private Expression GetSwitchConstant(DeserializerTypeContext ctx, MemberNode node)
{
if (ctx.HashingMethod == null) return Expression.Constant(node.Member.Name);
var hash = ctx.HashingMethod.Values.FirstOrDefault(kv => kv.Value == node.Member.Name);
if (hash.Value == null) throw new InvalidOperationException("Unknown hash for member " + node.Member);
return Expression.Constant(hash.Key);
}
private SwitchCase ProcessCollectionNode(DeserializerTypeContext ctx, MemberNode node, MethodInfo method)
{
var bodyExpressions = new List<Expression>();
var collectionType = GetNewCollectionType(node.Member.PropertyOrFieldType);
method = method.MakeGenericMethod(collectionType);
var createNewCollection = Expression.New(collectionType);
var callExtractItems = Expression.Call(null, method, ctx.IteratorVar, ctx.StringParam, createNewCollection);
var accessMember = Expression.MakeMemberAccess(ctx.InstanceVar, node.Member);
if (node.Member.PropertyOrFieldType.IsArray)
{
var callToArray = Expression.Call(null, _toArray.MakeGenericMethod(node.Member.PropertyOrFieldType.GetElementType()), callExtractItems);
callExtractItems = callToArray;
}
var assignMember = Expression.Assign(accessMember, callExtractItems);
bodyExpressions.Add(assignMember);
bodyExpressions.Add(Expression.Empty());
var body = Expression.Block(bodyExpressions);
var @case = Expression.SwitchCase(body, GetSwitchConstant(ctx, node));
return @case;
}
private SwitchCase GetKnownTypeSwitchCase(DeserializerTypeContext ctx, MethodInfo method, MemberNode node)
{
var bodyExpressions = new List<Expression>();
var callExtractString = Expression.Call(null, method, ctx.IteratorVar, ctx.StringParam);
var accessMember = Expression.MakeMemberAccess(ctx.InstanceVar, node.Member);
var assignMember = Expression.Assign(accessMember, callExtractString);
bodyExpressions.Add(assignMember);
bodyExpressions.Add(Expression.Empty());
var body = Expression.Block(bodyExpressions);
var @case = Expression.SwitchCase(body, GetSwitchConstant(ctx, node));
return @case;
}
