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
  17                         switch(preg_last_error()){
  18                             case PREG_INTERNAL_ERROR: echo('PREG_INTERNAL_ERROR'); break;
  19                             case PREG_BACKTRACK_LIMIT_ERROR: echo('PREG_BACKTRACK_LIMIT_ERROR'); break;
  20                             case PREG_RECURSION_LIMIT_ERROR: echo('PREG_RECURSION_LIMIT_ERROR'); break;
  21                             case PREG_BAD_UTF8_ERROR: echo('PREG_BAD_UTF8_ERROR'); break;
  22 // This is only valid for php > 5.3, not certain how to code around it for unit tests
  23 //                          case PREG_BAD_UTF8_OFFSET_ERROR: echo('PREG_BAD_UTF8_OFFSET_ERROR'); break;
  24                             default:
  25                                         //die("Unknown preg error.");
  26                                         return;
  27                         }
  28                         echo "<hr><pre>";
  29                         debug_print_backtrace();
  30                         die();
  31                 }
  32
  33
  34                 private function _push_stack(){
  35                         $this->stack[] = array($this->r, $this->nodes);
  36                 }
  37                 private function _pop_stack(){
  38                         list($this->r, $this->nodes) = array_pop($this->stack);
  39
  40                 }
  41
  42                 private function _get_var($name, $retNoKey=false){
  43                         $keys = array_map('trim',explode(".",$name));
  44                         if ($retNoKey && !array_key_exists($keys[0], $this->r)) return KEY_NOT_EXISTS;
  45                         $val = $this->r;
  46                         foreach($keys as $k) {
  47                                 $val = (isset($val[$k]) ? $val[$k] : null);
  48                         }
  49                         return $val;
  50                 }
  51
  52                 /**
  53                  * IF node
  54                  *
  55                  * {{ if <$var> }}...[{{ else }} ...] {{ endif }}
  56                  * {{ if <$var>==<val|$var> }}...[{{ else }} ...]{{ endif }}
  57                  * {{ if <$var>!=<val|$var> }}...[{{ else }} ...]{{ endif }}
  58                  */
  59                 private function _replcb_if($args){
  60                         if (strpos($args[2],"==")>0){
  61                                 list($a,$b) = array_map("trim",explode("==",$args[2]));
  62                                 $a = $this->_get_var($a);
  63                                 if ($b[0]=="$") $b =  $this->_get_var($b);
  64                                 $val = ($a == $b);
  65                         } else if (strpos($args[2],"!=")>0){
  66                                 list($a,$b) = array_map("trim", explode("!=",$args[2]));
  67                                 $a = $this->_get_var($a);
  68                                 if ($b[0]=="$") $b =  $this->_get_var($b);
  69                                 $val = ($a != $b);
  70                         } else {
  71                                 $val = $this->_get_var($args[2]);
  72                         }
  73                         $x = preg_split("|{{ *else *}}|", $args[3]);
  74                         return ( $val ? $x[0] : (isset($x[1]) ? $x[1] : ""));
  75                 }
  76
  77                 /**
  78                  * FOR node
  79                  *
  80                  * {{ for <$var> as $name }}...{{ endfor }}
  81                  * {{ for <$var> as $key=>$name }}...{{ endfor }}
  82                  */
  83                 private function _replcb_for($args){
  84                         $m = array_map('trim', explode(" as ", $args[2]));
  85                         $x = explode("=>",$m[1]);
  86                         if (count($x) == 1) {
  87                                 $varname = $x[0];
  88                                 $keyname = "";
  89                         } else {
  90                                 list($keyname, $varname) = $x;
  91                         }
  92                         if ($m[0]=="" || $varname=="" || is_null($varname)) die("template error: 'for ".$m[0]." as ".$varname."'") ;
  93                         //$vals = $this->r[$m[0]];
  94                         $vals = $this->_get_var($m[0]);
  95                         $ret="";
  96                         if (!is_array($vals)) return $ret;
  97                         foreach ($vals as $k=>$v){
  98                                 $this->_push_stack();
  99                                 $r = $this->r;
 100                                 $r[$varname] = $v;
 101                                 if ($keyname!='') $r[$keyname] = (($k === 0) ? '0' : $k);
 102                                 $ret .=  $this->replace($args[3], $r);
 103                                 $this->_pop_stack();
 104                         }
 105                         return $ret;
 106                 }
 107
 108                 /**
 109                  * INC node
 110                  *
 111                  * {{ inc <templatefile> [with $var1=$var2] }}{{ endinc }}
 112                  */
 113                 private function _replcb_inc($args){
 114                         if (strpos($args[2],"with")) {
 115                                 list($tplfile, $newctx) = array_map('trim', explode("with",$args[2]));
 116                         } else {
 117                                 $tplfile = trim($args[2]);
 118                                 $newctx = null;
 119                         }
 120
 121                         if ($tplfile[0]=="$") $tplfile = $this->_get_var($tplfile);
 122
 123                         $this->_push_stack();
 124                         $r = $this->r;
 125                         if (!is_null($newctx)) {
 126                                 list($a,$b) = array_map('trim', explode("=",$newctx));
 127                                 $r[$a] = $this->_get_var($b);
 128                         }
 129                         $this->nodes = Array();
 130                         $tpl = get_markup_template($tplfile);
 131                         $ret = $this->replace($tpl, $r);
 132                         $this->_pop_stack();
 133                         return $ret;
 134
 135                 }
 136
 137                 /**
 138                  * DEBUG node
 139                  *
 140                  * {{ debug $var [$var [$var [...]]] }}{{ enddebug }}
 141                  *
 142                  * replace node with <pre>var_dump($var, $var, ...);</pre>
 143                  */
 144                 private function _replcb_debug($args){
 145                         $vars = array_map('trim', explode(" ",$args[2]));
 146                         $vars[] = $args[1];
 147
 148                         $ret = "<pre>";
 149                         foreach ($vars as $var){
 150                                 $ret .= htmlspecialchars(var_export( $this->_get_var($var), true ));
 151                                 $ret .= "\n";
 152                         }
 153                         $ret .= "</pre>";
 154                         return $ret;
 155                 }
 156
 157                 private function _replcb_node($m) {
 158                         $node = $this->nodes[$m[1]];
 159                         if (method_exists($this, "_replcb_".$node[1])){
 160                                 $s = call_user_func(array($this, "_replcb_".$node[1]),  $node);
 161                         } else {
 162                                 $s = "";
 163                         }
 164                         $s = preg_replace_callback('/\|\|([0-9]+)\|\|/', array($this, "_replcb_node"), $s);
 165                         return $s;
 166                 }
 167
 168                 private function _replcb($m){
 169                         //var_dump(array_map('htmlspecialchars', $m));
 170                         $this->done = false;
 171                         $this->nodes[] = (array) $m;
 172                         return "||". (count($this->nodes)-1) ."||";
 173                 }
 174
 175                 private function _build_nodes($s){
 176                         $this->done = false;
 177                         while (!$this->done){
 178                                 $this->done=true;
 179                                 $s = preg_replace_callback('|{{ *([a-z]*) *([^}]*)}}([^{]*({{ *else *}}[^{]*)?){{ *end\1 *}}|', array($this, "_replcb"), $s);
 180                                 if ($s==Null) $this->_preg_error();
 181                         }
 182                         //({{ *else *}}[^{]*)?
 183                         krsort($this->nodes);
 184                         return $s;
 185                 }
 186
 187
 188                 private function var_replace($s){
 189                         $m = array();
 190                         /** regexp:
 191                          * \$                                           literal $
 192                          * (\[)?                                        optional open square bracket
 193                          * ([a-zA-Z0-9-_]+\.?)+         var name, followed by optional
 194                          *                                                      dot, repeated at least 1 time
 195                          * (?(1)\])                                     if there was opened square bracket
 196                          *                                                      (subgrup 1), match close bracket
 197                          */
 198                         if (preg_match_all('/\$(\[)?([a-zA-Z0-9-_]+\.?)+(?(1)\])/', $s,$m)){
 199
 200                                 foreach($m[0] as $var){
 201                                         $varn = str_replace(array("[","]"), array("",""), $var);
 202                                         $val = $this->_get_var($varn, true);
 203                                         if ($val!=KEY_NOT_EXISTS)
 204                                                 $s = str_replace($var, $val, $s);
 205                                 }
 206                         }
 207
 208                         return $s;
 209                 }
 210
 211                 public function replace($s, $r) {
 212                         $this->r = $r;
 213
 214                         $s = $this->_build_nodes($s);
 215
 216                         $s = preg_replace_callback('/\|\|([0-9]+)\|\|/', array($this, "_replcb_node"), $s);
 217                         if ($s==Null) $this->_preg_error();
 218
 219                         // remove comments block
 220                         $s = preg_replace('/{#[^#]*#}/', "" , $s);
 221
 222                         // replace strings recursively (limit to 10 loops)
 223                         $os = ""; $count=0;
 224                         while($os!=$s && $count<10){
 225                                 $os=$s; $count++;
 226                                 $s = $this->var_replace($s);
 227                         }
 228                         return $s;
 229                 }
 230         }
 231
 232         $t = new Template;
 233
 234
 235
 236
 237 function template_escape($s) {
 238
 239         return str_replace(array('$','{{'),array('!_Doll^Ars1Az_!','!_DoubLe^BraceS4Rw_!'),$s);
 240
 241
 242 }
 243
 244 function template_unescape($s) {
 245
 246         return str_replace(array('!_Doll^Ars1Az_!','!_DoubLe^BraceS4Rw_!'),array('$','{{'),$s);
 247
 248
 249
 250 }