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1138 lines
47 KiB
1138 lines
47 KiB
<?php
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/* For licensing terms, see /license.txt */
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/**
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* File: internationalization_internal.lib.php
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* Main API extension library for Chamilo 1.8.7 LMS,
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* contains functions for internal use only.
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* License: GNU General Public License Version 3 (Free Software Foundation)
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* @author Ivan Tcholakov, <ivantcholakov@gmail.com>, 2009, 2010
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* @author More authors, mentioned in the correpsonding fragments of this source
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*
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* Note: All functions and data structures here are not to be used directly.
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* See the file internationalization.lib.php which contains the "public" API.
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* @package chamilo.library
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*/
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/**
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* Global variables used by some callback functions
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*/
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$_api_encoding = null;
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$_api_collator = null;
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/**
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* This function returns an array of those languages that can use Latin 1 encoding.
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* Appendix to "Language support"
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* @return array The array of languages that can use Latin 1 encoding (ISO-8859-15, ISO-8859-1, WINDOWS-1252, ...).
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* Note: The returned language identificators are purified, without suffixes.
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*/
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function _api_get_latin1_compatible_languages() {
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static $latin1_languages;
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if (!isset($latin1_languages)) {
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$latin1_languages = array();
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$encodings = & _api_non_utf8_encodings();
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foreach ($encodings as $key => $value) {
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if (api_is_latin1($value[0])) {
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$latin1_languages[] = $key;
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}
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}
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}
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return $latin1_languages;
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}
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/**
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* Appendix to "Language recognition"
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* Based on the publication:
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* W. B. Cavnar and J. M. Trenkle. N-gram-based text categorization.
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* Proceedings of SDAIR-94, 3rd Annual Symposium on Document Analysis
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* and Information Retrieval, 1994.
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* @link http://citeseer.ist.psu.edu/cache/papers/cs/810/http:zSzzSzwww.info.unicaen.frzSz~giguetzSzclassifzSzcavnar_trenkle_ngram.pdf/n-gram-based-text.pdf
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*/
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/**
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* Generates statistical, based on n-grams language profile from the given text.
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* @param string $string The input text. It should be UTF-8 encoded. Practically it should be at least 3000 characters long, 40000 characters size is for increased accuracy.
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* @param int $n_grams_max (optional) The size of the array of the generated n-grams.
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* @param int $n_max (optional) The limit if the number of characters that a n-gram may contain.
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* @return array An array that contains cunstructed n-grams, sorted in reverse order by their frequences. Frequences are not stored in the array.
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*/
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function _api_generate_n_grams(&$string, $encoding, $n_grams_max = 350, $n_max = 4) {
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if (empty($string)) {
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return array();
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}
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// We construct only lowercase n-grams if it is applicable for the given language.
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// Removing all puntuation and some other non-letter characters. Apostrophe characters stay.
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// Splitting the sample text into separate words.
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$words = preg_split('/_/u', preg_replace('/[\x00-\x1F\x20-\x26\x28-\x3E\?@\x5B-\x60{|}~\x7F]/u', '_', ' '.api_strtolower(api_utf8_encode($string, $encoding), 'UTF-8').' '), -1, PREG_SPLIT_NO_EMPTY);
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$prefix = '_'; // Beginning of a word.
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$suffix = str_repeat('_', $n_max); // End of a word. Only the last '_' stays.
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$n_grams = array(); // The array that will contain the constructed n-grams.
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foreach ($words as $word) {
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$k = api_strlen($word, 'UTF-8') + 1;
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$word = $prefix.$word.$suffix;
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for ($n = 1; $n <= $n_max; $n++) {
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for ($i = 0; $i < $k; $i++) {
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$n_gram = api_utf8_decode(api_substr($word, $i, $n, 'UTF-8'), $encoding);
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if (isset($n_grams[$n_gram])) {
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$n_grams[$n_gram]++;
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} else {
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$n_grams[$n_gram] = 1;
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}
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}
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}
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}
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// Sorting the n-grams in reverse order by their frequences.
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arsort($n_grams);
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// Reduction the number of n-grams.
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return array_keys(array_slice($n_grams, 0, $n_grams_max));
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}
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/**
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*
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* The value $max_delta = 80000 is good enough for speed and detection accuracy.
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* If you set the value of $max_delta too low, no language will be recognized.
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* $max_delta = 400 * 350 = 140000 is the best detection with lowest speed.
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*/
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function _api_compare_n_grams(&$n_grams, $encoding, $max_delta = LANGUAGE_DETECT_MAX_DELTA) {
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static $language_profiles;
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if (!isset($language_profiles)) {
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// Reading the language profile files from the internationalization database.
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$exceptions = array('.', '..', 'CVS', '.htaccess', '.svn', '_svn', 'index.html');
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$path = str_replace("\\", '/', dirname(__FILE__).'/internationalization_database/language_detection/language_profiles/');
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$non_utf8_encodings = & _api_non_utf8_encodings();
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if (is_dir($path)) {
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if ($handle = @opendir($path)) {
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while (($dir_entry = @readdir($handle)) !== false) {
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if (api_in_array_nocase($dir_entry, $exceptions)) continue;
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if (strpos($dir_entry, '.txt') === false) continue;
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$dir_entry_full_path = $path .'/'. $dir_entry;
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if (@filetype($dir_entry_full_path) != 'dir') {
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if (false !== $data = @file_get_contents($dir_entry_full_path)) {
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$language = basename($dir_entry_full_path, '.txt');
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$encodings = array('UTF-8');
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if (!empty($non_utf8_encodings[$language])) {
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$encodings = array_merge($encodings, $non_utf8_encodings[$language]);
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}
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foreach ($encodings as $enc) {
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$data_enc = api_utf8_decode($data, $enc);
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if (empty($data_enc)) {
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continue;
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}
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$key = $language.':'.$enc;
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$language_profiles[$key]['data'] = array_flip(explode("\n", $data_enc));
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$language_profiles[$key]['language'] = $language;
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$language_profiles[$key]['encoding'] = $enc;
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}
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}
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}
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}
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}
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}
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@closedir($handle);
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ksort($language_profiles);
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}
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if (!is_array($n_grams) || empty($n_grams)) {
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return array();
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}
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// Comparison between the input n-grams and the lanuage profiles.
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foreach ($language_profiles as $key => &$language_profile) {
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if (!api_is_language_supported($language_profile['language']) || !api_equal_encodings($encoding, $language_profile['encoding'])) {
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continue;
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}
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$delta = 0; // This is a summary measurment for matching between the input text and the current language profile.
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// Searching each n-gram from the input text into the language profile.
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foreach ($n_grams as $rank => &$n_gram) {
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if (isset($language_profile['data'][$n_gram])) {
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// The n-gram has been found, the difference between places in both
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// arrays is calculated (so called delta-points are adopted for
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// measuring distances between n-gram ranks.
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$delta += abs($rank - $language_profile['data'][$n_gram]);
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} else {
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// The n-gram has not been found in the profile. We add then
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// a large enough "distance" in delta-points.
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$delta += 400;
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}
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// Abort: This language already differs too much.
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if ($delta > $max_delta) {
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break;
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}
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}
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// Include only non-aborted languages in result array.
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if ($delta < ($max_delta - 400)) {
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$result[$key] = $delta;
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}
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}
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if (!isset($result)) {
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return array();
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}
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asort($result);
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return $result;
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}
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/**
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* Appendix to "Date and time formats"
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*/
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/**
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* Returns an array of translated week days and months, short and normal names.
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* @param string $language (optional) Language indentificator. If it is omited, the current interface language is assumed.
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* @return array Returns a multidimensional array with translated week days and months.
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*/
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function &_api_get_day_month_names($language = null) {
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static $date_parts = array();
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if (empty($language)) {
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$language = api_get_interface_language();
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}
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if (!isset($date_parts[$language])) {
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$week_day = array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday');
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$month = array('January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December');
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for ($i = 0; $i < 7; $i++) {
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$date_parts[$language]['days_short'][] = get_lang($week_day[$i].'Short', '', $language);
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$date_parts[$language]['days_long'][] = get_lang($week_day[$i].'Long', '', $language);
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}
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for ($i = 0; $i < 12; $i++) {
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$date_parts[$language]['months_short'][] = get_lang($month[$i].'Short', '', $language);
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$date_parts[$language]['months_long'][] = get_lang($month[$i].'Long', '', $language);
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}
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}
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return $date_parts[$language];
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}
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/**
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* Returns returns person name convention for a given language.
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* @param string $language The input language.
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* @param string $type The type of the requested convention.
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* It may be 'format' for name order convention or 'sort_by' for name sorting convention.
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* @return mixed Depending of the requested type,
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* the returned result may be string or boolean; null is returned on error;
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*/
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function _api_get_person_name_convention($language, $type)
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{
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static $conventions;
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$language = api_purify_language_id($language);
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if (!isset($conventions)) {
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$file = dirname(__FILE__).'/internationalization_database/name_order_conventions.php';
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if (file_exists($file)) {
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$conventions = include ($file);
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} else {
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$conventions = array(
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'english' => array(
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'format' => 'title first_name last_name',
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'sort_by' => 'first_name'
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)
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);
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}
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// Overwrite classic conventions
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$customConventions = api_get_configuration_value('name_order_conventions');
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if (!empty($customConventions)) {
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foreach ($customConventions as $key => $data) {
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$conventions[$key] = $data;
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}
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}
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$search1 = array('FIRST_NAME', 'LAST_NAME', 'TITLE');
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$replacement1 = array('%F', '%L', '%T');
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$search2 = array('first_name', 'last_name', 'title');
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$replacement2 = array('%f', '%l', '%t');
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foreach (array_keys($conventions) as $key) {
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$conventions[$key]['format'] = str_replace($search1, $replacement1, $conventions[$key]['format']);
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$conventions[$key]['format'] = _api_validate_person_name_format(_api_clean_person_name(str_replace('%', ' %', str_ireplace($search2, $replacement2, $conventions[$key]['format']))));
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$conventions[$key]['sort_by'] = strtolower($conventions[$key]['sort_by']) != 'last_name' ? true : false;
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}
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}
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switch ($type) {
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case 'format':
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return is_string($conventions[$language]['format']) ? $conventions[$language]['format'] : '%t %f %l';
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case 'sort_by':
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return is_bool($conventions[$language]['sort_by']) ? $conventions[$language]['sort_by'] : true;
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}
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return null;
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}
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/**
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* Replaces non-valid formats for person names with the default (English) format.
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* @param string $format The input format to be verified.
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* @return bool Returns the same format if is is valid, otherwise returns a valid English format.
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*/
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function _api_validate_person_name_format($format) {
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if (empty($format) || stripos($format, '%f') === false || stripos($format, '%l') === false) {
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return '%t %f %l';
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}
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return $format;
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}
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/**
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* Removes leading, trailing and duplicate whitespace and/or commas in a full person name.
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* Cleaning is needed for the cases when not all parts of the name are available or when the name is constructed using a "dirty" pattern.
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* @param string $person_name The input person name.
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* @return string Returns cleaned person name.
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*/
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function _api_clean_person_name($person_name) {
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return preg_replace(array('/\s+/', '/, ,/', '/,+/', '/^[ ,]/', '/[ ,]$/'), array(' ', ', ', ',', '', ''), $person_name);
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}
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/**
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* Appendix to "Multibyte string conversion functions"
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*/
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/**
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* This is a php-implementation of a function that is similar to mb_convert_encoding() from mbstring extension.
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* The function converts a given string from one to another character encoding.
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* @param string $string The string being converted.
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* @param string $to_encoding The encoding that $string is being converted to.
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* @param string $from_encoding The encoding that $string is being converted from.
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* @return string Returns the converted string.
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*/
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function _api_convert_encoding(&$string, $to_encoding, $from_encoding) {
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$str = (string)$string;
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static $character_map = array();
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static $utf8_compatible = array('UTF-8', 'US-ASCII');
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if (empty($str)) {
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return $str;
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}
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$to_encoding = api_refine_encoding_id($to_encoding);
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$from_encoding = api_refine_encoding_id($from_encoding);
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if (api_equal_encodings($to_encoding, $from_encoding)) {
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return $str;
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}
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if ($to_encoding == 'HTML-ENTITIES') {
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return api_htmlentities($str, ENT_QUOTES, $from_encoding);
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}
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if ($from_encoding == 'HTML-ENTITIES') {
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return api_html_entity_decode($str, ENT_QUOTES, $to_encoding);
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}
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$to = _api_get_character_map_name($to_encoding);
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$from = _api_get_character_map_name($from_encoding);
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if (empty($to) || empty($from) || $to == $from || (in_array($to, $utf8_compatible) && in_array($from, $utf8_compatible))) {
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return $str;
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}
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if (!isset($character_map[$to])) {
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$character_map[$to] = &_api_parse_character_map($to);
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}
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if ($character_map[$to] === false) {
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return $str;
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}
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if (!isset($character_map[$from])) {
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$character_map[$from] = &_api_parse_character_map($from);
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}
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if ($character_map[$from] === false) {
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return $str;
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}
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if ($from != 'UTF-8') {
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$len = api_byte_count($str);
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$codepoints = array();
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for ($i = 0; $i < $len; $i++) {
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$ord = ord($str[$i]);
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if ($ord > 127) {
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if (isset($character_map[$from]['local'][$ord])) {
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$codepoints[] = $character_map[$from]['local'][$ord];
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} else {
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$codepoints[] = 0xFFFD; // U+FFFD REPLACEMENT CHARACTER is the general substitute character in the Unicode Standard.
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}
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} else {
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$codepoints[] = $ord;
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}
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}
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} else {
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$codepoints = _api_utf8_to_unicode($str);
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}
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if ($to != 'UTF-8') {
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foreach ($codepoints as $i => &$codepoint) {
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if ($codepoint > 127) {
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if (isset($character_map[$to]['unicode'][$codepoint])) {
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$codepoint = chr($character_map[$to]['unicode'][$codepoint]);
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} else {
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$codepoint = '?'; // Unknown character.
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}
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} else {
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$codepoint = chr($codepoint);
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}
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}
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$str = implode($codepoints);
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} else {
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$str = _api_utf8_from_unicode($codepoints);
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}
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return $str;
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}
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/**
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* This function determines the name of corresponding to a given encoding conversion table.
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* It is able to deal with some aliases of the encoding.
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* @param string $encoding The given encoding identificator, for example 'WINDOWS-1252'.
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* @return string Returns the name of the corresponding conversion table, for the same example - 'CP1252'.
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*/
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function _api_get_character_map_name($encoding) {
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static $character_map_selector;
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if (!isset($character_map_selector)) {
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$file = dirname(__FILE__).'/internationalization_database/conversion/character_map_selector.php';
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if (file_exists($file)) {
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$character_map_selector = include ($file);
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} else {
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$character_map_selector = array();
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}
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}
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return isset($character_map_selector[$encoding]) ? $character_map_selector[$encoding] : '';
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}
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|
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/**
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* This function parses a given conversion table (a text file) and creates in the memory
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* two tables for conversion - character set from/to Unicode codepoints.
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* @param string $name The name of the thext file that contains the conversion table, for example 'CP1252' (file CP1252.TXT will be parsed).
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* @return array Returns an array that contains forward and reverse tables (from/to Unicode).
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*/
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function &_api_parse_character_map($name) {
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$result = array();
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$file = dirname(__FILE__).'/internationalization_database/conversion/' . $name . '.TXT';
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if (file_exists($file)) {
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$text = @file_get_contents($file);
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if ($text !== false) {
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$text = explode(chr(10), $text);
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foreach ($text as $line) {
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if (empty($line)) {
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continue;
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}
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if (!empty($line) && trim($line) && $line[0] != '#') {
|
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$matches = array();
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preg_match('/[[:space:]]*0x([[:alnum:]]*)[[:space:]]+0x([[:alnum:]]*)[[:space:]]+/', $line, $matches);
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$ord = hexdec(trim($matches[1]));
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if ($ord > 127) {
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$codepoint = hexdec(trim($matches[2]));
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$result['local'][$ord] = $codepoint;
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$result['unicode'][$codepoint] = $ord;
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}
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}
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}
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} else {
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return false ;
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}
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} else {
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return false;
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}
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return $result;
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}
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|
|
/**
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* Takes an UTF-8 string and returns an array of integer values representing the Unicode characters.
|
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* Astral planes are supported ie. the ints in the output can be > 0xFFFF. Occurrances of the BOM are ignored.
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* Surrogates are not allowed.
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* @param string $string The UTF-8 encoded string.
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* @return array Returns an array of unicode code points.
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* @author Henri Sivonen, mailto:hsivonen@iki.fi
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* @link http://hsivonen.iki.fi/php-utf8/
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* @author Ivan Tcholakov, August 2009, adaptation for the Dokeos LMS.
|
|
*/
|
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function _api_utf8_to_unicode(&$string) {
|
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$str = (string)$string;
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$state = 0; // cached expected number of octets after the current octet
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// until the beginning of the next UTF8 character sequence
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$codepoint = 0; // cached Unicode character
|
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$bytes = 1; // cached expected number of octets in the current sequence
|
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$result = array();
|
|
$len = api_byte_count($str);
|
|
for ($i = 0; $i < $len; $i++) {
|
|
$byte = ord($str[$i]);
|
|
if ($state == 0) {
|
|
// When state is zero we expect either a US-ASCII character or a multi-octet sequence.
|
|
if (0 == (0x80 & ($byte))) {
|
|
// US-ASCII, pass straight through.
|
|
$result[] = $byte;
|
|
$bytes = 1;
|
|
} else if (0xC0 == (0xE0 & ($byte))) {
|
|
// First octet of 2 octet sequence
|
|
$codepoint = ($byte);
|
|
$codepoint = ($codepoint & 0x1F) << 6;
|
|
$state = 1;
|
|
$bytes = 2;
|
|
} else if (0xE0 == (0xF0 & ($byte))) {
|
|
// First octet of 3 octet sequence
|
|
$codepoint = ($byte);
|
|
$codepoint = ($codepoint & 0x0F) << 12;
|
|
$state = 2;
|
|
$bytes = 3;
|
|
} else if (0xF0 == (0xF8 & ($byte))) {
|
|
// First octet of 4 octet sequence
|
|
$codepoint = ($byte);
|
|
$codepoint = ($codepoint & 0x07) << 18;
|
|
$state = 3;
|
|
$bytes = 4;
|
|
} else if (0xF8 == (0xFC & ($byte))) {
|
|
// First octet of 5 octet sequence.
|
|
// This is illegal because the encoded codepoint must be either
|
|
// (a) not the shortest form or
|
|
// (b) outside the Unicode range of 0-0x10FFFF.
|
|
// Rather than trying to resynchronize, we will carry on until the end
|
|
// of the sequence and let the later error handling code catch it.
|
|
$codepoint = ($byte);
|
|
$codepoint = ($codepoint & 0x03) << 24;
|
|
$state = 4;
|
|
$bytes = 5;
|
|
} else if (0xFC == (0xFE & ($byte))) {
|
|
// First octet of 6 octet sequence, see comments for 5 octet sequence.
|
|
$codepoint = ($byte);
|
|
$codepoint = ($codepoint & 1) << 30;
|
|
$state = 5;
|
|
$bytes = 6;
|
|
} else {
|
|
// Current octet is neither in the US-ASCII range nor a legal first octet of a multi-octet sequence.
|
|
$state = 0;
|
|
$codepoint = 0;
|
|
$bytes = 1;
|
|
$result[] = 0xFFFD; // U+FFFD REPLACEMENT CHARACTER is the general substitute character in the Unicode Standard.
|
|
continue ;
|
|
}
|
|
} else {
|
|
// When state is non-zero, we expect a continuation of the multi-octet sequence
|
|
if (0x80 == (0xC0 & ($byte))) {
|
|
// Legal continuation.
|
|
$shift = ($state - 1) * 6;
|
|
$tmp = $byte;
|
|
$tmp = ($tmp & 0x0000003F) << $shift;
|
|
$codepoint |= $tmp;
|
|
// End of the multi-octet sequence. $codepoint now contains the final Unicode codepoint to be output
|
|
if (0 == --$state) {
|
|
// Check for illegal sequences and codepoints.
|
|
// From Unicode 3.1, non-shortest form is illegal
|
|
if (((2 == $bytes) && ($codepoint < 0x0080)) ||
|
|
((3 == $bytes) && ($codepoint < 0x0800)) ||
|
|
((4 == $bytes) && ($codepoint < 0x10000)) ||
|
|
(4 < $bytes) ||
|
|
// From Unicode 3.2, surrogate characters are illegal
|
|
(($codepoint & 0xFFFFF800) == 0xD800) ||
|
|
// Codepoints outside the Unicode range are illegal
|
|
($codepoint > 0x10FFFF)) {
|
|
$state = 0;
|
|
$codepoint = 0;
|
|
$bytes = 1;
|
|
$result[] = 0xFFFD;
|
|
continue ;
|
|
}
|
|
if (0xFEFF != $codepoint) {
|
|
// BOM is legal but we don't want to output it
|
|
$result[] = $codepoint;
|
|
}
|
|
// Initialize UTF8 cache
|
|
$state = 0;
|
|
$codepoint = 0;
|
|
$bytes = 1;
|
|
}
|
|
} else {
|
|
// ((0xC0 & (*in) != 0x80) && (state != 0))
|
|
// Incomplete multi-octet sequence.
|
|
$state = 0;
|
|
$codepoint = 0;
|
|
$bytes = 1;
|
|
$result[] = 0xFFFD;
|
|
}
|
|
}
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Takes an array of Unicode codepoints and returns a UTF-8 string.
|
|
* @param array $codepoints An array of Unicode codepoints representing a string.
|
|
* @return string Returns a UTF-8 string constructed using the given codepoints.
|
|
*/
|
|
function _api_utf8_from_unicode($codepoints) {
|
|
return implode(array_map('_api_utf8_chr', $codepoints));
|
|
}
|
|
|
|
/**
|
|
* Takes a codepoint and returns its correspondent UTF-8 encoded character.
|
|
* Astral planes are supported, ie the intger input can be > 0xFFFF. Occurrances of the BOM are ignored.
|
|
* Surrogates are not allowed.
|
|
* @param int $codepoint The Unicode codepoint.
|
|
* @return string Returns the corresponding UTF-8 character.
|
|
* @author Henri Sivonen, mailto:hsivonen@iki.fi
|
|
* @link http://hsivonen.iki.fi/php-utf8/
|
|
* @author Ivan Tcholakov, 2009, modifications for the Dokeos LMS.
|
|
* @see _api_utf8_from_unicode()
|
|
* This is a UTF-8 aware version of the function chr().
|
|
* @link http://php.net/manual/en/function.chr.php
|
|
*/
|
|
function _api_utf8_chr($codepoint) {
|
|
// ASCII range (including control chars)
|
|
if ( ($codepoint >= 0) && ($codepoint <= 0x007f) ) {
|
|
$result = chr($codepoint);
|
|
// 2 byte sequence
|
|
} else if ($codepoint <= 0x07ff) {
|
|
$result = chr(0xc0 | ($codepoint >> 6)) . chr(0x80 | ($codepoint & 0x003f));
|
|
// Byte order mark (skip)
|
|
} else if($codepoint == 0xFEFF) {
|
|
// nop -- zap the BOM
|
|
$result = '';
|
|
// Test for illegal surrogates
|
|
} else if ($codepoint >= 0xD800 && $codepoint <= 0xDFFF) {
|
|
// found a surrogate
|
|
$result = _api_utf8_chr(0xFFFD); // U+FFFD REPLACEMENT CHARACTER is the general substitute character in the Unicode Standard.
|
|
// 3 byte sequence
|
|
} else if ($codepoint <= 0xffff) {
|
|
$result = chr(0xe0 | ($codepoint >> 12)) . chr(0x80 | (($codepoint >> 6) & 0x003f)) . chr(0x80 | ($codepoint & 0x003f));
|
|
// 4 byte sequence
|
|
} else if ($codepoint <= 0x10ffff) {
|
|
$result = chr(0xf0 | ($codepoint >> 18)) . chr(0x80 | (($codepoint >> 12) & 0x3f)) . chr(0x80 | (($codepoint >> 6) & 0x3f)) . chr(0x80 | ($codepoint & 0x3f));
|
|
} else {
|
|
// out of range
|
|
$result = _api_utf8_chr(0xFFFD);
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Takes the first UTF-8 character in a string and returns its Unicode codepoint.
|
|
* @param string $utf8_character The UTF-8 encoded character.
|
|
* @return int Returns: the codepoint; or 0xFFFD (unknown character) when the input string is empty.
|
|
* This is a UTF-8 aware version of the function ord().
|
|
* @link http://php.net/manual/en/function.ord.php
|
|
* Note about a difference with the original funtion ord(): ord('') returns 0.
|
|
*/
|
|
function _api_utf8_ord($utf8_character) {
|
|
if ($utf8_character == '') {
|
|
return 0xFFFD;
|
|
}
|
|
$codepoints = _api_utf8_to_unicode($utf8_character);
|
|
return $codepoints[0];
|
|
}
|
|
|
|
/**
|
|
* Makes a html-entity from Unicode codepoint.
|
|
* @param int $codepoint The Unicode codepoint.
|
|
* @return string Returns the corresponding html-entity; or ASCII character if $codepoint < 128.
|
|
*/
|
|
function _api_html_entity_from_unicode($codepoint) {
|
|
if ($codepoint < 128) {
|
|
return chr($codepoint);
|
|
}
|
|
return '&#'.$codepoint.';';
|
|
}
|
|
|
|
/**
|
|
* Appendix to "Common multibyte string functions"
|
|
*/
|
|
|
|
/**
|
|
* The following function reads case folding properties about a given character from a file-based "database".
|
|
* @param int $codepoint The Unicode codepoint that represents a caharacter.
|
|
* @param string $type (optional) The type of initial case to be altered: 'lower' (default) or 'upper'.
|
|
* @return array Returns an array with properties used to change case of the character.
|
|
*/
|
|
function &_api_utf8_get_letter_case_properties($codepoint, $type = 'lower') {
|
|
static $config = array();
|
|
static $range = array();
|
|
if (!isset($range[$codepoint])) {
|
|
if ($codepoint > 128 && $codepoint < 256) {
|
|
$range[$codepoint] = '0080_00ff'; // Latin-1 Supplement
|
|
} elseif ($codepoint < 384) {
|
|
$range[$codepoint] = '0100_017f'; // Latin Extended-A
|
|
} elseif ($codepoint < 592) {
|
|
$range[$codepoint] = '0180_024F'; // Latin Extended-B
|
|
} elseif ($codepoint < 688) {
|
|
$range[$codepoint] = '0250_02af'; // IPA Extensions
|
|
} elseif ($codepoint >= 880 && $codepoint < 1024) {
|
|
$range[$codepoint] = '0370_03ff'; // Greek and Coptic
|
|
} elseif ($codepoint < 1280) {
|
|
$range[$codepoint] = '0400_04ff'; // Cyrillic
|
|
} elseif ($codepoint < 1328) {
|
|
$range[$codepoint] = '0500_052f'; // Cyrillic Supplement
|
|
} elseif ($codepoint < 1424) {
|
|
$range[$codepoint] = '0530_058f'; // Armenian
|
|
} elseif ($codepoint >= 7680 && $codepoint < 7936) {
|
|
$range[$codepoint] = '1e00_1eff'; // Latin Extended Additional
|
|
} elseif ($codepoint < 8192) {
|
|
$range[$codepoint] = '1f00_1fff'; // Greek Extended
|
|
} elseif ($codepoint >= 8448 && $codepoint < 8528) {
|
|
$range[$codepoint] = '2100_214f'; // Letterlike Symbols
|
|
} elseif ($codepoint < 8592) {
|
|
$range[$codepoint] = '2150_218f'; // Number Forms
|
|
} elseif ($codepoint >= 9312 && $codepoint < 9472) {
|
|
$range[$codepoint] = '2460_24ff'; // Enclosed Alphanumerics
|
|
} elseif ($codepoint >= 11264 && $codepoint < 11360) {
|
|
$range[$codepoint] = '2c00_2c5f'; // Glagolitic
|
|
} elseif ($codepoint < 11392) {
|
|
$range[$codepoint] = '2c60_2c7f'; // Latin Extended-C
|
|
} elseif ($codepoint < 11520) {
|
|
$range[$codepoint] = '2c80_2cff'; // Coptic
|
|
} elseif ($codepoint >= 65280 && $codepoint < 65520) {
|
|
$range[$codepoint] = 'ff00_ffef'; // Halfwidth and Fullwidth Forms
|
|
} else {
|
|
$range[$codepoint] = false;
|
|
}
|
|
if ($range[$codepoint] === false) {
|
|
return null;
|
|
}
|
|
if (!isset($config[$range[$codepoint]])) {
|
|
$file = dirname(__FILE__).'/internationalization_database/casefolding/' . $range[$codepoint] . '.php';
|
|
if (file_exists($file)) {
|
|
include $file;
|
|
}
|
|
}
|
|
}
|
|
if ($range[$codepoint] === false || !isset($config[$range[$codepoint]])) {
|
|
return null;
|
|
}
|
|
$result = array();
|
|
$count = count($config[$range[$codepoint]]);
|
|
for ($i = 0; $i < $count; $i++) {
|
|
if ($type === 'lower' && $config[$range[$codepoint]][$i][$type][0] === $codepoint) {
|
|
$result[] = $config[$range[$codepoint]][$i];
|
|
} elseif ($type === 'upper' && $config[$range[$codepoint]][$i][$type] === $codepoint) {
|
|
$result[] = $config[$range[$codepoint]][$i];
|
|
}
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* A callback for serving the function api_ucwords().
|
|
* @param array $matches Input array of matches corresponding to a single word
|
|
* @return string Returns a with first char of the word in uppercase
|
|
*/
|
|
function _api_utf8_ucwords_callback($matches) {
|
|
return $matches[2] . api_ucfirst(ltrim($matches[0]), 'UTF-8');
|
|
}
|
|
|
|
/**
|
|
* Appendix to "Common sting operations with arrays"
|
|
*/
|
|
|
|
/**
|
|
* This callback function converts from UTF-8 to other encoding. It works with strings or arrays of strings.
|
|
* @param mixed $variable The variable to be converted, a string or an array.
|
|
* @return mixed Returns the converted form UTF-8 $variable with the same type, string or array.
|
|
*/
|
|
function _api_array_utf8_decode($variable) {
|
|
global $_api_encoding;
|
|
if (is_array($variable)) {
|
|
return array_map('_api_array_utf8_decode', $variable);
|
|
}
|
|
if (is_string($variable)) {
|
|
return api_utf8_decode($variable, $_api_encoding);
|
|
}
|
|
return $variable;
|
|
}
|
|
|
|
/**
|
|
* Appendix to "String comparison"
|
|
*/
|
|
|
|
/**
|
|
* Returns an instance of Collator class (ICU) created for a specified language.
|
|
* @param string $language (optional) Language indentificator: 'english', 'french' ... If it is omited, the current interface language is assumed.
|
|
* @return object Returns a instance of Collator class that is suitable for common string comparisons.
|
|
*/
|
|
function _api_get_collator($language = null) {
|
|
static $collator = array();
|
|
if (empty($language)) {
|
|
$language = api_get_interface_language();
|
|
}
|
|
if (!isset($collator[$language])) {
|
|
$locale = _api_get_locale_from_language($language);
|
|
$collator[$language] = collator_create($locale);
|
|
if (is_object($collator[$language])) {
|
|
collator_set_attribute($collator[$language], Collator::CASE_FIRST, Collator::UPPER_FIRST);
|
|
}
|
|
}
|
|
return $collator[$language];
|
|
}
|
|
|
|
/**
|
|
* Returns an instance of Collator class (ICU) created for a specified language. This collator treats substrings of digits as numbers.
|
|
* @param string $language (optional) Language indentificator. If it is omited, the current interface language is assumed.
|
|
* @return object Returns a instance of Collator class that is suitable for alpha-numerical comparisons.
|
|
*/
|
|
function _api_get_alpha_numerical_collator($language = null) {
|
|
static $collator = array();
|
|
if (empty($language)) {
|
|
$language = api_get_interface_language();
|
|
}
|
|
if (!isset($collator[$language])) {
|
|
$locale = _api_get_locale_from_language($language);
|
|
$collator[$language] = collator_create($locale);
|
|
if (is_object($collator[$language])) {
|
|
collator_set_attribute($collator[$language], Collator::CASE_FIRST, Collator::UPPER_FIRST);
|
|
collator_set_attribute($collator[$language], Collator::NUMERIC_COLLATION, Collator::ON);
|
|
}
|
|
}
|
|
return $collator[$language];
|
|
}
|
|
|
|
/**
|
|
* A string comparison callback function for sorting.
|
|
* @param string $string1 The first string.
|
|
* @param string $string2 The second string.
|
|
* @return int Returns 0 if $string1 = $string2 or if there is an error; 1 if $string1 > $string2; -1 if $string1 < $string2.
|
|
*/
|
|
function _api_cmp($string1, $string2) {
|
|
global $_api_collator, $_api_encoding;
|
|
$result = collator_compare($_api_collator, api_utf8_encode($string1, $_api_encoding), api_utf8_encode($string2, $_api_encoding));
|
|
return $result === false ? 0 : $result;
|
|
}
|
|
|
|
/**
|
|
* A reverse string comparison callback function for sorting.
|
|
* @param string $string1 The first string.
|
|
* @param string $string2 The second string.
|
|
* @return int Returns 0 if $string1 = $string2 or if there is an error; 1 if $string1 < $string2; -1 if $string1 > $string2.
|
|
*/
|
|
function _api_rcmp($string1, $string2) {
|
|
global $_api_collator, $_api_encoding;
|
|
$result = collator_compare($_api_collator, api_utf8_encode($string2, $_api_encoding), api_utf8_encode($string1, $_api_encoding));
|
|
return $result === false ? 0 : $result;
|
|
}
|
|
|
|
/**
|
|
* A case-insensitive string comparison callback function for sorting.
|
|
* @param string $string1 The first string.
|
|
* @param string $string2 The second string.
|
|
* @return int Returns 0 if $string1 = $string2 or if there is an error; 1 if $string1 > $string2; -1 if $string1 < $string2.
|
|
*/
|
|
function _api_casecmp($string1, $string2) {
|
|
global $_api_collator, $_api_encoding;
|
|
$result = collator_compare($_api_collator, api_strtolower(api_utf8_encode($string1, $_api_encoding), 'UTF-8'), api_strtolower(api_utf8_encode($string2, $_api_encoding), 'UTF-8'));
|
|
return $result === false ? 0 : $result;
|
|
}
|
|
|
|
/**
|
|
* A reverse case-insensitive string comparison callback function for sorting.
|
|
* @param string $string1 The first string.
|
|
* @param string $string2 The second string.
|
|
* @return int Returns 0 if $string1 = $string2 or if there is an error; 1 if $string1 < $string2; -1 if $string1 > $string2.
|
|
*/
|
|
function _api_casercmp($string1, $string2) {
|
|
global $_api_collator, $_api_encoding;
|
|
$result = collator_compare($_api_collator, api_strtolower(api_utf8_encode($string2, $_api_encoding), 'UTF-8'), api_strtolower(api_utf8_encode($string1, $_api_encoding), 'UTF-8'));
|
|
return $result === false ? 0 : $result;
|
|
}
|
|
|
|
/**
|
|
* A reverse function from php-core function strnatcmp(), performs string comparison in reverse natural (alpha-numerical) order.
|
|
* @param string $string1 The first string.
|
|
* @param string $string2 The second string.
|
|
* @return int Returns 0 if $string1 = $string2; >0 if $string1 < $string2; <0 if $string1 > $string2.
|
|
*/
|
|
function _api_strnatrcmp($string1, $string2) {
|
|
return strnatcmp($string2, $string1);
|
|
}
|
|
|
|
/**
|
|
* A reverse function from php-core function strnatcasecmp(), performs string comparison in reverse case-insensitive natural (alpha-numerical) order.
|
|
* @param string $string1 The first string.
|
|
* @param string $string2 The second string.
|
|
* @return int Returns 0 if $string1 = $string2; >0 if $string1 < $string2; <0 if $string1 > $string2.
|
|
*/
|
|
function _api_strnatcasercmp($string1, $string2) {
|
|
return strnatcasecmp($string2, $string1);
|
|
}
|
|
|
|
/**
|
|
* A function that translates sorting flag constants from php core to correspondent constants from intl extension.
|
|
* @param int $sort_flag (optional) Sorting modifier flag as it is defined for php core. The default value is SORT_REGULAR.
|
|
* @return int Retturns the corresponding sorting modifier flag as it is defined in intl php-extension.
|
|
*/
|
|
function _api_get_collator_sort_flag($sort_flag = SORT_REGULAR) {
|
|
switch ($sort_flag) {
|
|
case SORT_STRING:
|
|
case SORT_LOCALE_STRING:
|
|
return Collator::SORT_STRING;
|
|
case SORT_NUMERIC:
|
|
return Collator::SORT_NUMERIC;
|
|
}
|
|
return Collator::SORT_REGULAR;
|
|
}
|
|
|
|
/**
|
|
* ICU locales (accessible through intl extension).
|
|
*/
|
|
|
|
/**
|
|
* Returns isocode (see api_get_language_isocode()) which is purified accordingly to
|
|
* be used by the php intl extension (ICU library).
|
|
* @param string $language (optional) This is the name of the folder containing translations for the corresponding language.
|
|
* If $language is omitted, interface language is assumed then.
|
|
* @return string The found language locale id or null on error. Examples: bg, en, pt_BR, ...
|
|
*/
|
|
function _api_get_locale_from_language($language = null) {
|
|
static $locale = array();
|
|
if (empty($language)) {
|
|
$language = api_get_interface_language();
|
|
}
|
|
if (!isset($locale[$language])) {
|
|
$locale[$language] = str_replace('-', '_', api_get_language_isocode($language));
|
|
}
|
|
return $locale[$language];
|
|
}
|
|
|
|
/**
|
|
* Sets/gets the default internal value of the locale id (for the intl extension, ICU).
|
|
* @param string $locale (optional) The locale id to be set. When it is omitted, the function returns (gets, reads) the default internal value.
|
|
* @return mixed When the function sets the default value, it returns TRUE on success or FALSE on error. Otherwise the function returns as string the current default value.
|
|
*/
|
|
function _api_set_default_locale($locale = null) {
|
|
static $default_locale = 'en';
|
|
if (!empty($locale)) {
|
|
$default_locale = $locale;
|
|
if (INTL_INSTALLED) {
|
|
return @locale_set_default($locale);
|
|
}
|
|
return true;
|
|
} else {
|
|
if (INTL_INSTALLED) {
|
|
$default_locale = @locale_get_default();
|
|
}
|
|
}
|
|
return $default_locale;
|
|
}
|
|
|
|
/**
|
|
* Gets the default internal value of the locale id (for the intl extension, ICU).
|
|
* @return string Returns as string the current default value.
|
|
*/
|
|
function api_get_default_locale() {
|
|
return _api_set_default_locale();
|
|
}
|
|
|
|
/**
|
|
* Appendix to "Encoding management functions"
|
|
*/
|
|
|
|
/**
|
|
* Returns a table with non-UTF-8 encodings for all system languages.
|
|
* @return array Returns an array in the form array('language1' => array('encoding1', encoding2', ...), ...)
|
|
* Note: The function api_get_non_utf8_encoding() returns the first encoding from this array that is correspondent to the given language.
|
|
*/
|
|
function & _api_non_utf8_encodings() {
|
|
static $encodings;
|
|
if (!isset($encodings)) {
|
|
$file = dirname(__FILE__).'/internationalization_database/non_utf8_encodings.php';
|
|
if (file_exists($file)) {
|
|
$encodings = include ($file);
|
|
} else {
|
|
$encodings = array('english' => array('ISO-8859-15'));
|
|
}
|
|
}
|
|
return $encodings;
|
|
}
|
|
|
|
/**
|
|
* Sets/Gets internal character encoding of the common string functions within the PHP mbstring extension.
|
|
* @param string $encoding (optional) When this parameter is given, the function sets the internal encoding.
|
|
* @return string When $encoding parameter is not given, the function returns the internal encoding.
|
|
* Note: This function is used in the global initialization script for setting the internal encoding to the platform's character set.
|
|
* @link http://php.net/manual/en/function.mb-internal-encoding
|
|
*/
|
|
function _api_mb_internal_encoding($encoding = null) {
|
|
static $mb_internal_encoding = null;
|
|
if (empty($encoding)) {
|
|
if (is_null($mb_internal_encoding)) {
|
|
if (MBSTRING_INSTALLED) {
|
|
$mb_internal_encoding = @mb_internal_encoding();
|
|
} else {
|
|
$mb_internal_encoding = 'UTF-8';
|
|
}
|
|
}
|
|
return $mb_internal_encoding;
|
|
}
|
|
$mb_internal_encoding = $encoding;
|
|
if (_api_mb_supports($encoding)) {
|
|
return @mb_internal_encoding($encoding);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Sets/Gets internal character encoding of the regular expression functions (ereg-like) within the PHP mbstring extension.
|
|
* @param string $encoding (optional) When this parameter is given, the function sets the internal encoding.
|
|
* @return string When $encoding parameter is not given, the function returns the internal encoding.
|
|
* Note: This function is used in the global initialization script for setting the internal encoding to the platform's character set.
|
|
* @link http://php.net/manual/en/function.mb-regex-encoding
|
|
*/
|
|
function _api_mb_regex_encoding($encoding = null) {
|
|
static $mb_regex_encoding = null;
|
|
if (empty($encoding)) {
|
|
if (is_null($mb_regex_encoding)) {
|
|
if (MBSTRING_INSTALLED) {
|
|
$mb_regex_encoding = @mb_regex_encoding();
|
|
} else {
|
|
$mb_regex_encoding = 'UTF-8';
|
|
}
|
|
}
|
|
return $mb_regex_encoding;
|
|
}
|
|
$mb_regex_encoding = $encoding;
|
|
if (_api_mb_supports($encoding)) {
|
|
return @mb_regex_encoding($encoding);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Retrieves specified internal encoding configuration variable within the PHP iconv extension.
|
|
* @param string $type The parameter $type could be: 'iconv_internal_encoding', 'iconv_input_encoding', or 'iconv_output_encoding'.
|
|
* @return mixed The function returns the requested encoding or FALSE on error.
|
|
* @link http://php.net/manual/en/function.iconv-get-encoding
|
|
*/
|
|
function _api_iconv_get_encoding($type) {
|
|
return _api_iconv_set_encoding($type);
|
|
}
|
|
|
|
/**
|
|
* Sets specified internal encoding configuration variables within the PHP iconv extension.
|
|
* @param string $type The parameter $type could be: 'iconv_internal_encoding', 'iconv_input_encoding', or 'iconv_output_encoding'.
|
|
* @param string $encoding (optional) The desired encoding to be set.
|
|
* @return bool Returns TRUE on success, FALSE on error.
|
|
* Note: This function is used in the global initialization script for setting these three internal encodings to the platform's character set.
|
|
* @link http://php.net/manual/en/function.iconv-set-encoding
|
|
*/
|
|
function _api_iconv_set_encoding($type, $encoding = null) {
|
|
static $iconv_internal_encoding = null;
|
|
static $iconv_input_encoding = null;
|
|
static $iconv_output_encoding = null;
|
|
if (!ICONV_INSTALLED) {
|
|
return false;
|
|
}
|
|
switch ($type) {
|
|
case 'iconv_internal_encoding':
|
|
if (empty($encoding)) {
|
|
if (is_null($iconv_internal_encoding)) {
|
|
$iconv_internal_encoding = @iconv_get_encoding($type);
|
|
}
|
|
return $iconv_internal_encoding;
|
|
}
|
|
if (_api_iconv_supports($encoding)) {
|
|
if(@iconv_set_encoding($type, $encoding)) {
|
|
$iconv_internal_encoding = $encoding;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
return false;
|
|
case 'iconv_input_encoding':
|
|
if (empty($encoding)) {
|
|
if (is_null($iconv_input_encoding)) {
|
|
$iconv_input_encoding = @iconv_get_encoding($type);
|
|
}
|
|
return $iconv_input_encoding;
|
|
}
|
|
if (_api_iconv_supports($encoding)) {
|
|
if(@iconv_set_encoding($type, $encoding)) {
|
|
$iconv_input_encoding = $encoding;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
return false;
|
|
case 'iconv_output_encoding':
|
|
if (empty($encoding)) {
|
|
if (is_null($iconv_output_encoding)) {
|
|
$iconv_output_encoding = @iconv_get_encoding($type);
|
|
}
|
|
return $iconv_output_encoding;
|
|
}
|
|
if (_api_iconv_supports($encoding)) {
|
|
if(@iconv_set_encoding($type, $encoding)) {
|
|
$iconv_output_encoding = $encoding;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
return false;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Checks whether a given encoding is known to define single-byte characters only.
|
|
* The result might be not accurate for unknown by this library encodings. This is not fatal,
|
|
* then the library picks up conversions plus Unicode related internal algorithms.
|
|
* @param string $encoding A given encoding identificator.
|
|
* @return bool TRUE if the encoding is known as single-byte (for ISO-8859-15, WINDOWS-1251, etc.), FALSE otherwise.
|
|
*/
|
|
function _api_is_single_byte_encoding($encoding) {
|
|
static $checked = array();
|
|
if (!isset($checked[$encoding])) {
|
|
$character_map = _api_get_character_map_name(api_refine_encoding_id($encoding));
|
|
$checked[$encoding] = (!empty($character_map)
|
|
&& !in_array($character_map, array('UTF-8', 'HTML-ENTITIES')));
|
|
}
|
|
return $checked[$encoding];
|
|
}
|
|
|
|
/**
|
|
* Checks whether the specified encoding is supported by the PHP mbstring extension.
|
|
* @param string $encoding The specified encoding.
|
|
* @return bool Returns TRUE when the specified encoding is supported, FALSE othewise.
|
|
*/
|
|
function _api_mb_supports($encoding) {
|
|
static $supported = array();
|
|
if (!isset($supported[$encoding])) {
|
|
if (MBSTRING_INSTALLED) {
|
|
$supported[$encoding] = api_equal_encodings($encoding, mb_list_encodings(), true);
|
|
} else {
|
|
$supported[$encoding] = false;
|
|
}
|
|
}
|
|
return $supported[$encoding];
|
|
}
|
|
|
|
/**
|
|
* Checks whether the specified encoding is supported by the PHP iconv extension.
|
|
* @param string $encoding The specified encoding.
|
|
* @return bool Returns TRUE when the specified encoding is supported, FALSE othewise.
|
|
*/
|
|
function _api_iconv_supports($encoding) {
|
|
static $supported = array();
|
|
if (!isset($supported[$encoding])) {
|
|
if (ICONV_INSTALLED) {
|
|
$enc = api_refine_encoding_id($encoding);
|
|
if ($enc != 'HTML-ENTITIES') {
|
|
$test_string = '';
|
|
for ($i = 32; $i < 128; $i++) {
|
|
$test_string .= chr($i);
|
|
}
|
|
$supported[$encoding] = (@iconv_strlen($test_string, $enc)) ? true : false;
|
|
} else {
|
|
$supported[$encoding] = false;
|
|
}
|
|
} else {
|
|
$supported[$encoding] = false;
|
|
}
|
|
}
|
|
return $supported[$encoding];
|
|
}
|
|
|
|
// This function checks whether the function _api_convert_encoding() (the php-
|
|
// implementation) is able to convert from/to a given encoding.
|
|
function _api_convert_encoding_supports($encoding) {
|
|
static $supports = array();
|
|
if (!isset($supports[$encoding])) {
|
|
$supports[$encoding] = _api_get_character_map_name(api_refine_encoding_id($encoding)) != '';
|
|
}
|
|
return $supports[$encoding];
|
|
}
|
|
|
|
/**
|
|
* Checks whether the specified encoding is supported by the html-entitiy related functions.
|
|
* @param string $encoding The specified encoding.
|
|
* @return bool Returns TRUE when the specified encoding is supported, FALSE othewise.
|
|
*/
|
|
function _api_html_entity_supports($encoding) {
|
|
static $supports = array();
|
|
if (!isset($supports[$encoding])) {
|
|
// See http://php.net/manual/en/function.htmlentities.php
|
|
$html_entity_encodings = array(
|
|
'ISO-8859-1',
|
|
'ISO-8859-15',
|
|
'UTF-8',
|
|
'CP866',
|
|
'CP1251',
|
|
'CP1252',
|
|
'KOI8-R',
|
|
'BIG5', '950',
|
|
'GB2312', '936',
|
|
'BIG5-HKSCS',
|
|
'Shift_JIS', 'SJIS', '932',
|
|
'EUC-JP', 'EUCJP'
|
|
);
|
|
$supports[$encoding] = api_equal_encodings($encoding, $html_entity_encodings);
|
|
}
|
|
return $supports[$encoding];
|
|
}
|
|
|