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<?PHP
/**
* @version $Id: kunena.parser.base.php 4336 2011-01-31 06:05:12Z severdia $
* Kunena Component
* @package Kunena
*
* @Copyright (C) 2008 - 2011 Kunena Team. All rights reserved.
* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL
* @link http://www.kunena.org
*
* Based on FireBoard Component
* @Copyright (C) 2006 - 2007 Best Of Joomla All rights reserved.
* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL
* @link http://www.bestofjoomla.com
**/
/*
############################################################################
# CATEGORY: Parser.TagParser DEVELOPMENT DATUM: 13.11.2007 #
# VERSION: 00.08.00 LAST EDIT DATUM: 12.12.2007 #
# FILENAME: kunena.parser.base.php #
# AUTOR: Miro Dietiker, MD Systems, All rights reserved. #
# LICENSE: http://www.gnu.org/copyleft/gpl.html GNU/GPL #
# CONTACT: m.dietiker@md-systems.ch � 2007 Miro Dietiker 13.11.2007 #
############################################################################
# This parser is based on an earlier CMS parser implementation.
# It has been completely rewritten and generalized for Kunena and
# was also heavily tested.
# However it should be: extensible, fast, ungreedy regarding resources
# stateful, enforcing strict output rules as defined
# Hope it works ;-)
############################################################################
# PARSER SPECS
# Nonrecursive parsing
# Linear analisys, onepass translation
# Warranted encoding
# Specific parsing rules implementable
# Flexible event based user processing
# ERROR
# RemoveOrEscape into interpreter?
# parser reduce parse steps
# change ParseNext, UnEscape, ParseTag, CheckTag
# separate run instead task passing
*/
defined( '_JEXEC' ) or die();
define('TAGPARSER_RET_OK', 0);
define('TAGPARSER_RET_ERR', 1);
define('TAGPARSER_RET_NOTHING', 0);
define('TAGPARSER_RET_REPLACED', 1);
define('TAGPARSER_RET_RECURSIVE', 2);
/*
# NO SUPPORT FOR RECURSIVE Standard & Extended REPARSING IMPLEMENTED
# IF NEEDED, CALL RECURSION INSIDE PARSER, HANDLE DOUBLE ENCODE YOURSELF
# PARSING (Tag-Support):
# [img noborder]
# [img='bildname']
# [img name='bla' x='10' y='20' html='']
# [img from='http://www.domain.ch/x.gif' x='10' y='20']
# [img name='bla' x='10' y='20']
# [img name="bla" x="10" y="20"]
# is_a >PHP4.2.0
*/
class TagParser {
// main parser class
function TagParser() {
// Constructor
}
function Parse(&$task) {
// Parses Text for tag-based transformation of task text
// remove=1 -> Remove Tags with illegal Content
// fast access
$interpreter =& $task->interpreter;
$skip = $task->dry;
$remove = $task->drop_errtag;
// output text is input text
$text =& $task->text;
// internal state pass
$pos_act =& $task->pos_act;
$pos_act = 0;
$pos_encode_last =& $task->pos_encode_last;
$pos_encode_last = 0; // encode as soon as a matching tag is executed
$st =& $task->st;
$st = Array(); $sti = 0; // stackarr and TopPositionOfStack
// scan for candidate of tag
$textlen = strlen($text);
$pos = 0;
while($pos<$textlen) {
// next tag candidate
if($interpreter->ParseNext($task)!==TAGPARSER_RET_OK) {
break; // terminate event
}
// tag start detected - no further manipulation of inner functions except offset
$tag_start = $pos_act;
// verify escape, remove escape
if($interpreter->UnEscape($task)==TAGPARSER_RET_REPLACED) {
// was escaped, cancel tag, did unescape, continue after pos
// no further linear encoding - later on
continue; // terminate event
}
// parse UNescaped STARTORENDTAG-Start [ found
$tag = NULL;
if($interpreter->ParseTag($tag, $task)
!==TAGPARSER_RET_OK) {
// ERROR SEPARATE FROM UNSUPPORTED REMOVES
$offset = 0;
$this->RemoveOrEncode($offset, $task, $tag_start, $tag->tag_end, 'parsetag');
$pos_act += $offset;
unset($offset); // opt
continue; // continue (if needed) after tag
}
$tag_end = $tag->tag_end;
//echo 'TAG:'.$tag_start.":".$tag_end.":".$tag->name;
//echo "\n";
//var_dump($tag);
//echo "\n";
// verify tag validity content
if($interpreter->CheckTag($task, $tag)
!==TAGPARSER_RET_OK) {
// ERROR SEPARATE FROM UNSUPPORTED REMOVES
// we have found a syntactically correct tag, check semantics or remove
// ERROR ENCODE WOULD BE WRONG!! (DOUBLE ENCODE LATER ON)
$offset = 0;
$this->RemoveOrEncode($offset, $task, $tag_start, $tag_end, 'checktag');
$pos_act += $offset;
unset($offset); // opt
continue; // continue (if needed) after tag
}
// now realtag!
// linear encode till current tag
$encode_len = $tag_start-$pos_encode_last;
$textnew = '';
if(!$skip
&& ($task->interpreter->Encode($textnew, $task
, substr($text, $pos_encode_last, $encode_len), 'text')
!==TAGPARSER_RET_NOTHING)) {
// Replaced
$encode_diff = strlen($textnew)-$encode_len;
$text = substr($text, 0, $pos_encode_last)
.$textnew.substr($text, $tag_start);
$tag->Offset($encode_diff);
$tag_start += $encode_diff;
$tag_end += $encode_diff;
$pos_act += $encode_diff;
unset($encode_diff); //opt
//echo 'ENCODE:'.$pos_encode_last.":".$tag_start.":";
//echo "\n";
}
unset($textnew); // opt
$pos_encode_last = $tag_start;
unset($encode_len); //opt
// tag length
$tag_len = $tag_end-$tag_start+1; // [<5x<6]<7 7-5=2
// go tag events
//echo 'CLASS:'.get_class($tag);
//echo "\n";
//if(get_class($tag)=='ParserEventTagEnd') {
//if(strget_class($tag)=='ParserEventTagEnd') {
if(is_a($tag, 'ParserEventTagEnd')) {
// ENDTAG found
$i=$sti-1;
// seek tag on stack
while($i>=0) {
$temp = $st[$i];
if($temp->name==$tag->name) {
// $i representing index of starting tag
break;
}
$i--;
}
unset($temp); // opt
if($i==-1) {
// Tag not on Stack -> Ignore
// endtag without start -- illegal in any case - no event
$err = new ParserErrorContext('parser.err.tag.nostart');
$err->GrabContext($task, $tag);
$task->ErrorPush($err);
unset($err); //opt
if($remove) {
// remove tag, continue on prev tagstart
$text = substr($text, 0, $tag_start).substr($text, $tag_end+1);
$pos_act = $tag_start;
} else {
// tag wrong, linear encoding follows! continue parsing after
$pos_act = $tag_end+1;
}
// option would be to encode it as tagremove
continue;
}
// Tag on Stack at Pos $i -> reduce stack to $i IF needed!
while($sti>($i+1)) {
// pop top
--$sti;
$starttag =& $st[$sti];
$starttag_len = $starttag->tag_end-$starttag->tag_start+1;
// late event
$tag_new = NULL;
if($interpreter->TagSingleLate($tag_new, $task, $starttag)
!==TAGPARSER_RET_NOTHING) {
if($skip) {
continue;
}
// tag replacement
$templen = strlen($tag_new)-$starttag_len;
$text = substr($text, 0, $starttag->tag_start)
.$tag_new.substr($text, $starttag->tag_end+1);
// marks are always behind tag!
$tag->Offset($templen);
$tag_start += $templen;
$tag_end += $templen;
$pos_act += $templen;
unset($templen); //opt
continue;
} else {
// bad tag on stack (open tag only)
$err = new ParserErrorContext('parser.err.tag.remain');
$err->GrabContext($task, $starttag);
$task->ErrorPush($err);
unset($err); //opt
$offset = 0;
$this->RemoveOrEncode($offset, $task, $starttag->tag_start, $starttag->tag_end, 'unsupported');
// was tag from stack - so all indices are behind
$tag->Offset($offset);
$tag_start += $offset;
$tag_end += $offset;
$pos_encode_last += $offset;
$pos_act += $offset;
unset($offset); //opt
continue; // continue (if needed) after tag
}
unset($starttag, $starttag_len); //opt
}
unset($i); //opt
// Pop Top-Element (Actual)
unset($st[$sti]); //opt
$sti--;
$starttag =& $st[$sti];
// TRY STD-&EXT-TAG-REPLACEMENT OR KILL TAGS (START & END)
$tag_new = $tag_new_start = $tag_new_end = NULL;
if($task->interpreter->TagStandard($tag_new_start, $tag_new_end, $task
, $starttag)
!==TAGPARSER_RET_NOTHING) {
if($skip) {
continue;
}
// length in between tags
$midlen = $tag_start-$starttag->tag_end-1;
$text = substr($text, 0, $starttag->tag_start).$tag_new_start
.substr($text, $starttag->tag_end+1, $midlen)
.$tag_new_end.substr($text, $tag_end+1);
// To Starttag End
$totallen = strlen($tag_new_start)+$midlen+strlen($tag_new_end);
$pos_act = $starttag->tag_start+$totallen;
// linear encoding continue after
$pos_encode_last = $pos_act;
unset($midlen, $totallen); //opt
} else if($task->interpreter->TagExtended($tag_new, $task, $starttag,
substr($text, $starttag->tag_end+1, $tag_start-$starttag->tag_end-1))
!==TAGPARSER_RET_NOTHING) {
if($skip) {
continue;
}
$text = substr($text, 0, $starttag->tag_start)
.$tag_new.substr($text, $tag_end+1);
$templen = strlen($tag_new);
// linear encoding continue after
$pos_encode_last = $pos_act = $starttag->tag_start+$templen;
unset($templen); //opt
} else {
// UNSUPPORTED TAG
$err = new ParserErrorContext('parser.err.tag.unsupported');
$err->GrabContext($task, $starttag);
$task->ErrorPush($err);
unset($err); //opt
$offset_start = $offset_end = 0;
$this->RemoveOrEncode($offset_end, $task, $tag_start, $tag_end, 'unsupported');
$this->RemoveOrEncode($offset_start, $task, $starttag->tag_start, $starttag->tag_end, 'unsupported');
$tag->Offset($offset_end+$offset_start);
$pos_act += $offset_end+$offset_start;
$pos_encode_last = $pos_act;
unset($offset_end, $offset_start); //opt
}
unset($starttag); //opt
} else {
// STARTTAG FOUND
$tag_new = NULL;
$kind = $task->interpreter->TagSingle($tag_new, $task, $tag);
if($kind!==TAGPARSER_RET_NOTHING) {
if($skip) {
continue;
}
$text = substr($text, 0, $tag_start).$tag_new.substr($text, $tag_end+1);
if($kind==TAGPARSER_RET_RECURSIVE) {
// recursive parsing possible, start from prev tagposition!
$pos_act = $tag_start;
$pos_encode_last = $pos_act;
} else {
$templen = strlen($tag_new);
// NONrecursive parsing
$pos_act = $tag_start+$templen; // parse continue after
$pos_encode_last = $pos_act; // linear encoding continue after
}
} else {
// PUSH new ELEM
$st[$sti] = $tag; // not by ref -- store & forget
unset($tag);
$sti++;
$pos_act = $tag_end+1; // parse continue after
$pos_encode_last = $pos_act; // linear encoding continue after
}
}
}
// encode last linear part
$textnew = '';
if(!$skip
&& ($task->interpreter->Encode($textnew, $task, substr($text, $pos_encode_last), 'text')
!==TAGPARSER_RET_NOTHING)) {
$text = substr($text, 0, $pos_encode_last).$textnew;
}
unset($textnew); //opt
// empty stack, stack should be empty
while($sti>0) {
// pop top
--$sti;
$starttag =& $st[$sti];
$starttag_len = $starttag->tag_end-$starttag->tag_start+1;
//var_dump($starttag);
// late event
$tag_new = NULL;
if($interpreter->TagSingleLate($tag_new, $task, $starttag)
!==TAGPARSER_RET_NOTHING) {
if($skip) {
continue;
}
// tag replacement
$text = substr($text, 0, $starttag->tag_start)
.$tag_new.substr($text, $starttag->tag_end+1);
// no more marks tag_start ... pos_act
} else {
// bad tag on stack
$err = new ParserErrorContext('parser.err.tag.remain');
$err->GrabContext($task, $starttag);
$task->ErrorPush($err);
unset($err); //opt
$offset = 0;
$this->RemoveOrEncode($offset, $task, $starttag->tag_start, $starttag->tag_end, 'unsupported');
// no more marks tag_start ... pos_act
unset($offset); //opt
}
unset($starttag, $starttag_len); //opt
}
$task->interpreter->PostProcessing($task);
if(count($task->errarr)) {
return TAGPARSER_RET_ERR;
}
return TAGPARSER_RET_OK;
}
function RemoveOrEncode(&$offset, &$task, $tag_start, $tag_end, $context) {
// Remove or encode tag range
//echo "ROE:".$tag_start.":".$tag_end.":".$task->text;
//echo "\n";
// SKIP handling on request
if($task->dry) {
return TAGPARSER_RET_OK;
}
$offset = 0;
$text =& $task->text;
$tag_len = $tag_end-$tag_start+1;
if($task->drop_errtag) {
// Remove
//echo 'DROP';
//echo "\n";
$text = substr($text, 0, $tag_start)
.substr($text, $tag_end+1);
$offset = -$tag_len;
} else {
// encode tag with context
$textnew = '';
if($task->interpreter->Encode($textnew, $task
, substr($text, $tag_start, $tag_len)
, 'tagremove.'.$context)
!==TAGPARSER_RET_NOTHING) {
// Replaced
$text = substr($text, 0, $tag_start)
.$textnew.substr($text, $tag_end+1);
$offset = strlen($textnew)-$tag_len;
}
}
//echo "ROEE:".$task->text;
//echo "\n";
return TAGPARSER_RET_OK;
}
}
class TagInterpreter {
// class to define interface and describe event types
var $parser = NULL;
function TagInterpreter(&$parser, $parent) {
// Interpreter constructor
$this->parser =& $parser;
$this->parent = $parent;
}
function &NewTask() {
// Builds new Task
// RET
// object: the task object
// TAGPARSER_RET_ERR: error creating
$task = new ParserTask($this);
return $task;
}
// All Parse functions need no parent call
function ParseNext(&$task) {
// Parse next candidate for execution
// Candidate could be cancelled later on!
// $text: the full text
// &$pos_act: position to begin parsing
// RET:
// TAGPARSER_RET_OK: found candidate
// TAGPARSER_RET_ERR: end of parsing, latest occurence
return TAGPARSER_RET_ERR;
}
function UnEscape(&$task) {
// Check if current tag is escaped, unescape
// Linear encoding is done later on!
// This escape only prevents tag parser from early tag identification abort
// RET:
// TAGPARSER_RET_NOTHING: No Escaping done, continue
// TAGPARSER_RET_REPLACED: Escaping done
// Default: Say there are no escaped value - treat it as tag
return TAGPARSER_RET_NOTHING;
}
function ParseTag(&$tag, &$task) {
// Parse Tag content and create construct
// Tag is getting omitted if TAGPARSER_RET_ERR (later encoded as text)
// $pos_end MUST be >$task->tag_start on exit
// RET:
// TAGPARSER_RET_OK continue
// TAGPARSER_RET_ERR tag parse error, skip
return TAGPARSER_RET_ERR;
}
function CheckTag(&$task, $tag) {
// Check tag content for conformity to drop wrong
// RET:
// TAGPARSER_RET_OK OK
// TAGPARSER_RET_ERR with $err
return TAGPARSER_RET_ERR;
}
// All String functions need consideration for parent calls!
function Encode(&$text_new, &$task, $text_old, $context) {
// Encode strings for output
// Regard interpreter mode if needed
// IN: $text_old, $context
// As simple strings
// OUT: $tag_new
// As full replacement
// context: 'text'
// context: 'tagremove.parsetag', 'tagremove.checktag', 'tagremove.unsupported'
// RET:
// TAGPARSER_RET_NOTHING: No Encoding done
// TAGPARSER_RET_REPLACED: Encoding done
return TAGPARSER_RET_NOTHING;
}
// All Tag functions need no parent calls!
function TagSingle(&$tag_new, &$task, $tag) {
// Funktion replaces TAGs with corresponding
// IN: $tag As object
// OUT: $tag_new As full replacement
// RET:
// TAGPARSER_RET_NOTHING: None done
// TAGPARSER_RET_REPLACED: done recursive
// TAGPARSER_RET_RECURSIVE: done nonrecursive
// NOTE: return 0 means later TagStandard on close event or TagSingleLate
return TAGPARSER_RET_NOTHING;
}
function TagStandard(&$tag_new_start, &$tag_new_end, &$task, $tag) {
// Function replaces TAGs with corresponding
// IN: $tag As object
// OUT: $tag_new_start, $tag_new_end
// As tag replacement
// RET:
// TAGPARSER_RET_NOTHING: None done
// TAGPARSER_RET_REPLACED: done recursive
// TAGPARSER_RET_RECURSIVE: done nonrecursive (UNIMPLEMENTED)
// NOTE: return 0 means TagExtended is checked
return TAGPARSER_RET_NOTHING;
}
function TagExtended(&$tag_new, &$task, $tag, $between) {
// Funktion replaces TAGs with corresponding
// IN: $tag, between As object, between text
// OUT: $tag_new As full replacement
// RET:
// TAGPARSER_RET_NOTHING: None done
// TAGPARSER_RET_REPLACED: done recursive
// TAGPARSER_RET_RECURSIVE: done nonrecursive (UNIMPLEMENTED)
// NOTE: TAGPARSER_RET_NOTHING means finally unsupported tag
return TAGPARSER_RET_NOTHING;
}
function TagSingleLate(&$tag_new, &$task, $tag) {
// Funktion replaces TAGs with corresponding
// IN: $tag As object
// OUT: $tag_new As full replacement
// RET:
// TAGPARSER_RET_NOTHING: None done
// TAGPARSER_RET_REPLACED: done recursive
// TAGPARSER_RET_RECURSIVE: done nonrecursive
// NOTE: return TAGPARSER_RET_NOTHING means unsupported
return TAGPARSER_RET_NOTHING;
}
function PostProcessing(&$task)
{
// Override if post processing is required...
}
}
class ParserTask {
// A specific Task to get parsed continuing parser states
// object assoc
var $interpreter = NULL;
// persistent process data
var $errarr = array();
var $text = NULL;
// config
// dry run, disables replacements
var $dry = FALSE;
// drop errortag drops each tag producing errors
var $drop_errtag = FALSE;
// run specific
// stack
var $st = array();
// scan states
var $pos_act = 0;
// encode as soon as a matching tag is executed
var $pos_encode_last = 0;
function ParserTask($interpreter) {
// DO NOT CALL DIRECTLY:
// use $interpreter->NewTask()
$this->interpreter =& $interpreter;
}
function setText($text) {
// define new text to parse
$this->text = $text;
return TAGPARSER_RET_OK;
}
function Reset() {
// Reset this tasks' error state
$this->errarr = array();
return TAGPARSER_RET_OK;
}
function Parse($text=NULL) {
// Parse this task
if($text!==NULL) {
$this->text = $text;
}
// call parser framework
// ERROR REMOVE (, 1)??
return $this->interpreter->parser->Parse($this);
}
function ErrorPush($err) {
// Push err to tasks ErrorArray
$this->errarr[] = $err;
}
}
class ParserEvent {
// A ParserEvent happens on TagInterpreter::ParseTag
var $tag_start = NULL;
var $tag_end = NULL;
var $name = '';
function ParserEvent($tag_start, $tag_end, $name) {
// Constructor
$this->tag_start = $tag_start;
$this->tag_end = $tag_end;
$this->name = $name;
}
function Offset($offset) {
// Move tag by offset (case replace prev tags)
$this->tag_start += $offset;
$this->tag_end += $offset;
}
}
class ParserEventTag extends ParserEvent {
// Representing a starttag with options
// Derive from to put tags with special infos on stack
var $options = array();
function setOptions($opt) {
// clone
$this->options = $opt;
}
}
class ParserEventTagEnd extends ParserEvent {
// Representing an endtag
}
class ParserErrorContext {
// A dump of a present TagParser::Parse error state with context
var $error;
var $pos = NULL;
var $text = NULL;
var $tag = NULL;
function ParserErrorContext($error) {
// Constructor
$this->error = $error;
}
function GrabContext($task, $tag=NULL) {
// Grab Context state of this error via COPY. This is a dump
// keep in mind, pos is after encoding, not input related!
$this->pos = $task->pos_act;
// pos -errtext_neg +errtext_pos
$this->text = substr($task->text, $task->pos_act-10, $task->pos_act+20);
// snip bigger and store real pos?
// tag
if($tag!==NULL) {
$this->tag = $tag;
$this->pos = $tag->tag_start;
$tag_len = $tag->tag_end-$tag->tag_start+1;
$this->text = substr($task->text, $tag->tag_start, $tag_len);
// snip bigger and store real pos?
}
// input counters instead of output counters?!
// could also grab line number? (parse for in parser)
}
function Show() {
// Show this error
echo 'ERROR:'.$this->error.' @'.$this->pos.' near "'.$this->text.'"';
}
}
?>
T1KUS90T