/**
* Visit an element.
*
* @param \Hoa\Visitor\Element $element Element to visit.
* @param mixed &$handle Handle (reference).
* @param mixed $eldnah Handle (not reference).
* @return mixed
* @throws \Hoa\Ruler\Exception\Interpreter
*/
public function visit(Visitor\Element $element, &$handle = null, $eldnah = null)
{
$id = $element->getId();
$variable = false !== $eldnah;
switch ($id) {
case '#expression':
$this->_root = new Ruler\Model();
$this->_root->expression = $element->getChild(0)->accept($this, $handle, $eldnah);
return $this->_root;
case '#operation':
$children = $element->getChildren();
$left = $children[0]->accept($this, $handle, $eldnah);
$right = $children[2]->accept($this, $handle, $eldnah);
$name = $children[1]->accept($this, $handle, false);
return $this->_root->_operator($name, [$left, $right], false);
case '#variable_access':
$children = $element->getChildren();
$name = $children[0]->accept($this, $handle, $eldnah);
array_shift($children);
foreach ($children as $child) {
$_child = $child->accept($this, $handle, $eldnah);
switch ($child->getId()) {
case '#array_access':
$name->index($_child);
break;
case '#attribute_access':
$name->attribute($_child);
break;
case '#method_access':
$name->call($_child);
break;
}
}
return $name;
case '#array_access':
return $element->getChild(0)->accept($this, $handle, $eldnah);
case '#attribute_access':
return $element->getChild(0)->accept($this, $handle, false);
case '#method_access':
return $element->getChild(0)->accept($this, $handle, $eldnah);
case '#array_declaration':
$out = [];
foreach ($element->getChildren() as $child) {
$out[] = $child->accept($this, $handle, $eldnah);
}
return $out;
case '#function_call':
$children = $element->getChildren();
$name = $children[0]->accept($this, $handle, false);
array_shift($children);
$arguments = [];
foreach ($children as $child) {
$arguments[] = $child->accept($this, $handle, $eldnah);
}
return $this->_root->_operator($name, $arguments, true);
case '#and':
case '#or':
case '#xor':
$name = substr($id, 1);
$children = $element->getChildren();
$left = $children[0]->accept($this, $handle, $eldnah);
$right = $children[1]->accept($this, $handle, $eldnah);
return $this->_root->operation($name, [$left, $right]);
case '#not':
return $this->_root->operation('not', [$element->getChild(0)->accept($this, $handle, $eldnah)]);
case 'token':
$token = $element->getValueToken();
$value = $element->getValueValue();
switch ($token) {
case 'identifier':
return true === $variable ? $this->_root->variable($value) : $value;
case 'true':
return true;
case 'false':
return false;
case 'null':
return null;
case 'float':
return floatval($value);
case 'integer':
return intval($value);
case 'string':
return str_replace('\\' . $value[0], $value[0], substr($value, 1, -1));
default:
throw new Ruler\Exception\Interpreter('Token %s is unknown.', 0, $token);
}
break;
default:
throw new Ruler\Exception\Interpreter('Element %s is unknown.', 1, $id);
}
return;
}
