nparser.php
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Created: Sat, Feb 1, 8:47 AM

nparser.php
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	<?php
	/**
	* @version $Id: nparser.php 12970 2009-12-22 11:02:37Z alex $
	* @package In-Portal
	* @copyright Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
	* @license GNU/GPL
	* In-Portal is Open Source software.
	* This means that this software may have been modified pursuant
	* the GNU General Public License, and as distributed it includes
	* or is derivative of works licensed under the GNU General Public License
	* or other free or open source software licenses.
	* See http://www.in-portal.org/license for copyright notices and details.
	*/

	defined('FULL_PATH') or die('restricted access!');

	include_once(KERNEL_PATH.'/nparser/ntags.php');

	define('TAG_NAMESPACE', 'inp2:');
	define('TAG_NAMESPACE_LENGTH', 5);

	class NParser extends kBase {

	var $Stack = array();
	var $Level = 0;

	var $Buffers = array();
	var $InsideComment = false;

	/**
	* Parse tags inside HTML comments
	*
	* @var bool
	*/
	var $SkipComments = true;

	var $Params = array();
	var $ParamsStack = array();
	var $ParamsLevel = 0;

	var $Definitions = '';

	var $Elements = array(); // holds dynamic elements to function names mapping during execution

	/**
	* Holds location of element definitions inside templates.
	* key - element function name, value - array of 2 keys: {from_pos, to_pos}
	*
	* @var Array
	*/
	var $ElementLocations = Array ();

	var $DataExists = false;

	var $TemplateName = null;
	var $TempalteFullPath = null;

	var $CachePointers = array();
	var $Cachable = array();

	/**
	* Parser parameter names, that are created via m_Capture tag are listed here
	*
	* @var Array
	*/
	var $Captures = array();

	/**
	* Phrases, used on "Edit" buttons, that parser adds during block decoration
	*
	* @var Array
	*/
	var $_btnPhrases = Array ();

	function NParser()
	{
	parent::kBase();

	if (defined('EDITING_MODE') && (EDITING_MODE == EDITING_MODE_DESIGN)) {
	$this->_btnPhrases['design'] = $this->Application->Phrase('la_btn_EditDesign', false, true);
	$this->_btnPhrases['block'] = $this->Application->Phrase('la_btn_EditBlock', false, true);
	}
	}

	function Compile($pre_parsed, $template_name = 'unknown')
	{
	$data = file_get_contents($pre_parsed['tname']);

	if (!$this->CompileRaw($data, $pre_parsed['tname'], $template_name)) {
	// compilation failed during errors in template
	// trigger_error('Template "<strong>' . $template_name . '</strong>" not compiled because of errors', E_USER_WARNING);
	return false;
	}

	// saving compiled version (only when compilation was successful)
	$this->Application->TemplatesCache->saveTemplate($pre_parsed['fname'], $this->Buffers[0]);

	return true;
	}

	function Parse($raw_template, $name = null)
	{
	$this->CompileRaw($raw_template, $name);
	ob_start();
	$_parser =& $this;
	eval('?'.'>'.$this->Buffers[0]);

	return ob_get_clean();
	}

	function CompileRaw($data, $t_name, $template_name = 'unknown')
	{
	$code = "extract (\$_parser->Params);\n";
	$code .= "\$_parser->ElementLocations['{$template_name}'] = Array('template' => '{$template_name}', 'start_pos' => 0, 'end_pos' => " . strlen($data) . ");\n";

	// $code .= "__@@__DefinitionsMarker__@@__\n";

	// $code .= "if (!\$this->CacheStart('".abs(crc32($t_name))."_0')) {\n";
	$this->Buffers[0] = '<?'."php $code ?>\n";
	$this->Cacheable[0] = true;
	$this->Definitions = '';

	// finding all the tags
	$reg = '(.?)(<[\\/]?)' . TAG_NAMESPACE . '([^>]?)([\\/]?>)(\r\n){0,1}';
	preg_match_all('/'.$reg.'/s', $data, $results, PREG_SET_ORDER + PREG_OFFSET_CAPTURE);

	$this->InsideComment = false;
	foreach ($results as $tag_data) {
	$tag = array(
	'opening' => $tag_data[2][0],
	'tag' => $tag_data[3][0],
	'closing' => $tag_data[4][0],
	'line' => substr_count(substr($data, 0, $tag_data[2][1]), "\n")+1,
	'pos' => $tag_data[2][1],
	'file' => $t_name,
	'template' => $template_name,
	);

	// the idea is to count number of comment openings and closings before current tag
	// if the numbers do not match we inverse the status of InsideComment
	if ($this->SkipComments && (substr_count($tag_data[1][0], '<!--') != substr_count($tag_data[1][0], '-->'))) {
	$this->InsideComment = !$this->InsideComment;
	}

	// appending any text/html data found before tag
	$this->Buffers[$this->Level] .= $tag_data[1][0];
	if (!$this->InsideComment) {
	$tmp_tag = $this->Application->CurrentNTag;
	$this->Application->CurrentNTag = $tag;
	if ($this->ProcessTag($tag) === false) {
	$this->Application->CurrentNTag = $tmp_tag;
	return false;
	}
	$this->Application->CurrentNTag = $tmp_tag;
	}
	else {
	$this->Buffers[$this->Level] .= $tag_data[2][0].$tag_data[3][0].$tag_data[4][0];
	}
	}

	if ($this->Level > 0) {
	$this->Application->handleError(E_USER_ERROR, 'Unclosed tag opened by '.$this->TagInfo($this->Stack[$this->Level]->Tag), $this->Stack[$this->Level]->Tag['file'], $this->Stack[$this->Level]->Tag['line']);
	return false;
	}

	// appending text data after last tag (after its closing pos),
	// if no tag was found at all ($tag_data is not set) - append the whole $data
	$this->Buffers[$this->Level] .= isset($tag_data) ? substr($data, $tag_data[4][1]+strlen($tag_data[4][0])) : $data;
	$this->Buffers[$this->Level] = preg_replace('/<!--##(.*?)##-->/s', '', $this->Buffers[$this->Level]); // remove hidden comments IB#23065
	// $this->Buffers[$this->Level] .= '<?'.'php '."\n\$_parser->CacheEnd();\n}\n"." ?".">\n";
	// $this->Buffers[$this->Level] = str_replace('__@@__DefinitionsMarker__@@__', $this->Definitions, $this->Buffers[$this->Level]);

	return true;
	}

	function SplitParamsStr($params_str)
	{
	preg_match_all('/([\${}a-zA-Z0-9_.\\-\\\\#\\[\\]]+)=(["\']{1,1})(.*?)(?<!\\\)\\2/s', $params_str, $rets, PREG_SET_ORDER);

	$values = Array();

	// we need to replace all occurences of any current param $key with {$key} for correct variable substitution
	foreach ($rets AS $key => $val){
	$values[$val[1]] = str_replace('\\' . $val[2], $val[2], $val[3]);
	}

	return $values;
	}

	function SplitTag($tag)
	{
	if (!preg_match('/([^_ \t\r\n])[_]?([^ \t\r\n])[ \t\r\n](.)$$/s', $tag['tag'], $parts)) {
	// this is virtually impossible, but just in case
	$this->Application->handleError(E_USER_ERROR, 'Incorrect tag format: '.$tag['tag'], $tag['file'], $tag['line']);
	return false;
	}

	$splited['prefix'] = $parts[2] ? $parts[1] : '__auto__';
	$splited['name'] = $parts[2] ? $parts[2] : $parts[1];
	$splited['attrs'] = $parts[3];

	return $splited;
	}

	function ProcessTag($tag)
	{
	$splited = $this->SplitTag($tag);
	if ($splited === false) {
	return false;
	}

	$tag = array_merge($tag, $splited);
	$tag['processed'] = false;
	$tag['NP'] = $this->SplitParamsStr($tag['attrs']);

	$o = '';
	$tag['is_closing'] = $tag['opening'] == '</' \|\| $tag['closing'] == '/>';
	if (class_exists('_Tag_'.$tag['name'])) { // block tags should have special handling class
	if ($tag['opening'] == '<') {
	$class = '_Tag_'.$tag['name'];
	$instance = new $class($tag);
	$instance->Parser =& $this;
	/* @var $instance _BlockTag */
	$this->Stack[++$this->Level] =& $instance;
	$this->Buffers[$this->Level] = '';
	$this->Cachable[$this->Level] = true;
	$open_code = $instance->Open($tag);
	if ($open_code === false) {
	return false;
	}
	$o .= $open_code;
	}

	if ($tag['is_closing']) { // not ELSE here, because tag may be <empty/> and still has a handler-class
	if ($this->Level == 0) {
	$dump = array();
	foreach ($this->Stack as $instance) {
	$dump[] = $instance->Tag;
	}
	print_pre($dump);
	$this->Application->handleError(E_USER_ERROR, 'Closing tag without an opening: '.$this->TagInfo($tag).' <b> - probably opening tag was removed or nested tags error</b>', $tag['file'], $tag['line']);
	return false;
	}
	if ($this->Stack[$this->Level]->Tag['name'] != $tag['name']) {
	$opening_tag = $this->Stack[$this->Level]->Tag;
	$this->Application->handleError(E_USER_ERROR,
	'Closing tag '.$this->TagInfo($tag).' does not match
	opening tag at current nesting level ('.$this->TagInfo($opening_tag).'
	opened at line '.$opening_tag['line'].')', $tag['file'], $tag['line']);
	return false;
	}

	$o .= $this->Stack[$this->Level]->Close($tag); // DO NOT use $this->Level-- here because it's used inside Close
	$this->Level--;
	}
	}
	else { // regular tags - just compile
	if (!$tag['is_closing']) {
	$this->Application->handleError(E_USER_ERROR, 'Tag without a handler: '.$this->TagInfo($tag).' <b> - probably missing <empty <span style="color: red">/</span>> tag closing</b>', $tag['file'], $tag['line']);
	return false;
	}

	if ($this->Level > 0) $o .= $this->Stack[$this->Level]->PassThrough($tag);
	if (!$tag['processed']) {
	$compiled = $this->CompileTag($tag);
	if ($compiled === false) return false;
	if (isset($tag['NP']['cachable']) && (!$tag['NP']['cachable'] \|\| $tag['NP']['cachable'] == 'false')) {
	$this->Cachable[$this->Level] = false;
	}
	$o .= '<?'.'php ' . $compiled . " ?>\n";
	// $o .= '<?'.'php ';
	// $o .= (isset($tag['NP']['cachable']) && (!$tag['NP']['cachable'] \|\| $tag['NP']['cachable'] == 'false')) ? $this->BreakCache($compiled, $this->GetPointer($tag)) : $compiled;
	// $o .= " ?".">\n";
	}
	}
	$this->Buffers[$this->Level] .= $o;
	return true;
	}

	function GetPointer($tag)
	{
	return abs(crc32($tag['file'])).'_'.$tag['line'];
	}

	function BreakCache($code, $pointer, $condition='')
	{
	return "\$_parser->CacheEnd();\n}\n" . $code."\nif ( !\$_parser->CacheStart('{$pointer}'" . ($condition ? ", {$condition}" : '') . ") ) {\n";
	}

	function TagInfo($tag, $with_params=false)
	{
	return "<b>{$tag['prefix']}_{$tag['name']}".($with_params ? ' '.$tag['attrs'] : '')."</b>";
	}

	function CompileParamsArray($arr)
	{
	$to_pass = 'Array(';
	foreach ($arr as $name => $val) {
	$to_pass .= '"'.$name.'" => "'.str_replace('"', '\"', $val).'",';
	}
	$to_pass .= ')';
	return $to_pass;
	}

	function CompileTag($tag)
	{
	$code = '';
	$to_pass = $this->CompileParamsArray($tag['NP']);

	if ($tag['prefix'] == '__auto__') {
	$prefix = $this->GetParam('PrefixSpecial');
	$code .= '$_p_ =& $_parser->GetProcessor($PrefixSpecial);'."\n";
	$code .= 'echo $_p_->ProcessParsedTag(\''.$tag['name'].'\', '.$to_pass.', "$PrefixSpecial", \''.$tag['file'].'\', '.$tag['line'].');'."\n";
	}
	else {
	$prefix = $tag['prefix'];
	$code .= '$_p_ =& $_parser->GetProcessor("'.$tag['prefix'].'");'."\n";
	$code .= 'echo $_p_->ProcessParsedTag(\''.$tag['name'].'\', '.$to_pass.', "'.$tag['prefix'].'", \''.$tag['file'].'\', '.$tag['line'].');'."\n";
	}

	if (array_key_exists('result_to_var', $tag['NP']) && $tag['NP']['result_to_var']) {
	$code .= "\$params['{$tag['NP']['result_to_var']}'] = \$_parser->GetParam('{$tag['NP']['result_to_var']}');\n";
	$code .= "\${$tag['NP']['result_to_var']} = \$params['{$tag['NP']['result_to_var']}'];\n";
	}

	if ($prefix && strpos($prefix, '$') === false) {
	$p =& $this->GetProcessor($prefix);
	if (!is_object($p) \|\| !$p->CheckTag($tag['name'], $tag['prefix'])) {
	$this->Application->handleError(E_USER_ERROR, 'Unknown tag: '.$this->TagInfo($tag).' <b> - incorrect tag name or prefix </b>', $tag['file'], $tag['line']);
	return false;
	}
	}

	return $code;
	}

	function CheckTemplate($t, $silent = null)
	{
	$pre_parsed = $this->Application->TemplatesCache->GetPreParsed($t);
	if (!$pre_parsed) {
	if (!$silent) {
	if ($this->Application->isDebugMode()) {
	$this->Application->Debugger->appendTrace();
	}

	trigger_error('Cannot include "<strong>' . $t . '</strong>" - file does not exist', E_USER_ERROR);
	}

	return false;
	}

	$force_compile = defined('DBG_NPARSER_FORCE_COMPILE') && DBG_NPARSER_FORCE_COMPILE;
	if (!$pre_parsed \|\| !$pre_parsed['active'] \|\| $force_compile) {
	$inc_parser = new NParser();

	if ($force_compile) {
	// remove Front-End theme markings during total compilation
	$t = preg_replace('/^theme:.*?\//', '', $t);
	}

	if (!$inc_parser->Compile($pre_parsed, $t)) {
	return false;
	}
	}

	return $pre_parsed;
	}

	function Run($t, $silent = null)
	{
	if ((strpos($t, '../') !== false) \|\| (trim($t) !== $t)) {
	// when relative paths or special chars are found template names from url, then it's hacking attempt
	return false;
	}

	$pre_parsed = $this->CheckTemplate($t, $silent);
	if (!$pre_parsed) {
	return false;
	}

	$backup_template = $this->TemplateName;
	$backup_fullpath = $this->TempalteFullPath;
	$this->TemplateName = $t;
	$this->TempalteFullPath = $pre_parsed['tname'];

	$output =& $this->Application->TemplatesCache->runTemplate($this, $pre_parsed);

	$this->TemplateName = $backup_template;
	$this->TempalteFullPath = $backup_fullpath;

	return $output;
	}

	function &GetProcessor($prefix)
	{
	static $Processors = array();
	if (!isset($Processors[$prefix])) {
	$Processors[$prefix] = $this->Application->recallObject($prefix.'_TagProcessor');
	}

	return $Processors[$prefix];
	}

	function SelectParam($params, $possible_names)
	{
	if (!is_array($params)) return;
	if (!is_array($possible_names))

	$possible_names = explode(',', $possible_names);
	foreach ($possible_names as $name)
	{
	if( isset($params[$name]) ) return $params[$name];
	}
	return false;
	}

	function SetParams($params)
	{
	$this->Params = $params;
	$keys = array_keys($this->Params);
	}

	function GetParam($name)
	{
	return isset($this->Params[$name]) ? $this->Params[$name] : false;
	}

	function SetParam($name, $value)
	{
	$this->Params[$name] = $value;
	}

	function PushParams($params)
	{
	$this->ParamsStack[$this->ParamsLevel++] = $this->Params;
	$this->Params = $params;
	}

	function PopParams()
	{
	$this->Params = $this->ParamsStack[--$this->ParamsLevel];
	}

	function ParseBlock($params, $pass_params=false)
	{
	if (isset($params['cache_timeout']) && ($ret = $this->CacheGet($this->FormCacheKey('element_'.$params['name'])))) {
	return $ret;
	}

	if (substr($params['name'], 0, 5) == 'html:') {
	return substr($params['name'], 6);
	}

	if (!array_key_exists($params['name'], $this->Elements) && array_key_exists('default_element', $params)) {
	// when given element not found, but default element name given, then render it instead
	$params['name'] = $params['default_element'];
	unset($params['default_element']);
	return $this->ParseBlock($params, $pass_params);
	}

	$original_params = $params;

	if ($pass_params \|\| isset($params['pass_params'])) $params = array_merge($this->Params, $params);
	$this->PushParams($params);
	$data_exists_bak = $this->DataExists;

	// if we are parsing design block and we have block_no_data - we need to wrap block_no_data into design,
	// so we should set DataExists to true manually, otherwise the design block will be skipped because of data_exists in params (by Kostja)
	//
	// keep_data_exists is used by block RenderElement (always added in ntags.php), to keep the DataExists value
	// from inside-content block, otherwise when parsing the design block DataExists will be reset to false resulting missing design block (by Kostja)
	//
	// Inside-content block parsing result is given to design block in "content" parameter (ntags.php) and "keep_data_exists"
	// is only passed, when parsing design block. In case, when $this->DataExists is set to true, but
	// zero-length content (in 2 cases: method NParser::CheckNoData set it OR really empty block content)
	// is returned from inside-content block, then design block also should not be shown (by Alex)
	$this->DataExists = (isset($params['keep_data_exists']) && isset($params['content']) && $params['content'] != '' && $this->DataExists) \|\| (isset($params['design']) && isset($params['block_no_data']) && $params['name'] == $params['design']);

	if (!array_key_exists($params['name'], $this->Elements)) {
	$pre_parsed = $this->Application->TemplatesCache->GetPreParsed($params['name']);
	if ($pre_parsed) {
	$ret = $this->IncludeTemplate($params);

	if (array_key_exists('no_editing', $params) && $params['no_editing']) {
	// when individual render element don't want to be edited
	return $ret;
	}

	return defined('EDITING_MODE') ? $this->DecorateBlock($ret, $params, true) : $ret;
	}

	if ($this->Application->isDebugMode()) {
	$this->Application->Debugger->appendTrace();
	}
	$trace_results = debug_backtrace();
	$this->Application->handleError(E_USER_ERROR, '<b>Rendering of undefined element '.$params['name'].'</b>', $trace_results[0]['file'], $trace_results[0]['line']);
	return false;
	}

	$m_processor =& $this->GetProcessor('m');
	$flag_values = $m_processor->PreparePostProcess($params);

	$f_name = $this->Elements[$params['name']];
	$ret = $f_name($this, $params);
	$ret = $m_processor->PostProcess($ret, $flag_values);
	$block_params = $this->Params; // input parameters, but modified inside rendered block
	$this->PopParams();

	if (array_key_exists('result_to_var', $flag_values) && $flag_values['result_to_var']) {
	// when "result_to_var" used inside ParseBlock, then $$result_to_var parameter is set inside ParseBlock,
	// but not outside it as expected and got lost at all after PopParams is called, so make it work by
	// setting it's value on current parameter deep level (from where ParseBlock was called)
	$this->SetParam($flag_values['result_to_var'], $block_params[ $flag_values['result_to_var'] ]);
	}

	$this->CheckNoData($ret, $params);

	$this->DataExists = $data_exists_bak \|\| $this->DataExists;

	if (isset($original_params['cache_timeout'])) {
	$this->CacheSet($this->FormCacheKey('element_'.$original_params['name']), $ret, $original_params['cache_timeout']);
	}

	if (array_key_exists('no_editing', $block_params) && $block_params['no_editing']) {
	// when individual render element don't want to be edited
	return $ret;
	}

	return defined('EDITING_MODE') ? $this->DecorateBlock($ret, $params) : $ret;
	}

	function DecorateBlock($block_content, $block_params, $is_template = false)
	{
	static $used_ids = Array (), $base_url = null;

	if (!isset($base_url)) {
	$base_url = $this->Application->BaseURL();
	}

	// $prepend = '[name: ' . $block_params['name'] . '] [params: ' . implode(', ', array_keys($block_params)) . ']';

	$decorate = false;
	$design = false;

	if (EDITING_MODE == EDITING_MODE_DESIGN) {
	$decorate = true;

	if ($is_template) {
	// content inside pair RenderElement tag
	}
	else {
	if (strpos($block_params['name'], '__capture_') === 0) {
	// capture tag (usually inside pair RenderElement)
	$decorate = false;
	}
	elseif (array_key_exists('content', $block_params)) {
	// pair RenderElement (on template, were it's used)
	$design = true;
	}
	}
	}

	if (!$decorate) {
	return $block_content;
	}
	else {
	$block_content = /$prepend ./ $block_content;
	}

	$block_name = $block_params['name'];
	$function_name = $is_template ? $block_name : $this->Elements[$block_name];

	$block_title = '';
	if (array_key_exists($function_name, $this->Application->Parser->ElementLocations)) {
	$element_location = $this->Application->Parser->ElementLocations[$function_name];

	$block_title .= $element_location['template'] . '.tpl';
	$block_title .= ' (' . $element_location['start_pos'] . ' - ' . $element_location['end_pos'] . ')';
	}

	// ensure unique id for every div (used from print lists)
	$container_num = 1;
	$container_id = 'parser_block[' . $function_name . ']';
	while (in_array($container_id . '_' . $container_num, $used_ids)) {
	$container_num++;
	}

	$container_id .= '_' . $container_num;
	$used_ids[] = $container_id;

	// prepare parameter string
	$param_string = $block_name . ':' . $function_name;

	if ($design) {
	$btn_text = $this->_btnPhrases['design'];
	$btn_class = 'cms-edit-design-btn';
	$btn_container_class = 'block-edit-design-btn-container';
	$btn_name = 'design';
	}
	else {
	$btn_text = $this->_btnPhrases['block'];
	$btn_class = 'cms-edit-block-btn';
	$btn_container_class = 'block-edit-block-btn-container';
	$btn_name = 'content';
	}

	$block_editor = '
	<div id="' . $container_id . '" params="' . $param_string . '" class="' . $btn_container_class . '" title="' . htmlspecialchars($block_title) . '">
	<div class="' . $btn_class . '">
	<div class="cms-btn-image">
	<img src="' . $base_url . 'core/admin_templates/img/top_frame/icons/' . $btn_name . '_mode.png" width="15" height="16" alt=""/>
	</div>
	<div class="cms-btn-text" id="' . $container_id . '_btn">' . $btn_text . '</div>
	</div>
	<div class="cms-btn-content">
	%s
	</div>
	</div>';

	// 1 - text before, 2 - open tag, 3 - open tag attributes, 4 - content inside tag, 5 - closing tag, 6 - text after closing tag
	if (preg_match('/^(\s)<(td\|span)(.?)>(.)<\/(td\|span)>(.)$/is', $block_content, $regs)) {
	// div inside span -> put div outside span
	return $regs[1] . '<' . $regs[2] . ' ' . $regs[3] . '>' . str_replace('%s', $regs[4], $block_editor) . '</' . $regs[5] . '>' . $regs[6];
	}

	return str_replace('%s', $block_content, $block_editor);
	}

	function IncludeTemplate($params, $silent=null)
	{
	$t = is_array($params) ? $this->SelectParam($params, 't,template,block,name') : $params;

	if (isset($params['cache_timeout']) && ($ret = $this->CacheGet('template:'.$t))) {
	return $ret;
	}

	$t = preg_replace('/\.tpl$/', '', $t);
	$data_exists_bak = $this->DataExists;
	$this->DataExists = false;

	if (!isset($silent) && array_key_exists('is_silent', $params)) {
	$silent = $params['is_silent'];
	}

	if (isset($params['pass_params'])) {
	// ability to pass params from block to template
	$params = array_merge($this->Params, $params);
	}

	$this->PushParams($params);
	$ret = $this->Run($t, $silent);
	$this->PopParams();

	$this->CheckNoData($ret, $params);
	$this->DataExists = $data_exists_bak \|\| $this->DataExists;

	if (isset($params['cache_timeout'])) {
	$this->CacheSet('template:'.$t, $ret, $params['cache_timeout']);
	}

	return $ret;
	}

	function CheckNoData(&$ret, $params)
	{
	if (array_key_exists('data_exists', $params) && $params['data_exists'] && !$this->DataExists) {
	$block_no_data = isset($params['BlockNoData']) ? $params['BlockNoData'] : (isset($params['block_no_data']) ? $params['block_no_data'] : false);
	if ($block_no_data) {
	$ret = $this->ParseBlock(array('name'=>$block_no_data));
	}
	else {
	$ret = '';
	}
	}
	}

	function CacheGet($name)
	{
	if (!$this->Application->ConfigValue('SystemTagCache')) return false;
	return $this->Application->CacheGet($name);
	}

	function CacheSet($name, $value, $expiration=0)
	{
	if (!$this->Application->ConfigValue('SystemTagCache')) return false;
	return $this->Application->CacheSet($name, $value, $expiration);
	}

	function FormCacheKey($element, $file=null, $add_prefixes=null)
	{
	if (!isset($file)) {
	$file = str_replace(FULL_PATH, '', $this->TempalteFullPath).':'.$this->Application->GetVar('t');
	}
	$parts = array(
	'file_'.$file.'('.filemtime($this->TempalteFullPath).')' => 'serials:file_ts', // theme + template timestamp
	'm_lang_'.$this->Application->GetVar('m_lang') => 'serials:lang_ts',
	'm_cat_id_'.$this->Application->GetVar('m_cat_id') => 'serials:cat_'.$this->Application->GetVar('m_cat_id').'_ts',
	'm_cat_page'.$this->Application->GetVar('m_cat_page') => false,
	);
	if (isset($add_prefixes)) {
	foreach ($add_prefixes as $prefix) {
	$parts[$prefix.'_id_'.$this->Application->GetVar("{$prefix}_id")] = "serials:$prefix_".$this->Application->GetVar("{$prefix}_id").'_ts';
	$parts[$prefix.'_page_'.$this->Application->GetVar("{$prefix}_Page")] = false;
	}
	}
	$key = '';
	foreach ($parts as $part => $ts_name) {
	if ($ts_name) {
	$ts = $this->Application->CacheGet($ts_name);
	$key .= "$part($ts):";
	}
	else {
	$key .= "$part:";
	}
	}
	$key .= $element;

	return crc32($key);
	}

	function PushPointer($pointer)
	{
	$this->CachePointers[++$this->CacheLevel] = $this->FormCacheKey('pointer:'.$pointer);
	return $this->CachePointers[$this->CacheLevel];
	}

	function PopPointer()
	{
	return $this->CachePointers[$this->CacheLevel--];
	}

	function CacheStart($pointer=null)
	{
	if ($ret = $this->CacheGet($this->PushPointer($pointer)) ) {
	echo $ret;
	$this->PopPointer();
	return true;
	}
	ob_start();
	return false;
	}

	function CacheEnd($elem=null)
	{
	$ret = ob_get_clean();
	$this->CacheSet($this->PopPointer(), $ret); // . ($this->CurrentKeyPart ? ':'.$this->CurrentKeyPart : '')
	echo $ret;
	}
	}

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