waveform.java

一种将c高级语言转化给VHDL的编译器

/*
 *
 LA-CC 05-135 Trident 0.7.1

Copyright Notice
Copyright 2006 (c) the Regents of the University of California.

This Software was produced under a U.S. Government contract
(W-7405-ENG-36) by Los Alamos National Laboratory, which is operated
by the University of California for the U.S. Department of Energy. The
U.S. Government is licensed to use, reproduce, and distribute this
Software. Permission is granted to the public to copy and use this
Software without charge, provided that this Notice and any statement
of authorship are reproduced on all copies. Neither the Government nor
the University makes any warranty, express or implied, or assumes any
liability or responsibility for the user of this Software.


*/

package fp.util.vhdl.generator;

import java.util.*;

public class Waveform implements VHDLout {

  // this should have several waveform_elemnts, but not yet.

  // these should be more than expressions:
  // expression [ after time_expression ]
  // null [after time_expression ]
  LinkedList expressions;

  public Waveform(Object exp1, Object exp2) {
    expressions = new LinkedList();
    if (exp1 != null) {
      if (exp2 != null) {
	addExpression(exp1, exp2);
      } else {
	addExpression(exp1);
      }
    }
  }

  public Waveform(Object exp) {
    this(exp,null);
  }

  void addExpression(Object exp) {
    addWaveformElement(new WaveformElement(new Expression(exp), null)); 
  }
  
  void addExpression(Object exp1, Object exp2) {
    addWaveformElement(new WaveformElement(new Expression(exp1), 
					   new Expression(exp2)));
  }

  void addWaveformElement(WaveformElement we) {
    expressions.add(we);
  }


  public StringBuffer toVHDL(StringBuffer s, String pre) {
    s.append(pre);
    int count = 0;
    for(ListIterator list_iter = expressions.listIterator(); 
	list_iter.hasNext(); ) {
      if (count != 0) {
	s.append(", ");
      }
      ((VHDLout)list_iter.next()).toVHDL(s,"");
    }
    return s;
  }
  
  public String toString() {
    return toVHDL(new StringBuffer(), "").toString();
  }


  public static void main(String args[]) {
    Waveform wf = new Waveform(new SimpleName("Bob"));
    System.out.println("Waveform: "+wf);
    
  }

   
}