HTML
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<?
include "tagtrack.php";
class parser
{
var $neutralize_post;
var $replace_word_list;
var $replace_ltr_list;
var $in_tag_ltr_replace;
var $tags;
function parser ()
{
$this->replace_word_list = array
(
);
$this->replace_ltr_list = array
(
""" => "\"",
"'" => "\'"
);
$this->in_tag_ltr_replace = array
(
""" => " ",
"'" => " "
);
$this->tags = array
(
"table" => new TagTrack ("table", true, array("tr") ),
"tr" => new TagTrack ("tr", false, array("td") ),
"td" => new TagTrack ("td", false, "*" ),
"br" => new TagTrack ("br", true, "" ),
"a" => new TagTrack ("a", true, "*" ),
"div" => new TagTrack ("div", true, "*" ),
"em" => new TagTrack ("em", true, "*" ),
"pre" => new TagTrack ("pre", true, "*" ),
"font" => new TagTrack ("font", true, "*" ),
"s" => new TagTrack ("s", true, "*" ),
"b" => new TagTrack ("b", true, "*" ),
"u" => new TagTrack ("u", true, "*" ),
"center" => new TagTrack ("center", true, "*" ),
"blockquote" => new TagTrack ("blockquote", true, "*" ),
"i" => new TagTrack ("i", true, "*" ),
"p" => new TagTrack ("p", true, "*" ),
"li" => new TagTrack ("li", true, "*" ),
"image" => new TagTrack ("image", true, "" )
);
}
function NextWord ($string, $i, $delim, $entity)
{
$wrd="";
for (;$i<strlen($string);$i++)
{
$ltr = $string[$i];
if ($entity[$ltr])
{
if (!$wrd) return $ltr;
$i--;
return $wrd;
}
if ($delim[$ltr] && $wrd) return $wrd;
if ($this->replace_ltr_list[$ltr]) $ltr=$this->replace_ltr_list[$ltr];
$wrd = $wrd.$ltr;
}
return $wrd;
}
function TagScan ($string, &$i, $tag_count)
{
$i++;
$closing = 0;
$delim = array (" " => 1, ">" => 1, "'" => 1, """ => 1);
$entitie = array ();
$word = $this->NextWord ($string, &$i, $delim, $entitie);
$tag = strtolower ($word);
if ($tag[0] == "/")
{
$closing = 1;
$tag = substr ($tag, 1);
}
if ($this->tags[$tag])
{
if (!$this->tags[$tag]->VerifyTag($closing)) $this->neutralize_post = "<font color=red>You have an error in your HTML near $word</font>";
}
else $word = $this->neutralize_post = "<font color=red>$tag not permitted</font>";
$word = $word." ";
for (;$string[$i] != ">" && $i<strlen($string);$i++)
{
if (!$this->in_tag_ltr_replace[$string[$i]]) $word = $word.$string[$i];
$word.$this->in_tag_ltr_replace[$string[$i]];
}
return ("<".trim($word).">");
}
function EscapeScan ($string, $i)
{
$i++;
$word ="";
for (;$string[$i] != "\" && $i < strlen ($string); $i++)
{
$word = $word.$string[$i];
}
$i++;
return (htmlentities($word));
}
function scan ($string)
{
global $tag_stack;
$tag_stack = array();
$text="";
$string = $string." ";
$this->neutralize_post="";
$delim = array (" " => 1);
$entitie = array ("<" => 1, "\" => 1);
for ($i=0;$i<strlen($string);$i++)
{
$word = $this->NextWord ($string, &$i, $delim, $entitie);
if ($word == "\")
{
$text = $text.$this->EscapeScan ($string, &$i);
continue;
}
if ($this->replace_word_list[$word])
{
$text = $text.$this->replace_word_list[$word];
continue;
}
if ($word == "<") $word = $this->TagScan ($string, &$i, &$tag_count);
if (count ($tag_stack) > 20) $this->neutralize_post = "WAY TO MUCH NESTING, STOP IT";
if ($this->neutralize_post) return(htmlentities(addslashes($string)).$this->neutralize_post);
$text = $text." ".$word;
}
if ($c = end ($tag_stack)) return (htmlentities(addslashes($string))."YOUR HTML TAG <font color=red> $c->label </font> MAY NOT BE COMPLETED");
return ($text);
}
}
?>
//and here is the tagtrack class, which checks the
//validity of nested HTML tags.
<?
$tag_stack = array();
class TagTrack
{
var $label;
var $top_level;
var $follower;
function TagTrack ($label, $top_level = 1, $followers = 0)
{
$this->label = $label;
$this->top_level = $top_level;
$this->followers = $followers;
}
function VerifyTag ($closing)
{
global $tag_stack;
$prev=end($tag_stack);
if ($closing)
{
if ($this->label = $prev->label)
{
array_pop ($tag_stack);
return ($this->label);
}
else return (0);
}
if ($prev && $pf = $prev->followers)
{
if (is_array ($pf) && !in_array ($this->label, $pf))
return (0);
elseif ($pf == "*" && !$this->top_level)
return (0);
}
if ($this->followers)
array_push ($tag_stack, $this);
return ($this->label);
}
}
?>
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