private IEnumerable <object> Condition(LoopedSourceReader reader, IExecutionScope scope, bool skipExec)
{
var exec = DefaultLanguageNodes.Operation.Execute(reader, scope, skipExec);
object lastValue = null;
foreach (var o in exec)
{
lastValue = o;
yield return(o);
}
reader.Reset();
if (lastValue is bool == false)
{
throw new OperationException(reader, "While condition is not bool");
}
yield return((bool)lastValue);
}
private IEnumerator <object> Exec(ISourceReader reader, IExecutionScope scope, bool skipExec)
{
if (!IsStartOfNode(reader.LastKeyword, scope))
{
throw new SyntaxException(reader, "Loop section should start with loop keyword");
}
reader.ReadNext();
var loopScope = scope.MakeSubScope();
var declarationexec = DefaultLanguageNodes.LoopDeclaration.Execute(reader, loopScope, skipExec);
object lastValue = null;
foreach (var o in declarationexec)
{
lastValue = o;
if (o is LoopCondition == false)
{
yield return(o);
}
}
if (lastValue is LoopCondition == false)
{
throw new OperationException(reader, "No condition generated for loop");
}
var condition = lastValue as LoopCondition;
var loopedReader = new LoopedSourceReader(reader);
loopedReader.ForgetFirst();
var first = true;
while (true)
{
var condexec = condition();
lastValue = null;
foreach (var o in condexec)
{
lastValue = o;
if (!skipExec)
{
yield return(o);
}
}
if (first)
{
loopedReader.AddSnapshot();
first = false;
}
if (lastValue is bool == false)
{
throw new OperationException(loopedReader, "Invalid returned value by condition");
}
var doLoop = (bool)lastValue;
if (!doLoop)
{
break;
}
var exec = DefaultLanguageNodes.Statement.Execute(loopedReader, loopScope, skipExec);
foreach (var o in exec)
{
if (!skipExec)
{
yield return(o);
}
}
loopedReader.Reset();
}
}