/// <summary>
/// Execute each expression.
/// </summary>
/// <returns></returns>
public object VisitFor(ForExpr expr)
{
expr.Start.Evaluate(this);
expr.DoContinueRunning = true;
expr.DoBreakLoop = false;
expr.DoContinueLoop = false;
var result = expr.Condition.Evaluate(this) as LObject;
expr.DoContinueRunning = EvalHelper.IsTrue(result);
while (expr.DoContinueRunning)
{
if (expr.Statements != null && expr.Statements.Count > 0)
{
foreach (var stmt in expr.Statements)
{
stmt.Evaluate(this);
this.Ctx.Limits.CheckLoop(expr);
// If Break statment executed.
if (expr.DoBreakLoop)
{
expr.DoContinueRunning = false;
break;
}
// Continue statement.
else if (expr.DoContinueLoop)
{
break;
}
}
}
else
{
break;
}
// Break loop here.
if (expr.DoContinueRunning == false)
{
break;
}
expr.Increment.Evaluate(this);
result = expr.Condition.Evaluate(this) as LObject;
expr.DoContinueRunning = EvalHelper.IsTrue(result);
}
return(LObjects.Null);
}
/// <summary>
/// Execute
/// </summary>
public object VisitIf(IfExpr expr)
{
// Case 1: If is true
var result = expr.Condition.Evaluate(this) as LObject;
bool execIf = EvalHelper.IsTrue(result);
object returnVal = LObjects.Null;
if (execIf)
{
if (expr.Statements != null && expr.Statements.Count > 0)
{
foreach (var stmt in expr.Statements)
{
returnVal = stmt.Evaluate(this);
}
}
}
// Case 2: Else available to execute
else if (expr.Else != null)
{
returnVal = expr.Else.Evaluate(this);
}
return(returnVal);
}