/// <summary>
/// Execute each expression.
/// </summary>
/// <returns></returns>
public object VisitForEach(ForEachExpr expr)
{
expr.DoContinueRunning = true;
expr.DoBreakLoop = false;
expr.DoContinueLoop = false;
// for(user in users)
// Push scope for var name
var source = expr.SourceExpr.Evaluate(this) as LObject;
// Check : 1. null object?
if (source == LObjects.Null)
return LObjects.Null;
IEnumerator enumerator = null;
if (source.Type == LTypes.Array) enumerator = ((IList)source.GetValue()).GetEnumerator();
else if (source.Type == LTypes.Map) enumerator = ((IDictionary)source.GetValue()).GetEnumerator();
else if (source.Type == LTypes.Table)
enumerator = ((IList) source.GetValue()).GetEnumerator();
expr.DoContinueRunning = enumerator.MoveNext();
while (expr.DoContinueRunning)
{
// Set the next value of "x" in for(x in y).
var current = enumerator.Current is LObject ? enumerator.Current : LangTypeHelper.ConvertToLangClass(enumerator.Current);
this.Ctx.Memory.SetValue(expr.VarName, current);
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;
// Increment.
expr.DoContinueRunning = enumerator.MoveNext();
}
return LObjects.Null;
}
/// <summary>
/// Creates a unary expression with symbol scope, context, script refernce set.
/// </summary>
/// <param name="varname"></param>
/// <param name="sourceExpr"></param>
/// <returns></returns>
public static Expr ForEach(string varname, Expr sourceExpr, TokenData token)
{
var exp = new ForEachExpr();
exp.VarName = varname;
exp.SourceExpr = sourceExpr;
SetupContext(exp, token);
return exp;
}
/// <summary>
/// Visits the for each statement tree.
/// </summary>
/// <param name="forExpr"></param>
public object VisitForEach(ForEachExpr expr)
{
_callBackOnNodeStart(expr);
expr.Condition.Visit(this);
foreach (var stmt in expr.Statements)
{
stmt.Visit(this);
}
return null;
}