function evalStatement($data, $input, $answer)
{
$m = new EvalMath();
$ops = array("==", "!=", "GE", "LE", "GT", "LT");
$numStatement = 0;
$numOperator = 0;
$statement1 = "";
$statement2 = "";
for ($j = 0; $j <= count($data) - 1; $j++) {
if (in_array($data[$j], $ops)) {
$numStatement++;
$numOperator = array_search($data[$j], $ops);
} else {
if ($numStatement == 0) {
$statement1 .= $data[$j] . " ";
} else {
$statement2 .= $data[$j] . " ";
}
}
}
$equation = genEquation($statement1, $input, $answer);
$value1 = $m->evaluate($equation);
if ($value1 == "") {
$value1 = $equation;
}
$equation = genEquation($statement2, $input, $answer);
$value2 = $m->evaluate($equation);
if ($value2 == "") {
$value2 = $equation;
}
if (condicional($value1, $ops[$numOperator], $value2)) {
return TRUE;
} else {
return FALSE;
}
}
function Evaluation($id, $value, $input, $exercise_id, $operatorData, $answer)
{
$m = new EvalMath();
$xml = simplexml_load_file($exercise_id) or die("Error: Cannot create object");
$count_options = $xml->input[$id]->count();
for ($i = 0; $i < $count_options; $i++) {
$operator = $xml->input[$id]->option[$i]->operator;
$equation = trim($xml->input[$id]->option[$i]->equation);
$data = explode(" ", $equation);
$equation = "";
$operatorDT = "";
if ($operator == 'IF') {
// retrieve elements from de conditional
$cont = 0;
foreach ($data as $element) {
if ($element[0] == 'v') {
$trimmed = intval(ltrim($element, "v"));
$value[$cont] = strval($input[$trimmed]);
} elseif ($element[0] == 'a') {
$trimmed = intval(ltrim($element, "a"));
$value[$cont] = strval($answer[$trimmed - 1]);
} else {
$value[$cont] = strval($element);
}
//if($value[$cont] == "==")
// return "ccc";
$cont++;
}
// evaluate one or two conditional statements
if ($cont <= 3) {
if (condicional($value[0], $data[1], $value[2])) {
return $xml->input[$id]->option[$i]->result;
$i = $count_options;
}
} else {
if ($data[3] == "and") {
if (condicional($value[0], $data[1], $value[2]) and condicional($value[4], $data[5], $value[6])) {
return $xml->input[$id]->option[$i]->result;
$i = $count_options;
}
} else {
if ($data[3] == "or") {
if (condicional($value[0], $data[1], $value[2]) or condicional($value[4], $data[5], $value[6])) {
return $xml->input[$id]->option[$i]->result;
$i = $count_options;
}
}
}
}
/*
switch($data[1])
{
case "==":
if($equation == $data[2])
{return $xml->input[$id]->option[$i]->result;
$i=$count_options;
}
break;
case "!=": if($equation != $data[2])
{return $xml->input[$id]->option[$i]->result;
$i=$count_options;
}
break;
case "GT": if($equation > $data[2])
{return $xml->input[$id]->option[$i]->result;
$i=$count_options;
}
break;
case "GE": if($equation >= $data[2])
{return $xml->input[$id]->option[$i]->result;
$i=$count_options;
}
break;
case "LT": if($equation < $data[2])
{return $xml->input[$id]->option[$i]->result;
$i=$count_options;
}
break;
case "LE": if($equation <= $data[2])
{return $xml->input[$id]->option[$i]->result;
$i=$count_options;
}
break;
} // SWITCH
*/
} else {
foreach ($data as $element) {
if (is_numeric($element)) {
$equation .= $element;
} else {
if ($element[0] == 'o') {
$operatorDT = ltrim($element, "o");
} elseif ($element[0] == 'v') {
$trimmed = intval(ltrim($element, "v"));
$equation .= $input[$trimmed];
} elseif ($element[0] == 'a') {
$trimmed = intval(ltrim($element, "a"));
$equation .= $answer[$trimmed - 1];
} else {
$equation .= $element;
}
/*
elseif (strpos($element,'v') === False)
{
$equation .= $element;
}
else
{
$trimmed = intval(ltrim($element, "v"));
$equation .= $input[$trimmed];
}
*/
}
}
// return $equation[3];
// $equation = "mcm(2,4)";
if (strstr($equation, "mcm")) {
$valor = explode(",", substr($equation, 3));
$equation_result = mcm(intval($valor[0]), intval($valor[1]));
} elseif (strstr($equation, "smn")) {
$valor = explode(",", substr($equation, 3));
$equation_result = smn(intval($valor[0]), intval($valor[1]));
} elseif (strstr($equation, "smd")) {
$valor = explode(",", substr($equation, 3));
$equation_result = smd(intval($valor[0]), intval($valor[1]));
} elseif (strstr($equation, "cod")) {
$valor = explode(",", substr($equation, 3));
$equation_result = cod(intval($valor[0]), intval($valor[1]));
} elseif (strstr($equation, "red")) {
$valor = explode(",", substr($equation, 3));
$equation_result = red(intval($valor[0]), intval($valor[1]));
} elseif (strstr($equation, "txt")) {
$valor = explode(",", substr($equation, 3));
$equation_result = txt($valor[0], $valor[1]);
} else {
$equation_result = $m->evaluate($equation);
}
if ($operatorDT == "") {
$operatorData = "";
}
// return strval($equation_result);
switch ($operator) {
case "==":
if ($equation_result == $value && $operatorDT == $operatorData) {
return $xml->input[$id]->option[$i]->result;
$i = $count_options;
}
break;
case "!=":
if ($equation_result != $value && $operatorDT == $operatorData) {
return $xml->input[$id]->option[$i]->result;
$i = $count_options;
}
break;
case "GT":
if ($equation_result > $value && $operatorDT == $operatorData) {
return $xml->input[$id]->option[$i]->result;
$i = $count_options;
}
break;
case "GE":
if ($equation_result >= $value && $operatorDT == $operatorData) {
return $xml->input[$id]->option[$i]->result;
$i = $count_options;
}
break;
case "LT":
if ($equation_result < $value && $operatorDT == $operatorData) {
return $xml->input[$id]->option[$i]->result;
$i = $count_options;
}
break;
case "LE":
if ($equation_result <= $value && $operatorDT == $operatorData) {
return $xml->input[$id]->option[$i]->result;
$i = $count_options;
}
break;
}
// SWITCH
}
// else IF
}
// option's LOOP
}
