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1 <?php |
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2 /** |
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3 * Smarty plugin |
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4 * @package Smarty |
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5 * @subpackage plugins |
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6 */ |
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7 |
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8 |
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9 /** |
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10 * Smarty {math} function plugin |
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11 * |
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12 * Type: function<br> |
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13 * Name: math<br> |
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14 * Purpose: handle math computations in template<br> |
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15 * @link http://smarty.php.net/manual/en/language.function.math.php {math} |
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16 * (Smarty online manual) |
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17 * @author Monte Ohrt <monte at ohrt dot com> |
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18 * @param array |
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19 * @param Smarty |
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20 * @return string |
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21 */ |
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22 function smarty_function_math($params, &$smarty) |
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23 { |
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24 // be sure equation parameter is present |
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25 if (empty($params['equation'])) { |
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26 $smarty->trigger_error("math: missing equation parameter"); |
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27 return; |
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28 } |
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29 |
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30 $equation = $params['equation']; |
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31 |
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32 // make sure parenthesis are balanced |
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33 if (substr_count($equation,"(") != substr_count($equation,")")) { |
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34 $smarty->trigger_error("math: unbalanced parenthesis"); |
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35 return; |
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36 } |
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37 |
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38 // match all vars in equation, make sure all are passed |
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39 preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]+)!",$equation, $match); |
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40 $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10', |
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41 'max','min','pi','pow','rand','round','sin','sqrt','srand','tan'); |
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42 |
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43 foreach($match[1] as $curr_var) { |
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44 if ($curr_var && !in_array($curr_var, array_keys($params)) && !in_array($curr_var, $allowed_funcs)) { |
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45 $smarty->trigger_error("math: function call $curr_var not allowed"); |
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46 return; |
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47 } |
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48 } |
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49 |
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50 foreach($params as $key => $val) { |
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51 if ($key != "equation" && $key != "format" && $key != "assign") { |
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52 // make sure value is not empty |
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53 if (strlen($val)==0) { |
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54 $smarty->trigger_error("math: parameter $key is empty"); |
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55 return; |
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56 } |
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57 if (!is_numeric($val)) { |
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58 $smarty->trigger_error("math: parameter $key: is not numeric"); |
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59 return; |
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60 } |
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61 $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation); |
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62 } |
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63 } |
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64 |
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65 eval("\$smarty_math_result = ".$equation.";"); |
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66 |
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67 if (empty($params['format'])) { |
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68 if (empty($params['assign'])) { |
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69 return $smarty_math_result; |
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70 } else { |
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71 $smarty->assign($params['assign'],$smarty_math_result); |
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72 } |
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73 } else { |
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74 if (empty($params['assign'])){ |
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75 printf($params['format'],$smarty_math_result); |
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76 } else { |
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77 $smarty->assign($params['assign'],sprintf($params['format'],$smarty_math_result)); |
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78 } |
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79 } |
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80 } |
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81 |
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82 /* vim: set expandtab: */ |
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83 |
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84 ?> |