public Binding Bind(string symbol, BindingRequestFlags options) {
var request = new BindingRequest(this, CurrentNode, symbol, options);
var binding = Bind(request);
if (binding == null)
ThrowScriptError("Unknown symbol '{0}'.", symbol);
return binding;
}
}//method
public virtual Binding BindSymbolForRead(BindingRequest request)
{
var symbol = request.Symbol;
// First check current and enclosing scopes
var currScope = request.Thread.CurrentScope;
do
{
var existingSlot = currScope.Info.GetSlot(symbol);
if (existingSlot != null)
return new SlotBinding(existingSlot, request.FromNode, request.FromScopeInfo);
currScope = currScope.Parent;
} while (currScope != null);
// If not found, check imports
foreach (var imp in request.FromModule.Imports)
{
var result = imp.Bind(request);
if (result != null)
return result;
}
// Check built-in modules
var builtIn = BuiltIns.Bind(request);
if (builtIn != null) return builtIn;
// if not found, return null
return null;
}
//IBindingSource Members
public Binding Bind(BindingRequest request)
{
IBindingSource target;
if (TryGetValue(request.Symbol, out target))
{
return(target.Bind(request));
}
return(null);
}
public Binding Bind(string symbol, BindingRequestFlags options)
{
var request = new BindingRequest(this, CurrentNode, symbol, options);
var binding = Bind(request);
if (binding == null)
{
ThrowScriptError("Unknown symbol '{0}'.", symbol);
}
return(binding);
}
public virtual Binding BindSymbolForWrite(BindingRequest request)
{
var scope = request.Thread.CurrentScope;
var existingSlot = scope.Info.GetSlot(request.Symbol);
//1. If new only, check it does not exist yet, create and return it
if (request.Flags.IsSet(BindingRequestFlags.NewOnly))
{
if (existingSlot != null)
{
request.Thread.ThrowScriptError("Variable {0} already exists.", request.Symbol);
}
var newSlot = scope.AddSlot(request.Symbol);
return(new SlotBinding(newSlot, request.FromNode, request.FromScopeInfo));
}
//2. If exists, then return it
if (existingSlot != null && request.Flags.IsSet(BindingRequestFlags.ExistingOrNew))
{
//TODO: For external client, check that slot is actually public or exported
return(new SlotBinding(existingSlot, request.FromNode, request.FromScopeInfo));
}
//3. Check external module imports
foreach (var imp in request.FromModule.Imports)
{
var result = imp.Bind(request);
if (result != null)
{
return(result);
}
}
//4. If nothing found, create new slot in current scope
if (request.Flags.IsSet(BindingRequestFlags.ExistingOrNew))
{
var newSlot = scope.AddSlot(request.Symbol);
return(new SlotBinding(newSlot, request.FromNode, request.FromScopeInfo));
}
//5. Check built-in methods
var builtIn = BuiltIns.Bind(request);
if (builtIn != null)
{
return(builtIn);
}
//6. If still not found, return null.
return(null);
}
//Binds to local variables, enclosing scopes, module scopes/globals and built-ins
public virtual Binding Bind(BindingRequest request) {
var symbol = request.Symbol;
var mode = request.Flags;
if (mode.IsSet(BindingRequestFlags.Write))
return BindSymbolForWrite(request);
else if (mode.IsSet(BindingRequestFlags.Read))
return BindSymbolForRead(request);
else {
//TODO: need to throw fatal error here
request.Thread.ThrowScriptError("Invalid binding request, access type (Read or Write) is not set in request Options.");
return null; // never happens
}
}//method
//Binds to local variables, enclosing scopes, module scopes/globals and built-ins
public virtual Binding Bind(BindingRequest request)
{
var mode = request.Flags;
if (mode.IsSet(BindingRequestFlags.Write))
{
return(BindSymbolForWrite(request));
}
else if (mode.IsSet(BindingRequestFlags.Read))
{
return(BindSymbolForRead(request));
}
else
{
//TODO: need to throw fatal error here
request.Thread.ThrowScriptError("Invalid binding request, access type (Read or Write) is not set in request Options.");
return(null); // never happens
}
}
}//method
public virtual Binding BindSymbolForWrite(BindingRequest request)
{
var scope = request.Thread.CurrentScope;
var existingSlot = scope.Info.GetSlot(request.Symbol);
//1. If new only, check it does not exist yet, create and return it
if (request.Flags.IsSet(BindingRequestFlags.NewOnly))
{
if (existingSlot != null)
request.Thread.ThrowScriptError("Variable {0} already exists.", request.Symbol);
var newSlot = scope.AddSlot(request.Symbol);
return new SlotBinding(newSlot, request.FromNode, request.FromScopeInfo);
}
//2. If exists, then return it
if (existingSlot != null && request.Flags.IsSet(BindingRequestFlags.ExistingOrNew))
{
//TODO: For external client, check that slot is actually public or exported
return new SlotBinding(existingSlot, request.FromNode, request.FromScopeInfo);
}
//3. Check external module imports
foreach (var imp in request.FromModule.Imports)
{
var result = imp.Bind(request);
if (result != null)
return result;
}
//4. If nothing found, create new slot in current scope
if (request.Flags.IsSet(BindingRequestFlags.ExistingOrNew))
{
var newSlot = scope.AddSlot(request.Symbol);
return new SlotBinding(newSlot, request.FromNode, request.FromScopeInfo);
}
//5. Check built-in methods
var builtIn = BuiltIns.Bind(request);
if (builtIn != null) return builtIn;
//6. If still not found, return null.
return null;
}//method
public virtual Binding BindSymbolForRead(BindingRequest request)
{
var symbol = request.Symbol;
// First check current and enclosing scopes
var currScope = request.Thread.CurrentScope;
do
{
var existingSlot = currScope.Info.GetSlot(symbol);
if (existingSlot != null)
{
return(new SlotBinding(existingSlot, request.FromNode, request.FromScopeInfo));
}
currScope = currScope.Parent;
} while (currScope != null);
// If not found, check imports
foreach (var imp in request.FromModule.Imports)
{
var result = imp.Bind(request);
if (result != null)
{
return(result);
}
}
// Check built-in modules
var builtIn = BuiltIns.Bind(request);
if (builtIn != null)
{
return(builtIn);
}
// if not found, return null
return(null);
}
public virtual Binding Bind(BindingRequest request) {
throw new NotImplementedException();
}
public Binding Bind(BindingRequest request)
{
return(null);
}
public override Binding Bind(BindingRequest request)
{
return(_binding);
}
//Implement IBindingSource.Bind
public Binding Bind(BindingRequest request)
{
return(BindingInstance);
}
public Binding Bind(BindingRequest request) {
return Binding;
}
//Used for imported modules
public Binding BindToExport(BindingRequest request)
{
return(null);
}
public Binding Bind(BindingRequest request)
{
return(Runtime.Bind(request));
}
public virtual Binding Bind(BindingRequest request)
{
throw new NotImplementedException();
}
public override Binding Bind(BindingRequest request) {
return _binding;
}
//Binds symbol to a public member exported by a module.
public virtual Binding BindSymbol(BindingRequest request, ModuleInfo module)
{
return module.BindToExport(request);
}
//Implement IBindingSource.Bind
public Binding Bind(BindingRequest request) {
return BindingInstance;
}
public Binding Bind(BindingRequest request) {
return null;
}
//Binds symbol to a public member exported by a module.
public virtual Binding BindSymbol(BindingRequest request, ModuleInfo module)
{
return(module.BindToExport(request));
}
public Binding Bind(BindingRequest request) {
return Runtime.Bind(request);
}
//IBindingSource Members
public Binding Bind(BindingRequest request)
{
return(TryGetValue(request.Symbol, out IBindingSource target) ? target.Bind(request) : null);
}