/// <summary>
///
/// </summary>
/// <param name="parser"></param>
/// <param name="var"></param>
/// <param name="component"></param>
/// <returns>Returns a register index.</returns>
private int ParseTerm(idScriptParser parser, idWindowVariable var, int component)
{
int a, b;
object tmp;
idToken token = parser.ReadToken();
string tokenValue = token.ToString().ToLower();
if(tokenValue == "(")
{
a = ParseExpression(parser);
parser.ExpectTokenString(")");
return a;
}
else if(tokenValue == "time")
{
return (int) WindowExpressionRegister.Time;
}
// parse negative numbers
else if(tokenValue == "-")
{
token = parser.ReadToken();
if((token.Type == TokenType.Number) || (token.ToString() == "."))
{
return ExpressionConstant(-token.ToFloat());
}
parser.Warning("Bad negative number '{0}'", token.ToString());
return 0;
}
if((token.Type == TokenType.Number) || (token.ToString() == ".") || (token.ToString() == "-"))
{
return ExpressionConstant(token.ToFloat());
}
// see if it is a table name
idDeclTable table = idE.DeclManager.FindType<idDeclTable>(DeclType.Table, token.ToString(), false);
if(table != null)
{
a = table.Index;
// parse a table expression
parser.ExpectTokenString("[");
b = ParseExpression(parser);
parser.ExpectTokenString("]");
return EmitOperation(a, b, WindowExpressionOperationType.Table);
}
if(var == null)
{
var = GetVariableByName(token.ToString(), true);
}
if(var != null)
{
var.Init(tokenValue, this);
tmp = var;
b = component;
if(var is idWinVector4)
{
if((token = parser.ReadToken()) != null)
{
if(token.ToString() == "[")
{
b = ParseExpression(parser);
parser.ExpectTokenString("]");
}
else
{
parser.UnreadToken(token);
}
}
return EmitOperation(tmp, b, WindowExpressionOperationType.Var);
}
else if(var is idWinFloat)
{
return EmitOperation(tmp, b, WindowExpressionOperationType.VarF);
}
else if(var is idWinInteger)
{
return EmitOperation(tmp, b, WindowExpressionOperationType.VarI);
}
else if(var is idWinBool)
{
return EmitOperation(tmp, b, WindowExpressionOperationType.VarB);
}
else if(var is idWinString)
{
return EmitOperation(tmp, b, WindowExpressionOperationType.VarS);
}
else
{
parser.Warning("Variable expression not vec4, float or int '{0}'", token.ToString());
}
return 0;
}
else
{
// ugly but used for post parsing to fixup named vars
EmitOperation(token.ToString(), -2, WindowExpressionOperationType.Var);
}
return 0;
}
