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weblib.php
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weblib.php
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<?PHP // $Id$
///////////////////////////////////////////////////////////////////////////
// weblib.php - functions for web output
//
// Library of all general-purpose Moodle PHP functions and constants
// that produce HTML output
//
///////////////////////////////////////////////////////////////////////////
// //
// NOTICE OF COPYRIGHT //
// //
// Moodle - Modular Object-Oriented Dynamic Learning Environment //
// http://moodle.com //
// //
// Copyright (C) 2001-2003 Martin Dougiamas http://dougiamas.com //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation; either version 2 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details: //
// //
// http://www.gnu.org/copyleft/gpl.html //
// //
///////////////////////////////////////////////////////////////////////////
/// Constants
/// Define text formatting types ... eventually we can add Wiki, BBcode etc
define("FORMAT_MOODLE", "0"); // Does all sorts of transformations and filtering
define("FORMAT_HTML", "1"); // Plain HTML (with some tags stripped)
define("FORMAT_PLAIN", "2"); // Plain text (even tags are printed in full)
define("FORMAT_WIKI", "3"); // Wiki-formatted text
define("FORMAT_MARKDOWN", "4"); // Markdown-formatted text http://daringfireball.net/projects/markdown/
$ALLOWED_TAGS =
"<p><br><b><i><u><font><table><tbody><span><div><tr><td><th><ol><ul><dl><li><dt><dd><h1><h2><h3><h4><h5><h6><hr><img><a><strong><emphasis><em><sup><sub><address><cite><blockquote><pre><strike><embed><object><param><acronym><nolink><style><lang><tex><algebra><math><mi><mn><mo><mtext><mspace><ms><mrow><mfrac><msqrt><mroot><mstyle><merror><mpadded><mphantom><mfenced><msub><msup><msubsup><munder><mover><munderover><mmultiscripts><mtable><mtr><mtd><maligngroup><malignmark><maction><cn><ci><apply><reln><fn><interval><inverse><sep><condition><declare><lambda><compose><ident><quotient><exp><factorial><divide><max><min><minus><plus><power><rem><times><root><gcd><and><or><xor><not><implies><forall><exists><abs><conjugate><eq><neq><gt><lt><geq><leq><ln><log><int><diff><partialdiff><lowlimit><uplimit><bvar><degree><set><list><union><intersect><in><notin><subset><prsubset><notsubset><notprsubset><setdiff><sum><product><limit><tendsto><mean><sdev><variance><median><mode><moment><vector><matrix><matrixrow><determinant><transpose><selector><annotation><semantics><annotation-xml><tt><code>";
$ALLOWED_PROTOCOLS = array('http', 'https', 'ftp', 'news', 'mailto', 'rtsp', 'teamspeak', 'gopher', 'color');
/// Functions
function s($var) {
/// returns $var with HTML characters (like "<", ">", etc.) properly quoted,
if (empty($var)) {
return "";
}
return htmlSpecialChars(stripslashes_safe($var));
}
function p($var) {
/// prints $var with HTML characters (like "<", ">", etc.) properly quoted,
if (empty($var)) {
echo "";
}
echo htmlSpecialChars(stripslashes_safe($var));
}
function nvl(&$var, $default="") {
/// if $var is undefined, return $default, otherwise return $var
return isset($var) ? $var : $default;
}
function strip_querystring($url) {
/// takes a URL and returns it without the querystring portion
if ($commapos = strpos($url, '?')) {
return substr($url, 0, $commapos);
} else {
return $url;
}
}
function get_referer() {
/// returns the URL of the HTTP_REFERER, less the querystring portion
return strip_querystring(nvl($_SERVER["HTTP_REFERER"]));
}
function me() {
/// returns the name of the current script, WITH the querystring portion.
/// this function is necessary because PHP_SELF and REQUEST_URI and SCRIPT_NAME
/// return different things depending on a lot of things like your OS, Web
/// server, and the way PHP is compiled (ie. as a CGI, module, ISAPI, etc.)
if (!empty($_SERVER["REQUEST_URI"])) {
return $_SERVER["REQUEST_URI"];
} else if (!empty($_SERVER["PHP_SELF"])) {
if (!empty($_SERVER["QUERY_STRING"])) {
return $_SERVER["PHP_SELF"]."?".$_SERVER["QUERY_STRING"];
}
return $_SERVER["PHP_SELF"];
} else if (!empty($_SERVER["SCRIPT_NAME"])) {
if (!empty($_SERVER["QUERY_STRING"])) {
return $_SERVER["SCRIPT_NAME"]."?".$_SERVER["QUERY_STRING"];
}
return $_SERVER["SCRIPT_NAME"];
} else if (!empty($_SERVER["URL"])) { // May help IIS (not well tested)
if (!empty($_SERVER["QUERY_STRING"])) {
return $_SERVER["URL"]."?".$_SERVER["QUERY_STRING"];
}
return $_SERVER["URL"];
} else {
notify("Warning: Could not find any of these web server variables: \$REQUEST_URI, \$PHP_SELF, \$SCRIPT_NAME or \$URL");
return false;
}
}
function qualified_me() {
/// like me() but returns a full URL
if (!empty($_SERVER["HTTP_HOST"])) {
$hostname = $_SERVER["HTTP_HOST"];
} else if (!empty($_ENV["HTTP_HOST"])) {
$hostname = $_ENV["HTTP_HOST"];
} else if (!empty($_SERVER["SERVER_NAME"])) {
$hostname = $_SERVER["SERVER_NAME"];
} else if (!empty($_ENV["SERVER_NAME"])) {
$hostname = $_ENV["SERVER_NAME"];
} else {
notify("Warning: could not find the name of this server!");
return false;
}
$protocol = (isset($_SERVER["HTTPS"]) and $_SERVER["HTTPS"] == "on") ? "https://" : "http://";
$url_prefix = $protocol.$hostname;
return $url_prefix . me();
}
function match_referer($goodreferer = "") {
/// returns true if the referer is the same as the goodreferer. If
/// goodreferer is not specified, use qualified_me as the goodreferer
global $CFG;
if (empty($CFG->secureforms)) { // Don't bother checking referer
return true;
}
if ($goodreferer == "nomatch") { // Don't bother checking referer
return true;
}
if (empty($goodreferer)) {
$goodreferer = qualified_me();
}
$referer = get_referer();
return (($referer == $goodreferer) or ($referer == "$CFG->wwwroot/"));
}
function data_submitted($url="") {
/// Used on most forms in Moodle to check for data
/// Returns the data as an object, if it's found.
/// This object can be used in foreach loops without
/// casting because it's cast to (array) automatically
///
/// Checks that submitted POST data exists, and also
/// checks the referer against the given url (it uses
/// the current page if none was specified.
global $CFG;
if (empty($_POST)) {
return false;
} else {
if (match_referer($url)) {
return (object)$_POST;
} else {
if ($CFG->debug > 10) {
notice("The form did not come from this page! (referer = ".get_referer().")");
}
return false;
}
}
}
function stripslashes_safe($string) {
/// stripslashes() removes ALL backslashes even from strings
/// so C:\temp becomes C:temp ... this isn't good.
/// The following should work as a fairly safe replacement
/// to be called on quoted AND unquoted strings (to be sure)
$string = str_replace("\\'", "'", $string);
$string = str_replace('\\"', '"', $string);
//$string = str_replace('\\\\', '\\', $string); // why?
return $string;
}
function break_up_long_words($string, $maxsize=20, $cutchar=' ') {
/// Given some normal text, this function will break up any
/// long words to a given size, by inserting the given character
if (in_array(current_language(), array('ja', 'zh_cn', 'zh_tw', 'zh_tw_utf8'))) { // Multibyte languages
return $string;
}
$output = '';
$length = strlen($string);
$wordlength = 0;
for ($i=0; $i<$length; $i++) {
$char = $string[$i];
if ($char == ' ' or $char == "\t" or $char == "\n" or $char == "\r") {
$wordlength = 0;
} else {
$wordlength++;
if ($wordlength > $maxsize) {
$output .= $cutchar;
$wordlength = 0;
}
}
$output .= $char;
}
return $output;
}
if (!function_exists('str_ireplace')) { /// Only exists in PHP 5
function str_ireplace($find, $replace, $string) {
/// This does a search and replace, ignoring case
/// This function is only used for versions of PHP older than version 5
/// which do not have a native version of this function.
/// Taken from the PHP manual, by bradhuizenga @ softhome.net
if (!is_array($find)) {
$find = array($find);
}
if(!is_array($replace)) {
if (!is_array($find)) {
$replace = array($replace);
} else {
// this will duplicate the string into an array the size of $find
$c = count($find);
$rString = $replace;
unset($replace);
for ($i = 0; $i < $c; $i++) {
$replace[$i] = $rString;
}
}
}
foreach ($find as $fKey => $fItem) {
$between = explode(strtolower($fItem),strtolower($string));
$pos = 0;
foreach($between as $bKey => $bItem) {
$between[$bKey] = substr($string,$pos,strlen($bItem));
$pos += strlen($bItem) + strlen($fItem);
}
$string = implode($replace[$fKey],$between);
}
return ($string);
}
}
if (!function_exists('stripos')) { /// Only exists in PHP 5
function stripos($haystack, $needle, $offset=0) {
/// This function is only used for versions of PHP older than version 5
/// which do not have a native version of this function.
/// Taken from the PHP manual, by dmarsh @ spscc.ctc.edu
return strpos(strtoupper($haystack), strtoupper($needle), $offset);
}
}
function read_template($filename, &$var) {
/// return a (big) string containing the contents of a template file with all
/// the variables interpolated. all the variables must be in the $var[] array or
/// object (whatever you decide to use).
///
/// WARNING: do not use this on big files!!
$temp = str_replace("\\", "\\\\", implode(file($filename), ""));
$temp = str_replace('"', '\"', $temp);
eval("\$template = \"$temp\";");
return $template;
}
function checked(&$var, $set_value = 1, $unset_value = 0) {
/// if variable is set, set it to the set_value otherwise set it to the
/// unset_value. used to handle checkboxes when you are expecting them from
/// a form
if (empty($var)) {
$var = $unset_value;
} else {
$var = $set_value;
}
}
function frmchecked(&$var, $true_value = "checked", $false_value = "") {
/// prints the word "checked" if a variable is true, otherwise prints nothing,
/// used for printing the word "checked" in a checkbox form input
if ($var) {
echo $true_value;
} else {
echo $false_value;
}
}
function link_to_popup_window ($url, $name="popup", $linkname="click here",
$height=400, $width=500, $title="Popup window", $options="none", $return=false) {
/// This will create a HTML link that will work on both
/// Javascript and non-javascript browsers.
/// Relies on the Javascript function openpopup in javascript.php
/// $url must be relative to home page eg /mod/survey/stuff.php
global $CFG;
if ($options == "none") {
$options = "menubar=0,location=0,scrollbars,resizable,width=$width,height=$height";
}
$fullscreen = 0;
$link = "<a target=\"$name\" title=\"$title\" href=\"$CFG->wwwroot$url\" ".
"onClick=\"return openpopup('$url', '$name', '$options', $fullscreen);\">$linkname</a>\n";
if ($return) {
return $link;
} else {
echo $link;
}
}
function button_to_popup_window ($url, $name="popup", $linkname="click here",
$height=400, $width=500, $title="Popup window", $options="none") {
/// This will create a HTML link that will work on both
/// Javascript and non-javascript browsers.
/// Relies on the Javascript function openpopup in javascript.php
/// $url must be relative to home page eg /mod/survey/stuff.php
global $CFG;
if ($options == "none") {
$options = "menubar=0,location=0,scrollbars,resizable,width=$width,height=$height";
}
$fullscreen = 0;
echo "<input type=\"button\" name=\"popupwindow\" title=\"$title\" value=\"$linkname ...\" ".
"onClick=\"return openpopup('$url', '$name', '$options', $fullscreen);\">\n";
}
function close_window_button() {
/// Prints a simple button to close a window
echo "<center>\n";
echo "<script>\n";
echo "<!--\n";
echo "document.write('<form>');\n";
echo "document.write('<input type=\"button\" onClick=\"self.close();\" value=\"".get_string("closewindow")."\" />');\n";
echo "document.write('</form>');\n";
echo "-->\n";
echo "</script>\n";
echo "<noscript>\n";
echo "<a href=\"".$_SERVER['HTTP_REFERER']."\"><---</a>\n";
echo "</noscript>\n";
echo "</center>\n";
}
function choose_from_menu ($options, $name, $selected="", $nothing="choose", $script="", $nothingvalue="0", $return=false) {
/// Given an array of value, creates a popup menu to be part of a form
/// $options["value"]["label"]
if ($nothing == "choose") {
$nothing = get_string("choose")."...";
}
if ($script) {
$javascript = "onChange=\"$script\"";
} else {
$javascript = "";
}
$output = "<select name=\"$name\" $javascript>\n";
if ($nothing) {
$output .= " <option value=\"$nothingvalue\"\n";
if ($nothingvalue === $selected) {
$output .= " selected=\"true\"";
}
$output .= ">$nothing</option>\n";
}
if (!empty($options)) {
foreach ($options as $value => $label) {
$output .= " <option value=\"$value\"";
if ($value == $selected) {
$output .= " selected=\"true\"";
}
if ($label === "") {
$output .= ">$value</option>\n";
} else {
$output .= ">$label</option>\n";
}
}
}
$output .= "</select>\n";
if ($return) {
return $output;
} else {
echo $output;
}
}
function popup_form ($common, $options, $formname, $selected="", $nothing="choose", $help="", $helptext="", $return=false, $targetwindow="self") {
/// Implements a complete little popup form
/// $common = the URL up to the point of the variable that changes
/// $options = A list of value-label pairs for the popup list
/// $formname = name must be unique on the page
/// $selected = the option that is already selected
/// $nothing = The label for the "no choice" option
/// $help = The name of a help page if help is required
/// $helptext = The name of the label for the help button
/// $return = Boolean indicating whether the function should return the text
/// as a string or echo it directly to the page being rendered
// TODO:
//
// * Make sure it's W3C conformant (<form name=""> has to go for example)
// * Code it in a way that doesn't require JS to be on. Example code:
// $selector .= '<form method="get" action="" style="display: inline;"><span>';
// $selector .= '<input type="hidden" name="var" value="value" />';
// if(!empty($morevars)) {
// $getarray = explode('&', $morevars);
// foreach($getarray as $thisvar) {
// $selector .= '<input type="hidden" name="'.strtok($thisvar, '=').'" value="'.strtok('=').'" />';
// }
// }
// $selector .= '<select name="" onchange="form.submit();">';
// foreach($options as $id => $text) {
// $selector .= "\n<option value='$id'";
// if($option->id == $selected) {
// $selector .= ' selected';
// }
// $selector .= '>'.$text."</option>\n";
// }
// $selector .= '</select>';
// $selector .= '<noscript id="unique_id" style="display: inline;"> <input type="submit" value="'.get_string('somestring').'" /></noscript>';
// $selector .= '<script type="text/javascript">'."\n<!--\n".'document.getElementById("unique_id").style.display = "none";'."\n<!--\n".'</script>';
// $selector .= '</span></form>';
//
global $CFG;
if (empty($options)) {
return '';
}
if ($nothing == "choose") {
$nothing = get_string("choose")."...";
}
$startoutput = "<form method=\"get\" target=\"{$CFG->framename}\" name=\"$formname\">";
$output = "<select name=\"popup\" onchange=\"$targetwindow.location=document.$formname.popup.options[document.$formname.popup.selectedIndex].value\">\n";
if ($nothing != "") {
$output .= " <option value=\"javascript:void(0)\">$nothing</option>\n";
}
foreach ($options as $value => $label) {
if (substr($label,0,2) == "--") {
$output .= " <optgroup label=\"$label\"></optgroup>"; // Plain labels
continue;
} else {
$output .= " <option value=\"$common$value\"";
if ($value == $selected) {
$output .= " selected=\"true\"";
}
}
if ($label) {
$output .= ">$label</option>\n";
} else {
$output .= ">$value</option>\n";
}
}
$output .= "</select>";
$output .= "</form>\n";
if ($help) {
$button = helpbutton($help, $helptext, 'moodle', true, false, '', true);
} else {
$button = '';
}
if ($return) {
return $startoutput.$button.$output;
} else {
echo $startoutput.$button.$output;
}
}
function formerr($error) {
/// Prints some red text
if (!empty($error)) {
echo "<font color=\"#ff0000\">$error</font>";
}
}
function validate_email ($address) {
/// Validates an email to make sure it makes sense.
return (ereg('^[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+'.
'@'.
'[-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+\.'.
'[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+$',
$address));
}
function detect_munged_arguments($string, $allowdots=1) {
if (substr_count($string, '..') > $allowdots) { // Sometimes we allow dots in references
return true;
}
if (ereg('[\|\`]', $string)) { // check for other bad characters
return true;
}
if (empty($string) or $string == '/') {
return true;
}
return false;
}
function get_slash_arguments($file="file.php") {
/// Searches the current environment variables for some slash arguments
if (!$string = me()) {
return false;
}
$pathinfo = explode($file, $string);
if (!empty($pathinfo[1])) {
return $pathinfo[1];
} else {
return false;
}
}
function parse_slash_arguments($string, $i=0) {
/// Extracts arguments from "/foo/bar/something"
/// eg http://mysite.com/script.php/foo/bar/something
if (detect_munged_arguments($string)) {
return false;
}
$args = explode("/", $string);
if ($i) { // return just the required argument
return $args[$i];
} else { // return the whole array
array_shift($args); // get rid of the empty first one
return $args;
}
}
function format_text_menu() {
/// Just returns an array of formats suitable for a popup menu
return array (FORMAT_MOODLE => get_string("formattext"),
FORMAT_HTML => get_string("formathtml"),
FORMAT_PLAIN => get_string("formatplain"),
FORMAT_WIKI => get_string("formatwiki"),
FORMAT_MARKDOWN => get_string("formatmarkdown"));
}
function format_text($text, $format=FORMAT_MOODLE, $options=NULL, $courseid=NULL ) {
/// Given text in a variety of format codings, this function returns
/// the text as safe HTML.
///
/// $text is raw text (originally from a user)
/// $format is one of the format constants, defined above
global $CFG, $course;
if (!empty($CFG->cachetext)) {
$time = time() - $CFG->cachetext;
$md5key = md5($text);
if ($cacheitem = get_record_select('cache_text', "md5key = '$md5key' AND timemodified > '$time'")) {
return $cacheitem->formattedtext;
}
}
if (empty($courseid)) {
if (!empty($course->id)) { // An ugly hack for better compatibility
$courseid = $course->id;
}
}
$CFG->currenttextiscacheable = true; // Default status - can be changed by any filter
switch ($format) {
case FORMAT_HTML:
replace_smilies($text);
if (!isset($options->noclean)) {
$text = clean_text($text, $format);
}
$text = filter_text($text, $courseid);
break;
case FORMAT_PLAIN:
$text = htmlentities($text);
$text = rebuildnolinktag($text);
$text = str_replace(" ", " ", $text);
$text = nl2br($text);
break;
case FORMAT_WIKI:
$text = wiki_to_html($text,$courseid);
$text = rebuildnolinktag($text);
if (!isset($options->noclean)) {
$text = clean_text($text, $format);
}
$text = filter_text($text, $courseid);
break;
case FORMAT_MARKDOWN:
$text = markdown_to_html($text);
if (!isset($options->noclean)) {
$text = clean_text($text, $format);
}
replace_smilies($text);
$text = filter_text($text, $courseid);
break;
default: // FORMAT_MOODLE or anything else
if (!isset($options->smiley)) {
$options->smiley=true;
}
if (!isset($options->para)) {
$options->para=true;
}
if (!isset($options->newlines)) {
$options->newlines=true;
}
$text = text_to_html($text, $options->smiley, $options->para, $options->newlines);
if (!isset($options->noclean)) {
$text = clean_text($text, $format);
}
$text = filter_text($text, $courseid);
break;
}
if (!empty($CFG->cachetext) and $CFG->currenttextiscacheable) {
$newrecord->md5key = $md5key;
$newrecord->formattedtext = addslashes($text);
$newrecord->timemodified = time();
@insert_record('cache_text', $newrecord);
}
return $text;
}
function format_text_email($text, $format) {
/// Given text in a variety of format codings, this function returns
/// the text as plain text suitable for plain email.
///
/// $text is raw text (originally from a user)
/// $format is one of the format constants, defined above
switch ($format) {
case FORMAT_PLAIN:
return $text;
break;
case FORMAT_WIKI:
$text = wiki_to_html($text);
/// This expression turns links into something nice in a text format. (Russell Jungwirth)
/// From: http://php.net/manual/en/function.eregi-replace.php and simplified
$text = eregi_replace('(<a [^<]*href=["|\']?([^ "\']*)["|\']?[^>]*>([^<]*)</a>)','\\3 [ \\2 ]', $text);
return strtr(strip_tags($text), array_flip(get_html_translation_table(HTML_ENTITIES)));
break;
case FORMAT_HTML:
return html_to_text($text);
break;
case FORMAT_MOODLE:
case FORMAT_MARKDOWN:
default:
$text = eregi_replace('(<a [^<]*href=["|\']?([^ "\']*)["|\']?[^>]*>([^<]*)</a>)','\\3 [ \\2 ]', $text);
return strtr(strip_tags($text), array_flip(get_html_translation_table(HTML_ENTITIES)));
break;
}
}
function filter_text($text, $courseid=NULL) {
/// Given some text in HTML format, this function will pass it
/// through any filters that have been defined in $CFG->textfilterx
/// The variable defines a filepath to a file containing the
/// filter function. The file must contain a variable called
/// $textfilter_function which contains the name of the function
/// with $courseid and $text parameters
global $CFG;
if (!empty($CFG->textfilters)) {
$textfilters = explode(',', $CFG->textfilters);
foreach ($textfilters as $textfilter) {
if (is_readable("$CFG->dirroot/$textfilter/filter.php")) {
include_once("$CFG->dirroot/$textfilter/filter.php");
$functionname = basename($textfilter).'_filter';
if (function_exists($functionname)) {
$text = $functionname($courseid, $text);
}
}
}
}
return $text;
}
function clean_text($text, $format=FORMAT_MOODLE) {
/// Given raw text (eg typed in by a user), this function cleans it up
/// and removes any nasty tags that could mess up Moodle pages.
global $ALLOWED_TAGS;
switch ($format) {
case FORMAT_PLAIN:
return $text;
default:
/// Remove tags that are not allowed
$text = strip_tags($text, $ALLOWED_TAGS);
/// Remove script events
$text = eregi_replace("([^a-z])language([[:space:]]*)=", "\\1Xlanguage=", $text);
$text = eregi_replace("([^a-z])on([a-z]+)([[:space:]]*)=", "\\1Xon\\2=", $text);
/// Clean up embedded scripts and , using kses
$text = cleanAttributes($text);
return $text;
}
}
function cleanAttributes($str){
/// This function takes a string and examines it for html tags.
/// If tags are detected it passes the string to a helper function cleanAttributes2
/// which checks for attributes and filters them for malicious content
/// 17/08/2004 :: Eamon DOT Costello AT dcu DOT ie
$result = preg_replace(
'%(<[^>]*(>|$)|>)%me', #search for html tags
"cleanAttributes2('\\1')",
$str
);
return $result;
}
function cleanAttributes2($htmlTag){
/// This function takes a string with an html tag and strips out any unallowed
/// protocols e.g. javascript:
/// It calls ancillary functions in kses which are prefixed by kses
/// 17/08/2004 :: Eamon DOT Costello AT dcu DOT ie
global $CFG, $ALLOWED_PROTOCOLS;
require_once("$CFG->libdir/kses.php");
$htmlTag = kses_stripslashes($htmlTag);
if (substr($htmlTag, 0, 1) != '<') {
return '>'; //a single character ">" detected
}
if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $htmlTag, $matches)) {
return ''; // It's seriously malformed
}
$slash = trim($matches[1]); //trailing xhtml slash
$elem = $matches[2]; //the element name
$attrlist = $matches[3]; // the list of attributes as a string
$attrArray = kses_hair($attrlist, $ALLOWED_PROTOCOLS);
$attStr = '';
foreach ($attrArray as $arreach) {
$attStr .= ' '.strtolower($arreach['name']).'="'.$arreach['value'].'" ';
}
$xhtml_slash = '';
if (preg_match('%/\s*$%', $attrlist)) {
$xhtml_slash = ' /';
}
return "<$slash$elem$attStr$xhtml_slash>";
}
function replace_smilies(&$text) {
/// Replaces all known smileys in the text with image equivalents
global $CFG;
/// this builds the mapping array only once
static $runonce = false;
static $e = array();
static $img = array();
static $emoticons = array(
':-)' => 'smiley',
':)' => 'smiley',
':-D' => 'biggrin',
';-)' => 'wink',
':-/' => 'mixed',
'V-.' => 'thoughtful',
':-P' => 'tongueout',
'B-)' => 'cool',
'^-)' => 'approve',
'8-)' => 'wideeyes',
':o)' => 'clown',
':-(' => 'sad',
':(' => 'sad',
'8-.' => 'shy',
':-I' => 'blush',
':-X' => 'kiss',
'8-o' => 'surprise',
'P-|' => 'blackeye',
'8-[' => 'angry',
'xx-P' => 'dead',
'|-.' => 'sleepy',
'}-]' => 'evil',
);
if ($runonce == false) { /// After the first time this is not run again
foreach ($emoticons as $emoticon => $image){
$alttext = get_string($image, 'pix');
$e[] = $emoticon;
$img[] = "<img alt=\"$alttext\" width=\"15\" height=\"15\" src=\"$CFG->pixpath/s/$image.gif\" />";
}
$runonce = true;
}
// Exclude from transformations all the code inside <script> tags
// Needed to solve Bug 1185. Thanks to jouse 2001 detecting it. :-)
// Based on code from glossary fiter by Williams Castillo.
// - Eloy
// Detect all the <script> zones to take out
$excludes = array();
preg_match_all('/<script language(.+?)<\/script>/is',$text,$list_of_excludes);
// Take out all the <script> zones from text
foreach (array_unique($list_of_excludes[0]) as $key=>$value) {
$excludes['<+'.$key.'+>'] = $value;
}
if ($excludes) {
$text = str_replace($excludes,array_keys($excludes),$text);
}
/// this is the meat of the code - this is run every time
$text = str_replace($e, $img, $text);
// Recover all the <script> zones to text
if ($excludes) {
$text = str_replace(array_keys($excludes),$excludes,$text);
}
}
function text_to_html($text, $smiley=true, $para=true, $newlines=true) {
/// Given plain text, makes it into HTML as nicely as possible.
/// May contain HTML tags already
global $CFG;
/// Remove any whitespace that may be between HTML tags
$text = eregi_replace(">([[:space:]]+)<", "><", $text);
/// Remove any returns that precede or follow HTML tags
$text = eregi_replace("([\n\r])<", " <", $text);
$text = eregi_replace(">([\n\r])", "> ", $text);
convert_urls_into_links($text);
/// Make returns into HTML newlines.
if ($newlines) {
$text = nl2br($text);
}
/// Turn smileys into images.
if ($smiley) {
replace_smilies($text);
}
/// Wrap the whole thing in a paragraph tag if required
if ($para) {
return "<p>".$text."</p>";
} else {
return $text;
}
}
function wiki_to_html($text,$courseid) {
/// Given Wiki formatted text, make it into XHTML using external function
global $CFG;
require_once("$CFG->libdir/wiki.php");
$wiki = new Wiki;
return $wiki->format($text,$courseid);
}
function markdown_to_html($text) {
/// Given Markdown formatted text, make it into XHTML using external function
global $CFG;
require_once("$CFG->libdir/markdown.php");
return Markdown($text);
}
function html_to_text($html) {
/// Given HTML text, make it into plain text using external function
global $CFG;
require_once("$CFG->libdir/html2text.php");
return html2text($html);
}
function convert_urls_into_links(&$text) {
/// Given some text, it converts any URLs it finds into HTML links.
/// Make lone URLs into links. eg http://moodle.com/
$text = eregi_replace("([[:space:]]|^|\(|\[)([[:alnum:]]+)://([^[:space:]]*)([[:alnum:]#?/&=])",
"\\1<a href=\"\\2://\\3\\4\" target=\"newpage\">\\2://\\3\\4</a>", $text);
/// eg www.moodle.com
$text = eregi_replace("([[:space:]]|^|\(|\[)www\.([^[:space:]]*)([[:alnum:]#?/&=])",
"\\1<a href=\"http://www.\\2\\3\" target=\"newpage\">www.\\2\\3</a>", $text);
}
function highlight($needle, $haystack, $case=0,
$left_string="<span class=\"highlight\">", $right_string="</span>") {
/// This function will highlight search words in a given string
/// It cares about HTML and will not ruin links. It's best to use
/// this function after performing any conversions to HTML.
/// Function found here: http://forums.devshed.com/t67822/scdaa2d1c3d4bacb4671d075ad41f0854.html
if (empty($needle)) {
return $haystack;
}
$list_of_words = eregi_replace("[^-a-zA-Z0-9&']", " ", $needle);
$list_array = explode(" ", $list_of_words);
for ($i=0; $i<sizeof($list_array); $i++) {
if (strlen($list_array[$i]) == 1) {
$list_array[$i] = "";
}
}
$list_of_words = implode(" ", $list_array);
$list_of_words_cp = $list_of_words;
$final = array();
preg_match_all('/<(.+?)>/is',$haystack,$list_of_words);
foreach (array_unique($list_of_words[0]) as $key=>$value) {
$final['<|'.$key.'|>'] = $value;
}
$haystack = str_replace($final,array_keys($final),$haystack);
$list_of_words_cp = eregi_replace(" +", "|", $list_of_words_cp);
if ($list_of_words_cp{0}=="|") {
$list_of_words_cp{0} = "";
}
if ($list_of_words_cp{strlen($list_of_words_cp)-1}=="|") {
$list_of_words_cp{strlen($list_of_words_cp)-1}="";
}
$list_of_words_cp = "(".trim($list_of_words_cp).")";
if (!$case){
$haystack = eregi_replace("$list_of_words_cp", "$left_string"."\\1"."$right_string", $haystack);
} else {
$haystack = ereg_replace("$list_of_words_cp", "$left_string"."\\1"."$right_string", $haystack);
}
$haystack = str_replace(array_keys($final),$final,$haystack);