/// <summary>
///
/// </summary>
/// <param name="code"></param>
/// <returns></returns>
AttrAssignment CreateAttrAssignment(StringBuilder code)
{
int ix = code.ToString().IndexOf("=");
if (ix == -1)
{
throw new Exception("Invalid attr assignment:" + code);
}
string left = code.ToString().Substring(0, ix).Trim();
string right = code.ToString().Substring(ix + 1).Trim();
string[] toks = left.Split('.');
string obj = toks[0].Trim();
string attr = toks[1].Trim();
IIntResult lhs = ToIIntResult(obj);
IIntResult rhs = BuildExprTree(new StringBuilder(right));
//look up the lhs by name and set its value
// int objid = game.GetObjectId(obj);
// if (objid == -1)
// throw new Exception("game doesn't have an object named " + obj + " (in GetObjAttr)");
return(new AttrAssignment()
{
objName = obj,
attrName = attr,
Left = lhs,
Right = rhs
});
}
PropAssignment CreatePropAssignment(StringBuilder code)
{
int ix = code.ToString().IndexOf("=");
if (ix == -1)
{
throw new Exception("Invalid prop assignment:" + code);
}
string left = code.ToString().Substring(0, ix).Trim();
string right = code.ToString().Substring(ix + 1).Trim();
string[] toks = left.Split('.');
string obj = toks[0].Trim();
string attr = toks[1].Trim();
if (game.GetObjectId(obj) == -1 && !game.IsVariable(obj))
{
throw new Exception("game has no object or variable named " + obj);
}
IIntResult lhs = ToIIntResult(obj);
IIntResult rhs = BuildExprTree(new StringBuilder(right));
return(new PropAssignment()
{
objName = obj,
propName = attr,
Left = lhs,
Right = rhs
});
}
public PropAssignment(string name, string attr, IIntResult lhs, IIntResult rhs)
{
objName = name;
propName = attr;
Left = lhs;
Right = rhs;
}
public VarAssignment CreateVarAssignment(StringBuilder code)
{
string s = code.ToString().Trim();
string name = GetOperand(code);
if (!game.IsVariable(name))
{
throw new Exception(s + " is not a valid variable");
}
s = code.ToString().Trim();
if (s[0] != '=')
{
throw new Exception("expected = near " + s);
}
s = s.Substring(1).Trim();
// if (!Char.IsLetter(s[0]))
// throw new Exception("unexpected symbol near " + s);
IIntResult rhs = BuildExprTree(new StringBuilder(s));
VarAssignment v = new VarAssignment()
{
VarName = name,
Right = rhs
};
return(v);
}
public AttrAssignment(string obj, string attr, IIntResult lhs, IIntResult rhs)
{
objName = obj;
attrName = attr;
Left = lhs;
Right = rhs;
}
/// <summary>
/// Private method for building an integer
/// expression tree
/// </summary>
/// <param name="toks"></param>
/// <param name="minPrec"></param>
/// <returns></returns>
IIntResult PrecedenceClimb(List <string> toks, int minPrec)
{
IIntResult atom_lhs = FindAtom(toks);
BinaryOperator lhs = null;
while (toks.Count > 0 &&
IsBinaryOperator(toks.First()) &&
(ToBinaryOp(toks.First()).Precedence >= minPrec))
{
string optxt = toks.First();
toks.Pop(); //remove operator
BinaryOperator op = ToBinaryOp(optxt);
int prec = op.Precedence;
int next_min_prec = prec + 1;
//Console.WriteLine("operator=" + optxt);
IIntResult rhs = PrecedenceClimb(toks, next_min_prec);
op.Right = rhs;
if (lhs == null)
{
op.Left = atom_lhs;
}
else
{
op.Left = lhs;
}
lhs = op;
}
if (lhs == null)
{
return(atom_lhs);
}
return(lhs);
}
public Rand(IIntResult inner)
{ //get the inner code
upper = inner;
}
public PrintObjectName(IIntResult inner)
{
objectId = inner;
}
public AttributeRVal(string name, IIntResult lhs, string attr)
{
this.Left = lhs;
this.ObjName = name;
this.AttrName = attr;
}
public PropertyRVal(string name, IIntResult lhs, string property)
{
Left = lhs;
this.ObjName = name;
this.PropName = property;
}
