treebuild.java

wekaUT是 university texas austin 开发的基于weka的半指导学习(semi supervised learning)的分类器

    m_st.ordinaryChar('/');
    m_st.ordinaryChar('*');
    m_st.quoteChar('"');
    m_st.whitespaceChars(';',';');
    m_st.ordinaryChar('=');
  }

  /**
   * This is the alternative syntax for the tokenizer.
   */
  private void alterSyntax() {
    m_st.resetSyntax();
    m_st.wordChars('\u0000', '\u00ff');
    m_st.slashStarComments(false);
    m_st.slashSlashComments(false);
    m_st.ordinaryChar('\n');
    m_st.ordinaryChar('\r');
  }

  /**
   * This will parse the next token out of the stream and check for certain 
   * conditions.
   *
   * @param r The error string to print out if something goes wrong.
   */
  private void nextToken(String r) {
    int t = 0;
    try {
      t = m_st.nextToken();
    } catch(IOException e) {
    }
    
    if (t == m_st.TT_EOF) {
      System.out.println("eof , " + r);
    }
    else if (t == m_st.TT_NUMBER) {
      System.out.println("got a number , " + r);
    }
  }
  
  /**
   * Parses the top of the dotty stream that has the graph information.
   *
   */
  private void graph() {
    boolean flag = true;
    String s;
    //expect digraph
    int t;
    nextToken("expected 'digraph'");
    
    if (m_st.sval.equalsIgnoreCase("digraph")) {
      m_digraph = true;
    }
    else {
      System.out.println("expected 'digraph'");
    }
    
    nextToken("expected a Graph Name");
    if (m_st.sval != null) {
      m_graphName = m_st.sval;
    }
    else {
      System.out.println("expected a Graph Name");
    }
    
    nextToken("expected '{'");
    
    if (m_st.ttype == '{') {
      stmtList();
    }
    else {
      System.out.println("expected '{'");
    }
  }

  /**
   * This is one of the states, this one is where new items can be defined 
   * or the structure can end.
   *
   */
  private void stmtList() {
    boolean flag = true;
    String s;
    int t;
    while(flag) {
      nextToken("expects a STMT_LIST item or '}'");
      if (m_st.ttype == '}') {
	flag = false;
      }
      else if (m_st.sval.equalsIgnoreCase("graph") ||
	       m_st.sval.equalsIgnoreCase("node") ||
	       m_st.sval.equalsIgnoreCase("edge")) {
	m_st.pushBack();
	attrStmt();
      }
      else if (m_st.sval != null) {
	nodeId(m_st.sval,0);
      }
      else {
	System.out.println("expects a STMT_LIST item or '}'");
      }
    }
  }

  /**
   * This will deal specifically with a new object such as graph , node , edge.
   *
   */
  private void attrStmt() {
    
    nextToken("expected 'graph' or 'node' or 'edge'");
    
    if (m_st.sval.equalsIgnoreCase("graph")) {
      nextToken("expected a '['");
      if (m_st.ttype == '[') {
	attrList(m_grObj);
      }
      else {
	System.out.println("expected a '['");
      }
    }
    else if (m_st.sval.equalsIgnoreCase("node")) {
      nextToken("expected a '['");
      if (m_st.ttype == '[') {
	attrList(m_noObj);
      }
      else {
	System.out.println("expected a '['");
      }
    }
    else if (m_st.sval.equalsIgnoreCase("edge")) {
      nextToken("expected a '['");
      if (m_st.ttype == '[') {
	attrList(m_edObj);
      }
      else {
	System.out.println("expected a '['");
      }
      
    }
    else {
      System.out.println("expected 'graph' or 'node' or 'edge'"); 
    }
  }

  /**
   * Generates a new InfoObject with the specified name and either does 
   * further processing if applicable
   * Otherwise it is an edge and will deal with that.
   *
   * @param s The ID string.
   * @param t Not sure!.
   */
  private void nodeId(String s,int t) {
    
    nextToken("error occurred in node_id");

    if (m_st.ttype == '}') {
      //creates a node if t is zero
      if (t == 0) {
	m_nodes.addElement(new InfoObject(s));
      }
      m_st.pushBack();
    }
    else if (m_st.ttype == '-') {
      nextToken("error occurred checking for an edge");
      if (m_st.ttype == '>') {
	edgeStmt(s);
      }
      else {
	System.out.println("error occurred checking for an edge");
      }
    }
    else if (m_st.ttype == '[') {
      //creates a node if t is zero and sends it to attr
      if (t == 0) {
	m_nodes.addElement(new InfoObject(s));
	attrList((InfoObject)m_nodes.lastElement());
      }
      else {
	attrList((InfoObject)m_edges.lastElement());
      }
    }
    else if (m_st.sval != null) {
      //creates a node if t is zero
      if (t == 0) {
	m_nodes.addElement(new InfoObject(s));
      }
      m_st.pushBack();
    }
    else {
      System.out.println("error occurred in node_id");
    }
  }

  /**
   * This will get the target of the edge.
   *
   * @param i The source of the edge.
   */
  private void edgeStmt(String i) {
    nextToken("error getting target of edge");
    
    if (m_st.sval != null) {
      m_edges.addElement(new InfoObject("an edge ,no id"));
      ((InfoObject)m_edges.lastElement()).m_source = i;
      ((InfoObject)m_edges.lastElement()).m_target = m_st.sval;
      nodeId(m_st.sval,1);
    }
    else {
      System.out.println("error getting target of edge");
    }
  }

  /**
   * This will parse all the items in the attrib list for an object.
   *
   * @param a The object that the attribs apply to.
   */
  private void attrList(InfoObject a) {
    boolean flag = true;
    
    while (flag) {
      nextToken("error in attr_list");
      //System.out.println(st.sval);
      if (m_st.ttype == ']') {
	flag = false;
      }
      else if (m_st.sval.equalsIgnoreCase("color")) {
	nextToken("error getting color");
	if (m_st.ttype == '=') {
	  nextToken("error getting color");
	  if (m_st.sval != null) {
	    a.m_color = m_st.sval;
	  }
	  else {
	    System.out.println("error getting color");
	  }
	}
	else {
	  System.out.println("error getting color");
	}
      }
      else if (m_st.sval.equalsIgnoreCase("fontcolor")) {
	nextToken("error getting font color");
	if (m_st.ttype == '=') {
	  nextToken("error getting font color");
	  if (m_st.sval != null) {
	    a.m_fontColor = m_st.sval;
	  }
	  else {
	    System.out.println("error getting font color");
	  }
	}
	else {
	  System.out.println("error getting font color");
	}
      }
      else if (m_st.sval.equalsIgnoreCase("fontsize")) {
	nextToken("error getting font size");
	if (m_st.ttype == '=') {
	  nextToken("error getting font size");
	  if (m_st.sval != null) {
	    a.m_fontSize = m_st.sval;
	  }
	  else {
	    System.out.println("error getting font size");
	  }
	}
	else {
	  System.out.println("error getting font size");
	}
      }
      else if (m_st.sval.equalsIgnoreCase("label")) {
	nextToken("error getting label");
	if (m_st.ttype == '=') {
	  nextToken("error getting label");
	  if (m_st.sval != null) {
	    a.m_label = m_st.sval;
	  }
	  else {
	    System.out.println("error getting label");
	  }
	}
	else {
	  System.out.println("error getting label");
	}
      }
      else if (m_st.sval.equalsIgnoreCase("shape")) {
	nextToken("error getting shape");
	if (m_st.ttype == '=') {
	  nextToken("error getting shape");
	  if (m_st.sval != null) {
	    a.m_shape = m_st.sval;
	  }
	  else {
	    System.out.println("error getting shape");
	  }
	}
	else {
	  System.out.println("error getting shape");
	}
      }
      else if (m_st.sval.equalsIgnoreCase("style")) {
	nextToken("error getting style");
	if (m_st.ttype == '=') {
	  nextToken("error getting style");
	  if (m_st.sval != null) {
	    a.m_style = m_st.sval;
	  }
	  else {
	    System.out.println("error getting style");
	  }
	}
	else {
	  System.out.println("error getting style");
	}
      }
      else if (m_st.sval.equalsIgnoreCase("data")) {
	nextToken("error getting data");
	if (m_st.ttype == '=') {
	  //data has a special data string that can have anything
	  //this is delimited by a single comma on an otherwise empty line
	  alterSyntax();
	  a.m_data = new String("");
	  
	  while (true) {
	    nextToken("error getting data");
	    if (m_st.sval != null && a.m_data 
		!= null && m_st.sval.equals(",")) {
	      break;
	    }
	    else if (m_st.sval != null) {
	      a.m_data = a.m_data.concat(m_st.sval);
	    }
	    else if (m_st.ttype == '\r') {
	      a.m_data = a.m_data.concat("\r");
	    }
	    else if (m_st.ttype == '\n') {
	      a.m_data = a.m_data.concat("\n");
	    }
	    else {
	      System.out.println("error getting data");
	    }
	  }
	  setSyntax();
	}
	else {
	  System.out.println("error getting data");
	}
      }
    }
  }

  //special class for use in creating the tree

  /**
   * This is an internal class used to keep track of the info for the objects 
   * before they are 
   * actually created.
   */
  private class InfoObject {
    /** The ID string for th object. */
    public String m_id;

    /** The color name for the object. */
    public String m_color;

    /** The font color for the object. not in use. */
    public String m_fontColor;

    /** The fontsize for the object. not in use. */
    public String m_fontSize;

    /** The label for the object. */
    public String m_label;

    /** The shape name of for the object. */
    public String m_shape;

    /** The backstyle name for the object. */
    public String m_style;

    /** The source ID of the object. */
    public String m_source;

    /** The target ID of the object. */
    public String m_target;

    /** The data for this object. */
    public String m_data;

    /**
     * This will construct a new InfoObject with the specified ID string.
     */
    public InfoObject(String i) {
      m_id = i;
      m_color = null;
      m_fontColor = null;
      m_fontSize = null;
      m_label = null;
      m_shape = null;
      m_style = null;
      m_source = null;
      m_target = null;
      m_data = null;
    }
  }
}