if ($method == 'hint') {
$eq['left'] = postfix($expr[0]);
$eq['right'] = postfix($expr[1]);
$distribute = distribute($eq);
// var_dump($distribute);
// var_dump($eq);
if ($distribute != $eq) {
$result = infix($distribute['left']) . " = " . infix($distribute['right']);
echo json_encode(array('result' => $result, 'finalAnswer' => false));
return "";
}
$firststep = firststep($distribute);
// var_dump($firststep);
// var_dump($distribute);
if ($firststep != $distribute) {
$result = infix($firststep['left']) . " = " . infix($firststep['right']);
echo json_encode(array('result' => $result, 'finalAnswer' => false));
return "";
}
$eq['left'] = analyze($firststep['left'], 'left');
$eq['right'] = analyze($firststep['right'], 'right');
$eq['left'] = array_pop($eq['left']);
$eq['right'] = array_pop($eq['right']);
// var_dump($eq);
// var_dump($firststep);
if ($eq != $firststep) {
$result = $eq['left'] . "=" . $eq['right'];
echo json_encode(array('result' => $result, 'finalAnswer' => false));
return "";
}
$result = simplify($eq['left'], $eq['right']);
function dja_init_operators()
{
/*
* Operator precedence follows Python.
* NB - we can get slightly more accurate syntax error messages by not using the
* same object for '==' and '='.
* We defer variable evaluation to the lambda to ensure that terms are
* lazily evaluated using Python's boolean parsing logic.
*/
$operators = array('or' => infix(6, function ($context, $x, $y) {
return $x->eval_($context) || $y->eval_($context);
}), 'and' => infix(7, function ($context, $x, $y) {
return $x->eval_($context) && $y->eval_($context);
}), 'not' => prefix(8, function ($context, $x) {
return !$x->eval_($context);
}), 'in' => infix(9, function ($context, $x, $y) {
return in_array($x->eval_($context), $y->eval_($context));
}), 'not in' => infix(9, function ($context, $x, $y) {
return !in_array($x->eval_($context), $y->eval_($context));
}), '=' => infix(10, function ($context, $x, $y) {
return $x->eval_($context) == $y->eval_($context);
}), '==' => infix(10, function ($context, $x, $y) {
return $x->eval_($context) == $y->eval_($context);
}), '!=' => infix(10, function ($context, $x, $y) {
return $x->eval_($context) != $y->eval_($context);
}), '>' => infix(10, function ($context, $x, $y) {
return $x->eval_($context) > $y->eval_($context);
}), '>=' => infix(10, function ($context, $x, $y) {
return $x->eval_($context) >= $y->eval_($context);
}), '<' => infix(10, function ($context, $x, $y) {
return $x->eval_($context) < $y->eval_($context);
}), '<=' => infix(10, function ($context, $x, $y) {
return $x->eval_($context) <= $y->eval_($context);
}));
// Assign 'id' to each:
foreach ($operators as $key => $op) {
$op->id = $key;
$operators[$key] = $op;
}
// Hmm, globals again...
$GLOBALS['DJA_OPERATORS'] = $operators;
}
