/*  SCCS - @(#)Patch.java	1.1 - 06/05/00 - 14:15:08 */

/*
 * Copyright (c) 1997 USC Brain Project. email nsl@java.usc.edu.
*/

package patch.src.util;

import java.io.*;
import java.util.*;
import patch.src.*;
import pp.src.jbf.*;


public class Patch {


  public Patch () {
    // class_var_scope = cur_var_scope = new Vector(); 
    cur_var_scope = new Vector(); 
    var_scope = new Stack();
    // wholebuffer = null;
  }

  /**
    Declare new class of the current file
    */
  public void startClass(YYtoken curC, YYtoken bClass) throws FileNotFoundException {
    // Parse the base Class first and push the var in higher scope

    String curClass = cur_class = curC.text;
    FileInputStream fin = new FileInputStream(bClass.text+".tmp");

    yybl = new YYlex(fin);
    yybp = new YYparse(yybl);
    
    try {
        yybl.init(this);
        yybp.init(this);
        yybp.yyparse();
    } catch (Exception e) {
	System.err.println("!!! exception detected:" + e.getMessage());
        e.printStackTrace();
        System.err.println(cur_class);
        System.err.println("*** CAN NOT PARSE TMP FILE ! *** \n");
        System.exit(0);
    } 
    
    cur_class = curClass;
    pushScope();
  }

  public void endClass() { // Just prints out the variables in scope
    Stack tmp_stack;
    Vector scope;
    Enumeration E = cur_var_scope.elements();
    FormalNode ttmp;

    // scan the current scope
    while (E.hasMoreElements()) {
      ttmp = (FormalNode)E.nextElement();
      System.err.println(ttmp.code0);
      // System.err.println(ttmp.type.text);
    }

    // scan outer scope
    tmp_stack = new Stack();
    while (!var_scope.empty()) {
      E = ((Vector)var_scope.peek()).elements();

      while (E.hasMoreElements()) {
        ttmp = (FormalNode)E.nextElement();
        System.err.println(ttmp.code0);
        // System.err.println(ttmp.type.text);
      }
      // not found in this scope
      tmp_stack.push(var_scope.pop());
    }
    // not found any scope
    restoreScope(tmp_stack);


  }

  public void addLocalVar(FormalNode n) {
    //System.out.println("Add variable "+n.text);
    cur_var_scope.addElement(n);
  }

  private void restoreScope(Stack tmp) {
    try {
      while(!tmp.empty()) {
	var_scope.push(tmp.pop());
      }
    } catch (EmptyStackException e) {
      System.err.println("System internal error: Patch");
      throw e;
    }
  }
 

  public void pushScope() {
    if(cur_var_scope!=null)
      var_scope.push(cur_var_scope);
    cur_var_scope = new Vector(10,10);
    //System.out.println("Push ........................................");
  }

  public void popScope() {
    try {
      cur_var_scope.removeAllElements();
      cur_var_scope = (Vector) var_scope.pop();
      //System.out.println("Pull ........................................");
    }
    catch(EmptyStackException e) {
      System.err.println("Patch.java: pop empty scope at popScope()");
      throw e;
    }
  }

  Vector cur_var_scope;
  Stack var_scope;
  public String cur_class;

  YYlex yybl;
  YYparse yybp;

  public void genCode() { // printout the var stack
  }
}