// An ObjExp is just a temporary node. But that's the best a Context-Free parse can
// do. So now that we're building a symbol table, we can do a Context-Sensitive resolution
// and figure out what type of node this really is.
public Exp GetResolvedNode(ISemanticResolver s, bool fRight)
{
Exp eResolved = null;
// Lookup the symbol and determine what we are
//SymEntry sym = s.LookupSymbol(this.m_strId, true);
string stName = this.m_strId.Text;
SymEntry sym = s.LookupSymbolWithContext(this.m_strId, false); // allow methods
// Namespace
if (sym is NamespaceEntry)
{
eResolved = new NamespaceExp(sym as NamespaceEntry);
}
// Local Variable
else if (sym is LocalVarExpEntry)
{
eResolved = new LocalExp(sym as LocalVarExpEntry);
}
// Parameter
else if (sym is ParamVarExpEntry)
{
eResolved = new ParamExp(sym as ParamVarExpEntry);
}
// A type name
else if (sym is TypeEntry)
{
eResolved = new TypeExp(sym as TypeEntry);
}
// A field (w/ an implied 'this' pointer)
else if (sym is FieldExpEntry)
{
// When a single identifier resolves to a field, it can be either
// an instance field with an implied 'this' ref, or a static field of this class.
FieldExpEntry f = sym as FieldExpEntry;
Exp expInstance = null;
if (!f.IsStatic)
{
expInstance = new SimpleObjExp("this");
Exp.ResolveExpAsRight(ref expInstance, s);
}
eResolved = new FieldExp(f, expInstance);
}
// An event (w/ an implied 'this' ptr)
else if (sym is EventExpEntry)
{
EventExpEntry e = (EventExpEntry) sym;
Exp expInstance = null;
if (!e.Mods.IsStatic)
{
expInstance = new SimpleObjExp("this");
Exp.ResolveExpAsRight(ref expInstance, s);
}
eResolved = new EventExp(e, expInstance);
}
// A property (w/ an implied 'this' ptr).
// Properties will eventually be converted into method calls.
else if (sym is PropertyExpEntry)
{
PropertyExpEntry p = (PropertyExpEntry) sym;
Exp expInstance = null;
if (!p.IsStatic)
{
expInstance = new SimpleObjExp("this");
Exp.ResolveExpAsRight(ref expInstance, s);
}
eResolved = new PropertyExp(p, expInstance);
}
// Not recognized.
else {
if (stName == "this") // check a common error case...
Debug.Assert(false, "Can't access 'this'. Are we in a static?");
if (sym == null)
{
MethodHeaderEntry h = s.GetCurrentClass().LookupMethodHeader(this.m_strId.Text);
if (h != null)
{
return this;
}
ThrowError(SymbolError.UndefinedSymbol(m_strId));
//Debug.Assert(false, "Unknown name in SimpleObjExp:" + stName);
}
Debug.Assert(false, "Unknown symbol type:" + ((sym == null) ? "null" : sym.ToString()));
}
Debug.Assert(eResolved != null);
return eResolved;
}
// An ObjExp is just a temporary node. But that's the best a Context-Free parse can
// do. So now that we're building a symbol table, we can do a Context-Sensitive resolution
// and figure out what type of node this really is.
public Exp GetResolvedNode(ISemanticResolver s)
{
string stText = this.m_strId.Text;
// Left must already be resolved, then we resolve right in the context of left
Debug.Assert(m_left != null);
Exp eResolved = null;
// @todo, what if left is a NullExp?
if (m_left is NamespaceExp)
{
// We're either a nested namespace or a class
NamespaceEntry n = (m_left as NamespaceExp).Symbol;
SymEntry sym = n.ChildScope.LookupSymbol(stText);
if (sym is NamespaceEntry)
{
eResolved = new NamespaceExp(sym as NamespaceEntry);
}
else if (sym is TypeEntry)
{
eResolved = new TypeExp(sym as TypeEntry);
} else {
//ThrowError_UndefinedSymbolInNamespace(s, n, m_strId);
ThrowError(SymbolError.UndefinedSymbolInNamespace(n, m_strId));
}
}
// Check for statics
else if (m_left is TypeExp)
{
TypeEntry t = ((TypeExp) m_left).Symbol;
t.EnsureResolved(s);
SymEntry sym = t.MemberScope.LookupSymbol(stText);
if (sym is FieldExpEntry)
{
Debug.Assert(((FieldExpEntry) sym).IsStatic);
eResolved = new FieldExp(sym as FieldExpEntry, null); // static
}
else if (sym is PropertyExpEntry)
{
eResolved = new PropertyExp(sym as PropertyExpEntry, null);
}
else if (sym is EventExpEntry)
{
eResolved = new EventExp(sym as EventExpEntry, null);
}
// Allow nested types
else if (sym is TypeEntry)
{
eResolved = new TypeExp(sym as TypeEntry);
}
else
{
// Must be a method. The node transform occurs higher up though.
Debug.Assert((sym = t.LookupMethodHeader(stText)) != null);
eResolved = this;
}
if (eResolved == null) {
//ThrowError_UndefinedSymbolInType(s, t, m_strId);
ThrowError(SymbolError.UndefinedSymbolInType(t, m_strId));
}
}
// m_left is a variable, and we're doing an instance member dereference
else {
TypeEntry t = null;
t = s.ResolveCLRTypeToBlueType(this.m_left.CLRType);
t.EnsureResolved(s);
Scope scope = t.MemberScope;
// @todo - broken for an interface. IA : IB, scope for IA doesn't link to IB.
SymEntry sym = scope.LookupSymbol(stText);
if (sym is FieldExpEntry)
{
eResolved = new FieldExp(sym as FieldExpEntry, this.m_left);
}
else if (sym is PropertyExpEntry)
{
eResolved = new PropertyExp(sym as PropertyExpEntry, this.m_left);
}
else if (sym is EventExpEntry)
{
eResolved = new EventExp(sym as EventExpEntry, this.m_left);
}
else
{
// Must be a method. The node transform occurs higher up though.
sym = t.LookupMethodHeader(stText);
if (sym != null)
eResolved = this;
}
if (eResolved == null)
{
ThrowError(SymbolError.UndefinedSymbolInType(t, m_strId));
}
}
Debug.Assert(eResolved != null);
return eResolved;
}
// See section 10.7 of the C# spec.
// Outside of our class, we can only use an event as the LS in += and -=
// However, within our class, we can use an event on the RS, like a delegate.
// This is a little goofy.
// We can actually never use an event on the RS. When try to, we're actually
// using a compiler generated delegate (that has the exact same name) instead.
// However, we can't put both an event & a delegate in the same scope (because
// the names would conflict). So the delegate has a different name than the event.
// When the user tries to access an event as a RHS, we switch it to the delegate here.
protected override Exp ResolveExpAsRight(ISemanticResolver s)
{
FieldExpEntry f = m_symbol.Field;
if (f == null)
{
// Events aren't allowed as RHS expressions.
ThrowError(SymbolError.NoEventOnRHS(this));
}
Exp e = new FieldExp(f, this.InstanceExp);
Exp.ResolveExpAsRight(ref e, s);
return e;
}