private Expression Build(IcaseFunctionNode node)
{
Expression ifFalseExpr = Expression.Convert(InnerBuild(node.ElseResultNode), typeof(object));
Expression conditionExpr = null;
foreach (var caseConditionNode in node.CaseConditionNodes.Reverse())
{
var conditionNode = InnerBuild(caseConditionNode.ConditionNode);
if (conditionNode.NodeType == ExpressionType.Constant && ((ConstantExpression)conditionNode).Value == null)
{
return(Expression.Constant(null));
}
var testExpr = Expression.Convert(conditionNode, typeof(bool));
var ifTrueExpr = Expression.Convert(InnerBuild(caseConditionNode.ResultNode), typeof(object));
conditionExpr = Expression.Condition(testExpr, ifTrueExpr, ifFalseExpr, typeof(object));
ifFalseExpr = conditionExpr;
}
return(conditionExpr);
}
//TODO: implement with CSharpExpressionHelperMethodResolver in order to get auto type conversion
private Type Build(IcaseFunctionNode node)
{
// just picked one argument. I'm assuming the others are going to be the same.
return(InnerBuild(node.CaseConditionNodes.First().ResultNode));
}
