/**
* @param NodeInterface $node
* @return bool
*/
public function _evalIsZero(NodeInterface $node)
{
try {
return $this->evalVisitor->visit($node) == 0;
} catch (\OutOfBoundsException $e) {
return false;
}
}
public function testTree3()
{
$deriver = new DerivationVisitor('x');
$evaluator = new EvaluationVisitor(['x' => 2]);
$f = Tree::mult(3, Tree::pow('x', 2))->add(Tree::mult(2, 'x'))->add(3);
$this->assertEquals(19, $evaluator->visit($f));
$this->assertEquals(14, $evaluator->visit($deriver->visit($f)));
}
public function testAddNodeWithVariable()
{
$deriver = new DerivationVisitor('x');
$eval = new EvaluationVisitor(['x' => 3]);
$node = new BinaryMultiplicationNode(new ConstantNode(2), new VariableNode('x'));
$d = $deriver->visit($node);
$dd = $deriver->visit($d);
$this->assertEquals(6, $eval->visit($node));
$this->assertEquals(2, $eval->visit($d));
$this->assertEquals(0, $eval->visit($dd));
}
public function testPowerNodeWithVar()
{
$deriver = new DerivationVisitor('x');
$eval2 = new EvaluationVisitor(['x' => 2]);
$eval3 = new EvaluationVisitor(['x' => 3]);
$node = new PowerNode(new VariableNode('x'), new ConstantNode(3));
$d = $deriver->visit($node);
$this->assertEquals(12, $eval2->visit($d));
$this->assertEquals(8, $eval2->visit($node));
$this->assertEquals(27, $eval3->visit($d));
$this->assertEquals(27, $eval3->visit($node));
}
/**
* SimplifyVisitor constructor.
*/
private function __construct()
{
$this->isConstantVisitor = new TypeVisitor(ConstantNode::class);
$this->evaluationVisitor = EvaluationVisitor::default();
$this->isZeroVisitor = IsZeroVisitor::init();
$this->isOneVisitor = IsOneVisitor::init();
}
