/*
 * Simple front-end for an ANTLR lexer/parser that dumps the AST
 * textually and displays it graphically.  Good for debugging AST
 * construction rules.
 *
 * Behrooz Badii, Miguel Maldonado, and Stephen A. Edwards
 */

import java.io.*;
import antlr.CommonAST;
import antlr.collections.AST;
import antlr.debug.misc.ASTFrame;

public class Main {
  public static void main(String args[]) {
    try {
      DataInputStream input = new DataInputStream(System.in);

      // Create the lexer and parser and feed them the input
      SimpLexer lexer = new SimpLexer(input); 
      SimpParser parser = new SimpParser(lexer);
      parser.file(); // "file" is the main rule in the parser

      // Get the AST from the parser
      CommonAST parseTree = (CommonAST)parser.getAST();

      // Print the AST in a human-readable format
      System.out.println(parseTree.toStringList());

      // Open a window in which the AST is displayed graphically
      ASTFrame frame = new ASTFrame("AST from the Simp parser", parseTree);
      frame.setVisible(true);

    } catch(Exception e) { System.err.println("Exception: "+e); }
  }
}