Gets the token offset of the first token that is part of this node.
The offset is an index into the array returned by Lexer::getTokens().
Requires the 'startTokenPos' attribute to be enabled in the lexer (DISABLED by default).
int Token start position (or -1 if not available)
Overrides Node::getStartTokenPos
public function getStartTokenPos() : int { return $this->attributes['startTokenPos'] ?? -1; }