public function visit(Node $visitable)
{
// node format
if ($visitable instanceof Terminal || $visitable instanceof Identifier) {
$this->leafFormatDecl .= " n{$this->currentNumber};";
} else {
$this->nodeFormatDecl .= " n{$this->currentNumber};";
}
// node decl
if ($visitable instanceof Terminal || $visitable instanceof Identifier) {
$label = "{{$visitable->getNodeName()}|" . addcslashes($visitable->value, '"{}|') . "}";
} else {
if ($visitable instanceof Rule) {
$label = "{{$visitable->getNodeName()}|{$visitable->name}}";
} else {
$label = $visitable->getNodeName();
}
}
$this->nodeDecl .= " n{$this->currentNumber} [label=\"{$label}\"];" . PHP_EOL;
// collect for edge decl
$this->idNodeMap[$this->currentNumber] = $visitable;
// next
$this->currentNumber++;
}
/**
* Formats nodes two strings.
*
* {@link Rule}, {@link Terminal} ans {@link Identifier} nodes will be
* rendered with their attributes name or value.
*
* @param Node $n Formatted node.
*
* @return string
*/
public static function formatNode(Node $n)
{
$text = "[{$n->getNodeName()}";
if ($n instanceof Rule && !empty($n->name)) {
$text .= "='{$n->name}'";
} else {
if ($n instanceof Terminal || $n instanceof Identifier) {
if (!empty($n->value)) {
$text .= "='{$n->value}'";
}
}
}
$text .= "]";
return $text;
}
/**
* Generates closing tags for composite nodes.
*
* @param Node $visitable Visited node.
*
* @return void
*/
public function afterVisit(Node $visitable)
{
if ($visitable instanceof Composite && $visitable->hasChildren()) {
$this->indentationLevel--;
$this->append("\n" . $this->indent() . self::createCloseTag($visitable->getNodeName()));
}
}
