// We only need Lookup() during the resolve phase (because that's the only time
// we need to convert text into symbols)
// After that, we can just use the symbols directly
// Lookup an entry in a specific scope
// If it doesn't exist, then return null if !fMustExist and throw if fMustExist
public SymEntry LookupSymbol(Scope scope, Identifier id, bool fMustExist)
{
SymEntry s = scope.LookupSymbol(id.Text);
if (fMustExist && s == null)
{
ThrowError(SymbolError.UndefinedSymbol(id));
}
return s;
}
// Lookup a symbol in the current context.
// The context includes the lexical scope stack, super scopes,
// and using directives
// If it doesn't exist, then return null if !fMustExist and throw exception if fMustExist
public virtual SymEntry LookupSymbolWithContext(Identifier id, bool fMustExist)
{
string strName = id.Text;
// Search through stack of lexical scopes
SymEntry sym = null;
Scope t = m_CurrentContext;
while(t != null)
{
sym = LookupSymbol(t, id, false); // <-- smart lookup, go through ILookupController
if (sym != null)
return sym;
t = t.m_LexicalParent;
}
// Don't need this any more with ILookupControllers
#if false
// Check using directives if not found in the current scope stack
// Do this by traversing the scope stack and looking for UserNamespaceEntry
// (we can never be in an imported namespace, so that's ok)
t = m_CurrentContext;
while (t != null)
{
AST.NamespaceDecl node = t.Node as AST.NamespaceDecl;
if (node != null)
{
sym = node.LookupSymbolInUsingDirectives(this, id);
if (sym != null)
return sym;
}
t = t.m_LexicalParent;
}
#endif
// Symbol not found
if (fMustExist)
{
//ThrowError_UndefinedSymbol(id);
ThrowError(SymbolError.UndefinedSymbol(id));
}
return null;
}
// Get rid of this function
public SymEntry LookupSymbol(Scope scope, string st, bool fMustExist)
{
SymEntry s = scope.LookupSymbol(st);
bool f= false;
if (f) {
System.Xml.XmlWriter o = new System.Xml.XmlTextWriter(new System.IO.StreamWriter("dump.xml"));
scope.Dump(o, true);
o.Close();
}
if (fMustExist && s == null)
{
FileRange range = new FileRange();
range.Filename = "<not specified>";
Identifier id = new Identifier(st, range);
//ThrowError_UndefinedSymbol(id);
ThrowError(SymbolError.UndefinedSymbol(id));
}
return s;
}