jtreeastmodel.java

Java写的词法/语法分析器。可生成JAVA语言或者是C++的词法和语法分析器。并可产生语法分析树和对该树进行遍历

package antlr.debug.misc;

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/RIGHTS.html
 *
 * $Id: //depot/code/org.antlr/release/antlr-2.7.0/antlr/debug/misc/JTreeASTModel.java#1 $
 */

import antlr.collections.AST;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;

public class JTreeASTModel implements TreeModel {

  AST root = null;

  public JTreeASTModel(AST t) {
	if (t == null) {
	  throw new IllegalArgumentException("root is null");
	}
	root = t;
  }  
  public void addTreeModelListener(TreeModelListener l) {
  }  
  public Object getChild(Object parent, int index) {
	if (parent == null) {
	  return null;
	}
	AST p = (AST)parent;
	AST c = p.getFirstChild();
	if ( c==null ) {
	  throw new ArrayIndexOutOfBoundsException("node has no children");
	}
	int i = 0;
	while ( c!=null && i<index ) {
	  c = c.getNextSibling();
	  i++;
	}
	return c;
  }  
  public int getChildCount(Object parent) {
	if ( parent==null ) {
	  throw new IllegalArgumentException("root is null");
	}
	AST p = (AST)parent;
	AST c = p.getFirstChild();
	int i = 0;
	while ( c!=null ) {
	  c = c.getNextSibling();
	  i++;
	}
	return i;
  }  
  public int getIndexOfChild(Object parent, Object child) {
	if ( parent==null || child==null ) {
	  throw new IllegalArgumentException("root or child is null");
	}
	AST p = (AST)parent;
	AST c = p.getFirstChild();
	if ( c==null ) {
	  throw new ArrayIndexOutOfBoundsException("node has no children");
	}
	int i = 0;
	while ( c!=null && c!=child ) {
	  c = c.getNextSibling();
	  i++;
	}
	if ( c==child ) {
	  return i;
	}
	throw new java.util.NoSuchElementException("node is not a child");
  }  
  public Object getRoot() {
	return root;
  }  
  public boolean isLeaf(Object node) {
	if ( node == null ) {
	  throw new IllegalArgumentException("node is null");
	}
	AST t = (AST)node;
	return t.getFirstChild()==null;
  }  
  public void removeTreeModelListener(TreeModelListener l) {
  }  
  public void valueForPathChanged(TreePath path, Object newValue) {
	System.out.println("heh, who is calling this mystery method?");
  }  
}