public FilterExpression Translate(Expression expression)
{
Visit(expression);
var expr = _filterExpressionParserStrategy.BuildExpression(_expression);
return(expr);
}
public FilterExpression BuildExpression(Stack <Token> stack)
{
if (stack == null)
{
throw new ArgumentNullException("stack", "Cannot build binary expression from null expression stack.");
}
if (stack.Count < 1)
{
throw new ArgumentException("Cannot build binary expression from empty expression stack.");
}
var token = stack.Pop();
if (token == null)
{
throw new ArgumentException("Cannot parse a null token.");
}
var op = token.Value;
var binaryOperator = op.GetFromODataQueryOperatorString();
if (binaryOperator.IsBinaryOperator() == false)
{
throw new ArgumentException(String.Format("Could not create binary expression with operator '{0}'. It is not a binary operator.", binaryOperator));
}
var right = _filterExpressionParserStrategy.BuildExpression(stack);
if (right == null)
{
throw new ArgumentException("Could not create binary expression with null right side.");
}
var left = _filterExpressionParserStrategy.BuildExpression(stack);
if (left == null)
{
throw new ArgumentException("Could not create binary expression with null left side.");
}
var result = FilterExpression.Binary(left, binaryOperator, right);
return(result);
}
public FilterExpression BuildExpression(Stack <Token> stack)
{
// pop off the member access operator ('.')
stack.Pop();
var token = stack.Pop();
var memberName = token.Value;
var memberParent = _filterExpressionParserStrategy.BuildExpression(stack);
var result = FilterExpression.MemberAccess(memberParent, memberName);
return(result);
}
public FilterExpression BuildExpression(Stack <Token> stack)
{
if (stack == null)
{
throw new ArgumentNullException("stack", "Cannot build function expression with a null expression stack.");
}
if (stack.Count < 1)
{
throw new ArgumentException("Cannot build function expression for function '{0}'. Not enough parameters.");
}
var token = stack.Pop();
if (token == null)
{
throw new ArgumentException("Cannot parse a null token.");
}
var function = token.Value.GetFromODataQueryMethodName();
var arity = function.Arity();
if (stack.Count < arity)
{
throw new ArgumentException(String.Format("Cannot build function expression for function '{0}'. Not enough parameters.", function));
}
var arguments = new List <FilterExpression>();
for (int i = 0; i < arity; i++)
{
var argument = _filterExpressionParserStrategy.BuildExpression(stack);
arguments.Add(argument);
}
arguments.Reverse();
var result = FilterExpression.MethodCall(function, arguments.ToArray());
return(result);
}
public FilterExpression BuildExpression(Stack <Token> stack)
{
if (stack == null)
{
throw new ArgumentNullException("stack", "Cannot build unary expression from null expression stack.");
}
if (stack.Count < 1)
{
throw new ArgumentException("Cannot build unary expression from empty expression stack.");
}
var token = stack.Pop();
if (token == null)
{
throw new ArgumentException("Cannot parse a null token.");
}
var op = token.Value;
var unaryOperator = op.GetFromODataQueryOperatorString();
if (unaryOperator.IsUnaryOperator() == false)
{
throw new ArgumentException(String.Format("Cannot build unary expression with operator '{0}'. It is not a unary operator.", unaryOperator));
}
var operand = _filterExpressionParserStrategy.BuildExpression(stack);
if (operand == null)
{
throw new ApplicationException("Cannot use a null operand when building a unary expression.");
}
var result = FilterExpression.Unary(unaryOperator, operand);
return(result);
}
public void BuildExpression_NullStack_ThrowsException()
{
Assert.That(() => _strategy.BuildExpression(null), Throws.InstanceOf <ArgumentNullException>());
}