/**
* Calculates price based on expression
*
* @param Product $product The Product object to get information
* @param String $expression The expression to parse
* @param array $values Strings to replaces
* @return int > 0 if OK, < 1 if KO
*/
public function parseExpression($product, $expression, $values)
{
global $user;
//Accessible product values by expressions
$values = array_merge($values, array("tva_tx" => $product->tva_tx, "localtax1_tx" => $product->localtax1_tx, "localtax2_tx" => $product->localtax2_tx, "weight" => $product->weight, "length" => $product->length, "surface" => $product->surface, "price_min" => $product->price_min));
//Retrieve all extrafield for product and add it to values
$extrafields = new ExtraFields($this->db);
$extralabels = $extrafields->fetch_name_optionals_label('product', true);
$product->fetch_optionals($product->id, $extralabels);
foreach ($extrafields->attribute_label as $key => $label) {
$values["extrafield_" . $key] = $product->array_options['options_' . $key];
}
//Process any pending updaters
$price_updaters = new PriceGlobalVariableUpdater($this->db);
foreach ($price_updaters->listPendingUpdaters() as $entry) {
//Schedule the next update by adding current timestamp (secs) + interval (mins)
$entry->update_next_update(dol_now() + $entry->update_interval * 60, $user);
//Do processing
$res = $entry->process();
//Store any error or clear status if OK
$entry->update_status($res < 1 ? $entry->error : '', $user);
}
//Get all global values
$price_globals = new PriceGlobalVariable($this->db);
foreach ($price_globals->listGlobalVariables() as $entry) {
$values["global_" . $entry->code] = $entry->value;
}
//Check if empty
$expression = trim($expression);
if (empty($expression)) {
$this->error = array(20, null);
return -2;
}
//Prepare the lib, parameters and values
$em = new EvalMath();
$em->suppress_errors = true;
//Don't print errors on page
$this->error_expr = null;
$last_result = null;
//Iterate over each expression splitted by $separator_chr
$expression = str_replace("\n", $this->separator_chr, $expression);
foreach ($values as $key => $value) {
$expression = str_replace($this->special_chr . $key . $this->special_chr, "{$value}", $expression);
}
$expressions = explode($this->separator_chr, $expression);
$expressions = array_slice($expressions, 0, $this->limit);
foreach ($expressions as $expr) {
$expr = trim($expr);
if (!empty($expr)) {
$last_result = $em->evaluate($expr);
$this->error = $em->last_error_code;
if ($this->error !== null) {
//$em->last_error is null if no error happened, so just check if error is not null
$this->error_expr = $expr;
return -3;
}
}
}
$vars = $em->vars();
if (empty($vars["price"])) {
$vars["price"] = $last_result;
}
if (!isset($vars["price"])) {
$this->error = array(21, $expression);
return -4;
}
if ($vars["price"] < 0) {
$this->error = array(22, $expression);
return -5;
}
return $vars["price"];
}
