/// <summary>
/// Interface implementaion. Returns string for 'Filter' or 'Segment' parameters of Google Analytics query by given lambda expression.
/// </summary>
/// <param name="expression">Lambda expression</param>
/// <returns>String for 'Filter' parameter for Google Analytics query</returns>
public string Parse(Expression <Predicate <ContextDataModel> > expression)
{
Parsers.IExpression rootExpression = getExpression(expression.Body);
string result = rootExpression.ParseToString();
return(result);
}
private Parsers.IExpression parseBinaryExpression(Expression expression)
{
Parsers.IExpression result = null;
BinaryExpression binaryExpression = expression as BinaryExpression;
if (binaryExpression != null)
{
var nodeType = binaryExpression.NodeType;
if (nodeType == ExpressionType.AndAlso || nodeType == ExpressionType.OrElse)
{
var conditionExpression = new Parsers.ConditionalExpression();
conditionExpression.Left = getExpression(binaryExpression.Left);
conditionExpression.Right = getExpression(binaryExpression.Right);
switch (nodeType)
{
case ExpressionType.AndAlso:
conditionExpression.Operator = Parsers.BooleanOperator.And;
break;
case ExpressionType.OrElse:
conditionExpression.Operator = Parsers.BooleanOperator.Or;
break;
}
result = conditionExpression;
}
else
{
Parsers.DataFieldExpression fieldExpression = null;
switch (nodeType)
{
case ExpressionType.Equal:
fieldExpression = createDataFieldExpression(Parsers.ConditionalOperator.Equals, binaryExpression);
break;
case ExpressionType.NotEqual:
fieldExpression = createDataFieldExpression(Parsers.ConditionalOperator.NotEquals, binaryExpression);
break;
case ExpressionType.LessThan:
fieldExpression = createDataFieldExpression(Parsers.ConditionalOperator.Less, binaryExpression);
break;
case ExpressionType.LessThanOrEqual:
fieldExpression = createDataFieldExpression(Parsers.ConditionalOperator.EqualsOrLess, binaryExpression);
break;
case ExpressionType.GreaterThan:
fieldExpression = createDataFieldExpression(Parsers.ConditionalOperator.Greater, binaryExpression);
break;
case ExpressionType.GreaterThanOrEqual:
fieldExpression = createDataFieldExpression(Parsers.ConditionalOperator.EqualsOrGereater, binaryExpression);
break;
}
result = fieldExpression;
}
}
return(result);
}
