Example #1
0
  public GeoElement[] processExpressionNode(ExpressionNode n) throws MyError {
    // command is leaf: process command
    if (n.isLeaf()) {
      ExpressionValue leaf = n.getLeft();
      if (leaf instanceof Command) {
        Command c = (Command) leaf;
        c.setLabels(n.getLabels());
        return cmdDispatcher.processCommand(c, true);
      } else if (leaf instanceof Equation) {
        Equation eqn = (Equation) leaf;
        eqn.setLabels(n.getLabels());
        return processEquation(eqn);
      } else if (leaf instanceof Function) {
        Function fun = (Function) leaf;
        fun.setLabels(n.getLabels());
        return processFunction(n, fun);
      } else if (leaf instanceof FunctionNVar) {
        FunctionNVar fun = (FunctionNVar) leaf;
        fun.setLabels(n.getLabels());
        return processFunctionNVar(n, fun);
      }
    }

    // ELSE:  resolve variables and evaluate expressionnode
    n.resolveVariables();
    eval = n.evaluate();
    boolean dollarLabelFound = false;

    ExpressionNode myNode = n;
    if (myNode.isLeaf()) myNode = myNode.getLeftTree();
    // leaf (no new label specified): just return the existing GeoElement
    if (eval.isGeoElement()
        && n.getLabel() == null
        && !(n.operation.equals(Operation.ELEMENT_OF))) {
      // take care of spreadsheet $ names: don't loose the wrapper ExpressionNode here
      // check if we have a Variable
      switch (myNode.getOperation()) {
        case $VAR_COL:
        case $VAR_ROW:
        case $VAR_ROW_COL:
          // don't do anything here: we need to keep the wrapper ExpressionNode
          // and must not return the GeoElement here
          dollarLabelFound = true;
          break;

        default:
          // return the GeoElement
          GeoElement[] ret = {(GeoElement) eval};
          return ret;
      }
    }

    if (eval.isBooleanValue()) return processBoolean(n, eval);
    else if (eval.isNumberValue()) return processNumber(n, eval);
    else if (eval.isVectorValue()) return processPointVector(n, eval);
    else if (eval.isVector3DValue()) return processPointVector3D(n, eval);
    else if (eval.isTextValue()) return processText(n, eval);
    else if (eval instanceof MyList) {
      return processList(n, (MyList) eval);
    } else if (eval instanceof Function) {
      return processFunction(n, (Function) eval);
    } else if (eval instanceof FunctionNVar) {

      return processFunctionNVar(n, (FunctionNVar) eval);
    }
    // we have to process list in case list=matrix1(1), but not when list=list2
    else if (eval instanceof GeoList && myNode.hasOperations()) {
      Application.debug("should work");
      return processList(n, ((GeoList) eval).getMyList());
    } else if (eval.isGeoElement()) {

      // e.g. B1 = A1 where A1 is a GeoElement and B1 does not exist yet
      // create a copy of A1
      if (n.getLabel() != null || dollarLabelFound) {
        return processGeoCopy(n.getLabel(), n);
      }
    }

    // REMOVED due to issue 131: http://code.google.com/p/geogebra/issues/detail?id=131
    //		// expressions like 2 a (where a:x + y = 1)
    //		// A1=b doesn't work for these objects
    //		else if (eval instanceof GeoLine) {
    //			if (((GeoLine)eval).getParentAlgorithm() instanceof AlgoDependentLine) {
    //				GeoElement[] ret = {(GeoElement) eval };
    //				return ret;
    //			}
    //
    //		}

    // if we get here, nothing worked
    Application.debug("Unhandled ExpressionNode: " + eval + ", " + eval.getClass());
    return null;
  }