private bool TryLookupType(string typeName, out TypeInfo typeInfo)
{
if (BuiltInPrimitives.TryGetValue(typeName, out typeInfo))
{
return(true);
}
return(userDefinedTypes.TryGetValue(typeName, out typeInfo));
}
private string EvaluateOperator(Operator op, string varName)
{
bool isSpecialVar = SpecialVariables.AllSpecialVariables.Contains(varName);
bool isLocalVar = TryLookupLocal(varName, out double localVarVal);
// Handle special variables
if (isSpecialVar)
{
if (op != Operator.ValueOf)
{
Log(LogLevel.Warning, "Operator {0} cannot be used on special variable '{1}'.", op, varName);
return("");
}
switch (varName)
{
case SpecialVariables.Filesize:
return(file.Length + "");
case SpecialVariables.GlobalOffset:
return(GlobalOffset + "");
case SpecialVariables.Offset:
return(CurrentCodeBlock.Offset + "");
}
}
// Handle local variables
if (isLocalVar)
{
if (op != Operator.ValueOf)
{
Log(LogLevel.Warning, "Operator {0} cannot be used on local variable '{1}'.", op, varName);
return("");
}
return(localVarVal + "");
}
bool isVar = CurrentCodeBlock.Symbol.TryLookup(varName, out SymbolTable sym);
bool isUserDefinedType = userDefinedTypes.TryGetValue(varName, out TypeInfo usrType);
bool isBuiltinType = BuiltInPrimitives.TryGetValue(varName, out TypeInfo builtinType);
if (!(isVar || isUserDefinedType || isBuiltinType))
{
// TODO: get statement. Perhaps throw a different exception and have Caller of ResolveVariables catch and handle it
string msg = "Unknown variable or typename '{0}'";
throw LayoutScriptException.Create <LayoutScriptException>(layout, null, msg, varName);
}
string val = "";
switch (op)
{
case Operator.GlobalOffsetOf:
if (CurrentCodeBlock.IsProcessingTypedef)
{
string msg = "GlobalOffsetOf operator not valid within type definitions.";
throw LayoutScriptException.Create <LayoutScriptException>(layout, null, msg, varName);
}
if (isVar)
{
val = sym.GlobalDataAddress.ToString();
}
else
{
string msg = "GlobalOffsetOf operator not valid for types.";
throw LayoutScriptException.Create <LayoutScriptException>(layout, null, msg, varName);
}
break;
case Operator.OffsetOf:
if (CurrentCodeBlock.IsProcessingTypedef)
{
string msg = "OffsetOf operator not valid within type definitions.";
throw LayoutScriptException.Create <LayoutScriptException>(layout, null, msg, varName);
}
if (isVar)
{
val = sym.LocalDataAddress.ToString();
}
else
{
string msg = "OffsetOf operator not valid for types.";
throw LayoutScriptException.Create <LayoutScriptException>(layout, null, msg, varName);
}
break;
case Operator.SizeOf:
if (isVar)
{
val = sym.DataLength.ToString();
}
else if (isBuiltinType)
{
val = builtinType.Size.ToString();
}
else if (isUserDefinedType)
{
val = usrType.Size.ToString();
}
break;
case Operator.ValueOf:
if (CurrentCodeBlock.IsProcessingTypedef)
{
string msg = "ValueOf operator not valid within type definitions.";
throw LayoutScriptException.Create <LayoutScriptException>(layout, null, msg, varName);
}
if (isVar)
{
val = StringValueOf(sym);
}
else
{
string msg = "ValueOf operator not valid for types.";
throw LayoutScriptException.Create <LayoutScriptException>(layout, null, msg, varName);
}
break;
}
return(val);
}