@NA returns false for isError()

src/com/bytezone/diskbrowser/visicalc/Cell.java

@@ -112,10 +112,6 @@ class Cell implements Comparable<Cell>, Value
 
   String getText (int colWidth, char defaultFormat)
   {
-    // cell may have been created when formatted but no type set
-    //    if (type == null)
-    //      return justify ("", colWidth);
-
     switch (type)
     {
       case LABEL:
@@ -192,14 +188,14 @@ class Cell implements Comparable<Cell>, Value
   @Override
   public String getText ()
   {
-    assert type == CellType.VALUE : "Cell type: " + type;
+    assert isValue () : "Cell type: " + type;
     return value.getText ();
   }
 
   @Override
   public boolean isError ()
   {
-    assert type == CellType.VALUE : "Cell type: " + type;
+    assert isValue () : "Cell type: " + type;
     return value.isError ();
   }
 
@@ -235,8 +231,8 @@ class Cell implements Comparable<Cell>, Value
   @Override
   public String toString ()
   {
-    String contents = "<empty>";
+    String contents = "";
-    if (type != null)
+
     switch (type)
     {
       case LABEL:

src/com/bytezone/diskbrowser/visicalc/Condition.java

@@ -45,14 +45,20 @@ class Condition
 
   public boolean getResult ()
   {
+    //    System.out.println (conditionText);
     if (conditionExpression == null)
     {
+      //      System.out.printf ("creating %s%n", conditionText);
       conditionExpression = new Expression (parent, conditionText);
+      //      System.out.printf ("creating %s%n", valueText);
       valueExpression = new Expression (parent, valueText);
 
+      //      System.out.printf ("calculating %s%n", conditionExpression);
       conditionExpression.calculate ();
+      //      System.out.printf ("calculating %s%n", valueExpression);
       valueExpression.calculate ();
     }
+    //    System.out.println ("after calculation");
 
     if (conditionExpression.isError () || valueExpression.isError ())
       return false;

src/com/bytezone/diskbrowser/visicalc/Expression.java

@@ -32,12 +32,13 @@ class Expression implements Value
   private final List<String> operators = new ArrayList<String> ();
   private final List<String> signs = new ArrayList<String> ();
 
-  //  protected boolean isError;
   private ValueType valueType;
   private double value;
+  private String text;
 
   public Expression (Sheet parent, String text)
   {
+    this.text = text;
     String line = checkBrackets (text);
     //    System.out.printf ("Exp[%s]%n", line);
 
@@ -121,7 +122,10 @@ class Expression implements Value
   @Override
   public Value calculate ()
   {
-    //    System.out.println (this);
+    //    System.out.printf ("Calculating: %s%n", text);
+    //    if (text.equals ("@NA"))
+    //      Utility.printStackTrace ();
+
     try
     {
       Value thisValue = values.get (0);
@@ -129,6 +133,7 @@ class Expression implements Value
       if (thisValue.isError ())
       {
         valueType = thisValue.getValueType ();
+        System.out.println ("error");
         return this;
       }
       value = thisValue.isNotAvailable () ? 0 : thisValue.getValue ();
@@ -144,6 +149,7 @@ class Expression implements Value
         if (thisValue.isError ())
         {
           valueType = thisValue.getValueType ();
+          System.out.println ("error");
           return this;
         }
 
@@ -171,6 +177,8 @@ class Expression implements Value
     {
       valueType = ValueType.ERROR;
     }
+
+    //    System.out.printf ("Result: %f%n", value);
     return this;
   }
 
@@ -292,25 +300,26 @@ class Expression implements Value
   @Override
   public String toString ()
   {
-    StringBuilder text = new StringBuilder ();
+    //    StringBuilder text = new StringBuilder ();
-
+    //
-    int ptr = 0;
+    //    int ptr = 0;
-    for (Value value : values)
+    //    for (Value value : values)
-    {
+    //    {
-      assert value != null;
+    //      assert value != null;
-      text.append (signs.get (ptr));
+    //      text.append (signs.get (ptr));
-      //      value.calculate ();
+    //      //      value.calculate ();
-      //      if (value.isValue ())
+    //      //      if (value.isValue ())
-      //        text.append (value.getValue ());
+    //      //        text.append (value.getValue ());
-      if (ptr < operators.size ())
+    //      if (ptr < operators.size ())
-      {
+    //      {
-        //        System.out.println (operators.get (ptr));
+    //        //        System.out.println (operators.get (ptr));
-        text.append (operators.get (ptr++));
+    //        text.append (operators.get (ptr++));
-      }
+    //      }
-    }
+    //    }
-    //    System.out.println ("finished building");
+    //    //    System.out.println ("finished building");
-
+    //
-    return text.toString ();
+    //    return text.toString ();
+    return "Expression: " + text;
   }
 
   public static void main (String[] args)

src/com/bytezone/diskbrowser/visicalc/Function.java

@@ -85,7 +85,9 @@ abstract class Function implements Value
       return new Error (parent, text);
 
     if (text.equals ("@NA"))
+    {
       return new Na (parent, text);
+    }
 
     System.out.printf ("Unknown function: [%s]%n", text);
     return new Error (parent, "@ERROR");
@@ -136,6 +138,7 @@ abstract class Function implements Value
   @Override
   public double getValue ()
   {
+    //    System.out.printf ("Getting value of : %s %s%n", functionName, functionText);
     assert valueType == ValueType.VALUE : "Function ValueType = " + valueType;
     return value;
   }

src/com/bytezone/diskbrowser/visicalc/If.java

@@ -29,11 +29,12 @@ class If extends Function
 
     if (condition.getResult ())
     {
+      //      System.out.println ("true");
       if (expTrue == null)
-      {
         expTrue = new Expression (parent, textTrue);
+
       expTrue.calculate ();
-      }
+
       if (expTrue.isError () || expTrue.isNotAvailable ())
         valueType = expTrue.getValueType ();
       else
@@ -41,16 +42,18 @@ class If extends Function
     }
     else
     {
+      //      System.out.println ("false");
       if (expFalse == null)
-      {
         expFalse = new Expression (parent, textFalse);
+
       expFalse.calculate ();
-      }
+
       if (expFalse.isError () || expFalse.isNotAvailable ())
         valueType = expFalse.getValueType ();
       else
         value = expFalse.getValue ();
     }
+
     return this;
   }
 

src/com/bytezone/diskbrowser/visicalc/IsError.java

@@ -2,21 +2,22 @@ package com.bytezone.diskbrowser.visicalc;
 
 class IsError extends Function
 {
-  Expression expression;
+  Cell cell;
 
   public IsError (Sheet parent, String text)
   {
     super (parent, text);
-    expression = new Expression (parent, functionText);
   }
 
   @Override
   public Value calculate ()
   {
-    expression.calculate ();
+    if (cell == null)
-    //    value = expression.getValue ();
+      cell = parent.getCell (functionText);
-    valueType = expression.getValueType ();
+
-    value = isError () ? 1 : 0;
+    value = cell == null ? 1 : 0;
+    valueType = ValueType.VALUE;
+
     return this;
   }
 }

src/com/bytezone/diskbrowser/visicalc/IsNa.java

@@ -7,12 +7,15 @@ public class IsNa extends Function
   IsNa (Sheet parent, String text)
   {
     super (parent, text);
-    expression = new Expression (parent, functionText);
   }
 
   @Override
   public Value calculate ()
   {
+    if (expression == null)
+      expression = new Expression (parent, functionText);
+
+    expression.calculate ();
     value = expression.getValue ();
     valueType = expression.getValueType ();
     return this;

src/com/bytezone/diskbrowser/visicalc/Lookup.java

@@ -14,20 +14,25 @@ class Lookup extends Function
     int pos = text.indexOf (',');
     sourceText = text.substring (8, pos);
     rangeText = text.substring (pos + 1, text.length () - 1);
-
-    source = new Expression (parent, sourceText);
-    range = getRange (rangeText);
   }
 
   @Override
   public Value calculate ()
   {
+    if (source == null)
+    {
+      source = new Expression (parent, sourceText);
+      range = getRange (rangeText);
+    }
+
     source.calculate ();
+    //    System.out.println ("calculated source");
     if (source.isError () || source.isNotAvailable ())
     {
       valueType = source.getValueType ();
       return this;
     }
+
     double sourceValue = source.getValue ();
 
     Address target = null;
@@ -40,10 +45,17 @@ class Lookup extends Function
     }
 
     if (target != null)
+    {
       if (range.isVertical ())
         value = parent.getCell (target.nextColumn ()).getValue ();
       else
         value = parent.getCell (target.nextRow ()).getValue ();
+      valueType = ValueType.VALUE;
+    }
+    else
+    {
+      System.out.println ("Target is null!");
+    }
 
     return this;
   }

src/com/bytezone/diskbrowser/visicalc/Na.java

@@ -10,7 +10,7 @@ public class Na extends Function
   @Override
   public boolean isError ()
   {
-    return true;
+    return false;
   }
 
   @Override

src/com/bytezone/diskbrowser/visicalc/Sheet.java

@@ -178,6 +178,7 @@ public class Sheet
   private void processLine (String line)
   {
     assert !line.isEmpty ();
+    //    System.out.println (line);
 
     if (line.startsWith ("/"))
     {