public EventNode(EventWrapper evt, SetMemberNode node, bool isSubscription)
{
_Event = evt;
_IsSubscription = isSubscription;
_Node = node;
_Callback = Expr.CastTransparent(node.Value, _Event.EventHandlerType);
}
/// <summary>
/// Expands short assignment to an expression member:
/// (expr).x += 1
/// or type::x += 1
/// </summary>
private NodeBase ExpandMember(Context ctx, SetMemberNode node)
{
// type::name += value
if (node.StaticType != null)
{
return(Expr.SetMember(
node.StaticType,
node.MemberName,
_assignmentOperator(
Expr.GetMember(
node.StaticType,
node.MemberName
),
node.Value
)
));
}
// simple case: no need to cache expression
if (node.Expression is SetIdentifierNode)
{
return(Expr.SetMember(
node.Expression,
node.MemberName,
_assignmentOperator(
Expr.GetMember(
node.Expression,
node.MemberName
),
node.Value
)
));
}
// (x + y).name += value
// must cache (x + y) to a local variable to prevent double execution
var tmpVar = ctx.Scope.DeclareImplicit(ctx, node.Expression.Resolve(ctx), false);
return(Expr.Block(
Expr.Set(tmpVar, node.Expression),
Expr.SetMember(
Expr.Get(tmpVar),
node.MemberName,
_assignmentOperator(
Expr.GetMember(
Expr.Get(tmpVar),
node.MemberName
),
node.Value
)
)
));
}
/// <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);
}
}
protected bool Equals(SetMemberNode other)
{
return(base.Equals(other) && Equals(Value, other.Value));
}
protected bool Equals(SetMemberNode other)
{
return base.Equals(other) && Equals(Value, other.Value);
}
/// <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;
}
}
/// <summary>
/// Expands short assignment to an expression member:
/// (expr).x += 1
/// or type::x += 1
/// </summary>
private NodeBase expandMember(Context ctx, SetMemberNode node)
{
// type::name += value
if (node.StaticType != null)
{
return Expr.SetMember(
node.StaticType,
node.MemberName,
_AssignmentOperator(
Expr.GetMember(
node.StaticType,
node.MemberName
),
node.Value
)
);
}
// simple case: no need to cache expression
if (node.Expression is SetIdentifierNode)
{
return Expr.SetMember(
node.Expression,
node.MemberName,
_AssignmentOperator(
Expr.GetMember(
node.Expression,
node.MemberName
),
node.Value
)
);
}
// (x + y).name += value
// must cache (x + y) to a local variable to prevent double execution
var tmpVar = ctx.Scope.DeclareImplicit(ctx, node.Expression.Resolve(ctx), false);
return Expr.Block(
Expr.Set(tmpVar, node.Expression),
Expr.SetMember(
Expr.Get(tmpVar),
node.MemberName,
_AssignmentOperator(
Expr.GetMember(
Expr.Get(tmpVar),
node.MemberName
),
node.Value
)
)
);
}
