/** Inserts the specified name into this symbol table and returns the corresponding symbol. */
public Symbol Insert(string name, Definition definition)
{
#if TEST
if (name == null)
throw new System.ArgumentException("name");
#endif
Symbol symbol = new Symbol(definition, _stack.Peek());
try
{
_stack.Peek().InsertObject(name, symbol);
}
catch (Toolbox.VFS.Error)
{
throw new ParserError(definition.Cursor, "Symbol already exists: " + name);
}
return symbol;
}
public SymbolTable()
{
_stack.Push(_volume);
_world = new Symbol(null, _volume);
}
public void EnterBlock(string name, Definition definition)
{
#if TEST
if (name == null)
throw new System.ArgumentException("name");
if (definition == null)
throw new System.ArgumentException("definition");
#endif
// Handle re-visits to existing scopes.
Folder<Symbol> found = (Folder<Symbol>) _stack.Peek().Resolve(name);
if (found != null && found.Data.Definition == definition)
{
_stack.Push(found);
return;
}
// Create new folder and push it onto the stack of open folders.
Symbol symbol = new Symbol(definition);
symbol.Folder = _stack.Peek().InsertFolder(name, symbol);
_stack.Push(symbol.Folder);
}
public bool TryLookup(string name, out Symbol result)
{
Object<Symbol> @object = _stack.Peek().FindUpwards(name);
if (@object == null)
{
result = null;
return false;
}
result = (Symbol) @object.Data;
return true;
}