include/template_processor.php

   1 <?php
   2         define ("KEY_NOT_EXISTS", '^R_key_not_Exists^');
   3
   4         class Template {
   5                 var $r;
   6                 var $search;
   7                 var $replace;
   8                 var $stack = array();
   9                 var $nodes = array();
  10                 var $done = false;
  11                 var $d = false;
  12                 var $lang = null;
  13                 var $debug=false;
  14
  15                 private function _preg_error(){
  16                         switch(preg_last_error()){
  17                             case PREG_INTERNAL_ERROR: echo('PREG_INTERNAL_ERROR'); break;
  18                             case PREG_BACKTRACK_LIMIT_ERROR: echo('PREG_BACKTRACK_LIMIT_ERROR'); break;
  19                             case PREG_RECURSION_LIMIT_ERROR: echo('PREG_RECURSION_LIMIT_ERROR'); break;
  20                             case PREG_BAD_UTF8_ERROR: echo('PREG_BAD_UTF8_ERROR'); break;
  21                             case PREG_BAD_UTF8_OFFSET_ERROR: echo('PREG_BAD_UTF8_OFFSET_ERROR'); break;
  22                             default:
  23                                         //die("Unknown preg error.");
  24                                         return;
  25                         }
  26                         echo "<hr><pre>";
  27                         debug_print_backtrace();
  28                         die();
  29                 }
  30
  31
  32                 private function _push_stack(){
  33                         $this->stack[] = array($this->r, $this->nodes);
  34                 }
  35                 private function _pop_stack(){
  36                         list($this->r, $this->nodes) = array_pop($this->stack);
  37
  38                 }
  39
  40                 private function _get_var($name, $retNoKey=false){
  41                         $keys = array_map('trim',explode(".",$name));
  42                         if ($retNoKey && !array_key_exists($keys[0], $this->r)) return KEY_NOT_EXISTS;
  43                         $val = $this->r;
  44                         foreach($keys as $k) {
  45                                 $val = (isset($val[$k]) ? $val[$k] : null);
  46                         }
  47                         return $val;
  48                 }
  49
  50                 /**
  51                  * IF node
  52                  *
  53                  * {{ if <$var> }}...[{{ else }} ...] {{ endif }}
  54                  * {{ if <$var>==<val|$var> }}...[{{ else }} ...]{{ endif }}
  55                  * {{ if <$var>!=<val|$var> }}...[{{ else }} ...]{{ endif }}
  56                  */
  57                 private function _replcb_if($args){
  58                         if (strpos($args[2],"==")>0){
  59                                 list($a,$b) = array_map("trim",explode("==",$args[2]));
  60                                 $a = $this->_get_var($a);
  61                                 if ($b[0]=="$") $b =  $this->_get_var($b);
  62                                 $val = ($a == $b);
  63                         } else if (strpos($args[2],"!=")>0){
  64                                 list($a,$b) = explode("!=",$args[2]);
  65                                 $a = $this->_get_var($a);
  66                                 if ($b[0]=="$") $b =  $this->_get_var($b);
  67                                 $val = ($a != $b);
  68                         } else {
  69                                 $val = $this->_get_var($args[2]);
  70                         }
  71                         $x = preg_split("|{{ *else *}}|", $args[3]);
  72                         return ( $val ? $x[0] : (isset($x[1]) ? $x[1] : ""));
  73                 }
  74
  75                 /**
  76                  * FOR node
  77                  *
  78                  * {{ for <$var> as $name }}...{{ endfor }}
  79                  * {{ for <$var> as $key=>$name }}...{{ endfor }}
  80                  */
  81                 private function _replcb_for($args){
  82                         $m = array_map('trim', explode(" as ", $args[2]));
  83                         $x = explode("=>",$m[1]);
  84                         if (count($x) == 1) {
  85                                 $varname = $x[0];
  86                                 $keyname = "";
  87                         } else {
  88                                 list($keyname, $varname) = $x;
  89                         }
  90                         if ($m[0]=="" || $varname=="" || is_null($varname)) die("template error: 'for ".$m[0]." as ".$varname."'") ;
  91                         //$vals = $this->r[$m[0]];
  92                         $vals = $this->_get_var($m[0]);
  93                         $ret="";
  94                         if (!is_array($vals)) return $ret;
  95                         foreach ($vals as $k=>$v){
  96                                 $this->_push_stack();
  97                                 $r = $this->r;
  98                                 $r[$varname] = $v;
  99                                 if ($keyname!='') $r[$keyname] = $k;
 100                                 $ret .=  $this->replace($args[3], $r);
 101                                 $this->_pop_stack();
 102                         }
 103                         return $ret;
 104                 }
 105
 106                 /**
 107                  * INC node
 108                  *
 109                  * {{ inc <templatefile> [with $var1=$var2] }}{{ endinc }}
 110                  */
 111                 private function _replcb_inc($args){
 112                         if (strpos($args[2],"with")) {
 113                                 list($tplfile, $newctx) = array_map('trim', explode("with",$args[2]));
 114                         } else {
 115                                 $tplfile = trim($args[2]);
 116                                 $newctx = null;
 117                         }
 118
 119                         if ($tplfile[0]=="$") $tplfile = $this->_get_var($tplfile);
 120
 121                         $this->_push_stack();
 122                         $r = $this->r;
 123                         if (!is_null($newctx)) {
 124                                 list($a,$b) = array_map('trim', explode("=",$newctx));
 125                                 $r[$a] = $this->_get_var($b);
 126                         }
 127                         $this->nodes = Array();
 128                         $tpl = get_markup_template($tplfile);
 129                         $ret = $this->replace($tpl, $r);
 130                         $this->_pop_stack();
 131                         return $ret;
 132
 133                 }
 134
 135                 private function _replcb_node($m) {
 136                         $node = $this->nodes[$m[1]];
 137                         if (method_exists($this, "_replcb_".$node[1])){
 138                                 $s = call_user_func(array($this, "_replcb_".$node[1]),  $node);
 139                         } else {
 140                                 $s = "";
 141                         }
 142                         $s = preg_replace_callback('/\|\|([0-9]+)\|\|/', array($this, "_replcb_node"), $s);
 143                         return $s;
 144                 }
 145
 146                 private function _replcb($m){
 147                         //var_dump(array_map('htmlspecialchars', $m));
 148                         $this->done = false;
 149                         $this->nodes[] = (array) $m;
 150                         return "||". (count($this->nodes)-1) ."||";
 151                 }
 152
 153                 private function _build_nodes($s){
 154                         $this->done = false;
 155                         while (!$this->done){
 156                                 $this->done=true;
 157                                 $s = preg_replace_callback('|{{ *([a-z]*) *([^}]*)}}([^{]*({{ *else *}}[^{]*)?){{ *end\1 *}}|', array($this, "_replcb"), $s);
 158                                 if ($s==Null) $this->_preg_error();
 159                         }
 160                         //({{ *else *}}[^{]*)?
 161                         krsort($this->nodes);
 162                         return $s;
 163                 }
 164
 165
 166                 private function var_replace($s){
 167                         $m = array();
 168                         /** regexp:
 169                          * \$                                           literal $
 170                          * (\[)?                                        optional open square bracket
 171                          * ([a-zA-Z0-9-_]+\.?)+         var name, followed by optional
 172                          *                                                      dot, repeated at least 1 time
 173                          * (?(1)\])                                     if there was opened square bracket
 174                          *                                                      (subgrup 1), match close bracket
 175                          */
 176                         if (preg_match_all('/\$(\[)?([a-zA-Z0-9-_]+\.?)+(?(1)\])/', $s,$m)){
 177
 178                                 foreach($m[0] as $var){
 179                                         $varn = str_replace(array("[","]"), array("",""), $var);
 180                                         $val = $this->_get_var($varn, true);
 181                                         if ($val!=KEY_NOT_EXISTS)
 182                                                 $s = str_replace($var, $val, $s);
 183                                 }
 184                         }
 185
 186                         return $s;
 187                 }
 188
 189                 public function replace($s, $r) {
 190                         $this->r = $r;
 191
 192                         $s = $this->_build_nodes($s);
 193
 194                         $s = preg_replace_callback('/\|\|([0-9]+)\|\|/', array($this, "_replcb_node"), $s);
 195                         if ($s==Null) $this->_preg_error();
 196
 197                         // remove comments block
 198                         $s = preg_replace('/{#[^#]*#}/', "" , $s);
 199
 200                         // replace strings recursively (limit to 10 loops)
 201                         $os = ""; $count=0;
 202                         while($os!=$s && $count<10){
 203                                 $os=$s; $count++;
 204                                 $s = $this->var_replace($s);
 205                         }
 206                         return template_unescape($s);
 207                 }
 208         }
 209
 210         $t = new Template;
 211
 212
 213
 214
 215 function template_escape($s) {
 216
 217         return str_replace(array('$','{{'),array('!_Doll^Ars1Az_!','!_DoubLe^BraceS4Rw_!'),$s);
 218
 219
 220 }
 221
 222 function template_unescape($s) {
 223
 224         return str_replace(array('!_Doll^Ars1Az_!','!_DoubLe^BraceS4Rw_!'),array('$','{{'),$s);
 225
 226
 227
 228 }