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Generic filter function. It's a reworked version of the old glossary

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filter and is now more efficient.(SE)
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moodler 2005-03-04 10:10:24 +00:00
parent 8c6d5d6ac8
commit a039c3af28
1 changed files with 196 additions and 0 deletions
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lib/filterlib.php Normal file
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<?php
class filterobject {
var $phrase;
var $hreftagbegin;
var $hreftagend;
var $casesensitive;
var $fullmatch;
/// a constructor just because I like constructing
function filterobject($phrase, $hreftagbegin='<span class="highlight">', $hreftagend='</span>', $casesensitive=false, $fullmatch=false) {
$this->phrase = $phrase;
$this->hreftagbegin = $hreftagbegin;
$this->hreftagend = $hreftagend;
$this->casesensitive = $casesensitive;
$this->fullmatch = $fullmatch;
}
}
/**
param text the text that we are filtering
param link_array an array of filterobjects
param ignoretagsopen an array of opening tags that we should ignore while filtering
param ignoretagsclose an array of corresponding closing tags
**/
function filter_phrases ($text, $link_array, $ignoretagsopen=NULL, $ignoretagsclose=NULL) {
/// A list of open/close tags that we should not replace within
/// No reason why you can't put full preg expressions in here too
/// eg '<script(.+?)>' to match any type of script tag
$filterignoretagsopen = array('<head>' , '<nolink>' , '<span class="nolink">');
$filterignoretagsclose = array('</head>', '</nolink>', '</span>');
/// Invalid prefixes and suffixes for the fullmatch searches
$filterinvalidprefixes = '([a-zA-Z0-9])';
$filterinvalidsuffixes = '([a-zA-Z0-9])';
/// Add the user defined ignore tags to the default list
/// Unless specified otherwise, we will not replace within <a></a> tags
if ( $ignoretagsopen === NULL ) {
$ignoretagsopen = array('<a(.+?)>');
$ignoretagsclose = array('</a>');
}
if ( is_array($ignoretagsopen) ) {
$filterignoretagsopen += $ignoretagsopen; // gotta love PHP's array handling!
$filterignoretagsclose += $ignoretagsclose;
}
/// Remove everything enclosed by the ignore tags from $text
$ignoretags = array();
foreach ($filterignoretagsopen as $key=>$opentag) {
$closetag = $filterignoretagsclose[$key];
/// form regular expression
$closetag = str_replace('/','\/',$closetag); // delimit forward slashes
$pregexp = '/'.$opentag.'(.+?)'.$closetag.'/is';
preg_match_all($pregexp, $text, $list_of_ignores);
foreach (array_unique($list_of_ignores[0]) as $key=>$value) {
$ignoretags['<~'.$key.'~>'] = $value;
}
if (!empty($ignoretags)) {
$text = str_replace($ignoretags,array_keys($ignoretags),$text);
}
}
/// Remove tags from $text
$tags = array();
preg_match_all('/<(.+?)>/is',$text,$list_of_tags);
foreach (array_unique($list_of_tags[0]) as $key=>$value) {
$tags['<|'.$key.'|>'] = $value;
}
if (!empty($tags)) {
$text = str_replace($tags,array_keys($tags),$text);
}
/// Time to cycle through each phrase to be linked
foreach ($link_array as $linkobject) {
/// Set some defaults if certain properties are missing
/// Properties may be missing if the filterobject class has not been used to construct the object
if (!isset($linkobject->phrase)) {
continue;
}
if (!isset($linkobject->hreftagbegin) or !isset($linkobject->hreftagend)) {
$linkobject->hreftagbegin = '<span class="highlight"';
$linkobject->hreftagend = '</span>';
}
if (!isset($linkobject->casesensitive)) {
$linkobject->casesensitive = false;
}
if (!isset($linkobject->fullmatch)) {
$linkobject->fullmatch = false;
}
/// Avoid integers < 1000 to be linked. See bug 1446.
$intcurrent = intval($linkobject->phrase);
if (!empty($intcurrent) && strval($intcurrent) == $linkobject->phrase && $intcurrent < 1000) {
continue;
}
/// Strip tags out of the phrase
$linkobject->phrase = strip_tags($linkobject->phrase);
/// Quote any regular expression characters and the delimiter
$linkobject->phrase = preg_quote($linkobject->phrase, '/');
/// Regular expression modifiers
$modifiers = ($linkobject->casesensitive) ? 's' : 'is';
/// Do we need to do a fullmatch?
/// If yes then go through and remove any non full matching entries
if ($linkobject->fullmatch) {
$notfullmatches = array();
$regexp = '/'.$filterinvalidprefixes.'('.$linkobject->phrase.')|('.$linkobject->phrase.')'.$filterinvalidsuffixes.'/'.$modifiers;
preg_match_all($regexp,$text,$list_of_notfullmatches);
if ($list_of_notfullmatches) {
foreach (array_unique($list_of_notfullmatches[0]) as $key=>$value) {
$notfullmatches['<*'.$key.'*>'] = $value;
}
if (!empty($notfullmatches)) {
$text = str_replace($notfullmatches,array_keys($notfullmatches),$text);
}
}
}
/// Finally we do our highlighting
$text = preg_replace('/('.$linkobject->phrase.')/'.$modifiers, $linkobject->hreftagbegin.'$1'.$linkobject->hreftagend, $text);
/// Replace the not full matches before cycling to next link object
if (!empty($notfullmatches)) {
$text = str_replace(array_keys($notfullmatches),$notfullmatches,$text);
unset($notfullmatches);
}
/// We need to remove any tags we've just added
if (!isset($newtagsarray)) {
$newtagsarray = array();
}
$newtagsprefix = (string)(count($newtagsarray) + 1);
$newtags = array();
preg_match_all('/<(.+?)>/is',$text,$list_of_newtags);
foreach (array_unique($list_of_newtags[0]) as $key=>$value) {
$newtags['<|'.$newtagsprefix.'.'.$key.'|>'] = $value;
}
if (!empty($newtags)) {
$text = str_replace($newtags,array_keys($newtags),$text);
$newtagsarray[] = $newtags;
}
}
/// Rebuild the text with all the excluded areas
if (!empty($newtagsarray)) {
$newtagsarray = array_reverse($newtagsarray, true);
foreach ($newtagsarray as $newtags) {
$text = str_replace(array_keys($newtags), $newtags, $text);
}
}
if (!empty($tags)) {
$text = str_replace(array_keys($tags),$tags,$text);
}
if (!empty($ignoretags)) {
$text = str_replace(array_keys($ignoretags),$ignoretags,$text);
}
return $text;
}
?>