/**
* Replace elements expression with value from $formObj
*
* @param string $expression
* @param EasyForm $formObj
* @return mixed
*/
protected static function replaceElementsExpr($expression, $formObj)
{
$script = "";
$start = 0;
// replace [field] with field value
while (true) {
$pos0 = strpos($expression, "[", $start);
$pos1 = strpos($expression, "]", $start);
if ($pos0 === false) {
$script .= substr($expression, $start);
break;
}
if ($pos0 >= 0 && $pos1 > $pos0) {
$script .= substr($expression, $start, $pos0 - $start);
$start = $pos1 + 1;
$elementName = substr($expression, $pos0 + 1, $pos1 - $pos0 - 1);
// get field value
$element = $formObj->getElement($elementName);
if ($element) {
$fldval = $element->getValue();
} else {
$fldval = null;
}
if ($fldval !== null) {
$script .= $fldval;
} else {
//$script .= substr($expression, $pos0, $pos1 - $pos0);
//return "fail to evaluate $expression";
return $expression;
// return the original expression once it can't find element
}
} elseif ($pos0 >= 0 && $pos1 <= $pos0) {
break;
}
}
return $script;
}