//
// ClassLister.java: list names of classes in AST
//

import lexer.*;
import node.*;
import parser.*;
import analysis.*;
import java.io.*;
import java.util.ArrayList;

public class ClassLister extends DepthFirstAdapter
{
  protected ArrayList<String> classes = new ArrayList<>();
  public ArrayList<String> classNames() { return classes; }

  @Override
  public void caseAMainClass(AMainClass node) {
    classes.add(node.getId().getText());
  }
  
  @Override
  public void caseABaseclassClassDecl(ABaseclassClassDecl node) {
    classes.add(node.getId().getText());
  }

  @Override
  public void caseAExtclassClassDecl(AExtclassClassDecl node) {
    classes.add(node.getClassid().getText());
  }

  public static void main(String[] args)
  {
    try
    {
      Reader reader;
      if ( args.length >= 1 )
        reader = new FileReader(args[0]);
      else
        reader = new InputStreamReader(System.in);
      // create lexer, parser, and abstract syntax tree
      Lexer lexer = new Lexer(new PushbackReader(new BufferedReader(reader),
                                                 1024));
      Parser parser = new Parser(lexer);
      Start ast = parser.parse();
      reader.close();
      // visit parse tree
      ClassLister visitor = new ClassLister();
      ast.apply(visitor);
      for(String c: visitor.classNames())
        System.out.println(c);
    }
    catch (Exception e)
    {
      System.out.println(e);
      // in a production system, would call something like System.exit(1);
    }
  }
}