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559 lines
22 KiB
559 lines
22 KiB
<?php /* <!-- xht.lib.php -->
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<!-- XML HTML Templates, 2006/12/14 -->
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<!-- Copyright (C) 2006 rene.haentjens@UGent.be - see note at end of text -->
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<!-- Released under the GNU GPL V2, see http://www.gnu.org/licenses/gpl.html -->
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*/
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/**
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==============================================================================
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* This is an XML HTML template library.
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* Include/require it in your code to use its functionality.
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*
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* This library defines function xht_htmlwchars & class xhtdoc with methods:
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* - xht_fill_template($template_name)
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* - xht_substitute($subtext)
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*
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* Check htt_error after defining a new xhtdoc(htt_file_contents).
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*
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* Assign xht_xmldoc (, xht_get_lang, xht_resource, xht_dbgn)
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* before calling the class methods.
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*
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* @package dokeos.library
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==============================================================================
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*/
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function xht_htmlwchars($s) // use only where ISO-8859-1 is not required!
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{
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//return ereg_replace('\[((/?(b|big|i|small|sub|sup|u))|br/)\]', '<\\1>',
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// str_replace('@§@', '&',
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// htmlspecialchars(ereg_replace('&#([0-9]+);', '@§@#\\1;', $s))));
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global $charset;
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return api_ereg_replace('\[((/?(b|big|i|small|sub|sup|u))|br/)\]', '<\\1>',
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str_replace('@§@', '&',
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htmlspecialchars(api_ereg_replace('&#([0-9]+);', '@§@#\\1;', $s), ENT_QUOTES, $charset)));
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// replaces htmlspecialchars for double-escaped xml chars like '&#nnn;'
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// and when html tags <...> are represented as [...]
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}
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function xht_is_assoclist($s) // ":key1:value1,, key2:value2,, ..."
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{
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return is_string($s) && strpos($s, ',,');
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}
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function xht_explode_assoclist($s)
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{
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$result = array(); if (!xht_is_assoclist($s)) return $result;
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foreach (explode(',,', api_substr($s, 1)) as $keyplusvalue)
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if ($cp = api_strpos($keyplusvalue, api_substr($s, 0, 1)))
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$result[trim(api_substr($keyplusvalue, 0, $cp))] =
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api_substr($keyplusvalue, $cp+1);
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return $result;
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}
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class xhtdoc
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{
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var $htt_array; // array with HTML templates
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var $htt_error; // error while parsing htt_file_contents to templates
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var $xht_xmldoc; // XML Mini-DOM document for which templates are processed
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var $xht_param; // parameter array for template processing
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var $xht_get_lang; // user-supplied function for {-L xx-}, e.g. Dokeos get_lang
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var $xht_resource; // user-supplied function for '=/' in path
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var $xht_dbgn; // set to a positive value for debugging output
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var $xht_dbgo; // debugging output accumulates here
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var $_prev_param; // old parameter values
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function xht_fill_template($template_name, $cur_elem = 0)
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{
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$template_name = trim($template_name);
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if (!$template_name || (api_strpos($template_name, ' ') !== FALSE)) return '';
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if (!is_string($httext = $this->htt_array[$template_name])) return '';
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if ($this->xht_dbgn) $this->xht_dbgo .= '<!-- ' . XHT_LP . $template_name .
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' ' . XHT_RP . $this->_show_param() . " -->\n";
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$prev_lpp = 0; $prev_sub = ''; $scanpos = 0;
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while (($rpp = api_strpos($httext, XHT_RP, $scanpos)) !== FALSE) // first -}
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{
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if (($lpp = api_strpos($httext, XHT_LP)) === FALSE) break; // no {- for -}
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if ($lpp > $rpp) break; // no {- preceding -}
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while (($next_lpp = api_strpos($httext, XHT_LP, $lpp + XHT_PL)) !== FALSE)
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if ($next_lpp > $rpp) break;
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else $lpp = $next_lpp; // find {- closest to -}
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$subtext = api_substr($httext, $lpp + XHT_PL, $rpp - $lpp - XHT_PL);
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$httext = api_substr($httext, 0, $lpp) .
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$this->xht_substitute($subtext, $cur_elem, XHT_LP, XHT_RP) .
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api_substr($httext, $rpp + XHT_PL); // substitute or leave intact
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if ($lpp == $prev_lpp && $subtext == $prev_sub) // prevent looping
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{
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$scanpos = $rpp + 1; $prev_lpp = 0; $prev_sub = '';
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}
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else
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{
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$prev_lpp = $lpp; $prev_sub = $subtext;
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}
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}
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return $httext;
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}
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function xht_substitute($subtext, $cur_elem = 0, $pre = '', $post = '')
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{
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global $charset;
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$regs = array(); // for use with ereg()
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if (!api_ereg(XHT_SUBS2, $subtext, $regs) && !api_ereg(XHT_SUBS1, $subtext, $regs))
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return $pre . $subtext . $post;
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$type = $regs[1]; $text = $regs[2]; $result = ''; $subnum = FALSE;
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$subtext = isset($regs[3]) ? $regs[3] : '';
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if ($this->xht_dbgn) // generate debugging output, with new number $subnum
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{
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$subnum = ++ $this->xht_dbgn;
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$this->xht_dbgo .= '<!-- ' . XHT_LP . $type . $subnum . '+ ' .
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htmlspecialchars($text, ENT_QUOTES, $charset) . ' ' . XHT_RP .
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$this->_show_param() . " -->\n";
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}
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if ($type == 'D') // Define, e.g. {-D key value-}
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{
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// Assign the value to parameter [key]
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$this->xht_param[$text] = $subtext;
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// used to be: = $this->xht_substitute($subtext, $cur_elem);
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}
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elseif ($type == 'E') // Escape, e.g. {-E userFunction subtext-}
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{
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$result = call_user_func($text, FALSE); // get cached result, if any
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if ($result === FALSE) // no cached result available
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{
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$result = $this->xht_substitute($subtext, $cur_elem);
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$result = call_user_func($text, $result); // allow to cache
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}
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}
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elseif ($type == 'R') // Repeat, e.g. {-R general/title/string subtext-}
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{
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$rdepthn = 'rdepth' . (++ $this->xht_param['rdepth']);
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$n = 0; $this->xht_param['number'] = '0';
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if (is_array($a = $this->_lang($text, $cur_elem))) // repeat on array
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{
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foreach ($a as $key => $value)
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{
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$this->xht_param['number'] = (string) (++ $n);
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$this->xht_param[$rdepthn] = (string) ($n);
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$this->xht_param['key'] = $key;
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$this->xht_param['value'] = $value;
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$result .= $this->xht_substitute($subtext, $cur_elem);
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}
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}
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elseif (xht_is_assoclist($a)) // repeat on associative list
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{
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foreach (xht_explode_assoclist($a) as $key => $value)
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{
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$this->xht_param['number'] = (string) (++ $n);
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$this->xht_param[$rdepthn] = (string) ($n);
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$this->xht_param['key'] = $key;
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$this->xht_param['value'] = $value;
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$result .= $this->xht_substitute($subtext, $cur_elem);
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}
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}
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elseif (!is_object($this->xht_xmldoc))
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{
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$result = '? R Error: no XML doc has been assigned to xht_xmldoc';
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}
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else // repeat on XML elements
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{
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$sub_elems =
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$this->xht_xmldoc->xmd_select_elements($text, $cur_elem);
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foreach ($sub_elems as $subElem)
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{
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$this->xht_param['number'] = (string) (++ $n);
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$this->xht_param[$rdepthn] = (string) ($n);
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$result .= $this->xht_substitute($subtext, $subElem);
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}
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}
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// removed 2004/10/05: template_array (security)
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// added 2005/03/08: associative list (lang arrays deprecated)
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$this->xht_param['rdepth'] --;
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// As there is only one ['number'] or one set ['key'] + ['value'],
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// using them in nested repeats may not have the desired result.
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}
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elseif ($type == 'T') // Test, e.g. {-T key1 == key2 text-}
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{
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if (api_ereg('^(=|==|<=|<|!=|<>|>|>=) +([^ ]+) +(.*)$', $subtext, $regs))
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{
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// Comparand= parameter value if set, else languagevar value
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$cmp1 = isset($this->xht_param[$text]) ?
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$this->xht_param[$text] : $this->_lang($text, $cur_elem);
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$cmp3 = isset($this->xht_param[$cmp3 = $regs[2]]) ?
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$this->xht_param[$cmp3] : $this->_lang($cmp3, $cur_elem);
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$cmp = strcmp($cmp1, $cmp3); $op = ' ' . $regs[1] . ' ';
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if ($subnum) $this->xht_dbgo .= '<!-- ' . XHT_LP . $type . $subnum .
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' ' . htmlspecialchars($cmp1.$op.$cmp3.' = '.$cmp, ENT_QUOTES, $charset) .
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' ' . XHT_RP . " -->\n"; // debugging output
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if ( ($cmp < 0 && api_strpos(' <= < != <> ', $op)) ||
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($cmp == 0 && api_strpos(' = == <= >= ', $op)) ||
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($cmp > 0 && api_strpos(' != <> > >= ', $op)) )
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$result = $this->xht_substitute($regs[3], $cur_elem);
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// else $result is empty
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}
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else
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{
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$result = $pre . $subtext . $post;
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}
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}
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else
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{
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if (api_strpos('CLPVX', $type) !== FALSE) // used to be always
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$text = $this->xht_substitute($text, $cur_elem); // nested escape
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if ($type == 'C') // Call, e.g. {-C SUBTEMPLATE-}
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$result = $this->xht_fill_template($text, $cur_elem);
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elseif ($type == 'H') $result = htmlspecialchars($text, ENT_QUOTES, $charset);
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elseif ($type == 'L') $result = $this->_lang($text, $cur_elem);
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elseif ($type == 'P') $result = $this->xht_param[$text];
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elseif ($type == 'U') $result = urlencode($text);
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elseif ($type == 'W') $result = xht_htmlwchars($text);
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elseif (!is_object($this->xht_xmldoc))
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{
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$result = '? V/X Error: no XML doc has been assigned to xht_xmldoc';
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}
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else // $type == 'V' or 'X'
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{
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if (api_ereg('^(.*)=/(.+)$', $text, $regs)) // special resource-marker
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{
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$path = $regs[1]; $text = $regs[2];
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if (api_substr($path, -1) == '/') $path = api_substr($path, 0, -1);
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if ($path) $cur_elem = $this->xht_xmldoc->
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xmd_select_single_element($path, $cur_elem);
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$cur_elem = call_user_func($this->xht_resource, $cur_elem);
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}
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$result = ($type == 'V') ?
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$this->xht_xmldoc->xmd_value($text, $cur_elem) :
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$this->xht_xmldoc->
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xmd_html_value($text, $cur_elem, 'xht_htmlwchars');
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}
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}
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if ($subnum) $this->xht_dbgo .= '<!-- ' . XHT_LP . $type . $subnum . '- ' .
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htmlspecialchars((api_strlen($result) <= 60) ?
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$result . ' ': api_substr($result, 0, 57).'...', ENT_QUOTES, $charset) . XHT_RP . " -->\n";
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return $result;
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}
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function xht_add_template($template_name, $httext)
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{
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$this->htt_array[$template_name] = $httext;
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// removed 2004/10/05: (substr($httext, 0, 6) == 'array(') ?
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// removed 2004/10/05: @eval('return ' . $httext . ';') : $httext;
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if (!$this->htt_array[$template_name])
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{
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$this->htt_error = 'template ' . $template_name .
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' is empty or invalid'; return;
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}
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}
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function xhtdoc($htt_file_contents)
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{
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$htt_file_contents = // normalize \r (Mac) and \r\n (Windows) to \n
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str_replace("\r", "\n", str_replace("\r\n", "\n", $htt_file_contents));
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while (api_substr($htt_file_contents, -1) == "\n")
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$htt_file_contents = api_substr($htt_file_contents, 0, -1);
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$last_line = api_strrchr($htt_file_contents, "\n"); $this->htt_error = '';
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if (api_strlen($last_line) < 12 || api_substr($last_line, 0, 6) != "\n<!-- "
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|| api_strlen($last_line) % 2 != 0 || api_substr($last_line, -4) != " -->")
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{
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$this->htt_error = 'last line must be of the form <!-- {--} -->';
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return;
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}
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define('XHT_PL', (int) (api_strlen($last_line) - 10) / 2); // Parentheses Lth
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define('XHT_LP', api_substr($last_line, 6, XHT_PL)); // Left Par
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define('XHT_RP', api_substr($last_line, 6 + XHT_PL, XHT_PL)); // Right Par
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if (XHT_LP == XHT_RP)
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{
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$this->htt_error =
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'parentheses in last line <!-- {--} --> must not be identical';
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return;
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}
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$this->htt_array = array(); // named elements are arrays and strings
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foreach (explode("\n<!-- " . XHT_LP, "\n" . $htt_file_contents)
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as $name_and_text)
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{
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if (($name_length = api_strpos($name_and_text, XHT_RP . " -->\n")))
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{
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$template_name = trim(api_substr($name_and_text, 0, $name_length));
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if (api_strpos($template_name, ' ') !== FALSE) give_up('Template ' .
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$template_name . ' has a space in its name');
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$httext = api_substr($name_and_text, $name_length + XHT_PL + 5);
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while (api_substr($httext, 0, 1) == "\n") $httext = api_substr($httext, 1);
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while (api_substr($httext, -1) == "\n") $httext = api_substr($httext,0,-1);
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$this->xht_add_template($template_name, $httext);
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}
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}
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define('XHT_SUBS1', '^(C|H|L|P|U|V|W|X) +(.*)$'); // substitution types 1:
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// Call, Htmlchars, Lang, Param, Urlencode, Value, Wchars, Xvalue
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define('XHT_SUBS2', '^(D|E|R|T) +([^ ]+) +(.*)$'); // substitution types 2:
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// Define, Escape, Repeat, Test
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$this->xht_dbgo = '';
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$this->xht_param = array(0 => '0', 1 => '1',
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'' => '', 'empty' => '', 'rdepth' => 0);
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$this->_prev_param = $this->xht_param;
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// empty: {-R * P empty-} puts the number of subelements in {-P number-}
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// rdepth: current number of nested R's
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// rdepth1, rdepth2, ...: key or number, see R
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}
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function _show_param() // for debugging info
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{
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global $charset;
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$result = '';
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foreach ($this->xht_param as $k => $v)
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if ($v !== $this->_prev_param[$k])
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{
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$this->_prev_param[$k] = $v; $result .= ', ' . $k . ': ' .
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((api_strlen($v) <= 20) ? $v : api_substr($v, 0, 17).'...');
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}
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return $result ? htmlspecialchars(api_substr($result, 1), ENT_QUOTES, $charset) : '';
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}
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function _lang($var, $cur_elem = 0)
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{
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$result = @call_user_func($this->xht_get_lang, $var, $cur_elem);
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// This is a hack for proper working of the language selectors
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// in the forms that are generated through templates.
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if ($var == 'Langs')
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{
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global $langLangs;
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if (isset($langLangs))
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{
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$result = $langLangs;
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}
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}
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return isset($result) ? $result : $var;
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}
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}
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/*
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A word of explanation...
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The last line of a template file (example below) defines the special markers
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that are used around template names such as INPUT and OPTION and around HTML
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escapes such as 'P value' and 'L Store', { and } in the example. You can also
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use markers of more than one character as long as both have the same length,
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e.g. <% and %>. The markers must not be equal. In templates with JavaScript
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or <style>, the use of { and } might be confusing; however, it does work.
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A template starts with a special comment line giving the name of the template
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and ends where the next template starts.
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Templates contain escapes of the form {one-letter the-rest}, e.g.
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{L IdentifierTip}, where the-rest can contain a nested-escape as in e.g.
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{R metadata/lom/general/keyword C KEYWORDTEMPLATE}.
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Multiple spaces count as one in many places, but not in all. Best is to use
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correct spacing. In particular, a T escape such as the example below requires
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a space at the end of the first line:
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{T x == y
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text
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}
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Names (of templates, parameters, langvars and user-functions)
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are case sensitive and cannot contain spaces.
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Templates are called with a certain currency in the XML doc, usually the root
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element; for an xml-path repeat, the found element is the current one.
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One single array with named elements and string values contains the
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template parameters; they are shared for all template processing.
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Initially, params contains
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0 => '0', 1 => '1', '' => '', 'empty' => '', 'rdepth' => 0.
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rdepth keeps track of the current number of nested repeats. In a repeat,
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params number, key, value and rdepthN (N is 1, 2, ...) get assigned values.
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Types of escapes:
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C template-name/nested-escape Call a sub-template
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D parameter-name text Define a parameter value
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E user-function nested-escape Escape to user-function or do nested-escape
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H text HtmlSpecialChars (e.g. transform < to <)
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L languagevar/nested-escape Language variable value (see also below)
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P parameter-name/nested-escape Parameter value
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R repeat-part nested-escape Repeat nested-escape for each ... (see below)
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T key1 operator key2 nested-esc Test, do nested-esc if test succeeds (id.)
|
|
U text UrlEncode (e.g. transform < to %XX)
|
|
V xml-path/nested-escape Value from XML document element or attribute
|
|
W text xht_htmlwchars (see below)
|
|
X extended-xml-path/nested-esc eXtended Value from XML (see below)
|
|
|
|
nested-escape= without the special markers. Nesting with special markers is
|
|
always possible and in that case the inner nesting is evaluated first.
|
|
Note that as from the 2005/03/15 version, some implicit nestings are no
|
|
longer possible, e.g. {H {P key}} and {D label {L Keyword}} now require
|
|
the inner markers.
|
|
|
|
Escape allows the caller to cache template output:
|
|
user-function is called with parameter (FALSE);
|
|
if it returns a string, that string is the result;
|
|
if it returns FALSE, nested-escape is executed to produce a result
|
|
and user-function is called again with the result, allowing it
|
|
to cache the result somewhere; user-function then returns the real result.
|
|
|
|
repeat-part can be:
|
|
the name of a languagevar which contains an associative list such as:
|
|
":key1:value1,, key2:value2,, key3:value3" (note double ,,):
|
|
nested-escape is repeated for each list element,
|
|
params 'key' and 'value' refer to the current element;
|
|
first character defines key-value-separator (here a colon);
|
|
key cannot contain key-value-separators and is trimmed;
|
|
value can contain anything except ,, and it is not trimmed;
|
|
put ',,' at the end of a 0- or 1-element-list.
|
|
the name of a languagevar which has an array value:
|
|
nested-escape is repeated for each array element,
|
|
params 'key' and 'value' refer to the current element.
|
|
an xml-path to 0, 1 or more elements in the XML document:
|
|
nested-escape is repeated for each element, param 'number' = 1, 2, ...
|
|
|
|
test operators compare strings: = == <= < != <> > >=
|
|
key1 and key2 can be parameter-name or languagevar-name.
|
|
|
|
xml-path: see XML Mini-DOM; examples:
|
|
organizations/@default, body/p[1] (1=first), keyword/*, node/*[-3]
|
|
/ * /... starts from XML document root, regardless of context
|
|
other extensions: .. - + @* @. (parent, prev, next, number, name)
|
|
.. stops at the root if too many
|
|
-name, +name and @*name means only elements of that name
|
|
|
|
xht_htmlwchars is like HtmlSpecialChars, but moreover translates:
|
|
[b] to <b>, likewise for big, i, small, sub, sup, u, br, and closing tags;
|
|
&#nnn; to &#nnn; (double-escape for non-UTF8-channels)
|
|
|
|
eXtended Value: see method xmd_html_value of the XML Mini-DOM;
|
|
the values (but not the pre-, in- and suffixes) are always W-processed;
|
|
extended-xml-path examples:
|
|
'keyword/string ,' generates e.g. 'kwd1,kwd2,kwd3'
|
|
'keyword/string , ' generates e.g. 'kwd1, kwd2, kwd3'
|
|
'( -% keyword/string , %- )' generates e.g. '(kwd1,kwd2,kwd3)'
|
|
but will generate nothing if no keywords are found in the XML doc;
|
|
note that the special markers ' -% ' and ' %- ' must have the spaces.
|
|
|
|
V and X escapes can have an xml-path containing '=/': this calls a user-supplied
|
|
function for finding an associated element. It can e.g. be used when reading
|
|
a SCORM manifest, for finding the <resource> of an <item>.
|
|
|
|
L also calls a user-supplied function. Its main target is language-dependent
|
|
texts, e.g. Dokeos 'get_lang'. But the current element is passed as second
|
|
argument, allowing other functionality in the callback.
|
|
|
|
Array templates functionality has been removed on 2004/10/05, because of a
|
|
security issue when users can submit templates.
|
|
|
|
--------------------------------------------------------------------------------
|
|
|
|
Example template file:
|
|
|
|
<!-- {HEAD} -->
|
|
<style type="text/css">
|
|
body {font-family: Arial}
|
|
</style>
|
|
|
|
<!-- {METADATA} -->
|
|
<h3>{H {L Tool}: {P entry}}</h3>
|
|
<table>
|
|
<tr>
|
|
<td>{D label {L Language}}{D tip {L LanguageTip}}{C LABEL}</td>
|
|
<td><select>{D thislang {V general/language}}{R Langs C OPTION}</select></td>
|
|
<td><input type="text" disabled value="urn:ugent-be:minerva."/></td>
|
|
</tr>
|
|
{R general/keyword C KEYWORD}
|
|
</table>
|
|
|
|
<!---------------------- E-n-d Of script Output ---------------------->
|
|
|
|
<!-- {LABEL} -->
|
|
<span title="{H {P tip}}">{H {P label}} :</span>
|
|
<!-- {OPTION} -->
|
|
<option value="{H {P key}}" {T key == thislang selected}>{H {P value}}</option>
|
|
<!-- {INPUT} -->
|
|
<input type="text" title="{P title}" class="wide" value="{H {P value}}"/>
|
|
<!-- {KEYWORD} -->
|
|
<tr>
|
|
<td>{D label {L Keyword}}{D tip {L KeywordTip}}{C LABEL}</td>
|
|
<td nowrap><select>{D thislang {V string/@language}}{R Langs C OPTION}</select></td>
|
|
<td>{D value {X string}}{D title general/keyword[{P number}]/string}{C INPUT}</td>
|
|
</tr>
|
|
<!-- {} -->
|
|
|
|
--------------------------------------------------------------------------------
|
|
|
|
<!--
|
|
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.
|
|
|
|
-->
|
|
*/
|
|
|
|
?>
|
|
|