/// <summary>
/// Attempts to resolve current node and sets either of the following fields:
/// _Field, _Method, _Property
///
/// The following fields are also set:
/// _Type, _Static
/// </summary>
private void resolveSelf(Context ctx)
{
Action check = () =>
{
if (Expression == null && !_IsStatic)
error(CompilerMessages.DynamicMemberFromStaticContext, _Type, MemberName);
if (_Method == null && TypeHints.Count > 0)
error(CompilerMessages.TypeArgumentsForNonMethod, _Type, MemberName);
};
_Type = StaticType != null
? ctx.ResolveType(StaticType)
: Expression.Resolve(ctx);
// special case: array length
if (_Type.IsArray && MemberName == "Length")
{
check();
return;
}
// check for field
try
{
_Field = ctx.ResolveField(_Type, MemberName);
_IsStatic = _Field.IsStatic;
check();
return;
}
catch (KeyNotFoundException) { }
// check for property
try
{
_Property = ctx.ResolveProperty(_Type, MemberName);
if(!_Property.CanGet)
error(CompilerMessages.PropertyNoGetter, _Type, MemberName);
_IsStatic = _Property.IsStatic;
check();
return;
}
catch (KeyNotFoundException) { }
// check for event: events are only allowed at the left side of += and -=
try
{
ctx.ResolveEvent(_Type, MemberName);
error(CompilerMessages.EventAsExpr);
}
catch (KeyNotFoundException) { }
// find method
var argTypes = TypeHints.Select(t => t.FullSignature == "_" ? null : ctx.ResolveType(t)).ToArray();
var methods = ctx.ResolveMethodGroup(_Type, MemberName).Where(m => checkMethodArgs(argTypes, m)).ToArray();
if (methods.Length == 0)
error(argTypes.Length == 0 ? CompilerMessages.TypeIdentifierNotFound : CompilerMessages.TypeMethodNotFound, _Type.Name, MemberName);
if (methods.Length > 1)
error(CompilerMessages.TypeMethodAmbiguous, _Type.Name, MemberName);
_Method = methods[0];
if (_Method.ArgumentTypes.Length > 16)
error(CompilerMessages.CallableTooManyArguments);
_IsStatic = _Method.IsStatic;
check();
}
/// <summary>
/// Attempts to expand the expression to an event (un)subscription.
/// </summary>
private NodeBase expandEvent(Context ctx, SetMemberNode node)
{
// incorrect operator
if (!_OperatorType.IsAnyOf(LexemType.Plus, LexemType.Minus))
return null;
var type = node.StaticType != null
? ctx.ResolveType(node.StaticType)
: node.Expression.Resolve(ctx);
try
{
var evt = ctx.ResolveEvent(type, node.MemberName);
// node.Value = Expr.CastTransparent(node.Value, evt.EventHandlerType);
return new EventNode(evt, node, _OperatorType == LexemType.Plus);
}
catch (KeyNotFoundException)
{
return null;
}
}