private void ParseAndAddGlobalVariableDefinition(Token variableType, Token variableName, FixedOffsetVariable importedVersion)
{
VerifyModifiersAgainstType(ModifierTargets.GlobalVariable);
FixedOffsetVariable newVariable = ProcessVariableDeclaration(variableType, _output.GlobalData, null, _state.NextTokenModifiers);
variableName.Define(TokenType.GlobalVariable, newVariable);
if (_source.NextIsKeyword(PredefinedSymbol.SetEqual))
{
// TODO: Check types to ensure this is valid
newVariable.DefaultValue = _source.ReadNextAsConstInt();
}
if (importedVersion != null)
{
if (importedVersion.CompareTo(newVariable) != 0)
{
throw new CompilerMessage(ErrorCode.NewDefinitionIsDifferent, "New definition of '" + variableName.Name + "' does not match previous one");
}
}
}
private FixedOffsetVariable ProcessVariableDeclaration(Token variableType, DataGroup container, Token parent, Modifiers modifiers)
{
FixedOffsetVariable newVariable;
int thisSize = 0;
if (variableType.Type == TokenType.StructType)
{
ScriptStruct childStruct = (ScriptStruct)variableType.Value;
if (childStruct.IsManaged)
{
thisSize = FixedOffsetVariable.POINTER_SIZE_IN_BYTES;
newVariable = new FixedOffsetVariable(variableType, container.SizeInBytes, true);
if ((childStruct != container) &&
(parent != null) &&
(childStruct.HasNonImportedMemberOfType(parent)))
{
throw new CompilerMessage(ErrorCode.CircularReference, "The type '" + childStruct.Name + "' has a reference to this struct, so you cannot also have a reference this way round");
}
}
else if (childStruct == container)
{
throw new CompilerMessage(ErrorCode.StructInsideItself, "A struct cannot be contained within itself");
}
else
{
thisSize = childStruct.SizeInBytes;
newVariable = new FixedOffsetVariable(variableType, container.SizeInBytes, thisSize);
}
}
else if (variableType is ScalarVariableTypeToken)
{
thisSize = ((ScalarVariableTypeToken)variableType).SizeInBytes;
newVariable = new FixedOffsetVariable(variableType, container.SizeInBytes, thisSize);
}
else if (variableType.Type == TokenType.EnumType)
{
thisSize = FixedOffsetVariable.ENUM_SIZE_IN_BYTES;
newVariable = new FixedOffsetVariable(variableType, container.SizeInBytes, thisSize);
}
else
{
throw new CompilerMessage(ErrorCode.CannotUseTypeInStruct, "Cannot add variable of type '" + variableType.Name + "' to struct");
}
newVariable.IsAttributeProperty = modifiers.HasModifier(Modifiers.ATTRIBUTE);
newVariable.IsImported = modifiers.HasModifier(Modifiers.IMPORT);
if ((newVariable.IsAttributeProperty) &&
(!newVariable.IsImported))
{
throw new CompilerMessage(ErrorCode.AttributesMustBeImported, "Attribute types must be imported");
}
if ((newVariable.IsImported) &&
(!newVariable.IsAttributeProperty) &&
(parent != null))
{
throw new CompilerMessage(ErrorCode.InvalidUseOfKeyword, "'import' is invalid in this context");
}
if (newVariable.IsImported)
{
// No memory needed for imported vars
newVariable.Offset = 0;
thisSize = 0;
}
container.Members.Add(newVariable);
container.SizeInBytes += thisSize;
return newVariable;
}
