use std::error::Error;
use crate::ast::*;


pub trait ASTVisitor {
  fn visit(&mut self, ast: &mut AST) {
    self.block(&ast.statements);
  }

  fn block(&mut self, statements: &Vec<Statement>) {
    for statement in statements {
      self.statement(statement);
    }
  }

  fn statement(&mut self, statement: &Statement) {
    use StatementKind::*;
    match statement.kind {
      Expression(ref expr) => self.expression(expr),
      Declaration(ref decl) => self.declaration(decl),
      Import(ref import_spec) => self.import(import_spec),
    }
  }

  fn expression(&mut self, expression: &Expression) {
  }

  fn declaration(&mut self, declaration: &Declaration) {
  }

  fn import(&mut self, import: &ImportSpecifier) {
  }
}