internal DataExpression(DataTable table, string expression, Type type)
{
ExpressionParser parser = new ExpressionParser(table);
parser.LoadExpression(expression);
_originalExpression = expression;
_expr = null;
if (expression != null)
{
_storageType = DataStorage.GetStorageType(type);
if (_storageType == StorageType.BigInteger)
{
throw ExprException.UnsupportedDataType(type);
}
_dataType = type;
_expr = parser.Parse();
_parsed = true;
if (_expr != null && table != null)
{
Bind(table);
}
else
{
_bound = false;
}
}
}
internal DataExpression(DataTable table, string expression, Type type)
{
this.dependency = DataTable.zeroColumns;
ExpressionParser parser = new ExpressionParser(table);
parser.LoadExpression(expression);
this.originalExpression = expression;
this.expr = null;
if (expression != null)
{
this._storageType = DataStorage.GetStorageType(type);
if (this._storageType == StorageType.BigInteger)
{
throw ExprException.UnsupportedDataType(type);
}
this._dataType = type;
this.expr = parser.Parse();
this.parsed = true;
if ((this.expr != null) && (table != null))
{
this.Bind(table);
}
else
{
this.bound = false;
}
}
}
internal virtual void CheckExpression(string expression)
{
ExpressionParser parser = new ExpressionParser();
parser.LoadExpression(expression);
expr = null;
parsed = false;
bound = false;
originalExpression = expression;
optimizedExpression = null;
if (expression != null)
{
expr = parser.Parse();
parsed = true;
bound = false;
}
if (expr != null)
{
this.Bind(table);
}
}
private double slope(double x0, double y0)
{
// Instantiate the parser
ExpressionParser parser = new ExpressionParser();
// Create a hashtable to hold values
Hashtable h = new Hashtable();
// Add variables and values to hashtable
h.Add("x", x0.ToString());
h.Add("y", x0.ToString());
h.Add("t", y0.ToString());
h.Add("c", 0);
h.Add("c1", 0);
h.Add("c2", 0);
// Parse and write the result
string tempFunction = grSettings.FunctionA;
double result = parser.Parse(tempFunction, h);
return result;
}
private double parametricfunction(string _function, double t0)
{
// Instantiate the parser
ExpressionParser parser = new ExpressionParser();
// Create a hashtable to hold values
Hashtable h = new Hashtable();
// Add variables and values to hashtable
h.Add("t", t0.ToString());
h.Add("x", 0);
h.Add("c", 0);
h.Add("c1", 0);
h.Add("c2", 0);
// Parse and write the result
string tempFunction = _function;
double result = parser.Parse(tempFunction, h);
return result;
}
