public virtual Expression Apply(ITransform transform)
{
IEnumerable <TransformSchemaPair> transforms;
if (flatten && schema.HasBase)
{
// collect transform/schema pairs for all the bases
var flatteningParser = new FlatteningParser(Schema);
flatteningParser.Apply(transform);
transforms = flatteningParser.Transforms;
}
else
{
transforms = new[] { new TransformSchemaPair(transform, Schema) };
}
var state = Expression.Variable(typeof(byte), "state");
var requiredFields = RequiredFields.Variable("requiredFields");
var requiredFieldNames = GetRequiredFieldNames();
var stateMachine = CreateStateMachine(transforms, requiredFields);
return(Expression.Block(
new[] { state, requiredFields },
transform.Begin,
RequiredFields.Init(requiredFields, requiredFieldNames.Count),
Expression.Assign(state, Expression.Constant(stateMachine.InitialState)),
ControlExpression.While(
Expression.AndAlso(
Expression.Not(EOF),
Expression.NotEqual(state, Expression.Constant(stateMachine.FinalState))),
SwitchToken(stateMachine, state),
Expression.Label("endStateMachineLoop")),
VerifyRequiredFields(requiredFields, requiredFieldNames),
transform.End));
}