "&", "∧" => "∧", "∠" => "∠",
"'" => "'", "Å" => "Å", "å" => "å",
"≈" => "≈", "Ã" => "Ã", "ã" => "ã",
"Ä" => "Ä", "ä" => "ä", "„" => "„",
"Β" => "Β", "β" => "β", "¦" => "¦",
"•" => "•", "∩" => "∩", "Ç" => "Ç",
"ç" => "ç", "¸" => "¸", "¢" => "¢",
"Χ" => "Χ", "χ" => "χ", "ˆ" => "^",
"♣" => "♣", "≅" => "≅", "©" => "©",
"↵" => "↵", "∪" => "∪", "¤" => "¤",
"†" => "†","‡" => "‡", "↓" => "↓",
"⇓" => "⇓", "°" => "°", "Δ" => "Δ",
"δ" => "δ", "♦" => "♦", "÷" => "÷",
"É" => "É", "é" => "é", "Ê" => "Ê",
"ê" => "ê", "È" => "È", "è" => "è",
"∅" => "∅", " " => " ", " " => " ",
"Ε" => "Ε","ε" => "ε","≡" => "≡",
"Η" => "Η", "η" => "η", "Ð" => "Ð",
"ð" => "ð", "Ë" => "Ë", "ë" => "ë",
"€" => "€", "∃" => "∃", "ƒ" => "ƒ",
"∀" => "∀","½" => "½", "¼" => "¼",
"¾" => "¾", "⁄" => "⁄", "Γ" => "Γ",
"γ" => "γ", "≥" => "≥", ">" => ">",
"↔" => "↔", "⇔" => "⇔", "♥" => "♥",
"…" => "…","Í" => "Í", "í" => "í",
"Î" => "Î", "î" => "î", "¡" => "¡",
"Ì" => "Ì", "ì" => "ì", "ℑ" => "ℑ",
"∞" => "∞", "∫" => "∫", "Ι" => "Ι",
"ι" => "ι", "¿" => "¿", "∈" => "∈",
"Ï" => "Ï", "ï" => "ï", "Κ" => "Κ",
"κ" => "κ", "Λ" => "Λ", "λ" => "λ",
"⟨" => "〈", "«" => "«", "←" => "←",
"⇐" => "⇐", "⌈" => "⌈",
"“" => "“", "≤" => "≤", "⌊" => "⌊",
"∗" => "∗","◊" => "◊", "‎" => "‎",
"‹" => "‹","‘" => "‘", "<" => "<",
"¯" => "¯", "—" => "—", "µ" => "µ",
"·" => "·", "−" => "-", "Μ" => "Μ",
"μ" => "μ", "∇" => "∇", " " => " ",
"–" => "–", "≠" => "≠", "∋" => "∋",
"¬" => "¬", "∉" => "∉", "⊄" => "⊄",
"Ñ" => "Ñ", "ñ" => "ñ", "Ν" => "Ν",
"ν" => "ν", "Ó" => "Ó", "ó" => "ó",
"Ô" => "Ô", "ô" => "ô", "Œ" => "Œ",
"œ" => "œ", "Ò" => "Ò", "ò" => "ò",
"‾" => "‾", "Ω" => "Ω", "ω" => "ω",
"Ο" => "Ο","ο" => "ο","⊕" => "⊕",
"∨" => "∨", "ª" => "ª", "º" => "º",
"Ø" => "Ø", "ø" => "ø", "Õ" => "Õ",
"õ" => "õ", "⊗" => "⊗","Ö" => "Ö",
"ö" => "ö", "¶" => "¶", "∂" => "∂",
"‰" => "‰","⊥" => "⊥", "Φ" => "Φ",
"φ" => "φ", "Π" => "Π", "π" => "π",
"ϖ" => "ϖ", "±" => "±", "£" => "£",
"′" => "′", "″" => "″", "∏" => "∏",
"∝" => "∝", "Ψ" => "Ψ", "ψ" => "ψ",
""" => """, "√" => "√", "⟩" => "〉",
"»" => "»", "→" => "→", "⇒" => "⇒",
"⌉" => "⌉", "”" => "”", "ℜ" => "ℜ",
"®" => "®", "⌋" => "⌋","Ρ" => "Ρ",
"ρ" => "ρ", "‏" => "‏", "›" => "›",
"’" => "’", "‚" => "‚", "Š" => "Š",
"š" => "š", "⋅" => "⋅", "§" => "§",
"­" => "­", "Σ" => "Σ", "σ" => "σ",
"ς" => "ς", "∼" => "∼", "♠" => "♠",
"⊂" => "⊂", "⊆" => "⊆", "∑" => "∑",
"¹" => "¹", "²" => "²", "³" => "³",
"⊃" => "⊃", "⊇" => "⊇", "ß" => "ß",
"Τ" => "Τ", "τ" => "τ", "∴" => "∴",
"Θ" => "Θ", "θ" => "θ", "ϑ" => "ϑ",
" " => " ","Þ" => "Þ", "þ" => "þ",
"˜" => "~", "×" => "×", "™" => "™",
"Ú" => "Ú", "ú" => "ú", "↑" => "↑",
"⇑" => "⇑", "Û" => "Û", "û" => "û",
"Ù" => "Ù", "ù" => "ù", "¨" => "¨",
"ϒ" => "ϒ", "Υ" => "Υ","υ" => "υ",
"Ü" => "Ü", "ü" => "ü", "℘" => "℘",
"Ξ" => "Ξ", "ξ" => "ξ", "Ý" => "Ý",
"ý" => "ý", "¥" => "¥", "ÿ" => "ÿ",
"Ÿ" => "Ÿ", "Ζ" => "Ζ", "ζ" => "ζ",
"‍" => "‍", "‌" => "‌"
);
return $html_entities;
}
/**
* Trim punctuation from a string
* @param $string string input string
* @return string the trimmed string
*/
static function trimPunctuation($string) {
return trim($string, ' ,.;:!?&()[]\\/');
}
/**
* Convert a string to proper title case
* @param $title string
* @return string
*/
static function titleCase($title) {
AppLocale::requireComponents(LOCALE_COMPONENT_PKP_COMMON);
$smallWords = explode(' ', __('common.titleSmallWords'));
$words = explode(' ', $title);
foreach ($words as $key => $word) {
if ($key == 0 or !in_array(self::strtolower($word), $smallWords)) {
$words[$key] = ucfirst(self::strtolower($word));
} else {
$words[$key] = self::strtolower($word);
}
}
$newTitle = implode(' ', $words);
return $newTitle;
}
/**
* Joins two title string fragments (in $fields) either with a
* space or a colon.
* @param $fields array
* @return string the joined string
*/
static function concatTitleFields($fields) {
// Set the characters that will avoid the use of
// a semicolon between title and subtitle.
$avoidColonChars = array('?', '!', '/', '&');
// if the first field ends in a character in $avoidColonChars,
// concat with a space, otherwise use a colon.
// Check for any of these characters in
// the last position of current full title value.
if (in_array(substr($fields[0], -1, 1), $avoidColonChars)) {
$fullTitle = join(' ', $fields);
} else {
$fullTitle = join(': ', $fields);
}
return $fullTitle;
}
/**
* Iterate over an array of delimiters and see whether
* it exists in the given input string. If so, then use
* it to explode the string into an array.
* @param $delimiters array
* @param $input string
* @return array
*/
static function iterativeExplode($delimiters, $input) {
// Run through the delimiters and try them out
// one by one.
foreach($delimiters as $delimiter) {
if (strstr($input, $delimiter) !== false) {
return explode($delimiter, $input);
}
}
// If none of the delimiters works then return
// the original string as an array.
return (array($input));
}
/**
* Transform "handler-class" to "HandlerClass"
* and "my-op" to "myOp".
* @param $string input string
* @param $type which kind of camel case?
* @return string the string in camel case
*/
static function camelize($string, $type = CAMEL_CASE_HEAD_UP) {
assert($type == CAMEL_CASE_HEAD_UP || $type == CAMEL_CASE_HEAD_DOWN);
// Transform "handler-class" to "HandlerClass" and "my-op" to "MyOp"
$string = str_replace(' ', '', ucwords(str_replace('-', ' ', $string)));
// Transform "MyOp" to "myOp"
if ($type == CAMEL_CASE_HEAD_DOWN) {
// lcfirst() is PHP>5.3, so use workaround
$string = strtolower(substr($string, 0, 1)).substr($string, 1);
}
return $string;
}
/**
* Transform "HandlerClass" to "handler-class"
* and "myOp" to "my-op".
* @param $string
* @return string
*/
static function uncamelize($string) {
assert(!empty($string));
// Transform "myOp" to "MyOp"
$string = ucfirst($string);
// Insert hyphens between words and return the string in lowercase
$words = array();
self::regexp_match_all('/[A-Z][a-z0-9]*/', $string, $words);
assert(isset($words[0]) && !empty($words[0]) && strlen(implode('', $words[0])) == strlen($string));
return strtolower(implode('-', $words[0]));
}
/**
* Calculate the differences between two strings and
* produce an array with three types of entries: added
* substrings, deleted substrings and unchanged substrings.
*
* The calculation is optimized to identify the common
* largest substring.
*
* The return value is an array of the following format:
*
* array(
* array( diff-type => substring ),
* array(...)
* )
*
* whereby diff-type can be one of:
* -1 = deletion
* 0 = common substring
* 1 = addition
*
* @param $originalString string
* @param $editedString string
* @return array
*/
static function diff($originalString, $editedString) {
// Split strings into character arrays (multi-byte compatible).
foreach(array('originalStringCharacters' => $originalString, 'editedStringCharacters' => $editedString) as $characterArrayName => $string) {
${$characterArrayName} = array();
self::regexp_match_all('/./', $string, ${$characterArrayName});
if (isset(${$characterArrayName}[0])) {
${$characterArrayName} = ${$characterArrayName}[0];
}
}
// Determine the length of the strings.
$originalStringLength = count($originalStringCharacters);
$editedStringLength = count($editedStringCharacters);
// Is there anything to compare?
if ($originalStringLength == 0 && $editedStringLength == 0) return array();
// Is the original string empty?
if ($originalStringLength == 0) {
// Return the edited string as addition.
return array(array(1 => $editedString));
}
// Is the edited string empty?
if ($editedStringLength == 0) {
// Return the original string as deletion.
return array(array(-1 => $originalString));
}
// Initialize the local indices:
// 1) Create a character index for the edited string.
$characterIndex = array();
for($characterPosition = 0; $characterPosition < $editedStringLength; $characterPosition++) {
$characterIndex[$editedStringCharacters[$characterPosition]][] = $characterPosition;
}
// 2) Initialize the substring and the length index.
$substringIndex = $lengthIndex = array();
// Iterate over the original string to identify
// the largest common string.
for($originalPosition = 0; $originalPosition < $originalStringLength; $originalPosition++) {
// Find all occurrences of the original character
// in the target string.
$comparedCharacter = $originalStringCharacters[$originalPosition];
// Do we have a commonality between the original string
// and the edited string?
if (isset($characterIndex[$comparedCharacter])) {
// Loop over all commonalities.
foreach($characterIndex[$comparedCharacter] as $editedPosition) {
// Calculate the current and the preceding position
// ids for indexation.
$currentPosition = $originalPosition . '-' . $editedPosition;
$previousPosition = ($originalPosition-1) . '-' . ($editedPosition-1);
// Does the occurrence in the target string continue
// an existing common substring or does it start
// a new one?
if (isset($substringIndex[$previousPosition])) {
// This is a continuation of an existing common
// substring...
$newSubstring = $substringIndex[$previousPosition].$comparedCharacter;
$newSubstringLength = self::strlen($newSubstring);
// Move the substring in the substring index.
$substringIndex[$currentPosition] = $newSubstring;
unset($substringIndex[$previousPosition]);
// Move the substring in the length index.
$lengthIndex[$newSubstringLength][$currentPosition] = $newSubstring;
unset($lengthIndex[$newSubstringLength - 1][$previousPosition]);
} else {
// Start a new common substring...
// Add the substring to the substring index.
$substringIndex[$currentPosition] = $comparedCharacter;
// Add the substring to the length index.
$lengthIndex[1][$currentPosition] = $comparedCharacter;
}
}
}
}
// If we have no commonalities at all then mark the original
// string as deleted and the edited string as added and
// return.
if (empty($lengthIndex)) {
return array(
array( -1 => $originalString ),
array( 1 => $editedString )
);
}
// Pop the largest common substrings from the length index.
end($lengthIndex);
$largestSubstringLength = key($lengthIndex);
// Take the first common substring if we have more than
// one substring with the same length.
// FIXME: Find a better heuristic for this decision.
reset($lengthIndex[$largestSubstringLength]);
$largestSubstringPosition = key($lengthIndex[$largestSubstringLength]);
list($largestSubstringEndOriginal, $largestSubstringEndEdited) = explode('-', $largestSubstringPosition);
$largestSubstring = $lengthIndex[$largestSubstringLength][$largestSubstringPosition];
// Add the largest common substring to the result set
$diffResult = array(array( 0 => $largestSubstring ));
// Prepend the diff of the substrings before the common substring
// to the result diff (by recursion).
$precedingSubstringOriginal = self::substr($originalString, 0, $largestSubstringEndOriginal-$largestSubstringLength+1);
$precedingSubstringEdited = self::substr($editedString, 0, $largestSubstringEndEdited-$largestSubstringLength+1);
$diffResult = array_merge(self::diff($precedingSubstringOriginal, $precedingSubstringEdited), $diffResult);
// Append the diff of the substrings after thr common substring
// to the result diff (by recursion).
$succeedingSubstringOriginal = self::substr($originalString, $largestSubstringEndOriginal+1);
$succeedingSubstringEdited = self::substr($editedString, $largestSubstringEndEdited+1);
$diffResult = array_merge($diffResult, self::diff($succeedingSubstringOriginal, $succeedingSubstringEdited));
// Return the array representing the diff.
return $diffResult;
}
/**
* Get a letter $steps places after 'A'
* @param $steps int
* @return string Letter
*/
static function enumerateAlphabetically($steps) {
return chr(ord('A') + $steps);
}
/**
* Create a new UUID (version 4)
* @return string
*/
function generateUUID() {
mt_srand((double)microtime()*10000);
$charid = strtoupper(md5(uniqid(rand(), true)));
$hyphen = '-';
$uuid = substr($charid, 0, 8).$hyphen