public Binding BindSymbolForRead(BindingRequest request)
{
var symbol = request.Symbol;
var currScope = request.Thread.CurrentScope;
do
{
var existingSlot = currScope.ScopeInfo.GetSlot(symbol);
if (existingSlot != null)
{
return(new SlotBinding(existingSlot, request.FromNode, request.FromScopeInfo));
}
currScope = currScope.Parent;
} while (currScope != null);
if ((request.Flags & BindingRequestFlags.Extern) != 0)
{
var builtIn = BuiltIns.Bind(request);
if (builtIn != null)
{
return(builtIn);
}
}
if ((request.Flags & BindingRequestFlags.NullOk) != 0)
{
return(new NullBinding());
}
return(null);
}
public Binding Bind(BindingRequest request)
{
IBindingSource target;
if (TryGetValue(request.Symbol, out target))
{
return(target.Bind(request));
}
return(null);
}
public Binding BindSymbolForWrite(BindingRequest request)
{
var currScope = request.Thread.CurrentScope;
var symbol = request.Symbol;
var existingSlot = currScope.ScopeInfo.GetSlot(request.Symbol);
if ((request.Flags & BindingRequestFlags.ExistingOrNew) != 0)
{
if ((request.Flags & BindingRequestFlags.Existing) != 0)
{
var scope = currScope;
do
{
existingSlot = currScope.ScopeInfo.GetSlot(symbol);
if (existingSlot != null)
{
return(new SlotBinding(existingSlot, request.FromNode, request.FromScopeInfo));
}
currScope = currScope.Parent;
} while (currScope != null);
currScope = scope;
if ((request.Flags & BindingRequestFlags.Extern) != 0)
{
var builtIn = BuiltIns.Bind(request);
if (builtIn != null)
{
return(builtIn);
}
}
}
if ((request.Flags & BindingRequestFlags.NewOnly) != 0)
{
if (existingSlot != null)
{
ThrowScriptError("Var {0} is already defined!", symbol);
}
var newSlot = currScope.AddSlot(request.Symbol, request.Type);
return(new SlotBinding(newSlot, request.FromNode, request.FromScopeInfo));
}
}
return(null);
}
public Binding Bind(BindingRequest request)
{
var symbol = request.Symbol;
var mode = request.Flags;
if ((mode & BindingRequestFlags.Write) != 0)
{
return(BindSymbolForWrite(request));
}
else if ((mode & BindingRequestFlags.Read) != 0)
{
return(BindSymbolForRead(request));
}
else
{
request.Thread.ThrowScriptError("Invalid binding request!");
return(null);
}
}
public Binding Bind(BindingRequest request) => BindingInstance;
public Binding Bind(BindingRequest request)
{
throw new NotImplementedException();
}
