/// <summary>
/// Executes the statements and returns the result.
/// </summary>
/// <param name="statements">The statements to be executed.</param>
/// <returns>The execution result of <paramref name="statements"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="statements"/> is <see langword="null"/>, or contains <see langword="null"/>.</exception>
/// <exception cref="RuntimeException">An exception occurred during the execution of the statements.</exception>
public ExecuteResult ExecuteStatements(StatementCollection statements)
{
if (statements == null || statements.Contains(null))
{
throw new ArgumentNullException();
}
if (Labels == null)
{
Labels = new Dictionary <string, LabelStatement>();
}
HoistingExecuteStatements(statements);
ExecuteResult flow;
for (int i = 0; i < statements.Count; i++)
{
CancellationToken.ThrowIfCancellationRequested();
flow = ExecuteStatement(statements[i]);
label:
if (flow.FlowControl == FlowControl.Goto)
{
var go = (string)flow.Data;
if (Labels.ContainsKey(go))
{
i = statements.IndexOf(Labels[go]);
flow = ExecuteStatement(Labels[go]);
goto label;
}
else
{
return(flow);
}
}
else if (flow.FlowControl == FlowControl.Break ||
flow.FlowControl == FlowControl.Return ||
flow.FlowControl == FlowControl.Continue)
{
return(flow);
}
}
Labels.Clear();
return(ExecuteResult.Next);
}
