public Expression GetConditionOrNull(
IMemberMapperData mapperData,
CallbackPosition position,
QualifiedMember targetMember)
{
if (!HasCondition)
{
return(null);
}
var condition = _conditionLambda.GetBody(mapperData, position, targetMember);
if (_negateCondition)
{
condition = Expression.Not(condition);
}
var targetCanBeNull = position.IsPriorToObjectCreation(targetMember);
var conditionNestedAccessesChecks = mapperData
.GetExpressionInfoFor(condition, targetCanBeNull)
.NestedAccessChecks;
if (conditionNestedAccessesChecks != null)
{
condition = Expression.AndAlso(conditionNestedAccessesChecks, condition);
}
return(condition);
}
private static void ProcessMemberAccesses(
IMemberMapperData mapperData,
ref Expression value,
out Expression nestedAccessChecks,
out IList <ParameterExpression> variables)
{
var valueInfo = mapperData.GetExpressionInfoFor(value, targetCanBeNull: false);
nestedAccessChecks = valueInfo.NestedAccessChecks;
if (valueInfo.MultiInvocations.None())
{
variables = Enumerable <ParameterExpression> .EmptyArray;
return;
}
var numberOfInvocations = valueInfo.MultiInvocations.Count;
variables = new ParameterExpression[numberOfInvocations];
var cacheVariablesByValue = new Dictionary <Expression, Expression>(numberOfInvocations);
var valueExpressions = new Expression[numberOfInvocations + 1];
for (var i = 0; i < numberOfInvocations; i++)
{
var invocation = valueInfo.MultiInvocations[i];
var valueVariableName = invocation.Type.GetFriendlyName().ToCamelCase() + "Value";
var valueVariable = Expression.Variable(invocation.Type, valueVariableName);
var valueVariableValue = invocation.Replace(cacheVariablesByValue);
cacheVariablesByValue.Add(invocation, valueVariable);
variables[i] = valueVariable;
valueExpressions[i] = valueVariable.AssignTo(valueVariableValue);
}
valueExpressions[numberOfInvocations] = value.Replace(cacheVariablesByValue);
value = Expression.Block(valueExpressions);
}
