include/libs/template_lite/internal/compile.parse_is_expr.php

   1 <?php
   2 /**
   3  * Template Lite compile IS exprenssion in IF tag - template internal module
   4  *
   5  * Type:         template
   6  * Name:         compile_parse_is_expr
   7  */
   8
   9 function compile_parse_is_expr($is_arg, $_args, &$object)
  10 {
  11         $expr_end = 0;
  12         $negate_expr = false;
  13
  14         if (($first_arg = array_shift($_args)) == 'not') {
  15                 $negate_expr = true;
  16                 $expr_type = array_shift($_args);
  17         }
  18         else
  19         {
  20                 $expr_type = $first_arg;
  21         }
  22
  23         switch ($expr_type) {
  24                 case 'even':
  25                         if (isset($_args[$expr_end]) && $_args[$expr_end] == 'by')
  26                         {
  27                                 $expr_end++;
  28                                 $expr_arg = $_args[$expr_end++];
  29                                 $expr = "!(1 & ($is_arg / " . $object->_parse_variable($expr_arg) . "))";
  30                         }
  31                         else
  32                         {
  33                                 $expr = "!(1 & $is_arg)";
  34                         }
  35                         break;
  36
  37                 case 'odd':
  38                         if (isset($_args[$expr_end]) && $_args[$expr_end] == 'by')
  39                         {
  40                                 $expr_end++;
  41                                 $expr_arg = $_args[$expr_end++];
  42                                 $expr = "(1 & ($is_arg / " . $object->_parse_variable($expr_arg) . "))";
  43                                 }
  44                                 else
  45                                 {
  46                                         $expr = "(1 & $is_arg)";
  47                                 }
  48                                 break;
  49
  50                         case 'div':
  51                                 if (@$_args[$expr_end] == 'by')
  52                                 {
  53                                         $expr_end++;
  54                                         $expr_arg = $_args[$expr_end++];
  55                                         $expr = "!($is_arg % " . $object->_parse_variable($expr_arg) . ")";
  56                                 }
  57                                 else
  58                                 {
  59                                         throw new Template_Exception("expecting 'by' after 'div'", $object);
  60                                 }
  61                         break;
  62
  63                         default:
  64                                 throw new Template_Exception("unknown 'is' expression - '$expr_type'", $object);
  65                                 break;
  66                 }
  67
  68         if ($negate_expr) {
  69                 $expr = "!($expr)";
  70         }
  71
  72         array_splice($_args, 0, $expr_end, $expr);
  73
  74         return $_args;
  75 }
  76
  77 ?>