Struct lib_ruby_parser::traverse::visitor::Visitor

pub struct Visitor<T> where
    T: Observer,  {
    pub observer: T,
}

Generic visitor of Node.

It doesn’t do anything on its own, but it notifies given Observer.

struct MyObserver {
    pub numbers: Vec<nodes::Int>,
}

impl Observer for MyObserver {
    fn on_int(&mut self, node: &nodes::Int) {
        self.numbers.push(node.clone())
    }
}

let source = "2 + 3";
let mut parser = Parser::new(source.as_bytes(), ParserOptions::default());
let ast = parser.do_parse().ast.unwrap();

let observer = MyObserver { numbers: vec![] };
let visitor = Visitor { observer };

visitor.visit_root(&ast);

println!("{:?}", visitor.observer.numbers);
// => [Int { value: "2" }, Int { value: "3" }]

Fields

observer: T

Observer of the visitor, receives calls like on_int(&mut self, node: nodes::Int)

Implementations

impl<T> Visitor<T> where
    T: Observer, 

pub fn visit_root(&mut self, node: &Node)

Starts traversing on a given node

Trait Implementations

impl<T: Debug> Debug for Visitor<T> where
    T: Observer, 

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.