pub(super) struct FqnContext {
    stack: Vec<String>,
}

impl FqnContext {
    pub fn new() -> Self {
        FqnContext { stack: Vec::new() }
    }

    pub fn push(&mut self, name: &str) {
        self.stack.push(name.to_string());
    }

    pub fn pop(&mut self) {
        self.stack.pop();
    }

    pub fn current(&self) -> String {
        let mut acc = String::new();
        for (i, name) in self.stack.iter().enumerate() {
            acc.push_str(name);
            if i != self.stack.len() - 1 {
                acc.push_str("::")
            }
        }
        acc
    }

    pub fn resolve(&self, name: &str) -> String {
        let mut acc = String::new();
        if !self.stack.is_empty() {
            acc.push_str(&self.current());
            acc.push_str("::");
        }
        acc.push_str(name);
        acc
    }
}