public void Define(Symbol sym, IScope currentScope)
{
if (TestForDefineErrors(sym, currentScope))
{
return;
}
currentScope.Define(sym);
}
public bool TestForDefineErrors(Symbol sym, IScope currentScope)
{
string location = string.Empty;
if (sym.Def != null)
location = "line " + sym.Def.Line + ":" + sym.Def.CharPositionInLine + " ";
if (currentScope.IsDefinedLocally(sym.Name))
{
_listener.Error(location + "Symbol '"
+ sym.Name + "' already defined"
);
return true;
}
if (currentScope.ScopeName == "local")
{
//if we're in a local scope, travel up until we hit a function def scope
//or an event def scope and make sure we're not shadowing any parameters
//if we are, issue a warning
if (FindSymbolInMethodScope(sym, currentScope) != null)
{
_listener.Info(location + "Symbol '"
+ sym.Name + "' shadows parameter of the same name"
);
}
}
return false;
}
public void Define(Symbol sym)
{
this.Members.Add(sym.Name, sym);
sym.Scope = this;
}
/// <summary>
/// Tries to find a matching symbol in the function parameter scope
/// </summary>
/// <param name="sym"></param>
/// <param name="localScope"></param>
/// <returns></returns>
private Symbol FindSymbolInMethodScope(Symbol sym, IScope localScope)
{
IScope searchScope = localScope;
while ((searchScope = searchScope.EnclosingScope) != null)
{
MethodSymbol methScope = searchScope as MethodSymbol;
if (methScope != null)
{
if (methScope.IsDefinedLocally(sym.Name))
{
return methScope.Resolve(sym.Name);
}
}
EventSymbol eventScope = searchScope as EventSymbol;
if (eventScope != null)
{
if (eventScope.IsDefinedLocally(sym.Name))
{
return eventScope.Resolve(sym.Name);
}
}
}
return null;
}
public void Define(Symbol sym)
{
_symbols.Add(sym.Name, sym);
sym.Scope = this;
}
