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1098 lines
42 KiB
1098 lines
42 KiB
<?php
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/* For licensing terms, see /license.txt */
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/**
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* This is the text library for Chamilo.
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* It is loaded during the global initialization,
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* so the functions below are available everywhere.
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*
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* @package chamilo.library
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*/
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define('EXERCISE_NUMBER_OF_DECIMALS', 2);
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/**
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* This function strips all html-tags found in the input string and outputs a pure text.
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* Mostly, the function is to be used before language or encoding detection of the input string.
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* @param string $string The input string with html-tags to be converted to plain text.
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* @return string The returned plain text as a result.
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*/
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function api_html_to_text($string)
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{
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// These purifications have been found experimentally, for nice looking output.
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$string = preg_replace('/<br[^>]*>/i', "\n", $string);
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$string = preg_replace('/<\/?(div|p|h[1-6]|table|ol|ul|blockquote)[^>]*>/i', "\n", $string);
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$string = preg_replace('/<\/(tr|li)[^>]*>/i', "\n", $string);
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$string = preg_replace('/<\/(td|th)[^>]*>/i', "\t", $string);
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$string = strip_tags($string);
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// Line endings unification and cleaning.
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$string = str_replace(array("\r\n", "\n\r", "\r"), "\n", $string);
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$string = preg_replace('/\s*\n/', "\n", $string);
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$string = preg_replace('/\n+/', "\n", $string);
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return trim($string);
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}
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/**
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* Detects encoding of html-formatted text.
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* @param string $string The input html-formatted text.
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* @return string Returns the detected encoding.
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*/
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function api_detect_encoding_html($string) {
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if (@preg_match('/<head.*(<meta[^>]*content=[^>]*>).*<\/head>/si', $string, $matches)) {
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if (@preg_match('/<meta[^>]*charset=(.*)["\';][^>]*>/si', $matches[1], $matches)) {
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return api_refine_encoding_id(trim($matches[1]));
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}
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}
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return api_detect_encoding(api_html_to_text($string));
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}
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/**
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* Converts the text of a html-document to a given encoding, the meta-tag is changed accordingly.
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* @param string $string The input full-html document.
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* @param string The new encoding value to be set.
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*/
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function api_set_encoding_html(&$string, $encoding) {
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$old_encoding = api_detect_encoding_html($string);
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if (@preg_match('/(.*<head.*)(<meta[^>]*content=[^>]*>)(.*<\/head>.*)/si', $string, $matches)) {
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$meta = $matches[2];
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if (@preg_match("/(<meta[^>]*charset=)(.*)([\"';][^>]*>)/si", $meta, $matches1)) {
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$meta = $matches1[1] . $encoding . $matches1[3];
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$string = $matches[1] . $meta . $matches[3];
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} else {
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$string = $matches[1] . '<meta http-equiv="Content-Type" content="text/html; charset='.$encoding.'"/>' . $matches[3];
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}
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} else {
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$count = 1;
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$string = str_ireplace('</head>', '<meta http-equiv="Content-Type" content="text/html; charset='.$encoding.'"/></head>', $string, $count);
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}
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$string = api_convert_encoding($string, $encoding, $old_encoding);
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}
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/**
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* Returns the title of a html document.
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* @param string $string The contents of the input document.
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* @param string $input_encoding The encoding of the input document. If the value is not set, it is detected.
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* @param string $$output_encoding The encoding of the retrieved title. If the value is not set, the system encoding is assumend.
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* @return string The retrieved title, html-entities and extra-whitespace between the words are cleaned.
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*/
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function api_get_title_html(&$string, $output_encoding = null, $input_encoding = null) {
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if (@preg_match('/<head.+<title[^>]*>(.*)<\/title>/msi', $string, $matches)) {
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if (empty($output_encoding)) {
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$output_encoding = api_get_system_encoding();
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}
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if (empty($input_encoding)) {
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$input_encoding = api_detect_encoding_html($string);
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}
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return trim(@preg_replace('/\s+/', ' ', api_html_entity_decode(api_convert_encoding($matches[1], $output_encoding, $input_encoding), ENT_QUOTES, $output_encoding)));
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}
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return '';
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}
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/* XML processing functions */
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// A regular expression for accessing declared encoding within xml-formatted text.
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// Published by Steve Minutillo,
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// http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss/
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define('_PCRE_XML_ENCODING', '/<\?xml.*encoding=[\'"](.*?)[\'"].*\?>/m');
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/**
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* Detects encoding of xml-formatted text.
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* @param string $string The input xml-formatted text.
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* @param string $default_encoding This is the default encoding to be returned if there is no way the xml-text's encoding to be detected. If it not spesified, the system encoding is assumed then.
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* @return string Returns the detected encoding.
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* @todo The second parameter is to be eliminated. See api_detect_encoding_html().
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*/
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function api_detect_encoding_xml($string, $default_encoding = null) {
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if (preg_match(_PCRE_XML_ENCODING, $string, $matches)) {
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return api_refine_encoding_id($matches[1]);
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}
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if (api_is_valid_utf8($string)) {
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return 'UTF-8';
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}
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if (empty($default_encoding)) {
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$default_encoding = _api_mb_internal_encoding();
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}
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return api_refine_encoding_id($default_encoding);
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}
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/**
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* Converts character encoding of a xml-formatted text. If inside the text the encoding is declared, it is modified accordingly.
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* @param string $string The text being converted.
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* @param string $to_encoding The encoding that text is being converted to.
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* @param string $from_encoding (optional) The encoding that text is being converted from. If it is omited, it is tried to be detected then.
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* @return string Returns the converted xml-text.
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*/
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function api_convert_encoding_xml($string, $to_encoding, $from_encoding = null) {
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return _api_convert_encoding_xml($string, $to_encoding, $from_encoding);
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}
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/**
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* Converts character encoding of a xml-formatted text into UTF-8. If inside the text the encoding is declared, it is set to UTF-8.
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* @param string $string The text being converted.
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* @param string $from_encoding (optional) The encoding that text is being converted from. If it is omited, it is tried to be detected then.
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* @return string Returns the converted xml-text.
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*/
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function api_utf8_encode_xml($string, $from_encoding = null) {
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return _api_convert_encoding_xml($string, 'UTF-8', $from_encoding);
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}
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/**
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* Converts character encoding of a xml-formatted text from UTF-8 into a specified encoding. If inside the text the encoding is declared, it is modified accordingly.
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* @param string $string The text being converted.
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* @param string $to_encoding (optional) The encoding that text is being converted to. If it is omited, the platform character set is assumed.
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* @return string Returns the converted xml-text.
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*/
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function api_utf8_decode_xml($string, $to_encoding = null) {
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if (empty($to_encoding)) {
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$to_encoding = _api_mb_internal_encoding();
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}
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return _api_convert_encoding_xml($string, $to_encoding, 'UTF-8');
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}
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/**
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* Converts character encoding of a xml-formatted text. If inside the text the encoding is declared, it is modified accordingly.
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* @param string $string The text being converted.
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* @param string $to_encoding The encoding that text is being converted to.
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* @param string $from_encoding (optional) The encoding that text is being converted from. If the value is empty, it is tried to be detected then.
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* @return string Returns the converted xml-text.
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*/
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function _api_convert_encoding_xml(&$string, $to_encoding, $from_encoding) {
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if (empty($from_encoding)) {
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$from_encoding = api_detect_encoding_xml($string);
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}
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$to_encoding = api_refine_encoding_id($to_encoding);
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if (!preg_match('/<\?xml.*\?>/m', $string, $matches)) {
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return api_convert_encoding('<?xml version="1.0" encoding="'.$to_encoding.'"?>'."\n".$string, $to_encoding, $from_encoding);
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}
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if (!preg_match(_PCRE_XML_ENCODING, $string)) {
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if (strpos($matches[0], 'standalone') !== false) {
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// The encoding option should precede the standalone option, othewise DOMDocument fails to load the document.
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$replace = str_replace('standalone', ' encoding="'.$to_encoding.'" standalone' , $matches[0]);
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} else {
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$replace = str_replace('?>', ' encoding="'.$to_encoding.'"?>' , $matches[0]);
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}
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return api_convert_encoding(str_replace($matches[0], $replace, $string), $to_encoding, $from_encoding);
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}
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global $_api_encoding;
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$_api_encoding = api_refine_encoding_id($to_encoding);
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return api_convert_encoding(preg_replace_callback(_PCRE_XML_ENCODING, '_api_convert_encoding_xml_callback', $string), $to_encoding, $from_encoding);
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}
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/**
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* A callback for serving the function _api_convert_encoding_xml().
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* @param array $matches Input array of matches corresponding to the xml-declaration.
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* @return string Returns the xml-declaration with modified encoding.
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*/
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function _api_convert_encoding_xml_callback($matches) {
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global $_api_encoding;
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return str_replace($matches[1], $_api_encoding, $matches[0]);
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}
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/* CSV processing functions */
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/**
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* Parses CSV data (one line) into an array. This function is not affected by the OS-locale settings.
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* @param string $string The input string.
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* @param string $delimiter (optional) The field delimiter, one character only. The default delimiter character is comma {,).
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* @param string $enclosure (optional) The field enclosure, one character only. The default enclosure character is quote (").
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* @param string $escape (optional) The escape character, one character only. The default escape character is backslash (\).
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* @return array Returns an array containing the fields read.
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* Note: In order this function to work correctly with UTF-8, limitation for the parameters $delimiter, $enclosure and $escape
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* should be kept. These parameters should be single ASCII characters only. Thus the implementation of this function is faster.
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* @link http://php.net/manual/en/function.str-getcsv.php (exists as of PHP 5 >= 5.3.0)
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*/
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function & api_str_getcsv(& $string, $delimiter = ',', $enclosure = '"', $escape = '\\') {
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$delimiter = (string)$delimiter;
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if (api_byte_count($delimiter) > 1) { $delimiter = $delimiter[1]; }
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$enclosure = (string)$enclosure;
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if (api_byte_count($enclosure) > 1) { $enclosure = $enclosure[1]; }
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$escape = (string)$escape;
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if (api_byte_count($escape) > 1) { $escape = $escape[1]; }
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$str = (string)$string;
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$len = api_byte_count($str);
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$enclosed = false;
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$escaped = false;
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$value = '';
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$result = array();
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for ($i = 0; $i < $len; $i++) {
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$char = $str[$i];
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if ($char == $escape) {
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if (!$escaped) {
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$escaped = true;
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continue;
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}
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}
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$escaped = false;
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switch ($char) {
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case $enclosure:
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if ($enclosed && $str[$i + 1] == $enclosure) {
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$value .= $char;
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$i++;
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} else {
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$enclosed = !$enclosed;
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}
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break;
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case $delimiter:
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if (!$enclosed) {
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$result[] = $value;
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$value = '';
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} else {
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$value .= $char;
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}
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break;
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default:
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$value .= $char;
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break;
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}
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}
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if (!empty($value)) {
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$result[] = $value;
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}
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return $result;
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}
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/**
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* Reads a line from a file pointer and parses it for CSV fields. This function is not affected by the OS-locale settings.
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* @param resource $handle The file pointer, it must be valid and must point to a file successfully opened by fopen().
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* @param int $length (optional) Reading ends when length - 1 bytes have been read, on a newline (which is included in the return value), or on EOF (whichever comes first).
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* If no length is specified, it will keep reading from the stream until it reaches the end of the line.
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* @param string $delimiter (optional) The field delimiter, one character only. The default delimiter character is comma {,).
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* @param string $enclosure (optional) The field enclosure, one character only. The default enclosure character is quote (").
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* @param string $escape (optional) The escape character, one character only. The default escape character is backslash (\).
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* @return array Returns an array containing the fields read.
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* Note: In order this function to work correctly with UTF-8, limitation for the parameters $delimiter, $enclosure and $escape
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* should be kept. These parameters should be single ASCII characters only.
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* @link http://php.net/manual/en/function.fgetcsv.php
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*/
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function api_fgetcsv($handle, $length = null, $delimiter = ',', $enclosure = '"', $escape = '\\') {
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if (($line = is_null($length) ? fgets($handle): fgets($handle, $length)) !== false) {
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$line = rtrim($line, "\r\n");
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return api_str_getcsv($line, $delimiter, $enclosure, $escape);
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}
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return false;
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}
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/* Functions for supporting ASCIIMathML mathematical formulas and ASCIIsvg maathematical graphics */
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/**
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* Dectects ASCIIMathML formula presence within a given html text.
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* @param string $html The input html text.
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* @return bool Returns TRUE when there is a formula found or FALSE otherwise.
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*/
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function api_contains_asciimathml($html) {
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if (!preg_match_all('/<span[^>]*class\s*=\s*[\'"](.*?)[\'"][^>]*>/mi', $html, $matches)) {
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return false;
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}
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foreach ($matches[1] as $string) {
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$string = ' '.str_replace(',', ' ', $string).' ';
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if (preg_match('/\sAM\s/m', $string)) {
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return true;
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}
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}
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return false;
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}
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/**
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* Dectects ASCIIsvg graphics presence within a given html text.
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* @param string $html The input html text.
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* @return bool Returns TRUE when there is a graph found or FALSE otherwise.
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*/
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function api_contains_asciisvg($html) {
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if (!preg_match_all('/<embed([^>]*?)>/mi', $html, $matches)) {
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return false;
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}
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foreach ($matches[1] as $string) {
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$string = ' '.str_replace(',', ' ', $string).' ';
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if (preg_match('/sscr\s*=\s*[\'"](.*?)[\'"]/m', $string)) {
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return true;
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}
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}
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return false;
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}
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/* Miscellaneous text processing functions */
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/**
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* Convers a string from camel case into underscore.
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* Works correctly with ASCII strings only, implementation for human-language strings is not necessary.
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* @param string $string The input string (ASCII)
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* @return string The converted result string
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*/
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function api_camel_case_to_underscore($string) {
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return strtolower(preg_replace('/([a-z])([A-Z])/', "$1_$2", $string));
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}
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/**
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* Converts a string with underscores into camel case.
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* Works correctly with ASCII strings only, implementation for human-language strings is not necessary.
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* @param string $string The input string (ASCII)
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* @param bool $capitalise_first_char (optional) If true (default), the function capitalises the first char in the result string.
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* @return string The converted result string
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*/
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function api_underscore_to_camel_case($string, $capitalise_first_char = true) {
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if ($capitalise_first_char) {
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$string = ucfirst($string);
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}
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return preg_replace_callback('/_([a-z])/', '_api_camelize', $string);
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}
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// A function for internal use, only for this library.
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function _api_camelize($match) {
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return strtoupper($match[1]);
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}
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/**
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* Truncates a string.
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*
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* @author Brouckaert Olivier
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* @param string $text The text to truncate.
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* @param integer $length The approximate desired length. The length of the suffix below is to be added to have the total length of the result string.
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* @param string $suffix A suffix to be added as a replacement.
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* @param string $encoding (optional) The encoding to be used. If it is omitted, the platform character set will be used by default.
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* @param boolean $middle If this parameter is true, truncation is done in the middle of the string.
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* @return string Truncated string, decorated with the given suffix (replacement).
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*/
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function api_trunc_str($text, $length = 30, $suffix = '...', $middle = false, $encoding = null) {
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if (empty($encoding)) {
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$encoding = api_get_system_encoding();
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}
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$text_length = api_strlen($text, $encoding);
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if ($text_length <= $length) {
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return $text;
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}
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if ($middle) {
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return rtrim(api_substr($text, 0, round($length / 2), $encoding)).$suffix.ltrim(api_substr($text, - round($length / 2), $text_length, $encoding));
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}
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return rtrim(api_substr($text, 0, $length, $encoding)).$suffix;
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}
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/**
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* Handling simple and double apostrofe in order that strings be stored properly in database
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*
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* @author Denes Nagy
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* @param string variable - the variable to be revised
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*/
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function domesticate($input) {
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$input = stripslashes($input);
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$input = str_replace("'", "''", $input);
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$input = str_replace('"', "''", $input);
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return ($input);
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}
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/**
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* function make_clickable($string)
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*
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* @desc Completes url contained in the text with "<a href ...".
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* However the function simply returns the submitted text without any
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* transformation if it already contains some "<a href:" or "<img src=".
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* @param string $text text to be converted
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* @return text after conversion
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* @author Rewritten by Nathan Codding - Feb 6, 2001.
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* completed by Hugues Peeters - July 22, 2002
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*
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* Actually this function is taken from the PHP BB 1.4 script
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* - Goes through the given string, and replaces xxxx://yyyy with an HTML <a> tag linking
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* to that URL
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* - Goes through the given string, and replaces www.xxxx.yyyy[zzzz] with an HTML <a> tag linking
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* to http://www.xxxx.yyyy[/zzzz]
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* - Goes through the given string, and replaces xxxx@yyyy with an HTML mailto: tag linking
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* to that email address
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* - Only matches these 2 patterns either after a space, or at the beginning of a line
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*
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* Notes: the email one might get annoying - it's easy to make it more restrictive, though.. maybe
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* have it require something like xxxx@yyyy.zzzz or such. We'll see.
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*/
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/**
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* Callback to convert URI match to HTML A element.
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*
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* This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link
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* make_clickable()}.
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*
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* @since Wordpress 2.3.2
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* @access private
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*
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* @param array $matches Single Regex Match.
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* @return string HTML A element with URI address.
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*/
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function _make_url_clickable_cb($matches) {
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$url = $matches[2];
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|
|
if ( ')' == $matches[3] && strpos( $url, '(' ) ) {
|
|
// If the trailing character is a closing parethesis, and the URL has an opening parenthesis in it, add the closing parenthesis to the URL.
|
|
// Then we can let the parenthesis balancer do its thing below.
|
|
$url .= $matches[3];
|
|
$suffix = '';
|
|
} else {
|
|
$suffix = $matches[3];
|
|
}
|
|
|
|
// Include parentheses in the URL only if paired
|
|
while ( substr_count( $url, '(' ) < substr_count( $url, ')' ) ) {
|
|
$suffix = strrchr( $url, ')' ) . $suffix;
|
|
$url = substr( $url, 0, strrpos( $url, ')' ) );
|
|
}
|
|
|
|
$url = esc_url($url);
|
|
if ( empty($url) )
|
|
return $matches[0];
|
|
|
|
return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $suffix;
|
|
}
|
|
|
|
/**
|
|
* Checks and cleans a URL.
|
|
*
|
|
* A number of characters are removed from the URL. If the URL is for displaying
|
|
* (the default behaviour) ampersands are also replaced. The 'clean_url' filter
|
|
* is applied to the returned cleaned URL.
|
|
*
|
|
* @since wordpress 2.8.0
|
|
* @uses wp_kses_bad_protocol() To only permit protocols in the URL set
|
|
* via $protocols or the common ones set in the function.
|
|
*
|
|
* @param string $url The URL to be cleaned.
|
|
* @param array $protocols Optional. An array of acceptable protocols.
|
|
* Defaults to 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn' if not set.
|
|
* @param string $_context Private. Use esc_url_raw() for database usage.
|
|
* @return string The cleaned $url after the 'clean_url' filter is applied.
|
|
*/
|
|
function esc_url( $url, $protocols = null, $_context = 'display' ) {
|
|
//$original_url = $url;
|
|
|
|
if ( '' == $url )
|
|
return $url;
|
|
$url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url);
|
|
$strip = array('%0d', '%0a', '%0D', '%0A');
|
|
$url = _deep_replace($strip, $url);
|
|
$url = str_replace(';//', '://', $url);
|
|
/* If the URL doesn't appear to contain a scheme, we
|
|
* presume it needs http:// appended (unless a relative
|
|
* link starting with /, # or ? or a php file).
|
|
*/
|
|
if ( strpos($url, ':') === false && ! in_array( $url[0], array( '/', '#', '?' ) ) &&
|
|
! preg_match('/^[a-z0-9-]+?\.php/i', $url) )
|
|
$url = 'http://' . $url;
|
|
|
|
return Security::remove_XSS($url);
|
|
|
|
/*// Replace ampersands and single quotes only when displaying.
|
|
if ( 'display' == $_context ) {
|
|
$url = wp_kses_normalize_entities( $url );
|
|
$url = str_replace( '&', '&', $url );
|
|
$url = str_replace( "'", ''', $url );
|
|
}
|
|
|
|
if ( '/' === $url[0] ) {
|
|
$good_protocol_url = $url;
|
|
} else {
|
|
if ( ! is_array( $protocols ) )
|
|
$protocols = wp_allowed_protocols();
|
|
$good_protocol_url = wp_kses_bad_protocol( $url, $protocols );
|
|
if ( strtolower( $good_protocol_url ) != strtolower( $url ) )
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* Filter a string cleaned and escaped for output as a URL.
|
|
*
|
|
* @since 2.3.0
|
|
*
|
|
* @param string $good_protocol_url The cleaned URL to be returned.
|
|
* @param string $original_url The URL prior to cleaning.
|
|
* @param string $_context If 'display', replace ampersands and single quotes only.
|
|
*/
|
|
//return apply_filters( 'clean_url', $good_protocol_url, $original_url, $_context );98
|
|
}
|
|
|
|
|
|
/**
|
|
* Perform a deep string replace operation to ensure the values in $search are no longer present
|
|
*
|
|
* Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values
|
|
* e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that
|
|
* str_replace would return
|
|
*
|
|
* @since wordpress 2.8.1
|
|
* @access private
|
|
*
|
|
* @param string|array $search The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles.
|
|
* @param string $subject The string being searched and replaced on, otherwise known as the haystack.
|
|
* @return string The string with the replaced svalues.
|
|
*/
|
|
function _deep_replace( $search, $subject ) {
|
|
$subject = (string) $subject;
|
|
|
|
$count = 1;
|
|
while ( $count ) {
|
|
$subject = str_replace( $search, '', $subject, $count );
|
|
}
|
|
|
|
return $subject;
|
|
}
|
|
|
|
|
|
/**
|
|
* Callback to convert URL match to HTML A element.
|
|
*
|
|
* This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link
|
|
* make_clickable()}.
|
|
*
|
|
* @since wordpress 2.3.2
|
|
* @access private
|
|
*
|
|
* @param array $matches Single Regex Match.
|
|
* @return string HTML A element with URL address.
|
|
*/
|
|
function _make_web_ftp_clickable_cb($matches) {
|
|
$ret = '';
|
|
$dest = $matches[2];
|
|
$dest = 'http://' . $dest;
|
|
$dest = esc_url($dest);
|
|
if ( empty($dest) )
|
|
return $matches[0];
|
|
|
|
// removed trailing [.,;:)] from URL
|
|
if ( in_array( substr($dest, -1), array('.', ',', ';', ':', ')') ) === true ) {
|
|
$ret = substr($dest, -1);
|
|
$dest = substr($dest, 0, strlen($dest)-1);
|
|
}
|
|
return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>$ret";
|
|
}
|
|
|
|
/**
|
|
* Callback to convert email address match to HTML A element.
|
|
*
|
|
* This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link
|
|
* make_clickable()}.
|
|
*
|
|
* @since wordpress 2.3.2
|
|
* @access private
|
|
*
|
|
* @param array $matches Single Regex Match.
|
|
* @return string HTML A element with email address.
|
|
*/
|
|
function _make_email_clickable_cb($matches) {
|
|
$email = $matches[2] . '@' . $matches[3];
|
|
return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
|
|
}
|
|
|
|
/**
|
|
* Convert plaintext URI to HTML links.
|
|
*
|
|
* Converts URI, www and ftp, and email addresses. Finishes by fixing links
|
|
* within links.
|
|
*
|
|
* @since wordpress 0.71
|
|
*
|
|
* @param string $text Content to convert URIs.
|
|
* @return string Content with converted URIs.
|
|
*/
|
|
function make_clickable( $text ) {
|
|
$r = '';
|
|
$textarr = preg_split( '/(<[^<>]+>)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // split out HTML tags
|
|
$nested_code_pre = 0; // Keep track of how many levels link is nested inside <pre> or <code>
|
|
foreach ( $textarr as $piece ) {
|
|
|
|
if ( preg_match( '|^<code[\s>]|i', $piece ) || preg_match( '|^<pre[\s>]|i', $piece ) )
|
|
$nested_code_pre++;
|
|
elseif ( ( '</code>' === strtolower( $piece ) || '</pre>' === strtolower( $piece ) ) && $nested_code_pre )
|
|
$nested_code_pre--;
|
|
|
|
if ( $nested_code_pre || empty( $piece ) || ( $piece[0] === '<' && ! preg_match( '|^<\s*[\w]{1,20}+://|', $piece ) ) ) {
|
|
$r .= $piece;
|
|
continue;
|
|
}
|
|
|
|
// Long strings might contain expensive edge cases ...
|
|
if ( 10000 < strlen( $piece ) ) {
|
|
// ... break it up
|
|
foreach ( _split_str_by_whitespace( $piece, 2100 ) as $chunk ) { // 2100: Extra room for scheme and leading and trailing paretheses
|
|
if ( 2101 < strlen( $chunk ) ) {
|
|
$r .= $chunk; // Too big, no whitespace: bail.
|
|
} else {
|
|
$r .= make_clickable( $chunk );
|
|
}
|
|
}
|
|
} else {
|
|
$ret = " $piece "; // Pad with whitespace to simplify the regexes
|
|
|
|
$url_clickable = '~
|
|
([\\s(<.,;:!?]) # 1: Leading whitespace, or punctuation
|
|
( # 2: URL
|
|
[\\w]{1,20}+:// # Scheme and hier-part prefix
|
|
(?=\S{1,2000}\s) # Limit to URLs less than about 2000 characters long
|
|
[\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]*+ # Non-punctuation URL character
|
|
(?: # Unroll the Loop: Only allow puctuation URL character if followed by a non-punctuation URL character
|
|
[\'.,;:!?)] # Punctuation URL character
|
|
[\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]++ # Non-punctuation URL character
|
|
)*
|
|
)
|
|
(\)?) # 3: Trailing closing parenthesis (for parethesis balancing post processing)
|
|
~xS'; // The regex is a non-anchored pattern and does not have a single fixed starting character.
|
|
// Tell PCRE to spend more time optimizing since, when used on a page load, it will probably be used several times.
|
|
|
|
$ret = preg_replace_callback( $url_clickable, '_make_url_clickable_cb', $ret );
|
|
|
|
$ret = preg_replace_callback( '#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', '_make_web_ftp_clickable_cb', $ret );
|
|
$ret = preg_replace_callback( '#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret );
|
|
|
|
$ret = substr( $ret, 1, -1 ); // Remove our whitespace padding.
|
|
$r .= $ret;
|
|
}
|
|
}
|
|
|
|
// Cleanup of accidental links within links
|
|
$r = preg_replace( '#(<a([ \r\n\t]+[^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i', "$1$3</a>", $r );
|
|
return $r;
|
|
}
|
|
|
|
/**
|
|
* Breaks a string into chunks by splitting at whitespace characters.
|
|
* The length of each returned chunk is as close to the specified length goal as possible,
|
|
* with the caveat that each chunk includes its trailing delimiter.
|
|
* Chunks longer than the goal are guaranteed to not have any inner whitespace.
|
|
*
|
|
* Joining the returned chunks with empty delimiters reconstructs the input string losslessly.
|
|
*
|
|
* Input string must have no null characters (or eventual transformations on output chunks must not care about null characters)
|
|
*
|
|
* <code>
|
|
* _split_str_by_whitespace( "1234 67890 1234 67890a cd 1234 890 123456789 1234567890a 45678 1 3 5 7 90 ", 10 ) ==
|
|
* array (
|
|
* 0 => '1234 67890 ', // 11 characters: Perfect split
|
|
* 1 => '1234 ', // 5 characters: '1234 67890a' was too long
|
|
* 2 => '67890a cd ', // 10 characters: '67890a cd 1234' was too long
|
|
* 3 => '1234 890 ', // 11 characters: Perfect split
|
|
* 4 => '123456789 ', // 10 characters: '123456789 1234567890a' was too long
|
|
* 5 => '1234567890a ', // 12 characters: Too long, but no inner whitespace on which to split
|
|
* 6 => ' 45678 ', // 11 characters: Perfect split
|
|
* 7 => '1 3 5 7 9', // 9 characters: End of $string
|
|
* );
|
|
* </code>
|
|
*
|
|
* @since wordpress 3.4.0
|
|
* @access private
|
|
*
|
|
* @param string $string The string to split.
|
|
* @param int $goal The desired chunk length.
|
|
* @return array Numeric array of chunks.
|
|
*/
|
|
function _split_str_by_whitespace( $string, $goal ) {
|
|
$chunks = array();
|
|
|
|
$string_nullspace = strtr( $string, "\r\n\t\v\f ", "\000\000\000\000\000\000" );
|
|
|
|
while ( $goal < strlen( $string_nullspace ) ) {
|
|
$pos = strrpos( substr( $string_nullspace, 0, $goal + 1 ), "\000" );
|
|
|
|
if ( false === $pos ) {
|
|
$pos = strpos( $string_nullspace, "\000", $goal + 1 );
|
|
if ( false === $pos ) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
$chunks[] = substr( $string, 0, $pos + 1 );
|
|
$string = substr( $string, $pos + 1 );
|
|
$string_nullspace = substr( $string_nullspace, $pos + 1 );
|
|
}
|
|
|
|
if ( $string ) {
|
|
$chunks[] = $string;
|
|
}
|
|
|
|
return $chunks;
|
|
}
|
|
|
|
|
|
/**
|
|
* @desc This function does some parsing on the text that gets inputted. This parsing can be of any kind
|
|
* LaTeX notation, Word Censoring, Glossary Terminology (extension will available soon), Musical Notations, ...
|
|
* The inspiration for this filter function came from Moodle an phpBB who both use a similar approach.
|
|
* <code>[tex]\sqrt(2)[/tex]</code>
|
|
* @param $input string. some text
|
|
* @return $output string. some text that contains the parsed elements.
|
|
* @author Patrick Cool <patrick.cool@UGent.be>
|
|
* @version March 2OO6
|
|
*/
|
|
function text_filter($input, $filter = true) {
|
|
|
|
//$input = stripslashes($input);
|
|
|
|
if ($filter) {
|
|
// *** parse [tex]...[/tex] tags *** //
|
|
// which will return techexplorer or image html depending on the capabilities of the
|
|
// browser of the user (using some javascript that checks if the browser has the TechExplorer plugin installed or not)
|
|
//$input = _text_parse_tex($input);
|
|
|
|
// *** parse [teximage]...[/teximage] tags *** //
|
|
// these force the gif rendering of LaTeX using the mimetex gif renderer
|
|
//$input=_text_parse_tex_image($input);
|
|
|
|
// *** parse [texexplorer]...[/texexplorer] tags *** //
|
|
// these force the texeplorer LaTeX notation
|
|
//$input = _text_parse_texexplorer($input);
|
|
|
|
// *** Censor Words *** //
|
|
// censor words. This function removes certain words by [censored]
|
|
// this can be usefull when the campus is open to the world.
|
|
// $input=text_censor_words($input);
|
|
|
|
// *** parse [?]...[/?] tags *** //
|
|
// for the glossary tool
|
|
//$input = _text_parse_glossary($input);
|
|
|
|
// parse [wiki]...[/wiki] tags
|
|
// this is for the coolwiki plugin.
|
|
// $input=text_parse_wiki($input);
|
|
|
|
// parse [tool]...[/tool] tags
|
|
// this parse function adds a link to a certain tool
|
|
// $input=text_parse_tool($input);
|
|
|
|
// parse [user]...[/user] tags
|
|
|
|
// parse [email]...[/email] tags
|
|
|
|
// parse [code]...[/code] tags
|
|
}
|
|
|
|
return $input;
|
|
}
|
|
|
|
/**
|
|
* Applies parsing for tex commands that are separated by [tex]
|
|
* [/tex] to make it readable for techexplorer plugin.
|
|
* This function should not be accessed directly but should be accesse through the text_filter function
|
|
* @param string $text The text to parse
|
|
* @return string The text after parsing.
|
|
* @author Patrick Cool <patrick.cool@UGent.be>
|
|
* @version June 2004
|
|
*/
|
|
function _text_parse_tex($textext) {
|
|
//$textext = str_replace(array ("[tex]", "[/tex]"), array ('[*****]', '[/*****]'), $textext);
|
|
//$textext = stripslashes($texttext);
|
|
|
|
$input_array = preg_split("/(\[tex]|\[\/tex])/", $textext, -1, PREG_SPLIT_DELIM_CAPTURE);
|
|
|
|
foreach ($input_array as $key => $value) {
|
|
if ($key > 0 && $input_array[$key - 1] == '[tex]' AND $input_array[$key + 1] == '[/tex]') {
|
|
$input_array[$key] = latex_gif_renderer($value);
|
|
unset($input_array[$key - 1]);
|
|
unset($input_array[$key + 1]);
|
|
//echo 'LaTeX: <embed type="application/x-techexplorer" texdata="'.stripslashes($value).'" autosize="true" pluginspage="http://www.integretechpub.com/techexplorer/"><br />';
|
|
}
|
|
}
|
|
|
|
$output = implode('',$input_array);
|
|
return $output;
|
|
}
|
|
|
|
/**
|
|
* This function should not be accessed directly but should be accesse through the text_filter function
|
|
* @author Patrick Cool <patrick.cool@UGent.be>
|
|
*/
|
|
function _text_parse_glossary($input) {
|
|
return $input;
|
|
}
|
|
|
|
/**
|
|
* @desc This function makes a valid link to a different tool.
|
|
* This function should not be accessed directly but should be accesse through the text_filter function
|
|
* @author Patrick Cool <patrick.cool@UGent.be>
|
|
*/
|
|
function _text_parse_tool($input) {
|
|
// An array with all the valid tools
|
|
$tools[] = array(TOOL_ANNOUNCEMENT, 'announcements/announcements.php');
|
|
$tools[] = array(TOOL_CALENDAR_EVENT, 'calendar/agenda.php');
|
|
|
|
// Check if the name between the [tool] [/tool] tags is a valid one
|
|
}
|
|
|
|
/**
|
|
* Renders LaTeX code into a gif or retrieve a cached version of the gif.
|
|
* @author Patrick Cool <patrick.cool@UGent.be> Ghent University
|
|
*/
|
|
function latex_gif_renderer($latex_code) {
|
|
global $_course;
|
|
|
|
// Setting the paths and filenames
|
|
$mimetex_path = api_get_path(LIBRARY_PATH).'mimetex/';
|
|
$temp_path = api_get_path(SYS_COURSE_PATH).$_course['path'].'/temp/';
|
|
$latex_filename = md5($latex_code).'.gif';
|
|
|
|
if (!file_exists($temp_path.$latex_filename) OR isset($_GET['render'])) {
|
|
if (IS_WINDOWS_OS) {
|
|
$mimetex_command = $mimetex_path.'mimetex.exe -e "'.$temp_path.md5($latex_code).'.gif" '.escapeshellarg($latex_code).'';
|
|
} else {
|
|
$mimetex_command = $mimetex_path.'mimetex.cgi -e "'.$temp_path.md5($latex_code).'.gif" '.escapeshellarg($latex_code);
|
|
}
|
|
exec($mimetex_command);
|
|
//echo 'volgende shell commando werd uitgevoerd:<br /><pre>'.$mimetex_command.'</pre><hr>';
|
|
}
|
|
|
|
$return = "<a href=\"\" onclick=\"javascript: newWindow=window.open('".api_get_path(WEB_CODE_PATH)."inc/latex.php?code=".urlencode($latex_code)."&filename=$latex_filename','latexCode','toolbar=no,location=no,scrollbars=yes,resizable=yes,status=yes,width=375,height=250,left=200,top=100');\">";
|
|
$return .= '<img src="'.api_get_path(WEB_COURSE_PATH).$_course['path'].'/temp/'.$latex_filename.'" alt="'.$latex_code.'" border="0" /></a>';
|
|
return $return;
|
|
}
|
|
|
|
/**
|
|
* This functions cuts a paragraph
|
|
* i.e cut('Merry Xmas from Lima',13) = "Merry Xmas fr..."
|
|
* @param string The text to "cut"
|
|
* @param int Count of chars
|
|
* @param bool Whether to embed in a <span title="...">...</span>
|
|
* @return string
|
|
* */
|
|
function cut($text, $maxchar, $embed = false) {
|
|
if (api_strlen($text) > $maxchar) {
|
|
if ($embed) {
|
|
return '<span title="'.$text.'">'.api_substr($text, 0, $maxchar).'...</span>';
|
|
}
|
|
return api_substr($text, 0, $maxchar).' ...';
|
|
}
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Show a number as only integers if no decimals, but will show 2 decimals if exist.
|
|
*
|
|
* @param mixed Number to convert
|
|
* @param int Decimal points 0=never, 1=if needed, 2=always
|
|
* @return mixed An integer or a float depends on the parameter
|
|
*/
|
|
function float_format($number, $flag = 1) {
|
|
if (is_numeric($number)) {
|
|
if (!$number) {
|
|
$result = ($flag == 2 ? '0.'.str_repeat('0', EXERCISE_NUMBER_OF_DECIMALS) : '0');
|
|
} else {
|
|
|
|
if (floor($number) == $number) {
|
|
$result = number_format($number, ($flag == 2 ? EXERCISE_NUMBER_OF_DECIMALS : 0));
|
|
} else {
|
|
$result = number_format(round($number, 2), ($flag == 0 ? 0 : EXERCISE_NUMBER_OF_DECIMALS));
|
|
}
|
|
}
|
|
return $result;
|
|
}
|
|
}
|
|
|
|
// TODO: To be checked for correct timezone management.
|
|
/**
|
|
* Function to obtain last week timestamps
|
|
* @return array Times for every day inside week
|
|
*/
|
|
function get_last_week() {
|
|
$week = date('W');
|
|
$year = date('Y');
|
|
|
|
$lastweek = $week - 1;
|
|
if ($lastweek == 0) {
|
|
$week = 52;
|
|
$year--;
|
|
}
|
|
|
|
$lastweek = sprintf("%02d", $lastweek);
|
|
$arrdays = array();
|
|
for ($i = 1; $i <= 7; $i++) {
|
|
$arrdays[] = strtotime("$year"."W$lastweek"."$i");
|
|
}
|
|
return $arrdays;
|
|
}
|
|
|
|
/**
|
|
* Gets the week from a day
|
|
* @param string Date in UTC (2010-01-01 12:12:12)
|
|
* @return int Returns an integer with the week number of the year
|
|
*/
|
|
function get_week_from_day($date) {
|
|
if (!empty($date)) {
|
|
$time = api_strtotime($date,'UTC');
|
|
return date('W', $time);
|
|
} else {
|
|
return date('W');
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Deprecated functions
|
|
*/
|
|
|
|
/**
|
|
* Applies parsing the content for tex commands that are separated by [tex]
|
|
* [/tex] to make it readable for techexplorer plugin.
|
|
* @param string $text The text to parse
|
|
* @return string The text after parsing.
|
|
* @author Patrick Cool <patrick.cool@UGent.be>
|
|
* @version June 2004
|
|
*/
|
|
function api_parse_tex($textext) {
|
|
/*
|
|
if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false) {
|
|
return str_replace(array('[tex]', '[/tex]'), array("<object classid=\"clsid:5AFAB315-AD87-11D3-98BB-002035EFB1A4\"><param name=\"autosize\" value=\"true\" /><param name=\"DataType\" value=\"0\" /><param name=\"Data\" value=\"", "\" /></object>"), $textext);
|
|
}
|
|
return str_replace(array('[tex]', '[/tex]'), array("<embed type=\"application/x-techexplorer\" texdata=\"", "\" autosize=\"true\" pluginspage=\"http://www.integretechpub.com/techexplorer/\">"), $textext);
|
|
*/
|
|
return $textext;
|
|
}
|
|
|
|
/**
|
|
* Applies parsing for tex commandos that are seperated by [tex]
|
|
* [/tex] to make it readable for techexplorer plugin.
|
|
* This function should not be accessed directly but should be accesse through the text_filter function
|
|
* @param string $text The text to parse
|
|
* @return string The text after parsing.
|
|
* @author Patrick Cool <patrick.cool@UGent.be>
|
|
* @version June 2004
|
|
*/
|
|
function _text_parse_texexplorer($textext) {
|
|
/*
|
|
if (strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE')) {
|
|
$textext = str_replace(array("[texexplorer]", "[/texexplorer]"), array("<object classid=\"clsid:5AFAB315-AD87-11D3-98BB-002035EFB1A4\"><param name=\"autosize\" value=\"true\" /><param name=\"DataType\" value=\"0\" /><param name=\"Data\" value=\"", "\" /></object>"), $textext);
|
|
} else {
|
|
$textext = str_replace(array("[texexplorer]", "[/texexplorer]"), array("<embed type=\"application/x-techexplorer\" texdata=\"", "\" autosize=\"true\" pluginspage=\"http://www.integretechpub.com/techexplorer/\">"), $textext);
|
|
}
|
|
return $textext;
|
|
*/
|
|
return $textext;
|
|
}
|
|
|
|
/**
|
|
* This function splits the string into words and then joins them back together again one by one.
|
|
* Example: "Test example of a long string"
|
|
* substrwords(5) = Test ... *
|
|
* @param string
|
|
* @param int the max number of character
|
|
* @param string how the string will be end
|
|
* @return a reduce string
|
|
*/
|
|
|
|
function substrwords($text,$maxchar,$end='...')
|
|
{
|
|
if(strlen($text)>$maxchar)
|
|
{
|
|
$words=explode(" ",$text);
|
|
$output = '';
|
|
$i=0;
|
|
while(1)
|
|
{
|
|
$length = (strlen($output)+strlen($words[$i]));
|
|
if($length>$maxchar)
|
|
{
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
$output = $output." ".$words[$i];
|
|
$i++;
|
|
};
|
|
};
|
|
}
|
|
else
|
|
{
|
|
$output = $text;
|
|
return $output;
|
|
}
|
|
return $output.$end;
|
|
}
|
|
|
|
function implode_with_key($glue, $array) {
|
|
if (!empty($array)) {
|
|
$string = '';
|
|
foreach($array as $key => $value) {
|
|
if (empty($value)) {
|
|
$value = 'null';
|
|
}
|
|
$string .= $key." : ".$value." $glue ";
|
|
}
|
|
return $string;
|
|
}
|
|
return '';
|
|
}
|
|
|
|
|
|
/**
|
|
* Transform the file size in a human readable format.
|
|
*
|
|
* @param int $file_size Size of the file in bytes
|
|
* @return string A human readable representation of the file size
|
|
*/
|
|
function format_file_size($file_size)
|
|
{
|
|
$file_size = intval($file_size);
|
|
if ($file_size >= 1073741824) {
|
|
$file_size = round($file_size / 1073741824 * 100) / 100 . 'G';
|
|
} elseif($file_size >= 1048576) {
|
|
$file_size = round($file_size / 1048576 * 100) / 100 . 'M';
|
|
} elseif($file_size >= 1024) {
|
|
$file_size = round($file_size / 1024 * 100) / 100 . 'k';
|
|
} else {
|
|
$file_size = $file_size . 'B';
|
|
}
|
|
return $file_size;
|
|
}
|
|
|
|
function return_datetime_from_array($array)
|
|
{
|
|
$year = '0000';
|
|
$month = $day = $hours = $minutes = $seconds = '00';
|
|
if (isset($array['Y']) && (isset($array['F']) || isset($array['M'])) && isset($array['d']) && isset($array['H']) && isset($array['i'])) {
|
|
$year = $array['Y'];
|
|
$month = isset($array['F'])?$array['F']:$array['M'];
|
|
if (intval($month) < 10 ) $month = '0'.$month;
|
|
$day = $array['d'];
|
|
if (intval($day) < 10 ) $day = '0'.$day;
|
|
$hours = $array['H'];
|
|
if (intval($hours) < 10 ) $hours = '0'.$hours;
|
|
$minutes = $array['i'];
|
|
if (intval($minutes) < 10 ) $minutes = '0'.$minutes;
|
|
}
|
|
if (checkdate($month,$day,$year)) {
|
|
$datetime = $year.'-'.$month.'-'.$day.' '.$hours.':'.$minutes.':'.$seconds;
|
|
}
|
|
return $datetime;
|
|
}
|
|
|
|
/**
|
|
* Converts an string CLEANYO[admin][amann,acostea]
|
|
* into an array:
|
|
*
|
|
* array(
|
|
* CLEANYO
|
|
* admin
|
|
* amann,acostea
|
|
* )
|
|
*
|
|
* @param $array
|
|
* @return array
|
|
*/
|
|
function bracketsToArray($array)
|
|
{
|
|
return preg_split('/[\[\]]+/', $array, -1, PREG_SPLIT_NO_EMPTY);
|
|
}
|
|
|
|
/**
|
|
* @param string $string
|
|
* @param bool $capitalizeFirstCharacter
|
|
* @return mixed
|
|
*/
|
|
function underScoreToCamelCase($string, $capitalizeFirstCharacter = true)
|
|
{
|
|
$str = str_replace(' ', '', ucwords(str_replace('_', ' ', $string)));
|
|
|
|
if (!$capitalizeFirstCharacter) {
|
|
$str[0] = strtolower($str[0]);
|
|
}
|
|
|
|
return $str;
|
|
}
|
|
|