package nzdis.lang.fipaacl;

/**/
import nzdis.lang.fipaacl.analysis.DepthFirstAdapter;
import nzdis.lang.fipaacl.node.*;

/**
 * Simple ACL AST walker. This is simple Abstract Syntax Tree walker
 * which will visit each of the nodes and print on standard output the
 * well formed ASCII representation.
 *
 *@author Mariusz Nowostawski
 *@version @version@ $Revision: 1.1 $
 */
class Ast2AsciiWalker extends DepthFirstAdapter {

  int indent = 0;
  int tabSize = 2;
  StringBuffer result = new StringBuffer();
  boolean spaceNeeded = false;
  int indentNeeded = 0;
  
  public String toString(){
    return result.toString();
  }

  void newLine(){
    indent = tabSize;
    result.append("\n").append("  ");
    spaceNeeded = false;
  }

  void indent(){
    indent += tabSize;
    String s = "";
    for(int i=0; i < indent; i++) s += " "; 
    result.append("\n").append(s);
    spaceNeeded = false;
  }
    
  public void defaultIn(Node node) {
  }
  public void defaultOut(Node node) {
  }  
  public void defaultCase(Node node) {
  }

  public void inAMessage(AMessage node){
    result.append("(").append(node.getIdentifier().getText());
  }

  public void outAMessage(AMessage node){
    result.append("\n)");
  }  

  public void inAParameter(AParameter node){
    newLine();
    result.append(":").append(node.getIdentifier().getText()).append(" ");
  }

  public void inAComplexContent(AComplexContent node){
    if(indentNeeded > 0) {
      indent();
    } else {
      indent += 10;
    }
    result.append("(");
    indentNeeded++;
    spaceNeeded = false;
  }

  public void outAComplexContent(AComplexContent node){
    result.append(")");
    indentNeeded--;
    indent -= tabSize;
    spaceNeeded = false;
  }

  public void inAIdentifierContent(AIdentifierContent node){
    if(spaceNeeded) {
      result.append(" ");
    }
    result.append(node.getIdentifier().getText());
    spaceNeeded = true;
  }

  public void inAExprContent(AExprContent node){
    if(spaceNeeded) {
      result.append(" ");
    }
    result.append(node.getLiteral().getText());
    spaceNeeded = true;
  }

  public void inAPropertyContent(APropertyContent node){
    if(spaceNeeded) {
      result.append(" ");
    }
    result.append(":").append(node.getIdentifier().getText());
    spaceNeeded = true;
  }

  public void inAStringContent(AStringContent node){
    if(spaceNeeded) {
      result.append(" ");
    }
    result.append(node.getString().getText());
    spaceNeeded = true;
  }

}