/// <summary>
/// Creates a variable expression with symbol scope, context, script refernce set.
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public static Expr Ident(string name, TokenData token)
{
var exp = new VariableExpr();
exp.Name = name;
SetupContext(exp, token);
return exp;
}
/// <summary>
/// Creates a variable expression with symbol scope, context, script refernce set.
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public static Expr IdentWith(TokenData token)
{
var exp = new VariableExpr();
exp.Name = _withStack.Peek();
SetupContext(exp, token);
return exp;
}
/// <summary>
/// Check that variable exists and that it is not used befor it is declared.
/// </summary>
/// <param name="semActs">The semantic analyser</param>
/// <param name="exp">The variable expression</param>
private SemanticCheckResult CheckVariable(SemActs semActs, VariableExpr exp)
{
if(!_currentSymScope.Contains(exp.Name))
return NodeError("Variable " + exp.Name + " does not exist", exp);
return SemanticCheckResult.Valid;
}
/// <summary>
/// Evaluate
/// </summary>
/// <returns></returns>
public object VisitVariable(VariableExpr expr)
{
// Case 1: memory variable has highest precendence
var name = expr.Name;
if (this.Ctx.Memory.Contains(name))
{
var val = this.Ctx.Memory.Get<object>(name);
return val;
}
// Case 2: check function now.
if (expr.SymScope.IsFunction(name))
{
}
throw ExceptionHelper.BuildRunTimeException(expr, "variable : " + name + " does not exist");
}
public object VisitVariable(VariableExpr expr)
{
return null;
}