public function getRangeMaxBase()
{
if (is_numeric($this->getRangeMax())) {
if (is_object($this->getUnit())) {
include_once "./Services/Math/classes/class.ilMath.php";
return ilMath::_mul($this->getRangeMax(), $this->getUnit()->getFactor(), 100);
}
}
return $this->getRangeMax();
}
function getBaseValue()
{
if (!is_object($this->getUnit())) {
return $this->value;
} else {
include_once "./Services/Math/classes/class.ilMath.php";
return ilMath::_mul($this->value, $this->getUnit()->getFactor());
}
}
function pfx($tokens, $vars = array())
{
if ($tokens == false) {
return false;
}
$stack = new EvalMathStack();
foreach ($tokens as $token) {
// nice and easy
// if the token is a binary operator, pop two values off the stack, do the operation, and push the result back on
if (in_array($token, array('+', '-', '*', '/', '^'))) {
if (is_null($op2 = $stack->pop())) {
return $this->trigger("internal error");
}
if (is_null($op1 = $stack->pop())) {
return $this->trigger("internal error");
}
include_once "class.ilMath.php";
switch ($token) {
case '+':
$stack->push(ilMath::_add($op1, $op2));
break;
case '-':
$stack->push(ilMath::_sub($op1, $op2));
break;
case '*':
$stack->push(ilMath::_mul($op1, $op2));
break;
case '/':
if ($op2 == 0) {
return $this->trigger("division by zero");
}
$stack->push(ilMath::_div($op1, $op2));
break;
case '^':
$stack->push(ilMath::_pow($op1, $op2));
break;
}
// if the token is a unary operator, pop one value off the stack, do the operation, and push it back on
} elseif ($token == "_") {
$stack->push(-1 * $stack->pop());
// if the token is a function, pop arguments off the stack, hand them to the function, and push the result back on
} elseif (preg_match("/^([a-z]\\w*)\\(\$/", $token, $matches)) {
// it's a function!
$fnn = $matches[1];
if (in_array($fnn, $this->fb)) {
// built-in function:
if (is_null($op1 = $stack->pop())) {
return $this->trigger("internal error");
}
$fnn = preg_replace("/^arc/", "a", $fnn);
// for the 'arc' trig synonyms
if ($fnn == 'ln') {
$fnn = 'log';
}
eval('$stack->push(' . $fnn . '($op1));');
// perfectly safe eval()
} elseif (array_key_exists($fnn, $this->f)) {
// user function
// get args
$args = array();
for ($i = count($this->f[$fnn]['args']) - 1; $i >= 0; $i--) {
if (is_null($args[$this->f[$fnn]['args'][$i]] = $stack->pop())) {
return $this->trigger("internal error");
}
}
$stack->push($this->pfx($this->f[$fnn]['func'], $args));
// yay... recursion!!!!
}
// if the token is a number or variable, push it on the stack
} else {
if (is_numeric($token)) {
$stack->push($token);
} elseif (($hex = $this->from_hexbin($token)) !== FALSE) {
$stack->push($hex);
} elseif (array_key_exists($token, $this->v)) {
$stack->push($this->v[$token]);
} elseif (array_key_exists($token, $vars)) {
$stack->push($vars[$token]);
} else {
return $this->trigger("undefined variable '{$token}'");
}
}
}
// when we're out of tokens, the stack should have a single element, the final result
if ($stack->count != 1) {
return $this->trigger("internal error");
}
return $stack->pop();
}
